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University of Central Florida
1.
Mandridis, Dimitrios.
Low Noise And Low Repetition Rate Semiconductor-based Mode-locked Lasers.
Degree: 2011, University of Central Florida
URL: https://stars.library.ucf.edu/etd/1867 
► The topic of this dissertation is the development of low repetition rate and low noise semiconductor-based laser sources with a focus on linearly chirped pulse…
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▼ The topic of this dissertation is the development of low repetition rate and low noise semiconductor-based laser sources with a focus on linearly chirped pulse laser sources. In the past decade chirped optical pulses have found a plethora of applications such as photonic analogto-digital conversion, optical coherence tomography, laser ranging, etc. This dissertation analyzes the aforementioned applications of linearly chirped pulses and their technical requirements, as well as the performance of previously demonstrated chirped pulse laser sources. Moreover, the focus is shifted to a specific application of the linearly chirped pulses, timestretched photonic analog-to-digital conversion (TS ADC). The challenges of surpassing the speeds of current electronic converters are discussed, while the need for low noise linearly chirped pulse lasers becomes apparent for the realization of TS ADC. The experimental research addresses the topic of low noise chirped pulse generation in three distinct ways. First, a chirped pulse (Theta) laser with an intra-cavity Fabry-Pérot etalon and a long-term referencing mechanism is developed that results in the reduction of the pulse-topulse energy noise. Noise suppression of >15 times is demonstrated. Moreover, an optical frequency comb with spacing equal to the repetition rate (≈100 MHz) is generated using the etalon, resulting in the first reported demonstration of a system operating in the sub-GHz regime based on semiconductor gain. The path for the development of the Theta laser was laid by the precise characterization of the etalon used in this laser cavity design. A narrow linewidth laser is used in conjunction with an acousto-optic modulator externally swept for measuring the etalon’s iv free spectral range with a sub-Hz precision, or 10 parts per billion. Furthermore, the measurement of the etalon long-term drift and birefringence lead to the development of a modified intra-cavity Hänsch-Couillaud locking mechanism for the Theta laser. Moreover, an external feed-forward system was demonstrated that aimed at increasing the temporal/spectral uniformity of the optical pulses. A complete characterization of the system is demonstrated. On a different series of experiments, the pulses emitted by an ultra-low noise but high repetition rate mode-locked laser were demultiplexed resulting in a low repetition rate pulse train. Experimental investigation of the noise properties of the laser proved that they are preserved during the demultiplexing process. The noise of the electrical gate used in this experiment is also investigated which led into the development of a more profound understanding of the electrical noise of periodical pulses and a mechanism of measuring their noise. The appendices in this dissertation provide additional material used for the realization of the main research focus of the dissertation. Measurements of the group delay of the etalon used in the Theta laser are presented in order to demonstrate the limiting factors for the development of this cavity design. The…
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Mode locked lasers; Semiconductor lasers; Electromagnetics and Photonics; Optics; Dissertations, Academic – Optics and Photonics, Optics and Photonics – Dissertations, Academic
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APA (6th Edition):
Mandridis, D. (2011). Low Noise And Low Repetition Rate Semiconductor-based Mode-locked Lasers. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/1867
Chicago Manual of Style (16th Edition):
Mandridis, Dimitrios. “Low Noise And Low Repetition Rate Semiconductor-based Mode-locked Lasers.” 2011. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/1867.
MLA Handbook (7th Edition):
Mandridis, Dimitrios. “Low Noise And Low Repetition Rate Semiconductor-based Mode-locked Lasers.” 2011. Web. 18 Apr 2021.
Vancouver:
Mandridis D. Low Noise And Low Repetition Rate Semiconductor-based Mode-locked Lasers. [Internet] [Doctoral dissertation]. University of Central Florida; 2011. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/1867.
Council of Science Editors:
Mandridis D. Low Noise And Low Repetition Rate Semiconductor-based Mode-locked Lasers. [Doctoral Dissertation]. University of Central Florida; 2011. Available from: https://stars.library.ucf.edu/etd/1867
University of Central Florida
2.
Ozdur, Ibrahim Tuna.
Low Noise, Narrow Optical Linewidth Semiconductor-based Optical Comb Source And Low Noise Rf Signal Generation.
Degree: 2011, University of Central Florida
URL: https://stars.library.ucf.edu/etd/1946
► Recently optical frequency combs and low noise RF tones are drawing increased attention due to applications in spectroscopy, metrology, arbitrary waveform generation, optical signal processing…
(more)
▼ Recently optical frequency combs and low noise RF tones are drawing increased attention due to applications in spectroscopy, metrology, arbitrary waveform generation, optical signal processing etc. This thesis focuses on the generation of low noise RF tones and stabilized optical frequency combs. The optical frequency combs are generated by a semiconductor based external cavity mode-locked laser with a high finesse intracavity etalon. In order to get the lowest noise and broadest bandwidth from the mode-locked laser, it is critical to know the free spectral range (FSR) of the etalon precisely. First the etalon FSR is measured by using the modified Pound-Drever-Hall (PDH) based method and obtained a resolution of 1 part in 106 , which is 2 order of magnitude better than the standard PDH based method. After optimizing the cavity length, RF driving frequency and PDH cavity locking point, the mode-locked laser had an integrated timing jitter of 3 fs (1 Hz- 100 MHz) which is, to the best of our knowledge, the lowest jitter ever reported from a semiconductor based multigigahertz comb source. The modelocked laser produces ~ 100 comb lines with 10 GHz spacing, a linewidth of ~500 Hz and 75 dB optical signal-to-noise ratio. The same system can also be driven as a regeneratively modelocked laser with greatly improved noise performance. Another way of generating a low noise RF tone is using an opto-electronic oscillator which uses an optical cavity as a high Q element. Due to the harmonic nature of OEOs, a mode selection element is necessary. Standard OEOs use an RF filter having drawbacks such as broad pass band, high loss, and high thermal noise. In our work, a novel optoelectronic scheme which uses an optical filter (Fabry-Perot etalon) as the mode filter instead of an RF filter is demonstrated. This method has the advantage of having ultra-narrow filtering bandwidths ( ~ 10 iv kHz for a 10 GHz FSR and 106 finesse) and an extremely low noise RF signal. Experimental demonstration of the proposed method resulted in a 5-10 dB decrease of the OEO noise compared to the conventional OEO setup. Also, by modifying the etalon-based OEO, and using single side band modulation, an optically tunable optoelectronic oscillator is achieved with 10-20 dB lower noise than dual side band modulation. Noise properties of the OEO as a function of optical frequency detuning is also analyzed theoretically and the results are in agreement with experimental results. The thesis concludes with comments on future work and directions.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Mode locked lasers; Radio frequency; Electromagnetics and Photonics; Optics; Dissertations, Academic – Optics and Photonics, Optics and Photonics – Dissertations, Academic
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APA (6th Edition):
Ozdur, I. T. (2011). Low Noise, Narrow Optical Linewidth Semiconductor-based Optical Comb Source And Low Noise Rf Signal Generation. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/1946
Chicago Manual of Style (16th Edition):
Ozdur, Ibrahim Tuna. “Low Noise, Narrow Optical Linewidth Semiconductor-based Optical Comb Source And Low Noise Rf Signal Generation.” 2011. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/1946.
MLA Handbook (7th Edition):
Ozdur, Ibrahim Tuna. “Low Noise, Narrow Optical Linewidth Semiconductor-based Optical Comb Source And Low Noise Rf Signal Generation.” 2011. Web. 18 Apr 2021.
Vancouver:
Ozdur IT. Low Noise, Narrow Optical Linewidth Semiconductor-based Optical Comb Source And Low Noise Rf Signal Generation. [Internet] [Doctoral dissertation]. University of Central Florida; 2011. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/1946.
Council of Science Editors:
Ozdur IT. Low Noise, Narrow Optical Linewidth Semiconductor-based Optical Comb Source And Low Noise Rf Signal Generation. [Doctoral Dissertation]. University of Central Florida; 2011. Available from: https://stars.library.ucf.edu/etd/1946
University of Central Florida
3.
Bagnell, Marcus.
Photonic Filtering for Applications in Microwave Generation and Metrology.
Degree: 2014, University of Central Florida
URL: https://stars.library.ucf.edu/etd/4778
► This work uses the photonic filtering properties of Fabry-Perot etalons to show improvements in the electrical signals created upon photodetection of the optical signal. First,…
(more)
▼ This work uses the photonic filtering properties of Fabry-Perot etalons to show improvements in the electrical signals created upon photodetection of the optical signal. First, a method of delay measurement is described which uses multi-heterodyne detection to find correlations in white light signals at 20 km of delay to sub millimeter resolution. By filtering incoming white light with a Fabry-Perot etalon, the pseudo periodic signal is suitable for measurement by combining and photodetecting it with an optical frequency comb. In this way, optical data from a large bandwidth can be downconverted and sampled on low frequency electronics. Second, a high finesse etalon is used as a photonic filter inside an optoelectronic oscillator (OEO). The etalon's narrow filter function allows the OEO loop length to be extremely long for a high oscillator quality factor while still suppressing unwanted modes below the noise floor. The periodic nature of the etalon allows it to be used to generate a wide range of microwave and millimeter wave tones without degradation of the RF signal.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Microwave oscillators; multi heterodyne detection; millimeter wave generation; Electromagnetics and Photonics; Optics; Dissertations, Academic – Optics and Photonics; Optics and Photonics – Dissertations, Academic
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APA (6th Edition):
Bagnell, M. (2014). Photonic Filtering for Applications in Microwave Generation and Metrology. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/4778
Chicago Manual of Style (16th Edition):
Bagnell, Marcus. “Photonic Filtering for Applications in Microwave Generation and Metrology.” 2014. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/4778.
MLA Handbook (7th Edition):
Bagnell, Marcus. “Photonic Filtering for Applications in Microwave Generation and Metrology.” 2014. Web. 18 Apr 2021.
Vancouver:
Bagnell M. Photonic Filtering for Applications in Microwave Generation and Metrology. [Internet] [Doctoral dissertation]. University of Central Florida; 2014. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/4778.
Council of Science Editors:
Bagnell M. Photonic Filtering for Applications in Microwave Generation and Metrology. [Doctoral Dissertation]. University of Central Florida; 2014. Available from: https://stars.library.ucf.edu/etd/4778
University of Central Florida
4.
Klee, Anthony.
Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers.
Degree: 2016, University of Central Florida
URL: https://stars.library.ucf.edu/etd/4925
► Mode-locked lasers have numerous applications in the areas of communications, spectroscopy, and frequency metrology. Harmonically mode-locked semiconductor lasers with external ring cavities offer a unique…
(more)
▼ Mode-locked lasers have numerous applications in the areas of communications, spectroscopy, and frequency metrology. Harmonically mode-locked semiconductor lasers with external ring cavities offer a unique combination of benefits in that they can produce high repetition rate pulse trains with low timing jitter, achieve narrow axial mode linewidths, have the potential for entire monolithic integration on-chip, feature high wall-plug efficiency due to direct electrical pumping, and can be engineered to operate in different wavelength bands of interest. However, lasers based on InP/InGaAsP quantum well devices which operate in the important telecom C-band have thus far been relatively limited in bandwidth as compared to competing platforms. Broad bandwidth is critical for increasing information carrying capacity and enabling femtosecond pulse production for coherent continuum generation in offset frequency stabilization. The goal of the work in this dissertation is to maximize the bandwidth of semiconductor lasers, bringing them closer to reaching their full potential as all-purpose sources.
Dispersion in the laser cavity is a primary limiter of the achievable bandwidth in the laser architectures covered in this dissertation. In the first part of this dissertation, an accurate self-referenced technique based on multi-heterodyne detection is developed for measuring the spectral phase of a mode-locked laser. This technique is used to characterize the dispersion in several semiconductor laser architectures. In the second part, this knowledge is applied to reduce the dispersion in a laser cavity using a programmable pulse shaper, and thus increase the laser's spectral bandwidth. We demonstrate a 10 GHz frequency comb with bandwidth spanning 5 THz, representing a twofold improvement over the previously achievable bandwidth. Finally, this laser is converted to a stand-alone system by reconfiguring it as a coupled opto-electronic oscillator and a novel stabilization scheme is presented.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Electromagnetics and Photonics; Optics
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APA (6th Edition):
Klee, A. (2016). Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/4925
Chicago Manual of Style (16th Edition):
Klee, Anthony. “Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers.” 2016. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/4925.
MLA Handbook (7th Edition):
Klee, Anthony. “Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers.” 2016. Web. 18 Apr 2021.
Vancouver:
Klee A. Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers. [Internet] [Doctoral dissertation]. University of Central Florida; 2016. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/4925.
Council of Science Editors:
Klee A. Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers. [Doctoral Dissertation]. University of Central Florida; 2016. Available from: https://stars.library.ucf.edu/etd/4925
University of Central Florida
5.
Sarailou, Edris.
True linearized intensity modulation for photonic analog to digital conversion using an injection-locked mode-locked laser.
Degree: 2015, University of Central Florida
URL: https://stars.library.ucf.edu/etd/1175
► A true linearized interferometric intensity modulator for pulsed light has been proposed and experimentally presented in this thesis. This has been achieved by introducing a…
(more)
▼ A true linearized interferometric intensity modulator for pulsed light has been proposed and experimentally presented in this thesis. This has been achieved by introducing a mode-locked laser into one of the arms of a Mach-Zehnder interferometer and injection-locking it to the input light (which is pulsed and periodic). By modulating the injection-locked laser, and combining its output light with the light from the other arm of interferometer in quadrature, one can achieve true linearized intensity modulator. This linearity comes from the arcsine phase response of the injection-locked mode-locked laser (as suggested by steady-state solution of Adler's equation) when it is being modulated.
Mode-locked lasers are fabricated using a novel AlGaInAs-InP material system. By using the BCB for planarization and minimizing the metal pad size and directly modulating the laser, we have achieved very effective fundamental hybrid mode-locking at the repetition rate of ~ 23 GHz. This laser also provided the short pulses of 860 fs and 280 fs timing jitter integrated from 1 Hz- 100 MHz.
The linearized intensity modulator has been built by using two identical two-section mode-locked lasers with the same length, one as the slave laser in one of the arms of the Mach-Zehnder interferometer injection-locked to the other one as the master which is the input light to the modulator. A low V? of 8.5 mV is achieved from this modulator. Also the current of the gain section or the voltage of the saturable absorber section of the slave laser has been used to apply the modulation signal. A spur free dynamic range of 70 dB.Hz2/3 is achieved when modulating the modulator through the saturable absorber. Modulating the saturable absorber provides a reduced third-order intermodulation tone with respect to modulating the gain. This is simply because of the unwanted amplitude modulation created when modulating the gain section current.
Finally an improved design is proposed and demonstrated to improve the modulator performance. This is achieved by introducing a third section to the laser. Using the impurity free vacancy disordering technique the photoluminescence peak of this section is blue-shifted selectively and therefore there would not be any absorption in that passive section. By applying the modulation signal to this passive section rather than applying it to the gain section or saturable absorber section, the amplitude and phase modulation could be decoupled. The experimental results have presented here and an almost six-fold reduction in V? and 5 dB improvement in spur free dynamic range have been achieved. The proposed and demonstrated configuration as an analog optical link has the potential to increase the performance and resolution of photonic analog-to-digital converters.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Linear modulators; injection locked lasers; semiconductors mode locked lasers; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Sarailou, E. (2015). True linearized intensity modulation for photonic analog to digital conversion using an injection-locked mode-locked laser. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/1175
Chicago Manual of Style (16th Edition):
Sarailou, Edris. “True linearized intensity modulation for photonic analog to digital conversion using an injection-locked mode-locked laser.” 2015. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/1175.
MLA Handbook (7th Edition):
Sarailou, Edris. “True linearized intensity modulation for photonic analog to digital conversion using an injection-locked mode-locked laser.” 2015. Web. 18 Apr 2021.
Vancouver:
Sarailou E. True linearized intensity modulation for photonic analog to digital conversion using an injection-locked mode-locked laser. [Internet] [Doctoral dissertation]. University of Central Florida; 2015. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/1175.
Council of Science Editors:
Sarailou E. True linearized intensity modulation for photonic analog to digital conversion using an injection-locked mode-locked laser. [Doctoral Dissertation]. University of Central Florida; 2015. Available from: https://stars.library.ucf.edu/etd/1175
University of Central Florida
6.
Davila-Rodriguez, Josue.
External Cavity Mode-locked Semiconductor Lasers For The Generation Of Ultra-low Noise Multi-gigahertz Frequency Combs And Applications In Multi-heterodyne Detection Of Arbitrary Optical Waveforms.
Degree: 2013, University of Central Florida
URL: https://stars.library.ucf.edu/etd/2526
► The construction and characterization of ultra-low noise semiconductor-based mode-locked lasers as frequency comb sources with multi-gigahertz combline-to-combline spacing is studied in this dissertation. Several different…
(more)
▼ The construction and characterization of ultra-low noise semiconductor-based mode-locked lasers as frequency comb sources with multi-gigahertz combline-to-combline spacing is studied in this dissertation. Several different systems were built and characterized. The first of these systems includes a novel mode-locking mechanism based on phase modulation and periodic spectral filtering. This mode-locked laser design uses the same intra-cavity elements for both mode-locking and frequency stabilization to an intra-cavity, 1,000 Finesse, Fabry-Pérot Etalon (FPE). On a separate effort, a mode-locked laser based on a Slab-Coupled Optical Waveguide Amplifier (SCOWA) was built. This system generates a pulse-train with residual timing jitter of
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Lasers; mode locked lasers; frequency combs; optical metrology; Electromagnetics and Photonics; Optics; Dissertations, Academic – Optics and Photonics, Optics and Photonics – Dissertations, Academic
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APA (6th Edition):
Davila-Rodriguez, J. (2013). External Cavity Mode-locked Semiconductor Lasers For The Generation Of Ultra-low Noise Multi-gigahertz Frequency Combs And Applications In Multi-heterodyne Detection Of Arbitrary Optical Waveforms. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/2526
Chicago Manual of Style (16th Edition):
Davila-Rodriguez, Josue. “External Cavity Mode-locked Semiconductor Lasers For The Generation Of Ultra-low Noise Multi-gigahertz Frequency Combs And Applications In Multi-heterodyne Detection Of Arbitrary Optical Waveforms.” 2013. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/2526.
MLA Handbook (7th Edition):
Davila-Rodriguez, Josue. “External Cavity Mode-locked Semiconductor Lasers For The Generation Of Ultra-low Noise Multi-gigahertz Frequency Combs And Applications In Multi-heterodyne Detection Of Arbitrary Optical Waveforms.” 2013. Web. 18 Apr 2021.
Vancouver:
Davila-Rodriguez J. External Cavity Mode-locked Semiconductor Lasers For The Generation Of Ultra-low Noise Multi-gigahertz Frequency Combs And Applications In Multi-heterodyne Detection Of Arbitrary Optical Waveforms. [Internet] [Doctoral dissertation]. University of Central Florida; 2013. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/2526.
Council of Science Editors:
Davila-Rodriguez J. External Cavity Mode-locked Semiconductor Lasers For The Generation Of Ultra-low Noise Multi-gigahertz Frequency Combs And Applications In Multi-heterodyne Detection Of Arbitrary Optical Waveforms. [Doctoral Dissertation]. University of Central Florida; 2013. Available from: https://stars.library.ucf.edu/etd/2526
University of Central Florida
7.
Hoghooghi, Nazanin.
Injection-locked Semiconductor Lasers For Realization Of Novel Rf Photonics Components.
Degree: 2012, University of Central Florida
URL: https://stars.library.ucf.edu/etd/2205
► This dissertation details the work has been done on a novel resonant cavity linear interferometric modulator and a direct phase detector with channel filtering capability…
(more)
▼ This dissertation details the work has been done on a novel resonant cavity linear interferometric modulator and a direct phase detector with channel filtering capability using injection-locked semiconductor lasers for applications in RF photonics. First, examples of optical systems whose performance can be greatly enhanced by using a linear intensity modulator are presented and existing linearized modulator designs are reviewed. The novel linear interferometric optical intensity modulator based on an injection-locked laser as an arcsine phase modulator is introduced and followed by numerical simulations of the phase and amplitude response of an injection-locked semiconductor laser. The numerical model is then extended to study the effects of the injection ratio, nonlinear cavity response, depth of phase and amplitude modulation on the spur-free dynamic range of a semiconductor resonant cavity linear modulator. Experimental results of the performance of the linear modulator implemented with a multi-mode Fabry-Perot semiconductor laser as the resonant cavity are shown and compared with the theoretical model. The modulator performance using a vertical cavity surface emitting laser as the resonant cavity is investigated as well. Very low Vπ in the order of 1 mV, multi-gigahertz bandwidth (-10 dB bandwidth of 5 GHz) and a spur-free dynamic range of 120 dB.Hz2/3 were measured directly after the modulator. The performance of the modulator in an analog link is experimentally investigated and the results show no degradation of the modulator linearity after a 1 km of SMF. The focus of the work then shifts to applications of an injection-locked semiconductor laser as a direct phase detector and channel filter. This phase detection technique does not iv require a local oscillator. Experimental results showing the detection and channel filtering capability of an injection-locked semiconductor diode laser in a three channel system are shown. The detected electrical signal has a signal-to-noise ratio better than 60 dB/Hz. In chapter 4, the phase noise added by an injection-locked vertical cavity surface emitting laser is studied using a self-heterodyne technique. The results show the dependency of the added phase noise on the injection ratio and detuning frequency. The final chapter outlines the future works on the linear interferometric intensity modulator including integration of the modulator on a semiconductor chip and the design of the modulator for input pulsed light.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Linear modulator; injection locking; injection locked semiconductor laser; vcsel; phase detector; channel filter; Electromagnetics and Photonics; Optics; Dissertations, Academic – Optics and Photonics, Optics and Photonics – Dissertations, Academic
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APA (6th Edition):
Hoghooghi, N. (2012). Injection-locked Semiconductor Lasers For Realization Of Novel Rf Photonics Components. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/2205
Chicago Manual of Style (16th Edition):
Hoghooghi, Nazanin. “Injection-locked Semiconductor Lasers For Realization Of Novel Rf Photonics Components.” 2012. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/2205.
MLA Handbook (7th Edition):
Hoghooghi, Nazanin. “Injection-locked Semiconductor Lasers For Realization Of Novel Rf Photonics Components.” 2012. Web. 18 Apr 2021.
Vancouver:
Hoghooghi N. Injection-locked Semiconductor Lasers For Realization Of Novel Rf Photonics Components. [Internet] [Doctoral dissertation]. University of Central Florida; 2012. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/2205.
Council of Science Editors:
Hoghooghi N. Injection-locked Semiconductor Lasers For Realization Of Novel Rf Photonics Components. [Doctoral Dissertation]. University of Central Florida; 2012. Available from: https://stars.library.ucf.edu/etd/2205
University of Central Florida
8.
Williams, Charles.
Injection Locking Of Semiconductor Mode-locked Lasers For Long-term Stability Of Widely Tunable Frequency Combs.
Degree: 2013, University of Central Florida
URL: https://stars.library.ucf.edu/etd/2594
► Harmonically mode-locked semiconductor lasers with external ring cavities offer high repetition rate pulse trains while maintaining low optical linewidth via long cavity storage times. Single…
(more)
▼ Harmonically mode-locked semiconductor lasers with external ring cavities offer high repetition rate pulse trains while maintaining low optical linewidth via long cavity storage times. Single frequency injection locking generates widely-spaced and tunable frequency combs from these harmonically mode-locked lasers, while stabilizing the optical frequencies. The output is stabilized long-term with the help of a feedback loop utilizing either a novel technique based on Pound-Drever-Hall stabilization or by polarization spectroscopy. Error signals of both techniques are simulated and compared to experimentally obtained signals. Frequency combs spaced by 2.5 GHz and ~10 GHz are generated, with demonstrated optical sidemode suppression of unwanted modes of 36 dB, as well as RF supermode noise suppression of 14 dB for longer than 1 hour. In addition to the injection locking of actively harmonically mode-locked lasers, the injection locking technique for regeneratively mode-locked lasers, or Coupled OptoElectronic Oscillators (COEOs), is also demonstrated and characterized extensively.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Semiconductor lasers; laser injection locking; harmonically mode locked lasers; frequency combs; coupled opto electronic oscillator; Electromagnetics and Photonics; Optics; Dissertations, Academic – Optics and Photonics, Optics and Photonics – Dissertations, Academic
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APA (6th Edition):
Williams, C. (2013). Injection Locking Of Semiconductor Mode-locked Lasers For Long-term Stability Of Widely Tunable Frequency Combs. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/2594
Chicago Manual of Style (16th Edition):
Williams, Charles. “Injection Locking Of Semiconductor Mode-locked Lasers For Long-term Stability Of Widely Tunable Frequency Combs.” 2013. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/2594.
MLA Handbook (7th Edition):
Williams, Charles. “Injection Locking Of Semiconductor Mode-locked Lasers For Long-term Stability Of Widely Tunable Frequency Combs.” 2013. Web. 18 Apr 2021.
Vancouver:
Williams C. Injection Locking Of Semiconductor Mode-locked Lasers For Long-term Stability Of Widely Tunable Frequency Combs. [Internet] [Doctoral dissertation]. University of Central Florida; 2013. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/2594.
Council of Science Editors:
Williams C. Injection Locking Of Semiconductor Mode-locked Lasers For Long-term Stability Of Widely Tunable Frequency Combs. [Doctoral Dissertation]. University of Central Florida; 2013. Available from: https://stars.library.ucf.edu/etd/2594
University of Central Florida
9.
Bhooplapur, Sharad.
Injection-Locked Vertical Cavity Surface Emitting Lasers (VCSELs) for Optical Arbitrary Waveform Generation.
Degree: 2014, University of Central Florida
URL: https://stars.library.ucf.edu/etd/4603
► Complex optical pulse shapes are typically generated from ultrashort laser pulses by manipulating the optical spectrum of the input pulses. This generates complex but periodic…
(more)
▼ Complex optical pulse shapes are typically generated from ultrashort laser pulses by manipulating the optical spectrum of the input pulses. This generates complex but periodic time-domain waveforms. Optical Arbitrary Waveform Generation (OAWG) builds on the techniques of ultrashort pulse-shaping, with the goal of making non-periodic, truly arbitrary optical waveforms. Some applications of OAWG are coherently controlling chemical reactions on a femtosecond time scale, improving the performance of LADAR systems, high-capacity optical telecommunications and ultra wideband signals processing. In this work, an array of Vertical Cavity Surface Emitting Lasers (VCSELs) are used as modulators, by injection-locking each VCSEL to an individual combline from an optical frequency comb source. Injection-locking ensures that the VCSELs' emission is phase coherent with the input combline, and modulating its current modulates mainly the output optical phase. The multi-GHz modulation bandwidth of VCSELs updates the output optical pulse shape on a pulse-to-pulse time scale, which is an important step towards true OAWG. In comparison, it is about a million times faster than the liquid-crystal modulator arrays typically used for pulse shaping! Novel components and subsystems of Optical Arbitrary Waveform Generation (OAWG) are developed and demonstrated in this work. They include: 1. Modulators An array of VCSELs is packaged and characterized for use as a modulator for rapid?update pulse?shaping at GHz rates. The amplitude and phase modulation characteristics of an injection-locked VCSEL are simultaneously measured at GHz modulation rates. 2. Optical Frequency Comb Sources An actively mode-locked semiconductor laser was assembled, with a 12.5 GHz repetition rate, ~ 200 individually resolvable comblines directly out of the laser, and high frequency stability. In addition, optical frequency comb sources are generated by modulation of a single frequency laser. 3. High-resolution optical spectral demultiplexers The demultiplexers are implemented using bulk optics, and are used to spatially resolve individual optical comblines onto the modulator array. 4. Optical waveform measurement techniques Several techniques are used to measure generated waveforms, especially for spectral phase measurements, including multi-heterodyne phase retrieval. In addition, an architecture for discriminating between ultrashort encoded optical pulses with record high sensitivity is demonstrated.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Semiconductor laser; vcsel; pulse shaping; ultrashort pulse; modelocked lasers; optical arbitrary waveform generation; optical waveform measurement; Electromagnetics and Photonics; Optics; Dissertations, Academic – Optics and Photonics; Optics and Photonics – Dissertations, Academic
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APA (6th Edition):
Bhooplapur, S. (2014). Injection-Locked Vertical Cavity Surface Emitting Lasers (VCSELs) for Optical Arbitrary Waveform Generation. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/4603
Chicago Manual of Style (16th Edition):
Bhooplapur, Sharad. “Injection-Locked Vertical Cavity Surface Emitting Lasers (VCSELs) for Optical Arbitrary Waveform Generation.” 2014. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/4603.
MLA Handbook (7th Edition):
Bhooplapur, Sharad. “Injection-Locked Vertical Cavity Surface Emitting Lasers (VCSELs) for Optical Arbitrary Waveform Generation.” 2014. Web. 18 Apr 2021.
Vancouver:
Bhooplapur S. Injection-Locked Vertical Cavity Surface Emitting Lasers (VCSELs) for Optical Arbitrary Waveform Generation. [Internet] [Doctoral dissertation]. University of Central Florida; 2014. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/4603.
Council of Science Editors:
Bhooplapur S. Injection-Locked Vertical Cavity Surface Emitting Lasers (VCSELs) for Optical Arbitrary Waveform Generation. [Doctoral Dissertation]. University of Central Florida; 2014. Available from: https://stars.library.ucf.edu/etd/4603
University of Central Florida
10.
Nguyen, Dat.
Dynamic Feedback Pulse Shaping For High Power Chirped Pulse Amplification System.
Degree: 2013, University of Central Florida
URL: https://stars.library.ucf.edu/etd/2668
► The topic of this proposal is the development of high peak power laser sources with a focus on linearly chirped pulse laser sources. In the…
(more)
▼ The topic of this proposal is the development of high peak power laser sources with a focus on linearly chirped pulse laser sources. In the past decade chirped optical pulses have found a plethora of applications such as photonic analog-to-digital conversion, optical coherence tomography, laser ranging, etc. This dissertation analyzes the aforementioned applications of linearly chirped pulses and their technical requirements, as well as the performance of previously demonstrated parabolic pulse shaping approaches. The experimental research addresses the topic of parabolic pulse generation in two distinct ways. First, pulse shaping technique involving a time domain approach is presented, that results in stretched pulses with parabolic profiles with temporal duration of 15 ns. After pulse is shaped into a parabolic intensity profile, the pulse is compressed with DCF fiber spool by 100 times to 80 ps duration at FWHM. A different approach of pulse shaping in frequency domain is performed, in which a spectral processor based on Liquid Crystal on Silicon technology is used. The pulse is stretched to 1.5 ns before intensity mask is applied, resulting in a parabolic intensity profile. Due to frequency to time mapping, its temporal profile is also parabolic. After pulse shaping, the pulse is compressed with a bulk compressor, and subsequently analyzed with a Frequency Resolved Optical Gating (FROG). The spectral content of the compressed pulse is feedback to the spectral processor and used to adjust the spectral phase mask applied on the pulse. The resultant pulse iv after pulse shaping with feedback mechanism is a Fourier transform, sub-picosecond ultrashort pulse with 5 times increase in peak power. The appendices in this dissertation provide additional material used for the realization of the main research focus of the dissertation. Specification and characterization of major components of equipments and devices used in the experiment are present. The description of Matlab algorithms that was used to calculate required signals for pulse shaping are shown. A brief description of the Labview code used to control the spectral processor will also be illustrated.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Ultrafast optics; laser; optical amplifiers; pulse shaping; high power oscillators; fiber lasers; Physics; Dissertations, Academic – Sciences, Sciences – Dissertations, Academic
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APA (6th Edition):
Nguyen, D. (2013). Dynamic Feedback Pulse Shaping For High Power Chirped Pulse Amplification System. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/2668
Chicago Manual of Style (16th Edition):
Nguyen, Dat. “Dynamic Feedback Pulse Shaping For High Power Chirped Pulse Amplification System.” 2013. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/2668.
MLA Handbook (7th Edition):
Nguyen, Dat. “Dynamic Feedback Pulse Shaping For High Power Chirped Pulse Amplification System.” 2013. Web. 18 Apr 2021.
Vancouver:
Nguyen D. Dynamic Feedback Pulse Shaping For High Power Chirped Pulse Amplification System. [Internet] [Doctoral dissertation]. University of Central Florida; 2013. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/2668.
Council of Science Editors:
Nguyen D. Dynamic Feedback Pulse Shaping For High Power Chirped Pulse Amplification System. [Doctoral Dissertation]. University of Central Florida; 2013. Available from: https://stars.library.ucf.edu/etd/2668
University of Central Florida
11.
Ardey, Abhijeet.
On-Chip Optical Stabilization of High-Speed Mode-locked Quantum Dot Lasers for Next Generation Optical Networks.
Degree: 2014, University of Central Florida
URL: https://stars.library.ucf.edu/etd/4735
► Monolithic passively mode-locked colliding pulse semiconductor lasers generating pico- to sub-picosecond terahertz optical pulse trains are promising sources for future applications in ultra-high speed data…
(more)
▼ Monolithic passively mode-locked colliding pulse semiconductor lasers generating pico- to sub-picosecond terahertz optical pulse trains are promising sources for future applications in ultra-high speed data transmission systems and optical measurements. However, in the absence of external synchronization, these passively mode-locked lasers suffer from large amplitude and timing jitter instabilities resulting in broad comb linewidths, which precludes many applications in the field of coherent communications and signal processing where a much narrower frequency line set is needed. In this dissertation, a novel quantum dot based coupled cavity laser is presented, where for the first time, four-wave mixing (FWM) in the monolithically integrated saturable absorber is used to injection lock a monolithic colliding pulse mode-locked (CPM) laser with a mode-locked high-Q ring laser. Starting with a passively mode-locked master ring laser, a stable 30 GHz optical pulse train is generated with more than 10 dB reduction in the RF noise level at 20 MHz offset and close to 3-times reduction in the average optical linewidth of the injection locked CPM slave laser. The FWM process is subsequently verified experimentally and conclusively shown to be the primary mechanism responsible for the observed injection locking. Other linear scattering effects are found to be negligible, as predicted in the orthogonal waveguide configuration. The novel injection locking technique is further exploited by employing optical hybrid mode-locking and increasing the Q of the master ring cavity, to realize an improved stabilization architecture. Dramatic reduction is shown with more than 14-times reduction in the photodetected beat linewidth and almost 5-times reduction in the optical linewidth of the injection locked slave laser with generation of close to transform limited pulses at ~ 30 GHz. These results demonstrate the effectiveness of the novel injection locking technique for an all-on-chip stability transfer and provides a new way of stabilizing monolithic optical pulse sources for applications in future high speed optical networks.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Mode locking; optical pulse generation; quantum dot; four wave mixing; optical injection locking; timing jitter; Physics; Dissertations, Academic – Sciences; Sciences – Dissertations, Academic
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APA (6th Edition):
Ardey, A. (2014). On-Chip Optical Stabilization of High-Speed Mode-locked Quantum Dot Lasers for Next Generation Optical Networks. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/4735
Chicago Manual of Style (16th Edition):
Ardey, Abhijeet. “On-Chip Optical Stabilization of High-Speed Mode-locked Quantum Dot Lasers for Next Generation Optical Networks.” 2014. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/4735.
MLA Handbook (7th Edition):
Ardey, Abhijeet. “On-Chip Optical Stabilization of High-Speed Mode-locked Quantum Dot Lasers for Next Generation Optical Networks.” 2014. Web. 18 Apr 2021.
Vancouver:
Ardey A. On-Chip Optical Stabilization of High-Speed Mode-locked Quantum Dot Lasers for Next Generation Optical Networks. [Internet] [Doctoral dissertation]. University of Central Florida; 2014. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/4735.
Council of Science Editors:
Ardey A. On-Chip Optical Stabilization of High-Speed Mode-locked Quantum Dot Lasers for Next Generation Optical Networks. [Doctoral Dissertation]. University of Central Florida; 2014. Available from: https://stars.library.ucf.edu/etd/4735
University of Central Florida
12.
Piracha, Mohammad Umar.
A Laser Radar Employing Linearly Chirped Pulses From A Mode-locked Laser For Long Range, Unambiguous, Sub-millimeter Resolution Ranging And Velocimetry.
Degree: 2012, University of Central Florida
URL: https://stars.library.ucf.edu/etd/2232
► Light detection and ranging (lidar) is used for various applications such as remote sensing, altimetry and imaging. In this talk, a linearly chirped pulse source…
(more)
▼ Light detection and ranging (lidar) is used for various applications such as remote sensing, altimetry and imaging. In this talk, a linearly chirped pulse source is introduced that generates wavelength-swept pulses exhibiting ~6 nm optical bandwidth with > 20 km coherence length. The chirped pulses are used in an interferometric lidar setup to perform distance measurements with sub-millimeter resolution (using pulses that are a few meters long), at target distances > 10 km, with at least 25 dB signal-to-noise ratio at the receiver. A pulse repetition rate of 20 MHz provides fast update rates, while chirped pulse amplification allows easy amplification of optical signals to high power levels that are required for long range operation. A pulse tagging scheme based on phase modulation is used to demonstrate unambiguous, long range measurements. In addition to this, simultaneous measurement of target range and Doppler velocity is performed using a target moving at a speed of over 330 km/h (205 mph) inside the laboratory. In addition to this, spectral phase modulation of the chirped pulses is demonstrated to compensate for the undesirable ripple in the group delay of the chirped pulses. Moreover, spectral amplitude modulation is used to generate pulses with Gaussian temporal intensity profiles and a two-fold increase in the lidar range resolution (284 um) is observed.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Lidar; . Ladar; laser; radar; ranging; distance measurement; chirp; group delay ripple; gratings; mode locked laser; velocimetry; metrology; optical sensing; Electrical and Computer Engineering; Electrical and Electronics; Engineering; Dissertations, Academic – Engineering and Computer Science, Engineering and Computer Science – Dissertations, Academic
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APA (6th Edition):
Piracha, M. U. (2012). A Laser Radar Employing Linearly Chirped Pulses From A Mode-locked Laser For Long Range, Unambiguous, Sub-millimeter Resolution Ranging And Velocimetry. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/2232
Chicago Manual of Style (16th Edition):
Piracha, Mohammad Umar. “A Laser Radar Employing Linearly Chirped Pulses From A Mode-locked Laser For Long Range, Unambiguous, Sub-millimeter Resolution Ranging And Velocimetry.” 2012. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/2232.
MLA Handbook (7th Edition):
Piracha, Mohammad Umar. “A Laser Radar Employing Linearly Chirped Pulses From A Mode-locked Laser For Long Range, Unambiguous, Sub-millimeter Resolution Ranging And Velocimetry.” 2012. Web. 18 Apr 2021.
Vancouver:
Piracha MU. A Laser Radar Employing Linearly Chirped Pulses From A Mode-locked Laser For Long Range, Unambiguous, Sub-millimeter Resolution Ranging And Velocimetry. [Internet] [Doctoral dissertation]. University of Central Florida; 2012. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/2232.
Council of Science Editors:
Piracha MU. A Laser Radar Employing Linearly Chirped Pulses From A Mode-locked Laser For Long Range, Unambiguous, Sub-millimeter Resolution Ranging And Velocimetry. [Doctoral Dissertation]. University of Central Florida; 2012. Available from: https://stars.library.ucf.edu/etd/2232
13.
Bagnell, Kristina.
Noise, Stability, and Linewidth Performance of 10-GHz Optical Frequency Combs Generated from the Nested Cavity Architecture.
Degree: 2017, University of Central Florida
URL: https://stars.library.ucf.edu/etd/5579
► Optical frequency combs with wide mode spacing and low timing jitter are relied upon for both time domain and frequency domain applications. It has been…
(more)
▼ Optical frequency combs with wide mode spacing and low timing jitter are relied upon for both time domain and frequency domain applications. It has been previously demonstrated that surrounding a low-Q semiconductor laser chip with a long external fiber cavity and inserting a high finesse Fabry–Pérot etalon into this cavity can produce a mode-locked laser with the desired high repetition rate and narrow optical mode linewidths which are of benefit to applications like photonic analog-to-digital conversion and astronomical spectrograph calibration. With this nested cavity architecture, the quality factor of the resonator is effectively determined by the product of the individual quality factors of the long fiber cavity and the short etalon cavity.
Passive cavity Q and intracavity power both influence mode-locked laser mode linewidth, optical frequency stability, and the phase noise of the photodetected output. The nested cavity architecture has been demonstrated at 10-GHz mode spacing a few times with increasing etalon finesse and once with a high saturation power semiconductor gain medium to increase intracavity power. No one system has been fully characterized for long term optical frequency stability, phase noise and timing jitter, and optical mode linewidth. As a result, the trade-offs involved with advancing any one element (e.g. increasing cavity Q by adding fiber length and maintaining a broad spectral region of low dispersion for broad-bandwidth operation) have not been fully examined. In this work, three cavity elements are identified for study to influence cavity Q, effective noise spur suppression, and intracavity power, and the trade-offs of pushing those parameters to new limits are experimentally demonstrated. In the process, we also demonstrate nested cavity systems with fractional frequency instability on the order of 10-13, timing jitter as low as 20 fs, and Hz-level linewidths.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Electromagnetics and Photonics; Optics
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APA (6th Edition):
Bagnell, K. (2017). Noise, Stability, and Linewidth Performance of 10-GHz Optical Frequency Combs Generated from the Nested Cavity Architecture. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/5579
Chicago Manual of Style (16th Edition):
Bagnell, Kristina. “Noise, Stability, and Linewidth Performance of 10-GHz Optical Frequency Combs Generated from the Nested Cavity Architecture.” 2017. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/5579.
MLA Handbook (7th Edition):
Bagnell, Kristina. “Noise, Stability, and Linewidth Performance of 10-GHz Optical Frequency Combs Generated from the Nested Cavity Architecture.” 2017. Web. 18 Apr 2021.
Vancouver:
Bagnell K. Noise, Stability, and Linewidth Performance of 10-GHz Optical Frequency Combs Generated from the Nested Cavity Architecture. [Internet] [Doctoral dissertation]. University of Central Florida; 2017. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/5579.
Council of Science Editors:
Bagnell K. Noise, Stability, and Linewidth Performance of 10-GHz Optical Frequency Combs Generated from the Nested Cavity Architecture. [Doctoral Dissertation]. University of Central Florida; 2017. Available from: https://stars.library.ucf.edu/etd/5579
University of Central Florida
14.
Kim, Jimyung.
Quantum Dot Based Mode-locked Semiconductor Lasers And Applications.
Degree: 2010, University of Central Florida
URL: https://stars.library.ucf.edu/etd/4284
► In this dissertation, self-assembled InAs/InGaAs quantum dot Fabry-Perot lasers and mode-locked lasers are investigated. The mode-locked lasers investigated include monolithic and curved two-section devices, and…
(more)
▼ In this dissertation, self-assembled InAs/InGaAs quantum dot Fabry-Perot lasers and mode-locked lasers are investigated. The mode-locked lasers investigated include monolithic and curved two-section devices, and colliding pulse mode-locked diode lasers. Ridge waveguide semiconductor lasers have been designed and fabricated by wet etching processes. Electroluminescence of the quantum dot lasers is studied. Cavity length dependent lasing via ground state and/or excited state transitions is observed from quantum dot lasers and the optical gain from both transitions is measured. Stable optical pulse trains via ground and excited state transitions are generated using a grating coupled external cavity with a curved two-section device. Large differences in the applied reverse bias voltage on the saturable absorber are observed for stable mode-locking from the excited and ground state mode-locking regimes. The optical pulses from quantum dot mode-locked lasers are investigated in terms of chirp sign and linear chirp magnitude. Upchirped pulses with large linear chirp magnitude are observed from both ground and excited states. Externally compressed pulse widths from the ground and excited states are 1.2 ps and 970 fs, respectively. Ground state optical pulses from monolithic mode-locked lasers e.g., two-section devices and colliding pulse mode-locked lasers, are also studied. Transformed limited optical pulses (~4.5 ps) are generated from a colliding pulse mode-locked semiconductor laser. The above threshold linewidth enhancement factor of quantum dot Fabry-Perot lasers is measured using the continuous wave injection locking method. A strong spectral dependence of the linewidth enhancement factor is observed around the gain peak. The measured linewidth enhancement factor is highest at the gain peak, but becomes lower 10 nm away from the gain peak. The lowest linewidth enhancement factor is observed on the anti-Stokes side. The spectral dependence of the pulse duration from quantum dot based mode-locked lasers is also observed. Shorter pulses and reduced linear chirp are observed on the anti-Stokes side and externally compressed 660 fs pulses are achieved in this spectral regime. A novel clock recovery technique using passively mode-locked quantum dot lasers is investigated. The clock signal (~4 GHz) is recovered by injecting an interband optical pulse train to the saturable absorber section. The excited state clock signal is recovered through the ground state transition and vice-versa. Asymmetry in the locking bandwidth is observed. The measured locking bandwidth is 10 times wider when the excited state clock signal is recovered from the ground state injection, as compared to recovering a ground state clock signal from excited state injection.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Quantum Dot; Semiconductor Laser; Mode-lock; Injection Locking; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Kim, J. (2010). Quantum Dot Based Mode-locked Semiconductor Lasers And Applications. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/4284
Chicago Manual of Style (16th Edition):
Kim, Jimyung. “Quantum Dot Based Mode-locked Semiconductor Lasers And Applications.” 2010. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/4284.
MLA Handbook (7th Edition):
Kim, Jimyung. “Quantum Dot Based Mode-locked Semiconductor Lasers And Applications.” 2010. Web. 18 Apr 2021.
Vancouver:
Kim J. Quantum Dot Based Mode-locked Semiconductor Lasers And Applications. [Internet] [Doctoral dissertation]. University of Central Florida; 2010. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/4284.
Council of Science Editors:
Kim J. Quantum Dot Based Mode-locked Semiconductor Lasers And Applications. [Doctoral Dissertation]. University of Central Florida; 2010. Available from: https://stars.library.ucf.edu/etd/4284
University of Central Florida
15.
Ozharar, Sarper.
Stable Optical Frequency Comb Generation And Applications In Arbitrary Waveform Generation, Signal Processing And Optical Data M.
Degree: 2008, University of Central Florida
URL: https://stars.library.ucf.edu/etd/3732
► This thesis focuses on the generation and applications of stable optical frequency combs. Optical frequency combs are defined as equally spaced optical frequencies with a…
(more)
▼ This thesis focuses on the generation and applications of stable optical frequency combs. Optical frequency combs are defined as equally spaced optical frequencies with a fixed phase relation among themselves. The conventional source of optical frequency combs is the optical spectrum of the modelocked lasers. In this work, we investigated alternative methods for optical comb generation, such as dual sine wave phase modulation, which is more practical and cost effective compared to modelocked lasers stabilized to a reference. Incorporating these comblines, we have generated tunable RF tones using the serrodyne technique. The tuning range was ±1 MHz, limited by the electronic waveform generator, and the RF carrier frequency is limited by the bandwidth of the photodetector. Similarly, using parabolic phase modulation together with time division multiplexing, RF chirp extension has been realized. Another application of the optical frequency combs studied in this thesis is real time data mining in a bit stream. A novel optoelectronic logic gate has been developed for this application and used to detect an 8 bit long target pattern. Also another approach based on orthogonal Hadamard codes have been proposed and explained in detail. Also novel intracavity modulation schemes have been investigated and applied for various applications such as a) improving rational harmonic modelocking for repetition rate multiplication and pulse to pulse amplitude equalization, b) frequency skewed pulse generation for ranging and c) intracavity active phase modulation in amplitude modulated modelocked lasers for supermode noise spur suppression and integrated jitter reduction. The thesis concludes with comments on the future work and next steps to improve some of the results presented in this work.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Optical Frequency Combs; Phase Modulation; Arbitrary Waveform Generation; Data Mining; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Ozharar, S. (2008). Stable Optical Frequency Comb Generation And Applications In Arbitrary Waveform Generation, Signal Processing And Optical Data M. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/3732
Chicago Manual of Style (16th Edition):
Ozharar, Sarper. “Stable Optical Frequency Comb Generation And Applications In Arbitrary Waveform Generation, Signal Processing And Optical Data M.” 2008. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/3732.
MLA Handbook (7th Edition):
Ozharar, Sarper. “Stable Optical Frequency Comb Generation And Applications In Arbitrary Waveform Generation, Signal Processing And Optical Data M.” 2008. Web. 18 Apr 2021.
Vancouver:
Ozharar S. Stable Optical Frequency Comb Generation And Applications In Arbitrary Waveform Generation, Signal Processing And Optical Data M. [Internet] [Doctoral dissertation]. University of Central Florida; 2008. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/3732.
Council of Science Editors:
Ozharar S. Stable Optical Frequency Comb Generation And Applications In Arbitrary Waveform Generation, Signal Processing And Optical Data M. [Doctoral Dissertation]. University of Central Florida; 2008. Available from: https://stars.library.ucf.edu/etd/3732
University of Central Florida
16.
Choi, Myoung-Taek.
Ultrashort, High Power, And Ultralow Noise Mode-locked Optical Pulse Generation Using Quantum-dot Semiconductor Lasers.
Degree: 2006, University of Central Florida
URL: https://stars.library.ucf.edu/etd/1061
► This dissertation explores various aspects and potential of optical pulse generation based on active, passive, and hybrid mode-locked quantum dot semiconductor lasers with target applications…
(more)
▼ This dissertation explores various aspects and potential of optical pulse generation based on active, passive, and hybrid mode-locked quantum dot semiconductor lasers with target applications such as optical interconnect and high speed signal processing. Design guidelines are developed for the single mode operation with suppressed reflection from waveguide discontinuities. The device fabrication procedure is explained, followed by characteristics of FP laser, SOA, and monolithic two-section devices. Short pulse generation from an external cavity mode-locked QD two-section diode laser is studied. High quality, sub-picosecond (960 fs), high peak power (1.2 W) pulse trains are obtained. The sign and magnitude of pulse chirp were measured for the first time. The role of the self-phase modulation and the linewidth enhancement factor in QD mode-locked lasers is addressed. The noise performance of two-section mode-locked lasers and a SOA-based ring laser was investigated. Significant reduction of the timing jitter under hybrid mode-locked operation was achieved owing to more than one order of magnitude reduction of the linewidth in QD gain media. Ultralow phase noise performance (integrated timing jitter of a few fs at a 10 GHz repetition rate) was demonstrated from an actively mode-locked unidirectional ring laser. These results show that quantum dot mode-locked lasers are strong competitors to conventional semiconductor lasers in noise performance. Finally we demonstrated an opto-electronic oscillator (OEO) and coupled opto-electronic oscillators (COEO) which have the potential for both high purity microwave and low noise optical pulse generation. The phase noise of the COEO is measured by the photonic delay line frequency discriminator method. Based on this study we discuss the prospects of the COEO as a low noise optical pulse source.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Optical Pulse Noise Mode-locking Quantum-Dot Semiconductor Laser; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Choi, M. (2006). Ultrashort, High Power, And Ultralow Noise Mode-locked Optical Pulse Generation Using Quantum-dot Semiconductor Lasers. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/1061
Chicago Manual of Style (16th Edition):
Choi, Myoung-Taek. “Ultrashort, High Power, And Ultralow Noise Mode-locked Optical Pulse Generation Using Quantum-dot Semiconductor Lasers.” 2006. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/1061.
MLA Handbook (7th Edition):
Choi, Myoung-Taek. “Ultrashort, High Power, And Ultralow Noise Mode-locked Optical Pulse Generation Using Quantum-dot Semiconductor Lasers.” 2006. Web. 18 Apr 2021.
Vancouver:
Choi M. Ultrashort, High Power, And Ultralow Noise Mode-locked Optical Pulse Generation Using Quantum-dot Semiconductor Lasers. [Internet] [Doctoral dissertation]. University of Central Florida; 2006. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/1061.
Council of Science Editors:
Choi M. Ultrashort, High Power, And Ultralow Noise Mode-locked Optical Pulse Generation Using Quantum-dot Semiconductor Lasers. [Doctoral Dissertation]. University of Central Florida; 2006. Available from: https://stars.library.ucf.edu/etd/1061
University of Central Florida
17.
Lee, Shinwook.
High Power Mode-locked Semiconductor Lasers And Their Applications.
Degree: 2008, University of Central Florida
URL: https://stars.library.ucf.edu/etd/3722
► In this dissertation, a novel semiconductor mode-locked oscillator which is an extension of eXtreme Chirped Pulse Amplification (XCPA) is investigated. An eXtreme Chirped Pulse Oscillator…
(more)
▼ In this dissertation, a novel semiconductor mode-locked oscillator which is an extension of eXtreme Chirped Pulse Amplification (XCPA) is investigated. An eXtreme Chirped Pulse Oscillator (XCPO) implemented with a Theta cavity also based on a semiconductor gain is presented for generating more than 30ns frequency-swept pulses with more than 100pJ of pulse energy and 3.6ps compressed pulses directly from the oscillator. The XCPO shows the two distinct characteristics which are the scalability of the output energy and the mode-locked spectrum with respect to repetition rate. The laser cavity design allows for low repetition rate operation <100MHz. The cavity significantly reduces nonlinear carrier dynamics, integrated self phase modulation (SPM), and fast gain recovery in a Semiconductor optical Amplifier (SOA). Secondly, a functional device, called a Grating Coupled Surface Emitting Laser (GCSEL) is investigated. For the first time, passive and hybrid mode-locking of a GCSEL is achieved by using saturable absorption in the passive section of GCSEL. To verify the present limitation of the GCSEL for passive and hybrid mode-locking, a dispersion matched cavity is explored. In addition, a Grating Coupled surface emitting Semiconductor Optical Amplifier (GCSOA) is also investigated to achieve high energy pulse. An energy extraction experiment for GCSOA using stretched pulses generated from the colliding pulse semiconductor mode-locked laser via a chirped fiber bragg grating, which exploits the XCPA advantages is also demonstrated. Finally, passive optical cavity amplification using an enhancement cavity is presented. In order to achieve the interferometric stability, the Hänsch-Couillaud Method is employed to stabilize the passive optical cavity. The astigmatism-free optical cavity employing an acousto-optic modulator (AOM) is designed and demonstrated. In the passive optical cavity, a 7.2 of amplification factor is achieved with a 50 KHz dumping rate.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Mode-locked laser; Semiconductor; Grating-coupled Surface-emitting Laser; Passive Optical Cavity; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Lee, S. (2008). High Power Mode-locked Semiconductor Lasers And Their Applications. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/3722
Chicago Manual of Style (16th Edition):
Lee, Shinwook. “High Power Mode-locked Semiconductor Lasers And Their Applications.” 2008. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/3722.
MLA Handbook (7th Edition):
Lee, Shinwook. “High Power Mode-locked Semiconductor Lasers And Their Applications.” 2008. Web. 18 Apr 2021.
Vancouver:
Lee S. High Power Mode-locked Semiconductor Lasers And Their Applications. [Internet] [Doctoral dissertation]. University of Central Florida; 2008. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/3722.
Council of Science Editors:
Lee S. High Power Mode-locked Semiconductor Lasers And Their Applications. [Doctoral Dissertation]. University of Central Florida; 2008. Available from: https://stars.library.ucf.edu/etd/3722
University of Central Florida
18.
Resan, Bojan.
Dispersion-managed Breathing-mode Semiconductor Mode-locked Ring Laser.
Degree: 2004, University of Central Florida
URL: https://stars.library.ucf.edu/etd/228
► A novel dispersion-managed breathing-mode semiconductor mode-locked ring laser is developed. The "breathing-mode" designation derives from the fact that intracavity pulses are alternately stretched and compressed…
(more)
▼ A novel dispersion-managed breathing-mode semiconductor mode-locked ring laser is developed. The "breathing-mode" designation derives from the fact that intracavity pulses are alternately stretched and compressed as they circulate around the ring resonator. The pulses are stretched before entering the semiconductor gain medium to minimize the detrimental strong integrating self-phase modulation and to enable efficient pulse amplification. Subsequently compressed pulses facilitate bleaching the semiconductor saturable absorber. The intracavity pulse compression ratio is higher than 50. Down chirping when compared to up chirping allows broader mode-locked spectra and shorter pulse generation owing to temporal and spectral semiconductor gain dynamics. Pulses as short as 185 fs, with a peak power of ~230 w, and a focused intensity of ~4.6 gw/cm2 are generated by linear down chirp compensation and characterized by shg-frog method. To our knowledge, this is the highest peak power and the shortest pulse generation from an electrically pumped all-semiconductor system. The very good agreement between the simulated and the measured results verifies our understanding and ability to control the physical mechanisms involved in the pulse shaping within the ring cavity. Application trends such as continuum generation via a photonic crystal fiber, two-photon fluorescence imaging, and ultrafast pulse source for pump-probe experiments are demonstrated.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: optics; lasers; mode-locked lasers; semiconductor lasers; ultrafast pulse generation; ultrafast technology; high power lasers; laser physics; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Resan, B. (2004). Dispersion-managed Breathing-mode Semiconductor Mode-locked Ring Laser. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/228
Chicago Manual of Style (16th Edition):
Resan, Bojan. “Dispersion-managed Breathing-mode Semiconductor Mode-locked Ring Laser.” 2004. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/228.
MLA Handbook (7th Edition):
Resan, Bojan. “Dispersion-managed Breathing-mode Semiconductor Mode-locked Ring Laser.” 2004. Web. 18 Apr 2021.
Vancouver:
Resan B. Dispersion-managed Breathing-mode Semiconductor Mode-locked Ring Laser. [Internet] [Doctoral dissertation]. University of Central Florida; 2004. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/228.
Council of Science Editors:
Resan B. Dispersion-managed Breathing-mode Semiconductor Mode-locked Ring Laser. [Doctoral Dissertation]. University of Central Florida; 2004. Available from: https://stars.library.ucf.edu/etd/228
University of Central Florida
19.
Archundia-Berra, Luis.
External Cavity Multiwavelength Semiconductor Mode-locked Laser Gain Dynamics.
Degree: 2006, University of Central Florida
URL: https://stars.library.ucf.edu/etd/1020
► External cavity semiconductor mode-locked lasers can produce pulses of a few picoseconds. The pulses from these lasers are inherently chirped with a predominant linear chirp…
(more)
▼ External cavity semiconductor mode-locked lasers can produce pulses of a few picoseconds. The pulses from these lasers are inherently chirped with a predominant linear chirp component that can be compensated resulting in sub-picosecond pulses. External cavity semiconductor mode-locked lasers can be configured as multiwavelength pulse sources and are good candidates for time and wavelength division multiplexing applications. The gain medium in external cavity semiconductor mode-locked lasers is a semiconductor optical amplifier (SOA), and passive and hybrid mode-locked operation are achieved by the introduction of a saturable absorber (SA) in the laser cavity. Pump-probe techniques were used to measure the intracavity absorption dynamics of a SA in an external cavity semiconductor mode-locked laser and the gain dynamics of a SOA for the amplification of diverse pulses. The SOA gain dynamics measurements include the amplification of 750 fs pulses, 6.5 ps pulses, multiwavelength pulses and the intracavity gain dynamics of an external cavity multiwavelength semiconductor mode-locked laser. The experimental results show how the inherent chirp on pulses from external cavity semiconductor mode-locked lasers results in a slow gain depletion without significant fast gain dynamics. In the multiwavelength operation regime of these lasers, the chirp broadens the temporal pulse profile and decreases the temporal beating resulting from the phase correlation among wavelength channels. This results in a slow gain depletion mitigating nonlinearities and gain competition among wavelength channels in the SOA supporting the multiwavelength operation of the laser. Numerical simulations support the experimental results.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Mode-locked semiconductor lasers; multiwavelength lasers; semiconductor dynamics; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Archundia-Berra, L. (2006). External Cavity Multiwavelength Semiconductor Mode-locked Laser Gain Dynamics. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/1020
Chicago Manual of Style (16th Edition):
Archundia-Berra, Luis. “External Cavity Multiwavelength Semiconductor Mode-locked Laser Gain Dynamics.” 2006. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/1020.
MLA Handbook (7th Edition):
Archundia-Berra, Luis. “External Cavity Multiwavelength Semiconductor Mode-locked Laser Gain Dynamics.” 2006. Web. 18 Apr 2021.
Vancouver:
Archundia-Berra L. External Cavity Multiwavelength Semiconductor Mode-locked Laser Gain Dynamics. [Internet] [Doctoral dissertation]. University of Central Florida; 2006. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/1020.
Council of Science Editors:
Archundia-Berra L. External Cavity Multiwavelength Semiconductor Mode-locked Laser Gain Dynamics. [Doctoral Dissertation]. University of Central Florida; 2006. Available from: https://stars.library.ucf.edu/etd/1020
University of Central Florida
20.
Quinlan, Franklyn.
Low Noise, High Repetition Rate Semiconductor-based Mode-locked Lasers For Signal Processing And Coherent Communications.
Degree: 2008, University of Central Florida
URL: https://stars.library.ucf.edu/etd/3724
► This dissertation details work on high repetition rate semiconductor mode-locked lasers. The qualities of stable pulse trains and stable optical frequency content are the focus…
(more)
▼ This dissertation details work on high repetition rate semiconductor mode-locked lasers. The qualities of stable pulse trains and stable optical frequency content are the focus of the work performed. First, applications of such lasers are reviewed with particular attention to applications only realizable with laser performance such as presented in this dissertation. Sources of timing jitter are also reviewed, as are techniques by which the timing jitter of a 10 GHz optical pulse train may be measured. Experimental results begin with an exploration of the consequences on the timing and amplitude jitter of the phase noise of an RF source used for mode-locking. These results lead to an ultralow timing jitter source, with 30 fs of timing jitter (1 Hz to 5 GHz, extrapolated). The focus of the work then shifts to generating a stabilized optical frequency comb. The first technique to generating the frequency comb is through optical injection. It is shown that not only can injection locking stabilize a mode-locked laser to the injection seed, but linewidth narrowing, timing jitter reduction and suppression of superfluous optical supermodes of a harmonically mode-locked laser also result. A scheme by which optical injection locking can be maintained long term is also proposed. Results on using an intracavity etalon for supermode suppression and optical frequency stabilization then follow. An etalon-based actively mode-locked laser is shown to have a timing jitter of only 20 fs (1Hz-5 GHz, extrapolated), optical linewidths below 10 kHz and optical frequency instabilities less than 400 kHz. By adding dispersion compensating fiber, the optical spectrum was broadened to 2 THz and 800 fs duration pulses were obtained. By using the etalon-based actively mode-locked laser as a basis, a completely self-contained frequency stabilized coupled optoelectronic oscillator was built and characterized. By simultaneously stabilizing the optical frequencies and the pulse repetition rate to the etalon, a 10 GHz comb source centered at 1550 nm was realized. This system maintains the high quality performance of the actively mode-locked laser while significantly reducing the size weight and power consumption of the system. This system also has the potential for outperforming the actively mode-locked laser by increasing the finesse and stability of the intracavity etalon. The final chapter of this dissertation outlines the future work on the etalon-based coupled optoelectronic oscillator, including the incorporation of a higher finesse, more stable etalon and active phase noise suppression of the RF signal. Two appendices give details on phase noise measurements that incorporate carrier suppression and the noise model for the coupled optoelectronic oscillator.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: mode-locked lasers; semiconductor lasers; optical frequency comb; laser stabilization; signal processing; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Quinlan, F. (2008). Low Noise, High Repetition Rate Semiconductor-based Mode-locked Lasers For Signal Processing And Coherent Communications. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/3724
Chicago Manual of Style (16th Edition):
Quinlan, Franklyn. “Low Noise, High Repetition Rate Semiconductor-based Mode-locked Lasers For Signal Processing And Coherent Communications.” 2008. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/3724.
MLA Handbook (7th Edition):
Quinlan, Franklyn. “Low Noise, High Repetition Rate Semiconductor-based Mode-locked Lasers For Signal Processing And Coherent Communications.” 2008. Web. 18 Apr 2021.
Vancouver:
Quinlan F. Low Noise, High Repetition Rate Semiconductor-based Mode-locked Lasers For Signal Processing And Coherent Communications. [Internet] [Doctoral dissertation]. University of Central Florida; 2008. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/3724.
Council of Science Editors:
Quinlan F. Low Noise, High Repetition Rate Semiconductor-based Mode-locked Lasers For Signal Processing And Coherent Communications. [Doctoral Dissertation]. University of Central Florida; 2008. Available from: https://stars.library.ucf.edu/etd/3724
University of Central Florida
21.
Stegeman, Robert.
Direct Nonlinear Optics Measurements Of Raman Gain In Bulk Glasses And Estimates Of Fiber Performance.
Degree: 2006, University of Central Florida
URL: https://stars.library.ucf.edu/etd/907
► The need for more bandwidth in communications has stimulated the search for new fiberizable materials with properties superior to fused silica which is the current…
(more)
▼ The need for more bandwidth in communications has stimulated the search for new fiberizable materials with properties superior to fused silica which is the current state-of-the-art. One of the key properties is Raman gain by which a pump beam amplifies a signal beam of longer wavelength. An apparatus capable of directly measuring the spectral dependence and absolute magnitude of the material Raman gain coefficient using nonlinear optics techniques has been built. Using radiation from a 1064 nm Nd:YAG laser as the pump and from a tunable Optical Parametric Generator and Amplifier as the signal, the Raman gain spectrum was measured for different families of glass samples with millimeter thickness. A number of glass families were investigated. Tellurites with added oxides of tungsten, niobium, and thallium produced the largest Raman gain coefficients of any oxide family reported to date, typically 30-50 times higher than that of fused silica. On the other hand, phosphate families were found with spectrally broad Raman gain response, 5 times broader than fused silica and flat to [plus or minus] dB over the full spectral range in some compositions. Although the chalcogenides were found to photodamage easily, coefficients 50 - 80 times that of fused silica were measured. Finally, a numerical study was undertaken to predict the theoretical performance and noise properties of tellurite fibers for communications. Included in the computer modeling were linear loss; the interaction among multiple pumps and signals; forward and/or backward propagating pump beams; forward, backward and double Rayleigh scattering; noise properties of amplifiers; excess noise, etc. This led to a comparison of the optical signal-to-noise characteristics for Raman gain in a tellurite versus a silica fiber.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Raman gain; tellurites; phosphate; chalcogenide; fiber optic amplifier; Raman dispersion; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Stegeman, R. (2006). Direct Nonlinear Optics Measurements Of Raman Gain In Bulk Glasses And Estimates Of Fiber Performance. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/907
Chicago Manual of Style (16th Edition):
Stegeman, Robert. “Direct Nonlinear Optics Measurements Of Raman Gain In Bulk Glasses And Estimates Of Fiber Performance.” 2006. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/907.
MLA Handbook (7th Edition):
Stegeman, Robert. “Direct Nonlinear Optics Measurements Of Raman Gain In Bulk Glasses And Estimates Of Fiber Performance.” 2006. Web. 18 Apr 2021.
Vancouver:
Stegeman R. Direct Nonlinear Optics Measurements Of Raman Gain In Bulk Glasses And Estimates Of Fiber Performance. [Internet] [Doctoral dissertation]. University of Central Florida; 2006. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/907.
Council of Science Editors:
Stegeman R. Direct Nonlinear Optics Measurements Of Raman Gain In Bulk Glasses And Estimates Of Fiber Performance. [Doctoral Dissertation]. University of Central Florida; 2006. Available from: https://stars.library.ucf.edu/etd/907
University of Central Florida
22.
Lee, Wangkuen.
High-speed Modelocked Semiconductor Lasers And Applications In Coherent Photonic Systems.
Degree: 2007, University of Central Florida
URL: https://stars.library.ucf.edu/etd/3238
► 1.55-µm high-speed modelocked semiconductor lasers are theoretically and experimentally studied for various coherent photonic system applications. The modelocked semiconductor lasers (MSLs) are designed with high-speed…
(more)
▼ 1.55-µm high-speed modelocked semiconductor lasers are theoretically and experimentally studied for various coherent photonic system applications. The modelocked semiconductor lasers (MSLs) are designed with high-speed (>5 GHz) external cavity configurations utilizing monolithic two-section curved semiconductor optical amplifiers. By exploiting the saturable absorber section of the monolithic device, passive or hybrid mode-locking techniques are used to generate short optical pulses with broadband optical frequency combs. Laser frequency stability is improved by applying the Pound-Drever-Hall (PDH) frequency stabilization technique to the MSLs. The improved laser performance after the frequency stabilization (a frequency drifting of less than 350 MHz), is extensively studied with respect to the laser linewidth (~ 3 MHz), the relative intensity noise (RIN) (< -150 dB/Hz), as well as the modal RIN (~ 3 dB reduction). MSL to MSL, and tunable laser to MSL synchronization is demonstrated by using a dual-mode injection technique and a modulation sideband injection technique, respectively. Dynamic locking behavior and locking bandwidth are experimentally and theoretically studied. Stable laser synchronization between two MSLs is demonstrated with an injection seed power on the order of a few microwatt. Several coherent heterodyne detections based on the synchronized MSL systems are demonstrated for applications in microwave photonic links and ultra-dense wavelength division multiplexing (UD-WDM) system. In addition, efficient coherent homodyne balanced receivers based on synchronized MSLs are developed and demonstrated for a spectrally phase-encoded optical CDMA (SPE-OCDMA) system.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: Modelocking; External Cavity Semiconductor Laser; High-Speed Photonics; RIN; PDH; Linewidth; Coherent Detection; Analog Links; WDM; OCDMA; Electromagnetics and Photonics; Optics
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APA ·
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MLA ·
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APA (6th Edition):
Lee, W. (2007). High-speed Modelocked Semiconductor Lasers And Applications In Coherent Photonic Systems. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/3238
Chicago Manual of Style (16th Edition):
Lee, Wangkuen. “High-speed Modelocked Semiconductor Lasers And Applications In Coherent Photonic Systems.” 2007. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/3238.
MLA Handbook (7th Edition):
Lee, Wangkuen. “High-speed Modelocked Semiconductor Lasers And Applications In Coherent Photonic Systems.” 2007. Web. 18 Apr 2021.
Vancouver:
Lee W. High-speed Modelocked Semiconductor Lasers And Applications In Coherent Photonic Systems. [Internet] [Doctoral dissertation]. University of Central Florida; 2007. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/3238.
Council of Science Editors:
Lee W. High-speed Modelocked Semiconductor Lasers And Applications In Coherent Photonic Systems. [Doctoral Dissertation]. University of Central Florida; 2007. Available from: https://stars.library.ucf.edu/etd/3238
University of Central Florida
23.
Kim, Inwoong.
Synchronization In Advanced Optical Communications.
Degree: 2006, University of Central Florida
URL: https://stars.library.ucf.edu/etd/855
► The objective of this dissertation is to generate high power ultrashort optical pulses from an all-semiconductor mode-locked laser system. The limitations of semiconductor optical amplifier…
(more)
▼ The objective of this dissertation is to generate high power ultrashort optical pulses from an all-semiconductor mode-locked laser system. The limitations of semiconductor optical amplifier in high energy, ultrashort pulse amplification are reviewed. A method to overcome the fundamental limit of small stored energy inside semiconductor optical amplifier called "eXtreme Chirped Pulse Amplification (X-CPA)" is proposed and studied theoretically and experimentally. The key benefits of the concept of X-CPA are addressed. Based on theoretical and experimental study, an all-semiconductor mode-locked X-CPA system consisting of a mode-locked master oscillator, an optical pulse pre-stretcher, a semiconductor optical amplifier (SOA) pulse picker, an extreme pulse stretcher/compressor, cascaded optical amplifiers, and a bulk grating compressor is successfully demonstrated and generates >kW record peak power. A potential candidate for generating high average power from an X-CPA system, novel grating coupled surface emitting semiconductor laser (GCSEL) devices, are studied experimentally. The first demonstration of mode-locking with GCSELs and associated amplification characteristics of grating coupled surface emitting SOAs will be presented. In an effort to go beyond the record setting results of the X-CPA system, a passive optical cavity amplification technique in conjunction with the X-CPA system is constructed, and studied experimentally and theoretically.
Advisors/Committee Members: Delfyett, Peter.
Subjects/Keywords: mode-locked laser; semiconductor laser; optical pulse compression; chirped fiber Bragg grating; ultrafast laser; semiconductor optical amplifier; chirped pulse amplification; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Kim, I. (2006). Synchronization In Advanced Optical Communications. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/855
Chicago Manual of Style (16th Edition):
Kim, Inwoong. “Synchronization In Advanced Optical Communications.” 2006. Doctoral Dissertation, University of Central Florida. Accessed April 18, 2021.
https://stars.library.ucf.edu/etd/855.
MLA Handbook (7th Edition):
Kim, Inwoong. “Synchronization In Advanced Optical Communications.” 2006. Web. 18 Apr 2021.
Vancouver:
Kim I. Synchronization In Advanced Optical Communications. [Internet] [Doctoral dissertation]. University of Central Florida; 2006. [cited 2021 Apr 18].
Available from: https://stars.library.ucf.edu/etd/855.
Council of Science Editors:
Kim I. Synchronization In Advanced Optical Communications. [Doctoral Dissertation]. University of Central Florida; 2006. Available from: https://stars.library.ucf.edu/etd/855
. 
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