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University of New South Wales

1. Ji, Philip Nan. Development of novel fibre optic devices and subsystems for next generation DWDM systems.

Degree: Electrical Engineering & Telecommunications, 2010, University of New South Wales

As the backbone for the global communication network, optical dense wavelength division multiplexed (DWDM) systems are facing challenges in capacity, flexibility, reliability and cost effectiveness. In my thesis research I developed five novel optical devices or subsystems to combat these technical challenges. Each of these devices/subsystems is described in an individual chapter including background survey, proposal of new features, theoretical analysis, hardware design, prototype fabrication and characterization, and experimental verification in DWDM systems.The first is a novel tunable asymmetric interleaver that allows the interleaving ratio to be adjusted dynamically. Two design methods were proposed and implemented. Spectral usage optimisation and overall system performance improvement in 10G/40G and 40G/100G systems were successfully demonstrated through simulations and experiments.The second is a colourless intra-channel optical equalizer. It is a passive periodic filter that restores the overall filter passband to a raised cosine profile to suppress the filter narrowing effect and mitigate the inter-symbol interference. 20% passband widening and 40% eye opening were experimentally achieved.The third is a flexible band tunable filter that allows simultaneous tuning of centre frequency and passband width. Based mainly on this filter, a low cost expendable reconfigurable optical add/drop multiplexer (ROADM) node was developed. Its flexible switching features were experimentally demonstrated in a two-ring four-node network testbed.The fourth is a transponder aggregator subsystem for colourless and directionless multi-degree ROADM node. Using the unique characteristics of the coherent receiver, this technology eliminates the requirement of wavelength selector, thus reduces power consumption, size and cost. I experimentally demonstrated that it can achieve < 0.5 dB penalty between receiving single channel and 96 channels.The last is a real-time feedforward all-order polarization mode dispersion (PMD) compensator. It first analyses spectral interference pattern to retrieve phase information and calculate PMD, then it uses a pulse shaper to restore the pulse shape and thus compensates the PMD. These functions were demonstrated through experiments and simulations.All of these novel devices and subsystems deliver new functional features and are suitable to be applied in the next generation DWDM systems to improve capacity, flexibility, and reliability and to reduce cost. Advisors/Committee Members: Peng, Gang-Ding, Electrical Engineering & Telecommunications, Faculty of Engineering, UNSW.

Subjects/Keywords: Devices; Dense wavelength division multiplexing; Optical communications; Subsystems; Interleaver; Equalizer; Tunable filter; Reconfigurable optical add/drop multiplexer; Polarization mode dispersion

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APA (6th Edition):

Ji, P. N. (2010). Development of novel fibre optic devices and subsystems for next generation DWDM systems. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/50432 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9326/SOURCE1?view=true

Chicago Manual of Style (16th Edition):

Ji, Philip Nan. “Development of novel fibre optic devices and subsystems for next generation DWDM systems.” 2010. Doctoral Dissertation, University of New South Wales. Accessed January 22, 2020. http://handle.unsw.edu.au/1959.4/50432 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9326/SOURCE1?view=true.

MLA Handbook (7th Edition):

Ji, Philip Nan. “Development of novel fibre optic devices and subsystems for next generation DWDM systems.” 2010. Web. 22 Jan 2020.

Vancouver:

Ji PN. Development of novel fibre optic devices and subsystems for next generation DWDM systems. [Internet] [Doctoral dissertation]. University of New South Wales; 2010. [cited 2020 Jan 22]. Available from: http://handle.unsw.edu.au/1959.4/50432 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9326/SOURCE1?view=true.

Council of Science Editors:

Ji PN. Development of novel fibre optic devices and subsystems for next generation DWDM systems. [Doctoral Dissertation]. University of New South Wales; 2010. Available from: http://handle.unsw.edu.au/1959.4/50432 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9326/SOURCE1?view=true

2. Mansoor, Riyadh. Crosstalk and signal integrity in ring resonator based optical add/drop multiplexers for wavelength-division-multiplexing networks.

Degree: PhD, 2015, De Montfort University

With 400 Gbps Ethernet being developed at the time of writing this thesis, all-optical networks are a solution to the increased bandwidth requirements of data communication allowing architectures to become increasingly integrated. High density integration of optical components leads to potential ‘Optical/Photonic’ electromagnetic compatibility (EMC) and signal integrity (SI) issues due to the close proximity of optical components and waveguides. Optical EMC issues are due to backscatter, crosstalk, stray light, and substrate modes. This thesis has focused on the crosstalk in Optical Add/Drop Multiplexers (OADMs) as an EMC problem. The main research question is: “How can signal integrity be improved and crosstalk effects mitigated in small-sized OADMs in order to enhance the optical EMC in all-optical networks and contribute to the increase in integration scalability?” To answer this question, increasing the crosstalk suppression bandwidth rather than maximizing the crosstalk suppression ratio is proposed in ring resonator based OADMs. Ring resonators have a small ‘real estate’ requirement and are, therefore, potentially useful for large scale integrated optical systems. A number of approaches such as over-coupled rings, vertically-coupled rings and rings with random and periodic roughness are adopted to effectively reduce the crosstalk between 10 Gbps modulated channels in OADMs. An electromagnetic simulation-driven optimization technique is proposed and used to optimize filter performance of vertically coupled single ring OADMs. A novel approach to analyse and exploit semi-periodic sidewall roughness in silicon waveguides is proposed. Grating-assisted ring resonator design is presented and optimized to increase the crosstalk suppression bandwidth.

Subjects/Keywords: 621.382; Add/drop filter; Crosstalk; Mason’s rule; Back-reflection; Grating reflectivity; Sidewall roughness.ring resonator; Wavelength Division Multiplexing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mansoor, R. (2015). Crosstalk and signal integrity in ring resonator based optical add/drop multiplexers for wavelength-division-multiplexing networks. (Doctoral Dissertation). De Montfort University. Retrieved from http://hdl.handle.net/2086/11396

Chicago Manual of Style (16th Edition):

Mansoor, Riyadh. “Crosstalk and signal integrity in ring resonator based optical add/drop multiplexers for wavelength-division-multiplexing networks.” 2015. Doctoral Dissertation, De Montfort University. Accessed January 22, 2020. http://hdl.handle.net/2086/11396.

MLA Handbook (7th Edition):

Mansoor, Riyadh. “Crosstalk and signal integrity in ring resonator based optical add/drop multiplexers for wavelength-division-multiplexing networks.” 2015. Web. 22 Jan 2020.

Vancouver:

Mansoor R. Crosstalk and signal integrity in ring resonator based optical add/drop multiplexers for wavelength-division-multiplexing networks. [Internet] [Doctoral dissertation]. De Montfort University; 2015. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/2086/11396.

Council of Science Editors:

Mansoor R. Crosstalk and signal integrity in ring resonator based optical add/drop multiplexers for wavelength-division-multiplexing networks. [Doctoral Dissertation]. De Montfort University; 2015. Available from: http://hdl.handle.net/2086/11396

3. Bendimerad, Djalal Falih. Contribution à l'étude et à la mise en oeuvre de fonction de filtrage pour les brasseurs optiques dédiés au traitement multi-longueurs d'onde : Contribution to the study of filters for the implementation of optical cross-connect devices dedicated to WDM applications.

Degree: Docteur es, Télécommunications, 2012, Evry, Institut national des télécommunications; Université Abou Bekr Belkaid (Tlemcen, Algérie)

La demande croissante des réseaux optiques actuels en termes de bande passante résulte en un besoin d’exploiter la capacité offerte par la fibre optique. Un des moyens indispensable pour permettre ceci est l’utilisation du multiplexage en longueur d’onde. Il en résulte la nécessité d’utilisation de dispositifs, parmi lesquels le filtre optique, agiles en longueur d’onde et transparents par rapport aux débits. C’est dans ce contexte que notre travail se situe. La technologie utilisée est celle des filtres interférentiels en polarisation. Contraint par un cahier des charges particulier aux applications télécoms, le principal objectif consiste en l’augmentation des performances de ce type de filtre d’une part, et l’association de fonctionnalités additionnelles nécessaires dans les réseaux d’autre part. En utilisant le principe physique des interférences en polarisation, une structure est alors implémentée, suivant les contraintes liées aux trois paramètres majeurs du filtre que sont le contraste, la fonction d’égalisation et la reconfiguration de la bande passante. Par ailleurs, les architectures des filtres optiques diffèrent selon l’emplacement dans le réseau. Ainsi, si une architecture des plus simples est utilisée à la réception, au niveau des nœuds du réseau, celle-ci devient beaucoup plus complexe, s’adaptant à différents degrés de nœuds, et portent le nom de multiplexeurs optiques à insertion/extraction de longueur d’onde (ROADM). Un dispositif de ce type, basé sur les filtres biréfringents, est donc présenté. Une approche système est ensuite menée dans le but de mettre en évidence les avantages et les limitations de la technologie utilisée

The growing needs, in term of bandwidth in optical networks, increase over years. To satisfy these needs, the entire bandwidth of the optical fiber has to be exploited. In this context, the wavelength division multiplexing technique is used to allow the utilization of several wavelengths and results in considerably enhanced network bit-rate. However, such networks must use specific components which have particular wavelength-capabilities. Among these components, one of the most important and critical device is the optical filter. Our work is focused on the implementation of specific optical filters, using the polarization interference filter technology. The main purpose of this work is to enhance the filter rejection ratio, and to add new functionalities such as the amplitude equalization and the bandwidth tuning functions. After satisfying optical network expectations, another point, related to the filter utilization in the network, concern the device architecture which is determined by its network-location. A simple architecture with an input and an output is needed at the reception; meanwhile, a specific one is expected at network nodes. Thus, a new kind of devices is introduced, called reconfigurable optical add/drop multiplexers (ROADM). Therefore, such a device is implemented by the birefringent filter developed in this manuscript. Then, the developed device is placed…

Advisors/Committee Members: Benkelfat, Badr-Eddine (thesis director), Seddiki, Omar (thesis director).

Subjects/Keywords: Filtre interférentiel en polarisation; Cristaux liquides; Multiplexeur optique à insertion / extraction de longueur d'onde (ROADM); Polarization interference filter; Liquid cristals; Reconfigurable optical add / drop multiplexers (ROADM)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bendimerad, D. F. (2012). Contribution à l'étude et à la mise en oeuvre de fonction de filtrage pour les brasseurs optiques dédiés au traitement multi-longueurs d'onde : Contribution to the study of filters for the implementation of optical cross-connect devices dedicated to WDM applications. (Doctoral Dissertation). Evry, Institut national des télécommunications; Université Abou Bekr Belkaid (Tlemcen, Algérie). Retrieved from http://www.theses.fr/2012TELE0015

Chicago Manual of Style (16th Edition):

Bendimerad, Djalal Falih. “Contribution à l'étude et à la mise en oeuvre de fonction de filtrage pour les brasseurs optiques dédiés au traitement multi-longueurs d'onde : Contribution to the study of filters for the implementation of optical cross-connect devices dedicated to WDM applications.” 2012. Doctoral Dissertation, Evry, Institut national des télécommunications; Université Abou Bekr Belkaid (Tlemcen, Algérie). Accessed January 22, 2020. http://www.theses.fr/2012TELE0015.

MLA Handbook (7th Edition):

Bendimerad, Djalal Falih. “Contribution à l'étude et à la mise en oeuvre de fonction de filtrage pour les brasseurs optiques dédiés au traitement multi-longueurs d'onde : Contribution to the study of filters for the implementation of optical cross-connect devices dedicated to WDM applications.” 2012. Web. 22 Jan 2020.

Vancouver:

Bendimerad DF. Contribution à l'étude et à la mise en oeuvre de fonction de filtrage pour les brasseurs optiques dédiés au traitement multi-longueurs d'onde : Contribution to the study of filters for the implementation of optical cross-connect devices dedicated to WDM applications. [Internet] [Doctoral dissertation]. Evry, Institut national des télécommunications; Université Abou Bekr Belkaid (Tlemcen, Algérie); 2012. [cited 2020 Jan 22]. Available from: http://www.theses.fr/2012TELE0015.

Council of Science Editors:

Bendimerad DF. Contribution à l'étude et à la mise en oeuvre de fonction de filtrage pour les brasseurs optiques dédiés au traitement multi-longueurs d'onde : Contribution to the study of filters for the implementation of optical cross-connect devices dedicated to WDM applications. [Doctoral Dissertation]. Evry, Institut national des télécommunications; Université Abou Bekr Belkaid (Tlemcen, Algérie); 2012. Available from: http://www.theses.fr/2012TELE0015

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