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University of Rochester

1. Stentz, Andrew J. (1964 - ). Aspects of the generation and propagation of solitons in optical fibers.

Degree: PhD, 2017, University of Rochester

The recent development of erbium-doped fiber amplifiers has increased interest in nonlinear fiber optics, particularly in soliton-based communication systems. In this thesis, we investigate various aspects of the generation and propagation of optical solitons in passively modelocked fiber lasers and dispersion-decreasing fiber. </br>Nonlinear polarization evolution in nonpolarization-preserving fiber plays a critical role in the passive modelocking of many fiber lasers. In this thesis, we investigate nonlinear polarization evolution in the presence of randomly oriented birefringent elements. We find that under a wide range of conditions, the polarization of intense light undergoes a two-dimensional random walk on the surface of the Poincaré sphere. We also rigorously define and solve for the scalar nonlinear phase shift experienced by light propagating though this system. </br>A fiber figure-eight laser has been constructed for the purpose of studying its operation. We demonstrate that fiber figure-eight lasers constructed with largely unbalanced central couplers are in many ways superior to figure-eight lasers constructed with a balanced 50:50 coupler. We also describe a novel experimental procedure that has allowed us to quantify how polarization effects determine the passive modelocking of fiber figure-eight lasers. Based on our measurements, we have performed numerical simulations demonstrating that the nonlinear switching within the laser operates in a manner contrary to that described by the conventional theory of passive modelocking with a fast saturable absorber. </br>Ultrashort solitons generated with our figure-eight laser were used to test an optical fiber whose group-velocity dispersion decreases exponentially along its length. We experimentally compare the propagation of the solitons through the dispersion-decreasing fiber with that through a constant-dispersion fiber of the same path-averaged dispersion. For a wide range of input powers, the output pulsewidths of the dispersion-decreasing fiber are found to be as short as the input pulsewidths, whereas the output pulsewidths of the constant-dispersion fiber are significantly larger. Numerical simulations of the experiment are performed and are in good agreement with the experimental results.

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

APA (6th Edition):

Stentz, A. J. (. -. ). (2017). Aspects of the generation and propagation of solitons in optical fibers. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/32170

Chicago Manual of Style (16th Edition):

Stentz, Andrew J (1964 - ). “Aspects of the generation and propagation of solitons in optical fibers.” 2017. Doctoral Dissertation, University of Rochester. Accessed November 17, 2017. http://hdl.handle.net/1802/32170.

MLA Handbook (7th Edition):

Stentz, Andrew J (1964 - ). “Aspects of the generation and propagation of solitons in optical fibers.” 2017. Web. 17 Nov 2017.

Vancouver:

Stentz AJ(-). Aspects of the generation and propagation of solitons in optical fibers. [Internet] [Doctoral dissertation]. University of Rochester; 2017. [cited 2017 Nov 17]. Available from: http://hdl.handle.net/1802/32170.

Council of Science Editors:

Stentz AJ(-). Aspects of the generation and propagation of solitons in optical fibers. [Doctoral Dissertation]. University of Rochester; 2017. Available from: http://hdl.handle.net/1802/32170

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