A STUDY OF POLARIZATION ATTRACTION: THE FIRST APPLICATION TO A BPSK SIGNAL AND AN EVALUATION OF ROBUSTNESS TO TRANSMISSION IMPAIRMENTS
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Date
2018-01-01
Type of Work
Department
Computer Science and Electrical Engineering
Program
Engineering, Electrical
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Access limited to the UMBC community. Item may possibly be obtained via Interlibrary Loan thorugh a local library, pending author/copyright holder's permission.
This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
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Abstract
This thesis is a study of polarization attraction (PA), an all-optical polarization regeneration technique. PA is one implementation of a nonlinear lossless polarizer (NLP) that has demonstrated success for pulse train and OOK signals with a high optical signal-to-noise ratio (OSNR). Before PA may be realized as a useful or realistic application for a long-haul transmission system, first it must be experimentally demonstrated as a potential application for phase-shift keyed (PSK) signals. In addition, its robustness to transmission impairments, such as accumulated amplified spontaneous emission (ASE) or nonlinearities, would also need to be evaluated. Hence, this work aims to accomplish both benchmarks for PA to test its efficacy in a more realistic long-haul transmission system. First, an investigation was carried out for the counter-propagating beam configuration of PA employed for a 10.7-GBaud non-return-to-zero binary-phase-shift-keyed (NRZ-BPSK) signal in a highly nonlinear fiber (HNLF) by using the Kerr nonlinear cross-polarization process inherent to that fiber. The receiver sensitivity penalty at the G.709.1 forward error correction (FEC) threshold (bit-error-rate ~ 3.8�10-3) relative to the baseline NRZ-BPSK signal was negligible, when PA was employed and a degree of polarization (DOP) > 90% was achieved. These results are the first to confirm that PA may be employed for BPSK signals. Next, a coherent reception investigation was carried on PA of a 10.7-GBaud NRZ-BPSK signal pre-loaded with ASE. For this ASE-loaded PA experiment the receiver sensitivity penalty at the G.709.1 FEC threshold, was found to be ? 10.5 dB relative to the baseline performance. The final and most complex experiment investigates PA after long-haul 100-GHz DWDM transmission in a recirculating loop. PA on a signal after ~2,400km of transmission was found to achieve approximately the same DOP and receiver sensitivity performance, as that of ASE-loaded PA experiment. The last two experiments lead to the conclusion that the interactions of ASE and fiber nonlinearity, due to the Gordon-Mollenauer effect within the attraction medium, dominate other impairments including those arising in the DWDM transmission.