Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise
In this article, we analyze the performance of adaptive filtering in the context of dual-polarization coherent optical flexible bit-rate transceivers. We investigate the ability of different adaptive algorithms to track fast state-of-polarization (SOP) transients in the presence of colored noise. Co...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Journal of Computer Networks and Communications |
| Online Access: | http://dx.doi.org/10.1155/2019/2938653 |
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| author | Ahmad Abdo Claude D’Amours |
| author_facet | Ahmad Abdo Claude D’Amours |
| author_sort | Ahmad Abdo |
| collection | DOAJ |
| description | In this article, we analyze the performance of adaptive filtering in the context of dual-polarization coherent optical flexible bit-rate transceivers. We investigate the ability of different adaptive algorithms to track fast state-of-polarization (SOP) transients in the presence of colored noise. Colored noise exists due to the concatenation of Wavelength Selective Switches (WSSs) and polarization dependent loss (PDL) which can be considered as spatially dependent noise. We consider the use of different modulation formats, and the practical limitation of error signal feedback delay in decision-directed adaptive filters is also taken into account. The back-to-back required signal-to-noise ratio (RSNR) penalty that can be tolerated determines the maximum SOP rate of change that can be tracked by the adaptive filters as well as the filter’s adaptive step size. We show that the recursive least squares algorithm, using the covariance matrix as an aggressive “step size,” has a much better convergence speed compared to the least mean squares (LMS) and normalized LMS (NLMS) algorithms in the presence of colored noise in the fiber. However, the three algorithms have similar tracking capabilities in the absence of colored noise. |
| format | Article |
| id | doaj-art-38c5a70caaa4447bbbada21f8d91cf5f |
| institution | OA Journals |
| issn | 2090-7141 2090-715X |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Computer Networks and Communications |
| spelling | doaj-art-38c5a70caaa4447bbbada21f8d91cf5f2025-08-20T02:38:58ZengWileyJournal of Computer Networks and Communications2090-71412090-715X2019-01-01201910.1155/2019/29386532938653Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored NoiseAhmad Abdo0Claude D’Amours1School of Electrical Engineering and Computer Science, The University of Ottawa, Ottawa, Ontario K1N6N5, CanadaSchool of Electrical Engineering and Computer Science, The University of Ottawa, Ottawa, Ontario K1N6N5, CanadaIn this article, we analyze the performance of adaptive filtering in the context of dual-polarization coherent optical flexible bit-rate transceivers. We investigate the ability of different adaptive algorithms to track fast state-of-polarization (SOP) transients in the presence of colored noise. Colored noise exists due to the concatenation of Wavelength Selective Switches (WSSs) and polarization dependent loss (PDL) which can be considered as spatially dependent noise. We consider the use of different modulation formats, and the practical limitation of error signal feedback delay in decision-directed adaptive filters is also taken into account. The back-to-back required signal-to-noise ratio (RSNR) penalty that can be tolerated determines the maximum SOP rate of change that can be tracked by the adaptive filters as well as the filter’s adaptive step size. We show that the recursive least squares algorithm, using the covariance matrix as an aggressive “step size,” has a much better convergence speed compared to the least mean squares (LMS) and normalized LMS (NLMS) algorithms in the presence of colored noise in the fiber. However, the three algorithms have similar tracking capabilities in the absence of colored noise.http://dx.doi.org/10.1155/2019/2938653 |
| spellingShingle | Ahmad Abdo Claude D’Amours Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise Journal of Computer Networks and Communications |
| title | Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise |
| title_full | Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise |
| title_fullStr | Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise |
| title_full_unstemmed | Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise |
| title_short | Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise |
| title_sort | adaptive filtering in optical coherent flexible bit rate receivers in the presence of state of polarization transients and colored noise |
| url | http://dx.doi.org/10.1155/2019/2938653 |
| work_keys_str_mv | AT ahmadabdo adaptivefilteringinopticalcoherentflexiblebitratereceiversinthepresenceofstateofpolarizationtransientsandcolorednoise AT claudedamours adaptivefilteringinopticalcoherentflexiblebitratereceiversinthepresenceofstateofpolarizationtransientsandcolorednoise |