Variable-step-size LMS adaptive filter for digital chromatic dispersion compensation in PDM-QPSK coherent transmission system
2009 (English)In: 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, SPIE - International Society for Optical Engineering, 2009, 75062I- p.Conference paper (Refereed)
High bit rates optical communication systems pose the challenge of their tolerance to linear and nonlinear fiber impairments. Digital filters in coherent optical receivers can be used to mitigate the chromatic dispersion entirely in the optical transmission system. In this paper, the least mean square adaptive filter has been developed for chromatic equalization in a 112-Gbit/s polarization division multiplexed quadrature phase shift keying coherent optical transmission system established on the VPIphotonics simulation platform. It is found that the chromatic dispersion equalization shows a better performance when a smaller step size is used. However, the smaller step size in least mean square filter will lead to a slower iterative operation to achieve the guaranteed convergence. In order to solve this contradiction, an adaptive filter employing variable-step-size least mean square algorithm is proposed to compensate the chromatic dispersion in the 112-Gbit/s coherent communication system. The variable-step-size least mean square filter could make a compromise and optimization between the chromatic dispersion equalization performance and the algorithm converging speed. Meanwhile, the required tap number and the converged tap weights distribution of the variable-step-size least mean square filter for a certain fiber chromatic dispersion are analyzed and discussed in the investigation of the filter feature.
Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2009. 75062I- p.
, Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 7506
Chromatic dispersion (CD), Coherent optical receivers, Least mean square (LMS) adaptive filter, Polarization division multiplexed quadrature phase shift keying (PDM-QPSK), Variable-step-size least mean square (VLMS) adaptive filter
IdentifiersURN: urn:nbn:se:kth:diva-152776DOI: 10.1117/12.837834ScopusID: 2-s2.0-74049161903ISBN: 978-081947892-4OAI: oai:DiVA.org:kth-152776DiVA: diva2:755620
2009 International Conference on Optical Instruments and Technology, OIT 2009, 19 October 2009 through 22 October 2009, Shanghai, China
QC 201410152014-10-152014-10-012014-10-15Bibliographically approved