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Proceedings Paper

Variable-step-size LMS adaptive filter for digital chromatic dispersion compensation in PDM-QPSK coherent transmission system
Author(s): Tianhua Xu; Gunnar Jacobsen; Sergei Popov; Jie Li; Ke Wang; Ari T. Friberg
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Paper Abstract

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.

Paper Details

Date Published: 30 November 2009
PDF: 8 pages
Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 75062I (30 November 2009); doi: 10.1117/12.837834
Show Author Affiliations
Tianhua Xu, Royal Institute of Technology (Sweden)
Acreo AB (Sweden)
Gunnar Jacobsen, Acreo AB (Sweden)
Sergei Popov, Royal Institute of Technology (Sweden)
Jie Li, Acreo AB (Sweden)
Ke Wang, Royal Institute of Technology (Sweden)
Acreo AB (Sweden)
Ari T. Friberg, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 7506:
2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Yunlong Sheng; Kimio Tatsuno, Editor(s)

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