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Open Access

Adaptive Electronic Dispersion Compensator for Chromatic and Polarization-Mode Dispersions in Optical Communication Systems

EURASIP Journal on Advances in Signal Processing20052005:164123

Received: 1 April 2004

Published: 30 June 2005


The widely-used LMS algorithm for coefficient updates in adaptive (feedforward/decision-feedback) equalizers is found to be suboptimal for ASE-dominant systems but various coefficient-dithering approaches suffer from slow adaptation rate without guarantee of convergence. In view of the non-Gaussian nature of optical noise after the square-law optoelectronic conversion, we propose to apply the higher-order least-mean 2 th-order (LMN) algorithms resulting in OSNR penalty which is 1.5–2 dB less than that of LMS. Furthermore, combined with adjustable slicer threshold control, the proposed equalizer structures are demonstrated through extensive Monte Carlo simulations to achieve better performance.

Keywords and phrases:

electronic PMD compensationadaptive equalizationsignal processingoptical communicationleast-mean fourth-order algorithmleast-mean-square algorithm

Authors’ Affiliations

Bell Labs, Lucent Technologies, Murray Hill, USA


© Koc 2005