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  • Research Article
  • 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:


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 compensation
  • adaptive equalization
  • signal processing
  • optical communication
  • least-mean fourth-order algorithm
  • least-mean-square algorithm

Authors’ Affiliations

Bell Labs, Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974, USA


© Koc 2005