Title :
Efficient Frequency-Domain Implementation of Block-LMS/CMA Fractionally Spaced Equalization for Coherent Optical Communications
Author :
Zia-Chahabi, Omid ; Bidan, Raphaël Le ; Morvan, Michel ; Laot, Christophe
Author_Institution :
Inst. Telecom, Telecom Bretagne, Brest, France
Abstract :
We introduce a computationally efficient frequency-domain implementation of a fractionally spaced block-least-mean-square (LMS) or block-constant-modulus-algorithm (CMA) equalizer. The proposed implementation is less complex than its time-domain counterpart. Besides, it lends itself naturally to high-throughput parallel architectures thanks to block-processing based on fast Fourier transforms. The resulting equalizer may be used for adaptive polarization-mode dispersion (PMD) equalization, or for joint adaptive compensation of chromatic dispersion (CD) and PMD in digital coherent receivers.
Keywords :
dispersion (wave); equalisers; fast Fourier transforms; optical communication; optical receivers; polarisation; CMA equalizer; PMD equalization; adaptive polarization-mode dispersion equalization; block-LMS-CMA fractionally spaced equalization; block-constant-modulus-algorithm equalizer; chromatic dispersion; coherent optical communications; digital coherent receivers; fast Fourier transforms; frequency-domain implementation; high-throughput parallel architectures; joint adaptive compensation; Adaptive equalizers; Equations; Frequency domain analysis; Least squares approximation; Optical receivers; Adaptive equalization; coherent detection; digital receiver; frequency-domain equalization; overlap-save;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2166257
