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Efficient Frequency-Domain Implementation of Block-LMS/CMA Fractionally Spaced Equalization for Coherent Optical Communications

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4 Author(s)
Zia-Chahabi, Omid ; Inst. Telecom, Telecom Bretagne, Brest, France ; Le Bidan, R. ; Morvan, Michel ; Laot, Christophe

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:23 ,  Issue: 22 )