Experimental analysis of singularity avoidance techniques for CMA equalization in DP-QPSK 112-Gb/s optical systems

Valery N. Rozental, Thiago F. Portela, Diego V. Souto, Hugo B. Ferreira, Darli A A Mello

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8 Citations (Scopus)


We experimentally investigate the singularity problem in DP-QPSK 112-Gb/s receivers using the CMA. Three algorithms are compared: Constrained, Two-Stage, and Multi-User. Although these algorithms have been individually evaluated, they have not been compared by extensive experiments. The transmission setup emulates amplifier noise; first-order PMD; and chromatic dispersion. It is shown that all algorithms effectively mitigate singularities. However, under certain conditions, the Multi-User and the Constrained algorithms-both used for system startup-outperformed the Two-Stage, which does not distinguish between system operation and startup. In light of its effectiveness and low computational complexity, we recommend the Constrained algorithm.
Original languageEnglish
Pages (from-to)18655-18664
Number of pages10
JournalOptics Express
Issue number19
Publication statusPublished - 12 Sep 2011
Externally publishedYes

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