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

doi:10.1364/OE.19.018655

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

Research output: Contribution to journal › Article › Research › peer-review

11 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	18655-18664
Number of pages	10
Journal	Optics Express
Volume	19
Issue number	19
DOIs	https://doi.org/10.1364/OE.19.018655
Publication status	Published - 12 Sept 2011
Externally published	Yes

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abstract = "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.",

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AU - Ferreira, Hugo B.

AU - Mello, Darli A A

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

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