Abstract
Digital coherent optical receivers enable equalization of fiber transmission impairments and carrier-phase estimation in digital domain. In this paper, a novel equalization and carrier-phase recovery algorithm, both based on modified constant-modulus algorithm (CMA), is proposed for polarization-division multiplexed quadrature phase-shift keying (PDM-QPSK) systems. The proposed scheme is validated with 40-Gbits/s PDM-QPSK transmission experiments.
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