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We propose a novel adaptive frequency-domain equalization (FDE) scheme in digital coherent optical receivers, which can work with rationally-oversampled input sequences using the constant-modulus algorithm (CMA). Effectiveness of the proposed scheme is verified with 10-Gbaud dual-polarization QPSK transmission experiments.
We propose the 8-state trellis-coded optical modulation scheme with 24M-ary four-dimensional (4D) QAM constellations. Analyzing its performance, we find that significant coding gain can be achieved against the set-partitioned 4D-QAM without sacrificing the spectral efficiency.
Direct-detection (DD) receivers based on digital signal-processing (DSP) can perform polarization tracking, polarization demultiplexing, and demodulation of multi-level Stokes modulation. Such digital polarization manipulations in DD receivers provide us with cost-effective solutions to 100-Gbit/s transmission.
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