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The first experimental demonstration of nonbinary-LDPC-coded optical transmission is presented. Using DQPSK, we can achieve >;8dB and ~10dB net coding gains at the BER of 10-6 in the absence and presence of I/Q imbalance, respectively.
Orthogonal frequency division multiplexing (OFDM) is a technique that provides high data rate communications, but it is sensitive to the carrier frequency offset (CFO) caused by the misalignment in carrier frequencies between transmitter and receiver, which results in Inter-Carrier Interference (ICI) among the sub-carriers and degrades the Carrier-to-Interference Ratio (CIR). In this paper, we propose...
We present a PMD compensation scheme suitable for use in multilevel coded-modulation schemes, with PMD compensation efficiency comparable to that of OFDM, but with lower complexity of both transmitter and receiver. It is based on Alamouti-type polarization-time coding, with LDPC codes as channel codes.
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