Abstract
Low-density parity-check (LDPC)-coded orthogonal frequency division multiplexing (OFDM) is studied as an efficient coded modulation scheme suitable for simultaneous chromatic dispersion and polarization mode dispersion (PMD) compensation. We show that, for aggregate rate of 10 Gb/s, accumulated dispersion over 6500 km of SMF and differential group delay of 100 ps can be simultaneously compensated with penalty within 1.5 dB (with respect to the back-to-back configuration) when training sequence based channel estimation and girth-10 LDPC codes of rate 0.8 are employed.
Highlights
Orthogonal frequency division multiplexing (OFDM) [1,2,3,4,5,6,7,8,9,10] represents a particular multicarrier transmission scheme in which a single information-bearing stream is transmitted over many lower rate sub-channels
The net effective coding gain at bit-error rate (BER) of 10-12 is 10.95 dB, which represents the largest net effective coding gain, on an additive white Gaussian noise (AWGN) channel, ever reported in optical communications. Given this description of Low-density parity-check (LDPC)-coded OFDM, and the design of LDPC codes to be used in coded-OFDM, we describe our application of interest: the use of LDPC-coded OFDM in simultaneous chromatic dispersion and polarization mode dispersion (PMD) compensation
In this paper we study the LDPC-coded single-side band (SSB) OFDM as an efficient coded modulation scheme suitable for simultaneous chromatic dispersion and PMD compensation
Summary
Orthogonal frequency division multiplexing (OFDM) [1,2,3,4,5,6,7,8,9,10] represents a particular multicarrier transmission scheme in which a single information-bearing stream is transmitted over many lower rate sub-channels. By using a sufficiently large number of sub-carriers and cyclic extension principle, the intersymbol interference (ISI) due to chromatic dispersion and polarization mode dispersion (PMD) can be significantly reduced [4,5,6,7,8,9] To simultaneously compensate both residual chromatic dispersion and PMD someone may use the turbo equalization [11] or maximum-likelihood sequence detection (MLSD). We will show that by using codedOFDM with training sequence based channel estimation, equipped with girth-10 LDPC codes, it is possible to simultaneously compensate for the accumulated chromatic dispersion over 6500 km of SMF and 100 ps of differential group delay with penalty
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