Abstract
A modified Welch–Costas (MWC) code family for the spectral-amplitude-coding
(SAC) optical code-division multiple-access (OCDMA) system is proposed. On
utilizing the property of the MWC codes, more compact coder/decoders can be
realized via waveguide and fiber gratings. This system has a superior performance
as compared to the previous Walsh–Hadamard-coded OCDMA system. In addition,
we propose a new class of quasi-cyclic low-density parity-check (QC-LDPC)
codes to improve the transmission performance over the MWC-coded OCDMA system
when the data rate is high. Simulation results show that the coding gain of
the proposed QC-LDPC codes is larger than that of the Reed–Solomon codes,
and the performance of the MWC-coded OCDMA system can be greatly improved
by these QC-LDPC codes when data rate is 2.5 Gb/s.
© 2009 IEEE
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