Chinese Optics Letters, Volume. 11, Issue 11, 110601(2013)
Fiber-based optical parametric amplif ier for 40-Gb/s NRZ-DPSK signal transmission system employing QC-LDPC codes
In this letter, we investigate quasi-cyclic low-density parity-check (QC-LDPC) codes in a 40-Gb/s nonreturn-to-zero differential phase-shift keying (NRZ-DPSK) signal transmission system based on a fiber-based optical parametric amplifier (FOPA). A constructed algorithm of QC-LDPC codes according to the optimizing set of shift values on the circulant permutation matrix (CPM) of the basis matrix is proposed. Simulation results prove that the coding gain in the encoded system can be realized at 10.2 dB under QC-LDPC codes with a code rate of 5/6 when the bit error rate (BER) is 10-9. In addition, the error-floor level originating from the uncoded system is suppressed.
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Jian Zheng, Hongxia Bie, Xuekun Zhang, Chunyang Lei, Ming Fang, Sha Li, Zhe Kang. Fiber-based optical parametric amplif ier for 40-Gb/s NRZ-DPSK signal transmission system employing QC-LDPC codes[J]. Chinese Optics Letters, 2013, 11(11): 110601
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Received: Jun. 6, 2013
Accepted: Sep. 16, 2013
Published Online: Nov. 25, 2013
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