Fiber-based optical parametric amplifier for 40-Gb/s NRZ-DPSK signal transmission system employing QC-LDPC codes

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（11）
• 页码范围: 13-16
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL201311.110601.

摘要

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 fiberbased 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 QCLDPC 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.