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由于光在光纤中传输受到色散的作用以及光纤参量放大器(FOPA)的不理想均会导致光信号在传输过程中的畸变,从而影响光传输系统的误码率(BER)性能。为了减小高非线性光纤(HNLF)和泵浦的影响,本文通过采用由最小环长最大化算法构造的QC-LDPC码作为基于FOPA的40Gbit/s非归零差分移相键控(NRZ-DPSK)调制光通信系统的前向纠错码来降低系统的BER,从而达到提高整个通信系统性能的目的。仿真结果表明,在10km传输光纤条件下,相同码长不同码率的QC-LDPC码可以使BER达到10-11数量级;在相同码型和不同传输光纤长度的条件下,BER也可以达到10-11数量级。利用最小环长最大化算法构造的QC-LDPC码可以纠正通信光在传输中受到光纤色散以及FOPA中HNLF和泵浦抖动引起的相位失配而导致的误码,从而达到了提高通信质量的目的。
Due to the dispersion of light in the optical fiber and the imperfection of the optical parametric amplifier (FOPA), the optical signal may be distorted during transmission, thereby affecting the BER performance of the optical transmission system. In order to reduce the influence of high nonlinear fiber (HNLF) and pump, a QC-LDPC code constructed by the minimum ring length maximization algorithm is used as the basis of FOPA-based 40Gbit / s non-return-to-zero differential phase shift keying (NRZ- DPSK) modulated optical communication system forward error correction code to reduce system BER, so as to achieve the purpose of improving the performance of the entire communication system. The simulation results show that under the condition of 10km transmission fiber, the QC-LDPC codes with the same code length and different code rate can make the BER reach 10-11 orders of magnitude. Under the same code type and different transmission fiber lengths, the BER can reach 10- 11 orders of magnitude. The QC-LDPC code constructed by minimum ring length maximization algorithm can correct the error caused by the optical fiber dispersion and the phase mismatch caused by HNLF and pump jitter in the FOPA transmission, so as to achieve the purpose of improving the communication quality .