无预编码(3,1)矢量信号直接检测系统及其基于LDPC的应用研究  

Research on direct detection system of non-precoded (3, 1) vector signal and its application based on LDPC

作　　者：左江丽 赵闯 ZUO Jiangli;ZHAO Chuang(School of Optical Electrical information and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《智能计算机与应用》2022年第7期108-113,共6页Intelligent Computer and Applications

摘　　要：本文提出一种基于单个马赫曾德尔调制器(Mach Zehnder Modulator, MZM)和光载波抑制调制的二倍频无预编码(3,1)矢量信号方案,理论分析了光矢量信号产生机理,在此系统基础上采用了低密度奇偶校验码(Low Density Parity Check Code, LDPC)来有效补偿光纤色散以及系统器件的非线性带来的信号损伤,提高系统的传输性能。仿真结果表明,在相同速率下,(3,1)矢量信号的误码性能明显优于正交相移键控(Quadrature Phase Shift Keying, QPSK)矢量信号的性能;并且当4 Gbaud速率的(3,1)矢量信号传输15 km标准单模光纤(Standard Single Mode Fiber, SSMF)时,采用LDPC可以获得约3 dB的误码增益。In this paper, a double frequency non-precoded(3, 1) vector signal scheme based on a single Mach Zehnder modulator(MZM) and optical carrier suppressed modulation is proposed. The generation mechanism of optical vector signal is analyzed theoretically. Based on this, low density parity check code(LDPC) is used to effectively compensate the signal damage caused by optical fiber dispersion and nonlinearity of system devices to improve the transmission performance of the system. The simulation results show that at the same rate, the bit error performance of(3, 1) vector signal is obviously better than that of quadrature phase shift keying(QPSK) vector signal. It is found that when the(3, 1) vector signal at 4 Gbaud rate is transmitted through 15 km standard single mode fiber(SSMF), the bit error gain of about 3 dB can be obtained by LDPC.

关 键 词：低密度奇偶校验码 光载波抑制 无预编码(3 1)矢量信号 

分 类 号：TN928[电子电信—通信与信息系统]