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本文设计基于马赫-增德尔构成的PSK调制模型,并分析采用零差相干解调的方式下的系统误码率。搭建基于PSK调制的相干光通信系统模型,在新型光学软件Optisystem软件平台下完成系统的模拟仿真,分析大气湍流对光PSK调制的相干光通信的性能影响,并完成对三种光PSK调制方式的比较。仿真结果表明:在不考虑大气湍流的情况下,BPSK调制的系统误码率最低,QPSK调制与BPSK两者误码率相差较小;随着湍流程度的增加,系统的误码性能降低。对比三种调制方式,BPSK调制更具有优势。
In this paper, PSK modulation model based on Mach-Zehnder is designed, and the system BER under the mode of homodyne demodulation is analyzed. The coherent optical communication system model based on PSK modulation is set up. The simulation of the system is completed under the new optical software Optisystem. The influence of atmospheric turbulence on the performance of PSK modulated coherent optical communication is analyzed, and the performance of three optical PSK modulation schemes Compare The simulation results show that the BER of BPSK modulation is the lowest without considering the atmospheric turbulence, and the bit error rate of QPSK modulation and BPSK is less. With the increase of turbulence, the error performance of the system is reduced. Compared with the three modulation methods, BPSK modulation has more advantages.