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提出了采用基于非线性光纤环形镜(NOLM)的全光2R(再放大、再整形)再生器对星间差分相移键控(DPSK)信号进行放大、整形的方案。理论推导了再生器的工作原理,给出了对信号进行放大、整形的约束条件;仿真研究了再生器的输入输出功率特性和相位特性,分析了耦合器耦合系数对功率特性的影响。结果表明,全光2R再生器对基于自差探测的DPSK系统性能具有显著的改善作用,系统误码率较未使用再生器时降低接近两个量级。
A scheme of amplifying and shaping the intersatellite differential phase shift keying (DPSK) signal using the all-optical 2R (re-amplifying and reshaping) regenerator based on the non-linear fiber loop mirror (NOLM) is proposed. The theory of regenerator is derived theoretically, and the constraints of amplifying and shaping the signal are given. The input and output power characteristics and phase characteristics of regenerator are simulated and the influence of coupler coupling coefficient on power characteristics is analyzed. The results show that the all-optical 2R regenerator has a significant improvement on the DPSK system performance based on self-difference detection, and the system error rate decreases by nearly two orders of magnitude compared with that without regenerator.