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对相位调制光通信系统进行幅度和相位的同时再生十分必要。采用半导体光放大器(SOA)作为非线性媒介,搭建一个非线性的马赫曾德尔干涉仪作为再生器,利用SOA的增益特性,在锁相本地振荡抽运源的驱动下,实现对相位调制信号的幅度和相位的同时再生。理论推导了入射光信号经过基于SOA的再生器后的光场分布公式;讨论了不同入射信号光功率下,抽运光与信号光的相位差对信号功率增益的影响,给出了入射光的最优参数;数值仿真了带有噪声的相位调制信号再生前后的相位分布、强度分布和误码率。研究结果表明,基于SOA的光再生器有良好的再生效果。
Simultaneous regeneration of amplitude and phase is essential for phase-modulated optical communication systems. Using semiconductor optical amplifier (SOA) as a nonlinear medium, a non-linear Mach-Zehnder interferometer is built as a regenerator. By utilizing the gain characteristic of SOA, the phase-modulated signal Regeneration of amplitude and phase simultaneously. The theory deduces the optical field distribution formula of the incident optical signal after passing through the SOA-based regenerator. The influence of the phase difference between the pump light and the signal light on the signal power gain is discussed under different optical power of the incident signal. The optimal parameters are obtained. The phase distribution, intensity distribution and bit error rate before and after the phase modulation signal with noise are numerically simulated. The results show that the optical regenerator based on SOA has a good regeneration effect.