半导体光放大器中SPM效应对光脉冲传输性能的影响

为了研究半导体光放大器（SOA）中自相位调制（SPM）效应对光信号传输性能的影响，从SOA中光脉冲的传输方程出发，采用数学推导的方法，分析了SPM 效应的产生机理，得到了光脉冲经SOA 放大后的时域和频域变化特性，并针对无啁啾和带啁啾光脉冲两种情况进行了仿真研究。结果表明:SPM 导致了光脉冲时域波形的倾斜和频谱的红移，并且随增益的变大倾斜和红移的程度增强；啁啾系数的符号决定了频谱是红移还是蓝移。

Transmission properties of optical pulse influenced by SPM in semiconductor optical amplifier

In order to study the transmission properties of optical signal influenced by self-phase modulation (SPM) in semiconductor optical amplifier (SOA), based on the transmission equation, the generation principle of SPM was analyzed, the temporal and spectral characteristics of pulse transmitting through the SOA were obtained, the simulations are made separately to the pulse with no chirp and pulse with chirp. The result shows that SPM makes the shape of pulse decline and makes the spectrum broaden to lower frequency, and the degree of declination and broadening increases with growth of the gain of SOA, the sign of chirp coefficient determines whether the spectrum will be broadened to the high frequency or to the lower frequency.