模拟信号在SOA中的交叉相位调制特性研究

Research of analog signal's cross phase modulation in SOA

为了研究模拟光信号在半导体光放大器中的交叉相位调制特性,以正弦波和三角波两种模拟光信号为例,采用数值计算的方法,详细分析了交叉相位调制过程中模拟信号的增益、非线性相移差和啁啾。结果表明,当信号光和控制光之间采用帧同步方式时,信号光脉冲各点的增益及增益差出现波动,非线性相移差将围绕理想值π出现不同程度的偏离;采用比特同步方式可使信号光脉冲各点非线性相移差均衡,此时所需的控制光脉冲和信号光脉冲波形类似。

Taking example for sine wave and triangle wave, this paper analyzes analog optical signal＇ s cross phase modulation characteristics in semiconductor optical amplifier, including gain, nonlinear phase difference and chirp. Analysis shows that when using the frame synchronization between signal light and optical control pulse, the gain and gain difference at each point of signal pulse will fluctuate, the nonlinear phase difference also will deviate from the ideal value of π. In order to obtain the same nonlinear phase difference at different point of signal pulse, bit synchronization mode should be used, and the needed optical control pulse has the similar waveform to optical signal pulse.