脉冲形状对半导体激光放大器用于啁啾补偿的影响

Effect of the pulse shape on chirp compensation using semiconductor laser amplifiers

光脉冲经过增益饱和的行波半导体激光放大器后，由于放大器的自相位调制，使放大脉冲附加上频率啁啾。合适的附加啁啾不但能抵销入射脉冲的初始啁啾，而且还有可能借助简单的群速度延迟线对脉冲进行压缩。本文计算了不同形状的入射脉冲经光放大器放大后的输出脉冲形状及其附加的频率啁啾，分析了它们对光放大器用于啁啾补偿的影响。

As a result of self-phase modulation(SPM),the frequency chirp is im-posed on optical pulses when the optical pulses are amplified in gain-saturated traveling-wave semiconductor laser amplifiers,The proper impressed chirp results in not only can-celing the primary chirp of input pulses,but also possibly compressing pulses with a simple group velocity delay line. In this paper,the shape of the amplified output pulses and impressed frequency chirp are calculated for different input pulses,and the effect on chirp compensation of using optical amplifier is analyzed.