光脉冲在LOA-XGM中传输的特性

Transmission Characteristics of Optical Pulses in LOA Based on XGM

为了验证线性光放大器的性能,建立了光脉冲在LOA中传输的理论模型,分析了放大器处于增益饱和状态下交叉增益调制效应对传输脉冲的影响、脉冲在LOA中传输的特性,以及不同脉宽对于增益、载流子密度和寿命的影响.结果表明:在相同的信号脉冲峰值增益下,增大抽运光功率或减小探测光功率均使输出脉冲峰值减小;当抽运光功率小于(大于)0.5 mW时,输出脉冲上升时间随探测光功率的增加而增加(减小);随着输入脉冲波长增加,输出脉冲上升时间变长,峰值功率变小;输入脉冲越宽,对载流子密度及其寿命和增益的影响越小.

A theoretical model describing transmission of optical pulses in a linear optical amplifier （LOA） was derived to verify the performances of a linear optical amplifier （LOA）. Under the condition of gain saturation, the effects of cross-gain modulation （XGM） on transmission pulses and the transmission characteristics of optical pulses were analyzed, and the influences of pulse widths on the gain, carrier density and carrier lifetime were discussed. The results show that with the same peak gain of the signal pulse, the peak output power decreases with an increase in the pump power or a decrease in the probe power; the rising time of the output pulse increases （decreases） with an increase in probe power when the pump power is under （over） 0. 5 mW; the rising time of the peak power is delayed by a longer wavelength, accompanied by a decrease in the peak power; and the effect of a wide pulse is weaker than that of a narrow one.