半导体光放大器超快折射率变化动态特性的研究

Theoretical study of ultrafast index dynamics in semiconductor optical amplifiers

建立了分析半导体光放大器(SOA)飞秒量级超快动态特性的数值模型,考虑了增益色散以及群速度色散,能更精确地反映飞秒级超短脉冲经过SOA时的传输特性.基于该模型,可以分析由载流子密度脉动以及载流子加热对折射率变化的影响.同时,也考虑了不同的工作条件以及SOA的结构参数对折射率的影响.理论分析和模拟实验为优化SOA的结构、改善SOA飞秒量级超高速动态特性提供了理论指导.

We proposed a novel extended semiconductor optical amplifier （SOA） model for applications in femtosecond pulse transmission,in which various ultrafast nonlinear effects, such as gain dispersion and group velocity dispersion were taken into account. We analyzed the refractive index in response to variation of the input current and the length of SOA. Furthermore, the impact of carrier density pulsation and carrier heating on the refractive index dynamics of SOA was discussed respectively. The simulation model can be applied in parameter and operation condition optimization of SOAs in order to improve their femtosecond dynamic characteristics.