为了研究集成双波导半导体光放大器(ITG-SOA)小信号放大纵向特性,运用ITG-SOA静态分析模型进行了分析.结果表明,小信号放大时,ITG-SOA有源和无源波导间能够实现周期性光功率转移和完全的功率交换；与半导体光放大器中载流子浓度沿纵向单调下降明显不同,ITG-SOA有源波导中的载流子浓度沿纵向周期性摆动,且摆动幅度沿纵向逐渐加大；有源波导归一化层厚度、有效折射率和纵向传播常数等特性参量亦呈现出特有的纵向分布.这一结果对于深刻理解ITG-SOA小信号放大时的工作机理是有帮助的.%In order to investigate the longitudinal characteristics under small signal amplification of an integrated twin-guide semiconductor optical amplifier ( ITG-SOA) , a comprehensive ITG-SOA static model was utilized for analysis. Theoretical analysis reveals the optical power transfer between the active and passive waveguides of ITG-SOA is periodic and complete. Differing prominently from the decreasing monotonously of the carrier density along the propagation direction in SOA, the carrier density in the active waveguide of ITG-SOA swings periodically, whose amplitude increases gradually along the propagation direction. The normalized layer thickness, effective refractive index and longitudinal propagation constant in the active waveguide also present particular longitudinal distribution. This result is helpful for deeply understanding the working mechanism of ITG-SOA under small signal amplification.
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