半导体光放大器的偏振光开关性能改进

半导体光放大器(SOA)非线性偏振旋转效应的光开关具有开关速度快、易集成等优点，其开关操作可以通过改变注入SOA中的电流而获得。这种偏振光开关的性能主要受注入光功率与控制电流的大小范围来决定。基于SOA中的偏振主态的概念，分析了非线性偏振旋转效应与控制电流的关系，并对不同功率的注入光进行了偏振旋转实验，分别实现了偏振光开关的操作。实验结果表明:随着注入光功率的增加可以提高光开关的分光比，有效改进光开关的性能。当注入光为5 dBm时，光开关的分光比与消光比均可达到30 dB。

Performance improvement of all-optical switching based on polarization rotation in semiconductor optical amplifier

All-optical switching based on nonlinear polarization rotation(NPR) effect in semiconductor optical amplifier(SOA) has a fast speed and is also integrated together easily.The optical switching operation can be achieved by the different currents of injecting SOA.The performance of this optical switching is also influenced by the input power and the electric current.In this paper,theoretical analysis of the relationship between NPR effect and control current was proposed.Experiments results of polarization rotation with different optical power injected were provided.The optical splitting ratio and extinction ratio were important factors of optical switching.The results show that with the increase of input power the splitting ratio was also increased which could effectively improve the capability of optical switching.In the experiments,an optical switching with high optical splitting ratio and extinction ratio of 30 dB is realized when optical power injected is 5 dBm.