随着高速光通信网络的发展，超长距离的光纤信号传输使得光信号偏振态调控成为人们关注的研究重点之一，其中补偿偏振模色散（PMD）对于光信号的影响是偏振控制的一项主要内容。 本文基于InGaAsP/InP的多模干涉（MMI）器件设计了偏振控制器，研究工作主要从以下两个方面展开： (1)模拟了偏振控制所需要的各部分器件，包括TM/TE分束器、偏振旋转器和包含相移器的功率耦合器。 (2)通过组合这三种器件实现了对入射信号光偏振态的任意控制，设计出了可以任意变换入射信号偏振态，并且以任意比例分束的偏振控制器。

Along with the fast development of the high speed optical networks, the long-distance transmission shows that the control of the state of polarization(SOP) in the networks plays an important role, so does the PML that SOP brings in. This design uses the MMI tech based on InGaAsP/InP to make a polarization controller, and the research work begins from the two parts below: (1) Separately give out the simulation of all the parts that make up a PC, including TM/TE polarization beam splitter, polarization rotator, phase shifter and power coupler. (2)To realize the free control of the SOP of the incident signal by the combination of the devices above.