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在相干光通信等方面，要求信号光与本地振荡光偏振方向相匹配，这就要求对偏振进行控制。本文介绍了至今国外出现的有关偏振问题的四类解决方案，重点介绍了其中的偏振控制器原理，最后对各种偏振解决方案作了比较并指出了应用前景。
In coherent optical communications, etc., the signal light is required to match the polarization direction of the local oscillator light, which requires the control of the polarization. In this paper, we introduce four types of solutions to polarization problems that have appeared in foreign countries so far, and introduce the principle of polarization controller. Finally, we compare the solutions of various kinds of polarization and point out the application prospects.