基于3dB光纤耦合器构成的Mach-Zehnder光纤干涉仪稳定控制系统

Mach-Zehnder光纤干涉仪（MZI）是一种利用光干涉原理制成的仪器，具有体积小、重量轻、结构紧凑、抗电磁干扰和灵敏度高等优点。但是，Mach-Zehnder光纤干涉仪是一种非平衡并行结构，易受环境等因素影响导致其性能不稳定。因此，高性能测量系统和通信系统对光纤干涉仪的稳定工作提出了严格的要求。提出了一种基于3 dB光纤耦合器构成的Mach-Zehnder干涉仪的稳定控制系统，其目的是通过对探测器的输出信号进行调制，并反馈到光纤干涉仪的一臂上进行偏置控制，从而实现Mach-Zehnder光纤干涉仪的稳定工作。该方法实现简单，克服了现有3 dB光纤耦合器构成的Mach-Zehnder光纤干涉仪不能稳定工作的问题。

Stability control system of fiber Mach-Zehnder interferometer based on 3 dB fiber coupler

Due to the advantages on small size, light-weight, compact structure, immunity electronmagetic interference and high sensitivity, fiber Mach-Zehnder interferometer has been considered in various applications. However, the abilization of the fiber Mach Zehnder interferometer has recently become the most important problem to the measurement and communication system with higher accuracy and performance, because its non balanced parallel structure. A stability control system of the fiber Mach-Zehnder interferometer was introduced,which was based on 3dB optical coupler. It was realize the stability control by bias control, the output signal of microwave photonic link feedback to one of the fiber Mach Zehnder interferometer arms. This simple method was effective to overcome the unstably problem of the fiber Mach-Zehnder interferometer which composed of 3dB fiber coupler.