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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 d B光纤耦合器构成的MachZehnder光纤干涉仪不能稳定工作的问题。
The Mach-Zehnder Fiber Interferometer (MZI) is an instrument made using the principle of optical interference and has the advantages of small size, light weight, compact structure, high resistance to electromagnetic interference and high sensitivity. However, the Mach-Zehnder fiber optic interferometer is a non-equilibrium parallel structure that is susceptible to instability due to environmental factors. Therefore, high-performance measurement systems and communication systems put strict requirements on the stability of the optical fiber interferometer. A stable control system of Mach-Zehnder interferometer based on 3 dB fiber coupler is proposed. Its purpose is to modulate the output signal of the detector and feedback it to one arm of the fiber interferometer for bias control. Thus realizing the stable work of Mach-Zehnder optical fiber interferometer. The method is simple and overcomes the problem that the MachZehnder optical fiber interferometer composed of the existing 3 d B fiber coupler can not work stably.