Li Ang, Jing Zhenguo, Liu Qiang, Liu Yueying, Cheung Yang, Huang Zhiyuan, Zhou Da-Peng, Peng Wei
Opt Lett. 2021 Apr 1;46(7):1502-1505. doi: 10.1364/OL.421012.
We present a novel, to the best of our knowledge, white light interferometric fiber-optic gyroscope (IFOG) scheme using a fiber-optic rhombic optical path difference (OPD) bias structure to interrogate with a sensing coil to realize rotation rate measurement without a phase modulator. The OPD bias structure composed of four (2×1) 3 dB single-mode fiber couplers was constructed to implement non-reciprocal OPD bias. White light interferometric demodulation was utilized to acquire the change in OPD due to the Sagnac-phase shift. Absolute linear output can be obtained. We produced the principle prototype of rhombic OPD bias white light IFOG without utilizing a phase modulator. An experimental demonstration of the IFOG prototype system achieves linear output with respect to the OPD difference in detecting rotation rate.
据我们所知，我们提出了一种新颖的白光干涉光纤陀螺仪（IFOG）方案，该方案使用光纤菱形光程差（OPD）偏置结构与传感线圈进行互作用，以在不使用相位调制器的情况下实现旋转速率测量。由四个（2×1）3 dB单模光纤耦合器组成的OPD偏置结构被构建用于实现非互易OPD偏置。利用白光干涉解调来获取由于萨格纳克相移引起的OPD变化。可以获得绝对线性输出。我们制作了不使用相位调制器的菱形OPD偏置白光IFOG原理样机。IFOG原型系统的实验演示在检测旋转速率时实现了相对于OPD差的线性输出。
