用于光学陀螺仪的基于无源非互易偏振技术的相位偏置系统
Phase Biasing System for Optical Gyroscope Using Passive Non-Reciprocal Polarization Techniques
AI总结：
提出一种基于无源非互易偏振移相器的干涉式光纤陀螺仪，首次实现双正交点无源偏置，消除有源调制，ARW值降低达40倍，提升灵敏度与长期稳定性。
摘要：
干涉式光纤陀螺仪（IFOG）因其高灵敏度、坚固性和固态特性而被广泛应用于精密导航系统中。为确保线性响应和准确的角速度测量，通常使用有源调制组件在顺时针（CW）和逆时针（CCW）光束之间引入固定的 $π/2$ 相位偏置。然而，这些有源元件增加了系统复杂性、功耗、成本，并且容易受到热漂移和长期退化的影响。在这项工作中，我们提出了一种新颖的IFOG配置，据我们所知，该配置首次实现了在两个正交工作点（$π/2$ 和 $3π/2$）的同时运行，无需依赖有源组件即可提供自然的噪声抑制。这是通过集成一个非互易偏振相关移相器（NRPPS）实现的，该移相器引入了纯 $π/2$ 的无源相移。我们详细介绍了光学架构，并使用琼斯演算提供了理论建模，以演示NRPPS元件如何引入无源正交偏置。仿真结果表明，所提出的NRPPS-IFOG实现了显著提高的灵敏度，其角度随机游走（ARW）值比传统IFOG低达40倍，具体取决于光纤线圈长度。该设计还利用了正交相位信号检测和光电探测器之间可调节的时间偏移来增强噪声抑制。这种无源偏置方法消除了对有源调制的需求，从而降低了功耗、提高了稳定性并增强了长期可靠性。
英文摘要：
Interferometric Fiber Optic Gyroscopes (IFOGs) are widely used in precision navigation systems due to their high sensitivity, robustness, and solid-state nature. To ensure linear response and accurate angular velocity measurement, a fixed $π/2$ phase bias is typically introduced between the clockwise (CW) and counter-clockwise (CCW) beams using active modulation components. However, these active elements increase system complexity, power consumption, cost, and susceptibility to thermal drift and long-term degradation. In this work, we present a novel IFOG configuration that, to the best of our knowledge, achieves for the first time, simultaneous operation at two quadrature points ($π/2$ and $3π/2$), providing natural noise suppression without relying on active components. This is made possible through the integration of a Non-Reciprocal Polarization-Dependent Phase Shifter (NRPPS), which introduces a pure $π/2$ passive phase shift. We detail the optical architecture and provide theoretical modeling using Jones calculus to demonstrate how the NRPPS element introduces passive quadrature biasing. Simulation results show that the proposed NRPPS-IFOG achieves significantly improved sensitivity, with Angular Random Walk (ARW) values up to 40x lower than those of conventional IFOGs, depending on the fiber coil length. The design further leverages quadrature-phase signal detection and adjustable temporal offsets between photodetectors to enhance noise suppression. This passive biasing approach eliminates the need for active modulation, offering reduced power consumption, improved stability, and enhanced long-term reliability.
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