Luo Rongya, Li Yulin, Deng Sheng, He Dong, Peng Chao, Li Zhengbin
Opt Express. 2017 Oct 30;25(22):26747-26759. doi: 10.1364/OE.25.026747.
Dual-polarization interferometric fiber optic gyroscope (IFOG) is a novel scheme in which the polarization nonreciprocal (PN) phase error of the two orthogonal polarizations can be optically compensated. In this work, we investigate the effective of PN phase error compensation under varying temperature. It is proved that, the thermally induced strain deforms the fiber, and results in perturbations on the birefringence and polarization cross coupling which degrades the IFOG's stability. A wave propagation model and analytical expressions of PN phase error are derived by using coupled-wave equation and Jones matrix. We theoretically and experimentally verify that, although the single-mode (SM) and polarization-maintaining (PM) fiber coils behave different owing to their intrinsic properties of wave propagation, the thermal strain induced PN phase error can still be compensated under slow and adiabatic temperature variations. This could be a promising feature to overcome the temperature fragility of IFOG.
双偏振干涉式光纤陀螺仪（IFOG）是一种新颖的方案，其中两个正交偏振的偏振非互易（PN）相位误差可以通过光学方式进行补偿。在这项工作中，我们研究了在温度变化时PN相位误差补偿的效果。结果表明，热致应变会使光纤变形，并导致双折射和偏振交叉耦合产生扰动，从而降低IFOG的稳定性。通过使用耦合波方程和琼斯矩阵，推导了PN相位误差的波传播模型和解析表达式。我们通过理论和实验验证了，尽管单模（SM）和保偏（PM）光纤线圈由于其波传播的固有特性而表现不同，但在缓慢和绝热温度变化下，热应变引起的PN相位误差仍然可以得到补偿。这可能是克服IFOG温度脆弱性的一个有前景的特性。
