A theory for nonreciprocal phase shift caused by cross coupling generated in a polarization maintaining (PM) fiber optic gyroscope (FOG) under the combined action of magnetic and temperature fields is proposed. The magnetic-thermal coupling in the FOG originates from the interaction of the magnetic field, fiber twist, birefringence caused by thermal stress, and the intrinsic and bending birefringence of the fiber. The cross coupling changes with temperature. When the PM fiber has a diameter of 250 μm, beat length of 3 mm, length of 500 m, twist rate of 1 rad/m, and optical source wavelength of 1310 nm, the maximum degree of magnetic-thermal coupling generated by a 1 mT radial magnetic field within the temperature range of -20℃ to 60℃ is -5.47%.
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机译：提出了一种在磁场和温度场的共同作用下，由偏振保持（PM）光纤陀螺仪（FOG）中产生的交叉耦合引起的不可逆相移的理论。 FOG中的磁热耦合源于磁场，光纤扭曲，由热应力引起的双折射以及光纤的固有和弯曲双折射的相互作用。交叉耦合随温度变化。当PM光纤的直径为250μm，拍长为3 mm，长度为500 m，扭曲速率为1 rad / m，光源波长为1310 nm时，由1产生的最大磁热耦合度在-20℃至60℃的温度范围内，mT径向磁场为-5.47％。
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