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温变条件下,对光纤光源发出光波经单模光纤耦合器传输后的输出光谱进行了测试;借助测试结果,仿真计算了耦合器的透射光波和耦合光波分别进入光纤陀螺后干涉仪输出信号的信噪比随温度的变化情况.结果表明:当环境温度发生变化时,耦合器透射光波和耦合光波的功率、波长和谱宽都会发生变化,且透射光波的功率、波长和谱宽的温度稳定性远高于耦合光波的稳定性;当耦合光波作为干涉仪输入光波时,由温变引起的光纤陀螺信噪比误差约是透射光波作为输入光波时的信噪比误差的4倍.
Under the condition of temperature change, the output spectrum of the light emitted by the fiber light source after being transmitted through the single-mode fiber coupler is tested. With the test results, the output signals of the interferometer after the transmitted light wave and the coupling light wave of the coupler enter the FOG The results show that when the ambient temperature changes, the power, wavelength and spectral width of the transmitted light and the coupled light will change, and the temperature of the power, wavelength and spectral width of the transmitted light will be stabilized When the coupling light wave is used as the input light wave of the interferometer, the signal-to-noise error of the fiber optic gyroscope caused by the temperature change is about 4 times the error of the signal-to-noise ratio of the transmitted light wave as the input light wave.