不同相位调制波形对背向散射噪声的抑制

发布时间：2018-07-17 05:22

【摘要】：谐振式光纤陀螺系统中,背向散射噪声成为制约其系统精度的重要因素之一.对陀螺双路系统其中一路光波信号进行研究,利用相位调制频谱展开及光场叠加的方法,对光纤环形谐振腔输出光场进行理论分析.理论上载波分量的出现会在系统中引入背向散射噪声,因此仿真分析引入载波分量的幅度,得到采用三角波调制比正弦波更有利于抑制载波分量.以抑制载波分量为目标,搭建自外差载波抑制测试平台,对相位调制器施加三角波与正弦波两种波形调制,得到采用三角波调制时载波抑制比最高可达64.3dB,比正弦波调制时高出6dB,与理论分析相符;在陀螺系统应用中,采用三角波调制时陀螺输出信号载波抑制程度更大,波动更小,更加稳定.
[Abstract]:In the resonant fiber optic gyroscope system, the backscatter noise is one of the important factors that restrict the precision of the system. A study on the optical wave signal of the gyroscopic dual circuit system is made. The theoretical analysis of the output light field of the optical fiber ring resonator is made by the method of phase modulation spectrum expansion and light field superposition. The emergence of the carrier component in theory will be in theory. The backscatter noise is introduced in the system, so the amplitude of carrier component is introduced in simulation analysis. It is found that triangular wave modulation is more beneficial to suppress carrier component than sinusoidal wave. In order to suppress carrier component, a self heterodyne carrier suppression test platform is built, and two waveforms of triangular wave and sinusoidal wave are added to the phase modulator. The carrier suppression ratio of the triangular wave modulation is up to 64.3dB, which is higher than the sine wave modulation (6dB), which is in accordance with the theoretical analysis. In the application of the gyroscopic system, the carrier suppression of the gyro output signal is greater, the fluctuation is smaller and more stable when the triangular wave modulation is used.
【作者单位】：中北大学仪器科学与动态测试教育部重点实验室;电子测试技术重点实验室;
【基金】：国家自然科学基金(Nos.91123036,61178058,61275166);国家自然科学基金项目科学仪器基础研究(No.61127008)资助国家杰出青年基金(No.51225504)
【分类号】：TN966

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