基于光纤Sagnac干涉仪的高精度宽谱光源平均波长测量技术

High precision measurement of broadband optical wavelength based on fiber optic sagnac interferometer

精确测量宽谱光源平均波长对研制高精度光纤陀螺具有重要意义。提出了一种高精度宽谱光源平均波长测量方法。采用全保偏Sagnac环形干涉仪实现宽谱光信号的干涉,采用微弱相位信号检测技术实现光波长信息的提取。推导出了宽谱光平均波长的数学模型,提出了光路设计方案和信号处理方案,提出了不敏感Sagnac效应的四态方波偏置调制单边解调的波长检测算法。精度分析表明该方案可以实现高精度的宽谱光源平均波长测量。设计了基于FPGA的微弱信号检测电路实现±π/2±3π/2四态方波偏置调制单边解调加闭环反馈算法,验证了该测量方法的可行性。

Precise measurement of broadband optical signal wavelength is important for high precision FOG A method of high precision measurement of broadband optical signal average wavelength is promoted. Based on the theory, an optical interferometer is designed; the signal processing solution and detection algorithm are promoted. The precision of the solution is proved to be high. A weak signal detection circuit is designed to realize the algorithm. Experiment result indicates the solution is feasible.