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采用高双折射光纤Sagnac环作为布拉格光栅(FBG)波长解调器,为消除温度变化引起的测量误差,研究了一种基于参考光的Sagnac环双差动滤波器。介绍了Sagnac环双差动滤波器工作原理,给出了滤波器输出双差动信号的数学表达式。理论分析了双差动滤波器的传输特性和波长解调特性,并进行实验验证。理论分析和实验测试的结果均表明,与常规Sagnac环边缘滤波解调方法相比,本文的双差动滤波解调方法具有更高的灵敏度、更好的线性特性和温度稳定性,温度引起解调装置的测量误差从1.38nm/℃降低到1×10-3 nm/℃,温度稳定性提高了3个数量级。
A high birefringence fiber Sagnac ring was used as a Bragg grating (FBG) wavelength demodulator. To eliminate the measurement error caused by temperature variation, a Sagnac ring double differential filter based on reference light was studied. The working principle of the Sagnac ring double differential filter is introduced, and the mathematical expression of the double differential signal output by the filter is given. Theoretical analysis of the transmission characteristics of the double differential filter and wavelength demodulation characteristics, and experimental verification. Theoretical analysis and experimental results show that, compared with the conventional Sagnac ring edge filter demodulation method, the dual-differential filter demodulation method in this paper has higher sensitivity, better linearity and temperature stability, temperature-induced solution The measurement error of the tuning device is reduced from 1.38nm / ℃ to 1 × 10-3nm / ℃, and the temperature stability is improved by 3 orders of magnitude.