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解调算法在Sagnac干涉仪系统中占有重要地位。目前已经提出的一些数字开环解调算法在运算过程中时常会出现某些特殊相位点互相混淆的问题,这会导致系统输出错误的解调结果。在对特殊相位点的产生原理进行理论分析的基础上,设计了一种以集成电路芯片为核心的虚拟光纤Sagnac干涉仪系统。该系统可以便捷地解决使用光纤Sagnac干涉仪难以对特殊相位点进行检测的问题,同时,可以方便地判别解调系统在这些特殊相位点是否会发生错误解调。最后,利用该虚拟Sagnac干涉仪对一种数模混合解调系统进行了特殊相位点测试。并通过实验测得该虚拟光纤Sagnac干涉仪的标度因数为49.9°/V;标度因数的非线性度为0.167%,标度因数的不对称度为0.088062%,零漂小9.5265°/h。
The demodulation algorithm plays an important role in the Sagnac interferometer system. Some digital open-loop demodulation algorithms that have been proposed so far often cause some special phase points to be confused with each other during the operation, which may cause the system to output erroneous demodulation results. Based on the theoretical analysis of the generation principle of special phase point, a virtual optical fiber Sagnac interferometer system based on integrated circuit chip is designed. The system can easily solve the problem that it is difficult to detect the special phase point by using the fiber Sagnac interferometer, and at the same time, it can be easily discriminated whether the demodulation system will demodulate erroneously at these special phase points. Finally, a special phase point test was performed on a hybrid digital-analog demodulation system using the virtual Sagnac interferometer. The scaling factor of the virtual optical fiber Sagnac interferometer is 49.9 ° / V. The nonlinearity of scale factor is 0.167%, the asymmetry of scale factor is 0.088062%, and the zero-drift is 9.5265 ° / h .