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根据分段均匀模型分析了非均匀磁光光纤光栅(MFBG)与相应非磁性光栅的等效性,从而可直接利用OptiSystem仿真软件研究非均匀MFBG的光谱特性。在此基础上,深入研究了基于非均匀MFBG的Michelson干涉结构,分析了相位补偿法用于磁场测量的工作原理。仿真结果表明,线性啁啾MFBG的磁场灵敏性高于均匀和切趾MFBG的情形;优化MFBG的线性啁啾系数,可有效提高磁场灵敏度。所给出的OptiSystem仿真模型不但有助于Michelson干涉结构的设计,而且可以用于分析Mach-Zehnder干涉磁场的灵敏性。
According to the piecewise uniform model, the equivalence of non-uniform magneto-optical fiber grating (MFBG) and corresponding non-magnetic grating is analyzed. The spectral characteristics of non-uniform MFBG can be directly studied by OptiSystem simulation software. On this basis, the Michelson interference structure based on non-uniform MFBG is deeply studied, and the working principle of phase compensation method for magnetic field measurement is analyzed. The simulation results show that the MFBG of linear chirp is more sensitive to the magnetic field than the MFBG of uniform and apodized MFBG. Optimizing the linear chirp coefficient of MFBG can improve the sensitivity of the magnetic field effectively. The OptiSystem simulation model given is not only helpful for the design of Michelson interference structure, but also can be used to analyze the sensitivity of Mach-Zehnder interference magnetic field.