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采用耦合模微扰理论推导了旋转磁光布拉格光纤光栅(MFBG)的耦合模方程,利用打靶法数值分析了旋转导致的折射率变化对光栅光谱旁峰的影响,得到了与文献一致的结果。提出“磁圆相关损耗”的概念,并用于分析旋转磁光光纤光栅的磁场敏感性。研究表明,高速旋转(或各向同性)MFBG的磁圆相关损耗特性具有最佳的磁场敏感性;而适当低速旋转的MFBG可获得更高的磁圆相关损耗峰值,有助于提高光栅磁场敏感性的测量精度。与“偏振相关损耗”方法相比,“磁圆相关损耗”方法对线双折射的依赖性更小,理论分析也更简便。
The coupled mode equations of the rotating magneto-optical Bragg grating (MFBG) are deduced by the coupled-mode perturbation theory. The influence of the refractive index change caused by the rotation on the spectral peak next to the grating is analyzed numerically. The results are consistent with the literature. Proposed the concept of “magnetic-related loss” and used it to analyze the magnetic field sensitivity of the rotating magneto-optical fiber grating. The results show that the MFD of the high-speed rotating (or isotropic) MFBG has the best magnetic field sensitivity, while the MFBG which rotates at a proper low speed can obtain a higher peak value of the magnetic-circle-related loss and help to improve the sensitivity of the grating magnetic field Sexual measurement accuracy. Compared with the “polarization-dependent loss” method, the “magnet-dependent loss” method has less dependence on the line birefringence and is easier to analyze theoretically.