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提出了磁光光纤Bragg光栅的理论模型,给出了圆偏振光在磁光光纤光栅中传播的非线性耦合模方程.研究表明,在磁光光纤Bragg光栅中,光栅引起正反传播方向的导波光发生耦合,法拉第效应引起磁圆双折射效应,而非线性效应则将左旋和右旋圆偏振光耦合在一起,它们的共同作用可使双稳态状态发生反转、非线性光控光开关阈值功率降低.与传统光纤光栅相比,利用左旋和右旋磁圆偏振光之间的交叉相位调制实现的脉冲整形具有磁光偏置可调特性,为基于磁光光纤光栅的动态灵活全光3R再生器的研制提供了理论基础.
The theoretical model of the magneto-optical fiber Bragg grating is proposed and the nonlinear coupled mode equation of the circularly polarized light propagating in the magneto-optic fiber grating is given. The results show that in the magneto-optic fiber Bragg grating, the grating leads the forward and backward propagation directions Wave coupling occurs, the Faraday effect causes a circular birefringence effect, while the non-linear effect couples left-handed and right-handed circularly polarized light together, and their mutual action reverses the bistable state. The nonlinear optical optical switch The threshold power is reduced.Compared with the traditional FBG, pulse shaping using the cross-phase modulation between L-clockwise and right-handed circularly polarized light has the characteristic of magneto-optic bias adjustment, 3R regenerator provides a theoretical basis for the development.