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通过对低双折射非线性相干耦合模传输方程引入斯托克斯参量表达式,利用庞加莱球图示法,分析了非线性相干耦合波在低双折射光纤中偏振态的衍化规律,并运用相图法数学几何法给出了双折射差与偏振不稳定性的关系,临街功率表达式。当两个运动常量满足关系时,偏振态围绕庞加莱球上的P1,P2稳定点旋转的闭合曲线衍化,并呈现椭圆偏振态;当两个运动常量满足关系时,出现保偏现象;当两个运动常量满足关系时,偏振态围绕P1,P3稳定点旋转的闭合曲线衍化。
By introducing the Stokes parameter expression into the low birefringence nonlinear coherently coupled mode transfer equation and using the Poincare sphere representation, the law of polarization of the nonlinear coherent coupled wave in the low birefringent fiber is analyzed. The relationship between birefringence and polarization instability and the street power expression are given by the mathematical method of phase diagram method. When the two motion constants satisfy the relationship, the polarization state is derived around the closed curve of the rotation of the P1 and P2 stable points on the Poincare sphere and takes on an elliptic polarization state. When the two motion constants satisfy the relationship, the polarization maintaining phenomenon occurs. When When two motion constants satisfy the relationship, the closed curve derived from the rotation of polarization around the stable points P1 and P3 is derived.