【摘要】 本文以一种离散、等间距的随机耦合模型来模拟实际单模光纤。从理论上证明了在具有随机耦合的单模光纤中,偏振度并不随光纤总长度的增加而趋向于零。数值计算表明偏振度的系综平均值随光纤总长度的增大将趋于一个非零的渐近值,此值与随机耦合强弱及光源谱宽、光纤双折射、耦合点的空间频率有关。更多还原

【Abstract】 A model for discrete mode-coupling centers with random coupling coefficients and equal intervals is proposed to simulate an actual single-mode optical fiber. The degree of polarization (DOP) in a single-mode fiber with random mode coupling has proved to be impossible to approach zero with increasing fiber length. Numerical results show that the ensemble average of DOP will approach a non-zero asymptotic value which depends on coupling intensity, light source spectrum, fiber birefringence and spatial frequency of the coupling centers.更多还原