非偏振保持光纤中随机双折射对自俘获现象的影响

The Self-Trapping Phenomenon Influenced by Random Birefringence in Non-Polarization Holding Fibers

本文用数值计算的方法解非线性耦合薛定谔方程 ,研究了在非偏振保持光纤中随机双折射变化对孤子自俘获传输现象的影响。研究结果表明 :相对于具有保偏特性的强双折射光纤 ,非偏振保持光纤中随机双折射所致的 2个模式间频繁的能量交换 ,减缓了 2脉冲的走离 ,有利于束缚态的形成 ;入射偏振角 θ对孤子的自俘获传输影响非常小 ,这就使光孤子耦合进光纤时不须鉴别光纤的快、慢轴。

In this paper, the influence of random varying birefringences on soliton self-trapping transmission in non-polarization holding fibers is studied by numerically calculating the nonlinear coupling Schrodinger equation. The results show that the frequent energy commute induced by random birefringence in non-polarization holding fibers defers the walk-off of the pulses in two polarization directions and makes for the formation of the bound state. Besides, the effect of the input polarization angle θ on the propagation of soliton's self-trapping is very small, so an identification of the slow and fast axes is unnecessary when the optical soliton is launched into the fibers.