高阶效应对级联压缩脉冲的影响

The Influences of Higher Order Effects on the Cascade Compressed Optical Pulse

利用数值模拟的方法,研究三阶色散、自陡峭、自频移等高阶非线性效应对孤子压缩系统所产生的级联压缩脉冲的影响,发现三阶色散、自陡峭和自频移这三种高阶效应都会破坏压缩脉冲的传输行为.具体表现为:三阶色散会使孤子的压缩效应逐步消失并发生畸变,导致非对称振荡结构发生;自陡峭和自频移效应会导致脉冲破裂,最终使脉冲变形.这些结果表明,当脉冲被压缩到飞秒量级时,会导致脉冲畸变,从而出现失真,这在实际的光孤子通信中是十分不利的.

By the numerical simulation, the influences of higher order effects, such as dispersion, self- steepening and self-frequency effects, on the compressed soliton pulse produced by the cascade compression system are studied. It is found that the higher-order nonlinear effects badly influence the transmission of the compressed soliton pulse. The three-order dispersion effect can lead to the deformation of the compressed soliton pulse due to occurrence of anti-symmetrical disturbance, while the self-steepening and the self-frequency effects result in the split of the compressed soliton pulse, and eventually distort the profile of the pulse. The results show that when pulse is compressed to picosecond or femtosecond regime, the deformation of the compressed soliton pulse occurs, which is a disadvantage for the propagation of the signal in optical soliton communication.