摘要
本文基于变系数Hirota方程的呼吸子解,研究了色散渐减光纤系统中高功率脉冲串的产生及传输特性。当二阶色散取指数形式,随着传输距离的增大呼吸子能够形成稳定传输的高功率脉冲串,且高功率脉冲串稳定的位置与色散系数的调制强度和衰减系数密切相关。此外,研究了三阶色散对高功率脉冲串产生的影响。选取适当形式的三阶色散不会影响高功率脉冲串的产生,但会影响高功率脉冲串的偏移程度及偏移方向。最后,在增益损耗存在的情况下,研究了高功率脉冲串在传输过程中振幅的变化。以上结果表明,通过调整参数能够实现对高功率脉冲串的操控,为光通信在实际中的应用提供了一定的理论指导。
In optical fibers, the nonlinear Schr?dinger equation is a theoretical model for studying Akhmediev breather dynamics.Due to the material and characteristics of the fiber itself, including the variable-coefficients into the nonlinear Schr?dinger equation is an effective method to reflect the non-uniform effects of nonlinear pulses. Based on the exact solution of the variable-coefficients Hirota equation, it studies the generation and transmission characteristics of the high-power pulse train in dispersion exponentially decreasing fiber in this paper. When the second-order dispersion takes the exponential form, breather can evolve into high-power pulse train with the increase of transmission distance that can propagate stably and the position zcof the stable high-power pulse train is closely related with the modulation intensity β;and the attenuation index δ of the dispersion coefficient. The results show that the position zcof the stable high-power pulse train increases with the increase of parameter β;and decreases with the increase of parameter δ. Therefore, the stable high-power pulse train can be formed at any position by adjusting the parameters β;and δ.In addition, the effect of the third-order dispersion on the high-power pulse train is discussed. It shows that the appropriate form of third-order dispersion does not affect the formation of high-power pulse train, while it affects the deviation degree and direction of the high-power pulse train. Finally, in the presence of gain or loss, the amplitude variations of the high-power pulse train during the propagation are studied. The results show that it can control the high-power pulse train by adjusting the parameters providing theoretical guidance for the application of optical communications in practice.
作者
王艳
秦文帅
王楠
WANG Yan;QIN Wen-shuai;WANG Nan(College of Physics&Electronics Engineering,Shanxi University,Taiyuan 030006,China)
出处
《量子光学学报》
北大核心
2022年第1期28-36,共9页
Journal of Quantum Optics
基金
国家自然科学基金(11705108)。
关键词
变系数
三阶色散
高功率脉冲串
增益损耗
variable-coefficients
third-order dispersion
high-power pulse train
gain and loss
