掺铒光纤环形腔中呼吸脉冲的产生  

Generation of Breathing Pulses in Erbium-Doped Fiber Ring Cavity

作　　者：龚旭光 王娟芬 金园 陈杰 杨玲珍 GONG Xu-guang;WANG Juan-fen;JIN Yuan;CHEN Jie;YANG Ling-zhen(College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学物理与光电工程学院,山西太原030024

出　　处：《量子光学学报》2022年第3期231-239,共9页Journal of Quantum Optics

基　　金：国家自然科学基金(61675144,61975141,62105232)。

摘　　要：本文基于Peregrine孤子,数值研究掺铒光纤环形腔中呼吸脉冲的产生及其演化特性。Peregrine孤子是一个具有时空局域性的高峰值单脉冲。由于背景波与孤子的相互作用,Peregrine孤子在单模光纤中传输发生分裂。为了产生长距离传输的高峰值脉冲,就需要消除背景波。本文采用掺铒光纤环形腔的方案来消除背景波的影响。掺铒光纤环形腔由单模光纤,掺铒光纤和光纤耦合器组成。通过控制环内单模光纤和掺铒光纤长度,使腔内色散达到近零色散,实现色散管理。研究表明,由于呼吸脉冲的峰值强度与Peregrine孤子的初始输入有关。为了获得高峰值的呼吸脉冲,选取Peregrine孤子在最大激发位置处的脉冲作为光纤环的初始输入。在光纤环的作用下,Peregrine孤子在近零色散环形腔中可以产生长距离传输的高峰值呼吸脉冲,而背景波逐渐演化成小的旁瓣脉冲。另外,高峰值呼吸脉冲的传输特性与色散、非线性和小信号增益有关。净腔色散在[-0.0010,0.0037]ps~2范围之内,可以产生长距离传输的高峰值呼吸脉冲。随着非线性系数的增加,呼吸脉冲的峰值强度增加,峰值振荡频率加快,振荡幅度也增加。当非线性系数增加到一定程度,局域呼吸脉冲逐渐形成。而小信号增益越大,呼吸脉冲的峰值强度越高,但振荡幅度和振荡频率影响较小。Based on the Peregrine soliton,the generation and evolution characteristics of breathing pulse in Erbium-doped fiber ring cavity are numerically studied in this paper.Peregrine soliton is a single high-peak pulse which is localized in both time and space.However,due to the interaction between the background wave and the soliton,Peregrine soliton splits into multiple sub-pulses in a single-mode fiber.In order to generate high-peak pulses for long-distance transmission,the background wave needs to be eliminated.In this paper,the Erbium-doped fiber ring cavity is used to eliminate the effect of background wave.The Erbium-doped fiber ring cavity is composed of single-mode fiber,Erbium-doped fiber and optic couplers.By controlling the lengths of the singlemode fiber and the Erbium-doped fiber in the ring,the intra-cavity dispersion can reach nearly zero dispersion,and the dispersion management can be realized.The results show that the peak intensity of breathing pulse is related to the initial input of the Peregrine soliton.In order to obtain a high-intensity breathing pulse,the pulse of PS at the maximum excitation position is selected as the initial input of the fiber ring cavity.Under the action of the fiber ring cavity,the high-peak breathing pulses can be obtained and transmitted for a long distance in the Erbium-doped fiber ring cavity when the intracavity dispersion is near zero dispersion.And the background waves on both sides of the PS gradually evolve into small side lobes.The transmission characteristics of high peak breathing pulses are related to dispersion,nonlinear effects and small signal gain.High-peak breathing pulses can be generated when the net cavity dispersion is in the range[-0.0010,0.0037]ps~2.As the nonlinear coefficient increases,the peak intensity of breathing pulses increases,and the amplitude and frequency of oscillation increase.When the nonlinear coefficient increases to a certain extent,the local breathing pulse is gradually formed.With the increase of the small signal gain,the peak in

关 键 词：呼吸脉冲 光纤环形腔 Peregrine孤子 非线性薛定谔方程 

分 类 号：O437[机械工程—光学工程]