光纤激光器中矩形类噪声多脉冲的行为研究  

Research on multi-pulse behaviors of rectangular noise-like pulse in fiber laser

作　　者：李凯芯 汪徐德[1] 陆梦想 耿旭 LI Kaixin;WANG Xude;LU Mengciang;GENG Xu(School of Physics and Electronic Information,Huaibei Normal University,235000,Huaibei,Anhui,PRC)

机构地区：[1]淮北师范大学物理与电子信息学院,235000,安徽省淮北市

出　　处：《曲阜师范大学学报（自然科学版）》2024年第1期83-88,共6页Journal of Qufu Normal University(Natural Science)

基　　金：安徽省自然科学基金(2008085MF211);安徽省光通信技术基础教学示范课(2020SJJXSFK2140);安徽省研究生联合培养示范基地(2022lhpysfjd046)。

摘　　要：报道了基于非线性光纤环形镜(NOLM)锁模的掺铒光纤激光器中矩形类噪声多脉冲演化行为.在基频重复率为2.19 MHz下,可以获得稳定的矩形类噪声脉冲,脉冲宽度从1.25 ns到4.35 ns可调,单脉冲能量可达7.72 nJ.通过改变泵浦功率和偏振状态,矩形类噪声可分裂成多脉冲,并随着腔参数的不同演化成多种形态,如脉冲间距不等的矩形类噪声脉冲簇,脉冲间距相等的矩形类噪声脉冲簇以及各阶谐波类噪声脉冲.实验结果表明,类噪声脉冲具有与孤子脉冲类似的脉冲分裂特性,并随着腔内脉冲数的增加,单个矩形类噪声脉冲宽度逐渐减小.实验结果有助于进一步理解矩形类噪声脉冲的产生机理与多脉冲的动力学特性.This paper reports various multi-pulse behaviors of rectangular noise-like pulses(NLPs)generated in a passively mode-locked Erbium-doped fiber laser based on a nonlinear optical loop mirror(NOLM).Under the fundamental frequency of 2.19 MHz,the stable NLP is obtained.The pulse duration broadens from 1.25 ns to 4.35 ns,and the energy of a single pulse reaches 7.72 nJ.By changing the pump power and the polarization state,the rectangular NLP can split multiple pulses and exhibit various behaviors under different cavity parameters,such as rectangular NLP clusters with irregular or regular pulse spacing,and different order harmonically mode-locked NLPs.The experimental results indicate that the NLP possesses a splitting characteristic similar to conventional soliton.The single pulse duration is gradually decreased with the increase of pulse number within pulse clusters.The finding facilitates a better understanding of the generation mechanisms of the rectangular NLP and the dynamic characteristics of multiple pulses.

关 键 词：光纤激光器 类噪声 矩形脉冲 多脉冲 非线性光纤环形镜 

分 类 号：TN248[电子电信—物理电子学]