多孤子和类噪声脉冲共存的锁模光纤激光器  

Mode-locked fiber laser with coexistence of m ultiple solitons and noise-like pulses

作　　者：杨亚涛 邹媛 曾琼[1] 宋宇锋[1] 王可[1] 王振洪 Yang Ya-Tao;Zou Yuan;Zeng Qiong;Song Yu-Feng;Wang Ke;Wang Zhen-Hong(College of Electronics and Information Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]深圳大学电子与信息工程学院,深圳518060

出　　处：《物理学报》2022年第13期191-198,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62005178);深圳市基础研究面上项目(批准号:JCYJ20190808143611709);深圳市基础研究计划项目(批准号:JCYJ20200109105216803)。

摘　　要：研究了非线性放大环形镜锁模掺铒光纤激光器中多孤子和类噪声脉冲同时产生的演化特性.当激光器运行在类噪声脉冲状态时,单个孤子簇里包含着多个不同间距的脉冲,同时相邻脉冲之间的脉冲间距均保持在数百皮秒的范围内,说明多孤子脉冲之间存在较弱的相互作用力.并且,单个孤子簇中的总脉冲数随着抽运功率的增大而增加.在最大的抽运功率时,单个孤子簇包络内部有8个脉冲.此外,利用时间拉伸色散傅里叶变换技术研究了这种类噪声多孤子脉冲的实时动力学演化特性,研究表明类噪声脉冲状态下的多孤子脉冲中每个脉冲实际上都是由随机强度的噪声混沌波组成的.这些研究结果将有助于深入理解类噪声脉冲的物理机制,也将为探索其他复杂孤子动力学过程奠定基础.Dissipative solitons(DSs)usually play an important role in understanding the intricate phenomena in various nonlinear systems.As a special regime in the dissipative system,noise-like pulses(NLPs)can have typical characteristics of ultra-broad and smooth spectrum,high pulse energy and low temporal coherence,making them a good candidate for many applications,including supercontinuum generation,industrial micromachining and optical metrology.In this paper,a noteworthy observation concerning the dynamics on coexistence of the multiple solitons and NLPs operation in a net-normal-dispersion passively mode-locked fiber laser based on nonlinear amplifying loop mirror(NALM)is reported.In the experiment,the stable DSs can be easily obtained at a proper pump power.When appropriately increasing the pump power and changing the polarization state,the DS operation can change to the NLP regime.When the fiber laser operates in an NLP state,the single soliton bunch contains multiple pulses with different temporal spacings.And the temporal interval between the adjacent pulses is in a range of several hundred picoseconds,which decreases from left to right with time changing,indicating that there are long-distance interactions among these multiple pulses and they gradually become stronger and stronger.Besides,the pulse number of single soliton bunches on the NLP operation increases almost linearly with pump power increasing.At a maximum pump power,there are eight pulses inside the single soliton bunch.With the increase of pump power,the average output power and pulse energy of these multiple solitons in the NLP state increase.The maximum average output power and pulse energy are 12.3 mW and 1.65 nJ,respectively.In addition,the real-time dynamic evolution of these multiple solitons in the NLP state is investigated by using the time-stretch dispersive Fourier-transform method.The results show that all the pulses in NLP regime actually consist of chaotic noise waves with stochastic intensities.We believe that this paper will be of signi

关 键 词：光纤激光器 多孤子 类噪声脉冲 色散傅里叶变换 

分 类 号：TN248[电子电信—物理电子学]