Experimental investigation on evolution of a split multi-wavelength bright-dark pulse in a mode-locked thulium-doped fiber laser

作     者：WANG Xiaofa WANG Jie DUAN Xianyi WANG Xiaofa;WANG Jie;DUAN Xianyi

作者机构：Chongqing Key Laboratory of Photoelectronic Information Sensing and Transmitting TechnologySchool of Optoelectronic EngineeringChongqing University of Posts and TelecommunicationsChongqing400065China 

出 版 物：《Optoelectronics Letters》 (光电子快报（英文版）)

年 卷 期：2022年第18卷第12期

页      面：717-722页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 

基　　金：supported by the Natural Science Foundation of Chongqing City China (No.cstc2018jcyjAX0585) 

主　　题：pulse fiber pump 

摘      要：We report the experimental observation of evolving phenomenon of a split multi-wavelength bright-dark pulse in the nonlinear amplifying loop mirror(NALM)-based mode-locked thulium-doped fiber laser(TDFL) with a figure-eight configuration. Bright-dark pulse with 10 wavelengths was successfully obtained at the pump power of 3 W. The time interval between the bright and dark pulses was discovered not only increasing linearly with the pump power but also approximately equaling to the reciprocal of modulation frequency of radio frequency(RF) spectrum. Moreover, we also observed that the spectrum of split multi-wavelength bright-dark pulse can further present up to 13 wavelengths.