Coexistence of noise-like pulse and dark pulse in an Er/Yb co-doped fiber laser

作     者：李婧 王春灿 王鹏 Jing Li;Chuncan Wang;Peng Wang

作者机构：Key Laboratory of All Optical Network and Advanced Telecommunication NetworkMinistry of EducationInstitute of Lightwave TechnologyBeijing Jiaotong UniversityBeijing 100044China 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2024年第22卷第5期

页      面：68-74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：This work was supported by the National Natural Science Foundation of China(NSFC)(No.61575018) 

主　　题：coexistence state mode-locked fiber laser Sagnac loop tunable wavelength 

摘      要：The coexistence of a noise-like pulse(NLP)and a dark pulse was experimentally demonstrated in a net-anomalous dispersion Er/Yb co-doped fiber(EYDF)laser,for the first time,to our *** cavity was mode-locked by nonlinear polarization rotation(NPR)***,a Sagnac loop with a section of polarization-maintaining fiber(PMF)was used as a comb filter to enable multiwavelength pulse *** the PMF length was 0.3 m,an asymmetric two-peak spectrum with central wavelengths of 1565.3 and 1594.2 nm was obtained by adjusting polarization controllers(PCs).It is a composite state of NLP and dark pulse due to the cross-phase modulation between the two different wavelength components along orthogonal polarization *** two pulses are synchronized with a repetition rate of 7.53 *** adjusting the PC in the Sagnac loop,the spectral ranges of NLPs and dark pulses can be tuned from 1560 to 1577.8 nm and from 1581.8 to 1605.4 nm,*** addition,the pulse characteristics were investigated by incorporating the PMF with different lengths,where the coexistence patterns can be generated when the PMF lengths were 0.2 and 0.3 m.A longer PMF can lead to a narrowband comb filtering,which causes a larger loss and is not favorable for stable operation of the coexistence *** fiber laser demonstrates an interesting operation regime and has significant potential for numerous practical applications.