Generation of switchable multiwavelength solitons with wide wavelength spacing at 2  μm

We demonstrated an all-fiber multiwavelength mode-locking thulium-doped fiber laser employing a cascaded single-mode step-index multimode-graded-index multimode single-mode-fiber (SMF-SIMF-GIMF-SMF) saturable absorber (SA). Based on the linear and nonlinear multimode interference effect of the propo...

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Bibliographic Details
Published inOptics letters Vol. 44; no. 10; p. 2442
Main Authors Li, Huanhuan, Hu, Fangming, Li, Can, Tian, Ying, Huang, Changqing, Zhang, Junjie, Xu, Shiqing
Format Journal Article
LanguageEnglish
Published United States 15.05.2019
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Summary:We demonstrated an all-fiber multiwavelength mode-locking thulium-doped fiber laser employing a cascaded single-mode step-index multimode-graded-index multimode single-mode-fiber (SMF-SIMF-GIMF-SMF) saturable absorber (SA). Based on the linear and nonlinear multimode interference effect of the proposed device, this structure can act both as a filter and as a SA. A stable triwavelength (1857/1897/1934 nm) mode-locking operation with the adjacent wavelength interval of approximately 40 nm was obtained. The triwavelength mode locking can also be quickly switched either pair-by-pair or one-by-one by adjusting the polarization controller properly. Our results indicate that the SMF-SIMF-GIMF-SMF structure provides a simpler and more compact solution for switchable multiwavelength mode locking in fiber lasers.
ISSN:1539-4794
DOI:10.1364/OL.44.002442