Dark-bright pair between bright pulses in a multimodal interference-based Q-switched mode-locking fiber laser

Kailin Jia; Yue Zhao; Ying Qin; Guoqing Hu; Huiyu Li; Guangwei Chen; Zhehai Zhou

doi:10.1117/12.2687228

27 November 2023 Dark-bright pair between bright pulses in a multimodal interference-based Q-switched mode-locking fiber laser

Kailin Jia, Yue Zhao, Ying Qin, Guoqing Hu, Huiyu Li, Guangwei Chen, Zhehai Zhou

Author Affiliations +

Proceedings Volume 12760, Advanced Lasers, High-Power Lasers, and Applications XIV; 1276016 (2023) https://doi.org/10.1117/12.2687228
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

We demonstrate a Q-switched mode-locked Er-doped fiber laser using an all-fiber grade-index multimode fiber-based modulator which generates dark-bright pair between bright pulse sequences and alternate bright and dark pulses. A section of dispersion compensation fiber (Nufern UHNA4) considered as a candidate normal group victory dispersion fiber is used to adjust the net dispersion of cavity. At a pump power of 410 mW, evident Q-switched instability modulating mode-locked bright pulses are observed, and the duration of Q-switched envelope changes from 1.8 μs to 8 μs along with the variation of power. Changing the state of polarization controller, the mode-locked bright pulse train is tuned to dark pulse train with reducing the duration of Q-switched envelope to 1.2 μs. What’s more, dark-bright pair between bright pulses train and alternate bright and dark pulses are also observed under second harmonic operations with suitable PC states. Coupled complex Ginzburg-Landau equation, field coupling model for propagation in multimode fiber, and fiber nonlinear effects are provided to reveal the underlying principles of the transition of these pulse trains. Because of the principal modes and filtering effect in multimode fibers, the formation and stable propagation of the dark-bright pair are precisely achieved. At the same time, the physical mechanism behind the unusual pairing of dark and bright pulses is that under certain conditions, cross-phase modulation can counteract the time extension of optical pulses caused by the combination of self-phase modulation and normal dispersion. Thus, the cross-phase modulation induced chirping on dark solitons enables dark-bright pair between bright pulse sequences to coexist.

Citation Download Citation

Kailin Jia, Yue Zhao, Ying Qin, Guoqing Hu, Huiyu Li, Guangwei Chen, and Zhehai Zhou "Dark-bright pair between bright pulses in a multimodal interference-based Q-switched mode-locking fiber laser", Proc. SPIE 12760, Advanced Lasers, High-Power Lasers, and Applications XIV, 1276016 (27 November 2023); https://doi.org/10.1117/12.2687228

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available