Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 28, Issue 1, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2021.3101405
Keywords
Solitons; Optical fiber dispersion; Laser mode locking; Optical fiber filters; Fiber lasers; Optical fiber couplers; Band-pass filters; Fiber lasers; optical solitons; laser mode locking; fiber nonlinear optics
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51527901, 61975090]
- Fundamental Research Funds for the Central Universities [BUPT2021RC08]
- State Key Laboratory of IPOC (BUPT), P. R. China [IPOC2020ZT02]
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This paper numerically investigates the soliton dynamics in mode-locked fiber lasers based on sinusoidal spectral filtering (SSF). It is found that SSF can facilitate the formation of dual-wavelength mode locking and generate dual-comb solitons with slightly different group velocities. Moreover, pulse shaping based on SSF and gain filtering leads to a non-monotonic relationship between the group velocity difference of the solitons and the cavity gain. Additionally, dual-comb soliton mode locking exhibits a threshold feature and multi-pulse instability.
Sinusoidal spectral filtering (SSF) plays an essential role in dual- and multi-wavelength operations in mode-locked fiber lasers. However, the impact of SSF on the underlying soliton dynamics has not been systematically revealed so far. Herein, we investigate numerically the SSF-based soliton dynamics in mode-locked fiber lasers. SSF could facilitate the formation of dual-wavelength mode locking, and the generation of dual-comb solitons with slightly different group velocities. Pulse shaping based on SSF and gain filtering leads to the non-monotonic relationship between both solitons' group velocity difference and the cavity gain. In addition, dual-comb soliton mode locking exhibits threshold feature and multi-pulse instability to soliton annihilation and diverse soliton coexistences. Our investigations could shade new light on the SSF-based soliton dynamics and might bring new insights into the laser design and applications.
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