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Gigahertz Harmonic Mode‐Locked Fiber Laser Based on Tunable SMS Ultrafast Optical Switch
Author(s) -
Wang Tiebin,
Jin Liang,
Zhang Hongwei,
Pan Wei,
Zhang He,
Xu Yingtian,
Shi Linlin,
Li Yan,
Zou Yonggang,
Ma Xiaohui
Publication year - 2020
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.202000018
Subject(s) - ultrashort pulse , multi mode optical fiber , materials science , fiber laser , optics , polarization controller , mode locking , laser , optoelectronics , polarization maintaining optical fiber , single mode optical fiber , optical fiber , wavelength , fiber optic sensor , physics
A novel passively gigahertz harmonic mode‐locked all‐fiber laser based on hybrid fiber structure (single‐mode fiber–graded‐index multimode fiber–single‐mode fiber (SMS)) is proposed SMS, which coils on the paddles of polarization controller (PC), is demonstrated to modulate the temporal intensity for mode‐locking. The nonlinear absorption properties of the optical switch are controllable by adjusting the paddles of PC; such an ultrafast optical switch enables the wavelength switchable harmonic mode‐locking operation. Ultrafast pulses with 1.9 ps at 1558.41 nm and 0.95 ps at 1563.08 nm are generated. The maximum repetition rate of the laser up to 1.127 GHz harmonic of fundamental repetition mode‐locking at 1563.08 nm, corresponding to 880 order, and the output power is 4.2 mW. Considering its superiority in terms of low cost, easy integration, and high reliability, the findings validate that SMS can be used in harmonic mode‐locking.