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We report a wavelength-tunable Q-switched mode-locked fiber laser based on acompact optical tuning device, which is fabricated by coating single-layergraphene on the surface of micro-fiber Bragg grating (MFBG). Based onthermal-optical effect through evanescent interaction between graphene andMFBG, the center wavelength of MFBG can be accurately controlled by adjustingpower of an external laser. By inserting the fabricated device into a compactfiber laser cavity mode-locked by single-wall carbon nanotubes, stableQ-switched mode-locked pulse is generated. Experimental results show that thewavelength can be precisely optical-tuned from 1550.1 nm to 1551.9 nm with alinear sensitivity of 6.3 pm/mW. Such an optical-controlled wavelength-tunableQ-switched mode-locked fiber laser may find potential applications inall-optical computing, all-optical logic gating and generation of microwavesource.

Optical-controlled wavelength-tunable Q-switched mode-locked fiber laser based on graphene-deposited micro-FBG