▎ 摘　　要

NOVELTY - The system (100) has a metal reflector (5) to rotate certain angle along direction perpendicular to laser incidence. A WDM optical fiber coupler (2) pumped light emitted from source end into erbium-doped polarization optical fiber (3). A circulator (4) outputs signal light from a first port to a second port and the approximately collimated laser output from the second port passes through connecting short rod type optical fiber. The reflector is reflected again into the second port, and then output of the laser is outputted from the third port into an output coupler (7). USE - Mode-locked fiber laser system for switching wavelength through graphene mirror. ADVANTAGE - The provision of polarization maintaining optical fiber as a ring resonator of a mode-locked fiber laser achieves high extinction ratio of the linearly polarized laser output. The provision of multilayer graphene as a saturable absorber locking device reduces the production cost and process difficulty and thereby allows to realize industrialization. DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of the mode-locked fiber laser system for switching wavelength through graphene mirror. WDM optical fiber coupler (2) Erbium-doped polarization optical fiber (3) Circulator (4) Metal reflector (5) Output coupler (7) Mode-locked fiber laser system (100)