▎ 摘　　要

NOVELTY - The structure has a switch fiber laser provided with a pump source that is connected with a multiplexer. A circulator is fixed with a bragg fiber. A standard single-mode optical fiber is formed with an offset core structure. A light coupler is provided with the standard single-mode optical fiber. A loop resonant cavity is connected with a multiplexer that is fixed with an output end and an input end. An end surface section is coated with graphene solution. The output end is connected with an optical fiber laser. USE - Graphene wave length based offset core switch fiber laser structure. ADVANTAGE - The structure improves mode competition effect, has simple structure, and is inexpensive. DESCRIPTION OF DRAWING(S) - The drawing shows a side view of a graphene wave length based offset core switch fiber laser structure.