Graphene-assisted micro optical fiber ring-shaped cavity all-optical switch

The invention discloses a graphene-assisted micro optical fiber ring-shaped cavity all-optical switch which comprises a graphene thin film and a micro optical fiber ring-shaped cavity device and is characterized in that the graphene thin film coats a cavity part of the micro optical fiber ring-shaped cavity device. According to the graphene-assisted micro optical fiber ring-shaped cavity all-optical switch disclosed by the invention, a photothermal effect of the graphene thin film is excited by driving light to generate ohmic heat, and a micro optical fiber ring-shaped cavity is heated by heat conduction; a refractive index of the micro optical fiber ring-shaped cavity is changed due to a thermo-optic effect so as to cause movement of a resonant wavelength of the micro optical fiber ring-shaped cavity; an output power of signal light entering the micro optical fiber ring-shaped cavity is changed along with change of the resonant wavelength; by modulating on or off of the driving light, the maximum or minimum output optical power of the signal light can be controlled, i.e. on or off of the signal light can be achieved. The graphene-assisted micro optical fiber ring-shaped cavity all-optical switch is benefited from a high-efficiency photothermal effect of graphene, the miniaturized micro optical fiber ring-shaped cavity and an all-optical driving technology, has the advantages of compact structure, low cost, high efficiency and the like, and has important application prospect in the fields of optical fiber communication, optical filtering and the like.