All-optical phase modulator based on gas photothermal effect in micro-nanofiber

The utility model discloses an all-optical phase modulator based on a gas photothermal effect in a micro-nano optical fiber, and the modulator comprises a pump light source which is used for emitting control light; the first light inlet end of the wavelength division multiplexer is arranged at the light outlet end of the pump light source and used for inputting control light, and the second light inlet end of the wavelength division multiplexer is used for inputting signal light; the optical fiber gas chamber is connected to the common end of the wavelength division multiplexer, the optical fiber gas chamber comprises a sealed inner cavity and a micro-nano optical fiber located in the sealed inner cavity, the micro-nano optical fiber is filled with absorptive gas, and the temperature and the refractive index of the absorptive gas are changed by controlling light so as to cause phase change of the signal light; and the fiber bragg grating is arranged at the light outlet end of the fiber gas chamber and is used