THE METHOD FOR FABRICATING THE CHIRPED FIBER BRAGG GRATING

摘要

The invention of (chirped) fiber Bragg grating cheopping relates to a manufacturing method (fiber Bragg grating), the general this, germanium is mainly used for fiber Bragg grating fabrication added at a higher concentration in the fiber core, a photosensitive optical fiber ( by applying a heat of high temperature to a certain region of the photosensitive fiber) then change the effective refractive index of the mode is experienced to be guided in a direction by the diffusion of impurities (dopant) in the cladding to light proceeds within the optical fiber core is present in the fiber core, cycle even if making the short-period fiber Bragg grating with a uniform phase mask to a method of making a fiber Bragg grating cheopping, such as if the cycle is changed to the optical fiber longitudinal direction (or the direction of movement of the light). In the case of the present invention it has a precise optical system or cycle is advantageous in that without the need for expensive cheopping the phase mask, simple and can be easily produced a cheopping fiber Bragg grating which changes according to the length.