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NUMERICAL ANALYSIS OF FORMING UNIFORM FIBER BRAGG GRATINGS, USING PHASE MASK

In the work herein there was developed numerical analysis of forming uniform fiber Bragg gratings, using phase mask. There was developed method of recording Bragg grating, using uniform phase mask, which is characterized with a fact, that it consists of ultraviolet excimer laser, output laser light beam, directed to the system of mobile diaphragms with regulated gap between them and located behind the system of mobile diaphragms of uniform phase mask, after which there is a photosensitive multimode optical fiber with tilted Bragg grating. In the research there was applied diffraction theory to analyze intensity distribution in the fiber core during fabricating fiber Bragg grating (FBG), using uniform phase mask. There was calculated averaged distribution of diffraction field in the fiber core as a function of optic fiber position. Outcomes show, that in case of fabricating uniform FBG, averaged intensity field profile, as well, refraction index of optical fiber position behind phase mask is decreased for average intensity distribution in the fiber core along with increase of its diameter.