SINGLE EXCIMER LASER PULSE WRITING OF NARROW-BAND FIBER BRAGG REFLECTORS BY PHASE MASK METHOD
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The article presents the results of fiber Bragg gratings writing in birefringent optical fibers with enhanced photorefractive feature by a single 20 ns pulse of KrF excimer laser (248 nm wavelength). Fiber Bragg gratings in birefringent optical fiber with elliptical stress cladding with reflection more than 10% and spectral width at half maximum ~ 0.1 nm were obtained. Beat length and the effective refractive index for each of the selected axes of a birefringent fiber were calculated based on experimentally obtained data.