Title :
Strong fiber Bragg grating fabrication by hybrid 157- and 248-nm laser exposure
Author :
Chen, K.P. ; Herman, P.R. ; Tam, R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
Abstract :
A permanent 248-nm photosensitivity response was locked into hydrogen-loaded standard telecommunication fiber by uniform 157-nm F2-laser pre-exposure. Strong (>30 dB) fiber Bragg gratings were efficiently generated after hydrogen out-diffusion, improving the thermal stability. The 157-mn radiation produced weakly absorbing Si-OH and Ge-OH absorption bands at 1.39-μm.
Keywords :
Bragg gratings; optical fibre fabrication; optical fibre losses; refractive index; thermal stability; ultraviolet radiation effects; 1.39 micron; 157 nm; 248 nm; annealing; cladding-mode losses; fiber pretreatment; hybrid laser exposure; hydrogen out-diffusion; hydrogen-loaded telecommunication fiber; permanent photosensitivity response; processing window; refractive index profile; strong FBG fabrication; thermal stability; transmission spectrum; weakly absorbing absorption bands; wide processing latitude; Absorption; Annealing; Bragg gratings; Fiber gratings; Fiber lasers; Hydrogen; Optical device fabrication; Planar waveguides; Telecommunication standards; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
