Title :
Spatial characterization of strong fiber Bragg gratings using thermal chirp and optical-frequency-domain reflectometry
Author :
Waagaard, Ole Henrik
Author_Institution :
Dept. of Phys. Electron., Norwegian Univ. of Sci. & Technol., Norway
Abstract :
A method that can spatially characterize gratings with grating strength |κ|L up to 10 is presented. The grating is thermally chirped, which increases the transmissivity through the grating. The complex reflectivity spectrum is measured using optical-frequency-domain reflectometry, and the spatial profile is reconstructed using the time-domain layer-peeling algorithm. The spatial profiles of a uniform grating with grating strength |κ|L = 8.25 (-66-dB minimum transmissivity) and a distributed-feedback fiber laser grating with grating strength |κ|L = 7.5 are accurately reconstructed from the measured complex reflection spectrum.
Keywords :
Bragg gratings; distributed feedback lasers; fibre lasers; optical fibre testing; optical time-domain reflectometry; complex reflectivity; distributed-feedback fiber laser grating; fiber Bragg gratings; grating strength; optical-frequency-domain reflectometry; spatial profile; thermal chirp; time-domain layer-peeling algorithm; transmissivity; Bragg gratings; Chirp; Fiber gratings; Fiber lasers; Optical fiber communication; Optical interferometry; Optical scattering; Optical sensors; Reflectivity; Reflectometry; Distributed-feedback fiber lasers (DFB-FLs); fiber Bragg gratings (FBGs); grating reconstruction; layer peeling; optical-frequency-domain reflectometry; spatial characterization; thermal chirp;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2004.838868
