Title :
Modeling and performance analysis of a fiber Bragg grating interrogation system using an acousto-optic tunable filter
Author :
Xu, Ming Gang ; Geiger, Harald ; Dakin, John P.
Author_Institution :
Optoelectron. Res. Centre, Southampton Univ., UK
fDate :
3/1/1996 12:00:00 AM
Abstract :
The performance of a fiber grating interrogation system using an acousto-optic tunable filter (AOTF) is analyzed. An equivalent linear circuit is presented to describe the system, which tracks the wavelength of a fiber Bragg grating (FBG) sensor in a FBG sensor array. From the model, the tracking resolution of a shot-noise-limited system has been determined for both transmissive and reflective interrogation of FBGs. An optimum ratio between the bandwidths of the FBG and the AOTF has been derived. Experimental results of a tracking system are presented to validate the theoretical predictions. The theory should also be suitable for interrogation systems using other forms of tunable bandpass filters for tracking the FBG wavelength
Keywords :
acousto-optical filters; diffraction gratings; equivalent circuits; fibre optic sensors; modelling; optical noise; shot noise; FBG sensor array; acousto-optic tunable filter; equivalent linear circuit; fiber Bragg grating interrogation system; fiber Bragg grating sensor; optimum ratio; performance analysis; reflective interrogation; shot-noise-limited system; tracking resolution; tracking system; transmissive interrogation; tunable bandpass filters; Bragg gratings; Fiber gratings; Filters; Linear circuits; Optical fiber sensors; Performance analysis; Sensor arrays; Sensor phenomena and characterization; Sensor systems; Tunable circuits and devices;
Journal_Title :
Lightwave Technology, Journal of
