Open AccessHigh-accuracy quasi-distributed optical fiber Bragg gratingseismic demodulation system
Author(s) -
Xueguang Qiao,
Feng Dai,
Zhang Jia,
Haiwei Fu,
Ying Xu-Dong,
Rui Zhou,
Junlei Song
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.074221
Subject(s) - demodulation , sensitivity (control systems) , optics , filter (signal processing) , wavelength , computer science , fiber bragg grating , optical fiber , materials science , physics , telecommunications , electronic engineering , engineering , computer vision , channel (broadcasting)
A new earthquake detection demodulation system for monitoring several points and several parameters at the same time is proposed by using the linear sideband of super-fluorescent fiber source as an edge filter. The sensitivity of whole demodulation system is determined by the detecting sensitivity of source light. Through the optimization of light, the slope of light linear part is improved greatly. According to the rising and the falling of light, the system is divided into two parts each with four channels. Through the stimulation experiments of all the channels, the static wavelength sensitivities of the two parts are 887.5 mV/nm and -971.7 mV/nm, and their stain resolutions reseach 0.95με and 0.86με respectively. This demodulation system has high sensitivity, good stability, quick demodulation speed, etc. It is the most important is that it can realize real-time detection for several points and several parameters at the same time.