A simple fiber Bragg grating-based sensor network architecture with self-protecting and monitoring functions.
A novel fiber Bragg grating (FBG)-based passive sensor architecture, which can be used to protect the fiber cut and monitor the multiple sensors simultaneously, is proposed and experimentally demonstrated. Here, we employ a wavelength-tunable erbium-doped fiber (EDF) laser scheme with 25 km cavity length acting as the detecting light source in central office (CO). Each FBG sensor, serving as a feedback element, is used in proposed sensor architecture. By tuning the tunable bandpass filter (TBF) placing inside cavity to match the corresponding Bragg wavelength of FBG over the amplification bandwidth, we can retrieve the related wavelength lasing for the FBG sensing and monitoring simultaneously. Moreover, the survivability and capacity of the passive FBG sensor architecture can be also enhanced.
Information and Communications Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan. depew@itri.org.tw
Chien-Hung
CH
Yeh
Chi-Wai
CW
Chow
Ping-Chun
PC
Wu
Fan-Gang
FG
Tseng
D004871:Erbium / Q000737:chemistry; D005336:Fiber Optic Technology / Q000295:instrumentation*; D055100:Optical Fibers; D055620:Optical Phenomena; D013057:Spectrum Analysis
D004871:Erbium