Title :
FBG Sensor Demodulated by Multimode Interference of Multimode Fiber
Author :
Zhang, Jianzhong ; Guo, Minglei ; Gao, Qilin ; Sun, Weimin ; Yuan, Libo ; Wang, Kaijun ; Jing, Wencai ; Peng, G.D.
Author_Institution :
Coll. of Sci., Harbin Eng. Univ., Harbin, China
Abstract :
We demonstrate an novel intensity based demodulation scheme for FBG sensors. The wavelength shifts of FBG sensors are transferred to the light power changes by a demodulator based on the multimode interference of multimode fiber. A demonstration system is built up, based on a broadband source ASE, a photo detector, and a ~5 cm long step-index multimode fiber with core/cladding radius 52.5/62.5 mum is used. The static and dynamic tests of the sensing system are given to prove the feasibility of the intensity based demodulator.
Keywords :
Bragg gratings; demodulators; fibre optic sensors; light interference; optical fibre cladding; optical fibre testing; photodetectors; superradiance; FBG sensor; broadband source ASE; intensity based demodulator; multimode fiber cladding; multimode interference; photo detector; radius 52.5 mum; radius 62.5 mum; step-index multimode fiber; Bragg gratings; Demodulation; Fiber gratings; Interference; Optical fiber couplers; Optical fiber polarization; Optical fiber sensors; Optical fiber testing; Temperature sensors; Vibration measurement;
Conference_Titel :
Photonics and Optoelectronics, 2009. SOPO 2009. Symposium on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-4412-0
DOI :
10.1109/SOPO.2009.5230234
