NDLI: Cladding-Mode Backward-Recoupling-Based Displacement Sensor Incorporating Fiber Up Taper and Bragg Grating

Content Provider	IEEE Xplore Digital Library
Author	Tao Qi Shilin Xiao Jie Shi Lilin Yi Zhao Zhou Meihua Bi Weisheng Hu
Copyright Year	2009
Abstract	A temperature-insensitive fiber-optic displacement sensing scheme by cascading the fiber up taper and Bragg grating is experimentally demonstrated. The strength-robust up taper, which is fabricated by excessively splicing the Bragg grating to the interrogation fiber, functions as the bridge between the core mode and the cladding modes. This cascading structure realizes the cladding-mode backward recoupling, and displacement information can be directly read out by measuring the power of the highly bending sensitive recoupled cladding modes. Two sensing configurations that respectively utilize the normal fiber Bragg grating (FBG) and the uniform chirped FBG (CFBG) for the cladding-mode backward recoupling have been studied contrastively, in which the tunability of the up taper is fully validated to support a better dynamic range of the measurement. Aiming to improve the low reflection power and enhance the sensing sensitivity, the CFBG is used, and the reflection power is increased by more than 200 times and reaches 176 μW, which lowers the precision requirement for the optical power meter and potentially reduces the cost of the sensing system.
Starting Page	7100608
Ending Page	7100608
Page Count	1
File Size	927372
File Format	PDF
ISSN	19430655
Volume Number	5
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fiber gratings Couplings Optical fiber sensors Temperature sensors Gratings temperature-independent Fiber up taper fiber Bragg grating displacement sensor
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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