NDLI: Phase-Shifted Terahertz Fiber Bragg Grating for Strain Sensing With Large Dynamic Range

Content Provider	IEEE Xplore Digital Library
Author	Hefferman, G. Zhen Chen Lei Yuan Tao Wei
Copyright Year	1989
Abstract	Recent advances in optical fiber sensing techniques have demonstrated the utility of terahertz (THz) gratings as a modality for strain and temperature sensing. However, these techniques remain reliant on the use of higher order resonant peaks, enhancing their sensitivity at the cost of limited dynamic range. The use of a lower order resonant peak for sensing can lead to a larger dynamic range at the cost of accuracy. This letter reports a π-phase-shifted THz fiber Bragg grating, fabricated using a femtosecond laser, capable of detecting changes in strain over a substantially larger dynamic range than previously reported methods with improved accuracy. A second THz grating without a π-phase-shifted structure, but otherwise identically constructed, was interrogated in series on the same optical fiber. The two devices were simultaneously experimentally investigated using a strain test (~1 mε in total), and the results presented in this letter. In addition, the theoretical models of the devices were created, which closely matched experimentally observed device physics.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	1649
Ending Page	1652
Page Count	4
File Size	555423
File Format	PDF
ISSN	10411135
Volume Number	27
Issue Number	15
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fiber gratings Optical fiber sensors Strain Optical fibers Optical interferometry optical fiber sensor terahertz Bragg grating interferometry Terahertz Bragg grating
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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