Femtosecond Laser Inscribed Small-Period Long-Period Fiber Gratings With Dual-Parameter Sensing

A small-period long-period grating (LPG) with a period of 40μm fabricated in a single-mode fiber by femtosecond laser direct writing has been demonstrated. A series of highorder Bragg resonant peaks of Bragg grating and attenuation bands of LPG can be observed simultaneously in the broadband spectru...

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Bibliographic Details
Published inIEEE sensors journal Vol. 18; no. 3; pp. 1100 - 1103
Main Authors Zheng, Zhong-Ming, Yu, Yong-Sen, Zhang, Xuan-Yu, Guo, Qi, Sun, Hong-Bo
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Axial strain
Broadband
Direct laser writing
femtosecond laser direct writing
Fiber lasers
Fiber optic sensors
Gratings (spectra)
Liquefied petroleum gas
Optical fiber sensors
Optical fibers
Refractivity
small-period long-period fiber gratings
Strain
Temperature measurement
Temperature sensors
Ultrafast optics
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Summary:A small-period long-period grating (LPG) with a period of 40μm fabricated in a single-mode fiber by femtosecond laser direct writing has been demonstrated. A series of highorder Bragg resonant peaks of Bragg grating and attenuation bands of LPG can be observed simultaneously in the broadband spectrum range that exhibited different responses to surrounding refractive index, temperature, and axial strain. Meanwhile, we provided a sensitivity matrix to correct the errors caused by temperature in measurements of refractive index and strain to achieve a dual-parameter fiber sensor at high temperature.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2017.2761794