Enhanced RI sensor using a combination of a long period fiber grating and a small core singlemode fiber (SCSMF) structure

Qiang Wu; Youqiao Ma; Yuliya Semenova; Pengfei Wang; H. P. Chan; Gerald Farrell

doi:10.1117/12.971207

7 November 2012 Enhanced RI sensor using a combination of a long period fiber grating and a small core singlemode fiber (SCSMF) structure

Qiang Wu, Youqiao Ma, Yuliya Semenova, Pengfei Wang, H. P. Chan, Gerald Farrell

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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 842166 (2012) https://doi.org/10.1117/12.971207
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

An enhanced refractive index (RI) sensor with combination of long period fiber grating (LPG) and a small core singlemode fiber (SCSMF) structure is proposed and developed. Since the LPG and SCSMF transmission spectra experience a blue and red shift respectively as the surrounding RI (SRI) increases, the sensitivity is improved by measuring the separation between the resonant wavelengths of the LPG and SCSMF structures. Experimental results show that the sensor has a sensitivity of 1028 nm/SRI unit in the SRI range from 1.422 to 1.429, which is higher than individual sensitivities of either structure alone used in the experiment.

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Qiang Wu, Youqiao Ma, Yuliya Semenova, Pengfei Wang, H. P. Chan, and Gerald Farrell "Enhanced RI sensor using a combination of a long period fiber grating and a small core singlemode fiber (SCSMF) structure", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 842166 (7 November 2012); https://doi.org/10.1117/12.971207

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KEYWORDS

Structured optical fibers

Sensors

Refractive index

Liquids

Cladding

Fiber Bragg gratings

Single mode fibers

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