Birefringent Bragg Grating in C-Shaped Optical Fiber as a Temperature-Insensitive Refractometer

Birefringent Bragg Grating in C-Shaped Optical Fiber as a Temperature-Insensitive Refractometer

We demonstrate a simple-to-fabricate refractometer based on the inscription of fiber Bragg gratings in a special C-shaped optical fiber. The C-shaped fiber was drawn into shape using a quarter cladding removed preform of a commercial standard single-mode fiber by simple machining. The sensor did not...

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Bibliographic Details
Main Authors: Rex Xiao Tan, Daryl Ho, Chun Ho Tse, Yung Chuen Tan, Seong Woo Yoo, Swee Chuan Tjin, Morten Ibsen
Format: Article
Language:English
Published: MDPI AG 2018-09-01
Series:Sensors
Subjects:
fiber sensors
fiber Bragg gratings
specialty fibers
refractometers
Online Access:http://www.mdpi.com/1424-8220/18/10/3285
Description
Summary:We demonstrate a simple-to-fabricate refractometer based on the inscription of fiber Bragg gratings in a special C-shaped optical fiber. The C-shaped fiber was drawn into shape using a quarter cladding removed preform of a commercial standard single-mode fiber by simple machining. The sensor did not suffer from cross-sensitivity of the refractive index with ambient temperature fluctuations, commonly occurring with many optical fiber refractometers. A refractive index sensitivity of 1300 pm per refractive index unit (RIU) was achieved without employing any additional sensitization techniques such as tapering or etching.
ISSN:1424-8220

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