Refractive Index and Temperature Sensor Based on Double-Pass M–Z Interferometer With an FBG

Author

Yanfang Lu ; Changyu Shen ; Chuan Zhong ; Debao Chen ; Xinyong Dong ; Jinhui Cai

Author_Institution

Coll. of Optoelectron. of China, Jiliang Univ., Hangzhou, China

Volume

26

Issue

11

fYear

2014

fDate

1-Jun-14

Firstpage

1124

Lastpage

1127

Abstract

In order to measure the refractive index (RI) and temperature simultaneously, a double-pass in-line Mach-Zehnder interferometer (MZI) is proposed. The in-line MZI was formed by inscribing a pair of long period gratings in a single mode fiber. A fiber Bragg grating (FBG) was inscribed next to the output port of the MZI. Part of the MZI interference light was reflected by the FBG and the fiber end, and then a double MZI interference pattern was formed. A sensitivity of -21.07 nm/RIU is obtained in the RI range of 1.33-1.43. In addition, the FBG is also used as a temperature measuring and compensating section. This kind of RI and temperature simultaneous measurement optical fiber sensor could be used in chemical or biochemical sensing fields.

Keywords

Bragg gratings; Mach-Zehnder interferometers; fibre optic sensors; light interference; refractive index measurement; temperature sensors; double-pass in-line Mach-Zehnder interferometer; fiber Bragg grating; long period gratings; refractive index sensor; single mode fiber; temperature sensor; Fiber gratings; Interference; Optical fiber sensors; Optical fibers; Temperature measurement; Temperature sensors; Refractive index sensor; double-pass in-line Mach??Zehnder interferometer; fiber Bragg grating; long period grating;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2315804

Filename

6783790