Strain-Insensitive Optical Fiber Mach-Zehnder Interferometric Temperature Sensor

Abstract

A fiber Mach-Zehnder interferometer (MZI) constructed by concatenating a micro cavity in the fiber core and a taper is proposed and applied for temperature sensing. Femtosecond laser micro-machining technique and fusion splicing technique are utilized to fabricate the micro cavity in a single mode optical fiber core. The fiber taper is fabricated by electric arc-discharge with a conventional fusion splicer. A sensitivity of 68 pm/°C is obtained at the temperature range of 200-400°C. The interferometer is also characterized by different strain.It exhibits very low strain sensitivity because only low order cladding modes are excited by the micro cavity, which is a desirable merit for temperature sensor to eliminate cross sensitivity to strain.

Meeting Name

2011 International Conference on Optical Instruments and Technology

Department(s)

Mechanical and Aerospace Engineering

Keywords and Phrases

Optical Fibers; Temperature Sensors; Fusion Splicing; Interferometers; Mach-Zehnder Interferometer; Micromachining; Cladding; Femtosecond Phenomena

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2011 SPIE, All rights reserved.

Publication Date

01 Jan 2011

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