Fiber Mach-Zehnder interferometer based on microcavities for high-temperature sensing with high sensitivity

L. Jiang*, J. Yang, S. Wang, B. Li, M. Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

227 Citations (Scopus)

Abstract

A high-temperature sensor based on a Mach-Zehnder interferometer (MZI) in a conventional single-mode optical fiber is proposed and fabricated by concatenating two microcavities separated by a middle section. A femtosecond laser is used to fabricate a microhole on the center of a fiber end. Then a micro-air-cavity is formed by splicing the microholed fiber end with a normal fiber end. The interferometer is applied for high-temperature sensing, in the range of 500-1200 °C, with a sensitivity of 109pm/°C that, to the best of our knowledge, is highest in silica fiber temperature sensors. Also, the interferometer is insensitive to external refractive index (RI), which is desirable for temperature sensors.

Original languageEnglish
Pages (from-to)3753-3755
Number of pages3
JournalOptics Letters
Volume36
Issue number19
DOIs
Publication statusPublished - 1 Oct 2011

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