Coating-free reflection technique for fiber-optic sensors based on multimode interference: A temperature sensing study

Shuji Taue, Tsuyoshi Takahashi, Hideki Fukano

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A novel reflection technique for use in fiber-optic sensors is investigated and applied to a multimode interference structure. The reflectivity at a fiber end face is increased with two operations. Firstly, the light intensity is increased toward the periphery of the end-face by adjusting the fiber length, which is determined theoretically. Secondly, the fiber end-face is deformed into an ellipsoid by heating it with a gas torch. The deformed shape is characterized from microscopic images. The reflected light intensity is increased by more than 10 dB as a result of controlling the fiber length and deforming its end-face. Temperature sensing was performed using the reflection-type multimode interference structure immersed in temperaturecontrolled silicone oil. The resulting sensitivity was 0.028 C for a 29.60mm sensing region, achieved without using any reflection coating.

Original languageEnglish
Article number08RE03
JournalJapanese Journal of Applied Physics
Volume55
Issue number8
DOIs
Publication statusPublished - Aug 1 2016

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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