Reflection-type optical fiber refractive-index sensor using a multimode interference structure with high sensitivity

Hideki Fukano, Takuya Hashimoto, Shuji Taue

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A high-sensitivity reflection-type refractive-index (RI) sensor using a multimode interference structure has been fabricated by forming a gold mirror at the end of a sensor fiber. The sensor part is composed of single-mode fibers (SMFs) attached to a multimode fiber (MMF) with an end-face mirror. This structure has the same function as an MMF sandwiched by SMFs, which is called a multimode interference (MMI) structure. The fabricated sensor shows a sensitivity as high as 6.8×10%6 (at 1 pm wavelength resolution), which is estimated from the relationship between the change in RI and the shift in wavelength in a wide RI range, and 1.0×10%5 (at 0.01 dB power resolution), which is estimated from the relationship between the change in RI and the variation of interference power at a fixed wavelength, despite the sensor having only half the length of a conventional two-port multimode interference RI sensor.

Original languageEnglish
Article number04EG05
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume53
Issue number4 SPEC. ISSUE
DOIs
Publication statusPublished - 2014

Fingerprint

Optical fibers
Refractive index
optical fibers
refractivity
interference
sensitivity
sensors
Sensors
fibers
Multimode fibers
Single mode fibers
Wavelength
Mirrors
wavelengths
mirrors
Gold
gold
Fibers
shift

ASJC Scopus subject areas

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

Cite this

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