Experimental analysis of optical fiber multimode interference structure and its application to refractive index measurement

Shuji Taue, Yoshiki Matsumoto, Hideki Fukano, Kenji Tsuruta

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We investigated a fiber-based multimode interference phenomenon in the wavelength domain by using a white light source and an optical spectrum analyzer. This phenomenon was produced by a larger-core optical fiber joined at both ends with smaller-core optical fibers. We examined the variation of interference wavelength with changes in the length of the larger-core fiber. The interference wavelengths were blueshifted and the interference signals were sharpened with an increase in the length of the larger-core fiber. The calculated results agreed well with the measured results. Next, we investigated how the input and output fibers with a small core influence the interference signal characteristics. By comparing the amplitude differences of the interference signal we find the conditions of input and output (I/O) fibers for higher sensitivity. In addition, an interference-signal shift was observed by changing the medium surrounding an multimode interference (MMI) structure. The amount of shift increased at a longer wavelength. This leads to the sensitive detection of the refractive index. Finally, a demonstration of the optical fiber refractometer with a multimode interference structure was given by refractive-index measurements of ethanol/water solutions.

Original languageEnglish
Article number04DG14
JournalJapanese Journal of Applied Physics
Volume51
Issue number4 PART 2
DOIs
Publication statusPublished - Apr 2012

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Optical fibers
Signal interference
Refractive index
optical fibers
refractivity
interference
Fibers
Wavelength
fibers
Refractometers
Wave interference
Spectrum analyzers
wavelengths
Light sources
Ethanol
Demonstrations
refractometers
output
shift
optical spectrum

ASJC Scopus subject areas

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

Cite this

Experimental analysis of optical fiber multimode interference structure and its application to refractive index measurement. / Taue, Shuji; Matsumoto, Yoshiki; Fukano, Hideki; Tsuruta, Kenji.

In: Japanese Journal of Applied Physics, Vol. 51, No. 4 PART 2, 04DG14, 04.2012.

Research output: Contribution to journalArticle

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