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 language | English |
|---|---|
| Article number | 04DG14 |
| Journal | Japanese Journal of Applied Physics |
| Volume | 51 |
| Issue number | 4 PART 2 |
| DOIs | |
| Publication status | Published - Apr 2012 |
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ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)
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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 journal › Article
}
TY - JOUR
T1 - Experimental analysis of optical fiber multimode interference structure and its application to refractive index measurement
AU - Taue, Shuji
AU - Matsumoto, Yoshiki
AU - Fukano, Hideki
AU - Tsuruta, Kenji
PY - 2012/4
Y1 - 2012/4
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84860376439&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84860376439&partnerID=8YFLogxK
U2 - 10.1143/JJAP.51.04DG14
DO - 10.1143/JJAP.51.04DG14
M3 - Article
AN - SCOPUS:84860376439
VL - 51
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 4 PART 2
M1 - 04DG14
ER -