Experimental Analysis of Optical Fiber Multimode Interference Structure and its Application to Refractive Index Measurement
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説明
<jats:p> 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 blue-shifted 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. </jats:p>
収録刊行物
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- Japanese Journal of Applied Physics
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Japanese Journal of Applied Physics 51 (4S), 04DG14-, 2012-04-01
IOP Publishing
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詳細情報 詳細情報について
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- CRID
- 1360003446856890880
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- NII論文ID
- 210000140540
- 210000072162
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- ISSN
- 13474065
- 00214922
- http://id.crossref.org/issn/13474065
- https://id.crossref.org/issn/13474065
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