Jpn. J. Appl. Phys. 51 (2012) 04DG14 (4 pages) |Previous Article| |Next Article| |Table of Contents|
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Experimental Analysis of Optical Fiber Multimode Interference Structure and its Application to Refractive Index Measurement
Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
(Received September 26, 2011; revised January 26, 2012; accepted January 27, 2012; published online April 20, 2012)
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.
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