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

被引:4
|
作者
Fukano, Hideki [1 ]
Hashimoto, Takuya [1 ]
Taue, Shuji [1 ]
机构
[1] Okayama Univ, Okayama 7008530, Japan
关键词
REFRACTOMETER; INTERFEROMETER; LASER; CORE;
D O I
10.7567/JJAP.53.04EG05
中图分类号
O59 [应用物理学];
学科分类号
摘要
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 x 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 x 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. (C) 2014 The Japan Society of Applied Physics
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页数:4
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