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

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS | 2014年 / 53卷 / 04期

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

引用

页数：4

共 26 条

[1] Single-mode fiber polished into the core as a sensor element [J].