All-fiber refractometer based on core mismatch structure

被引：12
作者：
Xu, F. [1 ,2 ,3 ]
Chen, D. [1 ,2 ,3 ]
Peng, B. [1 ,2 ,3 ]
Xu, J. [1 ,2 ,3 ]
Wu, G. [1 ,2 ,3 ]
机构：
[1] Zhejiang Normal Univ, Inst Informat Opt, Jinhua 321004, Peoples R China
[2] Zhejiang Normal Univ, Joint Res Lab Opt, Jinhua 321004, Peoples R China
[3] Zhejiang Univ, Jinhua 321004, Peoples R China
来源：
LASER PHYSICS | 2012年 / 22卷 / 10期
关键词：
OPTICAL-FIBER; HIGH-SENSITIVITY; SENSOR;
D O I：
10.1134/S1054660X12100271
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We demonstrate a novel all-fiber refractometer which is a multimode-single mode-multimode (MM-SM-MM) fiber structure formed by splicing a section of uncoated single mode fiber (SMF) with two short sections of multimode fibers (MMFs). Owing to the core mismatch at the splicing points of the SMF with two sections of MMFs, part of the guided light propagates in the cladding of the SMF, which makes the SMF sensitive to the external refractive index (RI). RI sensing is achieved by measuring the wavelength shift of the interference pattern of the cladding mode and the core mode of the SMF. A RI sensor with an average sensitivity of 412 nm/RUI (refractive index unit) for a RI range from 1.333 to 1.400 is presented.
引用
收藏
页码：1577 / 1580
页数：4
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