Compact assembly-free vector bend sensor based on all-in-fiber-core Mach-Zehnder interferometer

被引：50
作者：
Chen, Pengcheng [1 ,2 ]
Shu, Xuewen [1 ,2 ]
Sugden, Kate [3 ]
机构：
[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Optoelect Sci & Engn, Wuhan 430074, Peoples R China
[3] Aston Univ, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England
来源：
OPTICS LETTERS | 2018年 / 43卷 / 03期
基金：
中国国家自然科学基金;
关键词：
PHOTONIC CRYSTAL FIBER; MULTICORE OPTICAL-FIBER; PERIOD GRATINGS WRITTEN; LATERAL-OFFSET; REFRACTIVE-INDEX; BRAGG GRATINGS;
D O I：
10.1364/OL.43.000531
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A novel low-cost, compact, assembly-free and sensitive optical fiber curvature sensor is presented. This device consists of an off-axis positive refractive index modified zone (PRIMZ), induced by a direct femtosecond laser, written in a single-mode fiber (SMF) core. The PRIMZ transforms the original SMF section into a few-mode fiber (FMF). As a result, the whole fiber forms an assembly-free "SMF-FMFSMF" sandwich Mach -Zehnder interferometer. When the device is bent, a direction-dependent spectral shift of the interference pattern is produced. The sensitivity of the sensor is up to 2.53 and 2.24 nm/m(-1) for the 0 degrees and 180 degrees orientations in a wide bend range (from 0 to 4 m(-1)). In addition, the device is immune to the surrounding refractive index and has a low-temperature crosstalk, which makes it very attractive for practical structural monitoring applications. (C) 2018 Optical Society of America
引用
收藏
页码：531 / 534
页数：4
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