Research on SFTS structure based optical fiber sensor

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2019,（1）
• 页码范围: 39-42
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11801-019-8079-4

摘要

A single-mode-few-mode-thin-core-single-mode (SFTS) structure based optical fiber sensor is fabricated and experimentally studied.The sensing principle relies on the inter-modal interference.Since the core diameter of few-mode fiber (FMF) is larger than that of single-mode fiber (SMF),the FMF helps to allow more light to enter the cladding of thin-core fiber (TCF),which helps TCF to excite cladding modes.The interference between core and cladding modes in TCF occurs at the joint of lead-out SMF and TCF.Experimental results demonstrate a refractive index (RI) sensitivity of-103.34 nm/RIU and a temperature sensitivity of 0.05 nm/℃.The proposed sensor not only can measure temperature,but also can measure RI.In addition,the proposed sensor is simple for without complicated fabrication process.