Hollow Core Fiber Based Interferometer for High-Temperature (1000 °c) Measurement

Dejun Liu, Qiang Wu, Chao Mei, Jinhui Yuan, Xiangjun Xin, Arun Kumar Mallik, Fangfang Wei, Wei Han, Rahul Kumar, Chongxiu Yu, Shengpeng Wan, Xingdao He, Bo Liu, Gang Ding Peng, Yuliya Semenova, Gerald Farrell

Research output: Contribution to journalArticlepeer-review

Abstract

A simple, cost effective high-temperature sensor (up to 1000 °C) based on a hollow core fiber (HCF) structure is reported. It is configured by fusion splicing a short section of HCF with a length of few millimeters between two standard single mode fibers (SMF-28). Due to multiple beam interference introduced by the cladding of the HCF, periodic transmission dips with high spectral extinction ratio and high-quality (Q) factor are excited. However, theoretical analysis shows that minor variations of the HCF cladding diameter may result in a significant decrease in the Q factor. Experimental results demonstrate that the position of periodic transmission dips are independent of the HCF length, but spectral Q factors and transmission power varies with different HCF lengths. A maximum Q factor of 3.3 × 104 has been demonstrated with large free spectral range of 23 nm and extinction ratio of 26 dB. Furthermore, the structure is proved to be an excellent high-temperature sensor with advantages of high sensitivity (up to 33.4 pm/ °C), wide working temperature range (from room temperature to 1000 °C), high resolution, good stability, repeatability, relatively low strain sensitivity (0.46 pm/μϵ), low cost, and a simple and flexible fabrication process that offers a great potential for practical applications. A thorough theoretic analysis of the HCF-based fiber structure has been proposed. The experimental results are demonstrated to be well matched with our simulation results.

Original languageEnglish
Article number8219386
Pages (from-to)1583-1590
Number of pages8
JournalJournal of Lightwave Technology
Volume36
Issue number9
DOIs
Publication statusPublished - 1 May 2018

Keywords

  • Optical fiber applications
  • optical fiber sensors
  • optical interferometry
  • optical spectroscopy
  • temperature sensors

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