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A weakly coupled multi-core fibre-based Michelson interferometer composed of an in-fibre coupler

Farhan Mumtaz Yutang Dai Hu Wenbin Lashari G. Abbas Rashda Parveen Muhammad A. Ashraf 
Opto-Electronics Review | 2021 | 29 | 4 | 117-125 | DOI: 10.24425/opelre.2021.139436
Keywords Michelson interferometer in-fibre coupler seven core fibre temperature sensor
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Abstract

A compact temperature measuring device using a weakly coupled multi-core fibre in the Michelson interferometer structure is proposed and experimentally demonstrated. The device is manufactured by an easy and simple splicing approach which consists of a multi-core fibre segment and an in-fibre coupler. In-fibre coupler is made of a cascaded single-mode fibre and multi-core fibre balls. It enhances the interference phenomenon of light energy between the central core and the outer cores of a multi-core fibre. The sensor shows a high quality fringe visibility of about 14–18 dB in the wavelength spectrum. Multi-core structure presents multi-path interferences and exhibits a maximum temperature sensitivity of 70.6 pm/°C in the range of 20–90°C with an insensitive response to the refractive index in the range of 1.334 to 1.354. The device has the advantages of compact size, easy manufacturing, and it solves cross-sensitivity between temperature and refractive index making it an authentic real-time temperature monitoring solution.
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Authors and Affiliations

Farhan Mumtaz
1 2
ORCID: ORCID
Yutang Dai
3
ORCID: ORCID
Hu Wenbin
3
Lashari G. Abbas
3 1
Rashda Parveen
2
Muhammad A. Ashraf 
2
  1. School of Information and Communication Engineering, Wuhan University of Technology, Luoshi Road 122#, Wuhan 430070, China
  2. Communications Lab., Department of Electronics, Quaid-i-Azam University, Islamabad 45320, Pakistan
  3. National Engineering Laboratory for Fibre Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122#, Wuhan 430070, China

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