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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

Power modulated temperature sensor with inscribed fibre Bragg gratings

M. Mądry K. Markowski K. Jędrzejewski E. Bereś-Pawlik
Opto-Electronics Review | 2016 | vol. 24 | No 4 | 183-190
Keywords fibre Bragg gratings temperature sensor system scanning FBGs reflected optical power intensity-modulated optical sensor
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Abstract

The Fibre Bragg Grating (FBG) based temperature optical sensor has been designed and demonstrated. FBGs have been modelled and fabricated so as to convert the Bragg wavelength shift into the intensity domain. The main experimental setup consists of a filtering FBG and two scanning FBGs, respectively, left and right scanning FBG, whereby scanning FBGs are symmetrically located on the slopes of the filtering FBG. Such an approach allows for the modulation of power for the propagating optical signal depending on the ambient temperature at the scanning FBG location. A positive or negative change of power is determined by the spectral response of the FBG. Experimental research of the scanning FBGs’ sensitivities emphasized that the key issue is the filtering FBG. A different level of sensitivity could be achieved due to the spectral characteristic of the filtering FBG. Omitting advanced and high-cost devices, the FBG-based temperature sensor is presented. The FBG-based sensor setup could yield resolution of 1°C for the range of temperature 0.5°C to 52.5°C. The experimental study has been performed as a base for an easy-placed sensor system to monitor external parameters in real environment.

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Authors and Affiliations

M. Mądry
K. Markowski
K. Jędrzejewski
E. Bereś-Pawlik

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