Utilising a loop structure to allow a microfiber coupler with larger taper diameters to be used for sensing

Lewis, Elfed, Wei, Fangfang, Farrell, Gerald, Wu, Qiang and Semenova, Yuliya (2016) Utilising a loop structure to allow a microfiber coupler with larger taper diameters to be used for sensing. Proceedings of SPIE - The International Society for Optical Engineering, 9916. p. 991608. ISSN 0277-786X

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Official URL: http://dx.doi.org/10.1117/12.2236636

Abstract

This paper examines a technique that utilizes a Sagnac loop with a microfiber coupler (MFC) as a coupler which allows the MFC to operate effectively as a sensor but with larger than normal tapered fiber diameters. The proposed structure is found to be suitable for temperature and refractive index (RI) sensing. It is shown that a variation in the surrounding of the MFC RI results in a shift of the output spectrum, while a temperature variation leads to changes in the intensity of the interference dips. A decrease in the waist diameter of the MFC results in an increase in the sensitivity to temperature. For MFC structures based on a 5.6 μm and a 3 μm fiber waist diameter, the minimum transmission power level of a selected spectral dip decreases by 1.7 dB and 5.03 dB respectively, as the temperature changes from 18 °C to 44 °C. A change in the surrounding RI from 1.334 to 1.395 results in the spectral redshift of 8 nm using a 5.6 μm fiber waist diameter. By functionalizing the surface of the MFC with various materials, the structure could potentially be used for sensing of other parameters.

Item Type: Article
Uncontrolled Keywords: Microsoft Foundation Class Library; Refractive index; Sensors
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 15 Jul 2016 09:33
Last Modified: 03 Nov 2016 15:43
URI: http://nrl.northumbria.ac.uk/id/eprint/27283

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