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

Fangfang Wei, Gerald Farrell, Qiang Wu, Yuliya Semenova

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Article number991608
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume9916
DOIs
Publication statusPublished - 30 May 2016

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