Performance analysis of polymer optical fibre based Fabry-Perot sensor formed by two uniform Bragg gratings

Pospori, A. and Webb, D.J. (2016). Performance analysis of polymer optical fibre based Fabry-Perot sensor formed by two uniform Bragg gratings. IN: Micro-Structured and Specialty Optical Fibres. Kalli, Kyriacos and Mendez, Alexis (eds) SPIE Proceedings . BEL: SPIE.

Abstract

The stress sensitivity of polymer optical fibre (POF) based Fabry-Perot sensors formed by two uniform Bragg gratings with finite dimensions is investigated. POF has received high interest in recent years due to its different material properties compared to its silica counterpart. Biocompatibility, a higher failure strain and the highly elastic nature of POF are some of the main advantages. The much lower Young’s modulus of polymer materials compared to silica offers enhanced stress sensitivity to POF based sensors which renders them great candidates for acoustic wave receivers and any kind of force detection. The main drawback in POF technology is perhaps the high fibre loss. In a lossless fibre the sensitivity of an interferometer is proportional to its cavity length. However, the presence of the attenuation along the optical path can significantly reduce the finesse of the Fabry-Perot interferometer and it can negatively affect its sensitivity at some point. The reflectivity of the two gratings used to form the interferometer can be also reduced as the fibre loss increases. In this work, a numerical model is developed to study the performance of POF based Fabry-Perot sensors formed by two uniform Bragg gratings with finite dimensions. Various optical and physical properties are considered such as grating physical length, grating effective length which indicates the point where the light is effectively reflected, refractive index modulation of the grating, cavity length of the interferometer, attenuation and operating wavelength. Using this model, we are able to identify the regimes in which the PMMA based sensor offer enhanced stress sensitivity compared to silica based one.

Publication DOI: https://doi.org/10.1117/12.2227481
Divisions: Engineering & Applied Sciences > Aston Institute of Photonics Technology
Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Additional Information: -Andreas Pospori, David J. Webb, " Performance analysis of polymer optical fibre based Fabry-Perot sensor formed by two uniform Bragg gratings ", Proc. SPIE 9886, Micro-Structured and Specialty Optical Fibres IV, 98861F (April 27, 2016). Copyright 2016 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. DOI: http://dx.doi.org/10.1117/12.2227481 Funding: People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013/ under REA grant agreement No. 60838
Event Title: Micro-Structured and Specialty Optical Fibres IV
Event Type: Other
Event Location: SQUARE Brussels Meeting Centre
Event Dates: 2016-04-04 - 2016-04-06
Full Text Link: http://proceedi ... ticleid=2519521
Related URLs:
Published Date: 2016-04-03
Authors: Pospori, A. ( 0000-0003-4866-1361)
Webb, D.J. ( 0000-0002-5495-1296)

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