Factors influencing the temperature sensitivity of PMMA based optical fiber Bragg gratings

Wei Zhang, David J. Webb

Research output: Chapter in Book/Report/Conference proceedingConference publication

Abstract

The Bragg wavelength of a PMMA based fiber grating is determined by the effective core index and the grating pitch, which, in temperature sensing, depend on the thermo-optic and thermal expansion coefficients of PMMA. These two coefficients are a function of surrounding temperature and humidity. Amorphous polymers including PMMA exhibit a certain degree of anisotropic thermal expansion. The anisotropic nature of expansion mainly depends on the polymer processing history. The expansion coefficient is believed to be lower in the direction of the molecular orientation than in the direction perpendicular to the draw direction. Such anisotropic behavior of polymers can be expected in drawn PMMA based optical fiber, and will lead to a reduced thermal expansion coefficient and larger temperature sensitivity than would be the case were the fiber to be isotropic. Extensive work has been carried out to identify these factors. The temperature responses of gratings have been measured at different relative humidity. Gratings fabricated on annealed and non-annealed PMMA optical fibers are used to compare the sensitivity performance as annealing is considered to be able to mitigate the anisotropic effect in PMMA optical fiber. Furthermore an experiment has been designed to eliminate the thermal expansion contribution to the grating wavelength change, leading to increased temperature sensitivity and improved response linearity.

Original languageEnglish
Title of host publicationMicro-structured and specialty optical fibres III
EditorsKyriacos Kalli, Alexis Mendez
Place of PublicationBellingham, WA (US)
PublisherSPIE
Number of pages7
ISBN (Print)978-1-62841076-1
DOIs
Publication statusPublished - 19 May 2014
EventMicro-structured and specialty optical fibres III - Brussels, Belgium
Duration: 14 Apr 201415 Apr 2014

Publication series

NameSPIE proceedings
PublisherSPIE
Volume9128
ISSN (Print)0277-786X

Conference

ConferenceMicro-structured and specialty optical fibres III
CountryBelgium
CityBrussels
Period14/04/1415/04/14

Bibliographical note

Wei Zhang and David J. Webb, "Factors influencing the temperature sensitivity of PMMA based optical fiber Bragg gratings", Micro-structured and Specialty Optical Fibres III, Kyriacos Kalli; Alexis Mendez, Editors, Proc. SPIE 9128 (2014).

Copyright 2014 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print 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/10.1117/12.2054210

Keywords

  • anisotropic expansion
  • fiber Bragg grating
  • PMMA based optical fiber
  • thermo-optic effect

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