Humidity responsivity of poly(methyl methacrylate)-based optical fiber Bragg grating sensors

Wei Zhang, David J. Webb

Research output: Contribution to journalArticlepeer-review


The humidity response of poly(methyl methacrylate) (PMMA)-based optical fiber Bragg gratings (POFBGs) has been studied. The characteristic wavelength of the grating is modulated by water absorption-induced swelling and refractive index change in the fiber. This work indicates that anisotropic expansion may exist in PMMA optical fiber, reducing the humidity responsivity of the grating and introducing uncertainty in the responsivity from fiber to fiber. By pre-straining a grating, one can get rid of this uncertainty and simultaneously improve the POFBG response time.
Original languageEnglish
Pages (from-to)3026-3029
Number of pages4
JournalOptics Letters
Issue number10
Early online date14 May 2014
Publication statusPublished - 15 May 2014

Bibliographical note

© 2014 Optical Society of America
This paper was published in Optics letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


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