Polymer optical fiber Bragg grating acting as an intrinsic biochemical concentration sensor

Wei Zhang, David Webb, Gang-Ding Peng

Research output: Contribution to journalArticlepeer-review


We demonstrate an intrinsic biochemical concentration sensor based on a polymer optical fiber Bragg grating. The water content absorbed by the polymer fiber from a surrounding solution depends on the concentration of the solution because of the osmotic effect. The variation of water content in the fiber causes a change in the fiber dimensions and a variation in refractive index and, therefore, a shift in the Bragg wavelength. Saline solutions with concentration from 0% to 22% were used to demonstrate the sensing principle, resulting in a total wavelength shift of 0.9 nm, allowing high-resolution concentration measurements to be realized.
Original languageEnglish
Pages (from-to)1370-1372
Number of pages3
JournalOptics Letters
Issue number8
Publication statusPublished - 15 Apr 2012

Bibliographical note

© 2012 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: http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-8-1370. 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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