Phase-shifted Bragg grating inscription in PMMA microstructured POF using 248 nm UV radiation

Pereira, L., Pospori, A., Antunes, Paulo, Domingues, Maria Fatima, Marques, S., Bang, Ole, Webb, David J. and Marques, Carlos A.F. (2017). Phase-shifted Bragg grating inscription in PMMA microstructured POF using 248 nm UV radiation. Journal of Lightwave Technology, 35 (23), pp. 5176-5184.

Abstract

In this work we experimentally validate and characterize the first phase-shifted polymer optical fiber Bragg gratings (PS-POFBGs) produced using a single pulse from a 248 nm krypton fluoride laser. A single-mode poly (methyl methacrylate) optical fiber with a core doped with benzyl dimethyl ketal for photosensitivity improvement was used. A uniform phase mask customized for 850 nm grating inscription was used to inscribe these Bragg structures. The phase shift defect was created directly during the grating inscription process by placing a narrow blocking aperture in the center of the UV beam. The produced high-quality Bragg grating structures, presenting a double dips, reject 16.3 dB (97.6% reflectivity) and 13.2 dB (95.2% reflectivity) of the transmitted power, being therefore appropriate for sensing or other photonic applications. Its transmission spectrum possesses two sharp transmission notches, allowing a significant increase in measurement resolution compared to direct interrogation of a single grating. The reflection and transmission spectra when multiple phase shifts are introduced in the FBG structure are also shown. The PS-POFBG's strain, temperature, pressure, and humidity characteristics have been experimentally analyzed in detail to assess their potential usage as sensors.

Publication DOI: https://doi.org/10.1109/JLT.2017.2771436
Divisions: Engineering & Applied Sciences > Institute of Photonics
Engineering & Applied Sciences > Electrical, electronic & power engineering
Aston University (General)
Additional Information: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Funding: Fundac¸ ˜ao para a Ciˆencia e Tecnologia (FCT)/MEC through national funds and when applicable co-funded by FEDER – PT2020 partnership agreement under Project UID/EEA/50008/2013, FCT through the fellowships SFRH/BPD/109458/2015 and SFRH/BPD/101372/2014
Uncontrolled Keywords: Fiber Bragg gratings,Fiber gratings,Fiber lasers,Gratings,notch filter,Optical fiber sensors,Optical fibers,optical filtering,Polymer optical fiber sensors,ultrasonic detection,Atomic and Molecular Physics, and Optics
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2017-11-07
Authors: Pereira, L.
Pospori, A.
Antunes, Paulo
Domingues, Maria Fatima
Marques, S.
Bang, Ole
Webb, David J. ( 0000-0002-5495-1296)
Marques, Carlos A.F.

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