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Proceedings Paper

Ultrafast fiber Bragg grating inscription in DPDS-core doped POF using 325 nm laser
Author(s): Julien Bonefacino; Tom S. Glen; Xin Cheng; Steven T. Boles; Hwa-Yaw Tam
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Paper Abstract

A novel core dopant called diphenyl disulphide is used in PMMA-based fibers, permitting both increase of the refractive index of the fiber, together with good photosensitivity. FBGs can be inscribed in these single mode fibers within 7 ms using 325 nm laser and exhibit significant growth post-UV irradiation. In the present work, we investigate the grating growth behavior upon long UV irradiation time. Furthermore, we demonstrate the fabrication of fiber Bragg gratings with irradiation time ranging from 7 ms up to 10 s using a 325 nm laser and we investigate their growth post UV irradiation over 7 months. It is demonstrated that all the FBGs exhibit over 10 dB growth within the several month post-UV irradiation period. Raman spectroscopy measurements were carried out for several months on thin films post-UV irradiation, and significant changes in the molecular bounds of both diphenyl disulphide and PMMA are recorded, establishing the UV induced photo-chemical reaction responsible for the FBG growth. Finally, the reliability of the novel core dopant and the potential use of the fiber for in-vivo sensing was investigated by using humidity cycling at temperatures near the human body core temperature.

Paper Details

Date Published: 16 April 2019
PDF: 10 pages
Proc. SPIE 11029, Micro-structured and Specialty Optical Fibres VI, 110290C (16 April 2019); doi: 10.1117/12.2520580
Show Author Affiliations
Julien Bonefacino, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Tom S. Glen, The Univ. of Edinburgh (United Kingdom)
Xin Cheng, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Steven T. Boles, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Hwa-Yaw Tam, The Hong Kong Polytechnic Univ. (Hong Kong, China)

Published in SPIE Proceedings Vol. 11029:
Micro-structured and Specialty Optical Fibres VI
Kyriacos Kalli; Alexis Mendez; Pavel Peterka, Editor(s)

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