Ultrafast fiber Bragg grating inscription in DPDS-core doped POF using 325 nm laser

Julien Bonefacino; Tom S. Glen; Xin Cheng; Steven T. Boles; Hwa-Yaw Tam

doi:10.1117/12.2520580

16 April 2019 Ultrafast fiber Bragg grating inscription in DPDS-core doped POF using 325 nm laser

Julien Bonefacino, Tom S. Glen, Xin Cheng, Steven T. Boles, Hwa-Yaw Tam

Proceedings Volume 11029, Micro-structured and Specialty Optical Fibres VI; 110290C (2019) https://doi.org/10.1117/12.2520580
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

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.

Conference Presentation

Citation Download Citation

Julien Bonefacino, Tom S. Glen, Xin Cheng, Steven T. Boles, and Hwa-Yaw Tam "Ultrafast fiber Bragg grating inscription in DPDS-core doped POF using 325 nm laser", Proc. SPIE 11029, Micro-structured and Specialty Optical Fibres VI, 110290C (16 April 2019); https://doi.org/10.1117/12.2520580

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