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

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Title of host publicationMicro-Structured and Specialty Optical Fibres VI
EditorsKyriacos Kalli, Alexis Mendez, Pavel Peterka
ISBN (Electronic)9781510627246
Publication statusPublished - 2019
EventMicro-Structured and Specialty Optical Fibres VI 2019 - Prague, Czech Republic
Duration: 3 Apr 20194 Apr 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceMicro-Structured and Specialty Optical Fibres VI 2019
Country/TerritoryCzech Republic


  • Fiber Bragg grating
  • Photosensitive material
  • Polymer optical fiber
  • Sensing
  • Spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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