Characterization of polymer fiber Bragg grating with ultrafast laser micromachining

Chen Liu, Marcos R. Cardoso, Wei Zhang, Xianfeng Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We report that the main photosensitive mechanism of poly(methyl methacrylate)-based optical fiber Bragg grating (POFBG) under ultraviolet laser micromachining is a complex process of both photodegradation and negative thermo-optic effect. We found experimentally the unique characteristics of Bragg resonance splitting and reunion during the laser micromachining process providing the evidence of photodegradation, while the mean refractive index change of POFBG was measured to be negative confirming further photodegradation of polymer fiber. The thermal-induced refractive index change of POFBG was also observed by recording the Bragg wavelength shift. Furthermore, the dynamic thermal response of the micromachined-POFBG was demonstrated under constant humidity, showing a linear and negative response of around -47.1 pm/°C.

Original languageEnglish
Pages (from-to)1450-1453
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number13
Early online date14 Apr 2016
Publication statusPublished - 1 Jul 2016

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  • Bragg grating
  • fiber optics
  • fiber sensor
  • photodegradation
  • photosensitivity
  • PMMA
  • polymer optical fiber


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