Pressure Dependence of Fiber Bragg Grating Inscribed in Perfluorinated Polymer Fiber

Ryo Ishikawa, Heeyoung Lee, Amédée Lacraz, Antreas Theodosiou, Kyriacos Kalli, Yosuke Mizuno, Kentaro Nakamura

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


We investigate the hydrostatic pressure dependence of the Bragg wavelength of a fiber Bragg grating (FBG) inscribed in a perfluorinated graded-index (PFGI-) polymer optical fiber (POF) at 1550 nm. At 0.5 MPa, the Bragg wavelength increased with time and became almost constant 150 min later. Such a long time constant probably originates from the unique structure of the PFGI-POF, which has a thick overcladding around its core and cladding. The pressure-dependence coefficient without considering the time constant was estimated to be 1.3 nm/MPa; this is over five times the values of other types of POF-FBGs. This indicates that by removing the overcladding of the PFGI-POF, fast-response high-sensitivity pressure sensing will be feasible. Once the Bragg wavelength became constant at 0.5 MPa, the pressure-dependence coefficient of the Bragg wavelength was measured to be -0.13 nm/MPa, the absolute value of which was comparable with those of other POF-FBGs, but with an opposite sign.

Original languageEnglish
Article number8086226
Pages (from-to)2167-2170
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number24
Publication statusPublished - 2017 Dec 15
Externally publishedYes


  • Polymer optical fibers
  • fiber Bragg gratings
  • pressure sensing
  • temporal variations

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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