High-thermally stable and high-bandwidth graded index plastic optical fiber for vehicle networks

Makoto Asai, Yasushi Yamaki, Satoshi Takahashi, Yasuhiro Koike

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Radial refractive index profiles within the graded index plastic optical fiber (GI-POF) is formed by adding a dopant to a polymer. This addition of the dopant significantly decreased the Tg of the polymer due to the plasticization. This disadvantage made the installation of the GI-POF difficult, especially in vehicle networks in which high thermal stability is required. We have suggested 9-bromophenanthrene (BPT) as a novel dopant induced less plasticization for poly(methyl methacrylate) (PMMA) than the conventional dopants. However, although the fabricated GI-POF using BPT had high enough thermal stability for vehicle networks, the attenuation was 800 dB/km and it could not be used. This high attenuation was caused by contaminant in the fabrication process of fibers. In this study, we succeeded to fabricate a GI-POF with low-attenuation and high-thermal stability using highly pure BPT. Its attenuation was improved to 240 dB/km at 650 nm, which was enough transparency for vehicle networks. The Tg of the GIPOF was improved to 107 °C from 90 °C. The thermal stability of the GI-POF below 85 °C/dry and 75 °C/85%RH was demonstrated to be as high as that of the commercially available step index POF. The bandwidth of the GI-POF could be estimated over 4.0 GHz for the 50-m fiber. These results demonstrated that our GI-POF should qualify to be used in vehicle network.

Original languageEnglish
Pages (from-to)1464-1469
Number of pages6
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number20
Publication statusPublished - 2011 Oct 15


  • fibers
  • glass transition
  • high performance polymers
  • high temperature materials
  • optics
  • refractive index
  • thermal properties
  • thermal stability

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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