Fabrication of high glass transition temperature graded-index plastic optical fiber: Part 1- Material preparation and characterizations

Ryosuke Nakao, Atsushi Kondo, Yasuhiro Koike

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


With a view to fabricating high glass transition temperature (T g) graded-index plastic optical fiber (GI POF) by the coextrusion process, core material consisting of copolymer of 2,2,2-trichloroethyl methacrylate (TCEMA) and N-cyclohexyl maleimide (cHMI) (P(TCEMA-co-cHMI)), and diphenyl sulfide (DPS) as dopant was newly developed. Although homo polymer of TCEMA (PTCEMA) possesses high T g and high transparency, it was found that PTCEMA began depolymerization at ca. 200 \circ C, which means that PTCEMA-based GI POF fabricated by the coextrusion process has low T g due to depolymerized monomer. By copolymerizing TCEMA with cHMI (5 mol%), the rate of weight loss at constant temperature T = 230°C was drastically decreased (15 wt%/hr). Moreover, the T g linearly increased from 130°C to 197 \circ C with increasing cHMI composition ratio from 0 to 62 wt%, respectively. Scattering loss of the copolymer was increased with the increase of cHMI composition ratio due to the refractive index difference between PTCEMA and PcHMI. It was found that the increment of the scattering loss was suppressed significantly when the copolymer includes DPS (120 dB/km decrease by adding 4 wt% DPS for the copolymer including 5 mol% cHMI). From these results, P(TCEMA-co-cHMI)-based core material was thought to be a promising candidate for high T g GI POF.

Original languageEnglish
Article number6125204
Pages (from-to)247-251
Number of pages5
JournalJournal of Lightwave Technology
Issue number2
Publication statusPublished - 2012


  • Graded index plastic optical fiber
  • high glass transition temperature
  • poly(2,2,2-trichloroethyl methacrylate-co-N- cyclohexyl maleimide)
  • thermal degradation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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