High-bandwidth graded-index plastic optical fiber by the dopant diffusion coextrusion process

Makoto Asai, Ryoma Hirose, Atsushi Kondo, Yasuhiro Koike

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Today, the number of services, which includes large information contents like high-definition movies, is rapidly increasing. The graded-index plastic optical fiber (GI-POF) has been proposed as a solution. The conventional fabrication method of GI-POF, however, is unsuitable for mass production. Therefore, we propose the dopant diffusion coextrusion process for fabricating high-bandwidth GI-POF. It has been generally thought that formation mechanism of refractive-index distribution in optical polymer materials by this process would be a Fick's diffusion with constant diffusion coefficient and, therefore, has a tailing part at the core-cladding boundary. Contrary to predictions, we succeed in fabricating GI-POF with an almost optimum-index distribution. It is made evident by experiments and simulation that the formation mechanism of GI-POF by this process is a Fick's diffusion with diffusion coefficient dependent on dopant concentration. These results indicate high possibility of fabrication of high-bandwidth fibers of a polymethyl methacrylate-diphenyl sulfide system by the dopant diffusion coextrusion process.

Original languageEnglish
Pages (from-to)3062-3067
Number of pages6
JournalJournal of Lightwave Technology
Issue number10
Publication statusPublished - 2007 Oct


  • Boltzmann-Matano method
  • Co-extrusion process
  • Diffusion
  • Dopant
  • Graded index plastic optical fiber

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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