Control of refractive index distribution for high-bandwidth graded index plastic optical fiber

Makoto Asai, Kazuma Nehashi, Yasuhiro Koike

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The graded index plastic optical fiber (GI-POF) has been proposed as the transmission medium to realize high-speed information transmission. We have succeeded in fabricating a GI-POF by the coextrusion process, a method that allows continuous fabrication of GI-POF. Although it has been indicated that the refractive index distribution of GI-POF fabricated by this process is formed by Fick diffusion with diffusion coefficient dependent on dopant concentration, the method to control it remains unknown. The purpose of this paper is to establish the technology of controlling refractive index distribution in GI-POF fabricated by the coextrusion process. Therefore, we investigate the physical mechanism of the dependency of diffusion coefficient on dopant concentration. It has become clear that the dependency is affected by the decrease of glass transition temperature and the nonlinear increase of melt flow rate. Moreover, through simulation of dopant diffusion by our originally developed program, it has become evident that changing the molecular weight of the core and cladding material allowed control of fabricating a GI-POF with optimal refractive index distribution by this fabrication method.

Original languageEnglish
Pages (from-to)2909-2918
Number of pages10
JournalJournal of Lightwave Technology
Volume26
Issue number16
DOIs
Publication statusPublished - 2008 Aug 15

Fingerprint

plastic fibers
optical fibers
refractivity
bandwidth
diffusion coefficient
fabrication
data transmission
glass transition temperature
molecular weight
flow velocity
high speed
simulation

Keywords

  • Bandwidth
  • Equations
  • Friction
  • Heating
  • Mathematical model
  • Plastics
  • Refractive index

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Control of refractive index distribution for high-bandwidth graded index plastic optical fiber. / Asai, Makoto; Nehashi, Kazuma; Koike, Yasuhiro.

In: Journal of Lightwave Technology, Vol. 26, No. 16, 15.08.2008, p. 2909-2918.

Research output: Contribution to journalArticle

@article{73edc7dd8b374eff87069c52089df6ca,
title = "Control of refractive index distribution for high-bandwidth graded index plastic optical fiber",
abstract = "The graded index plastic optical fiber (GI-POF) has been proposed as the transmission medium to realize high-speed information transmission. We have succeeded in fabricating a GI-POF by the coextrusion process, a method that allows continuous fabrication of GI-POF. Although it has been indicated that the refractive index distribution of GI-POF fabricated by this process is formed by Fick diffusion with diffusion coefficient dependent on dopant concentration, the method to control it remains unknown. The purpose of this paper is to establish the technology of controlling refractive index distribution in GI-POF fabricated by the coextrusion process. Therefore, we investigate the physical mechanism of the dependency of diffusion coefficient on dopant concentration. It has become clear that the dependency is affected by the decrease of glass transition temperature and the nonlinear increase of melt flow rate. Moreover, through simulation of dopant diffusion by our originally developed program, it has become evident that changing the molecular weight of the core and cladding material allowed control of fabricating a GI-POF with optimal refractive index distribution by this fabrication method.",
keywords = "Bandwidth, Equations, Friction, Heating, Mathematical model, Plastics, Refractive index",
author = "Makoto Asai and Kazuma Nehashi and Yasuhiro Koike",
year = "2008",
month = "8",
day = "15",
doi = "10.1109/JLT.2008.922196",
language = "English",
volume = "26",
pages = "2909--2918",
journal = "Journal of Lightwave Technology",
issn = "0733-8724",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "16",

}

TY - JOUR

T1 - Control of refractive index distribution for high-bandwidth graded index plastic optical fiber

AU - Asai, Makoto

AU - Nehashi, Kazuma

AU - Koike, Yasuhiro

PY - 2008/8/15

Y1 - 2008/8/15

N2 - The graded index plastic optical fiber (GI-POF) has been proposed as the transmission medium to realize high-speed information transmission. We have succeeded in fabricating a GI-POF by the coextrusion process, a method that allows continuous fabrication of GI-POF. Although it has been indicated that the refractive index distribution of GI-POF fabricated by this process is formed by Fick diffusion with diffusion coefficient dependent on dopant concentration, the method to control it remains unknown. The purpose of this paper is to establish the technology of controlling refractive index distribution in GI-POF fabricated by the coextrusion process. Therefore, we investigate the physical mechanism of the dependency of diffusion coefficient on dopant concentration. It has become clear that the dependency is affected by the decrease of glass transition temperature and the nonlinear increase of melt flow rate. Moreover, through simulation of dopant diffusion by our originally developed program, it has become evident that changing the molecular weight of the core and cladding material allowed control of fabricating a GI-POF with optimal refractive index distribution by this fabrication method.

AB - The graded index plastic optical fiber (GI-POF) has been proposed as the transmission medium to realize high-speed information transmission. We have succeeded in fabricating a GI-POF by the coextrusion process, a method that allows continuous fabrication of GI-POF. Although it has been indicated that the refractive index distribution of GI-POF fabricated by this process is formed by Fick diffusion with diffusion coefficient dependent on dopant concentration, the method to control it remains unknown. The purpose of this paper is to establish the technology of controlling refractive index distribution in GI-POF fabricated by the coextrusion process. Therefore, we investigate the physical mechanism of the dependency of diffusion coefficient on dopant concentration. It has become clear that the dependency is affected by the decrease of glass transition temperature and the nonlinear increase of melt flow rate. Moreover, through simulation of dopant diffusion by our originally developed program, it has become evident that changing the molecular weight of the core and cladding material allowed control of fabricating a GI-POF with optimal refractive index distribution by this fabrication method.

KW - Bandwidth

KW - Equations

KW - Friction

KW - Heating

KW - Mathematical model

KW - Plastics

KW - Refractive index

UR - http://www.scopus.com/inward/record.url?scp=56349154431&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=56349154431&partnerID=8YFLogxK

U2 - 10.1109/JLT.2008.922196

DO - 10.1109/JLT.2008.922196

M3 - Article

VL - 26

SP - 2909

EP - 2918

JO - Journal of Lightwave Technology

JF - Journal of Lightwave Technology

SN - 0733-8724

IS - 16

ER -