Densely-aligned graded-index multiple-core polymer optical waveguide: Fabrication and inter-channel crosstalk property

Takaaki Ishigure, Kenshiro Matsuo, Yosuke Nitta, Yusuke Sugimori, Shin Morikawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present two methods for fabricating densely-aligned graded-index (GI) multiple-core polymer optical waveguides utilizing soft-lithography and dispensers. For on-board optical interconnects with polymer waveguides, much higher data rate and channel density have been required in the past few years. However, because of the high scattering loss of polymer waveguides, their inter-channel crosstalk is of great concern, when narrower pitch is required. Meanwhile, we have demonstrated low propagation loss and low inter-channel crosstalk of polymer optical waveguides with GI cores due to the optical confinement effect of the GI-core. Hence, the channel density could be increased for GI multiple-core waveguides. In this paper, we successfully fabricate a polymer waveguide with GI cores directly on a substrate utilizing the soft-lithography method or a dispenser. We experimentally confirm that near parabolic refractive index profiles are formed in the parallel cores with 50 μm × 30 μm size at 125-μm pitch in a length of 20 cm. We also use a copolymer for forming the GI profile, and then, confirm the high-temperature stability of the parabolic index profile compared to the one formed with a doped polymer. Finally, we discuss the crosstalk properties of the fabricated waveguides.

Original languageEnglish
Title of host publicationOptoelectronic Interconnects and Component Integration XI
Publication statusPublished - 2011
EventOptoelectronic Interconnects and Component Integration XI - San Francisco, CA, United States
Duration: 2011 Jan 242011 Jan 26

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherOptoelectronic Interconnects and Component Integration XI
Country/TerritoryUnited States
CitySan Francisco, CA


  • Dispenser
  • Inter-channel crosstalk
  • On-board optical interconnection
  • Polymer optical waveguide with graded-index cores
  • Soft-lithography

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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