A 53-Gbit/s/ch Active Optical Cable Utilizing GI Polymer Waveguide for High-density On-board Optical Interconnects

Naohiro Kohmu, Maho Ishii, Takaaki Ishigure

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

4 Citations (Scopus)


In this paper, we propose a low loss and cost-effective assembly in optical transceiver for on-board applications by applying graded-index (GI) core polymer waveguides to effectively couple the signal light between light sources/photodetectors and multimode fibers (MMFs). In order to satisfy the requirements for higher bandwidth data transmission, on-board optical interconnects have been anticipated in datacenter networks. When applying active optical cables (AOCs) to the on-board interconnects, the assembly density between optical devices and fibers is an important issue. Hence, polymer optical waveguides with densely aligned cores are one of the promising candidates to be an interface between the active components and fibers. In this paper, GI circular core polymer optical waveguides are applied to the onboard wiring. We demonstrate the ability of GI core waveguide to achieve low-loss coupling with optical transceivers due to tightly confined optical field in the core. Furthermore, we propose to utilize the lens function of GI core in the transceiver assembly. We theoretically demonstrate that the GI core enables to improve the coupling efficiency by 0.6 dB as a cylindrical lens. Meanwhile, by just inserting a perpendicularly bent GI core waveguide between an optical transmitter and an MMF, we successfully transmit a 53.125-Gbit/s PAM4 optical signals experimentally.

Original languageEnglish
Title of host publication2019 IEEE CPMT Symposium Japan, ICSJ 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)9781728109787
Publication statusPublished - 2019 Nov
Event9th IEEE CPMT Symposium Japan, ICSJ 2019 - Kyoto, Japan
Duration: 2019 Nov 182019 Nov 20

Publication series

Name2019 IEEE CPMT Symposium Japan, ICSJ 2019


Conference9th IEEE CPMT Symposium Japan, ICSJ 2019


  • 90°-bend polymer waveguide
  • GI-core polymer waveguide
  • On-board optical interconnect
  • PAM4 optical transmission
  • active optical cable
  • cylindrical lense structure

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Industrial and Manufacturing Engineering


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