Optical-electrical hybrid signal equalizer for ultra-high-speed transmission

Shinya Maruyama, Kazunari Tomishige, Atsushi Kanno, Tetsuya Kawanishi, Hideyuki Sotobayashi

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


We demonstrate an optical-electrical hybrid equalizer, which comprises an optical domain equalizer fabricated using optical filter banks and an electrical filter in a digital domain by a digital signal processing, to experimentally demodulate degraded 40-Gbaud quadrature phase-shift keying (QPSK) signal. The optical signal-to-noise ratio (OSNR) required for a BER of 1 × 10-3 is improved to 7 dB without an optical equalizer (OEQ) under the back-to-back condition. The fluctuation in the OEQ strength between 0-6 dB will not affect signal quality significantly. The signal degradation caused by the frequency response of devices was minimized using by the hybrid equalizer.

Original languageEnglish
Title of host publicationOptical Metro Networks and Short-Haul Systems VII
EditorsAtul K. Srivastava, Benjamin B. Dingel, Achyut K. Dutta
ISBN (Electronic)9781628414783
Publication statusPublished - 2015 Jan 1
Externally publishedYes
EventOptical Metro Networks and Short-Haul Systems VII - San Francisco, United States
Duration: 2015 Feb 102015 Feb 12

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherOptical Metro Networks and Short-Haul Systems VII
Country/TerritoryUnited States
CitySan Francisco


  • Optical communication
  • Optical equalizer
  • Optical transmission system
  • Quadrature phase-shift keying (QPSK)

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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