Optical directional coupler based on Si-wire waveguides

Hirohito Yamada, Tao Chu, Satomi Ishida, Yasuhiko Arakawa

Research output: Contribution to journalArticlepeer-review

147 Citations (Scopus)


We fabricated optical directional couplers with Si-wire waveguides and demonstrated their fundamental characteristics. Their coupling-length was extremely short, several micrometers, because of strong optical coupling between the waveguide cores. Wavelength demultiplexing functions were also demonstrated for devices with a long coupled waveguide. Optical output from a device 800 μm long changed reciprocally with 2.5-nm wavelength spacing between the parallel and cross ports.

Original languageEnglish
Pages (from-to)585-587
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number3
Publication statusPublished - 2005 Mar


  • Demultiplexing
  • Integrated optics
  • Optical communication equipment
  • Optical directional couplers (DCs)
  • Optical planar waveguide couplers
  • Optical waveguide filters
  • Silicon-on-insulator technology
  • Wavelength-division multiplexing


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