Si photonic wire waveguide devices

Hirohito Yamada, Tao Chu, Satomi Ishida, Yasuhiko Arakawa

Research output: Contribution to journalArticlepeer-review

160 Citations (Scopus)


Si photonic wire waveguides are attractive for constructing various optical devices that are extremely small because the waveguides can be bent with extremely small curvatures of less than a few micrometers of bending radius. We have fabricated optical directional couplers with the waveguides and demonstrated their fundamental characteristics. Their coupling length was extremely short, several micrometers, because of strong optical coupling between the waveguide cores. We have also demonstrated wavelength-demultiplexing functions for these devices with a long coupled waveguide. Optical outputs from a device with a 100-μtm-long coupled waveguide changed reciprocally with a 20-nm wavelength spacing between the parallel and cross ports. We also demonstrated the operation of ultrasmall optical add-drop multiplexers (OADMs) with Bragg grating reflectors made up of the waveguides. The dropping wavelength bandwidth of the OADMs was less than 0.7 nm, and these dropping wavelengths could be precisely designed by adjusting the grating period. Using the Si photonic wire waveguide, we have also demonstrated thermooptic switches. Metal thin-film heaters were evaporated onto the branch of a Mach-Zehnder interferometer that incorporated the waveguide to achieve switching operations by thermo-optic effects. In these switching operations, we observed more than 30 dB of extinction ratio, less than 90 mW of switching power, and less than 100 μs of switching speed.

Original languageEnglish
Pages (from-to)1371-1378
Number of pages8
JournalIEEE Journal of Selected Topics in Quantum Electronics
Issue number6
Publication statusPublished - 2006 Nov


  • Integrated optics
  • Lightwave circuit
  • Optical add-drop multiplexer (OADM)
  • Optical directional coupler
  • Optical interconnection
  • Optical switch
  • Optical waveguide
  • Si-wire thermo-optic effects
  • Silicon-on-insulator (SOI)


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