Silicon photonic-wire waveguide devices

Tao Chu, Hirohito Yamada, Shigeru Nakamura, Makoto Tojo, Yutaka Urino, Satomi Ishida, Yasuhiko Arakawa

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

7 Citations (Scopus)


Silicon photonic-wire waveguide is one of the most promising platforms in constructing compact optical devices, since the waveguide can be bent with a radius of less then several microns. Recently, we have demonstrated various optical devices based on silicon photonic-wire waveguides, which include a directional coupler, a tunable optical add-drop multiplexer, and some ultra-compact 1 × N optical switches. The optical coupling length of the directional coupler was just around 10 microns, due to its high coupling efficiency. The tunable optical add-drop multiplexer was constructed with Bragg grating waveguides. It was about 700-μm-long, and was controlled through thermo-optic effect. The maximum center-wavelength shift of the tunable optical add-drop multiplexer was 6.6 nm, which was obtained at a tuning power of 0.82 W. The 1 × N optical switches were Mach-Zehnder interferometer types and were also thermally controlled. The 1 × 2 switch was compact with a footprint of 85 × 30 μm2. Its maximum extinction ratio exceeded 30 dB. The switching power and switching time was about 90 m W and 100 μsec, respectively. The 1 × 4 optical switch was constructed based on the 1 × 2 switch. Its operation was successfully demonstrated. The 1 × 4 optical switch was believed to be the smallest switch in the world. A 1 × 8 optical switch was also demonstrated with its switching operations. Further, we are fabricating a compact packaged switch module with a size of 15 × 8 × 5 (height) mm3, which includes a 1 × 4 optical switch and the input and output fiber couplers assembly.

Original languageEnglish
Title of host publicationSilicon Photonics II
Publication statusPublished - 2007 May 24
EventSilicon Photonics II - San Jose, CA, United States
Duration: 2007 Jan 222007 Jan 24

Publication series

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


OtherSilicon Photonics II
Country/TerritoryUnited States
CitySan Jose, CA


  • Integrated optics
  • MachZehnder interferometer
  • Optical add-drop multiplexer (OADM)
  • Optical switch
  • Silicon photonic wire
  • Silicon photonics
  • Thermo-optic effects

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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