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Proceedings Paper

Silicon photonic-wire waveguide devices
Author(s): Tao Chu; Hirohito Yamada; Shigeru Nakamura; Makoto Tojo; Yutaka Urino; Satomi Ishida; Yasuhiko Arakawa
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Paper Abstract

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 x 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 x N optical switches were Mach-Zehnder interferometer types and were also thermally controlled. The 1 x 2 switch was compact with a footprint of 85 x 30 µm2. Its maximum extinction ratio exceeded 30 dB. The switching power and switching time was about 90 mW and 100 μsec, respectively. The 1 x 4 optical switch was constructed based on the 1 x 2 switch. Its operation was successfully demonstrated. The 1 x 4 optical switch was believed to be the smallest switch in the world. A 1 x 8 optical switch was also demonstrated with its switching operations. Further, we are fabricating a compact packaged switch module with a size of 15 x 8 x 5 (height) mm3, which includes a 1 x 4 optical switch and the input and output fiber couplers assembly.

Paper Details

Date Published: 9 February 2007
PDF: 9 pages
Proc. SPIE 6477, Silicon Photonics II, 647709 (9 February 2007); doi: 10.1117/12.701519
Show Author Affiliations
Tao Chu, NEC Corp. (Japan)
Optoelectronic Industry and Technology Development Association (Japan)
Hirohito Yamada, Tohoku Univ. (Japan)
Shigeru Nakamura, NEC Corp. (Japan)
Optoelectronic Industry and Technology Development Association (Japan)
Makoto Tojo, Alnair Labs. Corp. (Japan)
Yutaka Urino, NEC Corp. (Japan)
Optoelectronic Industry and Technology Development Association (Japan)
Satomi Ishida, Univ. of Tokyo (Japan)
Yasuhiko Arakawa, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 6477:
Silicon Photonics II
Joel A. Kubby; Graham T. Reed, Editor(s)

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