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Proceedings Paper

Slow-light photonic crystal switches and modulators
Author(s): Daryl M. Beggs; Thomas P. White; Tobias Kampfrath; Kobus Kuipers; Thomas F. Krauss
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Paper Abstract

We discuss the performance of slow-light enhanced optical switches and modulators fabricated in silicon. The switch is based on photonic crystal waveguides in a directional coupler geometry, and the dispersion of the device is engineered to allow a switching length as short as 5 μm and rerouting of optical signals within 3 ps. The 3 ps switching time is demonstrated using free carriers in the silicon generated by the absorption of a femtosecond pump pulse. The modulator is based on a Mach-Zehnder interferometer configuration, with photonic crystal waveguides in each arm to act as phase-shifters. A flat-band slow-light region has been engineered in the phase-shifters to provide an extinction ratio in excess of 15 dB over the entire 11 nm bandwidth of the modulator device.

Paper Details

Date Published: 16 February 2010
PDF: 12 pages
Proc. SPIE 7606, Silicon Photonics V, 76060N (16 February 2010); doi: 10.1117/12.840948
Show Author Affiliations
Daryl M. Beggs, Univ. of St. Andrews (United Kingdom)
Thomas P. White, Univ. of St. Andrews (United Kingdom)
Tobias Kampfrath, FOM Institute AMOLF (Netherlands)
Kobus Kuipers, FOM Institute AMOLF (Netherlands)
Thomas F. Krauss, Univ. of St. Andrews (United Kingdom)


Published in SPIE Proceedings Vol. 7606:
Silicon Photonics V
Joel A. Kubby; Graham T. Reed, Editor(s)

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