16 February 2010 Slow-light photonic crystal switches and modulators
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Proceedings Volume 7606, Silicon Photonics V; 76060N (2010) https://doi.org/10.1117/12.840948
Event: SPIE OPTO, 2010, San Francisco, California, United States
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.
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Daryl M. Beggs, Thomas P. White, Tobias Kampfrath, Kobus Kuipers, Thomas F. Krauss, "Slow-light photonic crystal switches and modulators", Proc. SPIE 7606, Silicon Photonics V, 76060N (16 February 2010); doi: 10.1117/12.840948; https://doi.org/10.1117/12.840948

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