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Compact Optical Switches and Modulators Based on Dispersion Engineered Photonic Crystals

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6 Author(s)
O'Faolain, L. ; Sch. of Phys. & Astron., Univ. of St Andrews, St. Andrews, UK ; Beggs, D.M. ; White, T.P. ; Kampfrath, T.
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We use slow-light photonic crystals to enhance optical switching and modulation in silicon. By using dispersion-engineered designs, a switch as short as 5 ??m was achieved, in which we have demonstrated rerouting of optical pulses on a 3-ps time scale through the absorption of a femtosecond pulse. We additionally demonstrate a modulator with a Mach-Zehnder interferometer (MZI) configuration with flat-band slow-light photonic crystal phase shifters that is designed to give a large group-index-bandwidth product. An extinction ratio in excess of 15 dB is obtained over the entire 11-nm bandwidth of the modulator.

Published in:

Photonics Journal, IEEE  (Volume:2 ,  Issue: 3 )

Date of Publication:

June 2010

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