We propose an all-optical switching scheme based on Raman gain in a silicon nanowaveguide suitable for multichannel optical communication. Raman gain is used for amplification of a control pulse with a higher wavelength, which depletes the tuned channel signal. Separation between control and signal pulses should be equal to the Raman shift in silicon. By employing a $3\mathrm{mm}$ channel nanowaveguide, we demonstrate a channel attenuation of about $12\mathrm{dB}$, while the suppression ratios for the first and second neighboring channels are about $1.6\mathrm{dB}$ and $1\mathrm{dB}$, respectively. This scheme can be used as an all-optical switch in dense wavelength division multiplexing networks. Moreover, we demonstrate that the depleted channel can be retrieved by a control pulse with lower wavelength in which the pulse amplifies the channel in contrast to the prior situation.

© 2012 Optical Society of America

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