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Compact carrier-injection photonic crystal switch for on-chip communications

Compact carrier-injection photonic crystal switch for on-chip communications

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Performances and metrics of an electro-optical wavelength switch in silicon–on- insulator technology using a 20 µm long photonic crystal directional coupler structure are theoretically studied using both electrical and finite difference time domain simulations. The possibility of photonic switching through carrier injection using a forward-biased PIN diode configuration is evaluated. It is shown that wavelength routing near λ=1550 nm with optical insertion loss of 1 dB and an electrical cut-off frequency of 60 MHz can be achieved with a bias voltage of 1 V and a dissipated electrical power of 700 µW. Integration of the device could be applied to active routing of light in silicon chips for the realisation of on-chip switching networks.

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