Abstract
We present a theoretical model to analyze all-optical switching by two-photon
absorption induced free-carrier injection in silicon 2 × 2 add-drop microring
resonators. The theoretical simulations are in good agreement with experimental results.
The results have been used to design all-optical ultrafast (i) reconfigurable
De-multiplexer/Multiplexer logic circuits using three microring resonator switches and
(ii) universal, conservative and reversible Fredkin and Toffoli logic gates with only
one and two microring resonator switches respectively. Switching has been optimized for
low-power (25 mW) ultrafast (25 ps) operation with high modulation depth (85%) to enable
logic operations at 40 Gb/s. The combined advantages of high Q-factor, tunability,
compactness, cascadibility, reversibility and reconfigurability make the designs
favorable for practical applications. The proposed designs provide a new paradigm for
ultrafast CMOS-compatible all-optical reversible computing circuits in
silicon.
© 2014 IEEE
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