Title :
All-Optical Ultrafast Switching in 2 × 2 Silicon Microring Resonators and its Application to Reconfigurable DEMUX/MUX and Reversible Logic Gates
Author :
Sethi, Preeti ; Roy, Sandip
Author_Institution :
Dept. of Phys. & Comput. Sci., Dayalbagh Educ. Inst., Agra, India
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.
Keywords :
CMOS logic circuits; Q-factor; demultiplexing equipment; elemental semiconductors; high-speed optical techniques; integrated optoelectronics; logic design; logic gates; micro-optomechanical devices; micromechanical resonators; microswitches; multiplexing equipment; optical communication equipment; optical design techniques; optical logic; optical modulation; optical resonators; optical switches; silicon; Q-factor; Si; all-optical ultrafast reconfigurable demultiplexer-multiplexer logic circuits; all-optical ultrafast switching; bit rate 40 Gbit/s; conservative Fredkin logic gates; conservative Toffoli logic gates; logic operations; low-power ultrafast operation; microring resonator switches; modulation depth; power 25 mW; reconfigurable DEMUX-MUX; reversible Fredkin logic gates; reversible Toffoli logic gates; reversible logic gates; silicon add-drop microring resonators; theoretical model; time 25 ps; two-photon absorption induced free-carrier injection; ultrafast CMOS-compatible all-optical reversible computing circuits; universal Fredkin logic gates; universal Toffoli logic gates; IP networks; Optical ring resonators; Optical switches; Probes; Silicon; Ultrafast optics; Coupled mode analysis; integrated optics; optical computing; optical logic devices; optical resonators; optical switches; silicon; switching circuits; ultrafast optics;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2014.2315670
