Abstract
In this paper, designs of electro-optical AND/NAND, OR/ NOR, XOR/XNOR logic gates based on cascaded silicon graphene switches and regular 2×1 multimode interference combiners are presented. Each switch consists of a Mach–Zehnder interferometer in which silicon slot waveguides embedded with graphene flakes are designed for phase shifters. High-speed switching function is achieved by applying an electrical signal to tune the Fermi levels of graphene flakes causing the variation of modal effective index. Calculation results show the crosstalk in the proposed optical switch is lower than −22.9dB within a bandwidth from 1510nm to 1600nm. The designed six electro-optical logic gates with the operation speed of 10Gbit/s have a minimum extinction ratio of 35.6dB and a maximum insertion loss of 0.21dB for transverse electric modes at 1.55μm.
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