Abstract
We present a novel design method and potential application for optical
XOR, XNOR, NAND, and
OR logic gates for
binary-phase-shift-keyed signal processing devices. The devices are composed
of multi-mode interference waveguides and convert the phase information of
the input signal to amplitude at the output. We apply the finite element
method for numerical simulations, and the evaluated least ON to OFF logic-level contrast ratios for the XOR, XNOR, NAND, and OR logic gates are 21.5 dB, 21.5 dB,
22.3 dB, and 22.3 dB, respectively. The proposed logic gates are extremely
promising signal processing devices for binary-phase-shift-keyed signals in
packet switching systems.
© 2011 IEEE
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