Single-photon all-optical switching using coupled microring resonators |
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Authors: | Wenge Yang Amitabh Joshi Min Xiao |
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Institution: | (1) Department of Physics, University of Arkansas, Fayetteville, AR 72701, USA;(2) Present address: School of Engineering, University of CA, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA |
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Abstract: | We study the nonlinear phase response of a microring resonator coupled to a bus waveguide and the use of this nonlinear phase
shift to store information in the microring resonator and enhance the switching characteristics of a Mach-Zehnder interferometer
(MZI). By introducing coupling between adjacent microring resonators, the switching characteristics of the MZI can be exponentially
enhanced as a function of the number of microring resonators, when compared to the linear enhancement for uncoupled resonators.
With only a few moderate-finesse microring resonators, the switching power can be reduced to attowatt level, allowing for
photonic switching devices that operate at single-photon level in ordinary optical waveguides.
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Keywords: | Microring resonator single-photon switching |
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