Towards athermal optically-interconnected computing system using slotted silicon microring resonators and RF-photonic comb generation |
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Authors: | Linjie Zhou Ken Kashiwagi Katsunari Okamoto R P Scott N K Fontaine Dan Ding Venkatesh Akella and S J B Yoo |
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Affiliation: | (1) Department of Electrical and Computer Engineering, University of California, Davis, CA 95616, USA;(2) Department of Electronic Engineering, Graduate School of Engineering, University of Tokyo, Bunkyo Tokyo, 113-0033, Japan |
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Abstract: | We report that completely athermal design of a slotted silicon waveguide is possible by combining the negative thermo-optic
(TO) coefficient of, for example, polymethyl methacrylate (PMMA) with the positive TO coefficient of silicon. When used in
a microring resonator structure, the filled overcladding slotted waveguide and the unfilled (air-filled) overcladding slotted
waveguide can both achieve athermal characteristics. Simulations indicate a wide range of realizations with proper design
parameters of the slotted waveguides, namely, the silicon strip and slot widths. Preliminary experimental results on fabricated
devices demonstrate that the temperature dependence is reduced from 91 pm/°C for a regular microring resonator to 52 pm/°C
for the PMMA-clad microring resonator. Completely athermal realization is expectable in similar devices with improved fabrication
techniques. For the external optical source, we demonstrate a stable 3.5 THz wide (175 modes×20 GHz) optical comb source with
nearly flat spectral phase. Adjustable mode spacing and wavelength tunability across the C-band are maintained so that comb
lines can be matched to the specified wavelength grid of the computing system. With such schemes, temperature controls of
individual optical components in the optically interconnected computing chips become unnecessary, greatly reducing the complexity
of the computing system. |
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Keywords: | PACS" target="_blank">PACS 42 82 Ds 42 79 Ta 42 72 Ai |
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