Journal
OPTICS EXPRESS
Volume 28, Issue 17, Pages 24874-24888Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.400716
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Funding
- Canada Research Chairs
- Natural Sciences and Engineering Research Council of Canada
- Air Force Office of Scientific Research [FA9550-17-1-0354, FA9550-19-1-0341]
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We propose a U-shaped pn junction in a silicon-on-insulator microdisk resonator to effectively double the junction-mode overlap in the state-of-the-art, vertical pn junction microdisk electro-optical (EO) modulators. The U-shaped pn junction promotes the maximum overlap between the junction depletion zone and the whispering gallery optical mode in the microdisk. By fully depleting the p region of the npn-sequenced U-junction, the capacitance is reduced below 3 IF, which significantly improves the speed and power performance. In this work, we implement the high-efficiency, depleted U-junction design to maximize the operating bandwidth of EO modulators, EO logic elements, EO 2 x 2 switches for wavelength-division cross-connects, 2 x 2 reconfigurable optical add-drop multiplexers, optical-to-electrical-to-optical (OEO) repeaters-with-gain, OEO wavelength converters, and 2 x 2 optical-optical logic gates. These devices all operate in the 7.6-to-50 GHz bandwidth range with ultralow energy consumption between 0.4 and 9.8 fl/bit. By using CMOS-compatible materials and fabrication-feasible design dimensions, our proposed high-performance devices offer a promising potential in next-generation, high-volume electro-optical communications and computing circuits. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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