期刊
OPTICS EXPRESS
卷 20, 期 28, 页码 29223-29236出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.20.029223
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资金
- Defense Advanced Research Projects Agency (DARPA) Microsystems Technology Office (MTO) Photonically Optimized Embedded Microprocessors (POEM) program, under the Silicon Photonic 3D-Integrated Reduced Energy Transmission (SPIRET) project [6925995]
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
In this work, we demonstrate and experimentally characterize a new class of high-performance silicon photonic modulators-the adiabatic microring modulator. The adiabatic microring modulator utilizes a vertical PN junction and interior electrical contacts, leveraging all the advantages of previously-demonstrated microdisk modulators. However, this device also incorporates an adiabatic transition from the wide, multimode contact region, to a narrow, single-mode coupling region, eliminating unwanted spatial modes common to microdisks. As a result, the adiabatic microring modulator demonstrated in this work is the smallest microring modulator demonstrated to date, with a diameter of only 4 mu m, yielding a 6.92-THz uncorrupted free spectral range. Here, we perform an experimental comparative analysis between silicon adiabatic microring modulators, silicon microdisk modulators, and a commercial lithium-niobate Mach-Zehnder modulator. We show that the silicon adiabatic microring modulator using partial doping is capable of operating at 12.5-Gb/s data rates and beyond. This device combines the best of all modulator designs, leveraging the depletion-based method to maximize the speed, utilizing the vertical-junction configuration to minimize the power consumption, employing a unique adiabatic design to eliminate higher-order modes, and using partial doping to reduce resistance, further enhancing the speed of the device. (C) 2012 Optical Society of America
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