Journal
OPTICA
Volume 7, Issue 1, Pages 3-6Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.7.000003
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Funding
- Defense Advanced Research Projects Agency [HR0011-16-C-0107]
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Optical phased arrays are a promising beam-steering technology for ultra-small solid-state lidar and free-space communication systems. Long-range, high-performance arrays require a large beam emission area densely packed with thousands of actively phase-controlled, power-hungry light emitting elements. To date, such large-scale phased arrays have been impossible to realize since current demonstrated technologies would operate at untenable electrical power levels. Here we show a multi-pass photonic platform integrated into a large-scale phased array that lowers phase shifter power consumption by nearly 9 times. The multi-pass structure decreases the power consumption of a thermo-optic phase shifter to a P-pi of 1.7 mW/pi without sacrificing speed or optical bandwidth. Using this platform, we demonstrate a silicon photonic phased array containing 512 actively controlled elements, consuming only 1.9 W of power while performing 2D beam steering over a 70 degrees x 6 degrees field of view. Our results demonstrate a path forward to building scalable phased arrays containing thousands of active elements. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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