Browsing by Author "Dave, Utsav D."

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Large-scale optical phased array using a low-power multi-pass silicon photonic platform
(2020-01-20)
Miller, Steven A.
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Chang, You-Chia
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Phare, Christopher T.
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Shin, Min Chul
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Zadka, Moshe
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
Plug-and-play fiber to waveguide connector
(2019-07-22)
Gordillo, Oscar A. Jimenez
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Chaitanya, Shriddha
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Chang, You-Chia
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Dave, Utsav D.
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Mohanty, Aseema
The mass production and commercialization of integrated photonics have been slowed down by the high cost of packaging its optical interfaces. We show a plug-and-play connector between a fiber and a nanophotonic waveguide consisting of a 3D polymer structure with a fiber entrance port that simultaneously achieves mechanical and optical passive alignment with tolerance beyond +/- 10 mu m to the fiber input position. We take advantage of a mechanical and optical co-design, analogous to commercial fiber-to-fiber connectors. We fabricate the plug-and-play couplers using 3D nanoprinting directly on foundry fabricated diffraction grating couplers. We measure an average of only 0.05 dB excess coupling loss between a single mode fiber and a high confinement silicon waveguide in addition to the inherent grating coupler loss. Our coupling platform offers a passive plug-and-play solution for scalable integrated photonics fiber-chip packaging. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement