Silicon Photonics

Our research interest areas in silicon photonics that offers complementary advantages to silicon electronics. Together they produce significantly superior systems. We have an active program in this research area with focus on both analog and digital silicon nano-photonics and electronics co-integration. Some of the imposed limits by electronic process technologies (such as silicon-based technologies) in RF, mm-wave, and sub-mm-wave designs can be overcome using photonic devices and techniques. For instance, low loss optical delays and high quality factor resonators available in the photonic integrated circuits can be used to perform optically assisted electrical signal processing. Also, the availability of large band-width around the high carrier frequency of optical fields enables the use of optical mediums as high data-rate chip-to-chip or board-to-board interconnects. Examples of optically assisted electronics are integrated low phase noise opto-electronic oscillators and optically driven mm-wave radiators. Moreover, utilizing the advanced electronic circuit and system techniques together with near zero cost of integrated transistors in high node technologies can significantly improve the performance of photonic systems. Examples are RF assisted phase noise reduction of semiconductor lasers and electronically controlled optical phased arrays.

Visible spectrum waveguiding in bulk CMOS
A compact silicon photonic quantum coherent receiver with deterministic phase control

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Subtractive Photonics in Bulk CMOS

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Subtractive Photonic Waveguide-Coupled Photodetectors in 180nm Bulk CMOS

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Performance Limits of Sub-Shot-Noise-Limited Balanced Detectors

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Large-Scale Thermo-Optic Phase Shifter Array with Feedback Photodiodes

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Large-Scale Crosstalk-Corrected Thermo-Optic Phase Shifter Arrays in Silicon Photonics
Achieving full grating-lobe-free field of view with low-complexity co-prime photonic beamforming transceivers

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Foundry-fabricated grating coupler demultiplexer inverse-designed via fast integral methods
Discretization of annular-ring diffraction pattern for large-scale photonics beamforming

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Optically Synchronized Phased Arrays in CMOS
IQ Photonic Receiver for Coherent Imaging With a Scalable Aperture

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A Compact, Low-Drive-Voltage Mach-Zehnder Modulator Using Serially-Coupled Rings

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Breaking FOV-Aperture Trade-Off With Multi-Mode Nano-Photonic Antennas
Subtractive photonics
A Silicon Photonics Computational Lensless Active-Flat-Optics Imaging System
Computational aberration correction of VIS-NIR multispectral imaging microscopy based on Fourier ptychography

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A Nonuniform Sparse 2-D Large-FOV Optical Phased Array With a Low-Power PWM Drive
A Wideband On-Chip Radiator Driven by a Traveling-Wave Photodetector

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A Photodetector-Driven Coherent RF Array with Wide Tuning Range

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