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We demonstrate 1.25-Gb/s all-optical NAND/AND logic gates in a hydrogenated amorphous silicon waveguide via four-wave mixing Bragg scattering with only 85-mW peak pump powers in the waveguide.
We demonstrate encrypted two-party communications using a physically-secure one time pad incorporating two CMOS-compatible chaotic silicon photonic microcavities.
We propose infrared neural stimulation as an application for end-fire integrated optical beam steering devices. We show some initial results and discuss its implications for the future development of the technique.
We demonstrate compressive measurement of sparse radio frequency signals using multimode silicon photonic microcavities as pseudorandom filters. A compression ratio of 8% is achieved for 24 filter patterns.
We present a comprehensive ray tracing analysis of a novel photonic physical unclonable function (PUF) based upon the ultrafast nonlinear optical interactions in a silicon chaotic micro-cavity exploited for secure authentication and communication. The cavity's design exhibits complex chaotic behavior that ensures extreme sensitivity to the precise physical structure made unique through fabrication...
We demonstrate 7 dB signal depletion in a hydrogenated amorphous silicon waveguide via four-wave mixing Bragg scattering with only 280 μW total pump power in the waveguide. The bandwidth is larger than 4 nm.
We demonstrate thermo-optically controlled beam steering in an end-fire silicon waveguide array capable of steering over an angular range of 16.4° at a rate of 100 Hz.
We demonstrate a cryptographic primitive and authentication system based on the ultrafast response of reverberant integrated photonic cavities formed in silicon, which leverage the unpredictability of leaky chaotic systems.
We demonstrate a scalable array of end-firing silicon waveguides as a platform for high-speed, high-power operation beam-steering applications. We fabricate devices, culminating in 16×1 arrays with a measured central lobe FWHM of 7°±0.6°.
We generate a 790-nm wide Mid-IR supercontinuum, spanning from 1.63 μm to 2.42 μm, in a hydrogenated amorphous silicon waveguide. The pump source is a 160-fs Thulium doped fiber laser centered at 1910 nm.
We demonstrate a high speed all-optical NAND gate based on four-wave mixing Bragg scattering in highly nonlinear fiber. A 15.2-dB depletion of the signal is obtained and time domain measurements show 10-Gb/s NAND operation.
We demonstrate phase-sensitive amplification in hydrogenated amorphous silicon waveguides based on pump-degenerate four-wave mixing at 90 MHz and 10 GHz. An 11.7 dB (6.6 dB) phase-sensitive extinction ratio is achieved at 90 MHz (10 GHz).
High nonlinearity, low or negligible two-photon absorption, and CMOS-compatibility make hydrogenated amorphous silicon an attractive platform for integrated nonlinear optical signal processing devices. Recent nonlinear optical demonstrations are discussed as well as material property investigations.
We demonstrate a high-speed all-optical NAND gate based on four-wave mixing Bragg scattering in highly nonlinear fiber. A 15.2-dB depletion of the signal is obtained and time domain measurements show 10-Gb/s NAND operation.
Highly nonlinear CMOS-compatible hydrogenated amorphous silicon (a-Si:H) waveguides are studied for broad bandwidth and low-power parametric processing. Utilizing its favorable nonlinear properties, optical parametric amplification and oscillation are demonstrated.
We utilize a coherent optical comb generator to accomplish source-efficient wavelength multicasting via four-wave mixing in both a highly-nonlinear fiber and a silicon nanowaveguide. We demonstrate 23 multicast channels with error-free operation at 10-Gb/s.
We demonstrate for the first time optical parametric amplification (OPA) operating at GHz rate in near-IR using hydrogenated amorphous silicon waveguide. The strong gain at this repetition rate shows its potential for telecommunication applications and a GHz-rate optical parametric oscillator.
Utilizing a 6-mm-long hydrogenated amorphous silicon nanowaveguide, we demonstrate error-free (BER <; 10-9) 160-to-10 Gb/s OTDM demultiplexing using ultralow switching peak powers of 50 mW. This material is deposited at low temperatures enabling a path toward multilayer integration and therefore massive scaling of the number of devices in a single photonic chip.
We report measurements of the non-instantaneous nonlinear response of hydro-genated amorphous silicon nanowire waveguides at telecommunications wavelengths. We compare the results to those obtained with similar crystalline silicon nanowires.
We demonstrate frequency-resolved optical gating using four-wave mixing in a hydrogenated amorphous silicon nanowaveguide. The ultrahigh nonlinearity and the wide conversion bandwidth of this device allow characterization of sub-ps pulses with high sensitivity.
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