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We present an energy-efficient on-chip reconfigurable computing architecture, the so-called OLUT, which is an optical core implementation of a lookup table. It offers significant improvement with respect to optical directed logic architectures, through allowing the use of wavelength division multiplexing (WDM) for computation parallelism. We performed a design space exploration that elucidates the...
Photonic devices operating in the mid-IR (3 μm to 13μm wavelength range) are of great interest for a wide range of applications, such as free-space communications, environmental monitoring or defence. Group IV-based material platforms [1], such as silicon-on-insulator (SOI)[2] and silicon-on-sapphire (SOS)[3] have attracted significant interest for mid-IR integrated photonics. However, absorption...
There is a growing interest in generating mid-infrared (mid-IR) supercontinuum (SCG) using CMOS compatible platforms for applications such as, optical coherence tomography and molecular spectroscopy [1, 2]. SCG spanning from the telecom band to the SWIR (< 3 μm) has already been achieved using silicon-based platforms such as silicon-on-insulator, silicon nitride-on-insulator and silicon-germanium-on-insulator...
Reconfigurable computing systems, e.g. FPGA, represent an increasingly attractive architectural solution for high-end supercomputing due to high aggregated computational resources, high energy-efficiency and flexibility. However, to further increase the computing bandwidth of such systems while decreasing the energy consumption, emerging technologies such as silicon photonics, are urgently needed...
The Optical LUT (OLUT) has been proposed as a parallel and energy-efficient logic architecture for building prospective on-chip optical FPGAs in order to replace traditional power-hungry electronic computing circuits. In this paper, we present a new OLUT implementation that computes a pair of complementary Boolean logic functions through wavelength multiplexing, allowing the computational capacity...
FPGA performance is limited by transistor switching time and power dissipation defined by the CMOS technology. Similarly to the case of interconnects, silicon photonics can also be leveraged to replace traditional, slow and power consuming, electrical computing circuits. In this paper we propose an all Optical LUT, an optical core implementation of LUT, which has the potential for low latency and...
Trends in SoC design are leading to 3D integration of thousands of high-performance computing resources and high-throughput interconnects, opening up new research directions for hybrid electronic/photonic architectures. In this paper, we introduce how state of the art silicon-photonic devices can realize elementary operations that are traditionally performed by electronic devices, e.g. circuit switching...
We demonstrate a silicon chip based all-optical device capable of providing single shot time-domain measurements of picosecond pulses near λ=1550nm. The 96µm long device relies on optical third harmonic generation between two pulses in a slow light photonic crystal waveguide.
We report the characterization of correlated photon pairs generated in dispersion-engineered silicon slow-light photonic crystal waveguides pumped by picosecond pulses. We found that taking advantage of the 15-nm flat-band slow-light window /30), the bandwidth for correlated photon-pair generation in 96- and 196-m-long waveguides was at least 11.2 nm, while a 396-m-long waveguide...
We demonstrate a silicon chip-based all-optical device providing single shot time-domain measurements of picosecond pulses near X=1550nm. The auto-correlation visible signal arises from third-harmonic generation in a 96 μm long slow light photonic crystal waveguide.
We report the improvement and noise analysis of correlated photon-pair generation in an ultra-compact 96 µm long dispersion-engineered silicon slow-light photonic crystal waveguide pumped by picosecond pulses. The key metrics for a photon-pair source: coincidence to accidental ratio (CAR) and pair brightness were measured to be a maximum 27 at a pair generation rate of 0.002 pair per pulse. We performed...
Nonlinear optical processes utilizing the ultrafast Kerr (χ(3)) nonlinearity provide a tool to manipulate short, picosecond long optical pulses [1], of interest for high baud rate serial communications. Increasing the nonlinear response of waveguides allows for more compact and potentially more efficient all-optical devices, with many device demonstrations in high index, highly nonlinear materials,...
We report third-harmonic generation in slow-light photonic crystal waveguides realized in chalcogenide glass membranes. This material enables a more uniform conversion along the waveguide and a higher efficiency than in comparable silicon structures.
We demonstrate error-free de-multiplexing of 160Gbit/s optical data to a 10Gbit/s data stream, exploiting slow light enhancement of four-wave mixing in an ultra-compact 96μm long, dispersion engineered silicon photonic crystal waveguide.
We generate correlated photon pairs in the telecom band from an 80 μm long dispersion-engineered silicon photonic crystal waveguide. The spontaneous four-wave mixing process producing the photon pairs is enhanced by slow light propagation.
We demonstrate a silicon-chip-based radio-frequency spectrum analyser capable of measuring terabaud optical data. We investigate application to optical performance monitoring and show that free-carrier effects have a negligible impact on device operation.
We demonstrate optical time-division de-multiplexing of 160Gbaud data via slow light enhanced four-wave mixing in a 96pm long photonic crystal waveguide. To the best of our knowledge, this represents the smallest >100Gbaud optical switching device.
We directly investigate the influence of nonlinear loss dynamics on a slow-light silicon waveguide optical limiter, mapping how the response of free carrier absorption varies as intensity changes approach the free carrier recombination time.
We demonstrate reconfigurable microfluidic photonic crystal double-heterostructure cavities by local fluid infiltration of select air holes. Properties of the microfluidic cavities are experimentally studied by evanescent coupling and analyzed by numerical simulations.
We demonstrate highly efficient evanescent coupling via a silica loop-nanowire, to ultra-small quantum-dot photonic-crystal cavities. It enables the tuning of both the Q-factor and the wavelength of the cavity mode independently.
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