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We demonstrate the first all-optical carrier recovery of coherent signals using on-chip Brillouin gain, replacing digital techniques, with sub-nanosecond latency. This demonstration serves as a proof-of-concept for integrated photonic carrier recovery chips for coherent communications.
We for the first time, study the effect of signal power variations on the extinction ratio and bandwidth of on-chip Brillouin filters for applications in RF photonics and coherent optical communications. The passband extinction reduces from 35 dB to 25 dB on increasing the input signal power by 36 dB, while the bandwidth increased from 13 MHz to 30 MHz.
An optical frequency comb can generate hundreds of individual comb lines which can be employed in wavelength division multiplexing systems [1], thus reducing the cost, footprint, power consumption and system complexity when compared to using multiple lasers. However to date, comb-based communications have been limited to lower modulation formats more tolerant to phase noise, due to poor carrier to...
We present TinyOS, a flexible, application-specific operating system for sensor networks, which form a core component of ambient intelligence systems. Sensor networks consist of (potentially) thousands of tiny, low-power nodes, each of which execute concurrent, reactive programs that must operate with severe memory and power constraints. The sensor network challenges of limited resources, event-centric...
Microwave photonic filters tunable up to 30 GHz are realized on a chip using stimulated Brillouin scattering. Tailoring of the pump allows bandwidth reconfigurability from 50MHz to 440MHz with a pass band ripple of <2dB.
Comprehensive mid-IR nonlinear measurements of SiGe waveguides performed in the picosecond and femtosecond regime and compared to numerical calculations are reported. Nonlinear properties of SiGe waveguides in the mid-IR are extracted.
The mid-infrared is of great interest for a huge range of applications such as medical and environment sensors, security, defense and astronomy. I will give a broad overview of the different activities recently launched in INL Lyon, in close collaboration with several French and Australian institutions, under the umbrella of “Mid-IR integrated photonics” with a particular focus on novel integrated...
We report nonlinear measurements of SiGe waveguides in the mid-IR performed in the picosecond and femtosecond regime and compare the results to numerical calculations. Nonlinear properties of SiGe waveguides in the mid-IR are extracted.
We present single- and multifrequency Brillouin lasers based on chalcogenide photonic chip. The high Brillouin gain of chalcogenide and the small waveguide cross-section make it possible to achieve lasing in a few centimeter long waveguide.
We measure the nonlinear response of CMOS-compatible SiGe waveguides in the mid-infrared. Comparing with numerical calculations, we extract the multi-photon absorption coefficients and the induced free-carrier absorptions for wavelengths between 3µm and 5µm.
We demonstrate phase sensitive amplification based on pump-degenerate four-wave mixing in a dispersion-engineered chalcogenide waveguide. An extinction ratio of the on-chip gain of 11.4 dB is achieved by slicing the pump/signal/idler waves from a single source.
Four-wave mixing and other parametric nonlinear processes have been the subject of much research over the last decades. In particular phase sensitive amplification in optical parametric amplifiers holds great potential for signal processing in optical telecommunications, e.g. for the regeneration of phase encoded signals [1] or as potentially broadband, noiseless amplifiers [2].
The mid infrared (mid-IR, wavelength range between 2 and 10 μm) is of great interest for a huge range of applications such as medical and environment sensors, security, defense and astronomy.
Many structures containing lateral taper waveguide in previous papers showed quite high experimental loss. A vertical tapered waveguide of both rib and nanowire waveguides together with SU8 lateral tapered waveguide for mode size conversion to single mode fibre has been designed. Taper shape profile, offset tolerance have been investigated and get overlapping loss of less than 0.1 dB and 97% coupling...
We report low loss silicon-on-sapphire nanowires for applications to mid infrared optics. We achieve propagation losses of < 1dB/cm at λ=1550nm, < 1.5dB/cm at λ=2080nm and < 2dB/cm at λ = 5.08 μm.
Photonic crystal (PhC) nanocavities have attracted much attention recently for their high-Q, low-volume resonances, with applications in optical switching, cavity quantum electrodynamics, sensing, and many others. While the highest Q-factors have been reported in 2D planar photonic crystal cavities, interest has been growing in 1D waveguide nanocavities [1]. These offer many benefits over 2D cavities,...
Tellurium oxide, the main component of tellurite glasses, offers a number of advantages as emission hosts for Erbium doped waveguide amplifiers (EDWAs) over other materials because of its high refractive index (larger emission cross section and more compact devices), large emission bandwidth, low ion to ion cross relaxation, relative independence of the 1550nm Erbium lifetime on concentration, and...
Many data-intensive websites use databases that grow much faster than the rate that users access the data. Such growing datasets lead to ever-increasing space and performance overheads for maintaining and accessing indexes. Furthermore, there is often considerable skew with popular users and recent data accessed much more frequently. These observations led us to design Shinobi, a system which uses...
In this paper, we address the problem of answering continuous route planning queries over a road network, in the presence of updates to the delay (cost) estimates of links. A simple approach to this problem would be to recompute the best path for all queries on arrival of every delay update. However, such a naive approach scales poorly when there are many users who have requested routes in the system...
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