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Semiconductor quantum dots are often proposed as an ideal means to achieve non-linear interactions and photon switching in semiconductor integrated circuits. We examine here the use of the electron spin degree of freedom as a means to achieve a controllable quantum switching of single photons and trains of photons. We examine some types of spin-based quantum switches, and the design principles upon...
Tripartite entangled states, such as Greenberger-Horne-Zeilinger (GHZ) and W states, are appealing for tests of fundamental aspects of quantum mechanics, as well as for implementations of quantum communication protocols. While the information is typically encoded in the polarization or path of the photons, we propose a feasible scheme to generate W states that are entangled in the energy degree of...
We report on the design, fabrication and electro-optical characterization at T = 2.9 K of a photon number resolving detector designed to obtain a pulse-position resolution. This pulse-position-resolving detector (PPRD) is based on the spatial multiplexing of four superconducting nanowire avalanche photodiodes (SNAPs) [8, 9] connected in series. We choose to exploit the 2-SNAP configuration (i.e.,...
This conference talk will sum up our recent contributions related to the integration of semiconductor carbon nanotubes (s-SWNTs) as an active material in silicon photonics. This work is motivated by the possible use of s-SWNTs for light emission, detection, and modulation relying on the same hybrid on-silicon integration platform. We will first describe experimental results carried out to prepare...
Beyond 100Gbit/s wireless connectivity is appreciated in many scenarios, such as big data wireless cloud, ultrafast wireless download, large volume data transfer, etc. In this paper, we will present our recent achievements on beyond 100Gbit/s ultrafast terahertz (THz) wireless links enabled by THz photonics.
Optical modulation in the O-Band using a Mach-Zehnder modulator in push-pull configuration is presented and experimentally demonstrated. Open eye diagrams at 25 GBps have been obtained with more than 8 dB extinction ratio with an active length of only 1 mm.
In this paper is presented a new multi-mode interference MMI polarization splitter for Photonic Integrated Circuits PICs. It was designed using the Fraunhofer Heinrich-Hertz-Institut (HHI) commercial multilayer waveguide in Fe doped InP E1700. The central operation wavelength for what this device was designed is 1534 nm. This device can be very useful in the new communication networks for example...
Light propagation with ultra-low speeds is a highly sought-out target in modern photonics research, because of its strong impact in applications like all-optical circuitry, memories and energy efficient chip-scale sources. However, for slow light to be relevant to these applications it must be accompanied by a strong enhancement in both the EM energy density and the electric field. Although intuitively...
In this paper, we present the latest experimental work on millimetre-wave links operating at fiber-like capacity regimes: from UWB communications supporting up to 35 Gbit/s to D-band communications operating at 352 Gbit/s. We provide insights on these technologies and hints on next steps to achieve 1 Tbit/s in the air.
Based on analogy between quantum mechanics and the classical electrodynamics, we sorted dielectric microspheres with almost identical positions of their whispering gallery mode (WGM) resonances as photonic atoms. Such microspheres were assembled in a wide range of structures including linear chains and planar photonic molecules. We studied WGM hybridization effects in such structures using side coupling...
Space-division multiplexed (SDM) systems use multiple spatial-paths in multimode or multi-core fiber to increase the capacity and/or photon-efficiency carried by an optical fiber. For SDM systems to be competitive, they must outperform or have a cost advantage over parallel single mode fiber systems. The cost advantages can come from spatial integration where many spatial channels can be processed...
In this work we analyse radio access networks (RAN) deployments from the capacity and cost points of view. We find that in order to support the new radio (NR) with system bandwidth of 800MHz and reduce the number of fibre connections between NR and baseband units (BBU) one can use dense wavelength division multiplexing (DWDM), pulse amplitude modulation (PAM4) or multicore fibre. We also find that...
The huge increase of datacom traffic requires laser sources of ever-widening modulation bandwidth. Vertical-Cavity Surface-Emitting Lasers (VCSEL) are strategically relevant given that their wide use for short communication links such as in datacenters and are, in light of recent developments, good candidates to address such demands. We propose to increase the modulation bandwidth by vertically integrating...
Software defined optical transmission (SDOT) and sliceable programmable transceivers, exploiting multiple dimensions and photonic technologies, enable to support future networks with advanced and novel functionalities, meeting the capacity and reach targets, according to the segment requirements. Programmability and modularity are crucial for scalability and functional disaggregation, facilitating...
Coupled photonic crystal microcavities have been considered when exploring platforms for quantum photonic effects like quantum-optical Josephson interferometers, single photon emitters and coupled-cavity single-photon emitters and many others. Arrays of photonic cavities are relevant structures for developing large-scale photonic integrated circuits, single mode coupled-cavity lasers and for investigating...
We report on a theoretical and experimental study performed on AlAs/GaAs micropillar cavities containing InGaAs quantum dots as active medium. The devices have the interesting property of having almost all emission (spontaneous and stimulated) channelled into one cavity mode. They are excellent experimental platforms for studying laser physics because their emission behaviours question our understanding...
We propose in this work an original nanobeam cavity geometry for the hybrid integration of active materials in silicon photonics. The key point of this structure is to use Bragg mirrors exploiting a dielectric dispersion band, to form a field-confining cavity core relying on an air dispersion band. The resulting situation opens the way for a gentle confinement of the electromagnetic field in the low-index...
Photonic crystal waveguides support chiral-point polarisation singularities which give rise to local chirality even in the absence of a global chiral symmetry. Placing a quantum dot at such a C-point gives rise to a uni-directional emission dependent on the electron spin - ideal for applications in quantum information as it entangles the spin direction of electrons on the quantum dot (static qubits)...
The talk will start with a historical review appreciating and emphasizing the importance and relevance of the Hanbury-Brown & Twiss (HBT) experiment for nowadays quantum optics. Then, we investigate within a modern and sophisticated version of the HBT experiment the quantum optical properties of optoelectronic quantum dot based superluminescent diodes (SLDs). The demonstrated full incoherence...
Kerr frequency comb generated in ultra-high Q whispering gallery mode (WGM) microresonators is a promising light source for ultra-compact photonic devices due to its potential advantages of low power consumption and possibility of chip integration. We introduce a technique to stabilize and control effective generation of dissipative Kerr solitons (DKS) in nonlinear crystalline microresonators using...
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