The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present our latest research results about ultralow power integrated nanophotonic devices based on photonic crystals and some more nanophotonics. We will also discuss the possibility to employ these integrated nanophotonics for putting optical computing technologies into a processor chip.
The exponential traffic growth driven by high bandwidth applications such as video on demand and video gaming, is continuously forcing network operators to implement new schemes to increase the capacity offered to the end user. In particular, passive optical networks with a full-duplex capacity with 10 Gbps over 40-km spans are expected to be developed shortly. However, the range of such systems is...
In this paper, we propose a novel method to experimentally determine the linear absorption coefficient (LAC) of graphene-silicon hybrid waveguides (GSHWs) by a symmetrical add-drop silicon microring resonator. Experimental results show that the LAC of a GSHW has an average value of 0.23 dB/µm. Our approach does not depend on the fiber coupling, waveguide end facets etc. and thus, is promising for...
Recent advances in the theoretical and experimental studies of Ge/SiGe quantum wells structures will be presented with a focus on optical telecommunication applications. Firstly, high-speed stand-alone Ge/SiGe QW electro-absorption modulators and photodetectors will be reported. It will be followed by the presentation of different methods for engineering Ge/SiGe QW to tune the operating wavelength...
Near-field coupling to nanophotonic waveguides enables absorption engineering of superconducting nanowires for efficient single photon detection on chip. The direct compatibility with photonic circuitry allows for using such devices in the framework of integrated optics and thus for exploiting the rich toolbox of nanophotonics for device characterization and optimization. We integrate superconducting...
Research infrastructures are the backbone of modern scientific and technological systems and are therefore instrumental in increasing the competitiveness. We present an open research infrastructure, ORCIP, created for the scientific community and industry to test, measure and certificate advanced optical & radio systems.
We develop the asymptotic theory of third-harmonic generation from silicon nanoparticles driven by optically-induced Mie resonances and analyze the multipolar nature of the generated electromagnetic fields. We propose the approaches for directing the resonantly enhanced nonlinear scattering by spherical and disk-shaped particles, excited in the vicinity of the magnetic dipolar resonance. Our analytical...
Nonlinear optical properties of tris-(8-hydroxyquinoline)-aluminum (Alq3) solution were investigated by standard backward degenerate four wave mixing (DFWM) method at 532 nm. Tetrahydrofuran (THF) was used to dissolve Alq3 powder, which was purchased from Sigma Aldrich Co. It was found that the studied material exhibit large value of third order nonlinear optical susceptibility.
Generic photonic integration technology platforms allow for design and fabrication of large complexity application specific photonic integrated circuits. Monolithic active-passive integration on indium phosphide substrate naturally enables a reliable co-integration of optical gain elements and therefore on-chip realization of advanced laser systems. An overview of multi-wavelength sources in the form...
This work contains investigation results of the structural and optical properties for solutions as well as thin films containing single-walled carbon nanotubes. To investigate the optical properties 0.25, 0.5 and 1 mg of Single-Walled Carbon Nanotubes were dispersed in low concentration aqueous SDS solution. The same solutions were used to fabricate thin films. The films were successfully grown by...
Large-scale data centers store a huge amount of the world's data in their cloud servers. To ensure fast, reliable, low power, and low cost transmission, the communication channel between the server units is optical, at the highest available data rates of 100 – 400 Gbps. Consequently, all future solutions should rely on advanced communication techniques combined with high order modulation and digital...
We experimentally demonstrate topologically protected optical waveguiding in silicon at the interface between two topologically distinct dimer chains. Further, we propose and demonstrate beating between topological and trivial defect modes.
Array waveguide gratings (AWGs) are a key component in WDM systems, allowing for de-multiplexing and routing of wavelength channels. A high-resolution AWG able to satisfy challenging requirements in terms of insertion loss and X-talk is what is needed to contribute to the paradigm change in the deployment of optical communication that is nowadays occurring within the ROADM architectures. In order...
Application of various types of diffractive optical elements (DOE) for the generation of cylindrical vector beams on the basis of uniaxial crystals is analyzed. DOEs operating in the first order of diffraction make it possible to generate structured laser beams with inhomogeneous polarization but their energetic efficiency is low. A spiral phase plate is characterized by high efficiency but it does...
This paper presents a comprehensive numerical study on the surface relief technique implemented in nitride Vertical-Cavity Surface-Emitting Laser (VCSEL) emitting in the 414-nm range. We calculated the threshold currents and optical modes in VCSEL structures with and without a surface relief. A standard structure was based on the first continuous-wave nitride VCSEL reported to operate at room temperature...
In this paper we present a multi-flow transmitter developed within the EU project PANTHER and we evaluate its first proof-of-concept demonstration of up to two single- or dual-polarization optical flows with selectable wavelength, m-QAM modulation format, number of carriers and destination. Multiflow operation is realized by two polymer boards allowing optical carrier management and optional polarization...
The next generation of optical networks requires the development of optical technology that supports high bandwidth, such as the coherent systems. The coherent detection allows the in-phase and quadrature components of a QPSK signal to be extracted as a result of the interference with a local oscillator. An integrated optics flexible 90° hybrid coupler device based on a single organic-inorganic di-ureasil...
We have shown that at the interface between the metal and smectic A liquid crystal (SALC) the Rayleigh stimulated scattering of surface plasmon polaritons (SPPs) occurs.
In this communication, we present strategies to implement novel or enhanced optoelectronic functionalities on silicon via the monolithic integration of functional oxides as active layers for nanophotonic devices. We focus on the use of ferroelectric oxides with naturally strong electro-optical coefficients such as BaTiO3 (BTO) on SOI for the realization of electro-optical modulators around 1.55 µm...
Probabilistic shaping and intrachannel nonlinear compensation are advanced techniques with good potential to increase the reach of future optical transmission systems. While nonlinear compensation has attracted considerable attention from the research community, especially the digital backpropagation algorithm, probabilistic shaping for optical communications remains only partially explored. Both...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.