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In this paper, we report on time resolved electro-optic measurements in strained silicon resonators. Strain is induced by applying a mechanical deformation to the device. It is demonstrated that the linear electro-optic effect vanishes when the applied voltage modulation varies much faster than the free carrier lifetime, and that this occurs independently on the level of the applied stress. This demonstrates...
Third-order nonlinear optical phenomena have been intensively studied in integrated structures of crystalline silicon, Hydex, and silicon nitride for different applications, from classical to quantum photonics. As any other material, also porous silicon PSi is characterized by a third-order nonlinear response. Previous works have focused mainly on third-harmonic generation or two-photon absorption...
We demonstrate the fabrication of a z-cut lithium niobate (LiNbO3) whispering-gallery-mode (WGM) resonator, by polishing the rim of a commercially available LiNbO3 disk. The disk is in diameter of 12 mm and thickness of 1 mm. We carry out an experiment to measure the quality factor (Q factor) of the resonator. Moreover, a simplified theoretical model is discussed in order to investigate in detail...
Progress on the development of a long wavelength (∼2 µm) generic monolithic photonic integration technology on indium phosphide substrate and a novel concept of a tunable laser realized as a photonic integrated circuit using such technology are presented. Insights into the development of active and passive waveguide structures which are used to define a limited set of on-chip functionalities in the...
The expected explosion of services offered in the cloud has revealed new paradigms in telecommunication networks and motivated research to satisfy the needs arising. Interconnection between facilities hosting computing resources or between computing resources and end-users may require service-specific Service Level Agreement (SLA) parameters. In this paper, we study the minimum connectivity requirements...
In this paper, we present the numerical conception of a surface plasmon-based nanotweezers obtained by coupling a short nanoparticle chain to a traditional SOI waveguide. In particular, we detail on simplified calculation scheme, based on the estimation of the gradient force, able to ease the analysis when the refractive index of the tweezed particles is similar to that of the background. Results...
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.
A hierarchical cache architecture for the telecom cloud is investigated. Intermediate cache (IC) nodes, placed in geographically distributed datacenters, are interconnected through permanent “per content provider” (CP) virtual network topologies (CP-VNT), whilst leaf cache (LC) nodes are placed close to users. CP's video contents are replicated in the IC nodes through the CP-VNTs, whilst LC-to-IC...
The specific, time-resolved, and parallel detection of different proteins with a handheld system is demonstrated. Locally-functionalized photonic crystal surfaces are employed as the transducer for an intensity-based, spectrometer-free measurement. The biosensor is fabricated by first forming the grating structure with ultraviolet nanoimprint lithography, depositing an 80-nm thick titanium dioxide...
In this paper, we report our recent results about slotted photonic structures for hybrid on-chip integration in silicon photonics. Explored schemes cover hollow core waveguide optimized micro-ring resonators, slot photonic crystal cavities, and slow light slotted waveguides, all aiming at the enhancement of light-matter interactions. A comparison between several of these approaches is drawn regarding...
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...
Molecularly imprinted polymers are efficient materials to detect selectively target molecules with a very high sensitivity. In this study, we associate them to 3D self-assembled photonic crystals and extend their use to the detection of nanoparticles. We focus on the realization of the imprint of nanoparticles, in our case fluorescent nanocrystals, and demonstrate the efficiency of the imprinting...
We propose and numerically verify a scheme of frequency-shift free mid-span spectral inversion for nonlinearity mitigation in standard single mode fiber. Spectral inversion is accomplished by optical phase conjugation, realized by counter-propagating dual pumped four-wave mixing in highly nonlinear fiber. The two pump frequencies are placed symmetrically around signal frequency to ensure that conjugate...
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...
In this paper, we present the absorption edge of (InAs)6ML/(GaSb)n superlattices, which has been determined with the use of the 8-band k·p method. The aim of the work was to develop a numerical tool, which gives the possibility to design InAs/GaSb superlattices for infrared detector structures. Most of works, which were published in this field till now, present the results of electronic states calculations...
There are several factors that can contribute to increase of the total information capacity of free space optical (FSO) channels and they include parallelism in design of system architecture with a multitude of independent modes (both in spectra and spatial domains), selection of modulation, detection, and coding strategies, as well as employment of compensation schemes that can offset the impact...
In ultra-high-speed (>400Gb/s per wavelength), high-spectral efficiency coherent optical communication systems using multi-carrier spectral superchannels, the maximum reach is severely limited due to linear and, foremost, nonlinear impairments. Hence, the implementation of advanced digital signal processing (DSP) techniques in optical transceivers is crucial for alleviating the impact of such impairments...
In state-of-the-art fibre-optics communication systems, the forward error correction (FEC) and high-order constellation formats are employed. It is important to approach the Shannon limit by using turbo product codes (TPC) and low-density parity-check (LDPC) codes with soft-decision decoding (SDD) algorithms. In this paper, we first study the rate-adaptive irregular LDPC coding technique in wide range...
In this paper, a novel multidimensional optical OFDM system is investigated for programmable transceivers, saving DSP resources and facilitating scalability at the increase of the number of dimensions. Numerical evaluations show successful 100 Gb/s transmission for different link configurations.
Our aim in this work is to characterize experimentally the transmission properties of a 19-core plastic optical fiber and to compare them to those obtained for several single-core POFs under the same conditions. Thus, we measured frequency response, attenuation and angular output power distribution as functions of fiber length under different configurations. Additionally, measurements of parameters...
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