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In this paper, continuous tuning of four-wave mixing bands in an ethanol-filled photonic crystal fiber is investigated. A wide tuning range of the parametric bands, from 745 nm to 920 nm (signal) and from 1260 nm to 1710 nm (idler), is achieved through the thermo-optic effect. This corresponds to a frequency tuning range higher than 2000 cm−1; such wide range can be particularly useful in applications...
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...
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...
We numerically optimise the span length that gives the lowest signal power asymmetry between transmitted and conjugated channels in a DWDM transmission with fibre based mid-link optical phase conjugation.
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...
We present a novel single-shot cross-correlation scheme based on the measurement of the transverse second harmonic generation (TSHG) in crystals with randomly distributed nonlinear ferroelectric domains. We implement it to the measurement of the temporal shape of ultrashort laser pulses with unknown temporal profile. This technique combines the capability of typical intensity cross-correlation methods...
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...
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...
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.
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...
Optical performance monitoring (OPM) is desired for future smart optical networks. 2-D phase portrait contains fruitful waveform information, which can be a valuable tool for OPM. In this paper, we review the generation of 2-D phase portrait by our cost-effective single-channel sampling technique, and its applications for OSNR and dispersion monitoring in different systems.
Numerical simulations with all-optical signal processing, e.g. switching by nonlinear fiber Bragg gratings (FBGs) via the optimization of pulse and grating parameters are presented. Using numerical solutions of nonlinear coupled mode equations temporal and spectral pulse profile distortions caused by the modulation instability are investigated and reviewed. The possibilities of elimination of the...
In this paper, we present the optical properties such as absorption, luminescence and IR transmission spectra of 2-styrylquinoline containing polymers thin films. We notice that the extension of the polymer chain in these compounds causes the change their spectroscopic and physical properties.
WDM optical systems and nonlinear effects are experiencing last years a huge investigation for performance evaluation. In this paper, and for high speed phase modulated WDM Nyquist systems, a novel method of PMD and first-order PMD (DGD) monitoring using cross phase modulation effect is presented. This technique demonstrate that in the presence of XPM effect, the states of polarization changes and...
We present theoretical studies of optical frequency comb generation in dispersive quadratically nonlinear resonators. We introduce a mean field equation approach to model cavity enhanced second harmonic generation and find excellent agreement with recent experimental frequency comb observations. We also develop a more general approach based on a single envelope equation for both quadratic and Kerr...
In this paper, we report recent results on the efficient generation of SWIR sources exploiting broadband wavelength conversion in silica fibers. Optimized cavity-less designs of fiber parametric amplifiers (FOPA) associated with Thulium amplification capable of high CW powers, wide tunability and modulation will be presented. We also present how parametric conversion can be extended deeper in the...
Present approaches for reducing the detrimental impact of parasitic phenomena, such as stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS), on the performance of fiber lasers and communication networks have focused on fiber design (e.g., microstructured fibers). While much has been learned in the development of the large mode area (LMA) designs, these fibers are highly complex...
We report our recent advances in the implementation of very high-speed optical channels (targeting 400 Gbps and 1 Tbit) based on multi-carrier super-channels supported by intense digital signal processing. We present results on modulation format agnostic polarization demultiplexing, computationally efficient chromatic dispersion equalization, and digital compensation of nonlinear impairments.
We report on a novel and efficient strategy that can drive a mechanical mode into the lasing regime by exploiting the radiation pressure force in optomechanical (OM) cavities. The pumping mechanism is based on a self-pulsing limit-cycle, which is a spontaneous process that modulates the intracavity radiation pressure force in resonance with a mechanical eigenmode of the OM cavity.
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