Search results for "Photonics"
showing 10 items of 802 documents
Limits of ultra-high bit rate RZ data transmissions in terrestrial optical fiber systems
2006
We numerically study the limits of the terrestrial optical fiber systems as a function of the bit rate. In particular, we compare for 160-, 320- and 640-Gbit/s the limits of single channel and WDM configurations.
Supercontinuum to solitons: New nonlinear structures in fiber propagation
2010
We review our recent work in the field of optical rogue wave physics and applications. Beginning from a brief survey of the well-known noise and incoherence processes in optical fiber supercontinuum generation, we trace the links to recent developments in studying the emergence of high contrast localised breather structures in both spontaneous and induced nonlinear instabilities. In the latter case, we discuss our recent measurements that have reported the experimental observation of the Peregrine soliton, a unique class of rational soliton predicted to exist over 25 years ago and never previously observed.
40 GHz pulse source based on cross-phase modulation-induced focusing in normally dispersive optical fibers.
2016
We theoretically and experimentally investigate the design of a high-repetition rate source delivering well-separated optical pulses due to the nonlinear compression of a dual-frequency beat signal within a cavity-less normally dispersive fiber-based setup. This system is well described by a set of two coupled nonlinear Schrodinger equations for which the traditional normally dispersive defocusing regime is turned in a focusing temporal lens through a degenerated cross-phase modulation process (XPM). More precisely, the temporal compression of the initial beating is performed by the combined effects of normal dispersion and XPM-induced nonlinear phase shift provided by an intense beat signa…
Photonic microwave tunable single-bandpass filter based on a Mach-Zehnder interferometer
2006
The authors present the theoretical analysis and experimental demonstration of a novel single-bandpass tunable microwave filter. The filter is based on a broadband optical source and a fiber Mach-Zehnder interferometer and shows a high Q factor over a tuning range of 5-17 GHz. A generalized analysis considering that the optical signal propagates along optical delay lines with a dispersion slope different from zero is presented.
Squeezed Light Generation via Spatial Symmetry Breaking
2009
The spontaneous spatial symmetry breaking occurring in the transverse section of the light beam emitted by a degenerate optical parametric oscillator is shown to give rise to perfectly squeezed light. Such phenomenon occurs at any operating conditions, unlike conventional squeezing.
Directly proving the bosonic nature of photons
2021
A simple yet effective optical set-up, employing two controllable, indistinguishable photons, is proven to allow a direct measurement of the exchange phase due to the bosonic particle statistics.
A tracking fiber detector based on silicon photomultipliers for the KAOS spectrometer
2011
A tracking detector based on two meters long scintillating fibers read out by silicon photomultipliers (SiPM) is being developed for the Kaos spectrometer at the Mainz Microtron MAMI. Results from a prototype setup using 2 mm square fibers and large area SiPM readout are presented. The detection efficiency of such a combination was measured to be between 83 and 100% depending on the threshold on the SiPM amplitude. A Monte Carlo simulation based on a physical model was employed in order to extract the photon detection efficiency of the SiPM devices.
Effect of quantum efficiency on the performance of multijunction tandem cells
2015
New insight into the potential of practical solar cells can be given through alternative modeling approaches like Monte Carlo simulations. In the present work, the performance of three stacks of cells connected in series was examined at different levels of internal quantum efficiency. Incident photons, generated by employing the ASTM G173-03 and E490-00a data sets, are accounted for individually as they interact with the stack of cells. The values of the different bandgaps were chosen from a paper by K. Tanabe (2009), and the performance was studied based on photon dynamics.
Evaluation of a Commercial PhotoDiode Array for Radiation Detectors Readout
2011
The aim of the present work is the characterization of the new S8866-128-02 PhotoDiode (PD) array from Hamamatsu Photonics. This work includes the implementation of a readout system as well as electronic noise estimation in PDs under several conditions varying integration times and clock frequencies.
Phase Locking between Two All-Optical Quantum Memories.
2020
Optical approaches to quantum computation require the creation of multi-mode photonic quantum states in a controlled fashion. Here we experimentally demonstrate phase locking of two all-optical quantum memories, based on a concatenated cavity system with phase reference beams, for the time-controlled release of two-mode entangled single-photon states. The release time for each mode can be independently determined. The generated states are characterized by two-mode optical homodyne tomography. Entanglement and nonclassicality are preserved for release-time differences up to 400 ns, confirmed by logarithmic negativities and Wigner-function negativities, respectively.