A5085298754- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Terahertz technology and applications
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Thin-Film Transistor Technologies
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Semiconductor Quantum Structures and Devices
- Advanced Optical Network Technologies
- Spectroscopy and Laser Applications
- Analog and Mixed-Signal Circuit Design
- Thermography and Photoacoustic Techniques
- Silicon and Solar Cell Technologies
- Advancements in PLL and VCO Technologies
- Integrated Circuits and Semiconductor Failure Analysis
- Silicon Nanostructures and Photoluminescence
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Sensor Technology and Measurement Systems
- Semiconductor materials and devices
- Spectroscopy and Quantum Chemical Studies
- Advanced Multi-Objective Optimization Algorithms
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2006-2024
University of Lübeck
2024
Fraunhofer Institute for Photonic Microsystems
2012-2024
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology
2016-2023
Carl von Ossietzky Universität Oldenburg
2022
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2021
Anstalt für Verbrennungskraftmaschinen List
2018-2021
University of Konstanz
2011-2019
Universidad Nacional del Sur
2019
Centro Científico Tecnológico - Bahía Blanca
2019
Stable gigaohm seals were obtained between a microstructured silicon chip (1) and an electrophoretically autopositioned giant vesicle (2). The low electrical background noise (<80 fA) of the resulting planar lipid bilayer (3) allows observation single ion channel events.
We experimentally demonstrate multiple-input-multiple-output transmission of a combined 3-space-, and 2-polarization-, 5-wavelength-division multiplex in 3-core microstructured fiber over 4200 km. This is the record distance for spatial-division multiplexing fiber.
Four-wave mixing (FWM) in semiconductor optical amplifiers (SOAs) is an important tool for frequency conversion and fast switching all-optical communication networks. We review the main applications of SOAs as nonlinear components. Concentrating on FWM, we define general parameters that are relevance signal processing applications. show, how basic experiments simulation procedures can be used to determine optimum operating conditions intended Besides a comprehensive investigation FWM among...
Abstract Nafion 117 membranes were impregnated with various imidazolium (1‐hexyl‐3‐methyl‐imidazolium/HMI, 1‐butyl‐3‐methyl‐imidazolium/BMI) and pyrrolidinium (1‐butyl‐1‐methyl‐pyrrolidinium/BMPyr) based ionic liquids bearing hydrophobic (tris(pentafluoroethyl)trifluorophosphate/FAP, bis(trifluoromethylsulfonyl)imide/BTSI, hexafluorophosphate/PF 6 ) more hydrophilic (tetrafluoroborate/BF 4 anions. The modified characterized in terms of uptake behavior, washing out the by water, swelling...
Low differential group delay (DGD) between the modes of a graded-index few-mode fiber is obtained by combining segments with DGD opposite sign. Transmission mode-multiplexed 6×20-GBd QPSK over record distance 1200 km demonstrated.
Intense multiterahertz pulses are used to study the coherent nonlinear response of bulk InSb by means field-resolved four-wave mixing spectroscopy. At amplitudes above 5 MV/cm signals show a clear temporal substructure which is unexpected in perturbative optics. Simulations based on model two-level quantum system demonstrate that spite strongly off-resonant character excitation high-field few-cycle drive interband resonances into nonperturbative regime Rabi flopping. The rotating wave...
Impulsive interband excitation with femtosecond near-infrared pulses establishes a plasma response in intrinsic germanium structures fabricated on silicon substrate. This direct approach activates the plasmonic resonance of Ge and enables their use as optical antennas up to mid-infrared spectral range. The switching lasts for hundreds picoseconds until charge recombination redshifts frequency. full behavior is modeled by electrodynamic established an electron-hole regular array antennas.
Slow anion channels in the plasma membrane of guard cells have been suggested to constitute an important control mechanism for long-term ion efflux, which produces stomatal closing. Identification pharmacological blockers these slow is instrumental understanding plant channel function and structure. Patch clamp studies were performed on cell protoplasts identify specific extracellular inhibitors channels. Extracellular application NPPB IAA-94 produced a strong inhibition physiological...
Closing of stomatal pores in the leaf epidermis higher plants is mediated by long-term release potassium and anions chloride malate from guard cells parallel metabolism malate. Previous studies have shown that slowly activating anion channels plasma membrane can provide a major pathway for efflux while also controlling K+ during closing: Anion produces depolarization cell drives required closing. The patch-clamp technique was applied to Vicia faba determine permeability physiologically...
We directly trace the near- and mid-infrared transmission change of a VO$_2$ thin film during an ultrafast insulator-to-metal transition triggered by high-field multi-terahertz transients. Non-thermal switching into metastable metallic state is governed solely amplitude applied terahertz field. In contrast to resonant excitation below threshold fluence, no signatures excitonic self-trapping are observed. Our findings consistent with generation spatially separated charge pairs cooperative...
We present a concept for networked optical wireless communications, also denoted as LiFi, to meet the requirements of industrial applications. These are primarily mobility support with moderate data rates per device, reliable real-time communication, and integrated positioning. describe distributed multiuser multiple-input multiple-output architecture, serving mobile devices via an infrastructure. The system consists central unit, being connected number frontends covering larger area. Our...
The phase dynamics that occur in bulk InGaAsP-InP semiconductor optical amplifiers (SOAs) response to picosecond pulse excitations at 10 and 40 GHz are studied experimentally numerically for various amplifier lengths. time dependencies of the changes absolute gain measured simultaneously. total shifts induced by 1.5-ps pulses higher than π SOAs with active region lengths between 0.5 2 mm exceed 2π a 1.5-mm-long amplifier. Phase above 1.5- 2-mm-long SOAs. dependence shift on bias current...
We have investigated three interferometric all-optical switches based on cross-phase modulation (XPM) in semiconductor optical amplifiers (SOAs), the laser amplifier a loop mirror (SLALOM) switch, Mach-Zehnder interferometer (MZI) and ultrafast nonlinear (UNI) switch. Switching windows with different widths are measured under similar conditions for all switching configurations. introduce integrated contrast ratio (ICR) as measure to evaluate performance of switch from windows. Using ICR,...
We present a novel low-loss 3-spot mode coupler to selectively address 6 spatial and polarization modes of few-mode fiber. The is used in 6×6 MIMO-transmission experiment over 154-km hybrid span consisting 129-km depressed-cladding 25-km graded-index
We experimentally demonstrate multiple-input-multiple-output transmission of a combined 3-space-, and 2-polarization-, 5-wavelength-division multiplex in 3-core microstructured fiber over 4200 km. This is the record distance for spatial-division multiplexing fiber.
Future generations of optical networks will require interfaces that operate beyond 1 Tb/s to keep up with the exploding worldwide Internet data capacity. The converters, digital- to-analog converter (DAC) and analog-to-digital (ADC), significantly define signal bandwidth can be transmitted or received an electro-optic transceiver. foreseen improvements complementary metal oxide semiconductor (CMOS) converters in upcoming CMOS technology nodes do not scale expected interface rates for future...
Clock recovery from a 160 Gbit/s data signal is demonstrated using bidirectionally operated electroabsorption modulator (EAM) as phase comparator. Employing differential detection scheme, excellent locking stability achieved. The recovered clock allows error-free transmission.
A novel all-optical differential phase-shift keying wavelength converter based on semiconductor optical amplifier nonlinearities is demonstrated in the 25- to 40-Gb/s range with pseudorandom binary sequence of 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</sup> -1, and its regenerative properties as well cascadability are discussed
We have developed a rapid scanning terahertz (THz) spectrometer based on synchronized two-fiber-laser system. When the system is set to asynchronous optical sampling mode, THz spectra extending 3 can be acquired within 1 μs at signal-to-noise ratio of electric field better than 20. Signal averaging results in dynamic range more 60 dB, and frequency components 4 detected. lasers are same repetition rate, electronically controlled rate 2.5 kHz demonstrated, making versatile for different...