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Traveling Wave Model Based Simulation of Tunable Multi-Wavelength Diode Laser Systems
/forschung/publikationen/traveling-wave-model-based-simulation-of-tunable-multi-wavelength-diode-laser-systems
We show simulation results of a compact, integrated and tunable multi-wavelength diode laser emitting around 785 nm. The presented design was optimized using passive waveguide simulations and then…
Extra half-plane shortening of dislocations as an origin of tensile strain in Si-doped (Al)GaN
/forschung/publikationen/extra-half-plane-shortening-of-dislocations-as-an-origin-of-tensile-strain-in-si-doped-algan
Si doping of (Al,Ga)N layers grown by metalorganic chemical vapor deposition induces an inclination of threading dislocations (TDs). This inclination leads to a change of the extra half-plane size of…
Concept for Continuously Tunable Output Filters for Digital Transmitter Architectures
/forschung/publikationen/concept-for-continuously-tunable-output-filters-for-digital-transmitter-architectures
This paper presents a novel output filter approach for continuously frequency-tunable digital power amplifiers, suitable for future seamless and band-less applications in 5G, e.g. for cognitive…
High power broad-area lasers with buried implantation for current confinement
/forschung/publikationen/high-power-broad-area-lasers-with-buried-implantation-for-current-confinement
Broad area lasers emitting near 915 nm are fabricated using a 2-step epitaxial growth process, with an intermediate implantation of silicon or oxygen ions. This approach allows for the…
ZERODUR® based optical systems for quantum gas experiments in space
/forschung/publikationen/zerodurreg-based-optical-systems-for-quantum-gas-experiments-in-space
Numerous quantum technologies make use of a microgravity environment e.g. in space. Operating in this extreme environment makes high demands on the experiment and especially the laser system…
Design and modeling of an ultra-wideband low-noise distributed amplifier in InP DHBT technology
/forschung/publikationen/design-and-modeling-of-an-ultra-wideband-low-noise-distributed-amplifier-in-inp-dhbt-technology
This paper reports on an ultra-wideband low-noise distributed amplifier (LNDA) in a transferred-substrate InP double heterojunction bipolar transistor (DHBT) technology which exhibits a uniform…
Highly compact GaN-based all-digital transmitter chain including SPDT T/Rx switch for massive MIMO applications
/forschung/publikationen/highly-compact-gan-based-all-digital-transmitter-chain-including-spdt-trx-switch-for-massive-mimo-applications
This paper presents a fully digital transmitter chain from baseband to antenna, including a modulator, two truly digital (i.e. fully switched) microwave power amplifiers and a transmit/receive…
Influence of substrate off-cut angle on the performance of 310 nm light emitting diodes
/forschung/publikationen/influence-of-substrate-off-cut-angle-on-the-performance-of-310-nm-light-emitting-diodes
The influence of the sapphire substrate off-cut angle from c-plane orientation on the surface morphology of AlN/AlGaN layers and the performance of 310 nm light emitting diode structures has…
Broadband Semiconductor Light Sources Operating at 1060 nm Based on InAs:Sb/GaAs Submonolayer Quantum Dots
/forschung/publikationen/broadband-semiconductor-light-sources-operating-at-1060-nm-based-on-inassbgaas-submonolayer-quantum-dots
In this paper, we investigate the potential of submonolayer-grown InAs:Sb/GaAs quantum dots as active medium for opto-electronic devices emitting in the 1060 nm spectral range. Grown as multiple…
Time-Dependent Simulation of Thermal Lensing in High-Power Broad-Area Semiconductor Lasers
/forschung/publikationen/time-dependent-simulation-of-thermal-lensing-in-high-power-broad-area-semiconductor-lasers
We propose a physically realistic and yet numerically applicable thermal model to account for short- and long-term self-heating within broad-area lasers. Although the temperature increase is small…