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Studies of limitations to lateral brightness in high power diode lasers using spectrally-resolved mode profiles
/forschung/publikationen/studies-of-limitations-to-lateral-brightness-in-high-power-diode-lasers-using-spectrally-resolved-mode-profiles
Efficient DFB broad-area lasers enable spectrally-resolved measurements of lateral field profiles to high powers, indicating brightness is limited by both increasing numbers of guided modes and…
Design optimisation of high-brightness laser diodes for external cavity operation in the BRIDLE project
/forschung/publikationen/design-optimisation-of-high-brightness-laser-diodes-for-external-cavity-operation-in-the-bridle-project
We report on the design aspects of high performance diode lasers for application in high-brightness spectral beam combining and coherent beam combining modules. Key performance trade-offs are…
Experimental Investigation of Limits to Slow Axis Beam Quality in High Power Broad Area Diode Lasers
/forschung/publikationen/experimental-investigation-of-limits-to-slow-axis-beam-quality-in-high-power-broad-area-diode-lasers
An experimental study of factors limiting lateral beam parameter product (BPP) in broad area lasers is presented. BPP is an approximately linear function of self-heating, whose dependence on design,…
Factors influencing brightness and beam quality of conventional and distributed Bragg reflector tapered laser diodes in absence of self-heating
/forschung/publikationen/factors-influencing-brightness-and-beam-quality-of-conventional-and-distributed-bragg-reflector-tapered-laser-diodes-in-absence-of-self-heating
In this study, the authors examine some of the factors affecting the brightness and the beam quality of high-power tapered lasers. The large volume resonators required to achieve high-power,…
Design of Waveguide Manifold Multiplexers with Dual-Mode Filters Using Distributed Models
/forschung/publikationen/design-of-waveguide-manifold-multiplexers-with-dual-mode-filters-using-distributed-models
A novel multiplexer design technique which makes use of distributed models is proposed. For the first time, dis- tributed models of dual mode filters are applied to the design of manifold…
Highly Efficient 200-GHz Fixed-Frequency Fundamental Source in Transferred-Substrate InP DHBT Technology
/forschung/publikationen/highly-efficient-200-ghz-fixed-frequency-fundamental-source-in-transferred-substrate-inp-dhbt-technology
A 197-GHz fixed-frequency fundamental oscillator with high efficiency is presented, realized using a transferred-substrate InP-DHBT process. It delivers 0 dBm output power, with a phase noise of -88…
Iterative Design of a Harmonically Tuned Multi-Octave Broadband Power Amplifier
/forschung/publikationen/iterative-design-of-a-harmonically-tuned-multi-octave-broadband-power-amplifier
This article presents the design approach, realization and measurement results of a highly efficient double octave wideband power amplifier using a GaN-HEMT bare-die. An iterative approach to obtain…
InP-Si BiCMOS Heterointegration Using a Substrate Transfer Process
/forschung/publikationen/inp-si-bicmos-heterointegration-using-a-substrate-transfer-process-1
Broadband transmitters for radio links in the millimeter band are key building blocks for future wireless communication systems. Such components can be realized by means of an InP-on-BiCMOS…
Reference Plane Transformation of Continuous Mode Terminations for Broadband Power Amplifiers
/forschung/publikationen/reference-plane-transformation-of-continuous-mode-terminations-for-broadband-power-amplifiers
In this article the behavior of continuous mode amplifiers at different reference planes is discussed using the example of a continuous class-F-1 amplifier mode. The variation of the output…
Potential of Coplanar X-band GaN-MMIC Power Amplifiers
/forschung/publikationen/potential-of-coplanar-x-band-gan-mmic-power-amplifiers
While the vast majority of GaN X-band PAs is realized as microstrip circuits, this paper reports design, fabrication and measurement of a coplanar version. The amplifier is processed using the FBH…