University of Paderborn

About: University of Paderborn is a education organization based out in Paderborn, Nordrhein-Westfalen, Germany. It is known for research contribution in the topics: Control reconfiguration & Software. The organization has 6684 authors who have published 16929 publications receiving 323154 citations.

Tool integration at the meta-model level: the Fujaba approach

Abstract: Today’s development processes employ a variety of notations and tools, e.g., the Unified Modeling Language UML, the Standard Description Language SDL, requirements databases, design tools, code generators, model checkers, etc. For better process support, the employed tools may be organized within a tool suite or integration platform, e.g., Rational Rose or Eclipse. While these tool-integration platforms usually provide GUI adaption mechanisms and functional adaption via application programming interfaces, they frequently do not provide appropriate means for data integration at the meta-model level. Thus, overlapping and redundant data from different “integrated” tools may easily become inconsistent and unusable. We propose two design patterns that provide a flexible basis for the integration of different tool data at the meta-model level. To achieve consistency between meta-models, we describe rule-based mechanisms providing generic solutions for managing overlapping and redundant data. The proposed mechanisms are widely used within the Fujaba Tool Suite. We report about our implementation and application experiences .

Distributed feedback-distributed Bragg reflector coupled cavity laser with a Ti:(Fe:)Er:LiNbO3 waveguide.

Abstract: A thermally fixed photorefractive Bragg grating is written in a single-mode Ti:Fe:Er:LiNbO3 channel waveguide and used to develop a distributed feedback–distributed Bragg reflector coupled cavity laser with a second broadband dielectric cavity mirror. The optically pumped λp=1480 nm,P=130 mW laser emits in single-frequency operation as much as 8 mW at λ=1557.2 nm with a slope efficiency of ∼22%. The laser wavelength can be thermo-optically and electro-optically tuned over 100 pm.

Giant Nonlinear Optical Activity of Achiral Origin in Planar Metasurfaces with Quadratic and Cubic Nonlinearities

Abstract: 3D chirality is shown to be unnecessary for introducing strong circular dichroism for harmonic generations. Specifically, near-unity circular dichroism for both second-harmonic generation and third-harmonic generations is demonstrated on suitably designed ultrathin plasmonic metasurfaces with only 2D planar chirality. The study opens up new routes for designing chip-type biosensing platform, which may allow for highly sensitive detection of bio- and chemical molecules with weak chirality.