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Setzpfandt F.,Friedrich - Schiller University of Jena | Falkner M.,Friedrich - Schiller University of Jena | Pertsch T.,Friedrich - Schiller University of Jena | Sohler W.,University of Paderborn | Schiek R.,Regensburg University of Applied Sciences
Applied Physics Letters | Year: 2013

We demonstrate a technique for measuring the linear bandstructure of periodic systems with quadratic nonlinearity. The phase-matching constraints of parametric optical frequency mixing are employed to probe the longitudinal wavevectors of the eigenmodes. The method is verified experimentally by measuring the diffraction relation of eigenmodes in periodically poled titanium-indiffused lithium niobate waveguide arrays with second-harmonic generation. © 2013 American Institute of Physics. Source


Reinhardt D.,BMW AG | Kucera M.,Regensburg University of Applied Sciences
PECCS 2013 - Proceedings of the 3rd International Conference on Pervasive Embedded Computing and Communication Systems | Year: 2013

Electric and electronic functionalities increase exponentially in every mobility domain. The automotive industry is confronted with a rising system complexity and several restricting requirements and standards (like AUTOSAR), in particular to design embedded software for electronic control units. To stand against rampant functionalities software units could be restructured according to their affiliation and should not be attached to a certain place. This can be effected by integration on single controllers. On the one hand the system wide amount of hardware controllers could such be limited. On the other hand the workload for integration CPUs will rise. To support this paradigm, multi-core systems can provide enough processing power in an efficient way. This paper shows a first approach to combine automotive functionality on such a single controller. Source


Setzpfandt F.,Friedrich - Schiller University of Jena | Setzpfandt F.,Australian National University | Sukhorukov A.A.,Australian National University | Neshev D.N.,Australian National University | And 4 more authors.
Physical Review Letters | Year: 2010

We study two-color parametric nonlinear modes in waveguide arrays with a quadratic nonlinear response. We predict theoretically and observe experimentally a new type of phase transition manifested in an abrupt power-controlled change of the mode structure from unstaggered to staggered, due to the interplay of localization and synchronization in parametrically driven discrete systems. © 2010 The American Physical Society. Source


Kohlert D.,Regensburg University of Applied Sciences | Schreier F.,German Aerospace Center
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing | Year: 2011

Radiative transfer modelling of high resolution infrared (or microwave) spectra still represents a major challenge for the processing of atmospheric remote sensing data despite significant advances in the numerical techniques utilized in line-by-line modelling by, e.g., optimized Voigt function algorithms or multigrid approaches. Special purpose computing hardware such as Field Programmable Gate Arrays (FPGAs) can be used to cope with the dramatic increase of data quality and quantity. Utilizing a highly optimized implementation of an uniform rational function approximation of the Voigt function, the molecular absorption cross section computation - representing the most compute intensive part of radiative transfer codes - has been realized on FPGA. Design and implementation of the FPGA coprocessor is presented along with first performance tests and an outlook for the ongoing further development. © 2011 IEEE. Source


Schiek R.,Regensburg University of Applied Sciences | Solntsev A.S.,Australian National University | Neshev D.N.,Australian National University
Applied Physics Letters | Year: 2012

We study the temporal dynamics of all-optical switching in nonlinear directional couplers in periodically poled lithium niobate. The characteristic features of such switching, including asymmetric pulse break-up and back-switching were measured in full agreement with the theoretical predictions. Based on the time-resolved measurement of intensity-dependent switching, finally the theoretically long-known continuous-wave switching curve has experimentally been confirmed. © 2012 American Institute of Physics. Source

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