This paper describes a systematic method and an experimental software system for high-level transformations of designs specified at behavioral level. The goal is to transform the initial design specifications into an optimized data flow graph (DFG) better suited for high-level synthesis. The optimizing transformations are based on a canonical Taylor Expansion Diagram (TED) representation, follo...

A mid-IR multiwavelength difference frequency generation (DFG) laser source with fiber laser fundamental lights is demonstrated by using the dispersion property of PPLN to broaden the quasi-phase-matching (QPM) acceptance bandwidth (BW). Our results show that the QPM BW for the pump YDFL is much larger than that for the signal EDFL. Using a multiwavelength YDFL and a single-wavelength EDFL as t...

Zusammenfassung Dieser Bericht beschreibt die Zielsetzung und aktuelle Ergebnisse des DFG-Sonderforschungsbereichs 501 „Entwicklung großer Systeme mit generischen Methoden“. Dem SFB liegt ein experimenteller Ansatz zugrunde, bei dem die Einzelergebnisse der Teilprojekte in gemeinsamen kontrollierten Experimenten und prototypischen Anwendungsentwicklungen empirisch untersucht werden. Summary Thi...

Starting with the representation of the Wilson average in the Euclidean 4D compact QED as a partition function of the Universal Confining String Theory (UCST), we derive for it the corresponding loop equation, alternative to the familiar one. In the functional momentum representation the obtained equation decouples into two independent ones, which describe the dynamics of the transverse and lon...

Zusammenfassung Entwurf, Verifikation und Test zuverlässiger nanoelektronischer Systeme erfordern grundlegend neue Methoden und Ansätze. Ein robuster Entwurf wird unabdingbar, um Fertigungsfehler, Parameterschwankungen, zeitabhängige Materialveränderungen und vorübergehende Störungen in gewissem Umfang zu tolerieren. Gleichzeitig verlieren gerade dadurch viele traditionelle Testverfahren ihre A...

Phase matching in a multilayer AlGaAs waveguide is used to generate mid-IR (7.5-8.5 μm) light through difference frequency generation (DFG) between a 1550 nm pump and 1950 nm signal. This represents the longest wavelength generated through DFG in a 2D waveguide mode in a semiconductor waveguide. It was produced with an efficiency of 1.2×10(-4) %/W in a 1 mm long sample. The process is shown to ...