Superconducting Phase Reference

We propose to develop the technology to address the need for better harmonic reference devices in order to support the field of non-linear device characterization. Superconducting delay lines can be used to generate nonlinear harmonic signals with a known magnitude and phase relationship to the fundamental signal. In order to make such a reference device, we will need to make superconducting delay lines of at least 20 cm length on a standard 5 cm wafer. This will require careful simulation and fabrication of a spiral meander line. Then we will package the delay line using interconnects to room temperature that have been optimized for stable phase response on thermal cycling. Finally, we will deliver the delay line packaged on a cryocooler with integrated PID to ensure stable temperature operation. Successful completion of this effort will form a solid foundation for building and testing an optimized laboratory prototype in Phase II. COMMERCIAL APPLICATIONS: Successful implementation of this technology will be useful as a reference device for comparing and/or calibrating a variety of different nonlinear measurement systems. Such a device could be used by wireless equipment companies to test and optimize their products with respect to reducing nonlinear device effects. This capability would allow HTS filter companies to optimize their products, which improve the call quality in the cellular and PCS markets.