Terahertz Communication Demonstration by using a High-Tc Superconducting Josephson Receiver Integrated with a Miniature Cryocooler

This paper presents the terahertz communication demonstration by using a quasi-optically coupled high-
$T_{\mathrm{c}}$
superconducting (HTS) Josephson receiver. The receiver consists of a broadband HTS Josephson-junction mixer integrated with a cryogenic low noise amplifier inside a miniature cryocooler. The noise and conversion properties of the broadband HTS mixer versus the bias current and local oscillator (LO) power, are thoroughly investigated for different operating temperatures and frequencies. Based on such HTS receiver frontend, a 320-GHz wireless communication link was established at the UTS laboratory and demonstrated by using the QPSK and 16QAM modulations, respectively.