Josephson junction FSK demodulator

Details Josephson junction FSK demodulator Josephson junction FSK demodulator

1990-10-30

1991-08-13

Grimm, Siegfried H.

Demodulators

Frequency shift keying or minimum shift keying demodulator

Input signal combined with local oscillator or carrier...

329322, 329323, 375 80, 375 88, 359189, 359325, H04L 2714

Patent

active

050399519

ABSTRACT:
A Josephson junction (100) is employed as a very-high-speed frequency demodulator for detecting a frequency-shift-keyed (FSK) modulated signal (201) in a microwave or lightwave communication system. The voltage induced across the junction in response to an incident FSK modulated radiation signal follows the frequency variations in the incident wave thereby directly demodulating the information signal from its carrier. In the disclosed embodiment an FSK modulated optical signal is mixed with a local oscillator (303) signal, which is then incident on a photodetector (305). The resultant microwave-frequency signal is then applied over a two-wire transmission line (308) to the Josephson junction (307) for direct demodulation.

REFERENCES:
patent: 3671848 (1972-06-01), Shapiro et al.
patent: 4429280 (1984-01-01), Gelinas

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