Publications
Demonstration of a 630-GHz photomixer used as a local oscillator
June 13, 1999
Conference Paper
Published in:
1999 IEEE MTT-S Int. Microwave Symp. Digest, Vol. 1, 13-19 June 1999, pp. 127-130.
Topic:
Summary
We report the first successful demonstration of a photomixer local oscillator (LO) integrated with a superconducting heterodyne detector. The photomixer LO generated the difference frequency of two diode lasers by optical heterodyne conversion in low-temperature-grown GaAs. The measured receiver noise temperature, 331 K at 630 GHz, compares favorably with that achieved using a varactor-multiplier LO. We also report the design of a high-power distributed photomixer structure.
Summary
We report the first successful demonstration of a photomixer local oscillator (LO) integrated with a superconducting heterodyne detector. The photomixer LO generated the difference frequency of two diode lasers by optical heterodyne conversion in low-temperature-grown GaAs. The measured receiver noise temperature, 331 K at 630 GHz, compares favorably with that...
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A photomixer local oscillator for a 630-GHz heterodyne receiver
June 1, 1999
Journal Article
Published in:
IEEE Microw. Guid. Wave Lett., Vol. 9, No. 6, June 1999, pp. 245-7.
Topic:
R&D group:
Summary
A photomixer local oscillator (LO) operating at the 630-GHz difference frequency of two laser diodes was successfully demonstrated with a heterodyne detector based on a niobium superconducting tunnel junction. The low-temperature-grown GaAs photomixer generated 0.20 uW in the input spatial mode of the receiver. Using the photmixer LO, the double-sideband noise temperature of the receiver was 331 K - in good agreement with the 323-K noise temperature obtained when a multiplied Gunn oscillator generating 0.25 uW was substituted for the photomixer.
Summary
A photomixer local oscillator (LO) operating at the 630-GHz difference frequency of two laser diodes was successfully demonstrated with a heterodyne detector based on a niobium superconducting tunnel junction. The low-temperature-grown GaAs photomixer generated 0.20 uW in the input spatial mode of the receiver. Using the photmixer LO, the double-sideband...
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