ALMA MEMO #449

Noise Evaluation of Hybrid Photonic Local Oscillator at 500 GHz

Y. Sekimoto, A. Ueda, T. Okuda (NAOJ), E. Bryerton (NRAO),
M. Sugimoto, H.Matsuo, S. Yokogawa, T. Noguchi, M. Ishiguro (NAOJ),
H. Ito, T. Nagatsuma, A. Hirata (NTT), and J. Payne (NRAO)

2003/03/20

A hybrid photonic local oscillator, which consists of a multiplier, a W-band power amplifier, a W-band photomixer, and a laser system, has been demonstrated to be sufficiently powerful to pump a superconducting-insulator-superconducting tunneling junction (SIS) mixer at 490 GHz.
The noise temperature at 490 GHz was 135 K, which is comparable with that pumped by Gunn oscillator + multipliers. Wideband spectrum of the multiplier is also measured.

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