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Proceedings Paper

Heterodyne Noise Measurements Of A Microstrip, Waveguide Local Oscillator Modulator
Author(s): Steven A. Davidson; Richard S. Eng; Jenifer L. Bunis; Elaine R. Parshall
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Paper Abstract

Sidebands imposed on the output of a stable CO2 laser have been heterodyne mixed (on a 77K HgCdTe detector) with blackbody emission and alternately with radiation from a stable laser oscillator. The sidebands are generated upon passage of the beam from the laser through an electro-optic modulator consisting of: A GaAs waveguide structure (prism coupled) which has been etched with a 1 mm wide microwave microstrip transmission circuit - designed for use in the 12-18 GHz range - through which propagates the output from a traveling wave tube amplifier (TWTA). We have found that the heterodyne signal-to-noise ratio (SNR) depends in large part on the quality of the TWTA, and only under a unique set of circumstances can the theoretical limit for the ideal SNR (ηPr/hvB) be approached.

Paper Details

Date Published: 13 September 1989
PDF: 16 pages
Proc. SPIE 1103, Laser Radar IV, (13 September 1989); doi: 10.1117/12.960555
Show Author Affiliations
Steven A. Davidson, Massachusetts Institute of Technology (United States)
Richard S. Eng, Massachusetts Institute of Technology (United States)
Jenifer L. Bunis, Massachusetts Institute of Technology (United States)
Elaine R. Parshall, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 1103:
Laser Radar IV
Richard J. Becherer, Editor(s)

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