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Proceedings Paper

Spectral characterization of microwave signals generated by the heterodyne of injection-locked semiconductor lasers
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Paper Abstract

Optical heterodyne has been proposed to generate the microwave signals to be used in phased array antenna systems. Optical injection-locking of secondary lasers to distinct FM-sidebands of a current-modulated laser diode has been used to improve the spectral purity of the microwave signal generated by heterodyne. A very narrow linewidth microwave signal superimposed over a Lorentzian shaped noise floor has been obtained. The spectral purity of the produced microwave signal has been characterized by three distinct means: power spectrum, phase fluctuations, and time-domain frequency stability (Allan variance). The power spectrum shows a linewidth smaller than 25 mHz (FWHM) and the Allan standard deviation gives a level 1 X 10-11 for an averaging time of 1 sec.

Paper Details

Date Published: 10 June 1994
PDF: 14 pages
Proc. SPIE 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV, (10 June 1994); doi: 10.1117/12.177426
Show Author Affiliations
Martin Chamberland, Univ. Laval (Canada)
Michel Tetu, Univ. Laval (Canada)
Pierre Tremblay, Univ. Laval (Canada)

Published in SPIE Proceedings Vol. 2155:
Optoelectronic Signal Processing for Phased-Array Antennas IV
Brian M. Hendrickson, Editor(s)

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