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

Martin Chamberland; Michel Tetu; Pierre Tremblay

doi:10.1117/12.177426

10 June 1994 Spectral characterization of microwave signals generated by the heterodyne of injection-locked semiconductor lasers

Martin Chamberland, Michel Tetu, Pierre Tremblay

Author Affiliations +

Proceedings Volume 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV; (1994) https://doi.org/10.1117/12.177426
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

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.

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Martin Chamberland, Michel Tetu, and Pierre Tremblay "Spectral characterization of microwave signals generated by the heterodyne of injection-locked semiconductor lasers", Proc. SPIE 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV, (10 June 1994); https://doi.org/10.1117/12.177426

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