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Proceedings Paper

Direct current modulation of a photomixing signal
Author(s): Florin L. Constantin
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Paper Abstract

Direct modulation of the bias voltage of a LTG-GaAs photomixer is exploited to modulate the signal generated at the frequency of the optical beat between two diode lasers at 820 nm. The photomixing signal is calculated from an expansion in power series of the amplitude of the modulation voltage and displays amplitude modulation sidebands equidistantly spaced to the frequency of the optical beat by integer multiples of the modulation frequency. Modulation at harmonics of the modulation frequency is allowed by the electrical nonlinear response of the photomixer, driven at low voltage by the saturation of the electron drift velocity. Coupling of an alternative voltage to the photomixer operated at zero-bias leads to bifrequency operation. Modulation of the photomixing signal and bifrequency operation of the photomixer are observed experimentally with an optical beat in the microwave regime.

Paper Details

Date Published: 27 April 2016
PDF: 7 pages
Proc. SPIE 9894, Nonlinear Optics and its Applications IV, 98941K (27 April 2016); doi: 10.1117/12.2227788
Show Author Affiliations
Florin L. Constantin, Lab. PhLAM, CNRS (France)

Published in SPIE Proceedings Vol. 9894:
Nonlinear Optics and its Applications IV
Benjamin J. Eggleton; Neil G. R. Broderick; Alexander L. Gaeta, Editor(s)

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