Abstract
Two external confocal Fabry-Perot cavity-coupled 0.83- mu m AlGaAs lasers phase-locked to one another by a heterodyne optical phase-locked loop are discussed. The phase error under phase-locking conditions was measured using the square root of the Allan variance. The result confirmed that the heterodyne signal was a full replica of the spectrum of the reference RF signal within the loop bandwidth. The estimated phase-error variance was 0.02 rad/sup 2/, i.e. approximately=8.1 degrees .< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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