Abstract

We report on fabrication and characterization of single-longitudinal- and transverse-mode semiconductor ring lasers. A bifurcation from bidirectional stable operation to a regime with alternate oscillations of the counterpropagating modes was observed experimentally and is theoretically explained through a two-mode model. Analytical expressions for the onset and the frequency of the oscillations are derived, and $L–I$ curves numerically evaluated. Good quantitative agreement between theory and measurements made over a large number of tested devices is obtained.

© 2002 Optical Society of America

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