Alternate oscillations in semiconductor ring lasers

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 OCIS codes: 140.3560, 230.3120, 190.3100.