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
M. Sorel, P. J. R. Laybourn, A. Scirè, S. Balle, G. Giuliani, R. Miglierina, and S. Donati, "Alternate oscillations in semiconductor ring lasers," Opt. Lett. 27, 1992-1994 (2002)