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Recently, McInerney, Reekie, and Bradley observed bistability in twin diode GaAs/GaAlAs injection lasers in an external cavity when both diodes were above threshold. We show that this bistability may be explained by a form of self-focusing which is produced by induced waveguiding in the wide stripe lasers. A detailed analysis is performed on a standard model of these diodes in an external cavity. We have found very good agreement between theory and experiment.
Hefferman, D., McInerney, J., Reekie, L., Bradley, D.: Bistabiity by induced waveguiding in coupled semiconductor lasers. IEEE Journal of Quantum Electronics, Sept. 1985, Vol.21, issue 9, pp.1505-1512.