Phase space of tristability in dual injection-locked Fabry-Perot laser diodes

By using the model of an optically bistable injection-locked semiconductor Fabry-Perot laser diode, we theoretically investigate the case of dual injection-locking, in which the two light signals are simultaneously externally injected into the cavity of a slave laser. We show that dual injection-locking leads to formation of new stationary points, i.e., to optical tristability of the slave laser. We analyze the range of injection power and frequency detuning for which this tristability occurs.