P. Coullet et al., OPTICAL EXCITABLE WAVES, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 58(5), 1998, pp. 5347-5350
We show that an optical system, a laser with an injected signal, behav
es as an excitable medium. This property gives rise to propagating pul
ses if the active medium is spatially extended. We study the propertie
s of those waves and we demonstrate that they may annihilate or cross
each other depending on the control parameter values. [S1063-651X(98)0
2503-3].