L. Wallace et al., Synchronization of power dropouts in coupled semiconductor lasers with external feedback - art. no. 013809, PHYS REV A, 6301(1), 2001, pp. 3809
We present experimental evidence that the outputs in two unidirectionally c
oupled semiconductor lasers with an external cavity, when operated in the r
egime of low-frequency fluctuations, are synchronized in their dropout even
ts but remain uncorrelated in the process of power recovery. We characteriz
e such synchronized cyclic motions by measuring the difference of their Hil
bert phases and entropy index. Our analysis of the coupled Lang-Kobayaski e
quations in a master-slave configuration attributes the observed phenomenon
to the different dynamical behavior of the slave laser in the buildup and
plateau regions in phase space: the local unstable ol bits are robust again
st coupling in the former but more susceptible to intervention in the latte
r.