Coherence resonance occurring in semiconductor lasers with optical feedback
is studied via the Lang-Kobayashi model with external nonwhite noise in th
e Pumping current. The temporal correlation and the amplitude of the noise
have a highly relevant influence in the system, leading, to an optimal cohe
rent response for suitable values of both the noise amplitude and correlati
on time. This phenomenon is quantitatively characterized by means of severa
l statistical measures.