2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/80843Combination of two basic types of synchronization, anticipated and isochronous synchronization, is investigated numerically in coupled semiconductor lasers. Due to the combination, a synchronization of good quality can be obtained. We study the dependence of the lag time between two lasers and the synchronization quality on the converse coupling retardation time $τ_{c21}$. When $τ_{c21}$ is close to the difference of external cavity round trip time $τ$ and coupling retardation time $τ_{c12}$, the combination of anticipated and isochronous synchronization may produce a better synchronization, with a lag time proportional to $τ_{c21}$. When $τ_{c21}$ is largely different from $τ-τ_{c12}$, the combination is noneffective and even negative in some cases, with a lag time independent of $τ_{c21}$.12 pages, 9 figuresChaotic Dynamicstext