Theoretical prediction of cavity solitons in a face-to-face VCSELs configuration

This paper theoretically investigates, the localized structures formation in a system made of two broad-area VCSELs, one acting as a saturable absorber, mutually coupled and separated by a distance order of magnitude greater than their typical size. Because of the "small" (compared with the gain linewidth) free spectral range of the "external" cavity delimited by the two VCSELs, this system is one of the best candidate for the demonstration of the "pulsed cavity soliton" laser which would surely have a great impact for applications to all-optical information processing. By using a suitable change of variables we efficiently reduced it to a system of two coupled sets of partial differential equations (one for each VCSEL) whose numerical integration does not require an extremely high computational load.