Locking bandwidth of two laterally-coupled semiconductor lasers subject to optical injection.

ABSTRACT: We report here for the first time (to our knowledge), a new and universal mechanism by which a two-element laser array is locked to external optical injection and admits stably injection-locked states within a nontrivial trapezoidal region. The rate equations for the system are studied both analytically and numerically. We derive a simple mathematical expression for the locking conditions, which reveals that two parallel saddle-node bifurcation branches, not reported for conventional single lasers subject to optical injection, delimit the injection locking range and its width. Important parameters are the linewidth enhancement factor, the laser separation, and the frequency offset between the two laterally-coupled lasers; the influence of these parameters on locking conditions is explored

SUBMITTER: Li N 

PROVIDER: S-EPMC5758791 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature