Coherent beam combination of coupled semiconductor lasers is a powerful technique for achieving high-power and well-defined output beams. In particular, phased-locked semiconductor laser arrays can produce patterns with high-emission radiance. In this publication, the authors present numerical findings on coherent coupling between two laterally-coupled quantum dot semiconductor lasers. Brightness improvement is achieved by considering many longitudinal modes in the weak coupling regime. In addition, simulations incorporate the important contributions of the gain broadening mechanisms in the quantum dot material. The paper shows that the spectral behavior of lasing modes in the coupled lasers depends on the coupling coefficient and the frequency detuning between the lasers. On top of that, for cavity lengths with a minute difference and a specific homogeneous broadening, a full phase-locking regime associated with a single-mode operation is reported provided that the coupling coefficient reaches a critical value. These results demonstrate that strong coherent coupling between two quantum dot lasers can take place, which is promising for future applications in optical communications and signal processing.

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