Research progress of laterally coupled DFB - LD

摘要

The laterally coupled DFB-LD shows unique advantages to achieve single longitudinal mode LD, which has attracted the attention of researchers both at home and abroad in recent years. The laterally coupled DFB-LD can not only effectively solve wavelength stability problem of a LD, but also can realize high performance devices owing to its monolithic preparation technology. It is of great importance to the development of small, efficient and low-cost wavelength locked semiconductor lasers. In this paper, we analyzed laterally coupled DFB-LD in terms of its structural characteristics, operating mechanism, and output characteristics. As the grating position is different from that of the traditional Bragg grating, some technical methods are explored and the main research advances over the world are reviewed. Finally, its development prospects are forecasted.