Semiconductor lasers have always been the most important and practical class of lasers due to their high efficiency, small size, wide luminous range, and low price. Among them, near 1.5 μm is avery important band in semiconductor lasers. At present, this band has been widely used in medical, laser radar, optical fiber communication, confidential communication, military industry and other fields. 1.5 μm nearby semiconductor lasers generally use distributed feedback and distributed Bragg grating structures. In the active region, the quantum well structure is currently the most mature, and the quantum dot structure is also in the process of continuous research. This article focuses on semiconductor lasers in the 1.5 μm band, mainly discusses quantum well lasers and quantum dot lasers, including DFB and DBR structures, describes the technological development of nano low-dimensional structure lasers, analyzes its technical characteristics, and the technical development trend of 1.5 μm band semiconductor lasers is prospected.
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