可调谐激光器已经成为相干光传输系统中最重要的器件之一。文章基于现有的集成可调谐激光器模块，提出了一种新型的基于硅基光波导芯片实现器件高稳定性的小型化结构，基于该结构设计的微环可调谐激光器的外腔主要由一个半导体光放大器和两个透镜组成。针对器件进行了外置波锁分析和芯片的耦合分析，芯片与半导体光放大器之间的耦合采用双透镜和模斑转换器，因此大大提高了耦合效率，减小了腔内损耗，提高了输出功率。实验结果表明，该装置的输出功率可达14 dBm，调谐范围可覆盖整个C波段。

Tunable laser has become one of the most important components in coherent optical transmission system. Based on the existing integrated tunable laser module, a novel kind of miniaturized structure to realize high stability of devices is proposed in this paper, which is fabricated on silicon photonic-wire waveguides. The external cavity of lasers based on this structure is composed of an Semiconductor Optical Amplifier (SOA), silicon micro-ring chip and two lenses. The paper analyzes the external wave locking and chip coupling. In our proposed scheme, the double lens and Spot Size Converter (SSC) are used for coupling between SOA and silicon chip, which can greatly reduce the cavity loss, improve the output power and coupling efficiency. The lasers have shown a wide tunning range covering the C bands and the output power can reach 14 dBm.