<p>➀ Surface emitting DFB lasers for short-distance applications, with features like single-mode and easy coupling;</p><p>➁ Utilizing PPR effect to increase DML bandwidth to 53GHz for short-distance LAN-WDM applications;</p><p>➂ High-power DFB sources using SCOW structure for silicon photonics applications, supporting full-temperature operation;</p><p>➃ Narrow linewidth O-band QD DFB laser with improved performance;</p><p>➄ Analysis of the performance of DFB lasers in various studies.</p>