<p>➀ Introduction of wavelength locking chips based on silicon photonics, highlighting their trend, functionality, and challenges with temperature dependence.</p><p>➁ Discussion on passive optical isolators based on silicon photonics, focusing on optical Kerr effect and micro-ring resonators.</p><p>➂ Presentation of a tunable C+L band laser, featuring a novel TOSA with over 100nm tuning range and high output power.</p>