Opt Lett. 2023 Jan 15;48(2):359-362. doi: 10.1364/OL.478765.
We report, to the best of our knowledge, the first demonstration of a 1555-nm stepped-height ridge waveguide polarization mode converter monolithically integrated with a sidewall grating distributed-feedback (DFB) laser using the identical epitaxial layer scheme. The device shows stable single longitudinal mode (SLM) operation with the output light converted from TE to TM polarization with an efficiency of >94% over a wide range of DFB injection currents (IDFB) from 140 mA to 190 mA. The highest TM mode purity of 98.2% was obtained at IDFB = 180 mA. A particular advantage of this device is that only a single step of metalorganic vapor-phase epitaxy and two steps of III-V material dry etching are required for the whole integrated device fabrication, significantly reducing complexity and cost.
据我们所知，我们首次展示了使用相同的外延层方案，将 1555nm 阶梯高度脊波导偏振模式转换器与侧面光栅分布式反馈（DFB）激光器单片集成的结果。该器件在从 140mA 到 190mA 的宽 DFB 注入电流（IDFB）范围内，显示出稳定的单纵模（SLM）工作状态，输出光从 TE 偏振转换为 TM 偏振，效率>94%。在 IDFB=180mA 时，获得了最高的 TM 模式纯度为 98.2%。该器件的一个独特优势是，整个集成器件制造仅需要进行单步金属有机气相外延和两步 III-V 材料干法刻蚀，显著降低了复杂性和成本。
