Opt Lett. 2022 Dec 1;47(23):6237-6240. doi: 10.1364/OL.475909.
A four-laser array based on sampled Bragg grating distributed feedback (DFB) lasers in which each sampled period contains four phase-shift sections is proposed, fabricated, and experimentally demonstrated. The wavelength spacing between adjacent lasers is accurately controlled to 0.8 nm ± 0.026 nm and the lasers have single mode suppression ratios larger than 50 dB. Using an integrated semiconductor optical amplifier, the output power can reach 33 mW and the optical linewidth of the DFB lasers can be as narrow as 64 kHz. This laser array uses a ridge waveguide with sidewall gratings and needs only one metalorganic vapor-phase epitaxy (MOVPE) step and one III-V material etching process, simplifying the whole device fabrication process, and meeting the requirements of dense wavelength division multiplexing systems.
提出并制作了一种基于取样布拉格光栅分布式反馈（DFB）激光器的四激光阵列，其中每个取样周期包含四个相移段。相邻激光器之间的波长间隔精确控制在 0.8nm±0.026nm，激光器的单模抑制比大于 50dB。使用集成半导体光放大器，输出功率可达 33mW，DFB 激光器的光谱线宽可窄至 64kHz。该激光阵列采用具有侧壁光栅的脊形波导，仅需经过一次金属有机气相外延（MOVPE）步骤和一次 III-V 材料刻蚀工艺，简化了整个器件制造工艺，满足密集波分复用系统的要求。
