Sun Xiao, Li Zhibo, Fan Yizhe, Al-Rubaiee Mohanad Jamal, Marsh John H, Kelly Anthony E, Sweeney Stephen J, Hou Lianping
Opt Lett. 2025 Feb 1;50(3):714-717. doi: 10.1364/OL.542734.
We present the first, to our knowledge, demonstration of a 1550 nm multi-wavelength distributed feedback (MW-DFB) laser employing a third-order, four-phase-shifted sampled sidewall grating. By utilizing linearly chirped sampled gratings and incorporating multiple true π-phase shifts within a cavity, we achieved and experimentally validated a four-wavelength laser with a channel spacing of 0.4 nm. The device operates stably and uniformly across a wide range of injection currents from 280 mA to 350 mA. The average wavelength spacing was measured at 0.401 nm with a standard deviation of 0.0081 nm. Additionally, we demonstrated a 0.3 nm MW-DFB laser with a seven-channel output, achieving a wavelength spacing of 0.274 nm and a standard deviation of 0.0055 nm. This MW-DFB laser features a ridge waveguide with sidewall gratings, requiring only one metalorganic vapor-phase epitaxy (MOVPE) step and a single III-V material etching process. This streamlined fabrication approach simplifies device manufacturing and is well-suited for dense wavelength division multiplexing (DWDM) systems.
据我们所知，我们首次展示了一种采用三阶四相移采样侧壁光栅的1550 nm多波长分布反馈（MW-DFB）激光器。通过利用线性啁啾采样光栅并在腔内引入多个真正的π相移，我们实现了并通过实验验证了一种通道间距为0.4 nm的四波长激光器。该器件在280 mA至350 mA的宽注入电流范围内稳定且均匀地工作。测得的平均波长间距为0.401 nm，标准偏差为0.0081 nm。此外，我们展示了一种具有七通道输出的0.3 nm MW-DFB激光器，实现了0.274 nm的波长间距和0.0055 nm的标准偏差。这种MW-DFB激光器具有带侧壁光栅的脊形波导，仅需要一步金属有机气相外延（MOVPE）工艺和一次III-V族材料蚀刻工艺。这种简化的制造方法简化了器件制造，非常适合密集波分复用（DWDM）系统。
