AI 中文总结
本研究提出结合双微环Vernier滤波器与热泵浦的III-V/Si3N4外腔激光器，采用两步脉冲加热实现101/104 nm波长切换，调谐速率达8.91/9.68 nm/μs，可用于频率捷变光系统。
AI 中文摘要
快速宽范围波长切换对于频率捷变的光通信和光子系统十分必要，但热光（TO）调谐的集成激光器通常切换时间和调谐速率有限。本研究展示了混合集成的III-V/Si3N4外腔激光器（ECL），其结合双微环Vernier滤波器与热泵浦，实现宽范围快速波长控制。该ECL在1486-1614 nm范围内提供单模静态激射波长调谐；通过微加热器施加的短持续时间、高振幅脉冲热泵浦可缩短切换时间，简单的一阶热拟合能很好复现测量结果，表明热光调谐动力学高度可预测。因此，向片上微加热器施加两步脉冲热泵浦，利用初始准线性加热瞬态并在后续平衡态维持目标波长。结果显示，该方案实现了101 nm红移和104 nm蓝移切换，准线性调谐速率分别为8.91 nm/μs和9.68 nm/μs，为热光调谐ECL的快速波长切换提供了实用途径，有望拓展其在波分复用收发器等频率捷变系统中的应用。
英文摘要
Fast and wide-range wavelength switching is desirable for optical communications and photonic systems that are frequency-agile. However, thermo-optic (TO)-tuned integrated lasers often have limited switching times and tuning rates. This study demonstrates a hybrid-integrated III-V/Si3N4 external-cavity laser (ECL), combining a dual-microring Vernier filter with thermal pumping to give wide-range and fast wavelength control. The ECL provides single-mode static lasing wavelength tuning in the 1486-1614 nm range. Impulsive thermal pumping that is applied through microheaters with shorter duration and higher amplitude accelerates the switching time. A simple first-order thermal fit reproduces the measurements well, indicating that the TO-tuning dynamics are highly predictable. Consequently, two-step pulse thermal pumping is applied to the on-chip microheaters to exploit the initial quasi-linear heating transient and sustain the target wavelength at a subsequent equilibrium. The results show that 101 and 104 nm red- and blue-shift switches are achieved with quasi-linear tuning rates of 8.91 and 9.68 nm/us, respectively. This approach provides a practical route toward fast wavelength switching in TO-tuned ECLs, potentially extending their applicability within frequency-agile systems, such as wavelength-division multiplexed transceivers.
