超快可调谐光子集成 Pockels 扩展 DBR 激光器
Ultrafast tunable photonic integrated Pockels extended-DBR laser
AI总结：
提出一种基于 LNOI 电光 DBR PIC 与 RSOA 混合集成的 E-DBR Pockels 激光器，仅需单一模拟输入即可实现快速无跳模调谐、高功率与窄线宽，并通过 FMCW LiDAR 和光谱实验验证。
摘要：
兼具低噪声特性与快速无跳模频率调谐的捷变频激光器，是从调频连续波（FMCW）激光雷达到相干光通信和气体传感等应用的关键组件。近来，III-V 族增益介质与低损耗光子集成电路（PIC）的混合集成，已使集成激光器实现了比包括光纤激光器在内的最佳传统系统更快的调谐和更低的相位噪声。此外，绝缘体上铌酸锂（LNOI）PIC 使利用 Pockels 效应展示调谐速率达每秒拍赫兹的自注入锁定混合激光器成为可能。然而，依赖高 Q 值光学微谐振器的 Pockels 可调谐激光器原型迄今只能实现有限的输出功率，并且由于自注入锁定的动力学而难以操作和稳定，还需要许多模拟控制参数。在这里，我们利用扩展分布式布拉格反射镜（E-DBR）架构克服了这一挑战，展示了一种简单、可“交钥匙”运行的捷变频 Pockels 激光器，该激光器可通过单一模拟操作和调制输入进行控制。我们的激光器支持超过 10 GHz 的连续无跳模调谐范围，具有良好的线性以及高达 10 MHz 的平坦驱动带宽，同时在 1545 nm 处实现超过 15 mW 的光纤内输出功率和 kHz 级本征线宽，这一组合是传统体激光器所未能达到的。这种混合激光器设计将廉价的反射式半导体光放大器（RSOA）与在 LNOI 平台上以晶圆级规模制造的电光 DBR PIC 相结合。我们在概念验证的相干光学测距（FMCW LiDAR）演示中展示了该激光器的性能和灵活性，实现了 4 cm 的距离分辨率，并在氰化氢光谱实验中进行了展示。
英文摘要：
Frequency-agile lasers that can simultaneously feature low noise characteristics as well as fast mode hop-free frequency tuning are keystone components for applications ranging from frequency modulated continuous wave (FMCW) LiDAR, to coherent optical communication and gas sensing. The hybrid integration of III-V gain media with low-loss photonic integrated circuits (PICs) has recently enabled integrated lasers with faster tuning and lower phase noise than the best legacy systems, including fiber lasers. In addition, lithium niobate on insulator (LNOI) PICs have enabled to exploit the Pockels effect to demonstrate self-injection locked hybrid lasers with tuning rates reaching peta-hertz per second. However, Pockels-tunable laser archetypes relying on high-Q optical microresonators have thus far only achieved limited output powers, are difficult to operate and stabilize due to the dynamics of self-injection locking, and require many analog control parameters. Here, we overcome this challenge by leveraging an extended distributed Bragg reflector (E-DBR) architecture to demonstrate a simple and turn-key operable frequency-agile Pockels laser that can be controlled with single analog operation and modulation inputs. Our laser supports a continuous mode hop-free tuning range of over 10 GHz with good linearity and flat actuation bandwidth up to 10 MHz, while achieving over 15 mW in-fiber output power at 1545 nm and kHz-level intrinsic linewidth, a combination unmet by legacy bulk lasers. This hybrid laser design combines an inexpensive reflective semiconductor optical amplifier (RSOA) with an electro-optic DBR PIC manufactured at wafer-scale on a LNOI platform. We showcase the performance and flexibility of this laser in proof-of-concept coherent optical ranging (FMCW LiDAR) demonstration, achieving a 4 cm distance resolution and in a hydrogen cyanide spectroscopy experiment.
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