A hybrid integrated low-noise linear chirp frequency-modulated continuous-wave (FMCW) laser source with a wide frequency bandwidth is demonstrated. By employing two-dimensional thermal tuning, the laser source shows frequency modulation bandwidth of 10.3 GHz at 100 Hz chirped frequency and 5.6 GHz at 1 kHz chirped frequency. The intrinsic linewidth of 49.9 Hz with 42 GHz continuous frequency tuning bandwidth is measured under static operation. Furthermore, by pre-distortion linearization of the laser source, it can distinguish 3 m length difference at 45 km distance in the fiber length measurement experiment, demonstrating its application potential in ultra-long fiber sensing and FMCW light detection and ranging.

中文翻译：

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基于外腔自注入的混合集成低噪声线性啁啾调频连续波激光源

展示了具有宽频带宽的混合集成低噪声线性啁啾调频连续波 (FMCW) 激光源。通过采用二维热调谐，激光源在 100 Hz 啁啾频率下显示 10.3 GHz 的频率调制带宽，在 1 kHz 啁啾频率下显示 5.6 GHz 的频率调制带宽。49.9 Hz 的固有线宽和 42 GHz 连续频率调谐带宽是在静态操作下测量的。此外，通过激光源的预失真线性化，在光纤测长实验中可以区分45km距离处3m的长度差，展示了其在超长光纤传感和FMCW光检测测距中的应用潜力。