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arXiv 2104.07309physics.optics
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基于外腔自注入的混合集成低噪声线性调频连续波laser源

Hybrid integrated low noise linearly chirped Frequency Modulated Continuous Wave laser source based on self-injection to external cavity

Liwei Tang, Hongxiang Jia, Shuai Shao, Sigang Yang, Hongwei Chen, Minghua Chen

摘要:

介绍了一种低噪声、宽频带线性调频连续波激光光源。通过二维热调谐,在静态工作条件下,激光源的本征线宽为49.86 Hz,频率连续调谐为42 GHz。对于动态FMCW,激光源在100 Hz啁啾频率下具有10.25 GHz的频率带宽,在1 kHz啁啾频率下具有5.56 GHz的频率带宽。在光纤长度测量实验中,经过预失真线性化处理后,该系统能够分辨出45 km距离处3 m的长度差异,在超长光纤传感和FMCW激光雷达中具有潜在的应用价值。

英文摘要:

A low noise linearly frequency modulated continuous wave laser source with a wide frequency bandwidth is demonstrated. By two-dimensional thermal tuning, the laser source shows 42 GHz continuous frequency tuning with 49.86 Hz intrinsic linewidth under static operation. For dynamical FMCW, the laser source has 10.25 GHz frequency bandwidth at 100 Hz chirped frequency and 5.56 GHz at 1 kHz chirped frequency. With pre-distortion linearization, it can distinguish 3 m length difference at 45 km distance in the fibre length measured experiment, which demonstrate a potential for application in ultra-long fibre sensing and FMCW LiDAR.

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