Ultra-high range resolution demonstration of a photonics-based microwave radar using a high-repetition-rate mode-locked fiber laser

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2018,（6）
• 页码范围: 88-92
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201816.062801

摘要

We experimentally demonstrate the ultra-high range resolution of a photonics-based microwave radar using a high repetition rate actively mode-locked laser (AMLL).The transmitted signal and sampling clock in the radar originate from the same AMLL to achieve a large instantaneous bandwidth.A Ka band linearly frequency modulated signal with a bandwidth up to 8 GHz is successfully generated and processed with the electro-optical upconversion and direct photonic sampling.The minor lobe suppression (MLS) algorithm is adopted to enhance the dynamic range at a cost of the range resolution.Two-target discrimination with the MLS algorithm proves the range resolution reaches 2.8 cm.The AMLL-based microwave-photonics radar shows promising applications in high-resolution imaging radars having the features of high-frequency band and large bandwidth.