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

Shaofu Xu; Weiwen Zou; Guang Yang; Jianping Chen

doi:10.3788/COL201816.062801

Journals >Chinese Optics Letters >Volume 16 >Issue 6 >Page 062801 > Article

Chinese Optics Letters
Vol. 16, Issue 6, 062801 (2018)

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

Shaofu Xu, Weiwen Zou^*, Guang Yang, and Jianping Chen

Author Affiliations

State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Institute for Advanced Communication and Data Science, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

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DOI: 10.3788/COL201816.062801 Cite this Article Set citation alerts

Shaofu Xu, Weiwen Zou, Guang Yang, Jianping Chen. Ultra-high range resolution demonstration of a photonics-based microwave radar using a high-repetition-rate mode-locked fiber laser[J]. Chinese Optics Letters, 2018, 16(6): 062801 Copy Citation Text

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Abstract

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.