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Integrated lithium niobate photonic millimetre-wave radar
Nature Photonics ( IF 32.3 ) Pub Date : 2025-01-27 , DOI: 10.1038/s41566-024-01608-7
Sha Zhu, Yiwen Zhang, Jiaxue Feng, Yongji Wang, Kunpeng Zhai, Hanke Feng, Edwin Yue Bun Pun, Ning Hua Zhu, Cheng Wang

Millimetre-wave (mmWave) radars are key enabler in the upcoming 6G era for high-resolution sensing and detection. Conventional photonic radars are mostly realized in tabletop systems composed of bulky discrete components, whereas the more compact integrated photonic radars are difficult to reach the mmWave bands owing to the unsatisfactory bandwidths and signal integrity of the underlying electro-optic modulators. Here we overcome these challenges and demonstrate a centimetre-resolution compact photonic mmWave radar based on a 4-inch wafer-scale thin-film lithium niobate (TFLN) technology. The TFLN photonic chip consists of a first electro-optic modulator for generating broadband radar waveforms via optical frequency multiplication, and a second modulator for de-chirping the received echoes. This greatly relieves the bandwidth requirements for the digital-to-analogue converter in the transmitter and analogue-to-digital converter in the receiver. Operating in the mmWave V band (40–50 GHz), we achieve multi-target ranging with a resolution of 1.50 cm and velocity measurement with a resolution of 0.067 m s−1. Furthermore, we construct an inverse synthetic aperture radar with a two-dimensional resolution of 1.50 cm × 1.06 cm. Our integrated TFLN photonic mmWave radar chip provides a compact and cost-effective solution in the 6G era for high-resolution sensing and detection in vehicle radar, airborne radar and smart homes.



中文翻译:


集成铌酸锂光子毫米波雷达



毫米波 (mmWave) 雷达是即将到来的 6G 时代高分辨率传感和检测的关键推动因素。传统的光子雷达大多在由笨重的分立元件组成的桌面系统中实现,而更紧凑的集成光子雷达由于底层电光调制器的带宽和信号完整性不令人满意,难以达到毫米波频段。在这里,我们克服了这些挑战,并展示了基于 4 英寸晶圆级薄膜铌酸锂 (TFLN) 技术的厘米级分辨率紧凑型光子毫米波雷达。TFLN 光子芯片由第一个电光调制器组成,前者通过光倍频生成宽带雷达波形,后者用于消除接收到的回波。这大大减轻了发射器中数模转换器和接收器中模数转换器的带宽要求。在毫米波 V 波段 (40–50 GHz) 运行,我们实现了分辨率为 1.50 cm 的多目标测距和分辨率为 0.067 m s 的速度 −1 测量。此外,我们构建了二维分辨率为 1.50 cm × 1.06 cm 的逆合成孔径雷达。我们的集成式 TFLN 光子毫米波雷达芯片在 6G 时代为车载雷达、机载雷达和智能家居中的高分辨率传感和检测提供了一种紧凑且经济高效的解决方案。

更新日期:2025-01-27
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