Shulou(Shulou.com)11/24 Report--

Thanks to CTOnews.com netizen grass Luo Yuzi for the clue delivery! CTOnews.com March 19 news, according to Peking University School of Electronics March 14 news, Peking University School of Electronics Professor Wang Xingjun's research group-Chang Lin researcher research group on the basis of two years of research, developed a new silicon substrate multi-channel chaotic light source, proposed a chaotic optical comb-based parallel lidar architecture, overcome the lidar anti-jamming and high-precision parallel detection of these two worldwide problems, to ensure high performance and high safety at the same time, Greatly reduce the size, complexity, power consumption and cost of future lidar systems.

According to reports, with the increasing popularity of high-level automatic driving, lidar, which ensures driving comfort and safety, has received more and more attention as its core device. High performance, small size, low cost, low power consumption and high safety lidar is the direction that future manufacturers are chasing.

The research team generated a natural multi-channel random modulation signal by integrating the modulation instability state of the microcavity optical comb, and its signal chaotic bandwidth can exceed 7GHz, and the modulation instability state of the optical comb shows good robustness in the detuning range of 18GHz, which can cope with the frequency jitter of the external pump light source. Meanwhile, the threshold power of the modulated unstable comb is 1-2 orders of magnitude lower than that of other material platforms due to the high nonlinear coefficient of the material, and can be co-integrated with on-chip DFB lasers.

▲ Integrated parallel chaotic lidar system architecture On this basis, the research team built a parallel lidar demonstration system and carried out high-precision three-dimensional imaging on the physical target, verified the single-pixel imaging of 10-channel scale, and proved good orthogonal isolation between each channel. In addition, the research team also tested the anti-noise power suppression ratio of the received signal under different signal interference aliasing. The measured results show that under the threshold criterion of 3dB and the integration time of 12.5μm, the power dynamic range of the single-channel signal is close to 60dB, the anti-noise power suppression ratio of the FM continuous wave signal is close to 30dB, and the anti-noise power suppression ratio of the random modulation signal can reach 22dB, showing good active anti-interference capability. These results are expected to promote the next generation of high-performance anti-jamming lidar revolution.

CTOnews.com queries learned that the team's research results,"Breaking the temporal and frequency congregation of LiDAR by parallel chaos," were published in Nature Photonics on March 13, 2023.

The co-first authors of this paper are Chen Ruixuan, Shu Haowen, researcher, doctoral student Shen Bitao and Chang Lin, postdoctoral fellow of Peking University School of Electronics. Wang Xingjun, John E. Professor Bowers and Chang Lin are the corresponding authors of the paper. The main collaborators include Dr. Xie Weiqiang of University of California Santa Barbara (now associate professor of Shanghai Jiaotong University), Liao Wenchao, postdoctoral student of School of Electronics of Peking University, and Tao Zihan, doctoral student. This work is completed by the State Key Laboratory of Regional Optical Fiber Communication Network and New Optical Communication System of School of Electronics, Peking University as the first unit.

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