Parallel all-optical encoded CDMA-driven anti-interference LiDAR for 78 MHz point acquisition
并行全光编码CDMA驱动的抗干扰激光雷达，用于78 MHz点位获取
78MHzポイント取得のための並列全光エンコードCDMA駆動アンチインターフェアリングLiDAR
78 MHz 포인트 획득을 위한 병렬 올-옵티컬 인코딩 CDMA 구동 반-인터페런스 LiDAR
LIDAR antiinterferencias impulsado por CDMA codificado ópticamente paralelo para adquisición de puntos de 78 MHz
LiDAR anti-interférence à code CDMA entièrement optique parallèle pour l'acquisition de points à 78 MHz
Параллельный полностью оптический закодированный CDMA-управляемый противомешающий LiDAR для сбора точек на частоте 78 МГц
Shujian Gong 龚舒健 ¹ ² ³, Peng Tian 田鹏 ¹ ², Yinghui Guo 郭迎辉 ¹ ² ³ ⁴, Xiaoyin Li 李晓银 ¹ ², Mingbo Pu 蒲明博 ¹ ² ³ ⁴, Qi Zhang 张其 ¹ ², Yanqin Wang 王彦钦 ¹ ³, Heping Liu 刘何平 ⁵, Xiangang Luo 罗先刚 ¹ ² ³
¹ State Key Laboratory of Optical Field Manipulation Science and Technology, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
中国 成都 中国科学院光电技术研究所 光场调控科学技术全国重点实验室
² Research Center on Vector Optical Fields, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
中国 成都 中国科学院光电技术研究所 矢量光场研究中心
³ College of Materials Sciences and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
中国 北京 中国科学院大学材料科学与光电技术学院
⁴ Sichuan Provincial Engineering Research Center of Digital Materials, Chengdu, 610213, China
中国 成都 四川省数字材料工程研究中心
⁵ Tianfu Xinglong Lake Laboratory, Chengdu, 610213, China
中国 成都 天府兴隆湖实验室
High-speed, precise 3D sensing is essential for autonomous driving, robotics, and remote sensing, with light detection and ranging (LiDAR) as the leading technology. Nevertheless, single-channel LiDAR is bottlenecked by the light’s round-trip delay, limiting its point acquisition rate (PAR). While parallel detection can overcome this, current solutions either require multiple detectors—adding complexity—or are hampered by electronic encoder speeds, restricting scalability and resolution.
Here, we propose a parallel anti-interference LiDAR architecture based on code-division multiple access (CDMA) with all-optical encoding. A broadband source is split by wavelength-division multiplexing (WDM) into two spectral channels, each encoded with an orthogonal sequence via fiber splitters. A single-pixel photodetector captures mixed echoes, and matched filtering separates the channels for precise time-of-flight (TOF) extraction—achieving parallel detection with minimal hardware. Experimentally, operating at a 25.6 ns emission period, the system attains a dual-channel PAR of 78 MHz (ambiguity distance of 3.84 m) with ~2 mm ranging precision (standard deviation) under motion.
Furthermore, even at an extremely low signal-to-interference ratio (SIR) of −13 dB, the scheme retains over 50% valid demodulated points, validating its superior interference resilience. This low-complexity, highly integrable architecture establishes a critical foundation for ultrafast, high-precision, anti-interference 3D imaging in autonomous vehicles, drones, and robotics.
