Acta Optica Sinica, Volume. 40, Issue 15, 1528001(2020)
Frequency Modulated Continuous Wave LIDAR Based on Injection-Locking Technology for Simultaneous Distance and Speed Measurement
This paper proposes a method combining external modulation technology and master-slave injection-locking technology to obtain a broadband linear-chirped laser source, and the laser source is used to realize a frequency modulated continuous wave light detection and ranging (LIDAR) system for simultaneous distance and speed measurement. The master-slave injection-locking system includes a narrow line-width fiber laser as the master laser and a distributed feed-back (DFB) semiconductor laser as the slave laser, and their wavelengths are both about 1550 nm. A triangular linear-chirped microwave signal with a frequency range of 8--14 GHz is used to modulate the output from the master laser, and then the modulated laser is injected into the DFB semiconductor laser to obtain a broadband linear-chirped laser with a 6 GHz bandwidth and a side-mode suppression ratio over 20 dB. We build a frequency modulated continuous wave LIDAR based on the laser source. Using this system, we perform the distance measurement of static objects and the instantaneous measurement of distance and speed of a moving object. The distance and speed of a moving object are obtained by different formulas and verified with each other. The distance and speed resolutions are 2.5 cm and 7.8 mm/s, respectively.
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Hongying Zhang, Xiaoning Tian, Yanyang Lei, Zongda Zhu, Yongkang Dong. Frequency Modulated Continuous Wave LIDAR Based on Injection-Locking Technology for Simultaneous Distance and Speed Measurement[J]. Acta Optica Sinica, 2020, 40(15): 1528001
Category: Remote Sensing and Sensors
Received: Mar. 30, 2020
Accepted: Apr. 29, 2020
Published Online: Aug. 14, 2020
The Author Email: Dong Yongkang (aldendong@163.com)