Rapid Linear Frequency Swept Frequency-Modulated Continuous Wave Laser Source Using Iterative Pre-Distortion Algorithm

被引：17

作者：

Li, Peng ^{[1
]}

Zhang, Yating ^{[1
]}

Yao, Jianquan ^{[1
,2
]}

机构：

[1] Tianjin Univ, Sch Precis Instrument & Optoelect Engn, Minist Educ Optoelect Informat Technol, Key Lab, Tianjin 300072, Peoples R China

[2] South Univ Sci & Technol China, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

来源：

REMOTE SENSING | 2022年 / 14卷 / 14期

基金：

中国国家自然科学基金;

关键词：

iterative pre-distortion; FMCW LiDAR; frequency swept nonlinearity; zero crossings method; LIDAR; LINEARIZATION; SWEEP; INJECTION;

D O I：

10.3390/rs14143455

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We present a simple iterative pre-distortion algorithm for achieving a rapid linear frequency sweep of semiconductor lasers. The algorithm achieves the desired frequency swept linearity with only four iterations. We derive a general formula for iterative pre-distortion by establishing the relationship between the laser output frequency and the drive current. The linear frequency-swept laser source obtained by this algorithm can be used in FMCW LiDAR systems. Experimentally, we investigated the algorithm using a 1550 nm distributed feedback (DFB) laser, achieving frequency swept excursion of 30.26 GHz, and frequency swept slope of 504 THz/s. We analyzed the linearity of the frequency swept results for the fourth iteration, achieving less than 5 MHz root mean square (RMS) value of frequency swept nonlinearity.

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页数：11

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