Linear Frequency Swept Laser With High-Repetition-Rate Based on an Iterative Predistortion Method in the Fourier Domain

We present a novel iterative pre-distortion method in the Fourier domain, specifically designed for frequency modulated continuous wave (FMCW) laser system with high modulation frequency and exceptional linearity. A finite Fourier coefficients are used to control the laser drive voltage waveform by the predistorted method in Fourier domain. A linear frequency sweep is achieved by iterating over the waveform. The test showcases that the relative residual nonlinearity of frequency sweep is only about 0.82 %o, when an external cavity laser is modulated at repetition rate of 150 kHz. The significance of this advancement lies in its potential to increase point cloud density of FMCW Lidar measurements, making it a promising solution for a wide range of applications in diverse fields, such as autonomous vehicles, remote sensing, and environmental monitoring.