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

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 relationsh...

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Veröffentlicht in:	Remote sensing (Basel, Switzerland) Switzerland), 2022-07, Vol.14 (14), p.3455
Hauptverfasser:	Li, Peng, Zhang, Yating, Yao, Jianquan
Format:	Artikel
Sprache:	eng
Schlagworte:	Algorithms Continuous wave lasers Distortion FMCW LiDAR Frequency dependence frequency swept nonlinearity Iterative methods iterative pre-distortion Laser outputs Lasers Lidar Light Linearity Nonlinear systems Remote sensing Semiconductor lasers zero crossings method
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Zusammenfassung:	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.
ISSN:	2072-4292 2072-4292
DOI:	10.3390/rs14143455