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Related Experiment Video

Updated: Sep 16, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

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Enhanced High-Resolution and Long-Range FMCW LiDAR with Directly Modulated Semiconductor Lasers.

Luís C P Pinto1,2, Maria C R Medeiros1,2

  • 1Instituto de Telecomunicações (IT), 3030-290 Coimbra, Portugal.

Sensors (Basel, Switzerland)
|July 12, 2025
PubMed
Summary
This summary is machine-generated.

This study optimizes frequency-modulated continuous wave (FMCW) LiDAR signals using pre-distortion techniques. This advancement enables highly accurate, long-range distance measurements crucial for autonomous driving applications.

Keywords:
FMCW LiDARchirp linearizationsemiconductor laser

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Area of Science:

  • Photonics and Semiconductor Technology
  • Optical Sensing and Metrology

Background:

  • Light Detection and Ranging (LiDAR) sensors are vital for precise distance and velocity measurements.
  • Frequency-Modulated Continuous Wave (FMCW) LiDAR offers advantages in sensitivity, range resolution, and velocity measurement.
  • Integrating LiDARs onto semiconductor chips promises reduced cost, size, and power consumption.

Purpose of the Study:

  • To address the challenge of nonlinearity in semiconductor lasers used for FMCW signal generation.
  • To develop a method for pre-distorting driving waveforms to achieve linear FMCW signals.
  • To demonstrate a high-performance FMCW LiDAR system suitable for autonomous driving.

Main Methods:

  • Employed pre-distortion techniques to compensate for inherent chirp nonlinearity in semiconductor lasers.
  • Optimized driving waveforms for direct current modulation of semiconductor lasers.
  • Achieved frequency nonlinearities of 0.0029% for both up-ramp and down-ramp signals at 55 kHz.

Main Results:

  • Demonstrated a highly accurate LiDAR system with a range resolution under 5 cm.
  • Achieved operation over a 210-m range via single-mode fiber transmission.
  • Extrapolated free-space operational range of approximately 308 meters.

Conclusions:

  • Pre-distortion effectively linearizes FMCW signals from directly modulated semiconductor lasers.
  • The developed LiDAR system meets critical requirements for long-range autonomous driving.
  • This work paves the way for cost-effective, high-performance LiDAR integration.