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Coherent line-beam LiDARs using polymer waveguide optical phased array.

Jinung Jin, Eun-Su Lee, Kwon-Wook Chun

|March 18, 2026

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This study introduces a novel coherent detecting LiDAR system using a polymer waveguide optical phased array (OPA) for faster 4D point cloud acquisition. The system efficiently distinguishes stationary and moving targets by measuring distance and velocity simultaneously.

Area of Science:

Photonics and Optical Engineering
LiDAR Technology
Waveguide Optics

Background:

Coherent detecting LiDAR systems are crucial for remote sensing.
Traditional LiDAR systems face limitations in acquisition speed and target discrimination.
Polymer waveguide optical phased arrays (OPAs) offer potential for advanced optical beam steering.

Purpose of the Study:

To demonstrate a coherent detecting LiDAR system utilizing a polymer waveguide OPA.
To improve the acquisition time for 4D point cloud data.
To enable simultaneous distance and velocity measurements for target differentiation.

Main Methods:

Fabrication and integration of a 128-element polymer waveguide OPA.
Utilizing a directly modulated DFB laser with a linear chirp rate of 83 THz/s.

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Implementing an iterative chirp linearization process for precise Doppler frequency measurement.

Employing a line beam scanning method for reduced acquisition time compared to raster scanning.

Main Results:

Demonstrated a low-power, efficient phase modulation using the polymer waveguide OPA.
Achieved a line-beam output from the end-fired waveguide array.
Successfully reduced acquisition time for 4D point cloud data.
Showcased simultaneous distance and velocity detection with the fabricated OPA chip (30°×32° FoV, 6.5 dB insertion loss).

Conclusions:

The developed polymer waveguide OPA LiDAR system enables faster 4D point cloud acquisition.
The system effectively distinguishes between stationary and moving targets through simultaneous distance and velocity measurement.
This approach offers a significant advancement over conventional LiDAR scanning methods.