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AWG-Based Spectral Multiplexing for Unambiguous Range-Extended FMCW LiDAR
Sangwon Park1, Sang Min Park2, Seongmun Jeong1
1Department of Optics and Mechatronics Engineering, Pusan National University, Busan 46241, Republic of Korea.
Sensors (Basel, Switzerland)
|March 14, 2026
Summary
This study introduces an extended-range Frequency-Modulated Continuous-Wave (FMCW) Light Detection and Ranging (LiDAR) system using spectral multiplexing. The novel approach significantly enhances measurable range and resolves distance ambiguity for improved 3D mapping.
Area of Science:
- Optoelectronics
- Photonics
- LiDAR Technology
Background:
- Frequency-modulated continuous-wave (FMCW) Light Detection and Ranging (LiDAR) offers high-resolution, ambient light-robust distance measurement.
- Current FMCW LiDAR faces range limitations due to laser coherence length and distance ambiguity from frequency issues.
Purpose of the Study:
- To develop an unambiguous, range-extended FMCW LiDAR system.
- To overcome the inherent limitations of conventional FMCW LiDAR for greater application potential.
Main Methods:
- Implementation of arrayed waveguide grating (AWG)-based spectral multiplexing to create multiple wavelength channels.
- Utilizing sequentially designed optical path delays within the reference arm for independent interference signals.
- Development of a channel-pair-based distance decoding algorithm to resolve ambiguity.
Main Results:
- The proposed FMCW LiDAR system achieved an extended measurable range approximately five times greater than conventional systems.
- High measurement accuracy was demonstrated through experimental validation.
- Successful reconstruction of three-dimensional distance maps was achieved.
Conclusions:
- The AWG-based spectral multiplexing and decoding algorithm effectively extend FMCW LiDAR range and resolve ambiguity.
- The system shows significant potential for advanced, extended-range FMCW LiDAR applications.
- This technology enables more robust and precise 3D environmental sensing.
