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Multiplexing of frequency-modulation spectroscopy by spread-spectrum codes, demonstrated in continuous-wave LIDAR
Optics Express
|October 7, 2021
Summary
Frequency-modulation spectroscopy (FMS) enables code-division multiplexing in continuous-wave LIDAR. This method uses CO2 absorption for ranging, offering coherent detection and background rejection.
Area of Science:
- Spectroscopy
- Optical Sensing
- Laser Technology
Background:
- Frequency-modulation spectroscopy (FMS) is suitable for multiplexing.
- Continuous-wave LIDAR systems require advanced sensing techniques.
- Carbon dioxide (CO2) absorption lines offer specific spectral markers.
Purpose of the Study:
- To demonstrate code-division multiplexing capacity in continuous-wave LIDAR using FMS.
- To utilize a CO2 absorption transition at 1.6 µm for ranging.
- To retain FMS advantages like coherent detection and background rejection.
Main Methods:
- Implementing FMS in a continuous-wave LIDAR setup.
- Utilizing a sharp CO2 absorption transition at 1.6 µm.
- Employing frequency-modulated carriers tuned to specific absorption transitions.
Main Results:
- Demonstrated code-division multiplexing capability in a LIDAR system.
- Successful ranging using a CO2 absorption transition.
- Maintained coherent detection and effective rejection of broad absorption backgrounds.
Conclusions:
- FMS is effective for multiplexing in LIDAR applications.
- The approach allows for simultaneous detection of multiple transitions.
- Signal de-multiplexing reveals targets at various distances and absorption signals.
