Frequency Modulation (FM) sounds simple at first, but understanding the electronics behind modulation and demodulation of an FM signal can be confusing.

Discussing the slope detection FM demodulation method where a bandpass slope is used to create a slope-induced amplitude modulation.

Aeva and Blackmore modulate the frequency of the laser wave instead of the amplitude. The lasers don't pulse, as AM lidar does. Instead, small frequency changes are made to a continuous wave.