In the pulsed beam case, the laser actually sweeps across your ear at the desired audio frequency. Each method has advantages and disadvantages. Modulated light creates a higher fidelity sound.

Scientists have developed a dual-laser Brillouin optical correlation-domain reflectometry (BOCDR) system that uses two ...

Receiving frequency-modulated radio waves is typically more difficult than their amplitude-modulated cousins because the circuitry necessary to demodulate an FM signal needs a frequency-to-voltage ...