An experimental system for underwater audio communication based on visible light

This paper presents a portable device for optical wireless transmission of audio signals in underwater visible light environment, and the system achieves the function of distortion-free audio signal transmission within a limited distance underwater. The transmitter sends the visible light signal together with the audio signal by modulating the LED light, and the receiver receives the light signal through the photoelectric conversion and amplification module. The signal is sent through the microphone amplifier and power amplifier circuit to drive the LED with the help of optical antenna for audio signal transmission, and the light detector converts the collected small current signal into voltage signal for multi-stage amplification and then drives the speaker to make sound to complete the audio signal reception.