Bidirectional Underwater Blue-green Laser Communication Based on OFDM Modulation

An underwater bidirectional laser wireless communication system based on orthogonal frequency division multiplexing (OFDM) is designed. High-power semiconductor lasers with 450nm and 520nm are employed as the light sources and APD is selected as the detector. Underwater wireless laser LAN communication based on IPV4 protocol is implemented, the communication rate of which can be up to 50Mbps. The blue-green laser communication system has the characteristics of fast transmission rate, high bandwidth, strong secrecy and small volume, which can realize LAN networking and internet connection. It has a good application prospect and practical value in the field of autonomous underwater vehicles and underwater sensor networks.