Performance of Underwater Audio Transmission Based on Underwater Visible Light Communication (UVLC)

Currently, underwater communication is limited to sign language or additional tools such as a blackboard. Underwater voice communication itself is still becoming resistant due to acoustic waves, which have a propagation distance far but only have a small data rate (about kbps), and Radio Frequency (RF) which has a very short propagation distance, but with a high data rate (range up to Mbps). Underwater Visible Light Technology Communication (UVLC) was initiated to replace the role of waves carrier because besides having a long propagation distance, it also has a high data rate (up to Gbps). This research has tested the indoor and underwater channel tools with artificial seawater media. The transmitter uses Light Emitting Diode (LED) Super bright green LED or 500 nm wavelength, and the receiver uses a Positive Intrinsic Negative (PIN) photodiode of type BPW34. The experiment test scenario includes increasing the propagation distance and changing the angle. The output of this research is in the form of power received in dBm, internal sound level decibels a-weighting (dBA). After extensive testing, the result shows that the devices performance was stable, both indoor and underwater analysis. We also prove that the value of the received power and the sound level for excellent communication on the indoor channel is -6 dBm and 98.8 dBA. In addition, in the underwater channel, the value of transmit power and sound level is obtained at -10 dBm and 86.6 dBA.

Automated summary

Through research on Underwater Visible Light Technology Communication (UVLC), it was found to have advantages of high propagation distance and high data rate. In the experiment, the combination of LED light source and photodiode performed stably, indicating good communication performance in both indoor and underwater environments.