Fig. 4: Experiments of the wireless transmission across underwater turbulence channel.
From: Wireless microwave-to-optical conversion via programmable metasurface without DC supply
a Photograph of the experimental setup, in which tap water is first injected into the water tank, and then hot water is injected into it from the top to bottom to generate temperature-induced turbulence. b For the case that one photodiode is illuminated, strong turbulence will cause the laser beam diffusion and drift, which will reduce the transmission quality of the link. c The link can provide relatively stable data transmission when two photodiodes are illuminated simultaneously, even though one laser beam is in outage, the other can still ensure reliable operation.
