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We present a novel approach to underwater fleet communication using single-photon avalanche diode (SPAD) arrays on the receiver. Using a large array and a focusing lens, the array can be spatially allocated to different sectors within the lens’s field of view. This eliminates the need for precise pointing of the receiver towards the transmitter and enables simultaneous reception of multiple transmitters across the entire array. We demonstrate the feasibility of our approach through a prototype receiver that utilizes a 7x7 SPAD array, a wide field-of-view lens and FPGA processing. We were able to achieve a raw data rate of 6 Mbps across a folded 25m clear water channel. Through the use of artificial attenuation with ND filters, we estimate that the achievable distance for a raw data rate of 6 Mbps in clear water with a BER of 10-3 is approximately 400m. In over-the-air testing, we were able to achieve simultaneous communication over the entire 7x7 array at 6 Mbps.
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