Physics Colloquium: AmphiLight: Direct Air-Water Communication with Laser Light

Charlie Carver, FCRH’2018, of Dartmouth College, will present the “AmphiLight: Direct Air-Water Communication with Laser Light” lecture. Air-water communication is fundamental for efficient underwater operations, such as environmental monitoring, surveying, or coordinating heterogeneous aerial and underwater systems. Existing wireless techniques mostly focus on a single physical medium and fall short in achieving high-bandwidth bidirectional communication across the air-water interface. We propose a bidirectional, direct air-water wireless communication link based on laser light, capable of (1) adapting to water dynamics with ultrasonic sensing and (2) steering within a full 3D hemisphere using only a MEMS mirror and passive optical elements. In real-world experiments, our system achieves static throughputs up to 5.04 Mbps, zero-BER transmission ranges up to 6.1m in strong ambient light conditions, and connection time improvements between 47.1 percent and 29.5 percent during wave dynamics.