Real-Time Wave Mitigation for Water-Air OWC Systems Via Beam Tracking

TL;DR

This paper demonstrates a real-time beam tracking system that significantly improves water-air optical wireless communication performance by compensating for wave-induced beam deflections, achieving up to 486% throughput enhancement and reducing packet loss.

Contribution

The study introduces an experimental beam tracking method for water-air OWC systems that effectively mitigates wave-induced beam deflections, enhancing communication reliability and speed.

Findings

Up to 486% throughput improvement with beam tracking.

Packet loss reduced from 75% to 11%.

Maximum throughput of 1.25 Gb/s achieved.

Abstract

In a water-air optical wireless communication (OWC) channel, dynamic ocean waves may significantly deflect the light beam from its original direction, thus deteriorating the communication performance. In this letter, a beam tracking system to mitigate wave-induced communication degradation is experimentally demonstrated. By employing the beam tracking on the PAM6 system, a maximum of 486% improvement (from 140 Mb/s to 820 Mb/s) in throughput is realized at a 1.2-m air distance for an average wave slope changing rate of 0.34 rad/s. For PAM4 signals, the packet loss rate reduces significantly from 75% to 11%, and a maximum throughput of 1.25 Gb/s is achieved.