Linear optoacoustic underwater communication.

Area of Science:

• Acoustics
• Optics
• Communications Engineering

Background:

• Underwater communication is vital for submarines and unmanned undersea vehicles.
• Traditional acoustic methods face limitations in range and bandwidth.
• Optoacoustic communication offers a potential alternative for air-to-water data transmission.

Purpose of the Study:

• To investigate the linear optoacoustic mechanism for air-to-water communication.
• To assess achievable communication ranges for submerged platforms.
• To develop and evaluate a practical linear-regime optoacoustic communication scheme.

Main Methods:

• Experimental generation of underwater acoustic signals using linear optoacoustic conversion.
• Simulation of optoacoustic communication based on theoretical models.
• Analysis of oblique laser incidence effects on air-water interface communication range.
• Optimization of optical wavelength and signaling frequency for sound generation.
• Comparison of M-ary frequency shift keying and multifrequency shift keying techniques.

Main Results:

• Conventional underwater acoustic signals were successfully generated via linear optoacoustic conversion, matching simulation predictions.
• Oblique laser incidence was shown to influence both in-air and in-water communication ranges.
• Optimized optoacoustic sound generation techniques were identified for enhanced range.
• M-ary FSK and multifrequency shift keying demonstrated trade-offs in bandwidth, data rate, and range.

Conclusions:

• Linear optoacoustic communication is a viable method for transmitting conventional acoustic signals from air to submerged platforms.
• Oblique laser incidence and optimized signal generation are key factors for maximizing communication range.
• The study provides a framework for practical optoacoustic communication systems, with M-ary FSK and multifrequency shift keying offering different performance characteristics.