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Backscatter suppression for underwater modulating retroreflector links using polarization discrimination.

Linda Mullen¹, Brandon Cochenour, William Rabinovich

¹Naval Air Systems Command, NAVAIR, Electro-Optics and Special Mission Sensors Division, 22347 Cedar Point Road, Patuxent River, Maryland 20670, USA. linda.mullen@navy.mil

|January 13, 2009

Summary

Underwater free space optical links offer high-bandwidth, low-detection data transmission. This study addresses challenges in aquatic environments for modulating retroreflectors, optimizing link performance.

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Area of Science:

Optical engineering
Underwater communication systems
Data transmission technologies

Background:

Free space optical (FSO) links offer high-bandwidth, low-probability-of-detection data transmission.
Retroreflecting FSO links reduce power and weight burdens, with successful above-water implementations.
The underwater environment presents unique challenges for FSO link performance.

Purpose of the Study:

To investigate challenges specific to underwater free space optical links.
To explore techniques for mitigating the impact of the underwater environment on link performance.
To optimize the performance of retroreflecting FSO links in aquatic settings.

Main Methods:

Analysis of environmental factors affecting underwater optical signal propagation.
Development and testing of modulation techniques for retroreflectors in water.
Performance evaluation of underwater FSO links under various conditions.

Main Results:

Identification of key challenges including turbidity, scattering, and absorption.
Demonstration of techniques to improve signal integrity and link stability.
Quantification of performance improvements for underwater retroreflecting links.

Conclusions:

Underwater FSO links are feasible for short-range, high-bandwidth communication.
Modulating retroreflectors can be adapted for underwater use with appropriate techniques.
Further research can enhance the reliability and range of these systems.