An Information-Feedback Approach Applied to Polarization-Modulated Laser Communication Systems

The use of an information-feedback procedure, called "feedback averaging," is applied to an
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-ary polarization-modulated laser communication system. The systems with and without feedback, which are limited by photon fluctuation, are considered and compared. A significant improvement in error rate of a system with feedback is demonstrated over a one-way system for a quarternary system subject to intensity constraint.