Abstract
Polarization fluctuations are one of the obstacles in coherent fiber-optical transmission systems. Active polarization control is the most favorable method of matching the polarization of both the signal from the transmitter and the local oscillator. The author presents a new endless control scheme which makes reset procedures of finite range polarization controlling devices obsolete. The principal idea is to maximize the mean-square distance between the retarder drive signals and their physical limits in each operation step. Consequently, the drive signals are smoothly decreased to their center retardation when they approach the outer boundaries of their physical range. Calculations proved the worst-case receiver sensitivity degradation to be less than 0.2 dB, owing to SOP-mismatch. In most cases, the resulting degradation is less than 0.1 dB, corresponding to an error angle of about 3 degree(s) in Poincare- sphere representation.
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