KEYWORDS: Polarization, Signal to noise ratio, Digital signal processing, Transmittance, Multiplexing, Signal attenuation, Receivers, Binary data, Transmitters, Signal processing
The performance of Pol-Mux systems is limited by polarization dependent loss (PDL) which mainly exist in the passive components and optical nodes. In coherent systems, the function of PDL mitigation to increase the transmission distance of polarization multiplexed signal is essential for the digital signal processing (DSP) technology. Several precoding technologies have been investigated with the capability of suppressing PDL penalty in a blind manner, so that the monitoring technology is not required. Space-time code is one of the precoding technologies with low processing complexity and better performance. An inverse matrix method was also investigated basing on the Mueller matrix monitor. The experimental demonstration showed good improvement by this method. In this paper, the PDL monitoring and the mitigation technologies will be summarized and well explained in theory.
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