Theoretical Analyses of the Compensation Method of PDL at the Transmitter

We proposed a theoretical PDL compensation scheme which can achieve perfect compensation based on the real-time channel information. It is suggested that PDL must compensated at the transmitter.

I. Introduction

With the widely deployment of the dense wavelength division multiplexing (DWDM) system, the wavelength selection switch (WSS), which caused large polarization dependent loss (PDL), is widely introduced in the polarization division multiplexing (PDM) systems. PDL leads to communication system optical signal-to-noise ratio (OSNR) penalty and there is no feasible solution to compensate for or mitigate the PDL effect, resulting in PDL becoming one of the major factors affecting the performance of PDM systems.