Abstract
Summary form only given. Polarization mode dispersion (PMD) is considered to be one of the main obstacles for deploying high-speed optical communication systems operating at 40-Gb/s per channel and higher. For system with larger PMD, some PMD mitigation techniques have to be used. PMD mitigation techniques can be divided into three main approaches: (i) passive mitigation techniques, (ii) electrical PMD compensation, and (iii) optical PMD compensation. Except the passive ones, most PMD mitigation techniques are channel based, which means that each channel in a WDM system requires a separate PMD compensator. This is very cost ineffective. Recently, some ideas of multi-channel PMD compensators were proposed, including channel switching and some PMD compensator sharing techniques.
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