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In 40 Gb/s systems with low polarization-mode dispersion(PMD) fibers,first-order PMD is the dominate factor with quite small value. An adaptive PMD compensator consisting of an electrical polarization controller(PC) ,a section of polariza-tion maintaining fiber(PMF) ,a degree of polarization(DOP) detector and a feedback control module is employed in 40 Gb/s NSFCNet. This compensator has a simple structure and high speed,which can compensate up to 20 ps first-order PMD adaptively and the average searching time is 2 ms.
An adaptive PMD compensator consisting of an electrical polarization controller (PC), a section of polariza- tion (PMD) fibers, first-order PMD is the dominate factor with quite small value (PMF), a degree of polarization (DOP) detector and a feedback control module is employed in 40 Gb / s NSFCNet. This compensator has a simple structure and high speed, which can compensate up to 20 ps first-order PMD adaptively and the average searching time is 2 ms.