Higher order polarization mode dispersion compensation using a fixed time delay followed by a variable time delay

We propose and analyze a higher order polarization mode dispersion (PMD) co mpensator using a fixed differential group delay (DGD) section followed by a variable section. The performance limits of various PMD compensators are quantified and Compared using dynamic PMD tracking. Compared with existing compensators with a single fixed DGD, the proposed compensator improves an nonreturn-to-zero 10-Gb/s link tolerance to average PMD from 28 to 44 ps, A lternatively, the tolerance increases to only 36 ps using a compensator wit h two fixed-DGD sections.