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We report a feed-forward polarization-mode dispersion (PMD) compensator with four fixed differential group delay elements, which is capable of compensating for any first- and second-order PMD in a transmission fiber. The compensator consists of seven control parameters [or seven degrees of freedom (DOF)]. An extra DOF is employed to ensure analytical solutions of control parameters for the case of random changes of PMD vectors. Our model shows excellent robustness to possible perturbations by Monte Carlo simulations.
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Miao et al. (2004) studied this question.
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