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By using two-section fiber where the first section has no spin and the second one is periodically spun, we demonstrate reduced polarization dependent gain and polarization mode dispersion in a distributed fiber Raman amplifier.
We exploit the polarization dependence of the Raman amplification to obtain a polarization pulling effect in telecommunication optical fibers. Experiments carried out with 1571 nm signal and copropagating high-power 1486 nm pump evidence the polarization pulling.
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