Abstract
Polarization mode dispersion (PMD) is becoming major system impairment in high speed and long distance optical fiber transmission systems. As the bit rate climbs from 10 to 40Gb/s per channel and beyond, optical pulses are increasingly distorted by 1st and higher order PMD. We report on the experimental mitigation of pulse distortion due to 1st and higher order PMD effect based on one tunable differential group delay (DGD) element, which is a compact concatenation via six magneto-optic polarization rotators (Faraday rotators) of six YVO<sub>4</sub> birefringence crystals whose lengths decrease in a binary power series. Two different experiments are carried out, with and without an electric polarization controller set before the tunable DGD element. Optical pulses with width of 41ps are broadened and distorted by the PMD emulator which generates 1st and 2nd order PMD with mean magnitude of 30.28 ps and 483.31 ps<sup>2</sup>, respectively, and then reshaped by the compensation device. Degree of polarization (DOP) is used as the feedback signal, which is significantly increased from around 0.15 to around 0.85. The experiment results show that pulse distortion due to 1st and higher order PMD is successfully mitigated.
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