Polarization-related impairments have become a critical issue for high-data-rate optical systems, particularly when considering polarization-mode dispersion (PMD). Consequently, compensation of PMD, especially for the first-order PMD is necessary to maintain adequate performance in long-haul systems at a high bit rate of 10 Gb/s or beyond. In this paper, we successfully demonstrated automatic and tunable compensation for first-order polarization-mode dispersion. Furthermore, we reported the statistical assessment of this tunable compensator at 10 Gbit/s. Experimental results, including bit error rate measurements, are successfully compared with theory, therefore demonstrating the compensator efficiency at 10 Gbit/s. The first-order PMD was max 274 ps before PMD compensation, and it was lower than 7ps after PMD compensation.
In this paper, we present and design a new type of tunable filter. The polymer with high electro-optic (EO) coefficient is fabricated as the outer layer of the long period fiber grating (LPG), since the resonant wavelength of LPG is extremely sensitive to the refractive index change outside the cladding, it is possible to achieve very fast speed broad tuning of wavelength by slightly tuning the refractive index of the surround area through the fast speed EO effect.
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