Abstract:

Based on the good relation of degree of polarization (DOP) of feed-back signals and differential group delay (DGD), DOP was extracted as monitor signal to find out the maximum DOP of fiber link with the aid of controlling algorithm to control compensators to obtain optimal compensation. Chirped fiber grating made of photosensitive polarization maintaining fiber was fabricated through the equivalent chirp technology, which was used as time delay line of PMD compensator. The experimental study of adaptive polarization mode dispersion (PMD) compensation in the 10 Gbit/s nonreturn-to-zero(NRZ) transmission system was reported. Meanwhile, a particle swarm optimization (PSO) technique into automatic PMD compensation was used. PSO has the characteristics of converging for global optimum rapidly and avoiding for being trapped into local sub-optima and robust to noise. The experiments show that the adaptive PMD compensation system on which chirped fiber gratings are used as compensators woks very well.

Key words: optical fiber communication, chirped fiber grating, polarization mode dispersion compensation, degree of polarization