Both CD and PMD compensation using nonlinearly chirped fiber Bragg gratings

Experimental research of simultaneous tunable CD and adaptive PMD compensations in optical fiber communication system is reported for the first time. Two different nonlinearly chirped fiber Bragg gratings fabricated through the equivalent chirp technology was applied in realizing the novel experiment. One of nonlinearly chirped fiber Bragg grating was used as CD compensator, with a tunable dispersion range from 300ps/nm to 600 ps/nm. The other made of photosensitive polarization maintaining fiber was used as a tunable delay line of PMD compensator, which provided a varying amount of DGD from 40ps to 110ps. Our experiment was operated at 10Gbit/s NRZ system and the resultes show that the eye pattern recovery is very excellent after both PNM and CD compensated. Especially, power penalty at a BER of 10(-9) is about 1 dB.