Tunable chromatic dispersion compensating in 40-Gbit/s system by an enhanced thermal chirping fiber Bragg grating

In this letter, a tunable chromatic dispersion compensating in 40Gbit/s system based on enhanced thermal chirping fiber Bragg grating is demonstrated. The dynamic dispersion is provided by a tunable dispersion compensator based on enhanced thermal chirping fiber Bragg grating, which can change the group velocity delay (GVD) without changing the center wavelength or change the center wavelength with a fixed group velocity delay (GVD).