Influence of nonideal chirped fiber grating characteristics on ultra long haul transmission system

Group velocity delay ripple (GDR) and reflectivity ripple (RR) are the main nonideal characteristics for chirped Bragg fiber grating (CFBG). The influence of these nonideal characteristics on the CFBG-based transmission systems with carrier suppressed return-to-zero (CSRZ) format was investigated, and the performance of the transmission system was evaluated by the eye opening penalty (EOP) in this paper. In additional, the impact of the phase difference between the central wavelength of the transmitted signal and the GDR on the transmission system which make the transmission performance fluctuate randomly was also studied. The analysis helps to conduct a practical 10Gb/s 2560km error-free transmission experiment in straight line with low power penalty, and no electronics regenerator and forward error correction (FEC) were employed in this system. The experiment result is so attractive in long haul transmission field.