Effective factors of CD monitoring technique based on the narrow-band electrical power detection

摘要

Chromatic Dispersion (CD) monitoring technique based on narrow-band electrical power detecting is one of the cost-effective and simple CD monitoring techniques,while the performance of this method is debased by factors such as bandwidth and center frequency of the detected frequency band,self-phase modulation (SPM),light source chirps and optical fiber losses.The CD-electrical power curve is simulated to investigate the effects of the factors above mentioned.Theoretical analysis shows that in single-channeled fiber link,the effect of SPM is small enough (0.003%) to be ignored,while the chirps and the losses must be taken into account;the bandwidth of the detected frequency band would better be less than 2π×1 GHz;the selected central frequency is related to the shape of the original pulse,a central frequency of 12 GHz is chosen in a 40 Gbit/s system,and 5GHz is chosen in a 10 Gbit/s system.A testing system is established.The experimental results agree well with the theoretical analysis.