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

Abstract:

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 2πX 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. Supported by the National Natural Science Fund of China under contact No. 60377031 and No. 60577013, National Basic Research Program of China under contact No. 2003CB314907