Transmission performance analysis of WDM systems based on bismuth-doped phosphate glass fiber amplifiers

In this paper transmission performance of Allwave fiber WDM systems cascaded by bismuth-doped phosphate glass fiber amplifiers pumped by 808 nm lasers is analyzed for the first time, to the best of our knowledge. The rate and power propagation equations of a three-level system are used to model the signal amplification and noise figure in the doped fibers. The simulation results show that the channels in the 1460-1470 nm wavelength region in 32 × 40 Gbit/s WDM system with 10 nm channel space can reach a BER less than 1 × 10−9 with the transmission distance more than 600 km, but when the channel space is reduced to 1 nm, the performance of the system is degraded greatly.