| Since the end of the 20th century, optical fiber communications and the Internet have become two of the world's fastest growing technologies, the most promising fields in market. The IP over Optical technology which combines both of them now becomes the main transmission technology of the backbone optical transmission network and is very promising. IP over Optical technology is to map the IP packets directly onto the optical networks through GMPLS (General Multi-Protocol Label Switch). The optical network is based on WDM. The network load is paroxysmal, and is bound to affect the transmission performance of its optical network.Starting with the Nonlinear Schrodinger Equation (NLSE), we research the effects of network load on the optical pulse transmission in this paper. A simplified method is used in the solution of the multi-channel NLSE, and the burst traffic load model obeying Poisson distribution is involved in solving the equation. We research the networks'load effects of FWM and XPM on the transmission performance of the optical pulses. Through simulation and analyzing the eye diagram, we get the impact of network load on the transmission performance of optical networks. In additional, based on the formula for calculating the bit error rate, we research the intensity noise caused by XPM and bit error rate in the IM-DD system, and the FWM effect in the dynamic optical networks. Through analysis we find that when the input light power of each signal channel is less than 0 dBm, networks'load effects on FWM and the eye diagram is small, but when the input optical power is more than 5 dBm, network load has great effect on the FWM and results in the deterioration of eye diagram. And according to numerical calculation of the formula, we find that FWM is proportional to cube of the network load, and the XPM effect induced by the 8 channels near the probe channel is obvious, while the effect induced by other channels could be ignored. |
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