Study On Using The Wavelength Conversion Technology To Eliminate Raman Crosstalk In DWDM Systems

With the development of science and technology, communication services have an explosive growth, and promoting the communication has developed rapidly. New communication technologies have appeared constantly. The fiber communication has become the development trend of the communication technology by lower transmission loss, greater transmission capacity, longer transmission distance, stronger anti-interference performance and richer raw materials, in this process, the dense wavelength division multiplexing (DWDM) technology came into being.DWDM technology can transmit multi-channel optical signals of different wavelengths in the same fiber, and the double or even one hundred times to expand the capacity of communication system. But, with the increasing number of multiplexed channels and the total transmission power, the nonlinear effects can be ignored in the channel less Numbers of WDM system, has become the main factors influencing the performances of DWDM optical fiber communication system. Stimulated Raman scattering (SRS) effect in optical fiber communication system performance which is a kind of serious nonlinear effect, SRS effect can make transfer of power during transmission, and causing the receiver error rate increases, seriously degrade the performance of the communication system. So, it has important theoretical and practical significance to improve the performance and capacity of optical fiber communication system which research on how to eliminate the stimulated Raman scattering in optical fiber transmission.Based on extensive summary and the results of previous studies, under the model in the steady state and transient model, this paper analysis a magnification which uses of Raman wavelength conversion technology eliminates crosstalk when needed and gives the output power after wavelength conversion of each channel when channel spacing and input power is arbitrary. Through the numerical simulation:at any position in the transmission process, when the signal is amplification with calculated according to the theory of magnification, we can get the signal which is not affected by SRS effect in the corresponding position.At the same time, by using the model of’Time-domain step’, this paper analysis Raman wavelength conversion technology eliminates crosstalk effects when the dispersion exists. Get a conclusion that in the presence of dispersion, the wavelength conversion technology won’t completely eliminate the influence of Raman crosstalk, but can abate Raman crosstalk, improve the performance of communication system.