Modeling and design of soliton propagation in WDM optical systems

In the 5G mobile networks, the optical signal transmission will be widely used. Two main applications are important: short links for the access networks and long links in the backbone of the system. In this paper we investigate both applications. For that purpose we developed a method using simulations. Based on our simulation results we present proper methods to avoid distortion, which is caused by interaction between the solitons. Considering the dispersion and nonlinearity of the widely used fibers two different methods can be applied to avoid distortion. In short links (3-5 km long) we don't need special compensation methods to avoid interaction between neighbouring solutions. In this case a proper precaution is adequate which means that the 3 dB time duration of the soliton pulse has to be less than the half of the bit time frame. However, in long links (e.g. 100 km long) proper correction procedures are needed not to get collision of solitons. For long links shifted filtering can provide sufficient result. Besides utilizing the advantages of signal transmission by solitons in a single channel, our investigation covers the wavelength division multiplex (WDM) connections as well, which can provide much higher transmission capacity.