Soliton system evaluations using fibers with dispersion and loss fluctuations

In the development of practical multimedia systems, greater capacity is desired in a long‐distance large‐capacity transmission system. A number of studies have been undertaken to develop a long‐distance large‐capacity system. Several long‐distance transmission experiments for high‐density transmission by wavelength demultiplexing method (WDM) have been reported recently. However, more of the experimental examples have reported on soliton transmission than on WDM systems. Hence, the former is considered more advanced. It is necessary to prepare a fiber of a length of approximately 10, 000 km for ultralong‐distance transmission experiment. Since this is difficult to obtain, repetitive experiments are often the case. However, such an experiment does not disclose the effects of dispersion and loss fluctuation in the fiber. In this paper, the effect of fluctuation in dispersion and loss in the fiber is studied by simulation so that the resilience of the soliton to the variations of the fiber characteristics is evaluated.