Abstract
The inevitable variation of amplifier gain with wavelength presents a problem for WDM, one which becomes ever more serious with increasing system length. In linear transmission (such as “NRZ”), where no self-stabilization of the channel energies is possible, the channels energy difference increases exponentially with distance. As we show in this paper, for soliton transmission using sliding frequency guiding filters [1], negative feedback provided by the filters locks the energies of individual soliton channels to values that do not change with distance, even in the face of considerable variation in amplifier gain among the different channels. The equilibrium values of the energies are further largely independent of input levels, and tend to vary only in proportion to the fiber’s dispersion. This effective, yet passive regulation is very important for long-distance transmission and for networking applications.
© 1996 Optical Society of America
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