One attractive feature of the all-optical approach to ultralong distance transmission is that it greatly facilitates wavelength division multiplexing (WDM). For most transmission modes, however, nonlinear interactions tend to cause severe interchannel interference.1,2 On the other hand, in a fiber with uniformly canceled loss (distributed amplification), it is well known that solitons of different velocities (different wavelengths) are transparent to each other.3 We have shown, through numerical simulation, that transparency is also maintained in a system using lumped amplifiers as long as the length of the collision (the distance the solitons travel down the fiber while passing through each other) is ~2 or more times greater than the spacing between amplifiers. Our result implies the potential for at least several multi-Gbit/s WDM channels spanning just 1 or 2 nm in a system of transoceanic length (6000-8000 km).

© 1990 Optical Society of America

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