Abstract
It is argued that the form of dark solitary wave solution [∼tanh p(z − υgt)] previously predicted is highly questionable because the radial dependence of the field was not properly treated. In this Letter a previously developed method for exactly treating the radial dependence of the field is extended to dark-pulse wave solutions, and a new class of solutions is presented that exists in the anomalous dispersion region of the fiber. The average intensity for these solutions exhibits a double hump, in contrast to the single hump associated with the bright-pulse wave.
© 1984 Optical Society of America
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