By incorporating an isolator at an appropriate location, it isshown that it is possible to realize an efficient single-passsuperfluorescent-doped fiber source with a major fraction of itsemitted power in the forward direction. A theoretical model toestimate the performance of such a superfluorescent source (SFS) hasbeen suggested and verified with experiments performed on anerbium-doped fiber in a novel pump bypass SFS configuration. Resultson design issues such as optimum location of the isolator, pump powerrequire- ments, and spectral characteristics are also presented.
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