Abstract
We have developed a coupled mode analysis for an erbium-doped coaxial fiber (EDCF) with doping only in the inner rod. With this analysis, the gain characteristics of the EDCF can be obtained in terms of the gain characteristics of a conventional single-core erbium-doped fiber. We have illustrated the use of this method in studying an EDCF and shown its application for inherent gain flattening.
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