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Effective Raman gain characteristics in germanium- and fluorine-doped optical fibers
Authors:Fukai Chisato  Nakajima Kazuhide  Zhou Jian  Tajima Katsusuke  Kurokawa Kenji  Sankawa Izumi
Institution:NTT Access Network Service Systems Laboratories, 1-7-1, Hanabatake, Tsukuba, Ibaraki 305-0805, Japan. chisato@ansl.ntt.co.jp
Abstract:We describe the dopant dependence of Raman gain in germanium- and fluorine-doped optical fibers. We clarify, both theoretically and experimentally, the effective Raman gain characteristic in an optical fiber, which is closely related to the fiber's refractive-index profile and electromagnetic field profile. We also show that this experimentally determined relationship can be used to evaluate the effective Raman gain characteristic in a germaninum- or a fluorine-doped optical fiber with an arbitrary index profile.
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