Design and modelling of saturated erbium-doped fiber amplifiers

TitleDesign and modelling of saturated erbium-doped fiber amplifiers
Publication TypeConference Paper
Year of Publication1999
AuthorsMovassaghi, M., and M. K. Jackson
Conference NameNanostructures and Quantum Dots/WDM Components/VCSELs and Microcavaties/RF Photonics for CATV and HFC Systems, 1999 Digest of the LEOS Summer Topical Meetings
PaginationIV21 -IV22
KeywordsASE, design, erbium, erbium confinement effect, excited state population, gain, laser noise, mode envelopes, modelling, noise figure, optical communication equipment, optical fibre amplifiers, optical pumping, optical saturation, saturated erbium-doped fiber amplifiers, signal saturated regime, simplified rate equation

Erbium doped fiber amplifiers operating in signal saturated regime have become the key components of the rapidly growing WDM and cable TV optical communication systems. Therefore efficient design and accurate modeling of gain and NF in saturated EDFAs is of prime importance. It is generally believed that for achieving efficient EDFAs, the erbium doping inside the fiber should be confined, Although this is true for amplifiers operating in small signal regime, we show that for the case of saturated EDFAs optimum design is achieved when erbium is not confined and distributed over the entire fiber core. Another issue is the modeling of these non-confined EDFAs. The existing steady state EDFA models can be categorized into two major groups. First are the so-called general models which include the radial optical and erbium distributions: however these models are not very practical as they include many parameters some of which are difficult to measure accurately. Second are the simplified models of Giles [1991] and Saleh [1991] which are based on the effective overlap integral and provide a more practical way in modeling EDFAs; however, both of the models are derived based on the assumption that the erbium is confined inside the fiber core and as a result cannot accurately predict the performance of nonconfined EDFAs. In this paper we present a model which can closely predict the gain and NF of saturated EDFAs irrespective of the erbium confinement


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