Abstract
Current high-capacity and long-reach optical fiber links would not be
possible without optical amplification. Especially the use of erbium-doped
fiber amplifiers (EDFAs) has revolutionized optical communication systems
during the last two decades. Although the amplification process and various
effects occurring in rare earth doped amplifiers have been already well understood
and accurately modeled, evolution of thermodynamic entropy and other thermodynamic
aspects have not been sufficiently considered in the past. This paper analyzes
the amplification process in EDFA from the thermodynamic point of view and
proposes a novel modeling approach to evaluate both energy and entropy dynamics.
The model is described in detail and some exemplary numerical results are
presented.
© 2012 IEEE
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