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High-concentration Er/sup 3+//Yb/sup 3+/ codoped glass waveguide amplifiers are analyzed by means of a finite-element-based code. Efficient Yb/sup 3+/ to Er/sup 3+/ energy transfer is shown to be a useful mechanism to reduce performance degradation due to Er/sup 3+/ ion-ion interactions. Numerical calculations based on realistic waveguide parameters demonstrate the possibility of achieving high gain with a short device length.>
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Pasquale et al. (1994) studied this question.
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