Abstract
A rate-equations model that takes into account the energy transfer between and as well as clustering, is employed to analyze the power conversion efficiency (PCE) of high-power, gain-flattened, -codoped fiber amplifiers (EYDFA). Numerical results for C-band EYDFA and L-band EYDFA show that the PCE strongly depends on the excess pump losses and on the pump-band amplified spontaneous emission (ASE). It is found that the L-band EYDFA is more efficient in the limit of strong injected signal powers and large cladding areas. It is also shown that the PCE significantly improves on increasing the concentration in the C-band EYDFA, whereas in the L-band EYDFA it mainly depends on the pump wavelength. The effect of clusters on the PCE is discussed.
© 2003 Optical Society of America
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