Amplification Reduction in Fiber Amplifiers Due to Up-Conversion at Er3(+)+-Concentrations Below 1000 ppm,
ROYAL INST OF TECH STOCKHOLM (SWEDEN)
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One of the key parameters for optimizing erbium-doped fiber amplifiers EDFAs is the Er3 -concentration profile. Below the concentration for onset of component clustering, up-conversion may play a significant role 1. Recent experiments have shown that up-conversion is a considerable deteriorating mechanism even below an erbium concentration of 1000 ppm by weight 2,3. In this paper, we have made an extensive study of eight different fibers in order to examine the up-conversion as a function of erbium concentration below 1000 ppm by weight. From these experiments and a computer model of up-conversion, we have been able to estimate the up-conversion coefficient used in our rate-equation model. These results are necessary for accurately modelling EDFAs with erbium concentrations down to approximately 100 ppm by weight and for erbium profile optimizations.
- Electrical and Electronic Equipment
- Fiber Optics and Integrated Optics