Modeling and optimization of short Yb3+-sensitized Er3+-doped fiber amplifiers |
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Authors: | Nilsson J. Scheer P. Jaskorzynska B. |
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Affiliation: | Dept. of Phys. II, R. Inst. of Technol., Stockholm ; |
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Abstract: | Short high-concentration Yb3+-sensitized Er3+-doped fiber amplifiers are modeled and numerically investigated in the small-signal domain. Concentration quenching is included with a term quadratic in the concentration of excited Er3+ . We find that for fibers shorter than 1 m, the small-signal gain can be larger for sensitized fibers than for non-sensitized ones (31 dB gain vs. 22 dB at 5 cm). Without concentration quenching (e.g. for long fibers), Yb3+-free amplifiers have a higher small-signal gain. The achievable gain of the sensitized amplifier is independent of the pump laser wavelength, if the Yb-concentration is correspondingly optimized. However, restrictions on allowable Yb-concentrations imply that for a specific pump wavelength, a finite range of amplifiers lengths is suitable |
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