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Signal amplification in strongly pumped fiber amplifiers

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2 Author(s)
Hardy, Amos ; Fac. of Eng., Tel Aviv Univ., Israel ; Oron, R.

Signal amplification is analyzed in strongly pumped fiber amplifiers both for three-level and four-level transitions, including scattering loss and excited state absorption. Simple analytic expressions are derived for the signal amplification and pump attenuation, along the fiber length, when either the signal and the pump are injected at the same fiber end (forward pumping) or when they are injected at the two opposite ends (backward pumping). Numerical examples for rare-earth doped fibers show excellent agreement between the analytical solution and the exact numerical solutions of the rate-equations for practical operating conditions

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Quantum Electronics, IEEE Journal of  (Volume:33 ,  Issue: 3 )