Signal amplification in strongly pumped fiber amplifiers

Amos Hardy*, R. Oron

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

131 Scopus citations


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.

Original languageEnglish
Pages (from-to)307-313
Number of pages7
JournalIEEE Journal of Quantum Electronics
Issue number3
StatePublished - Mar 1997


FundersFunder number
Israeli Ministry of Science and Art


    • Laser amplifiers
    • Optical amplifiers
    • Optical fiber amplifiers
    • Optical fibers


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