Telefonaktiebolaget Lm Ericsson (publ)

Michael Lee Sundheimer

Walter Margulis

Anderson Stevens Leonidas Gomes

Joaquim Ferreira Martins-Filho

Carmelo José Albanez Bastos-Filho

Mariana Torres Carvalho

An arrangement and method provide an optical thulium doped fiber amplifier utilizing a dual wavelength pumping scheme for amplifying an optical signal. The method includes the steps of: a first deposition (a) of energy into the fiber amplifier by pumping with radiation of a first wavelength; and a second deposition (b) of energy into the fiber amplifier by pumping with radiation of a second wavelength. The radiation of the first wavelength is arranged to induce, by single photon absorption, a population to theHlevel of the thulium dopant, and the radiation of the second wavelength primarily depopulates theFlevel, by excited absorption of a single photon, preferably by strong excited state absorption to theFlevel. The steps gives a population inversion between theHand theFlevels and facilitate a power efficient high gain amplification.

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Recife-PE, Brazil

Michael Lee Sundheimer