Abstract

A new type of optical fiber amplifier well suited for multiwavelength long-distance transmission systems is presented. In such applications, optical amplifiers must provide equal gain and noise for each wavelength. Usually in fluoride fiber-based amplifiers a gain decrease for the shortest transmitted wavelengths is observed. This gain decrease is enhanced when such amplifiers are cascaded. A fiber amplifier made of butt-jointed silica and fluoride erbium-doped fibers was studied. The influence of the erbium-doped silica fiber on the amplified spontaneous emission spectrum of this ‘hybrid’ amplifier was observed. This new amplifier has been cascaded with a fluoride fiber amplifier in a multiwavelength transmission system (with wavelengths ranging from 1533 to 1557 nm). Various optical spectra at the output of the amplifiers are presented and compared with standard fluoride fiber amplifiers.

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