Optischer breitbandiger Tellurit-Faserverstärker mit Multiwellenlängen-Pumpquelle

摘要

This invention relates to an optical fiber amplifier and the following four structures of attaining a flat gain spectrum over a wide wavelength region. The first structure relates to a Raman amplifier where a tellurite fiber (1) is pumped with two wavelengths (< lambda >1, < lambda >2) having a predetermined difference. The second structure relates to a Raman amplifier or an optical communication system employing a tellurite fiber (1) and a silica fiber (11). The third structure relates to an optical fiber amplifier employing an Erbium-doped tellurite fiber (21) of which Erbium concentration is low. The fourth structure relates to an optical fiber amplifier employing a rare-earth doped fiber such as the Erbium-doped fiber (21) and a tellurite fiber (1).