Spectrum Properties of Erbium with Other Rare-Earth Ions Co-Doped Optical Fiber

Erbium doped fiber amplifier is demonstrated at several wavelengths. The exceptionally broad and intense absorption spectrum of erbium with other rare-earth co-doped fiber is advantage in high power amplifiers and fiber lasers. In order to broad amplifying band, it is important to modify spectrum properties of erbium-doped optical fiber. In this dissertation, erbium with ytterbium, thulium and Lanthanum co-doped fibers are fabricated by MCVD. This paper focuses on the influence of concentration and ratio of rare-earth on spectrum properties of fiber. It is found that absorption of the EDFs is affected by erbium concentration and ratio of erbium and other rare-earth. Absorption band is broadened by adding dopant of other rare-earth.