The breakthrough technology in dry fiber fabrication has opened the possibility for using fiber bandwidths all the way from 1.3 to 1.6£gm. However, the fiber amplifier used in commercial product, such as erbium-doped fiber amplifier (EDFA), can not fully cover the whole fiber bandwidths from 1.3 to 1.6£gm with a single fiber amplifier. Recently, the Cr4+-doped fiber has shown a broadband emission from 1.3 to 1.6£gm. Therefore, it is interesting to develop a single fiber amplifier which can operate the wide bandwidth of the 1.3~1.6£gm emission. In this study, we have successfully fabricated and measured the Cr-doped fibers by using a commercial drawing-tower technique and a rod-in-tube method. The core diameters were 26 and 16£gm. The Cr4+ fluorescence spectrum showed a broadband emission from 1.2 to 1.6£gm. The radiation intensity was up to the order of nW. This indicates that the new Cr-doped fibers may be used as a broadband fiber amplifier. The advantages of using the drawing tower to fabricate the Cr-doped fibers are to have a better control of the core diameter, the fiber uniformity and circularity. Therefore, the Cr-doped fibers may have a potential for commercial production and application to lightwave communication systems.

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