Abstract
High-aperture single-mode fibers with GeO2 concentrations of 10–30 mol. % have many applications; for example, they are used as dispersion-compensating fibers and as active fibers for signal amplification and they are a very attractive medium for various efficient nonlinear effects. However, to make best use of the advantages of highly doped fibers, the higher optical losses of such fibers should be minimized to improve their performance. In spite of several investigations, a satisfactory loss level in high-aperture fibers has not been reached to date and the mechanisms responsible for their excess losses are not yet clear.1–4
© 1995 Optical Society of America
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