Abstract

High Attenuation Fibers (HAF) are used in telecommunications networks to attenuate signals^1,2 or to eliminate end-of-line reflections. In the latter case, one usually refers to terminators. These types of fibers contain dopants in their cores, usually transition metal oxides, which absorb the light travelling in the fibers. Single mode HAF are made by the Modified Chemical Vapor Deposition (MCVD) process, and the solution doping technique, which is used to incorporate the transition elements.³ Recently, there has been a demand for multimode HAF (NA of 0.10 to 0.30, with attenuation from 0.25 to 25 dB/cm at 850 nm) but MCVD is not well adapted to fabricate such fibers.

© 2002 Optical Society of America