Abstract
The MCVD fabrication scheme of optical fibers was modified by using chlorine drying and fluorine-phosphorus doped barrier layers to reduce the hydroxyl ion diffusion from the substrate tube. Additionally, chlorine gas was used in some fibers during the collapse procedure. The additional attenuation due to hydroxyl ion distribution of the fibers was measured by the differential mode attenuation (DMA) method. The results show that the variation in attenuation due to hydroxyl ions was lower in chlorine dryed optical fibers with fluorine-phosphorus doped barrier layers than in usual optical fibers with only boron barrier layers.
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