Abstract
The tensile strength of high-silica waveguides is highly sensitive to structural inhomogeneities or foreign matter. Flaws found in MCVD fibers can originate from starting cladding tubes or during subsequent process steps. In one commercial process tubes are free drawn to a required size from a larger tube which is preformed by a silica deposition step. This process produces various grades of tubes, since the starting materials are either natural quartz or a higher purity synthetic silica (Suprasil).1 A second process continuously draws premelted natural quartz through an annular-shaped orifice of a refractory metal crucible. Since each tubing has unique steps, the source and nature of flaws affecting the mechanical properties of the fiber may also be different.
© 1983 Optical Society of America
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