Introduction of single-mode fibers into subscriber loops is being studied from the viewpoint of technical feasibility.1 The technique of low-loss mass splicing is a major problem, and core eccentricity seems to limit the reduction of splice loss. We describe newly developed VAD single-mode fibers with ultimate tow-core eccentricity. Using the VAD process a core and a whole cladding have been synthesized with a high deposition rate.

© 1987 Optical Society of America

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