A single mode (SM) fiber with extremely low loss and sufficient long term reliability is indispensable for the coming ultra long span optical transmission system. As a promising candidate for such a high grade fiber, a pure silica core SM fiber has been introduced.(1) Owing to the absence of additional metal oxide to the core region, the proposed fiber features the low transmission loss due to low Rayleigh scattering and the increased chemical stability against hydrogen.

© 1986 Optical Society of America

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