The transmission loss increase phenomenon of silica fibers due to the effect of hydrogen is an important problem in the long-term stability of optical fiber communication. The loss increase is reported to depend on dopants such as P2O5, GeO2, and fluorine.1-3 Generally, optical fibers contain chlorine because chloride material is used as a raw material, often for dehydration, and to make depressed structures.

© 1985 Optical Society of America

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