Abstract

The 630-nm loss band recently identified in unclad fibers made from low-OH-content vitreous silica is shown to be introduced in the fiber-drawing process. The band has an absorptive component as well as resonance fluorescence whose peak intensity amounts to about 16% of the total losses. A red fluorescence was observed when the same fibers were illuminated with the 325-nm line of a HeCd laser. The loss band could be eliminated by annealing for 3 h at 700 °C. Spontaneous annealing at room temperature was also observed in some cases. It is proposed that the 630-nm band is associated with drawing-induced defects of the silica network.

© 1974 Optical Society of America

Spectral losses of unclad vitreous silica and soda-lime-silicate fibers

P. Kaiser, A. R. Tynes, H. W. Astle, A. D. Pearson, W. G. French, R. E. Jaeger, and A. H. Cherin
J. Opt. Soc. Am. 63(9) 1141-1148 (1973)

Measurement of spectral total and scattering losses in unclad optical fibers*

P. Kaiser and H. W. Astle
J. Opt. Soc. Am. 64(4) 469-474 (1974)

Laser Drawing of Optical Fibers

U. C. Paek
Appl. Opt. 13(6) 1383-1386 (1974)

Partially cladded triangular-cored glass optical fibers and lasers*

A. R. Tynes
J. Opt. Soc. Am. 64(11) 1415-1423 (1974)

Refractive index and diameter measurements of unclad optical fibers

H. M. Presby
J. Opt. Soc. Am. 64(3) 280-284 (1974)