Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Defect formation and related radiation and hydrogen response in optical fiber fabricated by MCVD

Not Accessible

Your library or personal account may give you access

Abstract

It has been observed in the VAD process that the concentration of reduced germania defects can be greatly decreased by using an O2/ He mixture during sintering in contrast to conventional sintering conditions using helium, which minimize any problems with bubble formation.1 A dependence of radiation sensitivity on the oxygen flow rates during deposition of phosphorus doped preform claddings by MCVD has also been reported.2 Normally the collapse step in the MCVD process is performed using high concentrations of oxygen (>90%) and small amounts of chlorine. Here we purposely collapse preforms using high concentrations of helium and chlorine to increase the concentration of germania suboxide defects to understand better what determines the radiation sensitivity and hydrogen reactivity of fibers. Our experiments indicate that both can be deliberately influenced by changing the oxygen and, to a lesser degree, the chlorine concentration of the preform collapse atmosphere. A series of germania doped silica preforms was fabricated according to a strategy in which each preform was collapsed into two separate sections that were identical except for the relative flows of oxygen, helium, and chlorine. The radiation-induced loss at 1.31 μm of fibers collapsed in four different flow conditions is presented in Fig. 1, which shows that fiber drawn from preforms collapsed in a low oxygen partial pressure is ~20 times more susceptible to radiation damage than fiber fabricated in a more oxidizing environment. (A 60Co source was used at 270 rad/s for 5 min in darkness.) Fibers from preforms collapsed in low vs high oxygen conditions were also exposed to 1-atm hydrogen at 150°C with the low oxygen fiber exhibiting an initial rate of loss increase about 6 times that seen in high oxygen fiber (Fig. 2).

© 1990 Optical Society of America

PDF Article
More Like This
Influence of trace amount· of germania on the lose performance of silica core fibers

K. T. NELSON, P. J. LEMAIRE, KENNETH L. WALKER, K. J. WESSER, and H. T. SHANG
WA2 Optical Fiber Communication Conference (OFC) 1987

Enhanced second-harmonic generation in with gamma rays irradiated fibers

A. Kamal, D. A. Weinberger, and J. H. Chu
TuGG2 OSA Annual Meeting (FIO) 1990

Effect of fluorine and phosphorus on the UV-excited fluorescence in germania-doped silica optical fiber preforms

H. T. SHANG, D. L. PHILEN, and P. F. GLODIS
TuL27 Optical Fiber Communication Conference (OFC) 1986

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved