Formation of drawing-induced E' centers in silica optical fibers

Using an electron spin resonance technique, E' centers have been observed in pure silica optical fibers fabricated under various drawing conditions. The E'-center concentration increases with increasing furnace temperature and drawing velocity. The influences of the temperature and velocit...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1985-09, Vol.24 (9), p.1117-1121
Main Authors: HIBINO, Y, HANAFUSA, H, SAKAGUCHI, S
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Integrated optics. Optical fibers and wave guides
Optical and optoelectronic circuits
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Summary:Using an electron spin resonance technique, E' centers have been observed in pure silica optical fibers fabricated under various drawing conditions. The E'-center concentration increases with increasing furnace temperature and drawing velocity. The influences of the temperature and velocity have been studied by considering the diameter and temperature distributions of a preform in the drawing furnace. The analysis indicates that the E' centers are frozen in the optical fibers by a thermal activation process in the furnace. The activation energy for the creation of the E' centers is determined as 3.5±0.5 eV, and the effective recombination density for the decay of the E' center as 6.2×10 -13 . Furthermore, the fictive temperature of the optical fibers is estimated to be more than 2100 K from the E'-center concentration.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.24.1117