Radiation resistant optical waveguide fiber and method of making

Details Radiation resistant optical waveguide fiber and method of making Radiation resistant optical waveguide fiber and method of making

1994-07-11

1996-04-16

Healy, Brian

Optical waveguides

Having particular optical characteristic modifying chemical...

Of waveguide core

385123, 385124, 385141, 65385, G02B 600, C03B 37023

Patent

active

055091016

ABSTRACT:
A radiation resistant optical waveguide fiber doped with fluorine or drawn with low tension in the fiber. The fluorine doping is substantially constant across the core and a portion of the clad adjacent the core. The concentration of the fluorine is in the range of about 0.3 to 3.0 weight percent. The draw tension is less than or equal to about 5 grams (40 dynes/cm.sup.2) to achieve optimum radiation resistance. A synergy is found when fluorine and low draw tension are applied to a fiber. Improvement in radiation resistance is largely independent of fiber type and geometry.
Further improvement in radiation resistance is found when germanium is doped in a portion of the clad adjacent the core.

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Formation of Drawing Induced E Centers in Silica Optical Fibers by Y. Hibino et al. Japanese Journal of Applied Physics, 1985 No Month.
Drawing Condition Dependence of Radiation-Induced Loss in Optical Fibers, by H. Hanafusa et al. Electronics Letters V. 22, No. 2, 1986. No Month.
Influence of Preform and Draw Conditions on UV Transmission and Transient Radiation Sensitivity of an Optical Fiber by Lyons et al. Proceedings SPIE vol. 1174, Fiber Optics Reliabilty: Benign and Advese Environments III. 1989 Symposium No Month.
A Review of Single-Mode Fibers with Modified Dispersion Characteristics, Ainslle et al., Journal of Lightwave Technology, vol., LT-4, No. 8, Aug. 1986.

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