A Study for the Thermal Heutron Effects on Optical Fiber

광섬유에 대한 열중성자 효과 연구

  • Published : 1990.12.01

Abstract

In this study, the thermal neutron effects on optical fiber are examined theoretically. Also, the induced loss by thermal neutron irradiation in optical fibers is measured at the optical wavelengths of 0.85 and 1.3\ulcorner, respectively, and the results are analyzed. Thermal neutrons cause nuclear reaction with fiber compositions. So secondary ionizing radiations of high energy are generated. Color centers formed by these secondary ionizing rasiations increase transmission loss of optical fiber by absorbing propagating light in fiber core. As a result of experiment, owing to Ge, P, and B doping effects, the induced loss in multimode fibers has been 5 tmes larger than that in single mode fibers at 1.3 \ulcorner wavelengh. In case of multimode fibers, the loss at 0.8 \ulcorner wavelength region more suceptible for radiations has been twice higher than at 1.3\ulcorner.

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