Abstract
AbstractTo completely protect optical fibers from external water and chemicals, the development of compound‐filled cable splice closure was planned. To this end, the optical loss mechanism at low temperatures in an optical fiber placed in a compound such as epoxy or polyurethane has been investigated. In this paper, as the optical loss generating source in an optical fiber in a compound‐filled cable splice closure at a low temperature, the conventional bucking model of the fiber in a fiber jacket and a new bucking model of the entire jacketed fiber in the compound are considered. It is demonstrated that a phenomenon corresponding to either model appears depending on the kind of compound or jacketed fiber configuration. Next, an experimental equation is derived which shows the relationship between the optical loss and the average rate of curvature of a bucked and sinusoidally bent GI fiber. The optical loss in a GI fiber placed in a compound at a low temperature was estimated and compared with the experimental results. It is found that the experimental and theoretical values agree well even if the compound and the jacketed fiber are replaced. This implies that the two models are valid. Quantitative understanding of the optical loss after bucking is now possible.
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