Thermally induced microbending losses in double-coated optical fibers at low temperature

Abstract

The microbending losses induced by temperature drop in dobule-coated optical fibers have been analyzed by thermoelastic approach. The microbending loss is dominated by the lateral pressure in the glass fiber. To minimize such microbending loss, the thickness and Young's modulus of secondary coating and Poisson's ratio of primary coating should be increased. On the other hand, the Young's modulus of primary coating should be decreased. However, the thickness of primary coating exists an optimum value. The glass transition temperature of primary coating should be lower than the temperature range under consideration.