Axial Strain Induced Microbending Losses in Tightly-jacketed Double-coated Optical Fibers

摘要

The microbending losses induced by axial strain in tightly-jacketed double-coated optical fibers are investigated. The lateral pressure in the glass fiber is derived, which is determined by the axial strain, material's properties of polymeric coatings and their thicknesses. The lateral pressure in the glass fiber would produce microbending loss. To minimize such a microbending loss, the Young's moduli of the secondary coating and jacket, and the Poisson's ratios of the primary and secondary coatings should be increased. On the other hand, the Young's modulus of the primary coating and the Poisson's ratio of the jacket should be decreased. However, based on the mechanical strength of polymeric coatings, there exist optimum values for the thicknesses of the primary and secondary coatings.