Stresses, microbending loss, and refractive-index changes induced simultaneously by axial strain and hydrostatic pressure in double-coated optical fibers are analyzed. The lateral pressure and normal stresses in the optical fiber, primary coating, and secondary coating are derived. Also presented are the microbending loss and refractive-index changes in the glass fiber. The normal stresses are affected by axial strain, hydrostatic pressure, material properties, and thickness of the primary and secondary coatings. It is found that microbending loss decreases with increasing thickness, the Young’s modulus, and the Poisson’s ratio of the secondary coating but increases with the increasing Young’s modulus and Poisson’s ratio of the primary coating. Similarly, changes in refractive index in the glass fiber decrease with the increasing Young’s modulus and Poisson’s ratio of the secondary coating but increase with the increasing Young’s modulus and Poisson’s ratio of the primary coating. Therefore, to minimize microbending loss induced simultaneously by axial strain and hydrostatic pressure in the glass fiber, the polymeric coatings should be suitably selected. An optimal design procedure is also indicated.

© 2002 Optical Society of America

[Optical Society of America ]

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