Characterization of single-mode coated fibers at low temperatures using periodic distortion of the fiber axis

Microbending effects on cabled single-mode optical fibers are analyzed both theoretically and experimentally over the temperature range -30°C-25°C. The loss in single-mode fiber is attributed to the coupling between the guided and radiative modes caused by micro-bending effects. The primary coupling between the guided LP
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and the radiative LP
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modes is studied by imposing periodically controlled perturbations on the fiber axis at different temperatures.