Comparison of the Simulated Phase Sensitivity of Coated and Uncoated OpticalFibers from Plane-Strain Vibration and Static Pressure Models

摘要

A model of the plane-strain vibration of an infinitely long, layered rod with anaxisymmetric radial pressure is developed from the exact three-dimensional equations of motion with small argument approximations for the Bessel functions. Applied to both a coated and uncoated optical fiber, this model predicts phase sensitivity using the Pockels coefficients for silica glass. It is shown that the phase sensitivity of the coated optical fiber in forced plane-strain vibration is insensitive to the coating material or coating thickness, while the phase sensitivity of the uncoated optical fiber is equal to the k = O results of forced wave propagation in the fiber and is independent of frequency. A comparison of the phase sensitivity from plane-strain vibration to the phase sensitivity from three static plane-strain models (each with a different boundary condition) is also made. The strains predicted from both models are shown to be identical when a zero axial strain boundary condition is assumed.