Accession Number : ADA294651

Title :   The Phase Sensitivity of an Infinite Length Optical Fiber Subjected to a Forcing Function at a Definite Frequency and Wavenumber.

Descriptive Note : Progress rept.,

Corporate Author : NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI

Personal Author(s) : Hull, Andrew J.

PDF Url : ADA294651

Report Date : 03 APR 1995

Pagination or Media Count : 39

Abstract : The model developed in this report provides an exact solution to the equations of motion for an infinite length, axisymmetric, isotropic, forced cylindrical rod. The resulting mechanical stresses are inserted into the governing equations of optical phase sensitivity and the change of refractive index for an optical fiber. This approach produces a closed-form model of light propagation in the fiber when the fiber is subjected to external forcing functions at a definite wavenumber and frequency. The closed-form solution is then compared to a finite element solution and to experimental data. It is shown that the optical phase sensitivity of an infinite length fiber is shear stress dominated. When the fiber is subjected to normal pressure, the frequency domain dynamics are extremely small. However, when the fiber is subjected to shear stress, a 20-dB drop in optical phase sensitivity results between 50 and 500 Hz. A low-wavenumber approximation of the model is included, and simulations show its accuracy to a wavenumber of at least 4000 rad/m at 50 Hz.

Descriptors :   *FIBER OPTICS, *FINITE ELEMENT ANALYSIS, OPTICAL PROPERTIES, EXPERIMENTAL DATA, REFRACTIVE INDEX, ACCURACY, SENSITIVITY, CYLINDRICAL BODIES, LENGTH, SHEAR STRESSES, LIGHT TRANSMISSION, PRESSURE, AXISYMMETRIC, RODS, FREQUENCY DOMAIN.

Subject Categories : Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE