Modal Analysis of Light Propagating Through Structurally Disturbed Optical Fibers

Yash Lohia


A technique to control and manipulate the spatial wave function of light inside an optical fiber by structurally disturbing the fiber was devised. Two interferometers were set up to sort the Hermite-Gauss modes of light produced by the fiber. These interferometers worked on the principal of parity by separating even modes from odd modes. Theory of the operation of the interferometers was developed with linear algebra. It was demonstrated that imposing stress on the optical fiber affects the make up and the intensities of the modes propagating rather than the phase difference between the modes. Lower stress was shown to produce smaller changes in these variables. Mathematica programs were written to model and analyze experimental data based on input parameters.