OPTICAL BROAD-BAND PHASE DEVICES USING AXIALLY NONSYMMETRICAL W-TYPE OPTICAL FIBERS

This paper describes a numerical analysis of axially nonsymmetrical W- type optical fibers as optical-fiber-type broadband phase devices, Usi ng these devices, phase difference between two orthogonal linear polar izations can be kept constant in a broad wavelength range, The propaga tion characteristics along a circular core with an elliptical cladding structure and an elliptical core with a circular cladding structure a re numerically analyzed by the boundary-integral method, Using the num erical results, the performances of various broadband phase devices ar e theoretically compared.