PROPAGATION CHARACTERISTICS OF GRADED-INDEX ELLIPTIC-CORE FIBERS

The variational approach for the circular-core fibres, formerly discussed by the present authors, is extended to treat graded-index elliptic-core fibres. The paper demonstrates the effectiveness of the variational approach when studying complicated problems. In order to bring out this effectiveness, a less complex scalar problem is considered. This problem is solved for deformed, circular-core fibres with a central dip in the refractive index profile, by considering it as special case of a graded-index elliptic-core fibres. This method is also computationally fast.