CONFINEMENT AND EXCITATION OF THE FUNDAMENTAL MODE IN SINGLE-MODE GRADED-INDEX FIBERS - COMPUTATION BY A SIMPLE TECHNIQUE

Based on a simple series expansion method involving the Chebyshev tech nique, we compute the fractional modal power guided inside the fibre c ore and also the excitation of the fundamental mode in the case of sin gle-mode graded index fibres with examples of step and parabolic index cores. Relevant analytical expressions are presented for both studies . Excellent agreement with the exact results attest to the accuracy of the proposed simple method.