Title :
Detailed error estimates for first order WKB calculation method
Author :
Jacobsen, G. ; Ramskov Hansen, J.J.
Author_Institution :
Technical University of Denmark, Electromagnetics Institute, Lyngby, Denmark
Abstract :
Using evanescent wave theory combined with nonlinear transformation techniques, very accurate upper and lower limits of the exact results for modal propagation constants and group delays are obtained for a near parabolic graded-index optical fibre. Comparing to a first order WKB solution we find WKB errors in group delays of 3¿10 ps/km compared to the exact results, the fundamental mode specifying the worst case.
Keywords :
WKB calculations; error analysis; optical fibres; optical waveguide theory; error estimates; evanescent wave theory; first order WKB calculation method; group delays; modal propagation constants; near parabolic graded index optical fibre; nonlinear transformation techniques;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19800376
