Wide-angle propagating beam analysis based on the generalized Douglas scheme for variable coefficients.
The generalized Douglas scheme is applied to the finite-difference beam-propagation method (FD-BPM) with a (1, 1) Padé approximant operator. A truncation error of O(Deltax)(4) is found in the transverse direction. To assess the accuracy of the scheme, we investigate the propagation error of the fundamental mode in a two-dimensional tilted waveguide in terms of the coupling efficiency. The present scheme offers further improvement in the analysis of wide-angle beam propagation compared with the conventional FD-BPM.
J
J
Yamauchi
J
J
Shibayama
H
H
Nakano