Abstract

The finite-difference beam-propagation method (FD-BPM) [1] and the finite-difference time-domain method (FD-TDM) [2] are powerful tools of analyzing the propagating beam in an optical waveguide. The FD-BPM based on the Crank-Nicholson scheme has the advantage of unconditional stability. Since the FD-BPM assumes only travelling waves, reflected waves generated at longitudinal discontinuities have been neglected.

© 1996 Optical Society of America