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Modified finite-difference formula for semivectorial H-field solutions of optical waveguides

1998; Institute of Electrical and Electronics Engineers; Volume: 10; Issue: 8 Linguagem: Inglês

10.1109/68.701524

1941-0174

Junji Yamauchi, Gen Takahashi, Hisamatsu Nakano,

Gyrotron and Vacuum Electronics Research

The propagation constants of rib waveguides are analyzed by the imaginary distance beam-propagation method based on a newly derived finite-difference formula for semivectorial H-fields. The formula ensures a truncation error of O(/spl Delta/x)/sup 2/, provided that the discontinuity lies midway between two mesh points. Comparison with previously published results for a rib waveguide as a classical benchmark shows the effectiveness of the present method.