Abstract

A three-dimensional (3-D) explicit finite difference beam propagation method (3-D EFD-BPM) has been used to study the modal characteristics and losses of periodic segmented waveguides (PSW's). Results for the variation of the mode width and depth, as a function of the duty-cycle and period, are presented and compared with those obtained using the equivalent continuous waveguide model at a wavelength of 1.55 \mum. The radiation losses associated with the modulation of the refractive index are studied and we show that a 3-D representation of a PSW is necessary to evaluate the radiation loss.

[IEEE ]

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