Title :
Modes of periodically segmented waveguides
Author :
Weissman, Z. ; Hardy, A.
Author_Institution :
Fac. of Eng., Tel Aviv Univ., Israel
fDate :
11/1/1993 12:00:00 AM
Abstract :
Modal properties of periodically segmented waveguides (PSWs) are analyzed by using the beam-propagation method and coupled-mode theory. The modal effective indices in a PSW are shown to be equal to those of a continuous waveguide with an averaged Δn. As a result, guided modes spread out, particularly those that are not strongly guided. The radiation loss is shown to oscillate with most of the waveguide parameters. In practical terms, this loss can be made negligible even for long periods. The results can be applied to the design of waveguide devices such as two-dimensional mode tapers and frequency-selective couplers
Keywords :
integrated optics; optical couplers; optical losses; optical waveguide theory; beam-propagation method; coupled-mode theory; design; frequency-selective couplers; grating waveguide; guided modes; lens waveguide; modal effective indices; modal properties; periodically segmented waveguides; radiation loss; two-dimensional mode tapers; waveguide devices; waveguide parameters; Couplers; Eigenvalues and eigenfunctions; Frequency; Optical coupling; Optical propagation; Propagation losses; Refractive index; Slabs; Waveguide components; Waveguide theory;
Journal_Title :
Lightwave Technology, Journal of
