Abstract
We introduce a mathematical model based on a concept of intrinsic mode in
order to analyse and synthesise optical wave propagation and radiation occurring in
a non-uniform optical waveguide used in integrated optics as optical coupler. The
model is based on numerical evaluation of electromagnetic wave by applying an
intrinsic field integral to evaluate the field behaviour inside the optical
waveguide. To analyse the field distribution inside the non-uniform waveguide and
predict the beam propagation of optical energy involved in the propagation process,
it is necessary to track the motion of any observation point along the tapered
waveguide itself. Physically, the rays of the spectrum undergo reflections on the
waveguide boundaries until the cut-off occurs and the phenomena of radiation begin.
The numerical results show good agreement with those obtained by classical methods
of evaluation used by other works.
© 2014 Chinese Optics Letters
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