This chapter describes how light propagation in straight dielectric waveguides can be modelled in the frequency domain (FD) by the finite-difference approach. By a straight waveguide, we understand a waveguide structure which is invariant in the direction of light propagation. Important examples of such waveguides are optical fibres, including microstructured fibres, and (the straight sections of) various slab and planar waveguide structures. Understanding and designing the properties of such waveguides are important in areas such as signal transmission (telecommunication), nonlinear signal processing, fibre lasers, and waveguide-based sensors. Therefore, efficient tools ...
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