Modelling of single-mode diffused channel optical waveguides

Abstract

We present some methods based on the variational principle for modelling of diffused channel waveguides and directional couplers. First, we present some analytical trial fields to model the mode of the channel waveguides. These are obviously limited in accuracy by the choice of the form of the trial field. To improve upon this aspect, we present a numerical method In which the trial field is automatically generated. This gives much better accuracy. Finally, we use these methods to model the characteristics of a directional coupler and compare the results with available experimental results.