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# Lesson 18: BPM Analysis of an Anisotropic Buried Waveguide

## Introduction

This lesson outlines how to use the 3D vectorial BPM simulator for the Anisotropic medium. We simulate the waveguide defined in Lesson 17: Modal analysis of an anisotropic buried waveguide, the propagation of the beam in an anisotropic buried rectangular optical waveguide. The waveguide will be excited by launching an input field with Ex defined by…

## Setting Simulation Parameters

To set the simulation parameters, perform the following procedure. Step Action 1 In the Layout Designer, select Simulation > Simulation Parameters. The Simulation Parameters dialog box appears. 2 Click the Global Data tab. 3 In Starting Field, click Select and select Gaussian (see Figure 1). 4 In Reference Index, select User and enter 1.47762628 –…

## Viewing the Refractive Index Distribution (X-Y cut)

To view the permittivity distribution, perform the following procedure. Step Action 1 In the Layout Designer, click the Ref. Index (n) – 3D XY Plane View tab (see Figure 3). 2 Select Preferences > Refractive Index View > 3D Slice XY Plane. 3 Select one of the permittivity element tensors from the menu. Repeat this procedure…

## Setting the Field in the Input Plane

In this step, the field in the input plane will be set to a Gaussian distribution. Step Action 1 In the layout, double click the input plane. The Input Plane dialog box appears (see Figure 4). Figure 4: Input Plafne dialog box – Global Data tab 2 Set the Starting Field to Gaussian. The polarization…

## References

[1]     M. Ohtaka, “Analysis of the guided modes in the anisotropic dielectric rectangular waveguides”, Trans. Inst. Electron. Commun. Eng. Japan, Vol J64-C, pp. 674-681, Oct 1981. [2]      Y. Lu and F. Anibal Fernandez, “An Efficient Finite Element Solution of Inhomogeneous Anisotropic and Lossy Dielectric Waveguides”, IEEE Trans. Microwave Theory Tech., Vol. MTT- 41, pp. 1215-1223,…