As in every project, we start with creating materials of the wafer. Assume Lithium Niobate substrate and air cladding:

StepAction
1From the File menu, select New.

The Initial Properties dialog box appears.

2Click Profiles And Materials.

The Profile Designer opens.

3Under OptiBPM Designer 1, in the Materials folder, right-click the Dielectric folder and select New.

The Dielectric1 dialog box appears.

4Create the following dielectric material :

Name: air

Refractive index (Re:): 1

5Click Store.

The Dielectric material air is saved in the Materials folder.

6Under OptiBPM Designer 1, in the Materials folder, right-click the Diffused folder and select New.

The Diffused1 dialog box appears.

7Create the following dielectric material :

Name: Lithium niobate_1

8Click Store.

The Diffused material Lithium niobate_1 is saved in the Materials folder.

Creating the reference profile

While in Profile Designer, create a new Ti:LiNb03 (default) profile. This new predefined profile will serve as a reference, and will be used for comparison with the user defined profile we are going to design.

StepAction
1Under OptiBPM Designer 1, right-click the Diffusion-Ti:LiNb03 folder, and select New.
2Type the following Profile name:

Ti:LiNb03 Profile

3Use the following (default) values: Lateral diffusion length: 4.0

Diffusion length in depth: 3.5

4Click Store.
5Close the Profile Designer.

Defining the layout settings

Coming back to the layout designer setup the layout settings as follows:

StepAction
1Type/select the following:

Waveguide Properties

Width (μm): 4.0

Profile: Ti:LiNb03 Profile

Wafer Dimensions

Length (μm): 100

Width (μm): 30

2D Wafer Properties

Material: Lithium niobate_1

3D Wafer Properties

Cladding

Material: air

Thickness: 3

Substrate

Material: Lithium niobate_1

Thickness: 8

2To apply the settings to the layout, click OK.

The layout window appears.