To calculate the mode, perform the following procedure.

Step Action
1 In the Layout Designer, select Simulation > Simulation Parameters.

The Simulations Parameters dialog box appears.

2 On the Global Data tab, type/select the following:

Starting Field:  Modal

Wavelength: 1.30

Reference Index: Modal

3 Open the Input Plane.
4 Select the Input Fields 3D tab.
5 Click Edit to open the Input Field dialog box.
6 Click All.

The information from the Waveguides list appears in the Fields list.

7 Click Mode.

The Calculate Mode dialog box appears.

8 Click Calculate Mode.

The Global Data:ADI Method dialog box appears (see Figure 9).

9 Type/select the following:

Solver:  Real

Mode: Scalar

BPM - Figure 9 Global Data:ADI Method dialog box

Figure 9: Global Data:ADI Method dialog box

10 On the Settings tab, select the following and click Properties.

Boundary Condition: Neumann

Starting Field: Gaussian

The Gauss Field Parameters dialog box appears (see Figure 10).

11 In the Gauss Field Parameters dialog box, select Type: Auto and click OK.

BPM - Figure 10 Gauss Field Parameters dialog box

Figure 10: Gauss Field Parameters dialog box

12 Click Calc. Mode.

The OptiBPM_M3Dsim window appears (see Figure 11).

Note: The modal index for Mode 1 is: 1.44961742. You can also view the electric field distribution in the simulation window.

BPM - Figure 11 Calculated modal index and modal field of SMF-28

Figure 11: Calculated modal index and modal field of SMF-28