Lumerical FDTD — Analyzing Results

Analysis Mode and Design Flow in Ansys Lumerical FDTD — Lesson 1

Data Types in Ansys Lumerical FDTD — Lesson 2

Results Manager in Ansys Lumerical FDTD — Lesson 3

Analysis Groups in Ansys Lumerical FDTD — Lesson 4

Plotting and Exporting Data in Ansys Lumerical FDTD — Lesson 5

Results Accuracy in Ansys Lumerical FDTD — Lesson 6

Summary — Lesson 7

Quiz — Lumerical FDTD — Analyzing Results

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Quiz — Lumerical FDTD — Analyzing Results

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Quiz — Lumerical FDTD — Analyzing Results

Lumerical FDTD — Analyzing Results Quiz — Lumerical FDTD — Analyzing Results Quiz — Lumerical FDTD — Analyzing Results

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Question 1 of 18

1. Question
Select the statements that are true:
- In layout mode no changes can be made to the geometry settings of structure
- In analysis mode no changes can be made to the geometry settings of structures
- In analysis mode no changes can be made to the geometry settings of monitors
- Once I switch from analysis mode to layout mode the variables in the script workspace will be lost
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Question 2 of 18

2. Question
The following image shows various data types in the Script Workspace. Which of the following corresponds to “Cell array”, “Struct” and “Rectilinear dataset” in the correct order?
- C, E, B
- C, E, A
- E, C, A
- E, C, D
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Question 3 of 18

3. Question
Data in the Result View window includes packaged dataset results and _____ which is unpackaged data.

For example, if the answer is black cloud, type "black cloud".
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Question 4 of 18

4. Question
The following image shows the Objects Tree. Which object is an analysis group?
- grating
- grating_T
- reflection
- FDTD
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Question 5 of 18

5. Question
Where in the following image would you click to switch the plot type to a vector plot?
- A
- B
- C
- D
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Question 6 of 18

6. Question
Where in the following image would you click to plot the x-component of the electric field?
- A
- B
- C
- D
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Question 7 of 18

7. Question
Where in the following image would you click to change the axes limits and labels of the plot?
- A
- B
- C
- D
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Question 8 of 18

8. Question
True or false? It is not possible to estimate the level of the absolute error in an FDTD simulation unless you have an analytical result to compare with.
- True
- False
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Question 9 of 18

9. Question
The "T" result returned by a 2D frequency-domain field and power monitor is a dataset which includes transmission data as a function of frequency. Which is the attribute of the dataset?
- Transmission
- Frequency
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Question 10 of 18

10. Question
See the following workflows for designing a device using FDTD. Select the recommended workflow.
- Set up initial simulation (coarse mesh) -> perform convergence testing of mesh -> run parameter sweep over large parameter range (fine mesh)
- Set up initial simulation (coarse mesh) -> run parameter sweep over large parameter range (coarse mesh) -> perform convergence testing -> run parameter sweep over narrow parameter range (fine mesh)
- Set up initial simulation (fine mesh) -> run parameter sweep over large parameter range (fine mesh)
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Question 11 of 18

11. Question
Select the statements that are true:
- Raw Data is available in Layout Mode whereas Results are available in Analysis Mode
- Switching from Analysis Mode to Layout Mode will remove any data stored in the scripting environment
- Switching from Analysis Mode to Layout Mode without saving will preserve the simulation data so it will be still be available if you re-open the simulation file
- It is necessary to switch from Analysis Mode to Layout Mode if you want to make changes to structures
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Question 12 of 18

12. Question
Which of the following statements about analysis groups are true?
- User-defined analysis group results can be visualized the same way as monitor results
- Analysis groups can collect data from any monitor in the simulation
- It is possible to add analysis groups from the Object Library
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Question 13 of 18

13. Question
Which of the following data formats can Lumerical export data to?
- Text file (.txt)
- Tagged image format file (.tiff)
- Lumerical Data File (.ldf)
- Matlab file (.mat)
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Question 14 of 18

14. Question
Select the methods that can be used to determine whether a simulation is terminated early due to reaching the auto-shutoff threshold?
- Checking the Job Manager window to see whether the progress bar reaches 100%
- Checking the Job Manager window for the status message “Early termination of simulation, the auto-shutoff criteria are satisfied.”
- Checking the log file for the message “Early termination of simulation, the auto-shutoff criteria are satisfied.”
- Checking the log file for the message “Simulation completed successfully”
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Question 15 of 18

15. Question
In this exercise, a 2D simulation is used to simulate a 1x2 port multi-mode interference (MMI) coupler. This device can be used to split or combine light, and in this case, light is input from one port on the left and split evenly between the output ports on the right. Anti-symmetric boundaries are used in the y-direction to take advantage of the symmetry of the structure and source.

Run the associated script file to set up the simulation.

Part 1: Auto shut off threshold

After running the simulation, check whether the auto-shutoff threshold is reached.

If the auto-shutoff level did not reach the threshold, re-run the simulation to find the necessary simulation time for the auto-shutoff threshold to be reached.

Was the auto-shutoff threshold reached?
- Yes
- No
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Question 16 of 18

16. Question
Part 1: Auto shut off threshold

Approximately how long does the simulation time need to be before the auto-shutoff threshold is reached (in units of femtoseconds)?

Choose from below the one closest to the result.
- 1150
- 1250
- 1350
- 1450
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Question 17 of 18

17. Question
Part 2: Convergence testing

Sweep the value of the mesh accuracy setting between 1-8 to perform convergence testing for the transmission through the T monitor. You can run the "mesh_accuracy" parameter sweep task to run the simulations. Information about using the parameter sweep tool can be found here.

Use mesh accuracy setting 3. Sweep the y span setting of the simulation region between 2.5 um and 5 um and measure the transmission through the T monitor. You can run the "y_span" parameter sweep task to run the simulations.

What mesh accuracy is required to obtain an absolute error due to the mesh below 5%?

For example, if the answer is 'mesh accuracy' of 7, type in 7.
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Question 18 of 18

18. Question
Part 2: Convergence testing

Approximately what 'y span' is required to obtain an absolute error below 1% (in units of microns)? Enter an integer value.
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