Quiz: Ansys Lumerical FDE — Analyzing Results

You are in analysis mode and have data in script workspace, DECK, and 'FDE' objects. If you click 'Save' from the 'Files' menu in the main window, some of these data are saved with the simulation file and will be available when you re-open the simulation file. Which of the following data can be saved with a simulation file?

Selecting the mode in the Mode list allows you to visualize the mode in the Plot area of the Eigensolver window

The modes in the Mode list can include unphysical modes. Which results can provide you with relevant information about whether a mode is physical or not?

Which of the following options is available in the Frequency analysis tab, but not in the Modal analysis tab?

Match the tasks with their best tools:

Select all the statements that are true.

Which of the following parameters in the FDE solver commonly require convergence testing?

Which one of the following script commands is equivalent to pressing the ‘Calculate Modes’ in the Modal analysis tab of the Eigensolver window?

You have created a sweep for convergence test as below by sweeping the number of mesh cells and tracking the neff of the first mode in the Mode list, but the Result drop-down menu shows no results to choose from.

What do you need to do to resolve this issue, and make the result available in the sweep?

Which of the following red-marked object or areas directly shows you an option for data export to a file at a single mouse-click? 

Below are randomly-ordered effective indices of all the modes in the MODE list. Which one of them corresponds to mode number ‘1’?

Download the simulation file, FDE_Analyze_QE_ex_1.lms, to answer the question. How many physical modes does the waveguide support at 1.55 um?

Download the simulation file, FDE_Analyze_QE_ex_1.lms, to answer the question. What is the ‘fraction integrated’ value of the power of the fundamental mode that is contained within the Si waveguide region?

Round the answer to second decimal figure, for example, 30.25

Download the simulation file, FDE_Analyze_QE_ex_1.lms, to answer the question. What is the ‘fraction integrated value’ of the farfield of the fundamental TE mode at a wavelength of 1.55 um within the angle of 50 degrees? Normalize to the near field mode.

Round the answer to second decimal figure, for example, 30.25

Download the simulation file, FDE_Analyze_QE_ex_1.lms, to answer the question. Run frequency sweep over the wavelength range of 1.5 – 1.6 um and track the fundamental mode. What is the group index at 1.55 um?

Round the answer to the third decimal figure, for example, 3.256

The mode profiles of each mode are independently normalized so the peak field intensity is 1.

Which of the following analyses can be done in the Eigensolver analysis window?

Download the simulation file, FDE_Analyze_FE_ex_1.lms, which contains a high-index waveguide on top of a low-index substrate. Increasing which of the following parameters can result in a higher effective index for the fundamental mode? When changing one parameter, it is assumed that all the other parameter values stay fixed.

Download the simulation file, FDE_Analyze_FE_ex_1.lms, which contains a high-index waveguide on top of a low-index substrate. Increasing which of the following parameters can result in a spatially broader field distribution of the fundamental mode? When changing one parameter, it is assumed that all the other parameter values stay fixed.

Download the simulation file, FDE_Analyze_FE_ex_2.lms, which contains a silicon waveguide embedded in a silica cladding. You are going to sweep the mesh size of the mesh override and track the effective index of the fundamental mode in the mode list. To do that,

1. Add a sweep object in the Optimizations and Sweeps window
2. Add two parameters for the ‘dx’ and ‘dy’ of the mesh override (for both dx and dy, use 10 sweep points from 50 nm to 5 nm with a decrement of 5 nm)
3. Add the ‘neff’ of the fundamental mode to the Results

What is the largest mesh size among the 10 sweep points that gives an neff value within the range of 2.444 +/- 0.0005 ?