Special Script Commands for Working with FDE Data — Lesson 4

Lumerical FDE — Analyzing Results Special Script Commands for Working with FDE Data — Lesson 4

While using the GUI works fine in most cases, script commands can be used to replace tediously repetitive jobs or to perform a custom analysis. Here are some of the key script commands for FDE analysis:

Getting the Calculation Parameters of Eigensolver Analysis Window:

Command	Syntax	Description
getanalysis	?getanalysis;	Lists all the parameters in the analysis window.
getanalysis	getanalysis("property");	Returns the current value of a particular property in the analysis window.

Example: Get the number of trial modes used in the eigensolver.

Nmodes = getanalysis(“number of trial modes”);

Getting Results and Analysis:

Command	Description
nummodes	Returns number of modes found Example:
findmodes	Calculates the modes supported by settings. This is equivalent to pressing the "Calculate Modes" button in the modal analysis tab.
frequencysweep	Runs a frequency sweep. This is equivalent to pressing the "Frequency Sweep" button in the Frequency analysis tab.
selectmode	Selects the mode by mode number in mode list
overlap	Returns the overlap and power coupling between two modes
bestoverlap	Returns the name of the mode with highest overlap with a specified mode

Example 1: Perform a frequency sweep on the first mode and plot the dispersion.

switchtolayout;
findmodes;
selectmode(1);
setanalysis("track selected mode",1);
setanalysis("detailed dispersion calculation",1);
frequencysweep;
D=getdata("frequencysweep","D");
f=getdata("frequencysweep","f_D");
plot(c/f*1e6,D*1e6,"Wavelength (um)", "Dispersion (ps/nm/km)");

Example 2: Find out which mode in the mode list has the best overlap with the D-Card named " test_mode." and return its effective index.

mode_name = bestoverlap("test_mode");
neff = getdata(mode_name,"neff");

To get data from particular modes, you can use getresult or getdata commands.