{"id":373105,"date":"2024-07-22T19:50:47","date_gmt":"2024-07-22T19:50:47","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/interconnect-setsparameter-function-option-s-coefficient-use\/"},"modified":"2024-07-22T19:50:47","modified_gmt":"2024-07-22T19:50:47","slug":"interconnect-setsparameter-function-option-s-coefficient-use","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/interconnect-setsparameter-function-option-s-coefficient-use\/","title":{"rendered":"InterConnect setsparameter function, option “s coefficient” use :"},"content":{"rendered":"

Dear all,<\/span><\/p>\n

I  am working on Lumerical and InterConnect as part of my internship. My goal is to extract the S parameters from a structure on Lumerical then implement them in a scripted element on InterConnect in order to be able to build more complex circuits with correct simulation times. At first, I stored the frequency, amplitude and phase on a .txt file to use them on a scripted element. This worked great with the setsparameter function and the “transmission” option. But my new objective is to extract the coefficients representing the functions which are formed by the parameters S. For this I also want to use the setsparameter function with the “s coefficient” option. (setsparameter(“output_port”, “mode_label”, output_mode_ID, “input_port”, input_mode_ID, “s coefficient”, coeff, frequency) _ https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034407774-setsparameter -script-command )<\/span><\/p>\n

Only I don’t understand what exactly to put in the coeff matrix.<\/span><\/p>\n

Here is the example of a structure I am working on: a simple waveguide.<\/span><\/p>\n

When I used the “transmit” function of the setsparameter function, I stored the frequency, amplitude, and phase of the Port1.b\/Port1.a (S11) and Port2.a\/Port1.a (S21) ratio.<\/span><\/p>\n

Now, with the “s parameter” option if I understand the explanation correctly:<\/span><\/p>\n

(“Sets the s-parameter between “output_port” and “input_port”, using ‘s’ domain coefficients. coeff is a matrix with 2 columns: complex numerators and complex denominators. The number of rows of the matrix is <\/span>\u200b\u200b<\/span>the number of coefficients points. If the number of numerators is different from the number of denominators, set the missing values <\/span>\u200b\u200b<\/span>to zero. frequency is the center frequency of the transmission described by the coefficients. <\/span>” and “input_mode_ID” are numbers (i.e., 1, 2, 3…).)<\/p>\n

I must create a matrix with the first column, the coefficients of the function representing the data of Port1.b or Port2.a for the column of numerator complexes and Port1.a in the second column for the column of denominator complexes? This is what I have tried, among other things, until now. I store the S parameter data in a txt file with Lumerical. Then I use the polyfit function of MATLAB to separately extract the coefficients of the real part and the imaginary part of the denominator and numerator column.<\/span><\/p>\n

Here is an example of what I get from MATLAB in the form of a file. txt:<\/span><\/p>\n

 <\/span><\/p>\n

Then I manually fill the coeff matrix on Interconnect with these coefficients.<\/span><\/p>\n

Or should I only keep the real or imaginary part of the coefficients? I tried several cases including the very first case cited but I did not get the expected results at all and despite the tests, I cannot understand how to use the function with the “s parameter” option.<\/span><\/p>\n

Hoping someone can help me!<\/span><\/p>\n

Thank you for your time!<\/span><\/p>\n

Camille D.<\/p>\n","protected":false},"template":"","class_list":["post-373105","topic","type-topic","status-closed","hentry","topic-tag-interconnect","topic-tag-s-parameter-matrix-1","topic-tag-script"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t