Hi Sushank,
Here is an answer from our OptiSystem team:
It is not presently possible to export raw 3D data from the Visualizers (I believe it can only be exported as a bit map). However, you can use the “View Signal Visualizer” to export the entire data set to an Excel document. Within the “View Signal Visualizer” screen, select the “Export to Excel” button. A window will open requesting that you enter a file name. Once the file is saved you will be able to view in Excel all the 2D spatial mode data for each transverse mode.
I have also attached an example Excel file.