Hello,
You may check the eye diagram datasheet that you can access from the component properties popup window that you can select by right click on the visualizer. Also, you may check the examples in the example library at the following link for more information. Please see the attachment.
C:\Users\xxxxxxxx\Documents\OptiSystem 16.0 Samples\Optical receiver design and analysis\Jitter analysis\
Please check the data sheet of the Electrical Jitter component for details on the calculation.
Regards,
Ahmad