Dear Miroslav,
There is no example in OptiSystem Example Library that fits directly your needs.
You may use combination of two examples to create your own. The LAN examples are located at C:\Users\USER NAME\Documents\OptiSystem 21.0 Samples\Metro and access systems\ and the LiFi examples are located at C:\Users\USER NAME\Documents\OptiSystem 21.0 Samples\Optical wireless\.
Regards,
Ahmad