Hi Aabid..
Well Optical Intrusion Detection seems to be a very interesting area. Very less importance is given to security aspect in the field of Optical Communication. It is great if you wish to work on it.
And as far as simulating it is concerned, I don’t think you would find straightforward blocks for it in Optisystem. You might have to simulate the concept using existing general components/blocks here.
Cheers. Regards.