We have two models that are contained in components in the Free Space Optics library. One model is called the FSO Channel and the other model is called the OWC Channel. Both models are similar, but the parameters used are a little different. The FSO is more optimized for short reach applications and the OWC is best suited for long distance applications. However, each one can be used for any standard optical propagation between two telescopes. We can model losses, delays and scintillation.