This paper presents realistic simulation modules to assess characteristics of multi-transceiver free-space-optical (FSO)
mobile ad-hoc networks. We start with a physical propagation model for FSO communications in the context of mobile
ad-hoc networks (MANETs). We specifically focus on the drop in power of the light beam and probability of error in
the decoded signal due to a number of parameters (such as separation between transmitter and receiver and visibility
in the propagation medium), comparing our results with well-known theoretical models. Then, we provide details on
simulating multi-transceiver mobile wireless nodes in Network Simulator 2 (NS-2), realistic obstacles in the medium and
communication between directional optical transceivers. We introduce new structures in the networking protocol stack
at lower layers to deliver such functionality. At the end, we provide our findings resulted from detailed modeling and
simulation of FSO-MANETs regarding effects of such directionality on higher layers in the networking stack.
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