Hybrid free space optical/RF networks for tactical operations

We discuss our research and development in high availability, high bandwidth, tactical communications and networks using hybrid (free-space optical (FSO)) and RF links. To achieve this, the primary high data rate bridges use free space laser links, in parallel with high performance RF links. To manage this dynamic network, in which nodes may lose connectivity in the optical domain, the RF domain, or both, requires an innovative approach to network operation. The software that controls the network, must be aware of the actual and potential physical connectivity of the network, must exploit connectivity to maximize quality of service (QoS), and be able to handle the constant changeover on individual links between optical and RF connectivity. The key technologies under research and development include: topology and diversity control software; hardware for pointing, acquisition and tracking (PAT); and a combined aperture FSO/RF transceiver with joint PAT.