A major challenge in mobile settings is handling of this fragility of FSOC links due to the highly directional distribution of light intensity within the light beams. Furthermore, this work provides an experimental demonstration of the testbed capabilities for single-user and multiple-user scenarios.įree-space optical communication (FSOC) have directional light beams which makes communication links very sensitive to movement. The work described below details hardware components integrated in the platform, as well as software development for the cognitive controller. If multiple-user transmissions are identified, signals are routed into separate high-speed photodetectors for processing. Given that a single-user transmission is detected on multiple paths, diversity combining will be performed to improve received signal-to-noise ratio (SNR). Accordingly, the controller drives an optical switch to route detected signals to pre-defined paths. At the receiver side, a cognitive controller performs real time, blind processing of received signals for identifying the number of concurrent transmissions. The testbed consists of multiple, independently tunable optical transmitters and receivers that can be configured to emulate various communication scenarios (e.g., point-to-point (P2P), point-to-multipoint (P2MP), and multi-point-to-multipoint (MP2MP). The FSOC testbed is multi-node, modular, and high-speed with real-time ability to test O-PHY modules and O-MAC schemes. These systems provide a significant improvement over those with currently hampered with single-user limitations. This paper presents an experimental FSOC testbed that demonstrates next generation FSO systems and allows cognitive, multi-point communication. An FSOC system platform is essential for fully characterizing, testing, and evaluating state-of-the-art, multi-user prototypes and technologies developed by both businesses and academic communities. FSOC’s point-topoint nature has boosted extensive research on technologies and methods that support multi-user optical networks. Multi-point free space optical communication (FSOC) has been identified as a valuable and promising technology for meeting high-capacity and -density demands of future space and terrestrial communication networks.
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