A Low-Cost, Man-Portable, Free-Space Optics Communications Device for Ethernet Applications
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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This thesis sought to design and implement a low-cost, portable, Free-Space Optics FSO communications device for Ethernet applications. Under some circumstances such a device would have utility at a Combat Operations Center COC, a Field Artillery Position, or wherever else fiber optic cable is used in garrison or field. The design was based on commercial off the shelf components originally designed for fiber optic applications. Based on a 155 megabits per second Mbps media converter, the design used two fiber optic transceivers, coupled to collimating lenses to pass data over free-space. Sustained data rate of 100 Mbps was achieved with full network functionality on the optical bench with a low-power 0.5mW laser diode transmitter without focusing optics on the receiver. The laser diode powermounted on device, was measured with acceptable losses up to 300 ft during testing using a photodiode with focusing optics. The findings indicate that the system with proper collecting optics could be optimized for free-space communication at short to moderate ranges.
- Lasers and Masers
- Fiber Optics and Integrated Optics