19 August 2008 Hybrid free-space optical and radio frequency switching
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We describe characterization of a hybrid Free-Space Optical (FSO) and Radio Frequency (RF) link for efficient switching between the two links. The monitoring and switching are controlled by a program that checks the FSO connection health using echo packets. The switching program was tested using a fiber optic link that can simulate atmospheric attenuation and scintillation effects by using an optical modulator. The sensitivity to connection quality degradation and momentary connection outages can be optimized for a given system. Connection quality dependent switching rather than continuous operation of both FSO and RF links is desired in situations where RF use is to be minimized, while maintaining high reliability.
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David S. Kim, David S. Kim, G. Charmaine Gilbreath, G. Charmaine Gilbreath, Jonathan Doffoh, Jonathan Doffoh, Carlos O. Font-Jimenez, Carlos O. Font-Jimenez, Michele Suite, Michele Suite, } "Hybrid free-space optical and radio frequency switching", Proc. SPIE 7091, Free-Space Laser Communications VIII, 70910X (19 August 2008); doi: 10.1117/12.803633; https://doi.org/10.1117/12.803633

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