Fiber optic links for airborne EHF SATCOM terminal applications

Results of implementing fiber optics at 11 GHz in an experimental satellite communication EHF/SHF research terminal for airborne applications are reported. System measurements were made after a 100-m-long fiber-optic link replaced a 4-ft-long coaxial cable to enable the antenna to be positioned remotely from the terminal at X-band. Some of the advantages and disadvantages of fiber optics compared to coaxial and waveguide systems are discussed. It is concluded that the insertion of a 100-m-long fiber-optic link in a satellite communication terminal for airborne applications did not significantly degrade the SATCOM terminal performance. The link provides a lightweight, long-distance remote connection that is not practical at high frequencies with coaxial cable or waveguides.<
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