Long microwave delay fiber-optic link for radar testing

A long fiberoptic delay line is used as a radar repeater to improve radar testing capabilities. The first known generation of 152 mu s delayed ideal target at X-band (10 GHz) frequencies having the phase stability and signal-to-noise ratio (SNR) needed for testing modern high-resolution Doppler radars is demonstrated with a 31.6-km experimental externally modulated fiberoptic link with a distributed-feedback (DFB) laser. The test application, link configuration, and link testing are discussed.<
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