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A novel photonic frequency down-conversion scheme is proposed and demonstrated through directly modulating a dual-wavelength single-longitudinal-mode fiber laser. A 10.6 GHz microwave is down-converted to 1 GHz and a >7 dB signal-to-noise ratio is obtained.
An approach for frequency up-conversion in radio-over-fiber system is demonstrated by simulation. The technique employs a phase modulator and an FBG. Error-free data transmission was demonstrated for downlink with frequency conversion from 3 GHz to 53 GHz.
An optical frequency down-converter based on four-wave mixing in highly nonlinear fibers is proposed and experimentally realized for radio-over-fiber systems. A down-converted 1.5 GHz intermediate-frequency signal is obtained from a received 11.1 GHz millimeter-wave signal.
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