Abstract
We demonstrate an error-free four-user /spl sim/3-GHz-spaced subcarrier multiplexing (SCM) experiment, where, for the first time to our knowledge, we use optical direct-detection via optical hyperfine wavelength-division multiplexing instead of heterodyne beating detection that is conventional for SCM. A hyperfine optical blocking filter allows optical single-sideband modulation with strong carrier suppression /spl sim/ 20 dB below the unsuppressed single sideband and strong sideband suppression /spl sim/20 dB.
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