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Optical frequency switching without bit loss is demonstrated at the data rates of 156 and 622 Mbit/s in a four-channel frequency-division-multiplexing (FDM) crossconnect which employs fast tunable lasers and a fixed-tuned channel selection filter.<<ETX>>
100-channel optical FDM transmission/distribution at 622 Mbit/s is demonstrated for a fibre length of 50 km. A polarisation-insensitive waveguide frequency-selection-switch with 10 GHz intervals and an FSK/direct-detection scheme using a Mach-Zehnder filter type optical frequency discriminator are verified as feasible.<<ETX>>
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