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A laboratory 4*4 transparent node for the space frequency domain has been set up in which optical frequency division multiplexed (OFDM) signals at different bit rates and modulation schemes can be switched simultaneously. The feasibility, signal path architecture, supervision, control, and performance of this node are reported.<<ETX>>
A laboratory ten-channel coherent fibre-optic broadband transmission system is reported. The frequency-division-multiplexed optical carriers are separated by 6 GHz and are demultiplexed by a tunable heterodyne receiver having a sensitivity of -46 dBm at a bit error rate of 10-9. In this system a maximum number of 64 channels can be installed.
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