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The difference frequency of two lasers is stabilised by an optical discriminator to produce a stepped microwave frequency source with phase noise levels of -90 dBc/Hz at 1 kHz offset, with potential for operation up to 100 GHz.
An optical beamformer incorporating a 360/spl deg/ phase SLM was remotely coupled to a nine-element antenna through 100 metre of ribbon fibre. In our antenna test facility it provided stable and close-to-theoretical performance at 1.3 GHz.