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Frequency stabilisation of FDM optical signals to a comb of equally spaced frequencies has been demonstrated for optical signals originating from different locations. The result was achieved by locking each optical source to a resonance of a separate fibre Fabry-Perot cavity. The Fabry-Perot's comb of resonances was synchronised by locking all these devices to a master reference. Implementation of the frequency stabilisation circuit requires, at each location, a tunable fibre Fabry-Perot resonator, a photodetector and simple electronics. Such a simple circuit provides the means to frequency-stabilise a large number of FDM optical sources originating from different locations, as in a star network.