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. 2015 Nov 4;5:16250. doi: 10.1038/srep16250

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Two spectral regions in the frequency comb are applied to an all-fibre Michelson interferometer with a time delay of τ Via synchronous detection, the repetition-rate frequency noise at (m–n)f_rep is detected and further used to lock the repetition-rate of a frequency comb to the fibre-delay line. AOM, acousto-optic modulator.