  We experimentally demonstrate a versatile technique for performing dual-comb
interferometry using a single frequency comb. By rapid switching of the
repetition rate, the output pulse train can be delayed and heterodyned with
itself to produce interferograms. The full speed and resolution of standard
dual-comb interferometry is preserved while simultaneously offering a
significant experimental simplification and cost savings. We show that this
approach is particularly suited for absolute distance metrology due to an
extension of the non-ambiguity range as a result of the continuous
repetition-rate switching.
