The improved frequency-stability and the very broad frequency-band of femtosecond mode-locked optical frequency comb (FOFC) have led to new applications in several precision metrology application areas such as high-precision optical frequency metrology, spectroscopy, and distance measurements. We have analyzed the temporal coherence function of the FOFC. As a result, it has been understood that the temporal coherence peaks exist during the time which is equal to the repetition interval in the traveling direction of the FOFC. In order to make the best use of the temporal coherence characteristic of an FOFC, we propose an FOFC-based multiplex Michelson interferometer that can use as a distant estimation. The present technique is expected to be useful for high-precision measurement of distances for not only science purposes but also industry requirements.
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