Development of real-time, high-precision air fluctuation correction system for length calibration via net using optical frequency comb

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The possibility of using an adjacent pulse repetition interval length (APRIL) as a scale is investigated. In an experiment, an APRIL was measured by using a Helium-Neon interferometer, and the measurement was compared with the result of a direct frequency count. The difference was a few hundred nanometers, and thus the APRIL’s effectiveness as a length scale was confirmed. The present concept and analysis pave the way for the development of the remote transfer of APRIL as a length standard via fiber networks.