title: Frequency Measurement System of Optical Clocks Without a Flywheel Oscillator.
abstract: We developed a system for the remote frequency comparison of optical clocks. The system does not require a flywheel oscillator at the remote end, making it possible to evaluate optical frequencies even in laboratories, where no stable microwave reference, such as an Rb clock, a Cs clock, or a hydrogen maser exists. The system is established by the integration of several systems: a portable carrier-phase two-way satellite frequency transfer station and a microwave signal generation system by an optical frequency comb from an optical clock. The measurement was as quick as a conventional method that employs a local microwave reference. We confirmed the system uncertainty and instability to be at the low 10-15level using an Sr lattice clock.
authors.forename: Miho
authors.initials: M
authors.lastname: Fujieda
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Ido
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Hachisu
authors.forename: Tadahiro
authors.initials: T
authors.lastname: Gotoh
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Takiguchi
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Hayasaka
authors.forename: Kenji
authors.initials: K
authors.lastname: Toyoda
authors.forename: Kenji
authors.initials: K
authors.lastname: Yonegaki
authors.forename: Utako
authors.initials: U
authors.lastname: Tanaka
authors.forename: Shinji
authors.initials: S
authors.lastname: Urabe