Fiber-based multiple-access ultrastable radio and optical frequency dissemination

We demonstrate a fiber-based multiple-access ultrastable frequency dissemination scheme for both radio frequency modulated on the optical carrier and optical frequency. Relative frequency stabilities of 7 × 10^-14/s and 5 × 10^-18/day for radio frequency, 3 × 10^-16/s and 4 × 10^-18/10⁴s for optical frequency have been obtained, respectively. Using this method, highly synchronized radio-frequency modulation signal or the optical signal itself can be regenerated along the entire fiber link and it is expected to have potential applications.