Method and system for high-precision long-distance distributed fiber-optic time transfer

摘要

A method and system for high-precision long-distance distributed fiber-optic time transfer. The system comprises a first clock source, a first fiber-optic time transfer unit, N relay and user units, M bidirectional optical amplifying units, a second fiber-optic time transfer unit, and a second clock source. Each relay and user unit obtains timing signals synchronized with the first clock source according to time interval between received forward and backward timing signals and realize distributed fiber-optic time transfer while realizing optical-electric-optical relay of forward and backward transmitted optical signals. Bidirectional time signals pass through the same link to ensure maximum symmetry of the main link bidirectional delay; effect of multiple optical amplifications of noise, such as Rayleigh scattering, on stability of fiber-optic time transfer is avoided by optical-electric-optical process; distributed time transfer is realized by bidirectional timing signal time interval received by the relay and user units.