The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 2020
Filed:
Feb. 21, 2019
Shanghai Jiao Tong University, Shanghai, CN;
Guiling Wu, Shanghai, CN;
Shanghai Jiao Tong University, Shanghai, CN;
Abstract
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.