53 results about "Delay equalization" patented technology

The invention discloses an automatic optical fiber transmission delay locking and equalization method applicable to optical fiber communication networks. Under the SDH (Synchronous Digital Hierarchy) system of conventional optical fiber transmission devices, by adding a zero-attenuation program-controllable optical fiber delay equalization network, in combination with an on-line optical fiber delay monitoring technique, the method reasonably chooses C mark and a time interval code Txk corresponding to C mark, a round trip comparison phase locking technique is utilized to separate out the change of an optical fiber delay value between a master station and a slave station in order to eliminate the adverse affection of the change of the optical fiber delay value on time and frequency synchronization, a three point-to-one point accurate measurement algorithm is adopted to constantly control the change of the optical fiber delay within an extremely narrow range, and thereby high-precision time and frequency synchronization is realized. The method provided by the invention is applied in combination with the on-line optical fiber delay monitoring technique, and can firmly control the delay change of optical fiber transmission within a range less than or equal to (1ns/day to 2ns/day to 5ns/day to 10ns/day).