Time synchronization apparatus and method for automatically detecting the asymmetry of an optical fiber

摘要

A time synchronization apparatus and method for automatically detecting the asymmetry of an optical fiber. The apparatus comprises an OTDR asymmetry detecting module (12), a time delay compensating module (14) and a time synchronization correcting module (16), the OTDR asymmetry detecting module (12) comprises an emitting unit (122) used for emitting a detection signal to the optical fiber, a receiving unit (124) used for receiving the detection signal returned by the optical fiber, a transmission time delay determining unit (126) used for determining the transmission time delay of the detection signal in the optical fiber according to the time difference between the emitting detection signal and the returned detection signal, and the determining transmission time delay of a service signal in the optical fiber according to the transmission time delay of the detection signal; The time delay compensating module (14) is used for calculating asymmetric time delay value between the first optical fiber and the second optical fiber according to the transmission time delay of the first optical fiber and the transmission time delay of the second optical fiber; The time synchronization correcting module (16) is used for synchronization correcting time according to the asymmetry time delay. The apparatus and method can improve the time synchronism precision.

主权项

1. A clock synchronization apparatus with automatic optical fiber asymmetry detection, comprising an Optical Time Domain Reflectometer (OTDR) asymmetry detecting module, a delay compensating module, and a clock synchronization correcting module, wherein
the OTDR asymmetry detecting module comprises: a transmitting unit configured for transmitting a detecting signal in an optical fiber; a receiving unit configured for receiving an echo of the detecting signal returned by the optical fiber; and a transmission delay determining unit configured for determining a detecting signal transmission delay for transmission of the detecting signal in the optical fiber according to a lag between transmitting the detecting signal and receiving the echo of the detecting signal, and determining a service signal transmission delay for transmission of a service signal in the optical fiber according to the detecting signal transmission delay; the delay compensating module is configured for computing an asymmetric delay between a first optical fiber and a second optical fiber according to a first service signal transmission delay for transmission of the service signal in the first optical fiber and a second service signal transmission delay for transmission of the service signal in the second optical fiber; and the clock synchronization correcting module is configured for performing clock synchronization correction according to the asymmetric delay.