OTN SYSTEM AND METHOD FOR SUPPORTING SINGLE-FIBER BIDIRECTIONAL TRANSMISSION OF SUPERVISORY CHANNEL LIGHT

摘要

Disclosed are an OTN (Optical Transport Network) system and method for supporting single-fiber bidirectional transmission of supervisory channel light, which relate to the field of OTN networks. The system comprises an upstream site and a downstream site. Two optical amplification units and one optical supervisory channel unit are disposed in each site, each site further comprises a combining and splitting unit comprising an optical circulator and a combining and splitting device, an output of the optical supervisory channel unit is connected to an upper port light path of the optical circulator, and a common port of the optical circulator is connected to a light path of the combining and splitting device, and a lower port of the optical circulator is connected to an input light path of the optical supervisory channel unit; the combining and splitting devices of the two sites are connected through two optical fibers, wherein one of which comprises supervisory channel light and forward traffic light transmitted in a bidirectional way and the other comprises backward traffic light. In the present invention, an out-of-band mode is adopted for the transmission of IEEE1588V2 protocol messages to enable transmission and reception of light with the wavelength of the supervisory channel light in one optical fiber, thus avoiding the asymmetry between transmission and reception paths and guaranteeing the consistency of transmission and reception delays.