System and method for monitoring quality of optical link of passive optical network

Abstract

The invention discloses a system and a method for monitoring the quality of an optical link of a passive optical network. Optical bragg gratings are arranged at the termination positions of each optical link of the passive optical network. An optical fiber analyzer is arranged on the local sides of the optical links, and is connected with each optical link of the passive optical network by a full-cross optical switch and a coupler. The method comprises that: the optical fiber analyzer produces and transmits testing light with testing wavelengths for link monitoring, and the testing light passes through the full-cross optical switch and the coupler, is periodically coupled with light, with working wavelengths, emitted from each port of each optical line terminal (OLT) equipment on the local side in turn, and is output to the optical links of the ports; and the optical fiber analyzer detects the fed-back testing light, extracts testing light data, compares the acquired data of a current port with own normal state data values of the port, and reports alarming and performance events if a variation exceeds a preset redundancy threshold. In the system and the method, centralized and automatic one-stop periodical monitoring is realized in the passive optical network.

Description

technical field [0001] The invention relates to the technical field of passive optical networks, in particular to a system and method for monitoring the quality of an optical path of a passive optical network. Background technique [0002] The composition of the passive optical network (PON, Passive-Optical-Network) mainly includes: the optical line terminal (Optical Line Terminal-OLT) at the central office, the optical network unit (ONU, Optical Network Unit) or the optical network terminal (ONT, Optical Network Terminal), and an optical distribution network (ODN, Optical Distribution Network) for connecting them. Among them, the ODN does not contain any electronic devices and electronic power sources, and is composed of passive devices such as optical fibers, optical cables, and optical splitters (Splitter), and does not require expensive active electronic devices. [0003] Normally, the active optical access network technology is a point-to-point optical fiber transmissi...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is impossible to measure the link quality of multiple optical fibers at once. If you want to detect the status of which optical fiber, you need to manually use an instrument to measure at the test port of the optical cable section. The degree of personnel participation is high, and the operation is time-consuming and laborious. , and it is difficult to quickly understand the end-to-end quality status of all links

In this way, when a fault occurs, since the specific fiber core cannot be determined in advance, the fault measurement and location of each fiber core are performed manually, and the processing speed and complexity are very high.

If the network scale is large or the number of users is large, then this artificial and passive optical link monitoring and obstacle handling method is not only extremely inefficient, but also consumes huge manpower and material resources.

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