Method, system and apparatus for detecting optical fiber fault in passive optical network

Abstract

The invention provides an optical fiber fault detection method in PON. The method comprises: outputting two optical fibers from optical line terminal (OLT) to separately couple all junction boxed, and outputting one optical fiber from the junction boxes to connect an optical network unit (ONU), wherein, the two optical fibers outputted by OLT separately start from a first optical module and a second optical module of OLT, and pass through each junction box to separately return to a first GE optical port and a second GE optical port of OLT; the first GE optical port and the second GE optical port separately detect if light is on the optical fiber connected with the first GE optical port and the second GE optical port, and report detection result to CPU, then CPU determines if the two optical fibers outputted by OLT turn up fault according to the received detection result. Moreover, the invention also provides an optical fiber protection system in PON, a junction box and an OLT. Making use of the technical scheme provided by the invention can improve accuracy of optical fiber fault detection.

Description

technical field [0001] The present invention relates to a passive optical network (PON, Passive Optical Network) technology, in particular to an optical fiber fault detection system and device in a passive optical network. Background technique [0002] PON is a passive optical network with a point-to-multipoint structure. It has the advantages of easy maintenance, high bandwidth, and low cost. It is currently a widely used optical access technology. figure 1 It shows a schematic diagram of the PON structure, mainly including: Optical Line Terminal (OLT, Optical Line Terminal), Passive Optical Splitter (POS, Passive Optical Splitter) and Optical Network Unit (ONU, Optical Network Unit), between OLT, POS and ONU Connected via optical fiber. [0003] Such as figure 1 As shown, PON has the characteristics of single-fiber transmission of bidirectional data and point-to-multipoint. In this case, if the main fiber between OLT and POS fails, it will inevitably cause a large number...

AI Technical Summary

Problems solved by technology

[0005] However, for the first detection method, if the optical fiber is normal, but the ONU has no upstream traffic for a certain period of time, that is, the ONU has no upstream light, it is easy to misjudge the normal optical fiber as a faulty optical fiber; for the second detection If there is no new ONU sending a registration request to the OLT within the discovery window, it is easy to misjudge a normal fiber as a faulty fiber

It can be seen that the accuracy of the existing optical fiber fault detection scheme is low, and it is impossible to achieve accurate detection

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