Passive optical fiber detection method

Abstract

The invention discloses a passive optical fiber detection method. An optical splitter is included, reflected light of the detection light is transmitted to the fault detection device through the branch optical fiber, the shunt router, the multimode coupler, the shunt coupler and the trunk optical fiber in sequence; the fault detection device carries out optical fiber fault detection according to the detected reflected light, the optical splitter works through a backward Rayleigh scattering signal generated in the detected optical fiber, and the test items are the length of the optical fiber, the attenuation of the optical fiber, the fault point of the optical fiber and the joint loss of the optical fiber. All optical fiber faults, including branch optical fibers, of the passive optical network are detected at the OLT; according to the invention, the operation and maintenance cost of an operator can be greatly reduced, the construction of a flexible optical transmission network is facilitated, users can share optical fibers and OLT optical transceiver equipment, the sealing detection of a plurality of passive optical fiber sensors is realized, the design is novel, and a good innovative scheme is provided.

Description

technical field [0001] The invention relates to optical fiber network transmission technology, in particular to a passive optical fiber detection method. Background technique [0002] Passive Optical Network (PON) is an optical fiber network without any electronic devices and electronic power supply. Compared with active optical access technology, PON eliminates the active equipment between the central office and the user end. , simple maintenance, high reliability, low cost, and can save fiber resources, it is the main solution for FTTH in the future. [0003] PON consists of three parts: optical line terminal (OLT), optical distribution network (ODN) and optical network unit (ONU). The OLT is located at the local exchange office or at the remote end, provides a network interface for the ODN and is connected to one or more ODNs, and its function is to provide the necessary transmission mode for the services required by the ONU; the ODN is located between the ONU and the OL...

AI Technical Summary

Problems solved by technology

The OLT is located at the local exchange office or at the remote end, provides a network interface for the ODN and is connected to one or more ODNs, and its function is to provide the necessary transmission mode for the services required by the ONU; the ODN is located between the ONU and the OLT, and all of them are composed of passive components Composition, with passive distribution function; ONU is located on the user side, provides the user-side interface and is connected to the ODN, generally in the building or the user's home, used to realize the user access of the optical access network, the passive optical network is a pure media network, The network transparently transmits services, and the bandwidth is not limited. It is easy to upgrade and expand, which is conducive to the access of new services in the future, but it is inconvenient to detect passive optical fibers. Rainwater or water infiltrated underground usually contains impurities and salt, and is often acidic or Alkaline, long-term immersion of the transfer box in water will destroy the outer protection of the bare optical fiber, thereby affecting the transmission of optical signals, and the impact of water will also immediately affect the transmission of optical signals, which cannot meet the needs of society