Multi-branch monitoring technology of PON based on OTDR

Abstract

In this paper, we use the experimental data to verify the technology of Optical Time Domain Reflectometry (OTDR) to realize multi-branch fault monitoring in PON access network. Then the monitoring effects of the two optical splitter structures are analyzed in detail, and the dynamic monitoring of different fault degrees is realized. We prepared single-mode optical fibers, with the length of 10.282 km, 10.768 km, 14.45 km, 25.2 km and 50.38 km respectively. Optical attenuators with different optical attenuation values, like 5 dB and 2 dB, respectively corresponding to different fault degrees of optical fiber link. The fault monitoring of branches with similar distance is analyzed, and the influencing factors such as pulse width are analyzed in detail. In experiments, it can be found that the selection of scanning pulse width has little impact on the identification of event position, but when two adjacent events fold each other due to the increase of attenuation dead zone, the identification of event position cannot be realized. It is believed that these research data can provide valuable reference for the management and maintenance of optical fiber in the actual PON network, and provide valuable data for the promotion of this new technology.

Dynamic fault monitoring method for passive optical network

“…1, refer to the previous report. 18 The OTDR instrument (EXFO, FTB-730C) used in the experiment has two scanning modes, namely SM mode and SM live mode. The test wavelength of SM mode is 1310 and 1550 nm, whereas that of SM live mode is 1625 nm.…”

“…The experimental setup is shown in Fig. 1, refer to the previous report 18 . The OTDR instrument (EXFO, FTB-730C) used in the experiment has two scanning modes, namely SM mode and SM live mode.…”