Technique for finding and identifying filters that cut off OTDR lights in front of ONU from a central office

Takaya, Masaaki; Honda, Hiroyasu; Narita, Yoshihiro; Yamamoto, Fujio; Arakawa, Koji

doi:10.1016/j.yofte.2005.11.001

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…At present, the more feasible technology is to use OTDR instrument to realize the monitoring of optical fiber. For the monitoring application of multi-branch in PON network, researchers have also conducted extensive research, integrated the OTDR function on the monitoring board of optical network and installed it in the central office to realize remote monitoring in the point-to-point network topology [10,11]. Thorla et al proposed using multi wavelength and special wavelength to realize separate monitoring of different branches [12,13], but due to the high cost of OTDR instrument with adjustable wavelength, this solution is not particularly practical in the current network.…”

Section: Introductionmentioning

confidence: 99%

Multi-branch monitoring technology of PON based on OTDR

Zhang

Tang

Zhang

et al. 2023

AOPC 2022: Optical Information and Networks

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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.

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Section: Introductionmentioning

confidence: 99%

Multi-branch monitoring technology of PON based on OTDR

Zhang

Tang

Zhang

et al. 2023

AOPC 2022: Optical Information and Networks

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“…Therefore, the latest technical trend is to integrate OTDR on the monitoring board of optical network, and the equipment is installed in the central office, which can realize remote monitoring in the point-to-point network topology. 10,11 As we all know, OTDR instrument uses Rayleigh scattering in optical fiber to realize optical fiber monitoring through statistics and calculation of backscattering intensity in optical fiber. The multi-branch monitoring in PON is very important for the operator's optical network.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the more conventional maintenance method is usually that when a fault occurs, the maintenance personnel use optical time domain reflectometry (OTDR) at the end of the fault branch to determine the fault degree and fault location, but this process often requires complex operation and low timeliness. Therefore, the latest technical trend is to integrate OTDR on the monitoring board of optical network, and the equipment is installed in the central office, which can realize remote monitoring in the point-to-point network topology 10 , 11 . As we all know, OTDR instrument uses Rayleigh scattering in optical fiber to realize optical fiber monitoring through statistics and calculation of backscattering intensity in optical fiber.…”

Section: Introductionmentioning

confidence: 99%

Dynamic fault monitoring method for passive optical network

et al. 2023

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.We experimentally studied a passive optical network dynamic fault monitoring technology based on optical time domain reflectometry (OTDR), focused on various types of network structures with optical splitter (OS) devices, and analyzed the monitoring data with different lengths of fibers in front of the OS, such as 0, 14.5, and 50 km, respectively. Different from previous studies, we found that the new characteristics of echo curve can be used to realize the identification of different fault branches. We also make a detailed analysis on the feasibility of OTDR for multi-branch monitoring and the corresponding situation of instrument parameters. And the similar distance of the event situation is analyzed experimentally. We believe that these research data will provide effective technical reference for the intelligent management of optical networks in the current network.

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Ghost Reflection Processing Method in PON Branch Monitoring Based on OTDR

Zhang

Tang

et al. 2022

2022 IEEE 10th International Conference on Information, Communication and Networks (ICICN)

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Technique for finding and identifying filters that cut off OTDR lights in front of ONU from a central office

Cited by 3 publications

References 3 publications

Multi-branch monitoring technology of PON based on OTDR

Multi-branch monitoring technology of PON based on OTDR

Dynamic fault monitoring method for passive optical network

Ghost Reflection Processing Method in PON Branch Monitoring Based on OTDR

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