PON (passive optical network) line fault monitoring method and device based on optical mark method

Abstract

The invention discloses a PON line fault monitoring method and device based on an optical mark method. The device comprises a monitoring system, a wavelength selector, a 1: 2 optical fiber coupler, a 1: N optical branching device and N FBGs (fiber bragg grating). The distance between the FBG connected in series to every optical fiber branch and the optical branching device is different, so that the transmission time of narrow-band monitoring pulses, which are transmitted by a laser light source, on every optical fiber branch is different, and further the monitoring pulses on the optical fiber branches can be arranged in sequence in time domain. Due to the fact that the monitoring pulses arriving at the branches are marked in time domain to distinguish feedback signals of different lines, the method is called as the optical mark method. An upper computer compares received monitoring pulse data with original data and determines the on-off state of the corresponding branch through the existence and inexistence of certain pulses. The PON line fault monitoring method and device effectively overcomes the difficulty that an OTDR (optical time domain reflectometry) cannot support multi-branch network monitoring; is a simple and practical real-time monitoring method for large-branch-ratio optical network lines; and has the advantages of high precision and operation convenience.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to a PON line fault monitoring method based on an optical marking method and a device thereof. Background technique [0002] "Fiber into copper back" is an inevitable trend in the development of broadband access technology. With the expansion of PON (Passive Optical Network, Passive Optical Network) coverage, real-time monitoring of its line faults becomes particularly important. PON has the characteristics of many line branches, complex structure and easy to be affected by the geographical distribution of users, which increases the complexity of its line maintenance and management. The splitting ratio of the next-generation PON technology will reach 1:128, and there is an urgent need for an optical layer automatic monitoring solution that effectively supports networks with a large splitting ratio. Optical fiber line faults account for a large propo...

AI Technical Summary

Problems solved by technology

Although the device can also detect the disconnection of the optical fiber loop in the passive optical network PON system, but in the case of many optical fiber branches, fiber gratings with different reflection wavelengths are placed, which will limit the performance of the passive optical network PON. System user capacity

In addition, this monitoring method depends on the measurement accuracy and wavelength range of the optical power meter, and has high requirements on the performance of the optical power meter. Therefore, if an optical power meter with a single function can extract each The corresponding monitoring data of the optical fiber loop is quite difficult

This solution will gradually reduce its accuracy and operability with the increase of the optical fiber loop in the passive optical network PON system

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