Optical Time Domain Detector Optical Module and Gigabit Passive Optical Network Breakpoint Detection System

Abstract

The invention discloses breakpoint detection system of an optical module of an optical time domain reflectometer (OTDR) and a gigabit passive optical network (GPON). The breakpoint detection system of the optical module of the OTDR and the GPON comprises an optical line terminal (OLT), an optical splitter, an optical network unit (ONU) and an optical module of the OTDR. The OLT is connected with the optical module of the OTDR, and the optical module of the OTDR is connected with the light splitter. The optical module of the OTDR is used for receiving optical signal with second longest wavelength outputted by the ONU, and transmits the optical signal to the OLT. The optical signal with the third longest wavelength is generated and is outputted. The optical signal with the third longest wavelength returned by rayleigh scattering and fresnel reflection is received, signal processing is carried out on the returned optical signal, and breakpoint information is obtained according to the signal processing result. According to the breakpoint detection system of the optical module of the OTDR and the GPON, braking point detection procedure is simplified, and normal transmission of system network signal is ensured.

Description

technical field [0001] The present invention relates to optical fiber communication technology, in particular to an Optical Time Domain Reflectometer (OTDR, Optical Time Domain Reflectometer) optical module and a Gigabit Passive Optical Network (GPON, Gigabit Passive Optical Network) breakpoint detection system. Background technique [0002] In the current domestic market and international market, the direction of optical fiber communication with high bandwidth, high speed and multi-service integration has begun to be applied; among many solutions, the emergence of Fiber To The Home (FTTH, Fiber To The Home) is considered to be the most important aspect of broadband The ultimate solution for access has been widely used in the domestic market. [0003] Among the many FTTH solutions, GPON has attracted much attention and has become the mainstream optical access method at present. In the GPON system, the optical transmission medium, such as optical fiber / optical cable, is ofte...

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Problems solved by technology

[0012] It can be seen from the above that the existing GPON breakpoint detection system based on the optical time domain detector for fiber breakpoint detection needs to disconnect the existing GPON system first, and then connect the OTDR to the breakpoint during the breakpoint detection process. The detection system transmits light pulses into the optical fiber through the OTDR, and uses the Rayleigh scattering and Fresnel reflection information of the light pulses for detection. The breakpoint detection process is relatively complicated; further, during the detection period, the OLT needs to be disconnected, which affects Normal transmission of other network signals without breakpoints

For example, in the above example, when the optical fiber between the spilter and ONU3 is broken, the OLT needs to be disconnected from the network during the detection period, thereby causing the interruption of the signal transmission and reception of ONU1 and ONU2, which affects the normal operation of the GPON system; Moreover, in the case of frequent failures in the GPON system, it is necessary to frequently disconnect the OLT and plug in the OLT, and the frequent plug-in operation reduces the reliability of the OLT.

[0013] To sum up, in the GPON breakpoint detection system of the prior art, the detection process is relatively complicated during the breakpoint detection process, and it will affect the normal transmission of other network signals without breakpoints.

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