ONU state tester for passive optical network test

Abstract

The invention discloses an ONU state tester for a passive optical network test. The ONU state tester for the passive optical network test is composed of a 2*2 optical branching device, an optical power measurement module, an optical time domain reflectometer, an emergency signal optical power measurement module and a comprehensive processing unit module. A port S3 of the 2*2 optical branching device is connected to the optical power measurement module, a port S4 is connected to the optical time domain reflectometer and the emergency signal optical power measurement module, and the comprehensive processing unit module is connected with the optical power measurement module, the optical time domain reflectometer and the emergency signal optical power measurement module. The ONU state tester for the passive optical network test has the advantages that only one instrument is needed, the function that power of each optical signal of a passive optical network can be measured and the function that optical fiber circuit breaking points are measured can be achieved, under the condition that a maintainer does not enter a house of a user, the ONU state of the passive optical network can be tested, and the maintenance efficiency is high; a receiving circuit is shared by 1310 nm emergency signal optical power measurement and optical time domain reflectometer measurement; an amplifier with the small bandwidth is used.

Description

technical field [0001] The invention relates to an optical communication tester, in particular to an ONU state tester for passive optical network testing. Background technique [0002] With the popularity of fiber-to-the-home, the workload of passive optical network maintenance is increasing. The most difficult part of passive optical network maintenance is the last mile. In the passive optical network, the ONU is often placed in the user's home. In many cases, it is inconvenient for maintenance personnel to enter the home to test and inspect the ONU. [0003] Currently, the commonly used instruments for maintaining passive optical networks are PON optical power meters and optical time domain reflectometers. The PON optical power meter can test the 1490nm signal optical power from the OLT direction and the 1310nm burst signal optical power from the ONU direction; the optical time domain reflectometer can test the working status of the optical fiber line. [0004] At presen...

AI Technical Summary

Problems solved by technology

[0004] At present, the PON optical power meter and optical time domain reflectometer are two independent instruments, and they cannot directly and accurately give the working status of the ONU

For example: when using a PON optical power meter to test that there is no optical power from the 1310nm signal, the maintenance personnel cannot determine whether it is because the fiber is broken or because the ONU is powered off, or because the ONU is not connected to the fiber

The optical time domain reflectometer can be used to test whether the optical fiber line is normal, but it cannot directly distinguish whether the ONU is in a power-off state or not connected to the optical fiber line, and the optical time domain reflectometer cannot judge whether the ONU is faulty

[0005] At present, when measuring the optical power of 1310nm burst signals, the methods adopted are as described in the publication numbers CN1833384 "Method and Device for Testing Optical Networks" and CN201409137 "Optical Power Meters for Testing Passive Optical Networks", which need to use a wide bandwidth The amplifier measures the pulse peak amplitude of the pulsed optical signal after amplifying the signal, and the circuit design is more complicated

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