Light module of light time domain reflector, light time domain reflector and fibre-optical testing method

Abstract

The invention consists of pulsed laser and light receiving converter. The pulsed laser is used to emit laser pulse with constant optical power. The light receiving converter comprises optical-electrical converter, amplifying circuit used to amplify the electrical signal above and the A / D converter used to convert the electrical signal into digital signal. The amplifying circuit above comprises at least two amplifying stages and stage switch used to complete segmented amplification of dynamic range.

Description

technical field [0001] The invention relates to optical fiber testing technology, in particular to an optical time domain reflectometer, an optical module thereof and an optical fiber testing method applied to the optical time domain reflectometer. Background technique [0002] With the development of optical fiber communication technology, since the 1980s, the optical fiberization of the network has been one of the main trends in the development of networks in all countries in the world. At present, the composition of communication networks in various countries is mainly based on optical fiber network as the transmission basis. When constructing and maintaining optical cable lines, OTDR (Optical Time Domain Reflectometer, optical time domain reflectometer) must be used to test the characteristics of optical fiber. OTDR is also an optical fiber The core technology in the online monitoring system of the network, the larger the dynamic range, the larger the distance and range ...

AI Technical Summary

Problems solved by technology

[0007] The prior art can be used for OTDR with high dynamic range, but its disadvantage is that the utilization rate of test results is low, which indirectly reduces the dynamic range

[0009] N1 and N2 are different average times, therefore, since the average number of tests is reduced to 1 / 3 of the original, the dynamic range is reduced

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