Optical fiber testing method, device and passive optical network system

Abstract

The embodiment of the invention discloses an optical fiber testing method and a device thereof, which relate to the technical field of optical communication. The optical fiber testing method includes: receiving a test optical signal from an optical fiber network, and converting the test optical signal into a test current signal; the transimpedance amplifier adopts a first working mode to receive the test current signal and output a first test voltage signal ; Obtain the swing of the first test voltage signal, and determine whether the swing of the first test voltage signal satisfies a preset condition; when the swing of the first test voltage signal satisfies the preset condition, The transimpedance amplifier adopts the second working mode to receive the test current signal and output the second test voltage signal, wherein the upper limit and lower limit of the receiving dynamic range when the transimpedance amplifier works in the first working mode and the upper limit and lower limit of the receiving dynamic range when the transimpedance amplifier works in the first working mode; The two working modes are different. The embodiment of the present invention also provides a passive optical network system.

Description

technical field [0001] The present invention relates to the field of optical fiber testing, in particular to an optical fiber testing method, device and passive optical network (Passive Optical Network, PON) system. Background technique [0002] At present, with the acceleration of optical input and copper output, the construction of passive optical networks is developing rapidly, and PON needs to be installed, accepted and maintained. Positioning and exclusion play an important role. [0003] Since the OTDR needs to be able to detect very weak and very strong test signals, the transimpedance amplifier (Transimpedance Amplifier, TIA) in the OTDR system is required to have high sensitivity and large receiving dynamic range. When the signal is strong, the reception is saturated. On the other hand, due to the limitation of the existing power supply capacity, the receiving dynamic range of the TIA cannot be further increased. Therefore, the detection range of the OTDR test sign...

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Problems solved by technology

[0003] Since the OTDR needs to be able to detect very weak and very strong test signals, the transimpedance amplifier (Transimpedance Amplifier, TIA) in the OTDR system is required to have high sensitivity and large receiving dynamic range. When the signal is strong, the reception is saturated. On the other hand, due to the limitation of the existing power supply capacity, the receiving dynamic range of the TIA cannot be further increased. Therefore, the detection range of the OTDR test signal in the prior art is relatively small

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