Optical network fault detection device based on noise signals and detection method thereof

A technology for noise signal and fault detection, applied in optical network fault detection device and its detection field, can solve problems such as low resolution and complex structure, and achieve the effects of high spatial resolution, simplified device and convenient operation

Active Publication Date: 2012-09-19
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0009] The present invention provides a noise signal-based optical network fault detection device and its detection method to solve the problems of pulse modulation, complex structure and low resolution in the prior art for passive optical network detection using noise

Method used

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  • Optical network fault detection device based on noise signals and detection method thereof
  • Optical network fault detection device based on noise signals and detection method thereof
  • Optical network fault detection device based on noise signals and detection method thereof

Examples

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no. 1 example

[0032] An optical network fault detection device based on a noise signal is implemented in the present invention, and the device is suitable for a wavelength division multiplexed passive optical network.

[0033] Such as figure 1 As mentioned above, a schematic diagram of the structure of the passive optical network is given, wherein the optical line terminal OLT emits communication signals, and the signals are distributed through the communication wavelength division multiplexer in the optical distribution network unit ODN, and the distributed signals pass through the network The target path enters the optical network subscriber unit ONU.

[0034] Such as figure 2 As mentioned above, a passive optical network detection device of the present invention is located at the OLT side and includes a noise source and a signal processing unit.

[0035] Such as image 3 Said, the noise source 1 of the present invention comes from the amplified spontaneous emission (ASE) noise o...

no. 2 example

[0039] On the basis of the first embodiment, the second embodiment such as Figure 4 As mentioned above, the signal processing unit is composed of a coupler I2, a reflective tunable filter 9, a photodetector I4, an A / D converter I6 and a signal processing device 8. Among them, one reference signal is filtered by the reflective adjustable filter 9 and then enters the photodetector I4 through the coupler I2, and the positioning is realized by performing an autocorrelation operation on the collected signal, and the other is the same as the first embodiment. In this embodiment, the transmissive tunable filter 3 is replaced by a reflective tunable filter 9, which can make the structure of the signal processing unit simpler than that of the first embodiment.

no. 3 example

[0041] On the basis of the first embodiment, the third embodiment such as Figure 5 As mentioned above, the signal processing unit is composed of coupler I2, coupler II10, transmission tunable filter 3, photodetector II5, A / D converter II7 and signal processing device 8. The reference signal and the returned detection signal are coupled into one signal through the coupler I2 and the coupler II10, and the collected signal is subjected to an autocorrelation operation, and the others are the same as the first embodiment. In this embodiment, the structure is simplified by coupling optical paths without replacing the transmissive tunable filter 3 .

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Abstract

Provided are an optical network fault detection device based on noise signals and a detection method thereof. The device is characterized in that a noise source and a signal processing unit are arranged in a main optical fiber between an optical line terminal and an optical distribution network unit. The noise source includes spontaneous radiation noise amplified by an online optical amplifier or introduced noise signals and is located on the side of the optical line terminal. The method includes utilizing spontaneous radiation noise amplified by the optical amplifier in an optical fiber main line or introduced noise signals, conducting detection by coupling a wavelength division multiplexer into branches of the optical network, filtering optical signals of corresponding branches to be detected through a reflection type adjustable filter, conducting relative processing on returned detection signals and reference signals in the signal processing unit and achieving fault location through relative peak value of relative curves. The device and the method utilize noise wideband characteristics to achieve proper online location detection of the wavelength division multiplexing passive optical network, and are simple in structure, convenient to operate and accurate in optical network fault detection.

Description

technical field [0001] The invention relates to an optical network fault detection device and a detection method thereof, more specifically, an optical network fault detection device and a detection method using noise signals. Background technique [0002] Among various broadband access technologies, Passive Optical Network (PON) has become one of the hot technologies today due to its advantages of large capacity, long transmission distance, low cost, and full service support. PON is a point-to-multipoint network, mainly including three parts: optical line terminal OLT, optical distribution network ODN and optical network user unit ONU. Due to the multi-branch topology of PON, it brings great challenges to the detection of network faults. In order to ensure the stability of the optical fiber network, it is particularly important to quickly and accurately locate faults in the line. [0003] Existing optical network fault detection mainly uses a single-wavelength Optical ...

Claims

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Application Information

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IPC IPC(8): H04B10/08H04Q11/00H04B10/075
Inventor 王云才王安帮赵彤阚杰王娜
Owner TAIYUAN UNIV OF TECH
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