Method and device for dispersion compensation

A technology of dispersion compensation and dispersion value, applied in the field of optics, can solve the problems of decreased receiving performance, unrecognizable received data, large peak-to-peak value, etc., and achieve the effect of solving data interference and normal and stable working performance

Active Publication Date: 2019-08-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The system performance should be optimal when the dispersion value in the actual system is 0 ps / (nm×km), but due to the existence of noise, if the peak-to-peak value of the curve is used to represent the performance of the module under a specific dispersion value, the dispersion value will be obtained as The peak-to-peak value is the largest at 100ps / (nm×km), and finally the optimal dispersion operating point of the system is misconfigured to 100ps / (nm×km), which causes the receiving side of the optical module to fail to lock to the correct dispersion value, resulting in a decrease in receiving performance or The received data is unrecognizable

Method used

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  • Method and device for dispersion compensation
  • Method and device for dispersion compensation
  • Method and device for dispersion compensation

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Experimental program
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Effect test

Embodiment 1

[0099] like figure 1 As shown, one of the flowcharts of the dispersion compensation method in Embodiment 1 of the present invention, the dispersion compensation method includes the following steps:

[0100] Step S100, collecting a first signal in the time domain received by the dispersion compensation module under a first preset dispersion value.

[0101] It should be noted that the actual signal transmission contains noise interference, and the received first signal in the time domain here contains noise interference.

[0102] Step S200, transforming the first signal in the time domain from the time domain to the frequency domain to obtain a transformed first signal in the frequency domain.

[0103] It should be noted that there are many methods for converting signals from the time domain to the frequency domain. In the embodiment of the present invention, discrete Fourier transform is used to transform the first signal in the time domain collected in step S100 from the tim...

Embodiment 2

[0155] like Figure 7 As shown, it is a schematic diagram of the application of the method of dispersion compensation in the embodiment of the present invention in the twin subracks. The transmitting end of subrack 1 is connected to the receiving end of subrack 2 through the dispersion compensation module; the transmitting end of subrack 2 is connected to the subrack through the dispersion compensation module. The receiving end of rack 1 is connected; the connection line between sub-rack 1 and sub-rack 2 is optical fiber, and the working steps are as follows:

[0156] Step 1: Set the dispersion value of the dispersion compensation module to -700ps / (nm×km).

[0157] Step 2: The dispersion compensation module performs a dispersion scan on the receiving side to obtain a receiving performance curve.

[0158] Step 3: Discrete Fourier transform processing is performed on the performance curve, and energy change processing is performed to obtain a frequency domain energy curve.

[...

Embodiment 3

[0163] like Figure 8 As shown, it is a schematic diagram of the application of the embodiment of the present invention in the remote transmission of a single subrack. When it is necessary to transmit the remote signal to the receiving end of the device A1, the receiving end of the device A1 is connected to the remote signal using an optical fiber, and the sending end of the device A1 Can not connect. After the optical fiber is connected, it does not need to be changed in future use. The implementation of specific steps is shown in Example 2.

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Abstract

A dispersion compensation method and device. The method comprises: collecting first time domain signals received by a dispersion compensation module under a first preset dispersion value and converting the first time domain signals into first frequency domain signals; denoising and processing the first frequency domain signals to obtain frequency domain energy of first data signals; adjusting a dispersion value of the dispersion compensation module to be a second preset dispersion value; collecting second time domain signals received by the dispersion compensation module under the second preset dispersion value and converting the second time domain signals into second frequency domain signals; denoising and processing the second frequency domain signals to obtain frequency domain energy of second data signals; and performing dispersion compensation adjustment on the dispersion compensation module according to the obtained frequency domain energy of the first data signals and the obtained frequency domain energy of the second data signals. By performing filtering and denoising processing on scanning signals, an optimal dispersion point of the dispersion compensation module can be determined and the entire module can correctly work under the optimal dispersion value.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a dispersion compensation method and device. Background technique [0002] During the startup process of the optical module, the dispersion value of the adjustable chromatic dispersion compensation module will be adjusted to make the best dispersion point for the entire module system to ensure that the performance of the optical module reaches the best under this dispersion value. The working process of a typical tunable dispersion compensation module is as follows: Figure 21 As shown, control the tunable dispersion compensation module to scan from -700ps / (nm×km) to +700ps / (nm×km), and query the scanning peak value each time, and set the maximum peak TDC (tunable chromaticdispersion compensation, hereinafter referred to as TDC) value. like Figure 22 As shown, the adjustable dispersion compensation module scans the dispersion value from -700ps / (nm×km) to +700ps / (nm×km) with a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/2513
CPCH04B10/2513
Inventor 毛明旺
Owner ZTE CORP
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