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Filter construction method and device and nonlinear noise suppression method and system

A construction method and filter technology, applied in the field of optical transmission, can solve problems such as poor compensation effect, and achieve the effect of reducing complexity

Active Publication Date: 2017-02-22
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But due to the complexity of the DBP algorithm, the compensation effect is not good

Method used

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  • Filter construction method and device and nonlinear noise suppression method and system
  • Filter construction method and device and nonlinear noise suppression method and system
  • Filter construction method and device and nonlinear noise suppression method and system

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Experimental program
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Effect test

Embodiment 1

[0075] This embodiment discloses a method for constructing a filter, including the following steps:

[0076] S1) The transmitting end sends the check sequence, and the data signal is modulated by the MZ modulator and then multiplexed into the optical fiber channel, and then demultiplexed and coherently received after being transmitted across the M span to obtain a coherent detection data signal;

[0077] S2) Use the DBP algorithm to establish a reverse virtual optical fiber link according to the principle of "first in, last out", perform dispersion compensation and nonlinear compensation on the coherent detection data signal, and add an optical attenuator to attenuate the optical signal before each span compensation ; The block diagram of each span DBP algorithm is as follows Figure 8 shown.

[0078] S3) Repeat the above steps S1) and S2) to obtain the influence coefficient of different interference channels on the target channel, including the influence coefficient of self-...

Embodiment 2

[0126] The embodiment of the present invention discloses a device for constructing a filter using the method of Embodiment 1, including:

[0127] The coherent detection signal acquisition module is used for the transmitting end to send the inspection sequence. The data signal is modulated by the MZ modulator and then multiplexed into the optical fiber channel. After the M span transmission, it is demultiplexed and coherently received to obtain the coherent detection data signal;

[0128] The coherent detection signal compensation module is used to use the DBP algorithm to establish a reverse virtual optical fiber link according to the principle of "first in, last out", to perform dispersion compensation and nonlinear compensation on the coherent detection data signal, and to add optical attenuation before each span compensation The device attenuates the optical signal;

[0129] The DSP processing module is used to obtain the influence coefficient of different interference chan...

Embodiment 3

[0135] The embodiment of the present invention discloses a nonlinear noise suppression method using the filter construction method of Embodiment 1, including:

[0136] The DBP algorithm is used to establish a reverse virtual optical fiber link according to the principle of "first in, last out". For the coherent detection data signal, the channel compensation filter based on carrier correlation adaptation is used to calculate the XPM phase noise compensation value under different channels. The XPM phase noise is compensated.

[0137] Further, the channel compensation filter based on carrier correlation adaptation is:

[0138]

[0139] in, is the XPM phase noise caused by different interfering channels to the target channel, ω k -ω s is the channel spacing, {b 0} is the transmission sequence of the interference channel, L is the transmission distance, γ is the nonlinear coefficient, β 2 is the second-order dispersion parameter.

[0140] Specifically, before optical sig...

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Abstract

The invention discloses a filter construction method and device and a nonlinear noise suppression method and system. The inter-channel nonlinear damage caused by XPM in an optical fiber transmission system is obtained by using the first order perturbation theory based on a Gaussian noise model (GN). A channel compensation filter which is relevant to channel spacing and interference channel transmitting sequences and based on carrier relevant adaptation is constructed according to the size of the influence of channels under different frequencies on the center channel. The power of different channels in an optical fiber channel model can be dynamically allocated, and nonlinear noise can be compensated according to the principle of a digital reverse transmission algorithm. The nonlinear influence of all the interference channels on the center channel does not need to be calculated so that the complexity of a compensation DBP algorithm can be effectively reduced.

Description

technical field [0001] The present invention relates to the field of optical transmission technology in the field of communication technology, in particular to a method for constructing a channel compensation filter based on carrier correlation adaptation, and a method and system for suppressing non-linear noise between channels. Background technique [0002] In recent years, with the rapid development of high-definition, 3D, ultra-high-definition and other video technologies, the explosive growth of business demand for big data, cloud computing, and cloud storage has put forward higher requirements for the transmission distance and capacity of optical fiber systems. Therefore, ultra-high-speed long-distance optical fiber Transmission has become one of the domestic research hotspots, and people have been moving towards the goal of faster speed and longer distance. [0003] Every breakthrough in transmission capacity and transmission distance always comes from the adoption of...

Claims

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Application Information

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IPC IPC(8): H04B10/2513H04B10/079
CPCH04B10/07951H04B10/25133
Inventor 刘博忻向军张丽佳张博张琦田清华田凤李博文
Owner BEIJING UNIV OF POSTS & TELECOMM
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