Nonlinear damage compensation method suitable for high-speed coherent polarization multiplexing system

A technology of nonlinear damage and polarization multiplexing, applied in the transmission system, electromagnetic wave transmission system, electromagnetic receiver, etc., can solve the problems of unsatisfactory compensation effect and complicated nonlinear damage compensation process

Active Publication Date: 2021-09-07
LIAOCHENG UNIV
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  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the nonlinear damage compensation method suitable for high-speed coherent polarization multiplexing systems provided by the present invention solves the problems that the existing nonlinear damage compensation process is complicated and the compensation effect is not ideal

Method used

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  • Nonlinear damage compensation method suitable for high-speed coherent polarization multiplexing system
  • Nonlinear damage compensation method suitable for high-speed coherent polarization multiplexing system
  • Nonlinear damage compensation method suitable for high-speed coherent polarization multiplexing system

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Embodiment 1

[0058] Aiming at the problem of nonlinear damage compensation in coherent optical systems, the present invention proposes a nonlinear damage compensation method based on label propagation algorithm (Label propagation algorithm, LPA), which is suitable for polarization multiplexing (Polarization Division Multiplexing, PDM) 16QAM, PDM -32QAM and PDM-64QAM and other modulation formats, such as figure 1 As shown, the method first processes the received signal through DSP processing such as resampling, dispersion compensation, time phase recovery, polarization demultiplexing, frequency offset and carrier phase recovery, and the method of the present invention is placed after the carrier phase recovery module, and proposes A nonlinear impairment compensation method suitable for high-speed coherent polarization multiplexing systems. The core idea of ​​this method is to use the label propagation algorithm to realize the re-judgment of the received symbols based on the characteristics o...

Embodiment 2

[0090] In order to verify the effectiveness of the present invention, verify from two aspects of simulation and experiment in this embodiment:

[0091] In terms of simulation, using VPI and MATLAB to build such Figure 9The coherent optical transmission system shown can perform high-speed coherent polarization multiplexing single-carrier and WDM system simulation. The width is 100MHz and 100KHz respectively. The simulation system uses an optical switch to switch the optical link between single-channel and multi-channel transmission. The input power ranges from -7dBm to 4dBm, increasing by 1dB each time. In the optical fiber loop, we use a single-mode optical fiber with a span of 100km, the loss coefficient is 0.2dB / km, the dispersion coefficient is 17ps / (nm·km), the polarization mode dispersion is 0.2ps / √km, and the nonlinear coefficient is 1.3W -1 / km. Thereafter, an EDFA with a noise figure of 4dB is used to compensate the loss of the fiber link and introduce ASE noise....

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Abstract

The invention discloses a non-linear damage compensation method suitable for a high-speed coherent polarization multiplexing system, which utilizes the characteristic that a label propagation algorithm (LPA) can generate a non-linear judgment boundary to re-judge a received symbol so as to achieve the purpose of compensating non-linear damage. In a digital signal processing flow of a receiving end, coordinates of m standard constellation points are determined according to an m-order quadrature amplitude modulation format, a unique label is given, output data of a carrier phase recovery module is set as label-free data, and label conditions of surrounding data are checked according to a preset view radius. The method comprises the following steps of: classifying data, changing a self label state in real time according to a majority principle, endowing all label-free data with a unique label after multiple iterations, and finally calculating reflection and bit error rate according to a reclassification result. Through dual verification of simulation and experiments, the method has a remarkable compensation effect on nonlinear damage of various modulation formats at different distances in a high-speed coherent polarization multiplexing system.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a nonlinear damage compensation method suitable for high-speed coherent polarization multiplexing systems. Background technique [0002] Optical fiber communication is considered to be the cornerstone of network information transmission, carrying more than 90% of global data communication, and the global information flow is currently growing at an explosive rate of 60% per year, far exceeding the growth rate of optical fiber communication system transmission capacity, so It is imminent to further increase the capacity of optical fiber communication system. For the fiber channel, the unfavorable factors affecting the system capacity include both linear damage and nonlinear damage. Linear damage mainly includes fiber loss, dispersion and polarization damage. These damages have been well compensated by technologies such as Erbium-doped Fiber Amplifier (EDFA), fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/61
CPCH04B10/6163
Inventor 白成林李保堃吕修华罗雪源王志国许恒迎杨立山孙伟斌于新阔赵如清周唐磊
Owner LIAOCHENG UNIV
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