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The Determination Method of Optimal Step Size in Digital Rear Projection Algorithm for Optical Fiber Transmission Loss Compensation

A technology of optical fiber transmission and determination method, which is applied in the direction of optical fiber transmission, transmission system, electromagnetic wave transmission system, etc., can solve the problem that the nonlinear effect compensation effect is not optimal, and achieve the best effect of optical fiber damage

Active Publication Date: 2018-05-11
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

Using the general DBP algorithm with a fixed step size, the step size of each step remains unchanged, and the compensation effect for nonlinear effects is not optimal.

Method used

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  • The Determination Method of Optimal Step Size in Digital Rear Projection Algorithm for Optical Fiber Transmission Loss Compensation
  • The Determination Method of Optimal Step Size in Digital Rear Projection Algorithm for Optical Fiber Transmission Loss Compensation
  • The Determination Method of Optimal Step Size in Digital Rear Projection Algorithm for Optical Fiber Transmission Loss Compensation

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0028] Such as figure 1 As shown, in the present invention, the method for determining the optimal step size in the digital rear projection algorithm of optical fiber transmission loss compensation specifically includes the following steps:

[0029] S101. According to the nonlinear Schrödinger equation of optical fiber transmission, since the light field envelope transmitted by light in the optical fiber is an independent variable A, the coordinate system is composed of time t and the transmission distance z of light in the optical fiber. Therefore, make t a The transformation of , where T is the new amount of time obtained after the transformation of t, β 1 is the first-order dispersion of the fiber, v g is the group velocity of light propagating in the optical fiber, that is to say, it introduces a change amount of the group velocity as ...

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Abstract

A determination method of an optimum step in a digital rear projection algorithm of optical fiber transmission loss compensation relates to the optical fiber communication field. A change amount whose group speed moves a position along with a pulse is introduced into a time variable of an optical fiber transmission nonlinearity Schrodinger equation NLSE. Variable substitution is performed on the Schrodinger equation. And then, for the converted Schrodinger equation, a split-step Fourier transform is used to realize a digital rear projection DBP algorithm. In the digital rear projection DBP algorithm, an envelope index curve of oblique line pair optical pulse transmission is used to carry out fitting, one segment of oblique line is used to approximate each step, and a group with the smallest difference of a fitting curve slope formed by the oblique lines and an index curve slope is selected to be served as the step of the algorithm, which is optimum step distribution. In the invention, different optical power positions correspond to different steps so as to acquire an optimum transmission loss compensation effect.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a method for determining the optimum step size in a digital rear projection algorithm for optical fiber transmission loss compensation. Background technique [0002] With the rapid growth of bandwidth demand and the rapid development of optical fiber communication technology, the transmission capacity of optical fiber communication system is approaching the Shannon limit, and one of the main factors limiting the transmission capacity of optical fiber is the nonlinear effect of optical fiber. It is considered to be a good way to use a powerful DSP (digital signal processing, digital signal processing) at the receiving end to compensate damage caused by nonlinear effects. Among them, the DBP (digital backward propagation, digital back propagation) technology has received great attention due to its advantages of being able to compensate both linear and nonlinear damages of...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/2513H04B10/2543
CPCH04B10/2513H04B10/2543
Inventor 李蔚余少华
Owner WUHAN POST & TELECOMM RES INST CO LTD
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