Adaptive digital signal processing algorithm for compensating optical fiber transmission nonlinear damages

A digital signal processing, nonlinear damage technology, applied in the direction of optical fiber transmission, transmission system, bidirectional transmission, etc., can solve the problems of insignificant effect and complex algorithm, and achieve the effect of accurate determination

Active Publication Date: 2016-06-15
WUHAN POST & TELECOMM RES INST CO LTD
View PDF3 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the existing A-DBP based on signal strength variance, the signal strength variance is directly calculated
Although this method can calculate the fiber nonlinear coefficient of QPSK (quadraturephase shift keying, quadrature ph

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Adaptive digital signal processing algorithm for compensating optical fiber transmission nonlinear damages
  • Adaptive digital signal processing algorithm for compensating optical fiber transmission nonlinear damages
  • Adaptive digital signal processing algorithm for compensating optical fiber transmission nonlinear damages

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0032] Such as figure 1 As shown, the self-adaptive digital signal processing algorithm for compensating optical fiber transmission nonlinear damage of the present invention specifically includes the following steps:

[0033] S1. After the optical signal is received, it is converted into a complex signal in the electrical domain, and after analog-to-digital conversion by an ADC (Analog-to-Digital Converter, analog / digital converter), a digital signal is obtained. Set three nonlinear coefficients γ 1 , γ 2 and gamma 3 , and γ 1 2 3 , the three nonlinear coefficients γ 1 , γ 2 and gamma 3 Substitute into A-DBP algorithm calculation to compensate for dispersion and nonlinear damage. Since the nonlinear coefficient is not known in advance, three signal amplitude values ​​are obtained as initial values. If the transmitter uses polarization ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an adaptive digital signal processing algorithm for compensating optical fiber transmission nonlinear damages, and relates to the field of optical fiber transmission. The algorithm comprises following steps of setting three nonlinear coefficients after a receiving end receives signals; respectively substituting into an adaptive digital backward propagation algorithm for processing, thus obtaining three signal amplitude values as initial values; estimating the nonlinear coefficients by utilizing the strength variances of the signals, wherein after many times of iteration, an optimum nonlinear coefficient gamma <opt > for nonlinear compensation can be estimated; taking the optimum nonlinear coefficient gamma <opt > as the input of adaptive digital backward propagation; then stopping iteration; carrying out CR (carrier recovery) and decode processing to the signals, thus recovering the signals of a transmitting end; and calculating a BER (bit error ratio). The algorithm provided by the invention can be applied in coherent light communication system of an M-QAM (M-ary quadrature amplitude modulation) high order modulation format; the optimum nonlinear coefficient can be determined more precisely; and the algorithm complexity is reduced.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to an adaptive digital signal processing algorithm for compensating nonlinear damage of optical fiber transmission. 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 a good way to use powerful DSP (digital signal processing, digital signal processing) at the receiving end to compensate the 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 optical fibers. However, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04B10/25H04B10/2513H04B10/2543H04B10/54H04B10/61
CPCH04B10/2513H04B10/2543H04B10/2589H04B10/541H04B10/612H04B10/6161H04B10/6163
Inventor 李蔚姚海涛余少华
Owner WUHAN POST & TELECOMM RES INST CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap