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Method and system for realizing electrical dispersion compensation

An electrochromic and photoelectric technology, applied in the field of dispersion compensation, can solve problems such as poor ability to compensate dispersion, signal inter-symbol interference, loss of function, etc., to reduce the degree of inter-symbol interference, alleviate the degree of inter-symbol interference, and improve compensation The effect of the ability to disperse

Inactive Publication Date: 2010-05-19
BEIJING UNIV OF POSTS & TELECOMM +1
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Problems solved by technology

Since the linear forward feedback equalizer 13 cannot improve the degree of signal intersymbol interference very well, the CDR unit 14 often makes wrong decisions, resulting in a high bit error rate of the output signal
[0011] It can be seen that due to the nonlinear characteristics of the square detection of the fiber channel, the ability of the linear feed-forward equalizer to compensate for the dispersion is not very good
The equalized signal still has a large intersymbol interference, especially when the accumulated dispersion value is large (greater than 1700ps / nm) the linear forward feedback equalizer is almost useless

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  • Method and system for realizing electrical dispersion compensation
  • Method and system for realizing electrical dispersion compensation
  • Method and system for realizing electrical dispersion compensation

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Embodiment Construction

[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0046] The core content of the present invention is: an inverse power transfer function filter based on a certain algorithm is configured before the linear feed-forward equalizer, and the inverse power transfer function filter reduces the nonlinear code space existing in the received electrical signal by filtering interference, leaving an electrical signal dominated by linear intersymbol interference; then, the inverse power transfer function filter outputs the electrical signal to the linear feed-forward equalizer, so that the linear feed-forward equalizer can fully exert its linear equalization The ability greatly alleviates the degree of intersymbol interference of the signal, and improves the ability of the linear forw...

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Abstract

The invention relates to dispersion compensation technology field in a fiber transmission system, discloses a method which realizes electric dispersion compensation. The method comprises as follow: A.a reverse power transfer function filter is arranged before the linear forward feedback equalizer; B. after the electrical signal is received by the reverse power transfer function filter, the nonlinear intersymbol interference which exists in the electrical signal is reduced via filtering, thus the electrical signal which is mainly consisted of linear inter-symbol interference is remained and the electrical signal is outputted to the linear forward feedback equalizer; C. the forward feedback equalizer balances the inputted electrical signal and outputs the balanced electrical signal to the clock and data recovering (CDR) unit. The invention also discloses a system to realize the electric dispersion compensation. By adopting the invention, the nonlinear inter-symbol interference degree isreduced and the dispersion compensation ability of the linear forward feedback equalizer is greatly improved.

Description

technical field [0001] The invention relates to the technical field of dispersion compensation in optical fiber transmission systems, in particular to a method and system for realizing electrical dispersion compensation. Background technique [0002] The optical signal in the high-speed optical fiber transmission system will be affected by dispersion during the transmission process, resulting in bit errors in the received signal and degrading the performance of the system. When the single channel rate is 10Gbit / s, the typical value of the dispersion tolerance of the optical signal is about 1000ps / nm. For the G..652 optical fiber without dispersion compensation, the dispersion limited distance is less than 60 kilometers. In order to extend the signal without electrical relay It is very necessary to compensate the dispersion of the signal due to the transmission distance. [0003] Dispersion compensation of single-mode fiber can generally be divided into optical domain compen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/18H04B10/17H04B10/2513
Inventor 李良川张阳安古渊
Owner BEIJING UNIV OF POSTS & TELECOMM
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