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Method for prolonging transmission distance of passive optical network system, and optical line terminal

A passive optical network and transmission distance technology, applied in optical fiber transmission, multiplexing system selection device, transmission system and other directions, can solve the problems of different transmission distance, excessive dispersion, different dispersion, etc. effect of distance

Inactive Publication Date: 2014-08-27
ZTE CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, EDC compensates the upstream signals of different ONUs with a fixed amount of dispersion (for example, according to the amount of dispersion of the farthest ONU), but because one OLT of the PON system corresponds to multiple ONUs, the transmission distance between different ONUs and the OLT Different, so the amount of dispersion suffered by the upstream signal of each ONU is different
Insufficient dispersion compensation for uplink signals or excessive dispersion compensation for uplink signals cannot effectively extend the transmission distance of the system

Method used

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  • Method for prolonging transmission distance of passive optical network system, and optical line terminal
  • Method for prolonging transmission distance of passive optical network system, and optical line terminal
  • Method for prolonging transmission distance of passive optical network system, and optical line terminal

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Embodiment Construction

[0035] A method for extending the transmission distance of the PON system provided by the present invention, such as figure 1 As shown, the method includes:

[0036] Step 101, obtaining the EDC tap coefficients for each ONU;

[0037] Step 102 , according to the EDC tap coefficients corresponding to each ONU, respectively perform dispersion compensation on the uplink signal sent by each ONU.

[0038] Preferably, after the acquisition of the EDC tap coefficients for each ONU, the method may also include:

[0039] The acquired EDC tap coefficients of each ONU are updated.

[0040] Preferably, updating the obtained EDC tap coefficients of each ONU may be:

[0041] During the normal working phase of the ONU, the acquired EDC tap coefficients of each ONU are updated according to channel changes or preset time intervals.

[0042] Preferably, updating the obtained EDC tap coefficients of each ONU may be:

[0043] The obtained EDC tap coefficients of each ONU are updated by using ...

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Abstract

The invention discloses a method for prolonging the transmission distance of a passive optical network system, and an optical line terminal. The method includes the following steps: obtaining a tap coefficient of an electronic dispersion compensator (EDC) for each optical network unit (ONU); and according to the tap coefficient of the EDC corresponding to each ONU, carrying out dispersion compensation on an uplink signal sent by each ONU. The method for prolonging the transmission distance of the passive optical network system, and the optical line terminal are capable of carrying out targeted compensation on dispersion, to which ONUs of different transmission distances are subjected, so that the transmission distance of the system can be prolonged effectively.

Description

technical field [0001] The present invention relates to a passive optical network (Passive Optical Network, PON) system transmission technology, in particular to a method for extending the transmission distance of a PON system and an optical line terminal (Optical Line Terminal, OLT). Background technique [0002] For high-speed PON systems (the system rate is higher than 10Gbit / s), optical signals will be affected by dispersion during long-distance transmission, resulting in a reduction in transmission distance, resulting in bit errors in received signals and degrading system performance. Perform dispersion compensation to extend the transmission distance of the system, thereby improving system performance. For a wavelength division multiplexing (WDM) PON system based on a low-cost colorless optical network unit (Optical Network Unit, ONU), due to the low modulation rate of the ONU (generally lower than several Gb / s), WDM PON The system cannot meet the requirements of larg...

Claims

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Application Information

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IPC IPC(8): H04B10/2513H04Q11/00
CPCH04B10/697H04B10/25133H04Q11/0067H04Q2011/0079
Inventor 陈雪陈扬洋苏婕李长垒何子安黄新刚周娴
Owner ZTE CORP