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Optical fiber length measuring, communication apparatus and communication system

A technology of optical fiber length and measurement method, which is applied in the field of measurement, can solve the problems of large inherent error of optical fiber length, unfavorable operation and maintenance of PON system, etc., and achieve the effect of improving accuracy

Active Publication Date: 2009-05-27
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] It can be seen from the above that using the technical solution of the prior art, the inherent error of the optical fiber length between the OLT and the ONU or ONT obtained is relatively large, which is not conducive to the further operation and maintenance of the PON system

Method used

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  • Optical fiber length measuring, communication apparatus and communication system
  • Optical fiber length measuring, communication apparatus and communication system
  • Optical fiber length measuring, communication apparatus and communication system

Examples

Experimental program
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Effect test

Embodiment 1

[0070] In this embodiment, after the system installation is completed, the actual response time of each ONU or ONT connected to it can be manually recorded on the OLT side in advance, so that the OLT can query and obtain each NU at the local end according to the identification of each ONU or ONT Or the actual response time of the ONT.

[0071] After the above preset, the same measurement method as the prior art can be used to measure the duration from when the OLT sends the ranging request message to when it receives the ranging response message returned by the ONU or ONT. Before the calculation of the optical fiber length between the OLT, the OLT queries the local records to obtain the actual response time of the corresponding ONU or ONT, and then substitutes the actual response time of the ONU or ONT into the calculation to obtain the optical fiber length between the OLT and the ONU or ONT.

[0072] Because in this embodiment, the method of using the actual response time of ...

Embodiment 2

[0074] Since the actual response times of ONUs or ONTs of the same brand and model are the same, in this embodiment, the actual response times of ONUs or ONTs of various brands and models of various brands can be pre-recorded manually on the OLT side after the system installation is completed. After each ONU or ONT is registered, at the OLT side, the OLT can query the actual response time of each ONU or ONT according to the brand and model identification of each ONU or ONT.

[0075] After the above preset, the same measurement method as the prior art can be used to measure the duration from when the OLT sends the ranging request message to when it receives the ranging response message returned by the ONU or ONT. Before the calculation of the optical fiber length between the OLT, the OLT queries the local records to obtain the actual response time of the corresponding ONU or ONT, and then substitutes the actual response time of the ONU or ONT into the calculation to obtain the o...

Embodiment 3

[0079] image 3 It is a schematic flow chart of the optical fiber length measurement method of this embodiment, as shown in the figure, the method may include:

[0080] Step 301: The ONU or ONT reports the actual response time of the ONU or ONT to the OLT, and the OLT records the actual response time of the ONU or ONT.

[0081] After successful registration, the ONU or ONT can report the actual response time of the ONU or ONT to the OLT actively or according to the request of the OLT. After receiving the reported message, the OLT records the actual response time of the ONU or ONT on the OLT.

[0082] The ONU or ONT can query the local records, obtain the actual response time of the ONU or ONT, and then report the response time to the OLT.

[0083] In the specific implementation process of the embodiment of the present invention, if the ONU or ONT does not record the actual response time of the ONU or ONT locally, the ONU or ONT can obtain the ONU or ONT in real time from its...

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Abstract

The embodiment of the present invention discloses an optical fiber length measuring method, a communication equipment and a communication system. The method includes that: an optical line terminal carries message interaction with an optical network unit or an optical network terminal and determines time scale of the message interaction; and the optical line terminal determines length of optical fiber between the optical line terminal and the optical network unit or the optical network terminal on the basis of the time scales, real response time of the optical network unit or the optical network terminal, pre-equalization time delay of the optical network unit or the optical network terminal designated by the optical line terminal, and time slot of initial transmission. Length of the optical fiber between OLT and ONU or ONT can be measured accurately by applying technical solution of the embodiment of the present invention.

Description

technical field [0001] The invention relates to the field of measurement, in particular to a method for measuring the length of an optical fiber, communication equipment and a communication system. Background technique [0002] At present, in addition to the full development of Digital Subscriber Line (DSL) in the field of access network, optical access is also booming, especially the point-to-multipoint optical access technology——Passive Optical Network , referred to as PON) has once again attracted attention. PON consists of an Optical Line Terminal (OLT), an Optical Network Unit (ONU) or an Optical Network Terminal (ONT), and an optical distribution network. (Distribution Network, ODN for short). The so-called "passive" means that the ODN does not contain any active electronic devices and electronic power sources, and it is all composed of passive devices such as optical splitters (Splitter). [0003] Currently representative PON technologies are Gigabit Passive Optical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/02H04B10/08H04B10/07
Inventor 隋猛杨素林高海王峰
Owner HUAWEI TECH CO LTD
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