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Access control method in wavelength division multiplexing passive optical network and device thereof

A passive optical network and wavelength division multiplexing technology, which is applied in the field of passive optical network, can solve the problems of cost-intensive users or operators, and achieve the effect of protecting the initial investment, reducing construction or use costs, and improving downlink bandwidth

Active Publication Date: 2013-04-24
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Because of the ever-increasing user demand for downlink bandwidth, the access network needs to provide higher bandwidth. However, simply increasing the bandwidth of the uplink and downlink channels at the same time (for example, increasing to 10Gbps) can guarantee the user's bandwidth demand, but the cost is difficult to be met. accepted by the user or operator

Method used

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  • Access control method in wavelength division multiplexing passive optical network and device thereof
  • Access control method in wavelength division multiplexing passive optical network and device thereof
  • Access control method in wavelength division multiplexing passive optical network and device thereof

Examples

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Embodiment 1

[0034] The steps in this example are performed under the precondition that the OLT and the ONU have been synchronized. The OLT and the ONU can be synchronized in various ways, for example, the OLT periodically sends a synchronization signal to the ONU to achieve synchronization, which will be described in detail below.

[0035] In step S101, the OLT 10 sends a registration notification message to one or more optical user-side devices via one or more downlink optical wavelengths, so as to notify the optical user-side devices to register. Based on the prior art, the OLT 10 periodically sends a registration notification message to notify any new ONU to register. In the existing technology based on downlink single-wavelength transmission, the registration notification message is broadcast by the OLT, and it is also used to notify all ONUs of the registration window opening time to suspend the upload service, so as to avoid the feedback messages of some ONUs from interacting with s...

Embodiment 2

[0060] When the registration process starts, the third notification device 1005 in the activation device 100 in the OLT10 sends a registration notification message to one or more optical user side devices via one or more downlink optical wavelengths to notify the optical user side device to register. Based on the prior art, the OLT 10 periodically sends a registration notification message to notify any new ONU to register. In the existing technology based on downlink single-wavelength transmission, the registration notification message is broadcast by the OLT, and it is also used to notify all ONUs of the registration window opening time to suspend the upload service, so as to avoid the feedback messages of some ONUs from interacting with some other The upload service of the ONU collides on the uplink path. In the existing technology based on downlink single-wavelength transmission, the registration notification message is sent by OLT broadcast, and it is also used to notify ...

Embodiment 3

[0103] refer to Figure 1 to Figure 5 , in this embodiment, the OLT 10 uses a single wavelength λu for uplink, which corresponds to 1310nm; four wavelengths λd1 to λd4 for downlink, corresponding to 1490nm, 1510nm, 1530nm and 1550nm respectively; when the downlink signal on each downlink wavelength uses a 2.48Gbps The symbol rate, the overall downlink bandwidth of the system is close to 10G. Those skilled in the art should understand that the above parameters are exemplary rather than limiting. Compared with the existing GPON technology, the main improvements of this embodiment are:

[0104] On the OLT side, the synchronization control device 1000 in the activation device 100 controls the signal processing devices corresponding to each downstream wavelength to use the same local clock to maintain the synchronization of the downstream signal frames on the four wavelengths. The value of the "Super Frame Counter" in the downlink frame sent at all times is consistent. At the be...

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Abstract

The invention provides a technical scheme of a novel wavelength division multiplexing passive optical network, which comprehensively considers ever-increasing user downlink bandwidth demands and uplink and downlink asymmetry of high-speed Internet service, adopts multi-wavelength at the downlink for loading downlink signals and keeps the single wavelength at the uplink for loading uplink signals.The technical scheme of the invention can improve the total downlink bandwidth of a PON system, can adopt the prior art in quantity to the access control technique and the frame format design so as tobe compatible with terminal equipment in the passive optical network, thereby being an economic high-speed solving scheme of the passive optical network, effectively protecting the prior period investment of an operator or user and lowering the building or using cost when being especially applied to upgrade the prior passive optical network.

Description

technical field [0001] The invention relates to passive optical network technology, in particular to an access control method and device in a wavelength division multiplexing (WDM) passive optical network with multiple downlink wavelengths. Background technique [0002] PON (Passive Optical Network) technology is a point-to-multipoint optical fiber access technology, which consists of OLT (Optical Line Terminal) on the office side, ONU (Optical Network Unit) or ONT (Optical Network Terminal) on the user side and ODN (Optical Distribution Network), which can flexibly form tree, star and bus topology (typical structure is tree structure). The so-called "passive" means that the ODN does not contain any active electronic devices and electronic power supplies, and is all composed of passive devices such as optical splitters (Splitter), so its management and maintenance costs are relatively low. [0003] The following two implementations of WDM passive optical networks are known:...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04L12/28H04L12/911
Inventor 齐江陈晓
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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