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Selective waveband light network structure for supporting communication in light network unit group

An optical network unit and passive optical network technology, applied in the field of optical network structure, can solve problems such as increasing system cost, and achieve the effect of improving network throughput

Inactive Publication Date: 2008-08-20
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that each ONU needs two transmitters and two receivers, which greatly increases the cost of the system

Method used

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  • Selective waveband light network structure for supporting communication in light network unit group
  • Selective waveband light network structure for supporting communication in light network unit group
  • Selective waveband light network structure for supporting communication in light network unit group

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Experimental program
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Embodiment Construction

[0021] Such as figure 1 As shown, in the passive optical network system, there are two virtual private network VPNs, each VPN has two optical network units ONU inside, and one optical network unit ONU does not belong to any VPN (take the passive optical network system as an example , but the number of VPNs in the passive optical network and the number of nodes in each VPN are not limited to this structure). As shown in the figure, each optical network unit ONU and optical line terminal OLT are interconnected in a tree structure. Optical network unit ONU1 and optical network unit ONU2 belong to the first virtual private network VPN, and their fixed receiving wavelengths are located in the same waveband. The optical network unit ONU3 and the optical network unit ONU4 both belong to the second virtual private network VPN, and their fixed receiving wavelengths are in the same waveband, and the fixed receiving wavelength of the optical network unit ONU5 is not in the above two wave...

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Abstract

The invention consists of an optical line terminal, several optical network units, optical tapping element and optical fiber. The optical line terminal, optical network units, optical tapping elements and optical fiber are joined by using tree structure. Each optical network unit and optical line terminal are connected with optical tapping element through optical fiber. The optical line terminal consists of a wavelength- tunable transmitter, a wideband receiver, a dynamical band reflector. The wavelength-tunable transmitter and wideband receiver is connected with reflector through circulator and dynamical band reflector, and the other end of dynamical band reflector is connected with optical fiber. A standing wave transmitter and a receiver are assigned to each optical network unit.

Description

technical field [0001] The present invention relates to an optical network structure in the technical field of optical fiber communication, more specifically a band-selective passive optical network system supporting direct communication within an optical network unit group. Background technique [0002] Passive optical network (PON) is the most promising development scheme in optical access network. PON consists of an Optical Line Terminal (OLT) and N Optical Network Units (ONUs). It is an optical user network with a tree-shaped distributed topology. A network terminal communicates with a large number of user terminals through an optical fiber. In the PON, the OLT broadcasts data packets to the ONUs through the downlink channel, and each ONU sends data packets to the OLT through the uplink channel in the form of time division multiplexing. For a traditional PON, if communication between ONUs is required, the originating ONU first sends the data packet to the OLT. The OLT ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04L12/44
Inventor 苏翼凯胡卫生张晶晶
Owner SHANGHAI JIAOTONG UNIV