TWDM-PON ystem with multi-point fault protection capability

A technology of TWDM-PON and protection capability, applied in the field of optical communication, which can solve the problems such as affecting the whole body

Active Publication Date: 2019-05-28
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, many ONUs that can work normally will be affected, that is, the situation of "one hair will affect the whole body", which is difficult for services that require relatively high communication quality, such as high-quality video conferencing accepted

Method used

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  • TWDM-PON ystem with multi-point fault protection capability
  • TWDM-PON ystem with multi-point fault protection capability
  • TWDM-PON ystem with multi-point fault protection capability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, a TWDM-PON system with multi-point fault protection capability, refer to the attached figure 1 , the optical line terminal OLT1 is connected to N remote nodes RN3 through the feeder fiber 2) to form a star structure, so that the transmission links of each remote node RN do not interfere with each other, and a single fault will not affect other normal operations RN effectively realizes fault isolation, and remote nodes RN3) are connected to each other through feeder optical fibers 4) to form a dual-fiber ring structure, and each remote node RN3) is connected to M optical network units ONU6) through distribution optical fibers 5) Compared with the ring structure, there is no need to pass through other nodes, which reduces the transmission delay and link loss. The optical network unit ONU6 is connected in series from two directions through the distribution fiber 7, the distribution fiber 8 and the optical coupler 9 to form a dual The bus-type structure realiz...

Embodiment 2

[0033] Embodiment two, on the basis of embodiment one, refer to the attached figure 1 , with figure 2 , with image 3 , with Figure 4 , with Figure 5 As shown, in the normal working mode, the specific method to realize the transmission of uplink and downlink services in the network is: in the shown TWDM-PON system, the signal is transmitted from the optical line terminal OLT1 to each remote node in the form of wavelength division multiplexing The point RN3 is transmitted from the remote node RN3 to each optical network unit ONU6 in the form of time division multiplexing. At the optical line terminal OLT1, N optical transmitters 10 generate N channels of optical signals λ carrying their respective downlink information 1 lambda 2 ...λ N-1 lambda N Afterwards, the N optical signals pass through a 1*N arrayed waveguide grating AWG12 wavelength multiplexing and then pass through the optical circulator 14, and then pass through a bidirectional erbium-doped fiber amplifier E...

Embodiment 3

[0034] Embodiment 3, on the basis of Embodiment 1, the method for realizing the protection function is as follows: S1, refer to the attached Image 6 , when the feeder fiber 2 fails, and at least one remote node RN on both sides of the faulty fiber can work normally, N: 1 comprehensive protection can be performed through the ring network formed by the feeder fiber 4, assuming that it is connected to the RN i The feeder fiber failure, the remote node RN i The 3*1 optical switch 17 inside performs protection switching, port 1 is connected to port 2, and the remote node RN i-1 OS in 1*1 optical switch 23 inside i Perform protection switching, the switch is closed, and the N-channel downlink signal λ generated by OLT1 1 lambda 2 ...λ N-1 lambda N Reach each remote node RN through feeder fiber 2, RN i Due to the failure of the feeder fiber connecting it, the downlink signal belonging to it cannot be received, but contains RN i Downlink wavelength λ i The multiplexed signal ...

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Abstract

The invention provides a TWDM-PON system with multi-point fault protection capability, fault isolation is effectively realized; the condition that the whole body is started is avoided; More importantly, more importantly, the structure is simple, The method comprises the following steps: designing an internal structure of a ring network and a remote node RN so that the network can realize fault recovery even under the condition that only one remote node RN can work normally; N: realizing feeder optical fiber Comprehensive protection, the reliability of the network is greatly improved; Besides,directly transmitting the signal to the target optical network unit ONU along the star network. Compared with an annular structure, no other nodes are needed, the transmission delay and the link lossare reduced, the network unit ONU adopts a bus type topological structure, the working optical fiber and the protection optical fiber transmit signals at the same time, the coupler instead of the optical switch is used along the way, the ONU is automatically protected without switching, and meanwhile the network cost is reduced.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a TWDM-PON system with multi-point fault protection capability. Background technique [0002] With the emergence of many emerging applications, such as high-definition television, virtual reality, etc., network traffic has shown explosive growth, and user bandwidth requirements have surged. WDM-PON and TWDM-PON under the integrated environment of convergence and access are considered to be effective solutions for future broadband access. The realization of ultra-large bandwidth brings people to think about another problem. Once the network fails, it will cause massive data loss. In addition, many real-time services such as telemedicine cannot tolerate long-term network failures. Therefore, it is particularly important to improve the fault protection capability of the network. [0003] In the current feeder optical fiber protection scheme, backup protection is usually used,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/035H04B10/27H04J14/02
Inventor 吴晨光赵景隆王文革赵豫京戚晓勇李功明张毓琪邵奇郭亚琴甘朝钦
Owner STATE GRID CORP OF CHINA
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