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System and method for realizing same-wavelength uplink and downlink isolation and grading protection functions of colorless wavelength division multiplexing optical access network

A technology of hierarchical protection and wavelength division multiplexing, applied in the field of optical communication, can solve the problems of high client cost and immature technology, and achieve the effect of saving system cost and powerful protection function

Inactive Publication Date: 2014-07-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] WDM-PON has its advantages over other passive optical networks, but because the technology is not mature enough, the cost of the client is still too high

Method used

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  • System and method for realizing same-wavelength uplink and downlink isolation and grading protection functions of colorless wavelength division multiplexing optical access network
  • System and method for realizing same-wavelength uplink and downlink isolation and grading protection functions of colorless wavelength division multiplexing optical access network
  • System and method for realizing same-wavelength uplink and downlink isolation and grading protection functions of colorless wavelength division multiplexing optical access network

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment one: see figure 1 : A colorless wavelength division multiplexing optical access network realizes the same wavelength uplink and downlink isolation and hierarchical protection system, which consists of optical line terminal OLT (1), remote node RN (10) and optical network unit ONU ( 11) Composition. Through two feeder optical fibers: working optical fiber (8) and protective optical fiber (9), n remote nodes RN (10) are sequentially connected to form a ring network and connected to OLT (1), and there are m under each RN (10) The ONU (11) forms a star ring structure and supports m*n users in total. It is characterized in that: 1), the structure of the OLT (1) is: n*m burst module transmitters (2), n*m burst module receivers (14), 1 wavelength division multiplexer ( 3), 1 wave division multiplexer (15), first and second EDFA-doped fiber amplifiers (4, 16), 1 first 3dB coupler (5), first and second 2 1* It consists of 2 optical switches (6, 18), the first and ...

Embodiment 2

[0027] Embodiment two: see figure 1 , figure 2 , image 3 , using the above system for propagation, this colorless wavelength division multiplexing optical access network realizes the method of isolation and hierarchical protection functions of uplink and downlink of the same wavelength, which is characterized by: in normal mode, in the OLT (1), by n* m optical transmitters (2) transmit optical signals into the wavelength division multiplexer (3) and then to the 3dB coupler (5) after multiplexing, because the second 1*2 optical switch (18) hits port 2, so Half of the output optical signals are used as reserved signals. The other half of the optical signal enters RN1 (10) after passing through the first 1*2 optical switch (6). For the convenience of description, RNj(10) is selected here as the description object. wavelength is - The optical signal enters the RNj (10), the optical signal passes through the third 1*2 optical switch (21) and the 2*2 optical switch (26) in...

Embodiment 3

[0028] Embodiment three: see figure 1 , figure 2 , image 3 . The method for realizing hierarchical protection capability by adopting the colorless wavelength division multiplexing passive optical network system proposed above is characterized by:

[0029] 1) When a single fiber failure occurs on the working feeder (8) and protection fiber (9) between the OLT (1) and RN1 (10), switch the first 1*2 optical switch (6) to port 2 at the same time Connect the third 1*2 optical switch (21) in RN1 (10) to port No. 2, and the fourth 1*2 optical switch (20) to port No. 1, so that the optical signal can be transmitted through the protective fiber (9) .

[0030] 2) When a single-fiber fault occurs in the feeder between RNs (10), it is only necessary to switch the fifth 1*2 optical switch (24) of the previous RN to port 2, and the sixth 1*2 optical switch (25 ) to port 1, the third 1*2 optical switch (21) of the next RN to port 2, and the fourth 1*2 optical switch (20) to port 1, s...

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Abstract

The invention relates to a system and a method for realizing same-wavelength uplink and downlink isolation and grading protection functions of a colorless wavelength division multiplexing optical access network. The system is composed of an optical line terminal (OLT), far-end nodes (RN), and optical network units (ONU). According to the system, two fibers are utilized to connect all RNs to form an annular topological structure; and the two fibers are interdependent so as to form protection of feed lines and fibers among the RNs. Meanwhile, a plurality of ONUs are hung under each of the RNs, so that a star annular structure is formed between the RN and the ONUs. Therefore, mutual protection among the ONUs can be formed and thus distributed fibers can be protected. In order to solve problems of a feed line fault, a single fiber fault, a double fiber fault and a distributed fiber fault, wherein the problems might happen, the OLT, the RNs and optical switches in the ONUs can be utilized to carry out adjustment, so that a while network structure can be reestablished and normal communication of uplink and downlink signals can be protected. Beside, in order to reduce cost of a user terminal, RSOAs are arranged in the ONUs, so that a downlink signal can be eliminated and an uplink signal can be remodulated. Moreover, the network quality is improved.

Description

technical field [0001] The invention is applicable to the field of optical communication, in particular to a system and method for realizing the uplink and downlink isolation and hierarchical protection functions of the same wavelength in the colorless wavelength division multiplexing optical access network, which greatly improves the communication quality. Background technique [0002] With the continuous emergence of Internet applications, time-division multiplexing passive optical network (TDM-PON) can no longer meet users' demand for bandwidth. Wavelength division multiplexing passive optical network (WDM-PON) has attracted people's attention due to its high bandwidth, high capacity, transparent transmission characteristics, and high security, and has been identified as the next-generation optical access method. As the speed of the access network is getting faster and faster, when the network fails, the entire communication quality will be greatly affected. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/07H04Q11/00H04B10/032
Inventor 吴晨炜甘朝钦龚龑王瑞雪戚永前
Owner SHANGHAI UNIV
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