CN103281152A - Convergence type metropolitan area wavelength division access network system and accessing method - Google Patents
Convergence type metropolitan area wavelength division access network system and accessing method Download PDFInfo
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Abstract
The invention discloses a convergence type metropolitan area wavelength division access network system and an accessing method, and relates to the field of metropolitan area access. The system comprises an OLT located in a central apparatus room, m ROADM nodes and n far-end OTUs, wherein m and n belong to positive integers, m is larger than or equal to 1, and n is larger than or equal to m. The central apparatus room is a network convergence point, the OLT of the central apparatus room and the m ROADM nodes are sequentially connected through optical fibers to form an annular topological structure, the connecting direction of the m ROADM nodes in an annular topology is expressed in the eastward direction and the westward direction, on the basis of the clockwise direction, the eastward direction of a prior ROADM node is connected with the westward direction of a next ROADM node, only one optical fiber exists between every two adjacent ROADM nodes, and each ROADM node is connected with at least one far-end OTU. All services of a service provider can be accessed through one network, the robustness requirements such as mobile backhaul and a special line for a big customer are met, management is convenient, cost is low, bandwidth is allocated flexibly, capacity is large, and the accessing distance is long.
Description
Technical field
The present invention relates to the metropolitan area and insert the field, particularly relate to a kind of convergent type metropolitan area wavelength-division access network system and cut-in method.
Background technology
Along with technology and professional sustainable developments such as internet, Internet of Things, cloud computing, the integration of three networks, the demand of user's access bandwidth increases substantially.When China proposed by 2015, user's access bandwidth in flourishing city reached the 100Mb/s(MBPS).Under prerequisite cheaply, big capacity, big bandwidth becomes PON(Passive Optical Network, EPON) developing goal of technology, EPON(Ethernet Passive Optical Network, Ethernet passive optical network), GPON(Gigabit-Capable PON, G bit Ethernet passive optical network) commercial on a large scale in the whole world, 10G EPON/GPON progressively comes into the market, standardization body is then formulating TWDM-PON(Time Wavelength Division Multiplexing-Passive Optical Network, time-division wavelength division multiplexing-EPON) etc. more jumbo light access technology of future generation.
Mobile communication is progressively entering the 4G epoch, and the bandwidth demand of base station is brought up to the Gb/s(G bits per second by 100,000,000 of the 2G/3G epoch) magnitude.The mobile retransmission network not only continues to require high robust and OAM(Operation Administration and Maintenance, operation, management, maintenance) ability, and need high bandwidth.In addition, big customer's special line, WiFi(Wireless Fidelity, the authentication of wireless compatibility) bandwidth requirement of focus etc. is also improving.The demand of high bandwidth makes WDM(Wavelength Division Multiplexing, wavelength division multiplexing) technology becomes the choice direction that the metropolitan area inserts.
For a long time, the fixed broadband of operator inserts and converges net, the mobile retransmission net all is separately to build to safeguard, the former pays attention to building the dimension cost, and the latter emphasizes network quality.Operator presses for realization " an optical fiber full-service inserts ", builds peacekeeping planning, management to simplify network, alleviates cost pressure.But, the technology of PON class is difficult to satisfy the high-quality requirement of mobile retransmission, big customer's special line etc., MSTP(Multi-Service Transmission Platform, multi-service transport platform), PTN(Packet Transport Network, Packet Transport Network)/IPRAN(IP Radio Access Network, the IP wireless access network) etc. technical costs is higher, can't satisfy the low-cost requirement that domestic consumer inserts.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology, a kind of convergent type metropolitan area wavelength-division access network system and cut-in method are provided, can realize all professional network insertions of operator, satisfy the robustness requirement of mobile retransmission, big customer's special line etc., be convenient to management and build dimension, cost is lower, and allocated bandwidth is flexible, capacity is big, inserts distance.
Convergent type provided by the invention metropolitan area wavelength-division access network system, comprise the optical line terminal OLT that is positioned at central machine room, m Reconfigurable Optical Add/drop Multiplexer ROADM node and n far-end optical transport unit OTU, m, n is positive integer, m 〉=1, n 〉=m, the wavelength of n far-end OTU correspondence is respectively λ 1, λ n, it is characterized in that: be the networks converge point with the central machine room, central machine room OLT is connected by optical fiber in turn with m ROADM node, constitute ring topology, m ROADM node in the ring topology is by being numbered ROADM1 clockwise, ROADM2, ROADM m-1, ROADM m, with east orientation, the closure of m ROADM node in ring topology is always represented in the west, according to clockwise direction, the east orientation of last ROADM node with the back one ROADM node the west to linking to each other, has only an optical fiber between adjacent two ROADM nodes, each ROADM node connects at least one far-end OTU, each far-end OTU is linked into the business of its region in the ring topology by the ROADM node that links to each other with this far-end OTU, and each ROADM node carries out the straight-through of respective wavelength passage, on/following route; With under the state, central machine room OLT sends to signal transmission clockwise in ring topology of ROADM node main, namely from west that the east orientation of last ROADM node sends to back one ROADM node to; The signal that the ROADM node sends to central machine room OLT is transmission counterclockwise in ring topology, namely from the west of last ROADM node to the east orientation that sends to back one ROADM node; Under stand-by state, central machine room OLT sends to signal transmission counterclockwise in ring topology of ROADM node, and the ROADM node sends to signal transmission clockwise in ring topology of central machine room OLT.
On the basis of technique scheme, when the optical fiber between ROADM i and the ROADMi+1 in the ring topology breaks down disconnection, i is positive integer, central machine room OLT and ROADM1 ..., the signal between the ROADM i transmits with state by main, central machine room OLT and ROADM i+1 ..., the signal between the ROADM m transmits by stand-by state.
On the basis of technique scheme, described central machine room OLT comprises that k upper united mouth, the convergence module that links to each other with k upper united mouth, n local side OTU, n local side optical switch OS, n the local side optical circulator OC that links to each other with convergence module, an east orientation wavelength division multiplexer and a west are to wavelength division multiplexer, k is positive integer, the wavelength of n local side OTU correspondence be respectively λ 1 ..., λ n, n local side OTU is corresponding one by one with the wavelength of n far-end OTU, and the local side OTU that corresponding wavelength is identical and far-end OTU coupling become a pair of; N local side optical circulator OC
1..., OC
nInclude first ring port, second ring port and the 3rd ring port, n local side optical switch OS
1..., OS
nBe 1 * 2 optical switch, each local side optical switch comprises first port, second port and the 3rd port, k upper united mouth links to each other with the metro core net, convergence module is finished converging of miscellaneous service, each local side OTU links to each other with a local side optical switch by a local side optical circulator, and each local side optical switch links to each other to wavelength division multiplexer with east orientation wavelength division multiplexer, west respectively; The local side optical circulator is finished single fiber bi-directional and two fine unidirectional conversion: the light that local side OTU sends enters optical circulator through first ring port of local side optical circulator, come out from second ring port of local side optical circulator, pass through the local side optical switch again, enter the east orientation wavelength division multiplexer or the west close ripple to wavelength division multiplexer, leading with under the state, the signal that local side OTU sends is sent to the east orientation wavelength division multiplexer through the local side optical switch, under stand-by state, the signal that local side OTU sends is sent to the west to wavelength division multiplexer through the local side optical switch; The light that comes out to the wavelength division multiplexer partial wave in east orientation wavelength division multiplexer or west through the local side optical switch, enters the local side optical circulator from second ring port of local side optical circulator, comes out from the 3rd ring port of local side optical circulator, sends to local side OTU.
On the basis of technique scheme, when the optical fiber between ROADM i and the ROADMi+1 in the ring topology breaks down disconnection, i is positive integer, with be connected ROADM1 ..., ROADM i the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU work with under the state main, be connected ROADM i+1 ..., ROADM m the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU under stand-by state, work.
On the basis of technique scheme, the local side OTU of corresponding wavelength λ 1 be connected ROADM1 ..., ROADM i far-end OTU in the wavelength of some far-end OTU correspondences when identical, local side optical switch OS
1First port be communicated with second port, the local side OTU of corresponding wavelength λ 1 is communicated with the east orientation wavelength division multiplexer; The local side OTU of corresponding wavelength λ n be connected ROADM i+1 ..., ROADM m far-end OTU in the wavelength of some far-end OTU correspondences when identical, first port of local side optical switch OSn is communicated with the 3rd port, and the local side OTU of corresponding wavelength λ n is communicated with to wavelength division multiplexer with the west.
On the basis of technique scheme, each the ROADM node in the described ring topology comprises a wavelength-selective switches WSS and 4 ROADM optical switch: OS
1', OS
2', OS
3', OS
4', 4 ROADM optical switches are 1 * 2 optical switch, include first port, second port and the 3rd port, and the WSS of each ROADM intranodal links to each other with at least one far-end OTU, each far-end OTU links to each other OS by a far-end optical circulator with the WSS of ROADM intranodal
1' first port, OS
2' first port all link to each other OS with WSS
1' second port and OS
3' second port link to each other OS
2' second port and OS
3' the 3rd port link to each other OS
1' the 3rd port and OS
4' the 3rd port link to each other OS
2' the 3rd port and OS
4' second port link to each other; The WSS of ROADM intranodal finish local wavelength on/following loop, and other wavelength is straight-through; Leading with under the state OS
3' first port, second port be communicated with OS
1' first port, second port be communicated with OS
2' first port, the 3rd port be communicated with OS
4' first port, second port be communicated with, signal advances/goes out OS from the west
3', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
4' go out from east/advance; Under stand-by state, OS
4' first port, the 3rd port be communicated with OS
1' first port, the 3rd port be communicated with OS
2' first port, second port be communicated with OS
3' first port, the 3rd port be communicated with, signal advances/goes out OS from east
4', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
3' from exporting to the west/advancing.
On the basis of technique scheme, when the optical fiber between ROADM i and the ROADMi+1 in the ring topology breaks down disconnection, i is positive integer, ROADM1 ..., all the ROADM optical switches among the ROADMi all be operated in main with under the state, ROADM i+1 ..., all the ROADM optical switches among the ROADM m all are operated under the stand-by state.
On the basis of technique scheme, the placement that exists together of the connected ROADM node of described far-end OTU, perhaps connected ROADM places at different place as required, and the line interface of far-end OTU comprises circuit transmission interface L
TXWith circuit receiving interface L
RX, WSS is by the circuit transmission interface L of distal annular rim device and far-end OTU
TXWith circuit receiving interface L
RXLink to each other, far-end OTU comprises client's side transmission interface C
TXReceive interface C with client's side joint
RX, perhaps adopt branch road multiple connection TMUX technology that many group client side interfaces are provided, namely far-end OTU comprises a plurality of client's side transmission interface C
TXReceive interface C with a plurality of client's side joints
RXIf business is unidirectional, receive only or send, then far-end OTU includes only client's side transmission interface C
TXOr include only client's side joint and receive interface C
RX, far-end OTU incoming fiber optic inserts FTTx user, digital subscriber line access multiplex DSLAM, big customer's special line or mobile base station.
On the basis of technique scheme, when a pair of local side OTU, the far-end OTU that is operated in same wavelength is used for the PON access, physical layer function among the PON realizes that in client's side interface of far-end OTU the MAC layer MAC/ Transmission Convergence TC function among the PON realizes in local side OTU.
The present invention also provides a kind of convergent type metropolitan area wavelength-division cut-in method based on above-mentioned access network system, may further comprise the steps:
With under the state, central machine room OLT sends to signal transmission clockwise in ring topology of ROADM node main, namely from west that the east orientation of last ROADM node sends to back one ROADM node to; The signal that the ROADM node sends to central machine room OLT is transmission counterclockwise in ring topology, namely from the west of last ROADM node to the east orientation that sends to back one ROADM node; Under stand-by state, central machine room OLT sends to signal transmission counterclockwise in ring topology of ROADM node, and the ROADM node sends to signal transmission clockwise in ring topology of central machine room OLT.
On the basis of technique scheme, when the optical fiber between ROADM i and the ROADMi+1 in the ring topology breaks down disconnection, i is positive integer, central machine room OLT and ROADM1 ..., the signal between the ROADM i transmits with state by main, central machine room OLT and ROADM i+1 ..., the signal between the ROADM m transmits by stand-by state.
On the basis of technique scheme, the light that local side OTU sends enters optical circulator through first ring port of local side optical circulator, come out from second ring port of local side optical circulator, pass through the local side optical switch again, enter the east orientation wavelength division multiplexer or ripple is closed to wavelength division multiplexer in the west, with under the state, the signal that local side OTU sends is sent to the east orientation wavelength division multiplexer through the local side optical switch main, under stand-by state, the signal that local side OTU sends is sent to the west to wavelength division multiplexer through the local side optical switch; The light that comes out to the wavelength division multiplexer partial wave in east orientation wavelength division multiplexer or west through the local side optical switch, enters the local side optical circulator from second ring port of local side optical circulator, comes out from the 3rd ring port of local side optical circulator, sends to local side OTU.
On the basis of technique scheme, when the optical fiber between ROADM i and the ROADMi+1 in the ring topology breaks down disconnection, i is positive integer, with be connected ROADM1 ..., ROADM i the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU work with under the state main, be connected ROADM i+1 ..., ROADM m the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU under stand-by state, work.
On the basis of technique scheme, the local side OTU of corresponding wavelength λ 1 be connected ROADM1 ..., ROADM i far-end OTU in the wavelength of some far-end OTU correspondences when identical, local side optical switch OS
1First port be communicated with second port, the local side OTU of corresponding wavelength λ 1 is communicated with the east orientation wavelength division multiplexer; The local side OTU of corresponding wavelength λ n be connected ROADM i+1 ..., ROADM m far-end OTU in the wavelength of some far-end OTU correspondences when identical, first port of local side optical switch OSn is communicated with the 3rd port, and the local side OTU of corresponding wavelength λ n is communicated with to wavelength division multiplexer with the west.
On the basis of technique scheme, the WSS of ROADM intranodal finish local wavelength on/following loop, and other wavelength is straight-through; Leading with under the state OS
3' first port, second port be communicated with OS
1' first port, second port be communicated with OS
2' first port, the 3rd port be communicated with OS
4' first port, second port be communicated with, signal advances/goes out OS from the west
3', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
4' go out from east/advance; Under stand-by state, OS
4' first port, the 3rd port be communicated with OS
1' first port, the 3rd port be communicated with OS
2' first port, second port be communicated with OS
3' first port, the 3rd port be communicated with, signal advances/goes out OS from east
4', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
3' from exporting to the west/advancing.
On the basis of technique scheme, when the optical fiber between ROADM i and the ROADMi+1 in the ring topology breaks down disconnection, i is positive integer, ROADM1 ..., all the ROADM optical switches among the ROADMi all be operated in main with under the state, ROADM i+1 ..., all the ROADM optical switches among the ROADM m all are operated under the stand-by state.
On the basis of technique scheme, when a pair of local side OTU, the far-end OTU that is operated in same wavelength is used for the PON access, physical layer function among the PON realizes that in client's side interface of far-end OTU the MAC layer MAC/ Transmission Convergence TC function among the PON realizes in local side OTU.
Compared with prior art, advantage of the present invention is as follows:
(1) the present invention finishes service convergence at central machine room OLT place, be convenient to networking and O﹠M, both keep the low-cost requirement that PON inserts, satisfied the robustness requirement of mobile retransmission, big customer's special line etc. again, also met trend such as big bandwidth access, network flattening simultaneously; Have allocated bandwidth characteristic flexible, that easily upgrade, can satisfy multiple metropolitan area access demands such as movement, fixed broadband, be fit to miscellaneous service in network quality and cost.
(2) the present invention adopts ROADM to realize the flexible allocation of wavelength and bandwidth, needs 4 WSS to compare with ROADM in the common wdm system, and ROADM of the present invention only needs a WSS, and cost is lower, and is simple in structure.
(3) the present invention utilize the metropolitan area insert in business be star-like relation, all business are concentrated to the central office, constitute a single fiber ring dexterously, alleviation metropolitan area fiber resource anxiety.
(4) the present invention realizes that all professional 0 layer networks insert, and technical costs is lower, can avoid complicated electric territory such as MSTP, IPRAN/PTN to handle, and energy consumption is little.
(5) the wavelength conversion of the present invention by OTU break various/for the constraint of PON technology for wavelength planning, various to realize/for the coexistence of PON technology with upgrade as required.
(6) the present invention adopts wavelength-division multiplex technique to realize that big bandwidth inserts, and realizes the super large covering radius of this convergent type access network by light amplification and OTU, and capacity is big, inserts distance.
Description of drawings
Fig. 1 is the structured flowchart of embodiment of the invention convergent type metropolitan area wavelength-division access network system.
Fig. 2 is the structured flowchart of central machine room OLT in the embodiment of the invention.
Fig. 3 is the structured flowchart of ROADM node in the embodiment of the invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and the specific embodiments.
Referring to shown in Figure 1, the embodiment of the invention provides a kind of convergent type metropolitan area wavelength-division access network system, comprise and be positioned at CO(Central Office, central machine room) OLT(Optical Line Terminal, optical line terminal), m ROADM(Reconfigurable Optical Add-Drop Multiplexer, Reconfigurable Optical Add/drop Multiplexer) node and n far-end OTU(Optical Transport Unit, optical transport unit), m, n is positive integer, m 〉=1, n 〉=m, the wavelength of n far-end OTU correspondence is respectively λ 1, λ n, be the networks converge point with the central machine room, central machine room OLT is connected by optical fiber in turn with m ROADM node, constitute ring topology, m ROADM node in the ring topology is by being numbered ROADM1 clockwise, ROADM2, ROADM m-1, ROADM m, with east orientation, the closure of m ROADM node in ring topology is always represented in the west, according to clockwise direction, the east orientation of last ROADM node with the back one ROADM node the west to linking to each other, has only an optical fiber between adjacent two ROADM nodes, each ROADM node connects at least one far-end OTU, and each far-end OTU is linked into the business of its region in the ring topology by the ROADM node that links to each other with this far-end OTU.Each ROADM node carry out the respective wavelength passage straight-through, on/following route.
With under the state, central machine room OLT sends to signal transmission clockwise in ring topology of ROADM node main, namely from west that the east orientation of last ROADM node sends to back one ROADM node to; The signal that the ROADM node sends to central machine room OLT is transmission counterclockwise in ring topology, namely from the west of last ROADM node to the east orientation that sends to back one ROADM node; Under stand-by state, central machine room OLT sends to signal transmission counterclockwise in ring topology of ROADM node, and the ROADM node sends to signal transmission clockwise in ring topology of central machine room OLT.
When the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, central machine room OLT and ROADM1 ..., the signal between the ROADM i transmits with state by main, central machine room OLT and ROADM i+1 ..., the signal between the ROADM m transmits by stand-by state.
Referring to shown in Figure 2, central machine room OLT comprises k upper united mouth, the convergence module that links to each other with k upper united mouth, the n that links to each other with convergence module local side OTU, n local side optical switch (OS:Optical Switcher), n local side optical circulator (OC:Optical Circulator), an east orientation wavelength division multiplexer and a west are to wavelength division multiplexer, k is positive integer, the wavelength of n local side OTU correspondence is respectively λ 1, λ n, n local side OTU is corresponding one by one with the wavelength of n far-end OTU, and the local side OTU that corresponding wavelength is identical and far-end OTU coupling become a pair of.N local side optical circulator OC
1..., OC
nInclude first ring port, second ring port and the 3rd ring port, n local side optical switch OS
1..., OS
nBe 1 * 2 optical switch, each local side optical switch comprises first port, second port and the 3rd port.K upper united mouth links to each other with metro core nets such as IP/MPLS core net or mobile core networks, convergence module is finished converging of miscellaneous service, each local side OTU links to each other with a local side optical switch by a local side optical circulator, and each local side optical switch links to each other to wavelength division multiplexer with east orientation wavelength division multiplexer, west respectively.The local side optical circulator is finished single fiber bi-directional and two fine unidirectional conversion: the light that local side OTU sends enters optical circulator through first ring port of local side optical circulator, come out from second ring port of local side optical circulator, pass through the local side optical switch again, enter the east orientation wavelength division multiplexer or the west close ripple to wavelength division multiplexer, leading with under the state, the signal that local side OTU sends is sent to the east orientation wavelength division multiplexer through the local side optical switch, under stand-by state, the signal that local side OTU sends is sent to the west to wavelength division multiplexer through the local side optical switch; The light that comes out to the wavelength division multiplexer partial wave in east orientation wavelength division multiplexer or west through the local side optical switch, enters the local side optical circulator from second ring port of local side optical circulator, comes out from the 3rd ring port of local side optical circulator, sends to local side OTU.
When the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, with be connected ROADM1 ..., ROADM i the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU work with under the state main, be connected ROADM i+1 ..., ROADM m the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU under stand-by state, work.
The local side OTU that supposes corresponding wavelength λ 1 be connected ROADM1 ..., ROADM i far-end OTU in the wavelength of some far-end OTU correspondences identical, namely coupling become a pair of, local side optical switch OS then
1First port be communicated with second port, the local side OTU of corresponding wavelength λ 1 is communicated with the east orientation wavelength division multiplexer; The local side OTU that supposes corresponding wavelength λ n be connected ROADM i+1 ..., ROADM m far-end OTU in the wavelength of some far-end OTU correspondences identical, namely coupling becomes a pair of, then first port of local side optical switch OSn is communicated with the 3rd port, and the local side OTU of corresponding wavelength λ n is communicated with to wavelength division multiplexer with the west.
Referring to shown in Figure 3, each the ROADM node in the ring topology comprises a WSS(Wavelength SelectiveSwitch, wavelength-selective switches) and 4 ROADM optical switch: OS
1', OS
2', OS
3', OS
4', 4 ROADM optical switches are 1 * 2 optical switch, include first port, second port and the 3rd port, the WSS of each ROADM intranodal links to each other with at least one far-end OTU, each far-end OTU links to each other with the WSS of ROADM intranodal by a far-end optical circulator, the far-end OTU placement that can connected ROADM node exists together, also connected ROADM places at different place as required, for example far-end OTU is placed mobile base station or big customer place.OS
1' first port, OS
2' first port all link to each other OS with WSS
1' second port and OS
3' second port link to each other OS
2' second port and OS
3' the 3rd port link to each other OS
1' the 3rd port and OS
4' the 3rd port link to each other OS
2' the 3rd port and OS
4' second port link to each other.
The WSS of ROADM intranodal finish local wavelength on/following loop, and other wavelength is straight-through.Referring to shown in Figure 3, leading with under the state OS
3' first port, second port be communicated with OS
1' first port, second port be communicated with OS
2' first port, the 3rd port be communicated with OS
4' first port, second port be communicated with, signal advances/goes out OS from the west
3', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
4' go out from east/advance.Under stand-by state, OS
4' first port, the 3rd port be communicated with OS
1' first port, the 3rd port be communicated with OS
2' first port, second port be communicated with OS
3' first port, the 3rd port be communicated with, signal advances/goes out OS from east
4', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
3' from exporting to the west/advancing.
When the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, ROADM1 ..., all the ROADM optical switches among the ROADM i all be operated in main with under the state, ROADM i+1 ..., all the ROADM optical switches among the ROADM m all are operated under the stand-by state.
Referring to shown in Figure 3, the line interface of far-end OTU comprises circuit transmission interface L
TXWith circuit receiving interface L
RX, WSS is by the circuit transmission interface L of distal annular rim device and far-end OTU
TXWith circuit receiving interface L
RXLink to each other, far-end OTU comprises client's side transmission interface C
TXReceive interface C with client's side joint
RX, also can adopt TMUX(Tributary Multiplexing, the branch road multiple connection) and technology provides many group client side interfaces, and namely far-end OTU comprises a plurality of client's side transmission interface C
TXReceive interface C with a plurality of client's side joints
RXIf business is unidirectional, for example receive only or send, then far-end OTU includes only client's side transmission interface C
TXOr include only client's side joint and receive interface C
RXFar-end OTU can insert FTTx(Fiber-to-the-x, and optical fiber inserts) user, DSLAM(Digital Subscriber Line Access Multiplexer, digital subscriber line access multiplex), big customer's special line, mobile base station etc.
When a pair of local side OTU, the far-end OTU that is operated in same wavelength is used for the PON access, PHY(Physical Layer among the PON, physical layer) layer function (as the reception etc. that happens suddenly) is realized in client's side interface of far-end OTU, MAC(Media Access Control among the PON, MAC layer)/and TC(Transmission Convergence, Transmission Convergence) function (as adaptive, Dynamic Bandwidth Allocation, range finding etc.) realizes in local side OTU.
On the basis of above-mentioned convergent type metropolitan area wavelength-division access network system, the embodiment of the invention also provides a kind of convergent type metropolitan area wavelength-division cut-in method, may further comprise the steps:
With under the state, central machine room OLT sends to signal transmission clockwise in ring topology of ROADM node main, namely from west that the east orientation of last ROADM node sends to back one ROADM node to; The signal that the ROADM node sends to central machine room OLT is transmission counterclockwise in ring topology, namely from the west of last ROADM node to the east orientation that sends to back one ROADM node; Under stand-by state, central machine room OLT sends to signal transmission counterclockwise in ring topology of ROADM node, and the ROADM node sends to signal transmission clockwise in ring topology of central machine room OLT.
When the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, central machine room OLT and ROADM1 ..., the signal between the ROADM i transmits with state by main, central machine room OLT and ROADM i+1 ..., the signal between the ROADM m transmits by stand-by state.
The light that local side OTU sends enters optical circulator through first ring port of local side optical circulator, come out from second ring port of local side optical circulator, pass through the local side optical switch again, enter the east orientation wavelength division multiplexer or the west close ripple to wavelength division multiplexer, leading with under the state, the signal that local side OTU sends is sent to the east orientation wavelength division multiplexer through the local side optical switch, and under stand-by state, the signal that local side OTU sends is sent to the west to wavelength division multiplexer through the local side optical switch; The light that comes out to the wavelength division multiplexer partial wave in east orientation wavelength division multiplexer or west through the local side optical switch, enters the local side optical circulator from second ring port of local side optical circulator, comes out from the 3rd ring port of local side optical circulator, sends to local side OTU.
When the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, with be connected ROADM1 ..., ROADM i the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU work with under the state main, be connected ROADM i+1 ..., ROADM m the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU under stand-by state, work.
The local side OTU that supposes corresponding wavelength λ 1 be connected ROADM1 ..., ROADM i far-end OTU in the wavelength of some far-end OTU correspondences identical, namely coupling become a pair of, local side optical switch OS then
1First port be communicated with second port, the local side OTU of corresponding wavelength λ 1 is communicated with the east orientation wavelength division multiplexer; The local side OTU that supposes corresponding wavelength λ n be connected ROADM i+1 ..., ROADM m far-end OTU in the wavelength of some far-end OTU correspondences identical, namely coupling becomes a pair of, then first port of local side optical switch OSn is communicated with the 3rd port, and the local side OTU of corresponding wavelength λ n is communicated with to wavelength division multiplexer with the west.
The WSS of ROADM intranodal finish local wavelength on/following loop, and other wavelength is straight-through.Referring to shown in Figure 3, leading with under the state OS
3' first port, second port be communicated with OS
1' first port, second port be communicated with OS
2' first port, the 3rd port be communicated with OS
4' first port, second port be communicated with, signal advances/goes out OS from the west
3', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
4' go out from east/advance.Under stand-by state, OS
4' first port, the 3rd port be communicated with OS
1' first port, the 3rd port be communicated with OS
2' first port, second port be communicated with OS
3' first port, the 3rd port be communicated with, signal advances/goes out OS from east
4', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
3' from exporting to the west/advancing.
When the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, ROADM1 ..., all the ROADM optical switches among the ROADM i all be operated in main with under the state, ROADM i+1 ..., all the ROADM optical switches among the ROADM m all are operated under the stand-by state.
When a pair of local side OTU, the far-end OTU that is operated in same wavelength is used for the PON access, PHY(Physical Layer among the PON, physical layer) layer function (as the reception etc. that happens suddenly) is realized in client's side interface of far-end OTU, MAC(Media Access Control among the PON, MAC layer)/and TC(Transmission Convergence, Transmission Convergence) function (as adaptive, Dynamic Bandwidth Allocation etc.) realizes in local side OTU.
Those skilled in the art can carry out various modifications and variations to the embodiment of the invention, if these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then these modifications and modification are also within protection scope of the present invention.
The content of not describing in detail in the specification is for well known to a person skilled in the art prior art.
Claims (17)
1. convergent type metropolitan area wavelength-division access network system, comprise the optical line terminal OLT that is positioned at central machine room, m Reconfigurable Optical Add/drop Multiplexer ROADM node and n far-end optical transport unit OTU, m, n is positive integer, m 〉=1, n 〉=m, the wavelength of n far-end OTU correspondence is respectively λ 1, λ n, it is characterized in that: be the networks converge point with the central machine room, central machine room OLT is connected by optical fiber in turn with m ROADM node, constitute ring topology, m ROADM node in the ring topology is by being numbered ROADM1 clockwise, ROADM2, ROADM m-1, ROADM m, with east orientation, the closure of m ROADM node in ring topology is always represented in the west, according to clockwise direction, the east orientation of last ROADM node with the back one ROADM node the west to linking to each other, has only an optical fiber between adjacent two ROADM nodes, each ROADM node connects at least one far-end OTU, each far-end OTU is linked into the business of its region in the ring topology by the ROADM node that links to each other with this far-end OTU, and each ROADM node carries out the straight-through of respective wavelength passage, on/following route; With under the state, central machine room OLT sends to signal transmission clockwise in ring topology of ROADM node main, namely from west that the east orientation of last ROADM node sends to back one ROADM node to; The signal that the ROADM node sends to central machine room OLT is transmission counterclockwise in ring topology, namely from the west of last ROADM node to the east orientation that sends to back one ROADM node; Under stand-by state, central machine room OLT sends to signal transmission counterclockwise in ring topology of ROADM node, and the ROADM node sends to signal transmission clockwise in ring topology of central machine room OLT.
2. convergent type metropolitan area wavelength-division access network system as claimed in claim 1, it is characterized in that: when the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, central machine room OLT and ROADM1 ..., the signal between the ROADM i transmits with state by main, central machine room OLT and ROADM i+1 ..., the signal between the ROADM m transmits by stand-by state.
3. convergent type metropolitan area wavelength-division access network system as claimed in claim 2, it is characterized in that: described central machine room OLT comprises k upper united mouth, the convergence module that links to each other with k upper united mouth, the n that links to each other with convergence module local side OTU, n local side optical switch OS, n local side optical circulator OC, an east orientation wavelength division multiplexer and a west are to wavelength division multiplexer, k is positive integer, the wavelength of n local side OTU correspondence is respectively λ 1, λ n, n local side OTU is corresponding one by one with the wavelength of n far-end OTU, and the local side OTU that corresponding wavelength is identical and far-end OTU coupling become a pair of; N local side optical circulator OC
1..., OC
nInclude first ring port, second ring port and the 3rd ring port, n local side optical switch OS
1..., OS
nBe 1 * 2 optical switch, each local side optical switch comprises first port, second port and the 3rd port, k upper united mouth links to each other with the metro core net, convergence module is finished converging of miscellaneous service, each local side OTU links to each other with a local side optical switch by a local side optical circulator, and each local side optical switch links to each other to wavelength division multiplexer with east orientation wavelength division multiplexer, west respectively; The local side optical circulator is finished single fiber bi-directional and two fine unidirectional conversion: the light that local side OTU sends enters optical circulator through first ring port of local side optical circulator, come out from second ring port of local side optical circulator, pass through the local side optical switch again, enter the east orientation wavelength division multiplexer or the west close ripple to wavelength division multiplexer, leading with under the state, the signal that local side OTU sends is sent to the east orientation wavelength division multiplexer through the local side optical switch, under stand-by state, the signal that local side OTU sends is sent to the west to wavelength division multiplexer through the local side optical switch; The light that comes out to the wavelength division multiplexer partial wave in east orientation wavelength division multiplexer or west through the local side optical switch, enters the local side optical circulator from second ring port of local side optical circulator, comes out from the 3rd ring port of local side optical circulator, sends to local side OTU.
4. convergent type metropolitan area wavelength-division access network system as claimed in claim 3, it is characterized in that: when the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, with be connected ROADM1 ..., ROADM i the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU work with under the state main, be connected ROADM i+1 ..., ROADM m the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU under stand-by state, work.
5. convergent type metropolitan area wavelength-division access network system as claimed in claim 4, it is characterized in that: the local side OTU of corresponding wavelength λ 1 be connected ROADM1 ..., ROADM i far-end OTU in the wavelength of some far-end OTU correspondences when identical, first port of local side optical switch OS1 is communicated with second port, and the local side OTU of corresponding wavelength λ 1 is communicated with the east orientation wavelength division multiplexer; The local side OTU of corresponding wavelength λ n be connected ROADM i+1 ..., ROADM m far-end OTU in the wavelength of some far-end OTU correspondences when identical, first port of local side optical switch OSn is communicated with the 3rd port, and the local side OTU of corresponding wavelength λ n is communicated with to wavelength division multiplexer with the west.
6. convergent type metropolitan area wavelength-division access network system as claimed in claim 5 is characterized in that: each the ROADM node in the described ring topology comprises a wavelength-selective switches WSS and 4 ROADM optical switch: OS
1', OS
2', OS
3', OS
4', 4 ROADM optical switches are 1 * 2 optical switch, include first port, second port and the 3rd port, and the WSS of each ROADM intranodal links to each other with at least one far-end OTU, each far-end OTU links to each other OS by a far-end optical circulator with the WSS of ROADM intranodal
1' first port, OS
2' first port all link to each other OS with WSS
1' second port and OS
3' second port link to each other OS
2' second port and OS
3' the 3rd port link to each other OS
1' the 3rd port and OS
4' the 3rd port link to each other OS
2' the 3rd port and OS
4' second port link to each other; The WSS of ROADM intranodal finish local wavelength on/following loop, and other wavelength is straight-through; Leading with under the state OS
3' first port, second port be communicated with OS
1' first port, second port be communicated with OS
2' first port, the 3rd port be communicated with OS
4' first port, second port be communicated with, signal advances/goes out OS from the west
3', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
4' go out from east/advance; Under stand-by state, OS
4' first port, the 3rd port be communicated with OS
1' first port, the 3rd port be communicated with OS
2' first port, second port be communicated with OS
3' first port, the 3rd port be communicated with, signal advances/goes out OS from east
4', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
3' from exporting to the west/advancing.
7. convergent type metropolitan area wavelength-division access network system as claimed in claim 6, it is characterized in that: when the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, ROADM1 ..., all the ROADM optical switches among the ROADM i all be operated in main with under the state, ROADM i+1 ..., all the ROADM optical switches among the ROADM m all are operated under the stand-by state.
8. convergent type metropolitan area wavelength-division access network system as claimed in claim 7, it is characterized in that: the placement that exists together of the connected ROADM node of described far-end OTU, perhaps connected ROADM places at different place as required, and the line interface of far-end OTU comprises circuit transmission interface L
TXWith circuit receiving interface L
RX, WSS is by the circuit transmission interface L of distal annular rim device and far-end OTU
TXWith circuit receiving interface L
RXLink to each other, far-end OTU comprises client's side transmission interface C
TXReceive interface C with client's side joint
RX, perhaps adopt branch road multiple connection TMUX technology that many group client side interfaces are provided, namely far-end OTU comprises a plurality of client's side transmission interface C
TXReceive interface C with a plurality of client's side joints
RXIf business is unidirectional, receive only or send, then far-end OTU includes only client's side transmission interface C
TXOr include only client's side joint and receive interface C
RX, far-end OTU incoming fiber optic inserts FTTx user, digital subscriber line access multiplex DSLAM, big customer's special line or mobile base station.
9. convergent type metropolitan area wavelength-division access network system as claimed in claim 8, it is characterized in that: when a pair of local side OTU, the far-end OTU that is operated in same wavelength is used for the PON access, physical layer function among the PON realizes that in client's side interface of far-end OTU the MAC layer MAC/ Transmission Convergence TC function among the PON realizes in local side OTU.
10. convergent type metropolitan area wavelength-division cut-in method based on each described access network system in the claim 1 to 9 may further comprise the steps:
With under the state, central machine room OLT sends to signal transmission clockwise in ring topology of ROADM node main, namely from west that the east orientation of last ROADM node sends to back one ROADM node to; The signal that the ROADM node sends to central machine room OLT is transmission counterclockwise in ring topology, namely from the west of last ROADM node to the east orientation that sends to back one ROADM node; Under stand-by state, central machine room OLT sends to signal transmission counterclockwise in ring topology of ROADM node, and the ROADM node sends to signal transmission clockwise in ring topology of central machine room OLT.
11. convergent type as claimed in claim 10 metropolitan area wavelength-division cut-in method, it is characterized in that: when the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, central machine room OLT and ROADM1 ..., the signal between the ROADM i transmits with state by main, central machine room OLT and ROADM i+1 ..., the signal between the ROADM m transmits by stand-by state.
12. convergent type as claimed in claim 11 metropolitan area wavelength-division cut-in method, it is characterized in that: the light that local side OTU sends enters optical circulator through first ring port of local side optical circulator, come out from second ring port of local side optical circulator, pass through the local side optical switch again, enter the east orientation wavelength division multiplexer or the west close ripple to wavelength division multiplexer, leading with under the state, the signal that local side OTU sends is sent to the east orientation wavelength division multiplexer through the local side optical switch, under stand-by state, the signal that local side OTU sends is sent to the west to wavelength division multiplexer through the local side optical switch; The light that comes out to the wavelength division multiplexer partial wave in east orientation wavelength division multiplexer or west through the local side optical switch, enters the local side optical circulator from second ring port of local side optical circulator, comes out from the 3rd ring port of local side optical circulator, sends to local side OTU.
13. convergent type as claimed in claim 12 metropolitan area wavelength-division cut-in method, it is characterized in that: when the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, with be connected ROADM1 ..., ROADM i the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU work with under the state main, be connected ROADM i+1 ..., ROADM m the central machine room OLT of far-end OTU correspondence in the local side optical switch that is communicated with of local side OTU under stand-by state, work.
14. convergent type as claimed in claim 13 metropolitan area wavelength-division cut-in method is characterized in that: the local side OTU of corresponding wavelength λ 1 be connected ROADM1 ..., ROADM i far-end OTU in the wavelength of some far-end OTU correspondences when identical, local side optical switch OS
1First port be communicated with second port, the local side OTU of corresponding wavelength λ 1 is communicated with the east orientation wavelength division multiplexer; The local side OTU of corresponding wavelength λ n be connected ROADM i+1 ..., ROADMm far-end OTU in the wavelength of some far-end OTU correspondences when identical, first port of local side optical switch OSn is communicated with the 3rd port, and the local side OTU of corresponding wavelength λ n is communicated with to wavelength division multiplexer with the west.
15. convergent type as claimed in claim 14 metropolitan area wavelength-division cut-in method is characterized in that: the WSS of ROADM intranodal finish local wavelength on/following loop, and other wavelength is straight-through; Leading with under the state OS
3' first port, second port be communicated with OS
1' first port, second port be communicated with OS
2' first port, the 3rd port be communicated with OS
4' first port, second port be communicated with, signal advances/goes out OS from the west
3', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
4' go out from east/advance; Under stand-by state, OS
4' first port, the 3rd port be communicated with OS
1' first port, the 3rd port be communicated with OS
2' first port, second port be communicated with OS
3' first port, the 3rd port be communicated with, signal advances/goes out OS from east
4', through OS
1' advancing/go out WSS, straight-through wavelength is through OS
2', OS
3' from exporting to the west/advancing.
16. convergent type as claimed in claim 15 metropolitan area wavelength-division cut-in method, it is characterized in that: when the optical fiber between ROADM i in the ring topology and the ROADM i+1 breaks down disconnection, i is positive integer, ROADM1 ..., all the ROADM optical switches among the ROADM i all be operated in main with under the state, ROADM i+1 ..., all the ROADM optical switches among the ROADM m all are operated under the stand-by state.
17. convergent type as claimed in claim 16 metropolitan area wavelength-division cut-in method, it is characterized in that: when a pair of local side OTU, the far-end OTU that is operated in same wavelength is used for the PON access, physical layer function among the PON realizes that in client's side interface of far-end OTU the MAC layer MAC/ Transmission Convergence TC function among the PON realizes in local side OTU.
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