CN101478706B - Optical path sharing protection method in DWDM optical transmission system - Google Patents
Optical path sharing protection method in DWDM optical transmission system Download PDFInfo
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- CN101478706B CN101478706B CN2009100960024A CN200910096002A CN101478706B CN 101478706 B CN101478706 B CN 101478706B CN 2009100960024 A CN2009100960024 A CN 2009100960024A CN 200910096002 A CN200910096002 A CN 200910096002A CN 101478706 B CN101478706 B CN 101478706B
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Abstract
The present invention discloses an optical pass sharing protecting method in DWDM optical transmission system. On two optical transmission units which requires to provide protecting node in the transmission system, two sharing protecting units with same structure and four input optical signal monitoring units which also have same structure form a protecting device. The invention has the advantage that the operation between nodes is totally harmonized by the on-off state of signal. The coding/decoding and signal analysis are not required similarly to protection to switching protocol by APS. The protecting device of the invention has the advantages of simple structure, no effect to the service structure of existing OADM looped network, and no change to the structure of network device. The purpose of service protection can be realized through directly adding a sharing passage protecting chassis. Furthermore the automatic protection switching and recovering can be realized without protocol software management. The restriction of loop node number does not exist. The time for switching and recovering is irrelevant to the length of loop and node number. The protecting device of the invention also has the characteristics of strong extendibility, convenient upgrading and reconstruction of network, simple and reliable action, multi-point failure protection, etc.
Description
Technical field
The present invention relates to the light path share protect method in a kind of optical transmission system, especially relate to the light path share protect method in a kind of DWDM optical transmission system.
Background technology
Current main optical transport technology is SDH and DWDM; with respect to the SDH technology; its network protection recovery technology of ROADM and OTN system that belongs to the DWDM category all is in relative weak tendency status, and the scheme kind of these resist technologies, protection reliability, applicable elements etc. are all disproportionate with respect to the importance of transport service that network is born.Main DWDM resist technology is based on the two fine unidirectional Optical Line Protection and the light path protection of concurrent choosing receipts technology at present, and two fine bi-directional light protecting circuit loops are then used because of looped network self-excitation risk is few.The share protect that is widely used in SDH seldom occurs in dwdm system because of the shortcoming of technical scheme for a long time.The vacant transmission capacity that present general DWDM resist technology all needs to equate with service aisle to provide protection to the transmission capacity of service aisle; and in shared light path protection; particularly in the ring network structure of profile business, can allow a plurality of service signals share a protection passage, thereby greatly improve the utilance of network transmission capacity.Breakthrough has appearred in this in recent years light path share protect technology, and obtains admitting of International Standards Organization, however because the restriction of technical patent and less putting it over.And the existence that existing shared light path resist technology has needs the host-host protocol coordinated management, has improved the complexity of system, has reduced protection and has switched speed; The light signal that also requires the monitoring and protecting passage that has, and carry out analysis and Control, improved the complexity and the construction cost of system, also reduced system reliability; The harm that still is difficult to bear loop self-excited vibration that has, thus the engineering that has influenced this technology is used.
Summary of the invention
Technical problem to be solved by this invention provides a kind of business structure that does not influence existing OADM looped network; do not change the structure of the network equipment; need not protocol software management can realize APS and recovery; be not subjected to the restriction of loop node quantity, and protection switch with time of recovering also with the irrelevant DWDM optical transmission system of the length of loop and number of nodes in light path share protect method.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: the light path share protect method in a kind of DWDM optical transmission system; needs in transmission system provide on two optical convering units of protection node; constitute protective device by two identical share protect unit and four identical input optical signal monitoring means of structure of structure; the input of wherein two input optical signal monitoring means is connected with protection path output with the active channel output of corresponding sending node respectively; the output of the input optical signal monitoring means that it is connected with the active channel output is connected with the active channel input of a share protect unit; the input of an optical convering unit on the path received signal output of this share protect unit and the node is connected; the output of this optical convering unit is connected with the path transmission signal input part of another share protect unit; and the protection path input of this another share protect unit is connected with the output of the input optical signal monitoring means of the protection path output that is connected to sending node; and the input of another optical convering unit on the path received signal output of this another share protect unit and the node is connected; the output of this another optical convering unit is connected with the path transmission signal input part of the share protect unit of the output of the input optical signal monitoring means of the active channel output that is connected to sending node; when optical transmission line interrupts; the input optical signal monitoring means of receiving node monitoring path input signal can not receive the light signal of sending node; at this moment; to be connected from being connected with protection path input to switch to the protection path output that monitors the share protect unit that input optical signal monitoring means that input service path light loses is connected with path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of another share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; and send periodic hit information from the active channel output of this share protect unit and excite sending node to send input service path light to lose alarm; at this moment; the protection path output of the share protect unit that sending node is connected with the input optical signal monitoring means that monitors hit information is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of another share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; after breakpoint is repaired; the input optical signal monitoring means of receiving node monitors the light signal of sending node; treat that signal stabilization keeps; after determining normally; the share protect unit that this node is all recovers ortho states; and send guard signal to sending node and lose hit information, make the share protect device of sending node recover ortho states.
On first optical convering unit that described two optical convering units are left end and second optical convering unit of right-hand member; described two share protect unit are the first share protect unit and the second share protect unit; described four input optical signal monitoring means are the first input optical signal monitoring means; the second input optical signal monitoring means; the 3rd input optical signal monitoring means and the 4th input optical signal monitoring means; the input of the described first input optical signal monitoring means is connected with the active channel output of left end node; the output of the described first input optical signal monitoring means is connected with the active channel input of the described first share protect unit; the input of the described second input optical signal monitoring means is connected with the protection path output of left end node; the output of the described second input optical signal monitoring means is connected with the protection path input of the described second share protect unit; the input of described the 3rd input optical signal monitoring means is connected with the active channel output of right-hand member node; the output of described the 3rd input optical signal monitoring means is connected with the active channel input of the described second share protect unit; the input of described the 4th input optical signal monitoring means is connected with the protection path output of right-hand member node; the output of described the 4th input optical signal monitoring means is connected with the protection path input of the described first share protect unit; the input of first optical convering unit on the path received signal output of the first share protect unit and the described node is connected; the output of described first optical convering unit sends signal input part with the path of the described second share protect unit and is connected; the input of second optical convering unit on the path received signal output of the second share protect unit and the described node is connected; the output of described second optical convering unit sends signal input part with the path of the described first share protect unit and is connected; described sending node is the left end node; the described first input optical signal monitoring means monitors after input service path light loses; the protection path output of the first share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of the second share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; and send periodic hit information from the active channel output of the second share protect unit and excite the left end node to send input service path light to lose alarm; at this moment; the protection path output of the second share protect unit of left end node is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of the first share protect unit of left end node is connected from being connected with protection path input to switch to path transmission signal input part; after breakpoint is repaired; the first input optical signal monitoring means of receiving node monitors the light signal of sending node; treat that signal stabilization keeps; after determining normally; the share protect unit that this node is all recovers ortho states; and end node sends guard signal and loses hit information left, makes the share protect device of left end node recover ortho states.
On first optical convering unit that described two optical convering units are left end and second optical convering unit of right-hand member; described two share protect unit are the first share protect unit and the second share protect unit; described four input optical signal monitoring means are the first input optical signal monitoring means; the second input optical signal monitoring means; the 3rd input optical signal monitoring means and the 4th input optical signal monitoring means; the input of the described first input optical signal monitoring means is connected with the active channel output of left end node; the output of the described first input optical signal monitoring means is connected with the active channel input of the described first share protect unit; the input of the described second input optical signal monitoring means is connected with the protection path output of left end node; the output of the described second input optical signal monitoring means is connected with the protection path input of the described second share protect unit; the input of described the 3rd input optical signal monitoring means is connected with the active channel output of right-hand member node; the output of described the 3rd input optical signal monitoring means is connected with the active channel input of the described second share protect unit; the input of described the 4th input optical signal monitoring means is connected with the protection path output of right-hand member node; the output of described the 4th input optical signal monitoring means is connected with the protection path input of the described first share protect unit; the input of first optical convering unit on the path received signal output of the first share protect unit and the described node is connected; the output of described first optical convering unit sends signal input part with the path of the described second share protect unit and is connected; the input of second optical convering unit on the path received signal output of the second share protect unit and the described node is connected; the output of described second optical convering unit sends signal input part with the path of the described first share protect unit and is connected; described sending node is the right-hand member node; described the 3rd input optical signal monitoring means monitors after input service path light loses; the protection path output of the second share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of the first share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; and send periodic hit information from the active channel output of the first share protect unit and excite the right-hand member node to send input service path light to lose alarm; at this moment; the protection path output of the first share protect unit of right-hand member node is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of the second share protect unit of right-hand member node is connected from being connected with protection path input to switch to path transmission signal input part; after breakpoint is repaired; the 3rd input optical signal monitoring means of receiving node monitors the light signal of sending node; treat that signal stabilization keeps; after determining normally; the share protect unit that this node is all recovers ortho states; and end node sends guard signal and loses hit information to the right, makes the share protect device of right-hand member node recover ortho states.
Described share protect unit is by 2 * 2 optical switches; 1 * 2 optical switch; each composition of 1 * 1 optical switch and optical coupler; the active channel input of described 2 * 2 optical switches is connected with the output of the input optical signal monitoring means of monitoring path input signal; the protection path input of described 2 * 2 optical switches is connected with the output of the input optical signal monitoring means of monitoring and protecting path input signal; the input of an optical convering unit in the path received signal output of described 2 * 2 optical switches and described two optical convering units is connected; the protection path output of described 2 * 2 optical switches is connected with a swing arm of described 1 * 2 optical switch; the output that the path of described optical coupler sends another optical convering unit in signal input part and described two optical convering units is connected; an output of described optical coupler is connected with another swing arm of described 1 * 2 optical switch; another output of described optical coupler is connected with the input of described 1 * 1 optical switch; the output of described 1 * 1 optical switch is connected with the active channel output, and the arm of deciding of described 1 * 2 optical switch is connected with protection path output.
Described periodic hit information is produced by described 1 * 1 optical switch, and the hit duration is greater than 2ms, and less than cycle duration.
Compared with prior art; advantage of the present invention is that internodal work relies on the on off operating mode of signal to coordinate fully; need not protect as APS and need to carry out encoding and decoding and signal analysis as the turning protocol; protective device of the present invention is simple in structure; do not influence the business structure of existing OADM looped network; do not change the structure of the network equipment; directly install shared path protection machine dish additional and can realize the purpose of service protection; and need not protocol software management can realize APS and recovery; be not subjected to the restriction of loop node quantity; protection is switched with the time of recovering also irrelevant with the length and the number of nodes of loop; extensibility is extremely strong; be convenient to the upgrading of network, and have the action simple and reliable, can protect characteristics such as multiple spot fault.
Description of drawings
Fig. 1 is the structural representation of the protective device of the present invention's use;
Fig. 2 is for being in the signal flow diagram of normal operating conditions between two nodes of the present invention;
Guard mode signal flow diagram when the light signal that Fig. 3 sends for the left end node in two nodes of the present invention opens circuit;
The signal flow diagram of guard mode when Fig. 4 opens circuit for multinode receiving optical signals of the present invention;
Fig. 5 is that in running order schematic diagram of share protect device of the present invention and port are communicated with sketch;
Fig. 6 is communicated with sketch for schematic diagram and the port that share protect device of the present invention is in guard mode A;
Fig. 7 is communicated with sketch for schematic diagram and the port that share protect device of the present invention is in guard mode B.。
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Light path share protect method in a kind of DWDM optical transmission system, each node in the transmission system is provided with two optical convering units and receives and dispatches the light signal of two transmission directions respectively, the light signal of first optical convering unit 1 transmitting-receiving left end transmission direction and the light signal of second optical convering unit, 2 transmitting-receiving right-hand member transmission directions, protective device is that the first share protect unit 3 is the first input optical signal monitoring means 5 with the second share protect unit 4 and four identical input optical signal monitoring means of structure by two identical share protect unit of structure, the second input optical signal monitoring means 6, the 3rd input optical signal monitoring means 7 and the 4th input optical signal monitoring means 8 constitute, the first share protect unit 1 is by 2 * 2 optical switches 01,1 * 2 optical switch 02,1 * 1 optical switch 03 and optical coupler 04 each composition, the active channel input a1 of 2 * 2 optical switches 01 is connected with the output of the first input optical signal monitoring means 5, the protection path input b1 of 2 * 2 optical switches 01 is connected with the output of the 4th input optical signal monitoring means 8, the path received signal output e1 of 2 * 2 optical switches 01 is connected with the input of first optical convering unit 1, the protection path output of 2 * 2 optical switches 01 is connected with a swing arm of 1 * 2 optical switch 02, the path of optical coupler 04 sends signal input part f1 and is connected with the output of second optical convering unit 2, an output of optical coupler 04 is connected with another swing arm of 1 * 2 optical switch 02, another output of optical coupler 04 is connected with the input of 1 * 1 optical switch 03, the output of 1 * 1 optical switch 03 is connected with right-hand member active channel output c1, the arm of deciding of 1 * 2 optical switch 03 is connected with left end protection path output d1, the second share protect unit 2 is also by 2 * 2 optical switches 01,1 * 2 optical switch 02,1 * 1 optical switch 03 and optical coupler 04 each composition, the active channel input a2 of 2 * 2 optical switches 01 is connected with the output of the 3rd input optical signal monitoring means 7, the protection path input b2 of 2 * 2 optical switches 01 is connected with the output of the second input optical signal monitoring means 6, the path received signal output e2 of 2 * 2 optical switches 01 is connected with the input of second optical convering unit 2, the protection path output of 2 * 2 optical switches 01 is connected with a swing arm of 1 * 2 optical switch 02, the path of optical coupler 04 sends signal input part f2 and is connected with the output of first optical convering unit 1, an output of optical coupler 04 is connected with another swing arm of 1 * 2 optical switch 02, another output of optical coupler 04 is connected with the input of 1 * 1 optical switch 03, the output of 1 * 1 optical switch 03 is connected with active channel output c2, the arm of deciding of 1 * 2 optical switch 02 is connected with right-hand member protection path output d2, the input of the first input optical signal monitoring means 5 is connected with the active channel output of left end node, the input of the second input optical signal monitoring means 6 is connected with the protection path output of left end node, the input of the 3rd input optical signal monitoring means 7 is connected with the active channel output of right-hand member node, the input of the 4th input optical signal monitoring means 8 is connected with the protection path output of right-hand member node, when the optical transmission line of left end node interrupts, receiving node can not receive the light signal of sending node, the first input optical signal monitoring means 5 monitors after input service path light loses, the first share protect unit 3 is switched to the state of guard mode A: 2 * 2 optical switches 01 will protect path input b1 to be communicated with path received signal output e1, simultaneously active channel input a1 is linked to each other with a swing arm of 1 * 2 optical switch 02, then that this and 2 * 2 optical switches 01 are the interconnected swing arm of 1 * 2 optical switch 02 is decided arm and is disconnected with it, make active channel input a1 and left end protect path output d1 not to be connected; Path sends signal input part f1 and is divided into two ports outputs by optical coupler 04, and one of them port links to each other with another swing arm of 1 * 2 optical switch 02, and is switched to it and decides arm, makes path send signal input part f1 and left end is protected path output d1 connection; Another port is communicated with right-hand member active channel output c1 by 1 * 1 optical switch 03.Promptly, protection path input b1 and path received signal output e1 are connected by the switching of several optical switches; Path transmission signal input part f1 is divided into two-way and connects with right-hand member active channel output c1 and left end protection path output d1 respectively.And the second share protect unit 4 is switched to the state of guard mode B: 2 * 2 optical switches 01 are communicated with active channel input a2 with path received signal output e2, to protect path input b2 to link to each other simultaneously with a swing arm of 1 * 2 optical switch 02, then that this and 2 * 2 optical switches 01 are the interconnected swing arm of 1 * 2 optical switch 02 is decided arm and is disconnected with it, make protection path input b2 and right-hand member protect path output d2 not to be connected; Path sends signal input part f2 and is divided into two ports outputs by optical coupler 04, and one of them port links to each other with another swing arm of 1 * 2 optical switch 02, and is switched to it and decides arm, makes path send signal input part f2 and right-hand member is protected path output d2 connection; And another port is communicated with left end active channel output c2 by 1 * 1 optical switch 03.Promptly, active channel input a2 and path received signal output e2 are connected by the switching of several optical switches; Path transmission signal input part f2 is divided into two-way and connects with left end active channel output c2 and right-hand member protection path output d2 respectively.And send the hit information that periodically produces by 1 * 1 optical switch 03 from the left end active channel output c2 of the second share protect unit 4 and excite the left end node to send input service path light to lose alarm, the hit duration is greater than 2ms, and less than cycle duration.At this moment; the protection path output of the second share protect unit 4 of left end node is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of the first share protect unit 3 of left end node is connected from being connected with protection path input to switch to path transmission signal input part; after breakpoint is repaired; the first input optical signal monitoring means 5 of receiving node monitors the light signal of sending node; treat that signal stabilization keeps; after determining normally; the first share protect unit 3 and the second share protect unit 4 are recovered ortho states; and end node sends guard signal and loses hit information left, makes the share protect device of left end node recover ortho states.
Otherwise, when the optical transmission line of right-hand member node interrupts, receiving node can not receive the light signal of sending node, the 3rd input optical signal monitoring means 7 monitors after input service path light loses, the second share protect unit 4 is switched to the state of guard mode A: switch, protection path input b1 and path received signal output e1 are connected; Path transmission signal input part f1 is divided into two-way and connects with right-hand member active channel output c1 and left end protection path output d1 respectively.And the second share protect unit 4 is switched to the state of guard mode B, its course of work is identical.
The share protect unit has three kinds of operating states, is respectively operating state, guard mode A and guard mode B.Optical switch action under the various states is respectively as Fig. 5, Fig. 6 and shown in Figure 7, and 1 * 1 optical switch 03 wherein is connection in various states, and it only is used to send the hit signal.For simple table illustrates each port UNICOM state of every kind of state, all be marked with port among each figure and be communicated with sketch.
Fig. 5 is illustrated in the share protect unit under the operating state, 2 * 2 optical switches 01 are communicated with active channel input a with path received signal output e, to protect path input b to link to each other simultaneously with a swing arm of 1 * 2 optical switch 02, then that this and 2 * 2 optical switches 01 are the interconnected swing arm of 1 * 2 optical switch 02 is decided arm with it and is communicated with, and protection path input b and protection path output d are connected; Path sends signal input part f and is divided into two port outputs by optical coupler, and one of them port links to each other with another swing arm of 1 * 2 optical switch 02, but will not connect, and another port is communicated with active channel output c by 1 * 1 optical switch 03.Promptly, active channel input a and path received signal output e are connected by the switching of several optical switches; Protection path input b and protection path output d connect; Path sends signal input part f and active channel output c connects.
Fig. 6 has expressed the switching state of share protect unit each optical switch when guard mode A: 2 * 2 optical switches 01 will protect path input b to be communicated with path received signal output e, simultaneously active channel input a is linked to each other with a swing arm of 1 * 2 optical switch 02, then that this and 2 * 2 optical switches 01 are the interconnected swing arm of 1 * 2 optical switch 02 is decided arm and is disconnected with it, active channel input a and protection path output d are not connected; Path sends signal input part f and is divided into two ports outputs by optical coupler, and one of them port links to each other with another swing arm of 1 * 2 optical switch 02, and is switched to it and decides arm, makes path send signal input part f and protects path output d connection; Another port is communicated with active channel output c by 1 * 1 optical switch 03.Promptly, protection path input b and path received signal output e are connected by the switching of several optical switches; Path transmission signal input part f is divided into two-way and connects with active channel output c and protection path output d respectively.
Fig. 7 has expressed the switching state of share protect unit each optical switch when guard mode B: 2 * 2 optical switches 01 are communicated with active channel input a with path received signal output e, to protect path input b to link to each other simultaneously with a swing arm of 1 * 2 optical switch 02, then that this and 2 * 2 optical switches 01 are the interconnected swing arm of 1 * 2 optical switch 02 is decided arm and is disconnected with it, protection path input b and protection path output d are not connected; Path sends signal input part f and is divided into two ports outputs by optical coupler, and one of them port links to each other with another swing arm of 1 * 2 optical switch 02, and is switched to it and decides arm, makes path send signal input part f and protects path output d connection; And another port is communicated with active channel output c by 1 * 1 optical switch 03.Promptly, active channel input a and path received signal output e are connected by the switching of several optical switches; Path transmission signal input part f is divided into two-way and connects with active channel output c and protection path output d respectively.
During two node proper communications; each share protect unit is all in running order; promptly the transmission signal of two node optical retransmission units is all sent into the output of line work path by the share protect unit; the protection path is then straight-through; node will be protected the output of path and active channel to close ripple at delivery outlet to transmit in optical link; the signal that then will close in the swash road in the node input port is decomposed into active channel and the input of protection path according to wavelength relationship; and active channel input is connected to the input of corresponding optical convering unit, as shown in Figure 2.
Node A left end links to each other with the active channel input a1 of the first share protect unit 3 by the input of the line work path behind the input signal monitoring means 11, this first share protect unit 3 is communicated to path received signal output e1 with it, and links to each other with the input of first optical convering unit 1 of node A; The path that the output of this first optical convering unit 1 connects the second share protect unit 4 sends signal input part f2, and the second share protect unit 4 is communicated to the output 13 of active channel output c2 as node A left end line work path with it;
The Node B right-hand member links to each other with the active channel input a2 of the second share protect unit 4 by the input of the line work path behind the input signal monitoring means 11, this second share protect unit 4 is communicated to path received signal output e2 with it, and links to each other with the input of second optical convering unit 2 of Node B; The path that the output of this second optical convering unit 2 connects the first share protect unit 3 sends signal input part f1, and the first share protect unit 3 is communicated to the output 13 of active channel output c1 as Node B right-hand member line work path with it;
Node A sends signal input part f1 with the path that second optical convering unit, 2 outputs are connected to this node first share protect unit 3, itself and active channel output c1 are connected in this first share protect unit 3, with its output 13 as the right-hand member line work path of this node, and close ripple with the output 14 of right-hand member route protection path and enter and close ripple transmission ray road 10 and transmit to Node B, Node B is input 11 of left end line work path and left end route protection path input 12 with its partial wave, and respectively they are linked into the first input optical signal monitoring means 5 and the second input optical signal monitoring means 6, line work path input 11 wherein is connected to the active channel input a1 of the first share protect unit 3 of Node B after monitoring, this first share protect unit 3 is communicated to path received signal output e1 with it, and is connected to the input of Node B first optical convering unit 1;
Node B sends signal input part f2 with the path that first optical convering unit, 1 output is connected to this node second share protect unit 4, itself and active channel output c2 are connected in this second share protect unit 4, with its output 13 as the left end line work path of this node, and close ripple with the output 14 of left end route protection path and enter and close ripple transmission ray road 10 and transmit to node A, node A is input 11 of right-hand member line work path and right-hand member route protection path input 12 with its partial wave, and respectively they are linked into the 3rd input optical signal monitoring means 7 and the 4th input optical signal monitoring means 8, line work path input 11 wherein is connected to the active channel input a2 of the second share protect unit 4 of node A after monitoring, this second share protect unit 4 is communicated to path received signal output e2 with it, and is connected to the input of node A second optical convering unit 2;
Node A is connected to this node second share protect unit 4 protection path input b2 through the left end route protection path input 12 of input signal monitoring means, this second share protect unit 4 is exported it through to protection path output d2, and as right-hand member route protection path output 14, this output and right-hand member line work path input 13 are closed ripple and are entered and close ripple transmission ray road 10 and link to each other with the left end circuit input of Node B, it is input 11 of left end line work path and left end route protection path input 12 that Node B is closed ripple transmission ray road signal partial wave with this, wherein left end route protection path input 12 is by being connected to the protection path input b2 of the Node B second share protect unit 4 behind the second input optical signal monitoring means 6, and this second share protect unit 4 exports 14 through to protection path output d2 as right-hand member route protection path with it;
Node B is connected to the protection path input b1 of this node first share protect unit 3 through the right-hand member route protection path input 12 of input signal monitoring means; this first share protect unit 3 is exported it through to protection path output d1; and as left end route protection path output 14; this output and left end line work path input 13 are closed ripple and are entered and close ripple transmission ray road 10 and link to each other with the right-hand member circuit input of node A; it is input 11 of right-hand member line work path and right-hand member route protection path input 12 that node A closes ripple transmission ray road signal partial wave with this; wherein right-hand member route protection path input 12 is by being connected to the protection path input b1 of the node A first share protect unit 3 behind the 4th input optical signal monitoring means 8, and this first share protect unit 3 exports 14 through to protection path output d1 as left end route protection path with it.
This shows that in working order down the protection path does not terminate through the straight-through transmission of each node.
By above-mentioned APS and recovery routine as can be seen; internodal work relies on the on off operating mode of signal to coordinate fully; need not protect as APS and need to carry out encoding and decoding and signal analysis as the turning protocol; have simple and reliable; be not subjected to the restriction of loop node quantity; and protection is switched with the time of recovering also irrelevant with the length and the number of nodes of loop, and extensibility is extremely strong.
Claims (5)
1. the light path share protect method in the DWDM optical transmission system; it is characterized in that the needs in transmission system provide on two optical convering units of protection node; constitute protective device by two identical share protect unit and four identical input optical signal monitoring means of structure of structure; the input of wherein two input optical signal monitoring means is connected with protection path output with the active channel output of corresponding sending node respectively; the output of the input optical signal monitoring means that it is connected with the active channel output is connected with the active channel input of a share protect unit; the input of an optical convering unit on the path received signal output of this share protect unit and the node is connected; the output of this optical convering unit is connected with the path transmission signal input part of another share protect unit; and the protection path input of this another share protect unit is connected with the output of the input optical signal monitoring means of the protection path output that is connected to sending node; and the input of another optical convering unit on the path received signal output of this another share protect unit and the node is connected; the output of this another optical convering unit is connected with the path transmission signal input part of the share protect unit of the output of the input optical signal monitoring means of the active channel output that is connected to sending node; when optical transmission line interrupts; the input optical signal monitoring means of receiving node monitoring path input signal can not receive the light signal of sending node; at this moment; to be connected from being connected with protection path input to switch to the protection path output that monitors the share protect unit that input optical signal monitoring means that input service path light loses is connected with path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of another share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; and send periodic hit information from the active channel output of this share protect unit and excite sending node to send input service path light to lose alarm; at this moment; the protection path output of the share protect unit that sending node is connected with the input optical signal monitoring means that monitors hit information is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of another share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; after breakpoint is repaired; the input optical signal monitoring means of receiving node monitors the light signal of sending node; treat that signal stabilization keeps; after determining normally; all share protect unit of receiving node are recovered ortho states; and send guard signal to sending node and lose hit information, make the share protect device of sending node recover ortho states.
2. the light path share protect method in a kind of DWDM optical transmission system as claimed in claim 1; it is characterized in that described two optical convering units are first optical convering unit of left end and second optical convering unit of right-hand member; described two share protect unit are the first share protect unit and the second share protect unit; described four input optical signal monitoring means are the first input optical signal monitoring means; the second input optical signal monitoring means; the 3rd input optical signal monitoring means and the 4th input optical signal monitoring means; the input of the described first input optical signal monitoring means is connected with the active channel output of left end node; the output of the described first input optical signal monitoring means is connected with the active channel input of the described first share protect unit; the input of the described second input optical signal monitoring means is connected with the protection path output of left end node; the output of the described second input optical signal monitoring means is connected with the protection path input of the described second share protect unit; the input of described the 3rd input optical signal monitoring means is connected with the active channel output of right-hand member node; the output of described the 3rd input optical signal monitoring means is connected with the active channel input of the described second share protect unit; the input of described the 4th input optical signal monitoring means is connected with the protection path output of right-hand member node; the output of described the 4th input optical signal monitoring means is connected with the protection path input of the described first share protect unit; the input of first optical convering unit on the path received signal output of the first share protect unit and the described node is connected; the output of described first optical convering unit sends signal input part with the path of the described second share protect unit and is connected; the input of second optical convering unit on the path received signal output of the second share protect unit and the described node is connected; the output of described second optical convering unit sends signal input part with the path of the described first share protect unit and is connected; described sending node is the left end node; the described first input optical signal monitoring means monitors after input service path light loses; the protection path output of the first share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of the second share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; and send periodic hit information from the active channel output of the second share protect unit and excite the left end node to send input service path light to lose alarm; at this moment; the protection path output of the second share protect unit of left end node is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of the first share protect unit of left end node is connected from being connected with protection path input to switch to path transmission signal input part; after breakpoint is repaired; the first input optical signal monitoring means of receiving node monitors the light signal of sending node; treat that signal stabilization keeps; after determining normally; the share protect unit that this node is all recovers ortho states; and end node sends guard signal and loses hit information left, makes the share protect device of left end node recover ortho states.
3. the light path share protect method in a kind of DWDM optical transmission system as claimed in claim 1; it is characterized in that described two optical convering units are first optical convering unit of left end and second optical convering unit of right-hand member; described two share protect unit are the first share protect unit and the second share protect unit; described four input optical signal monitoring means are the first input optical signal monitoring means; the second input optical signal monitoring means; the 3rd input optical signal monitoring means and the 4th input optical signal monitoring means; the input of the described first input optical signal monitoring means is connected with the active channel output of left end node; the output of the described first input optical signal monitoring means is connected with the active channel input of the described first share protect unit; the input of the described second input optical signal monitoring means is connected with the protection path output of left end node; the output of the described second input optical signal monitoring means is connected with the protection path input of the described second share protect unit; the input of described the 3rd input optical signal monitoring means is connected with the active channel output of right-hand member node; the output of described the 3rd input optical signal monitoring means is connected with the active channel input of the described second share protect unit; the input of described the 4th input optical signal monitoring means is connected with the protection path output of right-hand member node; the output of described the 4th input optical signal monitoring means is connected with the protection path input of the described first share protect unit; the input of first optical convering unit on the path received signal output of the first share protect unit and the described node is connected; the output of described first optical convering unit sends signal input part with the path of the described second share protect unit and is connected; the input of second optical convering unit on the path received signal output of the second share protect unit and the described node is connected; the output of described second optical convering unit sends signal input part with the path of the described first share protect unit and is connected; described sending node is the right-hand member node; described the 3rd input optical signal monitoring means monitors after input service path light loses; the protection path output of the second share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of the first share protect unit is connected from being connected with protection path input to switch to path transmission signal input part; and send periodic hit information from the active channel output of the first share protect unit and excite the right-hand member node to send input service path light to lose alarm; at this moment; the protection path output of the first share protect unit of right-hand member node is connected from being connected with protection path input to switch to path transmission signal input part; path received signal output is connected from being connected with the active channel input to switch to protecting the path input; and the protection path output of the second share protect unit of right-hand member node is connected from being connected with protection path input to switch to path transmission signal input part; after breakpoint is repaired; the 3rd input optical signal monitoring means of receiving node monitors the light signal of sending node; treat that signal stabilization keeps; after determining normally; the share protect unit that this node is all recovers ortho states; and end node sends guard signal and loses hit information to the right, makes the share protect device of right-hand member node recover ortho states.
4. as the light path share protect method in claim 1 or the 2 or 3 described a kind of DWDM optical transmission systems; it is characterized in that described share protect unit is by 2 * 2 optical switches; 1 * 2 optical switch; each composition of 1 * 1 optical switch and optical coupler; the active channel input of described 2 * 2 optical switches is connected with the output of the input optical signal monitoring means of monitoring path input signal; the protection path input of described 2 * 2 optical switches is connected with the output of the input optical signal monitoring means of monitoring and protecting path input signal; the input of an optical convering unit in the path received signal output of described 2 * 2 optical switches and described two optical convering units is connected; the protection path output of described 2 * 2 optical switches is connected with a swing arm of described 1 * 2 optical switch; the output that the path of described optical coupler sends another optical convering unit in signal input part and described two optical convering units is connected; an output of described optical coupler is connected with another swing arm of described 1 * 2 optical switch; another output of described optical coupler is connected with the input of described 1 * 1 optical switch; the output of described 1 * 1 optical switch is connected with the active channel output, and the arm of deciding of described 1 * 2 optical switch is connected with protection path output.
5. the light path share protect method in a kind of DWDM optical transmission system as claimed in claim 4 is characterized in that described periodic hit information is produced by described 1 * 1 optical switch, and the hit duration is greater than 2ms, and less than cycle duration.
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