Networking architecture and metro optical transmission network system

Abstract

The invention discloses a networking architecture and a metro optical transmission network system, and belongs to the technical field of transport networks. The networking architecture comprises a first wavelength selection switch, a second wavelength selection switch and a plurality of access rings. The first wavelength selection switch is used for converging service signals, and the second wavelength selection switch is used for distributing the service signals; each access ring is connected between the input end of the first wavelength selection switch and the output end of the second wavelength selection switch, and the output end of the first wavelength selection switch is connected with each access ring through a target wavelength selection switch. According to the invention, the time delay of inter-ring service signal scheduling can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of optical transmission networks, and in particular to a networking architecture and a metropolitan area optical transmission network system. Background Art

[0002] Optical transport networks (OTN), such as metropolitan (or local) optical transport networks, can be networked using pooled wavelength division technology. For example, multiple aggregation sites are arranged in the metropolitan area, each aggregation site is equipped with a wavelength selective switch (WSS), multiple access rings are connected between two wavelength selective switches at different physical locations, and multiple central offices (COs) are arranged along each access ring. Users access the network by accessing a nearby central office.

[0003] The wavelength selective switch in the aggregation site is similar to a resource pool, which is used to aggregate or distribute service signals of different wavelengths. In the optical transport network, it plays a connecting role, connecting to the core layer of the optical transport network upward and connecting to multiple access rings downward. For example, of the two wavelength selective switches connected to the access ring, one is used to aggregate the service signals sent by the central office on each access ring, and the other is used to distribute the service signals to the central office on each access ring.

[0004] However, the current networking architecture has a relatively large delay in scheduling service signals between central office rooms on different access rings. Summary of the invention

[0005] The present application provides a networking architecture and a metropolitan optical transmission network system, which can solve the problem of large inter-ring scheduling delay in related technologies. The technical solution is as follows:

[0006] In one aspect, a networking architecture is provided, the networking architecture comprising a first wavelength selective switch, a second wavelength selective switch, and a plurality of access rings;

[0007] The first wavelength selective switch is used to aggregate service signals, and the second wavelength selective switch is used to distribute service signals;

[0008] Each access ring is connected between the output end of the second wavelength selective switch and the input end of the first wavelength selective switch, and the output end of the first wavelength selective switch and each access ring are connected through a target wavelength selective switch.

[0009] The target wavelength selective switch is located at the aggregation site where the first wavelength selective switch is located, or the aggregation site where the second wavelength selective switch is located, or both the aggregation site where the first wavelength selective switch is located and the aggregation site where the second wavelength selective switch is located have the target wavelength selective switch.

[0010] The target wavelength selection switch is used to distribute service signals.

[0011] In the solution shown in the present application, an output end of the first wavelength selection switch is connected to each access ring through a target wavelength selection switch. Then, the service signal converged to the first wavelength selection switch can also be transmitted to each access ring through the target wavelength selection switch in the convergence layer to realize all-optical scheduling. Therefore, during scheduling, it is not necessary to transmit through the core layer, and it is not necessary to convert optical signals to electrical signals, and it is not necessary to convert electrical signals to optical signals. Therefore, the delay of inter-ring scheduling can be reduced.

[0012] In a possible implementation, the second wavelength selective switch is a blocking wavelength selective switch;

[0013] The target wavelength selective switch is a third wavelength selective switch different from the second wavelength selective switch, and the third wavelength selective switch is used to distribute service signals;

[0014] The input end of the third wavelength selective switch is connected to the output end of the first wavelength selective switch, and multiple output ends of the third wavelength selective switch are connected one by one to each access ring.

[0015] Among them, there is a blocking wavelength selective switch, that is, a wavelength selective switch that cannot process multiple optical signals of the same wavelength at the same time, for example, cannot process two or more optical signals with a wavelength of λ1 at the same time.

[0016] The input end of the third wavelength selective switch is connected to the output end of the first wavelength selective switch via an optical fiber, and the output end of the third wavelength selective switch is connected to the access ring via an optical fiber.

[0017] In the solution shown in this application, if a service signal on an access ring needs to be scheduled between rings, it does not need to be transmitted to the core layer through the first wavelength selection switch, transmitted to the second wavelength selection switch through the core layer, and then scheduled to another access ring. Instead, it is scheduled to another access ring through the third wavelength selection switch at the convergence layer. There is no photoelectric conversion and electro-optical conversion in this process. It is a full optical inter-ring scheduling, which can reduce latency.

[0018] In a possible implementation manner, the third wavelength selective switch is located at a convergence site where the second wavelength selective switch is located.

[0019] In the solution shown in this application, the third wavelength selection switch is located in the aggregation site where the second wavelength selection switch is located. Then, the output end of the third wavelength selection switch and the optical fiber between the access ring are arranged in the aggregation site, which belongs to indoor fiber jumper. Then, in network construction, only a relatively long outdoor optical fiber needs to be pulled between the first wavelength selection switch and the third wavelength selection switch, which can reduce the amount of network construction engineering.

[0020] In a possible implementation, the networking architecture further includes a fourth wavelength selective switch and a fifth wavelength selective switch, the fourth wavelength selective switch and the first wavelength selective switch are backed up for each other, and the fifth wavelength selective switch and the second wavelength selective switch are backed up for each other;

[0021] The first wavelength selective switch and the fifth wavelength selective switch are located at a first convergence site, and the second wavelength selective switch and the fourth wavelength selective switch are located at a second convergence site;

[0022] The multiple access rings form a multiple access ring pairs, each access ring pair includes two access rings, one access ring in each access ring pair is connected between the input end of the first wavelength selective switch and the output end of the second wavelength selective switch, and the other access ring in each access ring pair is connected between the input end of the fourth wavelength selective switch and the output end of the fifth wavelength selective switch;

[0023] The third wavelength selective switch is located at the first convergence site, and the input end of the third wavelength selective switch is connected to the output end of the first wavelength selective switch through an optical fiber, and multiple output ends of the third wavelength selective switch and multiple access rings connected to the fifth wavelength selective switch are connected one by one through multiple optical fibers, and / or,

[0024] The third wavelength selective switch is located at the second convergence site, and the input end of the third wavelength selective switch is connected to the output end of the fourth wavelength selective switch through an optical fiber, and multiple output ends of the third wavelength selective switch are connected one by one to multiple access rings connected to the second wavelength selective switch through multiple optical fibers.

[0025] The first wavelength selective switch and the fourth wavelength selective switch are both wavelength selective switches responsible for aggregating service signals, and the second wavelength selective switch and the fifth wavelength selective switch are both wavelength selective switches responsible for distributing service signals.

[0026] Optionally, the third wavelength selective switch is arranged in the first aggregation site, or the third wavelength selective switch is arranged in the second aggregation site, or the third wavelength selective switch is arranged in both the first aggregation site and the second aggregation site.

[0027] In the solution shown in the present application, since the aggregation site where the third wavelength selective switch is located includes both a wavelength selective switch responsible for aggregation and a wavelength selective switch responsible for distribution, the input end of the third wavelength selective switch and the output end of the wavelength selective switch responsible for aggregation in the aggregation site can be connected via an optical fiber, and the output end of the third wavelength selective switch and each access ring connected to the wavelength selective switch responsible for distribution in the aggregation site can be connected one by one via multiple optical fibers.

[0028] It can be seen that the third wavelength selective switch and the wavelength selective switch connected to it are located in the same aggregation site, so the optical fiber connecting the third wavelength selective switch and the wavelength selective switch connected to it is a jumper located indoors, and the optical fiber connecting the third wavelength selective switch and the access ring is also a jumper located indoors. Therefore, in network construction, there is no need to pull a relatively long outdoor optical fiber between the two aggregation sites connected by the access ring, which can further reduce the amount of network construction engineering.

[0029] In a possible implementation, the optical fiber connected to the input end of the third wavelength selective switch is connected to the output optical path of the first wavelength selective switch through a coupler, or,

[0030] The optical fiber used to connect to the input end of the third wavelength selective switch is connected to the output port of the first wavelength selective switch.

[0031] In a possible implementation, an optical fiber used to connect the output end of the third wavelength selective switch and each access ring has one end connected to the access ring through a coupler and the other end in the output port of the third wavelength selective switch.

[0032] In a possible implementation, the second wavelength selective switch is a non-blocking wavelength selective switch;

[0033] The target wavelength selective switch is the second wavelength selective switch, and an output end of the first wavelength selective switch is connected to an input end of the second wavelength selective switch.

[0034] The non-blocking wavelength selective switch can process multiple optical signals with the same wavelength at the same time, for example, it can process two or more optical signals with the wavelength λ1 at the same time.

[0035] The solution shown in this application adopts this networking architecture. If a service signal on an access ring needs to be scheduled between rings, it does not need to be transmitted to the core layer through the first wavelength selection switch, transmitted to the second wavelength selection switch through the core layer, and then scheduled to another access ring. Instead, it is scheduled to another access ring at the convergence layer through the second wavelength selection switch responsible for distribution. There is no photoelectric conversion and electro-optical conversion in this process, but it is a full optical ring scheduling, so it can reduce latency.

[0036] Moreover, the solution shown in the present application does not require the addition of a wavelength selection switch, and can reduce the number of installation slots for wavelength selection in the aggregation site (wherein the wavelength selection switch is usually installed in a slot of a rack in the aggregation site).

[0037] In a possible implementation manner, the networking architecture further includes a fourth wavelength selective switch and a fifth wavelength selective switch, the fourth wavelength selective switch and the first wavelength selective switch are backed up for each other, and the fifth wavelength selective switch and the second wavelength selective switch are backed up for each other;

[0038] The first wavelength selective switch and the fifth wavelength selective switch are located at a first convergence site, and the second wavelength selective switch and the fourth wavelength selective switch are located at a second convergence site;

[0039] The multiple access rings form a multiple access ring pairs, each access ring pair includes two access rings, one access ring in each access ring pair is connected between the input end of the first wavelength selective switch and the output end of the second wavelength selective switch, and the other access ring in each access ring pair is connected between the input end of the fourth wavelength selective switch and the fifth wavelength selective switch;

[0040] The target wavelength selective switch includes the second wavelength selective switch, an output end of the fourth wavelength selective switch and an input end of the second wavelength selective switch are connected via an optical fiber, and / or,

[0041] The target wavelength selective switch includes the fifth wavelength selective switch, and an output end of the first wavelength selective switch and an input end of the fifth wavelength selective switch are connected via an optical fiber.

[0042] In the solution shown in this application, the wavelength selection switch responsible for distribution is used as the target wavelength selection switch. Then, one input end of the wavelength selection switch responsible for distribution only needs to be connected to one output end of the wavelength selection switch responsible for aggregation in the aggregation site, so that full inter-optical ring scheduling can be achieved. It can be seen that by adopting this solution, there is no need to add a new wavelength selection switch, nor is there a need to pull a relatively long optical fiber between the first aggregation site and the second aggregation site, further reducing the amount of networking engineering.

[0043] In a possible implementation, the first wavelength selective switch is connected one by one to the plurality of access rings and the signal receivers in the aggregation site respectively;

[0044] The second wavelength selective switch is connected one by one to a plurality of access rings and signal transmitters in the aggregation site where the second wavelength selective switch is located.

[0045] In the solution shown in the present application, the first wavelength selective switch is connected to the signal receiver in the aggregation site through an optical fiber, so the service signal aggregated by the first wavelength selective switch can be transmitted to the local signal receiver. The second wavelength selective switch is connected to the signal transmitter in the aggregation site through an optical fiber, so the service signal transmitted by the local signal transmitter can be transmitted to the second wavelength selective switch.

[0046] In a possible implementation manner, the first wavelength selective switch is further connected to the core layer device via an optical fiber, and the second wavelength selective switch is further connected to the core layer device via an optical fiber.

[0047] In the solution shown in the present application, the first wavelength selective switch is connected to the core layer device through an optical fiber, so the service signal gathered by the first wavelength selective switch can be transmitted to the core layer device. The second wavelength selective switch is connected to the core layer device through an optical fiber, so the second wavelength selective switch can receive the service signal sent by the core layer device.

[0048] In a possible implementation, the first wavelength selective switch includes a first inner wavelength selective switch and a first outer wavelength selective switch;

[0049] The first pair of internal wavelength selective switches are respectively connected to a plurality of access rings, signal receivers in the aggregation site, and the first external wavelength selective switch one by one, and the first external wavelength selective switch is connected to the core layer device.

[0050] In the solution shown in the present application, when the ports of the first wavelength selective switch are insufficient, for example, when the input ports are insufficient, the first wavelength selective switch includes two wavelength selective switches, of which one is recorded as a first inner wavelength selective switch and the other is recorded as a first outer wavelength selective switch, but the inner and outer are only used to distinguish two different wavelength selective switches and do not constitute a specific limitation.

[0051] In the solution shown in the present application, the first wavelength selective switch is connected to multiple access rings, signal receivers in the aggregation site, and core layer equipment through a first pair of inner wavelength selective switches and a first outer wavelength selective switch.

[0052] In a possible implementation, the second wavelength selective switch includes a second inner wavelength selective switch and a second outer wavelength selective switch;

[0053] The second pair of inner wavelength selective switches are respectively connected one by one with a plurality of access rings, signal transmitters in the aggregation site where they are located, and the second outer wavelength selective switch, and the second outer wavelength selective switch is connected with the core layer device.

[0054] In the solution shown in the present application, when the ports of the second wavelength selective switch are insufficient, for example, when the input ports are insufficient, the second wavelength selective switch includes two wavelength selective switches, of which one is recorded as a second inner wavelength selective switch and the other is recorded as a second outer wavelength selective switch, but the inner and outer are only used to distinguish two different wavelength selective switches and do not constitute a specific limitation.

[0055] In the solution shown in the present application, the second wavelength selective switch is connected to multiple access rings, signal receivers in the aggregation site, and core layer equipment through a second pair of inner wavelength selective switches and a second outer wavelength selective switch.

[0056] On the other hand, a metropolitan optical transmission network system is provided, which includes a core layer, a convergence layer and an access layer, and the networking architecture between the convergence layer and the access layer is the networking architecture described above.

[0057] In the solution shown in the present application, an output end of the first wavelength selection switch is connected to each access ring through a target wavelength selection switch. Then, the service signal converged to the first wavelength selection switch can also be transmitted to each access ring through the target wavelength selection switch in the convergence layer to realize all-optical scheduling. Therefore, during scheduling, it is not necessary to transmit through the core layer, and it is not necessary to convert optical signals to electrical signals, and it is not necessary to convert electrical signals to optical signals. Therefore, the delay of inter-ring scheduling can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 This is a schematic diagram of a network architecture in a related solution provided by this application;

[0059] Figure 2 It is a schematic diagram of a networking architecture provided by this application;

[0060] Figure 3 It is a schematic diagram of a networking architecture provided by this application;

[0061] Figure 4 It is a schematic diagram of a networking architecture provided by this application;

[0062] Figure 5It is a schematic diagram of a networking architecture provided by this application;

[0063] Figure 6 It is a schematic diagram of a networking architecture provided by this application;

[0064] Figure 7 It is a schematic diagram of a networking architecture provided by this application;

[0065] Figure 8 It is a schematic diagram of a networking architecture provided by this application;

[0066] Fig. 9 It is a schematic diagram of a networking architecture provided by this application;

[0067] Fig.10 It is a schematic diagram of a networking architecture provided by this application;

[0068] Fig.11 It is a schematic diagram of a networking architecture provided by this application;

[0069] Fig.12 It is a schematic diagram of a networking architecture provided by this application;

[0070] Fig.13 It is a schematic diagram of a networking architecture provided by this application.

[0071] Description of Reference Numerals

[0072] 1. First wavelength selective switch; 11. First inner wavelength selective switch; 12. First outer wavelength selective switch.

[0073] 2. Second wavelength selective switch; 21. Second inner wavelength selective switch; 22. Second outer wavelength selective switch.

[0074] 3. The third wavelength selection switch.

[0075] 4. Fourth wavelength selective switch; 41. Fourth inner wavelength selective switch; 42. Fourth outer wavelength selective switch.

[0076] 5. Fifth wavelength selective switch; 51. Fifth inner wavelength selective switch; 52. Fifth outer wavelength selective switch.

[0077] 6. Access ring; 7. First optical fiber; 8. Second optical fiber; 9. Third optical fiber. DETAILED DESCRIPTION

[0078] Although the description of this application will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to the implementation method. On the contrary, the purpose of introducing the application in conjunction with the implementation method is to cover other options or modifications that may be extended based on the claims of this application. In order to provide a deep understanding of this application, many specific details will be included in the following description. This application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of this application, some specific details will be omitted in the description. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict.

[0079] In the embodiments of the present application, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features.

[0080] In the embodiments of the present application, "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0081] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0082] This embodiment relates to an optical transport network, and in particular to a networking architecture of a metropolitan area optical transport network, wherein the metropolitan area optical transport network is also called a local optical transport network.

[0083] Most of the current networking architectures use pooled wavelength division technology. Pooled wavelength division technology is a network technology based on fiber-optic communication. It uses wavelength division multiplexing technology to transmit multiple optical signals through different wavelengths, thereby achieving high-speed, high-bandwidth data transmission.

[0084] For example, multiple aggregation sites are arranged in a metropolitan area. The aggregation site is the aggregation site room. A wavelength selective switch (WSS) is arranged in the aggregation site. Multiple access rings are connected between two wavelength selective switches in different aggregation sites. Multiple central offices (CO) are arranged along each access ring. Users can access the network by accessing a nearby central office room. The access ring is also an optical fiber. The wavelength selective switch in the aggregation site is similar to a resource pool, which is used to aggregate or distribute service signals of different wavelengths. Therefore, it is called pooled wavelength division.

[0085] However, the current networking architecture has a relatively large delay in scheduling service signals between central office rooms on different access rings. The scheduling of service signals between central office rooms on different access rings is also called inter-ring scheduling.

[0086] For example, Figure 1 As shown, Figure 1 A schematic diagram of a networking architecture in the current prior art is shown. Figure 1 As shown, the first aggregation site is equipped with a first wavelength selection switch 1, which is responsible for aggregating service signals, and the second aggregation site is equipped with a second wavelength selection switch 2, which is responsible for distributing service signals. Multiple access rings are connected between the two wavelength selection switches, and each access ring is equipped with many local terminal rooms (one of which is shown in the figure). Figure 1 In the networking architecture shown, the delay of service signals in inter-ring scheduling is relatively large.

[0087] This is because a local machine room (called local machine room 11) on a certain access ring (referred to as access ring 1#) needs to send service signals to a local machine room (referred to as local machine room 21) on another access ring (referred to as access ring 2#). Figure 1 As shown, the service signal of the 11th local office room needs to be first converged to the first wavelength selection switch, and then transmitted to the core layer of the metropolitan optical transport network through the first wavelength selection switch. In the core layer, the received optical signal is usually converted into an electrical signal, and the electrical signal is parsed to obtain the destination of the electrical signal. Then, the electrical signal is converted into an optical signal, and the converted optical signal is transmitted to the second wavelength selection switch, and then distributed to the 2# access ring through the second wavelength selection switch, and then transferred to the 21st local office room through the 2# access ring. It can be seen that during the scheduling of the service signal between the rings, it will undergo the processing process of converting the optical signal into the electrical signal, and the electrical signal into the optical signal, so the delay is relatively large.

[0088] In order to reduce the scheduling delay of inter-ring service signals, this embodiment provides a networking architecture in which the service signals on each access ring can be transmitted again to each access ring in the aggregation layer of the metropolitan optical transmission network after being converged to the wavelength selection switch, without passing through the core layer of the metropolitan optical transmission network. Therefore, the service signal does not need to be converted into an electrical signal during the inter-ring scheduling, and can be transmitted as an optical signal all the time. Therefore, the inter-ring scheduling delay can be reduced.

[0089] refer to Figure 2 As shown, Figure 2 A schematic diagram of a networking architecture provided by an embodiment of the present application is shown. Figure 2 As shown, the network architecture includes a first wavelength selection switch 1 and a second wavelength selection switch 2, and a plurality of access rings 6 are connected between the first wavelength selection switch 1 and the second wavelength selection switch 2 (for simplicity, the attached Figure 2 Only two access rings are used as an example for explanation). The optical signal transmitted in each access ring 6 has directionality, so one end of each access ring 6 is connected to the input end of the first wavelength selection switch 1, and the other end is connected to the output end of the second wavelength selection switch 2, wherein: Figure 2 The middle arrow indicates the transmission direction of the optical signal in the access ring 6 .

[0090] The first wavelength selective switch 1 is located in a first aggregation site, the second wavelength selective switch 2 is located in a second aggregation site, and the first aggregation site and the second aggregation site are located in different physical locations.

[0091] The first wavelength selective switch 1 is used to aggregate service signals, that is, to aggregate service signals on each access ring 6 , and the second wavelength selective switch 2 is used to distribute service signals, that is, to distribute service signals to each access ring 6 .

[0092] In order to realize the above-mentioned service signal converged to the first wavelength selection switch 1, it can also enter each access ring 6 in the convergence layer. Figure 2 As shown, the output end of the first wavelength selection switch 1 is connected to each access ring 6 through a target wavelength selection switch ( Figure 2 The third wavelength selective switch 3 is the target wavelength selective switch), wherein the target wavelength selective switch is located in the first aggregation site or the second aggregation site.

[0093] For example, refer to Figure 2 As shown, an output end of the first wavelength selective switch 1 is connected to an input end of the target wavelength selective switch through an optical fiber, and multiple output ends of the target wavelength selective switch are connected to each access ring one by one through optical fibers.

[0094] In this way, the service signal converged to the first wavelength selection switch 1 can also be transmitted to each access ring 6 through the target wavelength selection switch in the convergence layer for full optical inter-ring scheduling. It does not need to be transmitted through the core layer, nor does it need to undergo conversion from optical signals to electrical signals, and from electrical signals to optical signals, thereby reducing the delay of inter-ring scheduling.

[0095] Optionally, the target wavelength selective switch is a wavelength selective switch newly added in the first aggregation site or the second aggregation site, or the target wavelength selective switch is a wavelength selective switch already arranged in the first aggregation site or the second aggregation site.

[0096] For example, if the wavelength selective switch in the aggregation site is a blocking wavelength selective switch, then the target wavelength selective switch is a wavelength selective switch newly added in the aggregation site.

[0097] Among them, there is a blocking wavelength selective switch, that is, a wavelength selective switch that cannot process multiple optical signals of the same wavelength at the same time, for example, a wavelength selective switch that cannot process two or more optical signals with a wavelength of λ1 at the same time.

[0098] For a blocking wavelength selective switch, it has multiple input ports, but all the input ports receive the full-wavelength optical signal together. For example, the full-wavelength optical signal is a 96-wavelength optical signal, so all the input ports receive the 96-wavelength optical signal together.

[0099] Among them, the opposite of a blocking wavelength selective switch is a non-blocking wavelength selective switch, which is a wavelength selective switch that can process multiple optical signals of the same wavelength at the same time. Figure 4 The non-blocking wavelength selective switch will be explained in detail when the networking architecture is shown.

[0100] As an example, the second wavelength selective switch 2 is a blocking wavelength selective switch, then the target wavelength selective switch is a third wavelength selective switch 3 which is different from the first wavelength selective switch 1 and the second wavelength selective switch 2, see Figure 2 As shown, the third wavelength selective switch 3 is used to distribute service signals. The input end of the third wavelength selective switch 3 is connected to the output end of the first wavelength selective switch 1 through an optical fiber (for ease of introduction, recorded as the first optical fiber 7), and multiple output ends of the third wavelength selective switch 3 are connected to each access ring 6 through multiple optical fibers (for ease of introduction, recorded as the second optical fiber 8).

[0101] In this way, Figure 2As shown, when inter-ring scheduling is performed, for example, the service signal of the central office room of the 1# access ring needs to be scheduled to the central office room of the 2# access ring. Then, after the optical signal corresponding to the service signal is converged to the first wavelength selection switch 1, it only needs to be scheduled to the output end connected to the third wavelength selection switch 3. The optical signal corresponding to the service signal can be transmitted to the third wavelength selection switch 3 along the first optical fiber 7, and the third wavelength selection switch 3 is then distributed to the central office room of the 2# access ring.

[0102] It can be seen that taking Figure 2 In the networking architecture shown, if a service signal on an access ring needs to be scheduled between rings, it does not need to be transmitted to the core layer through the first wavelength selection switch 1, transmitted to the second wavelength selection switch 2 through the core layer, and then scheduled to another access ring. Instead, it is scheduled to another access ring through the third wavelength selection switch 3 at the convergence layer. There is no photoelectric conversion and electro-optical conversion in this process, which can reduce latency.

[0103] Regarding the connection between the third wavelength selective switch 3 and the first wavelength selective switch 1 , the input end of the third wavelength selective switch 3 is connected to one output end of the first wavelength selective switch 1 via the first optical fiber 7 .

[0104] For example, one end of the first optical fiber 7 is directly connected to the input port of the third wavelength selective switch 3 , and the other end of the first optical fiber 7 is directly connected to the output port of the first wavelength selective switch 1 .

[0105] For another example, one end of the first optical fiber 7 is directly connected to the input port of the third wavelength selective switch 3, and the other end of the first optical fiber 7 is connected to the output optical path of the first wavelength selective switch 1 through a coupler. Figure 2 As shown, the end of the first optical fiber 7 is connected to the optical path between the first wavelength selective switch 1 and the first signal receiver through a coupler.

[0106] Regarding the connection mode between the third wavelength selective switch 3 and each access ring 6. Multiple output ends of the third wavelength selective switch 3 and each access ring 6 are connected one by one through multiple second optical fibers 8, wherein each second optical fiber 8 is connected between one output end of the third wavelength selective switch 3 and one access ring 6.

[0107] For example, one end of the second optical fiber 8 is directly connected to the output port of the third wavelength selective switch 3, and the other end of the second optical fiber 8 is connected to the access ring 6 through a coupler.

[0108] In one example, considering that the third wavelength selection switch 3 is used to distribute the service signal to the central office of each access ring 6, the access ring 6 is a single fiber, and the optical signal is directional when transmitted on the access ring 6. Figure 2The middle arrow indicates the transmission direction of the optical signal. Therefore, the connection position between the second optical fiber 8 and the access ring 6 is located in the second aggregation site where the second wavelength selection switch 2 is located, so that the third wavelength selection switch 3 can dispatch the service signal to any local machine room on each access ring 6.

[0109] In an example, the third wavelength selective switch 3 is located in a first aggregation site where the first wavelength selective switch 1 is located, or the third wavelength selective switch 3 is located in a second aggregation site where the second wavelength selective switch 2 is located.

[0110] As described above, the connection position between the second optical fiber 8 and the access ring 6 is located in the second convergence site where the second wavelength selective switch 2 is located, so, optionally, the third wavelength selective switch 3 is arranged in the second convergence site where the second wavelength selective switch 2 is located. In this way, in network construction, it is only necessary to pull a relatively long optical fiber between the third wavelength selective switch 3 and the first wavelength selective switch 1, and connect multiple jump fibers (i.e., optical fibers located indoors) between multiple output ends of the third wavelength selective switch 3 and multiple access rings 6. In this way, the amount of network construction can be reduced.

[0111] Of course, the third wavelength selective switch 3 can also be arranged in the first convergence site where the first wavelength selective switch 1 is located. In this way, since the third wavelength selective switch 3 and the first wavelength selective switch 1 are both in the first convergence site, in network construction, it is sufficient to connect a jumper fiber between the third wavelength selective switch 3 and the first wavelength selective switch 1. Since the connection position of the second optical fiber 8 and the access ring 6 is located in the second convergence site, in network construction, it is necessary to pull a plurality of second optical fibers 8 between the first convergence site and the second convergence site.

[0112] like Figure 2 The figure shows a schematic diagram of a network architecture without backup. Usually, in order to ensure good communication quality, backup networking is performed, for example, 1+1 backup networking.

[0113] like Figure 3 As shown, it is a schematic diagram of a network architecture with backup. Figure 3 Not only includes Figure 2 The first wavelength selective switch 1 and the second wavelength selective switch 2 in the embodiment also include a fourth wavelength selective switch 4 and a fifth wavelength selective switch 5. The fourth wavelength selective switch 4 is used to aggregate service signals and serves as a backup for the first wavelength selective switch 1, and the fifth wavelength selective switch 5 is used to distribute service signals and serves as a backup for the second wavelength selective switch 2.

[0114] Continue to refer Figure 3As shown, the first wavelength selective switch 1 and the fifth wavelength selective switch 5 are arranged in the first aggregation site, and the second wavelength selective switch 2 and the fourth wavelength selective switch 4 are arranged in the second aggregation site.

[0115] because Figure 3 The wavelength selection switch in the networking architecture shown in FIG. 1 has backup, so the number of access rings 6 is presented in pairs. Then, if Figure 3 As shown, the plurality of access rings 6 form a plurality of access ring pairs 60, each access ring pair 60 includes two access rings 6. Figure 3 Only two access ring pairs 60 are used as an example for description. For example, Figure 3 The number of 1# access rings is two, forming an access ring pair 60 , and the number of 2# access rings is two, forming another access ring pair 60 .

[0116] Continue to refer Figure 3 As shown, one access ring 6 in each access ring pair 60 is connected between the input end of the first wavelength selective switch 1 in the first aggregation site and the output end of the second wavelength selective switch 2 in the second aggregation site, and the other access ring 6 in each access ring pair 60 is connected between the input end of the fourth wavelength selective switch 4 in the first aggregation site and the output end of the fifth wavelength selective switch 5 in the second aggregation site.

[0117] For example, Figure 3 As shown, two 1# access rings form an access ring pair 60, one of the 1# access rings in the access ring pair 60 is connected between the input end of the first wavelength selective switch 1 and the output end of the second wavelength selective switch 2, and the other 1# access ring in the access ring pair 60 is connected between the input end of the fourth wavelength selective switch 4 and the output end of the fifth wavelength selective switch 5.

[0118] Optionally, the third wavelength selective switch 3 is arranged at the first aggregation site, or the third wavelength selective switch 3 is arranged at the second aggregation site, or Figure 3 As shown, the third wavelength selective switch 3 is arranged in both the first aggregation site and the second aggregation site.

[0119] If the third wavelength selective switch 3 is arranged in the first convergence site, the input end of the third wavelength selective switch 3 is connected to the output end of the first wavelength selective switch 1 through the first optical fiber 7, and the output end of the third wavelength selective switch 3 is connected to multiple access rings 6 connected to the fifth wavelength selective switch 5 through multiple second optical fibers 8.

[0120] If the third wavelength selective switch 3 is arranged in the second convergence site, the input end of the third wavelength selective switch 3 is connected to the output end of the fourth wavelength selective switch 4 through the first optical fiber 7, and the output end of the third wavelength selective switch 3 is connected to the multiple access rings 6 connected to the second wavelength selective switch 2 through the multiple second optical fibers 8.

[0121] If the third wavelength selective switch 3 is arranged in both the first aggregation site and the second aggregation site, the input end of the third wavelength selective switch 3 in the first aggregation site is connected to the output end of the first wavelength selective switch 1 through the first optical fiber 7, and the output end of the third wavelength selective switch 3 in the first aggregation site is connected to the multiple access rings 6 connected to the fifth wavelength selective switch 5 one by one through the multiple second optical fibers 8. Moreover, the input end of the third wavelength selective switch 3 in the second aggregation site is connected to the output end of the fourth wavelength selective switch 4 through the first optical fiber 7, and the output end of the third wavelength selective switch 3 is connected to the multiple access rings 6 connected to the second wavelength selective switch 2 one by one through the multiple second optical fibers 8.

[0122] Depend on Figure 3 It can be seen that the third wavelength selective switch 3 and the first wavelength selective switch 1 are located in the first convergence site, so the first optical fiber 7 connecting the third wavelength selective switch 3 and the first wavelength selective switch 1 is a jumper located in the first convergence site, and the second optical fiber 8 connecting the third wavelength selective switch 3 and each access ring 6 is also a jumper located in the first convergence site. Figure 2 Compared with the networking architecture shown in the figure, there is no need to pull a relatively long optical fiber between the first aggregation site and the second aggregation site, which can further reduce the networking engineering workload.

[0123] The above is an introduction to a solution in which the target wavelength selective switch is a third wavelength selective switch 3 different from the first wavelength selective switch 1 and the second wavelength selective switch 2 when the second wavelength selective switch 2 is a blocking wavelength selective switch. The following will introduce a solution in which the target wavelength selective switch is the second wavelength selective switch 2 when the second wavelength selective switch 2 is a non-blocking wavelength selective switch.

[0124] The non-blocking wavelength selective switch is a wavelength selective switch that can simultaneously process multiple optical signals of the same wavelength, for example, it can simultaneously process two or more optical signals of wavelength λ1.

[0125] For a non-blocking wavelength selective switch, including multiple input ports and multiple output ports, a single input port can receive a full-wavelength optical signal. For example, a full-wavelength optical signal is a 96-wavelength optical signal, so a single input port can receive 96-wavelength optical signals.

[0126] refer to Figure 4As shown, a networking architecture of an embodiment of the present application is shown. Figure 4 The first wavelength selective switch 1 and the second wavelength selective switch 2 in the embodiment are both non-blocking wavelength selective switches, and Figure 2 The first wavelength selective switch 1 and the second wavelength selective switch 2 in the embodiment are both blocking wavelength selective switches.

[0127] Since the second wavelength selective switch 2 is a non-blocking wavelength selective switch and can process multiple optical signals of the same wavelength at the same time, there is no need to add a wavelength selective switch to perform inter-ring scheduling, such as Figure 4 As shown, it is only necessary to connect the output end of the first wavelength selective switch 1 and one input end of the second wavelength selective switch 2 through an optical fiber (referred to as the third optical fiber 9). Then, the target wavelength selective switch is the second wavelength selective switch 2.

[0128] For example, the second wavelength selective switch 2 has multiple input ends, and one of the input ends (referred to as the first input end) is configured as an input end for inter-ring scheduling. Then, the output end of the first wavelength selective switch 1 is connected to the first input end of the second wavelength selective switch 2 through the third optical fiber 9.

[0129] Thus, using Figure 4 In the networking architecture, when performing inter-ring scheduling, for example, the service signal of a local machine room (recorded as local machine room 11) of access ring 1# needs to be scheduled to the local machine room (recorded as local machine room 22) of access ring 2#. Then, after the optical signal corresponding to the service signal (recorded as the optical signal with wavelength λ1) is converged to the first wavelength selective switch 1, it only needs to be scheduled to the output end connected to the first input end of the second wavelength selective switch 2, and the optical signal can be transmitted along the third optical fiber 9 to the first input port of the second wavelength selective switch 2, and the second wavelength selective switch 2 then distributes the optical signal to the local machine room 21 of access ring 2#.

[0130] It should be noted that, according to the pre-configured optical path configuration, if the optical signal with the wavelength λ1 mentioned above enters the second wavelength selective switch 2 from other input ends (input ends other than the first input end) of the second wavelength selective switch 2, the second wavelength selective switch 2 will distribute it to the 11th local terminal machine room of the 1# access ring. If it enters the second wavelength selective switch 2 from the first input end of the second wavelength selective switch 2, the second wavelength selective switch 2 will distribute it to the 21st local terminal machine room of the 2# access ring.

[0131] It can be seen that taking Figure 4In the networking architecture shown, if a service signal on an access ring needs to be scheduled between rings, it does not need to be transmitted to the core layer through the first wavelength selection switch 1, and then transmitted to the second wavelength selection switch 2 through the core layer, and then scheduled to another access ring. Instead, it is scheduled to another access ring through the second wavelength selection switch 2 at the convergence layer. There is no photoelectric conversion and electro-optical conversion in this process, which can reduce the scheduling delay between rings.

[0132] Moreover, taking Figure 4 The networking architecture shown does not require additional wavelength selection switches, thus reducing the number of installation slots for wavelength selection in the aggregation site.

[0133] like Figure 4 The figure shows a network architecture without backup. Usually, in order to ensure good communication quality, backup networking is performed, for example, 1+1 backup networking.

[0134] like Figure 5 As shown, it is a schematic diagram of a network architecture with backup. Figure 5 Not only includes Figure 4 The first wavelength selective switch 1 and the second wavelength selective switch 2 in the embodiment also include a fourth wavelength selective switch 4 and a fifth wavelength selective switch 5, wherein: Figure 5 The fourth wavelength selective switch 4 and the fifth wavelength selective switch 5 in the embodiment are both non-blocking wavelength selective switches, and Figure 3 The fourth wavelength selective switch 4 and the fifth wavelength selective switch 5 are both blocking wavelength selective switches.

[0135] The fourth wavelength selective switch 4 is used to aggregate service signals and serves as a backup for the first wavelength selective switch 1 . The fifth wavelength selective switch 5 is used to distribute service signals and serves as a backup for the second wavelength selective switch 2 .

[0136] like Figure 5 As shown, the first wavelength selective switch 1 and the fifth wavelength selective switch 5 are arranged in the first aggregation site, and the second wavelength selective switch 2 and the fourth wavelength selective switch 4 are arranged in the second aggregation site.

[0137] The number of access rings 6 is presented in pairs, so if Figure 5 As shown, the plurality of access rings 6 form a plurality of access ring pairs 60, each access ring pair 60 includes two access rings 6. Figure 5 Only two access ring pairs 60 are used as an example for description. For example, Figure 5 The number of 1# access rings is two, forming an access ring pair 60 , and the number of 2# access rings is two, forming another access ring pair 60 .

[0138] Continue to refer Figure 5As shown, one access ring 6 in each access ring pair 60 is connected between the input end of the first wavelength selective switch 1 in the first aggregation site and the output end of the second wavelength selective switch 2 in the second aggregation site, and the other access ring 6 in each access ring pair 60 is connected between the input end of the fourth wavelength selective switch 4 in the first aggregation site and the output end of the fifth wavelength selective switch 5 in the second aggregation site.

[0139] Optionally, the target wavelength selective switch is the fifth wavelength selective switch 5 in the first aggregation site, or the target wavelength selective switch is the second wavelength selective switch 2 in the second aggregation site, or Figure 5 As shown, the target wavelength selective switch includes a fifth wavelength selective switch 5 in the first aggregation site and a second wavelength selective switch 2 in the second aggregation site.

[0140] For example, if the target wavelength selective switch is the fifth wavelength selective switch 5 in the first aggregation site, then, reference Figure 5 As shown, an input end of the fifth wavelength selective switch 5 in the first aggregation site is connected to an output end of the first wavelength selective switch 1 in the first aggregation site through a third optical fiber 9. Because the first wavelength selective switch 1 and the fifth wavelength selective switch 5 are both in the first aggregation site, the third optical fiber 9 connecting the first wavelength selective switch 1 and the fifth wavelength selective switch 5 is a jumper fiber.

[0141] For another example, the target wavelength selective switch is the second wavelength selective switch 2 in the second aggregation site, then, reference Figure 5 As shown, an input end of the second wavelength selective switch 2 in the second aggregation site and an output end of the fourth wavelength selective switch 4 in the second aggregation site are connected through a third optical fiber 9. Because the second wavelength selective switch 2 and the fourth wavelength selective switch 4 are both in the second aggregation site, the third optical fiber 9 connecting the second wavelength selective switch 2 and the fourth wavelength selective switch 4 is a jumper fiber.

[0142] For another example, the target wavelength selective switch includes a fifth wavelength selective switch 5 in the first aggregation site and a second wavelength selective switch 2 in the second aggregation site. Then, if Figure 5 As shown, in the first convergence site, an output end of the first wavelength selective switch 1 is connected to an input end of the fifth wavelength selective switch 5 through a third optical fiber 9, and the third optical fiber 9 is a jumper fiber. Figure 5 As shown, in the second aggregation site, an output end of the fourth wavelength selective switch 4 is connected to an input end of the second wavelength selective switch 2 through a third optical fiber 9, and the third optical fiber 9 is also a jumper fiber.

[0143] Depend on Figure 5It can be seen that the third optical fiber 9 connecting the first wavelength selective switch 1 and the fifth wavelength selective switch 5, and the third optical fiber 9 connecting the second wavelength selective switch 2 and the fourth wavelength selective switch 4 are both indoor jumper fibers. Figure 4 Compared with the networking architecture shown in the figure, there is no need to pull a relatively long optical fiber between the first aggregation site and the second aggregation site, thereby further reducing the networking engineering workload.

[0144] The above is the networking architecture in this embodiment, and the scheme for realizing inter-ring scheduling in the convergence layer is introduced. Figures 6 to 13 As shown, the connection relationship between the wavelength selective switch of the networking architecture and the equipment in the aggregation site, as well as the connection relationship between the wavelength selective switch and the equipment outside the aggregation site will be introduced.

[0145] in, Figures 6 to 9 The network architecture shown is respectively Figures 2 to 5 The network architectures shown correspond to each other, the difference is Figures 6 to 9 The wavelength selective switch of the networking architecture shown also communicates with the core layer devices outside the aggregation site.

[0146] in, Figures 10 to 13 The network architecture shown is respectively Figures 6 to 9 The network architectures shown correspond to each other, the difference is Figures 10 to 13 The first wavelength selective switch 1 in the networking architecture shown includes a first inner pair of wavelength selective switches 11 and a first outer pair of wavelength selective switches 12, and the second wavelength selective switch 2 includes a second inner pair of wavelength selective switches 21 and a second outer pair of wavelength selective switches 22. The fourth wavelength selective switch 4, which is a backup for the first wavelength selective switch 1, also includes a fourth inner pair of wavelength selective switches 41 and a fourth outer pair of wavelength selective switches 42, and the fifth wavelength selective switch 5, which is a backup for the second wavelength selective switch 2, also includes a fifth inner pair of wavelength selective switches 51 and a fifth outer pair of wavelength selective switches 52.

[0147] It should be pointed out that the wavelength selective switch described above includes an internal wavelength selective switch and an external wavelength selective switch, which is only for distinguishing two different wavelength selective switches and does not constitute a specific limitation.

[0148] like Figures 2 to 5 As shown, the first wavelength selective switch 1 can transmit the aggregated service signal to the first signal receiver in the first aggregation site, so the output end of the first wavelength selective switch 1 is connected to the first signal receiver through an optical fiber. Figures 2 to 5 As shown, the second wavelength selective switch 2 can receive the service signal sent by the second signal transmitter in the second aggregation site, so the input end of the second wavelength selective switch 2 is connected to the second signal transmitter through an optical fiber.

[0149] The first wavelength selective switch 1 and the fourth wavelength selective switch 4 are backup for each other, so if Figure 3 and Figure 5 As shown, the output end of the fourth wavelength selective switch 4 is connected to the second signal receiver through an optical fiber. The second wavelength selective switch 2 and the fifth wavelength selective switch 5 are backup for each other, so Figure 3 and Figure 5 As shown, the input end of the fifth wavelength selective switch 5 is connected to the first signal transmitter through an optical fiber.

[0150] like Figures 6 to 9 As shown, the first wavelength selective switch 1 can also transmit the aggregated service signal to the core layer device outside the first aggregation site, so the output end of the first wavelength selective switch 1 is connected to the core layer device through an optical fiber. Figures 6 to 9 As shown, the second wavelength selective switch 2 can also receive service signals from the core layer device outside the second aggregation site, so the input end of the second wavelength selective switch 2 is connected to the core layer device through an optical fiber.

[0151] Continue to refer Figures 6 to 9 As shown, the core layer device can also send service signals to the signal receiver in the aggregation site, so the core layer device is connected to the first signal receiver through an optical fiber, and the core layer device is connected to the second signal receiver through an optical fiber. The core layer device can also receive service signals sent by the signal transmitter in the aggregation site, so the core layer device is also connected to the first signal transmitter through an optical fiber, and the core layer device is also connected to the second signal transmitter through an optical fiber.

[0152] The fourth wavelength selective switch 4 and the first wavelength selective switch 1 are backup for each other, and the fifth wavelength selective switch 5 and the second wavelength selective switch 2 are backup for each other. Figure 7 and Fig. 9 As shown, the output end of the fourth wavelength selection switch 4 is connected to the second signal receiver through an optical fiber, and the output end of the fourth wavelength selection switch 4 is connected to the core layer device through an optical fiber. The input end of the fifth wavelength selection switch 5 is connected to the first signal transmitter through an optical fiber, and the input end of the fifth wavelength selection switch 5 is connected to the core layer device through an optical fiber.

[0153] in, Figure 8 and Fig. 9 In the figure, the input end of the first wavelength selection switch 1 is connected to the first signal transmitter through an optical fiber in order to connect the first signal transmitter to the core layer device so that the service signal transmitted by the first signal transmitter can be transmitted to the core layer device. Figure 8 and Fig. 9The output end of the second wavelength selection switch 2 is connected to the second signal receiver through an optical fiber in order to connect the core layer device to the second signal receiver so that the core layer device can send a service signal to the second signal receiver.

[0154] like Figures 10 to 13 As shown, the number of output ports of the first wavelength selective switch 1 is insufficient, so, optionally, the first wavelength selective switch 1 is composed of two wavelength selective switches to achieve connection with the first signal receiver and with the core layer device. Therefore, the first wavelength selective switch 1 includes a first inner wavelength selective switch 11 and a first outer wavelength selective switch 12.

[0155] For the same reason, the second wavelength selective switch 2 includes a second inner wavelength selective switch 21 and a second outer wavelength selective switch 22, the fourth wavelength selective switch 4 includes a fourth inner wavelength selective switch 41 and a fourth outer wavelength selective switch 42, and the fifth wavelength selective switch 5 includes a fifth inner wavelength selective switch 51 and a fifth outer wavelength selective switch 52.

[0156] like Fig.10 As shown, multiple input ends of the first pair of internal wavelength selective switches 11 are connected one by one to multiple access rings 6, and multiple output ends of the first pair of internal wavelength selective switches 11 are connected one by one to the first signal receiver and one input end of the first external wavelength selective switch 12. The other input end of the first external wavelength selective switch 12 is connected to the first signal transmitter, and the output end of the first external wavelength selective switch 12 is connected to the core layer device through an optical fiber.

[0157] Continue to refer Fig.10 As shown, multiple output ends of the second pair of inner wavelength selective switches 21 are connected one by one to multiple access rings 6, and multiple input ends of the second pair of inner wavelength selective switches 21 are connected one by one to the second signal transmitter and one output end of the second outer wavelength selective switch 22. Another output end of the second outer wavelength selective switch 22 is connected to the second signal receiver through an optical fiber, and the input end of the second outer wavelength selective switch 22 is connected to the core layer device through an optical fiber.

[0158] In order to achieve inter-ring scheduling, correspondingly, continue to refer to Fig.10 As shown, the input end of the third wavelength selective switch 3 is connected to an output end of the first pair of wavelength selective switches 11 through the first optical fiber 7. Fig.10 As shown, one end of the first optical fiber 7 is connected to the optical path between the output end of the first intra-pair wavelength selective switch 11 and the first signal receiver.

[0159] like Fig.11As shown, one access ring 6 in each access ring pair 60 is connected between the input end of the wavelength selective switch 11 in the first pair and the output end of the wavelength selective switch 21 in the second pair, and the other access ring 6 in each access ring pair 60 is connected between the input end of the wavelength selective switch 41 in the fourth pair and the output end of the wavelength selective switch 51 in the fifth pair.

[0160] Continue to refer Fig.11 As shown, multiple output ends of the first inner wavelength selective switch 11 are respectively connected to the first signal receiver and one input end of the first outer wavelength selective switch 12 through optical fibers. Another input end of the first outer wavelength selective switch 12 is connected to the first signal transmitter through optical fibers, and the output end of the first outer wavelength selective switch 12 is connected to the core layer device through optical fibers.

[0161] Continue to refer Fig.11 As shown, multiple input ends of the second inner wavelength selective switch 21 are respectively connected to the second signal transmitter and one output end of the second outer wavelength selective switch 22 through optical fibers. Another output end of the second outer wavelength selective switch 22 is also connected to the second signal receiver through optical fibers, and the input end of the second outer wavelength selective switch 22 is connected to the core layer device through optical fibers.

[0162] Continue to refer Fig.11 As shown, multiple output ends of the fourth inner wavelength selective switch 41 are respectively connected to the second signal receiver and one input end of the fourth outer wavelength selective switch 42 through optical fibers. Another input end of the fourth outer wavelength selective switch 42 is connected to the second signal transmitter through optical fibers, and the output end of the fourth outer wavelength selective switch 42 is connected to the core layer device through optical fibers.

[0163] Continue to refer Fig.11 As shown, multiple input ends of the fifth inner wavelength selective switch 51 are respectively connected to the first signal transmitter and the output end of the fifth outer wavelength selective switch 52 through optical fibers. The output end of the fifth outer wavelength selective switch 52 is also connected to the first signal receiver through optical fibers, and the input end of the fifth outer wavelength selective switch 52 is connected to the core layer device through optical fibers.

[0164] In order to achieve inter-ring scheduling, correspondingly, continue to refer to Fig.11 As shown, the third wavelength selective switch 3 is located in the first convergence site, and the input end of the third wavelength selective switch is connected to the output end of the first pair of wavelength selective switches 11 through the first optical fiber 7. Fig.11As shown, one end of the first optical fiber 7 is connected to the optical path between the first pair of wavelength selective switches 11 and the first signal receiver. Multiple output ends of the third wavelength selective switch 3 are connected to each access ring 6 connected to the fifth pair of wavelength selective switches 51 through multiple second optical fibers 8. The solution of the third wavelength selective switch 3 being located at the second aggregation site is similar to the above and will not be described in detail.

[0165] like Fig.12 As shown, a plurality of access rings 6 are connected between the input end of the first pair of wavelength selective switches 11 and the output end of the second pair of wavelength selective switches 21 .

[0166] Continue to refer Fig.12 As shown, multiple output ends of the first inner wavelength selective switch 11 are connected one by one to the first signal receiver and one input end of the first outer wavelength selective switch 12. Another input end of the first outer wavelength selective switch 12 is connected to the first signal transmitter through an optical fiber, and the output end of the first outer wavelength selective switch 12 is connected to the core layer device through an optical fiber.

[0167] Continue to refer Fig.12 As shown, the multiple input ends of the second pair of inner wavelength selective switches are connected one by one to the second signal transmitter and one output end of the second outer wavelength selective switch 22. Another output end of the second outer wavelength selective switch 22 is connected to the second signal receiver through an optical fiber, and the input end of the second outer wavelength selective switch 22 is connected to the core layer device through an optical fiber.

[0168] Continue to refer Fig.12 As shown, in order to implement scheduling between the convergence layer rings, an output end of the first pair of wavelength selective switches 11 is connected to an input end of the second pair of wavelength selective switches 21 through the third optical fiber 9.

[0169] like Fig.13 As shown, one access ring 6 in each access ring pair 60 is connected between the input end of the wavelength selective switch 11 in the first pair and the output end of the wavelength selective switch 21 in the second pair, and the other access ring 6 in each access ring pair 60 is connected between the input end of the wavelength selective switch 41 in the fourth pair and the output end of the wavelength selective switch 51 in the fifth pair.

[0170] Continue to refer Fig.13 As shown, multiple output ends of the first inner wavelength selective switch 11 are connected one by one to the first signal receiver and one input end of the first outer wavelength selective switch 12. Another input end of the first outer wavelength selective switch 12 is connected to the first signal transmitter via an optical fiber, and the output end of the first outer wavelength selective switch 12 is connected to the core layer device via an optical fiber.

[0171] Continue to refer Fig.13 As shown, multiple input ends of the second inner wavelength selective switch 21 are connected one by one to the second signal transmitter and one output end of the second outer wavelength selective switch 22. Another output end of the second outer wavelength selective switch 22 is connected to the second signal receiver via an optical fiber. The input end of the second outer wavelength selective switch 22 is connected to the core layer device via an optical fiber.

[0172] Continue to refer Fig.13 As shown, multiple output ends of the fourth inner wavelength selective switch 41 are connected one by one to the second signal receiver and one input end of the fourth outer wavelength selective switch 42. Another input end of the fourth outer wavelength selective switch 42 is connected to the second signal transmitter via an optical fiber, and the output end of the fourth outer wavelength selective switch 42 is connected to the core layer device via an optical fiber.

[0173] Continue to refer Fig.13 As shown, multiple input ends of the fifth inner wavelength selective switch 51 are connected one by one to the first signal transmitter and one output end of the fifth outer wavelength selective switch 52. Another output end of the fifth outer wavelength selective switch 52 is connected to the first signal receiver via an optical fiber. The input end of the fifth outer wavelength selective switch 52 is connected to the core layer device via an optical fiber.

[0174] Continue to refer Fig.13 As shown, in order to realize scheduling between the aggregation layer rings, an output end of the first pair of wavelength selective switches 11 is connected to an input end of the fifth pair of wavelength selective switches 51 through the third optical fiber 9, and / or an output end of the fourth pair of wavelength selective switches 41 is connected to an input end of the second pair of wavelength selective switches 21 through the third optical fiber 9.

[0175] It should be pointed out that Figures 6 to 13 The core layer device in the above is a high-level concept. For example, different wavelength selective switches in the first aggregation site are connected to the same core layer device. For another example, different wavelength selective switches in the first aggregation site are connected to different core layer devices. For another example, the wavelength selective switch in the first aggregation site and the wavelength selective switch in the second aggregation site are connected to the same core layer device or different devices.

[0176] In the embodiment of the present application, an output end of the first wavelength selection switch is connected to each access ring through a target wavelength selection switch. Then, the service signal converged to the first wavelength selection switch can also be transmitted to each access ring through the target wavelength selection switch in the convergence layer to realize all-optical scheduling. Therefore, during scheduling, it is not necessary to transmit through the core layer, and it is not necessary to convert optical signals to electrical signals, and it is not necessary to convert electrical signals to optical signals. Therefore, the delay of inter-ring scheduling can be reduced.

[0177] Furthermore, the service signals that are scheduled between rings do not conflict with the through service signals that pass through the wavelength selection switch and enter the access ring, nor do they conflict with the local service signals that enter the local signal receiver.

[0178] This embodiment also provides a metropolitan optical transmission network system, which includes a core layer, a convergence layer and an access layer, wherein the networking architecture between the convergence layer and the access layer adopts the networking architecture described above.

[0179] The above description is only an embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application should be included in the protection scope of the present application.

Claims

1. A networking architecture, characterized in that: The networking architecture comprises a first wavelength selective switch (1), a second wavelength selective switch (2) and a plurality of access rings (6); The first wavelength selective switch (1) is used to aggregate service signals, and the second wavelength selective switch (2) is used to distribute service signals; Each access ring (6) is connected between the output end of the second wavelength selective switch (2) and the input end of the first wavelength selective switch (1), and the output end of the first wavelength selective switch (1) and each access ring (6) are connected via a target wavelength selective switch.

2. The networking architecture according to claim 1, characterized in that: The second wavelength selective switch (2) is a blocking wavelength selective switch; The target wavelength selective switch is a third wavelength selective switch (3) different from the second wavelength selective switch (2), and the third wavelength selective switch (3) is used to distribute service signals; The input end of the third wavelength selective switch (3) is connected to the output end of the first wavelength selective switch (1), and the multiple output ends of the third wavelength selective switch (3) are connected one by one to each access ring (6).

3. The networking architecture according to claim 2, characterized in that: The third wavelength selective switch (3) is located at the second convergence site where the second wavelength selective switch (2) is located.

4. The networking architecture according to claim 2 or 3, characterized in that: The networking architecture further comprises a fourth wavelength selective switch (4) and a fifth wavelength selective switch (5), wherein the fourth wavelength selective switch (4) and the first wavelength selective switch (1) serve as backup for each other, and the fifth wavelength selective switch (5) and the second wavelength selective switch (2) serve as backup for each other; The first wavelength selective switch (1) and the fifth wavelength selective switch (5) are located at a first convergence site, and the second wavelength selective switch (2) and the fourth wavelength selective switch (4) are located at a second convergence site; The plurality of access rings (6) form a plurality of access ring pairs (60), each access ring pair (60) comprising two access rings (6), one access ring (6) in each access ring pair (60) being connected between an input end of the first wavelength selective switch (1) and an output end of the second wavelength selective switch (2), and the other access ring (6) in each access ring pair (60) being connected between an input end of the fourth wavelength selective switch (4) and an output end of the fifth wavelength selective switch (5); The third wavelength selective switch (3) is located at the first convergence site, and the input end of the third wavelength selective switch (3) is connected to the output end of the first wavelength selective switch (1), and multiple output ends of the third wavelength selective switch (3) are connected one by one to multiple access rings (6) connected to the fifth wavelength selective switch (5), and / or, The third wavelength selective switch (3) is located at the second convergence site, and the input end of the third wavelength selective switch (3) is connected to the output end of the fourth wavelength selective switch (4), and the multiple output ends of the third wavelength selective switch (3) are connected one by one to the multiple access rings (6) connected to the second wavelength selective switch (2).

5. The networking architecture according to any one of claims 2 to 4, characterized in that: A first optical fiber (7) for connecting the input end of the third wavelength selective switch (3) is connected to the output optical path of the first wavelength selective switch (1) through a coupler, or, A first optical fiber (7) for connecting the input end of the third wavelength selective switch (3) is connected to the output port of the first wavelength selective switch (1).

6. The networking architecture according to any one of claims 2 to 5, characterized in that: A second optical fiber (8) for connecting the output end of the third wavelength selective switch (3) and each access ring (6), one end of which is connected to the access ring (6) through a coupler, and the other end of which is connected to the output port of the third wavelength selective switch (3).

7. The networking architecture according to claim 1, characterized in that: The second wavelength selective switch (2) is a non-blocking wavelength selective switch; The target wavelength selective switch is the second wavelength selective switch (2), and an output end of the first wavelength selective switch (1) is connected to an input end of the second wavelength selective switch (2).

8. The networking architecture according to claim 7, characterized in that: The networking architecture further comprises a fourth wavelength selective switch (4) and a fifth wavelength selective switch (5), wherein the fourth wavelength selective switch (4) and the first wavelength selective switch (1) serve as backup for each other, and the fifth wavelength selective switch (5) and the second wavelength selective switch (2) serve as backup for each other; The first wavelength selective switch (1) and the fifth wavelength selective switch (5) are located at a first convergence site, and the second wavelength selective switch (2) and the fourth wavelength selective switch (4) are located at a second convergence site; The plurality of access rings (6) form a plurality of access ring pairs (60), each access ring pair (60) comprising two access rings (6), one access ring (6) in each access ring pair (60) being connected between an input end of the first wavelength selective switch (1) and an output end of the second wavelength selective switch (2), and the other access ring (6) in each access ring pair (60) being connected between an input end of the fourth wavelength selective switch (4) and an output end of the fifth wavelength selective switch (5); The target wavelength selective switch comprises the second wavelength selective switch (2), an output end of the fourth wavelength selective switch (4) is connected to an input end of the second wavelength selective switch (2), and / or, The target wavelength selective switch comprises the fifth wavelength selective switch (5), and an output end of the first wavelength selective switch (1) is connected to an input end of the fifth wavelength selective switch (5).

9. The networking architecture according to any one of claims 1 to 8, characterized in that: The first wavelength selective switch (1) is connected one by one to a plurality of access rings (6) and signal receivers in the aggregation site; The second wavelength selective switch (2) is connected one by one to a plurality of access rings (6) and signal transmitters in the aggregation site where the second wavelength selective switch (2) is located.

10. The networking architecture according to claim 9, characterized in that: The first wavelength selective switch (1) is also connected to the core layer equipment, and the second wavelength selective switch (2) is also connected to the core layer equipment.

11. The networking architecture according to claim 10, characterized in that: The first wavelength selective switch (1) comprises a first inner wavelength selective switch (11) and a first outer wavelength selective switch (12); The first pair of internal wavelength selective switches (11) are respectively connected one by one to a plurality of access rings (6), a signal receiver in a convergence site, and the first external wavelength selective switch (12), and the first external wavelength selective switch (12) is connected to a core layer device.

12. The networking architecture according to claim 10 or 11, characterized in that: The second wavelength selective switch (2) comprises a second inner wavelength selective switch (21) and a second outer wavelength selective switch (22); The second pair of internal wavelength selective switches (21) are respectively connected one by one to a plurality of access rings (6), signal transmitters in the aggregation site, and the second external wavelength selective switch (22), and the second external wavelength selective switch (22) is connected to the core layer equipment.

13. A metropolitan area optical transmission network system, characterized in that: The metropolitan area optical transmission network system includes a core layer, a convergence layer and an access layer, and the networking architecture between the convergence layer and the access layer is the networking architecture described in any one of claims 1 to 12.

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