Photoelectric fusion switching system

Abstract

The invention discloses a photoelectric fusion switching system, which is applied to the technical field of optical communication, aims to solve the problem of poor expansibility of the system, and is characterized in that different wavelength signals in received service information are transmitted to a first target unit through corresponding transmission links by each first line wave combining and separating unit; a multiplexing wavelength signal transmitted by the user wave combining and separating unit is transmitted to a corresponding line optical fiber; the user wave combining and dividing unit demultiplexes received local up-down service wavelength signals into first single-wavelength signals and sends the first single-wavelength signals to the corresponding target client through the packet switching unit; or the packet switching unit takes the first single-wavelength signal as a second single-wavelength signal and sends the second single-wavelength signal to the corresponding user wave combining and separating unit so as to realize the adjustment of the light direction; the packet switching unit multiplexes a second single-wavelength signal corresponding to client service information through a corresponding user wave combining and separating unit and then transmits the multiplexed signal to a corresponding first line wave combining and separating unit to realize client light direction selection; and the expansibility can be improved.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to an optoelectronic fusion switching system. Background Technology

[0002] In a Data Center Interconnect (DCI) scenario, each site typically deploys DCI switching equipment and optical switching equipment (such as...). Figure 1 (As shown). Reconfigurable Optical Add-Drop Multiplexers (ROADMs), as mainstream optical switching equipment, can be dynamically configured remotely to enable the uploading, downloading, and scheduling of service wavelengths. Optical switching equipment can provide high-capacity, low-latency, and transparent optical pipelines, avoiding unnecessary optical-electrical-optical conversions at intermediate nodes, reducing transmission latency and cost, and improving transmission efficiency. DCI switching equipment is an electrical packet switching unit, mostly routers or switches, deployed at both ends of the optical pipeline as electrical packet switching units. It can perform flow control, load balancing, and advanced network policies according to service requirements, ensuring service transmission quality and security.

[0003] Existing DCI electrical switching and ROADM separation architecture (such as...) Figure 2 As shown, the layering is clear and the management interface is distinct, but there are obvious defects: First, the upper and lower service units of ROADM are mostly implemented using multi-cast switches (MCS) or wavelength selective switches (WSS), which limits the port scale, has poor scalability, and is difficult to adapt to multi-site interconnection scenarios; Second, there is an overlap in optical direction selection functions between the electrical packet switch and the upper and lower service units of the optical layer, resulting in resource redundancy. Summary of the Invention

[0004] The purpose of this application is to provide an optoelectronic fusion switching system that can reduce resource waste, improve scalability, and facilitate adaptation to multi-site interconnection scenarios during use.

[0005] To address the aforementioned technical problems, the embodiments of this application provide the following technical solutions: This application provides an optoelectronic converged switching system, comprising: multiple first-line multiplexing / demultiplexing units, multiple user multiplexing / demultiplexing units, and a packet switching unit. Each first-line multiplexing / demultiplexing unit corresponds to a first-line optical fiber with a different optical direction. The first-line multiplexing / demultiplexing units are interconnected in pairs. Each first-line multiplexing / demultiplexing unit is connected to each of the user multiplexing / demultiplexing units in a one-to-one correspondence. Each user multiplexing / demultiplexing unit is connected to the packet switching unit. Wherein: The first line multiplexing / demultiplexing unit is used to transmit different wavelength signals from the service information received from the first line optical fiber to the corresponding first target unit through the corresponding transmission link; and to transmit the multiplexed wavelength signal transmitted by the user multiplexing / demultiplexing unit to the first line optical fiber in the corresponding optical direction. The user multiplexing / demultiplexing unit is used to demultiplex the local add / drop service wavelength signals transmitted by the first line multiplexing / demultiplexing unit into a first single-wavelength signal; and to multiplex the second single-wavelength signal transmitted by the packet switching unit and transmit it to the corresponding first line multiplexing / demultiplexing unit. The packet switching unit is used to send the received first single-wavelength signal to the corresponding target client or to send the first single-wavelength signal as a second single-wavelength signal to the corresponding user multiplexing / demultiplexing unit; it is also used to send the second single-wavelength signal corresponding to the client service information to the corresponding user multiplexing / demultiplexing unit.

[0006] In one embodiment, the port on the packet switching unit used for receiving client service information is equipped with a gray light module, and the port on the packet switching unit corresponding to at least one user multiplexing / demultiplexing unit is equipped with a colored light module. The packet switching unit is connected to the corresponding user multiplexing / demultiplexing unit through the colored light module of the corresponding port.

[0007] In one embodiment, the port on the packet switching unit corresponding to at least one user multiplexing / demultiplexing unit is provided with a gray light module, and the system further includes an optical wavelength conversion unit, the gray light module being connected to the corresponding user multiplexing / demultiplexing unit through the optical wavelength conversion unit.

[0008] In one embodiment, the transmission of different wavelength signals from the service information received from the first optical fiber to the corresponding first target unit via a corresponding transmission link includes: For different wavelength signals in the service information received from the first optical fiber, a first target transmission link corresponding to the wavelength signal is determined according to the transmission link pre-set for each wavelength signal, and the wavelength signal is transmitted to the corresponding first target unit through the first target transmission link; wherein, the first target unit is another first line multiplexing / demultiplexing unit or the corresponding user multiplexing / demultiplexing unit.

[0009] In one embodiment, the packet switching unit is specifically used for: Based on the port receiving the first single-wavelength signal and in conjunction with the pre-established correspondence between ports, a first target port corresponding to the port receiving the first single-wavelength signal is determined, and the first single-wavelength signal is sent to the first target port; wherein, if the first target port is a client port connected to a client, it is sent to the corresponding target client; if the first target port is a port connected to another user multiplexing / demultiplexing unit, the first single-wavelength signal is sent as a second single-wavelength signal to the corresponding user multiplexing / demultiplexing unit. Based on the port where the client service information is received, and in conjunction with the pre-established correspondence between ports, a second target port corresponding to the port where the client service information is received is determined, and a second single-wavelength signal corresponding to the client service information is sent to the corresponding user multiplexing / demultiplexing unit through the second target port.

[0010] In one embodiment, there are multiple packet switching units, and any one of the packet switching units is connected to each of the user multiplexing / demultiplexing units.

[0011] In one embodiment, it further includes: a space-division switching unit, the space-division switching unit being connected to a plurality of second line optical fibers in multiple optical directions, the space-division switching unit being connected to each corresponding first line multiplexing and splitting unit through each of the first line optical fibers; The space-division switching unit is used to determine, for each of the second line optical fibers, the optical fiber path corresponding to the service signal received through the second line optical fiber, based on the second line optical fiber and the pre-established correspondence between line optical fibers, and to send the wavelength signal in the service signal to the corresponding target line optical fiber based on the optical fiber path.

[0012] In one embodiment, the first line multiplexing / splitting unit is a first wavelength selection switch or a first arrayed waveguide grating; and / or, the user multiplexing / splitting unit is a second wavelength selection switch or a second arrayed waveguide grating.

[0013] In one embodiment, the space-division switching unit is a matrix optical switch based on a microelectromechanical system (MEMS).

[0014] In one embodiment, it further includes a plurality of second line multiplexing and demultiplexing units, each second line multiplexing and demultiplexing unit corresponding to a third line light beam with a different optical direction, the optical direction of the third line light beam being different from the optical direction of each first line light beam, any two line multiplexing and demultiplexing units between each second line multiplexing and demultiplexing unit and each first line multiplexing and demultiplexing unit being interconnected, and each second line multiplexing and demultiplexing unit being connected to a corresponding port of the packet switching unit. The second line multiplexing / demultiplexing unit is used to determine the second target transmission link corresponding to the wavelength signal based on the transmission links pre-set for different wavelength signals in the service information received from the third line optical fiber, and transmit the wavelength signal to the corresponding second target unit through the second target transmission link; wherein, the second target unit is another first line multiplexing / demultiplexing unit or another second line multiplexing / demultiplexing unit or the packet switching unit.

[0015] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: This application provides an optoelectronic converged switching system, including: multiple first-line multiplexing / demultiplexing units, multiple user multiplexing / demultiplexing units, and a packet switching unit. Each first-line multiplexing / demultiplexing unit corresponds to a first-line optical fiber with a different optical direction. The first-line multiplexing / demultiplexing units are interconnected in pairs. Each first-line multiplexing / demultiplexing unit is connected to each user multiplexing / demultiplexing unit in a one-to-one correspondence. Each user multiplexing / demultiplexing unit is connected to the packet switching unit. Specifically, the first-line multiplexing / demultiplexing units are used to transmit different wavelength signals from service information received from the first-line optical fiber to the corresponding first target unit through corresponding transmission links; and to multiplex / demultiplex the user multiplexing / demultiplexing units. The multiplexed wavelength signal transmitted by the wave unit is transmitted to the first line optical fiber in the corresponding optical direction; the user multiplexing / demultiplexing unit is used to demultiplex the local add / drop service wavelength signals transmitted by the first line multiplexing / demultiplexing unit into a first single wavelength signal; the second single wavelength signal transmitted by the packet switching unit is multiplexed and transmitted to the corresponding first line multiplexing / demultiplexing unit; the packet switching unit is used to send the received first single wavelength signal to the corresponding target client or send the first single wavelength signal as the second single wavelength signal to the corresponding user multiplexing / demultiplexing unit; the second single wavelength signal corresponding to the client service information is sent to the corresponding user multiplexing / demultiplexing unit.

[0016] Therefore, in the optoelectronic converged switching system of this application embodiment, different wavelength signals from the service information received from the first line optical fiber are transmitted to the corresponding first target unit through the corresponding transmission link by each first line multiplexing / demultiplexing unit, and the multiplexed wavelength signal transmitted by the user multiplexing / demultiplexing unit is transmitted to the first line optical fiber with the corresponding optical direction; the user multiplexing / demultiplexing unit demultiplexes the local add / drop service wavelength signals transmitted by the first line multiplexing / demultiplexing unit into a first single wavelength signal, and multiplexes the second single wavelength signal transmitted by the packet switching unit and transmits it to the corresponding first line multiplexing / demultiplexing unit; the packet switching unit adjusts the optical direction by sending the received first single wavelength signal to the corresponding target client, or by sending the first single wavelength signal as the second single wavelength signal to the corresponding user multiplexing / demultiplexing unit, and sends the second single wavelength signal corresponding to the client service information to the corresponding user multiplexing / demultiplexing unit to select the optical direction of the client wavelength. This application eliminates the optical switching-based uplink and downlink service units and uses an electrical switching-based packet switching unit to achieve optical direction selection for service uplink and downlink. This reduces resource waste caused by functional overlap between components. Furthermore, since the electrical switching-based packet switching unit has far more ports than the uplink and downlink service units, it can improve scalability and is beneficial for adapting to multi-site interconnection scenarios. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an application scenario intended for an existing data center interconnection demonstration; Figure 2 This is a schematic diagram of the structure of an existing optoelectronic fusion switching system; Figure 3 This is a schematic diagram of the structure of an optoelectronic fusion switching system provided in an embodiment of this application; Figure 4 This is a schematic diagram of another optoelectronic fusion switching system provided in an embodiment of this application; Figure 5 A schematic diagram of wavelength signal transmission in an optoelectronic fusion switching system provided in this application embodiment; Figure 6 A schematic diagram of another optoelectronic fusion switching system provided in the embodiments of this application; Figure 7 To and Figure 6 A schematic diagram of a corresponding wavelength signal transmission; Figure 8 A schematic diagram of another optoelectronic fusion switching system provided in the embodiments of this application; Figure 9 A schematic diagram of another optoelectronic fusion switching system provided in the embodiments of this application; Figure 10 This is a schematic diagram of another optoelectronic fusion switching system provided in an embodiment of this application. Detailed Implementation

[0019] This application provides an optoelectronic fusion switching system that reduces resource waste, improves scalability, and is suitable for multi-site interconnection scenarios.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] It's important to note that in data center interconnect (DCI) applications, each site deploys both DCI and optical switching equipment. Reconfigurable optical add-drop multiplexers (ROADMs), as optical switching devices, can dynamically add or remove service wavelengths through remote reconfiguration, enabling flexible service scheduling. Optical switching equipment provides a high-capacity, transparent, and low-latency optical pipeline, avoiding unnecessary electrical layer processing (optical-electrical-optical conversion) at intermediate nodes, thus saving costs, reducing latency, and improving transmission efficiency. Meanwhile, DCI switching equipment for data center interconnects, which are electrical packet switching units (such as routers or switches), are located at both ends of the pipeline. They perform flow control, load balancing, and advanced network policy implementation based on service requirements, ensuring service quality and security.

[0022] like Figure 2 The DCI electrical switching combined with ROADM architecture shown can be divided into two parts: the line side and the user side. The user side includes an Optical Transponder Unit (OTU) and add / drop service units. The OTU connects to the electrical packet switch, converts the incoming customer service to a specific wavelength, and then transmits it to the add / drop service units. The add / drop service units are used to select the optical direction of the customer's wavelength and transmit it to different line multiplexing / demultiplexing units based on the destination site of the customer service. On the line side, the line multiplexing / demultiplexing units multiplex wavelengths from the add / drop service units and other line multiplexing / demultiplexing units onto a single optical fiber for transmission.

[0023] The existing architecture that separates electrical and optical switching has the following problems: First, the scalability of the uplink and downlink service units is relatively poor: Currently, the uplink and downlink service units mainly have two structures: multicast switching optical switch (MCS) and M×N port wavelength selective switch (WSS). The commonly used ones are 8×24 MCS and 8×24 WSS, which only support 24 uplink and downlink service ports and 8 different optical directions. In scenarios where a large number of interconnected sites are required, it is difficult to expand.

[0024] Second, functional overlap: Electrical packet switches also have path selection capabilities, and their functions overlap to some extent with the upper and lower service units of the optical layer.

[0025] Third, the business processes need to go through the OTU unit and undergo multiple optical-electrical-optical conversions, which increases power consumption costs.

[0026] In view of this, the present application provides an optoelectronic converged switching system, which eliminates the optical switching-based uplink and downlink service units and realizes the optical direction selection of uplink and downlink services through the packet switching unit based on electrical switching, thereby reducing the resource waste caused by functional overlap between components. Moreover, the packet switching unit has a much larger number of ports and stronger scalability.

[0027] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of an optoelectronic converged switching system provided in an embodiment of this application. The optoelectronic converged switching system includes: multiple first-line multiplexing / demultiplexing units 1, multiple user multiplexing / demultiplexing units 2, and a packet switching unit 3. Each first-line multiplexing / demultiplexing unit 1 corresponds to a first-line optical fiber 4 with a different optical direction. The first-line multiplexing / demultiplexing units 1 are interconnected in pairs. Each first-line multiplexing / demultiplexing unit 1 is connected to each user multiplexing / demultiplexing unit 2 in a one-to-one correspondence. Each user multiplexing / demultiplexing unit 2 is connected to the packet switching unit 3. Wherein: The first line multiplexing and demultiplexing unit 1 is used to transmit different wavelength signals from the service information received from the first line optical fiber 4 to the corresponding first target unit through the corresponding transmission link; and to transmit the multiplexed wavelength signal transmitted by the user multiplexing and demultiplexing unit 2 to the first line optical fiber 4 in the corresponding optical direction. User multiplexing / demultiplexing unit 2 is used to demultiplex the local add / drop service wavelength signals transmitted by the first line multiplexing / demultiplexing unit 1 into a first single wavelength signal; and to multiplex the second single wavelength signal transmitted by the packet switching unit 3 and transmit it to the corresponding first line multiplexing / demultiplexing unit 1. Packet switching unit 3 is used to send the received first single-wavelength signal to the corresponding target client or to send the first single-wavelength signal as a second single-wavelength signal to the corresponding user multiplexing / demultiplexing unit 2; it is also used to send the second single-wavelength signal corresponding to the client service information to the corresponding user multiplexing / demultiplexing unit 2.

[0028] It should be noted that the first line multiplexing / demultiplexing unit 1 in this embodiment can receive service information transmitted from the first line optical fiber 4 connected to it. This service information includes at least one wavelength signal. In practical applications, the wavelengths of each wavelength signal transmitted by each first line optical fiber 4 can be preset. For example, the first first line optical fiber 4 transmits wavelength signals corresponding to wavelengths 1, 2, 3, and 4, respectively, and the second first line optical fiber 4 transmits wavelength signals corresponding to wavelengths 2 and 4, respectively. After receiving the wavelength signal, each first line optical fiber 4 can determine the first target unit corresponding to the wavelength signal according to the preset transmission link corresponding to each wavelength, and then send the wavelength signal to the first target unit. This allows the determination of the first target unit corresponding to each wavelength signal, enabling selection of the line-side wavelength. Since the first line multiplexing / demultiplexing units 1 in this embodiment are fully interconnected, the first target unit can be another first line multiplexing / demultiplexing unit 1 or a corresponding user multiplexing / demultiplexing unit 2, which can be set according to actual needs. The first line multiplexing / demultiplexing unit 1 can transmit the multiplexed wavelength signal transmitted from the user multiplexing / demultiplexing unit 2 to the first line optical fiber 4 in the corresponding optical direction. Of course, if wavelength signals sent by other line multiplexing / demultiplexing units 1 are also received, the received wavelength signals are multiplexed and then sent to the same first line optical fiber 4.

[0029] In other words, on the receiving side, after the first line multiplexing / demultiplexing unit 1 receives service information from the corresponding first line optical fiber 4, it sends the wavelength signal corresponding to the service information to the corresponding other modules according to the wavelength. Specifically, for wavelength signals that need to be switched locally, the wavelength signal is sent to the corresponding other first line multiplexing / demultiplexing units; for wavelength signals that need to be added or removed locally, the wavelength signal is sent to the user multiplexing / demultiplexing unit 2. On the transmitting side, the first line multiplexing / demultiplexing unit 1 receives the added or removed wavelength signals from the local user multiplexing / demultiplexing unit 2 and the wavelength signals sent by other first line multiplexing / demultiplexing units for switching, and multiplexes these wavelength signals into a single first line optical fiber 4 for transmission.

[0030] In this embodiment, the user multiplexing / demultiplexing unit 2 can be used to multiplex and demultiplex local add-on / demultiplex services. Specifically, on the receiving side, after receiving the local add-on / demultiplex service wavelength signal transmitted from the first line multiplexing / demultiplexing unit 1, the received local add-on / demultiplex service wavelength signal is demultiplexed into the corresponding first single-wavelength signal. For example, if the received signal includes wavelength 1, wavelength 2, and wavelength 3, the wavelength signals corresponding to wavelength 1, wavelength 2, and wavelength 3 are demultiplexed from the local add-on / demultiplex service wavelength signal, and then these wavelength signals are sent to the packet switching unit 3. On the transmitting side, the user multiplexing / demultiplexing unit 2 receives the second single-wavelength signal sent by the packet switching unit 3, and multiplexes the received second single-wavelength signal before transmitting it to the corresponding first line multiplexing / demultiplexing unit 1.

[0031] Packet switching unit 3 will send the first single-wavelength signal received from user multiplexing / demultiplexing unit 2 to the corresponding target client or send the first single-wavelength signal as the second single-wavelength signal to other corresponding user multiplexing / demultiplexing units 2; and send the second single-wavelength signal received corresponding to the client service information to the corresponding user multiplexing / demultiplexing unit 2.

[0032] It should be noted that the packet switching unit 3 in this embodiment is mainly used to implement optical direction selection for uplink and downlink services, bandwidth aggregation, signal regeneration, and wavelength conversion. For uplink services, the packet switching unit 3 receives the uplink and downlink service information (i.e., client service information) sent by the client side and sends the client service information to the corresponding user multiplexing / demultiplexing unit. Specifically, the corresponding line-side port can be determined by preset rules, and the information is sent to the user multiplexing / demultiplexing unit 2 with a specific optical direction through the line-side port, thereby achieving optical direction selection. For downlink services, the packet switching unit 3 receives the first single-wavelength signal sent by the user multiplexing / demultiplexing unit 2 and sends the first single-wavelength signal to the port of the corresponding target client for transmission to the client device.

[0033] In practical applications, packet switching unit 3 can be a switch or a router, and the port selection of packet switching unit 3 can be achieved through methods such as VLAN isolation, static forwarding, ACL, SR-TE specifying the outgoing port.

[0034] In one embodiment, the first line multiplexing / splitting unit 1 may employ a first wavelength selection switch (WSS) or a first arrayed waveguide grating (AWG); and / or, the user multiplexing / splitting unit 2 may also employ a second wavelength selection switch (WSS) or a second arrayed waveguide grating (AWG).

[0035] like Figure 4As shown, in one embodiment, the port on the packet switching unit 3 used to receive client service information is provided with a gray light module 31, and the port on the packet switching unit 3 corresponding to at least one user multiplexing / demultiplexing unit 2 is provided with a colored light module 32. The packet switching unit 3 is connected to the corresponding user multiplexing / demultiplexing unit 2 through the colored light module 32 of the corresponding port.

[0036] It should be noted that the client side of the packet switching unit 3 is equipped with multiple gray light modules 31 (which can be set up by plugging in) to receive client service signals. On the other side of the packet switching unit 3, a colored light module 32 in ZR / ZR+ form (which can also be set up by plugging in) can be directly connected to the user multiplexing and demultiplexing unit 2. For the port equipped with the colored light module 32, there is no need to use an optical wavelength conversion unit (OTU) for wavelength conversion, thereby saving power consumption.

[0037] In one embodiment, the port on the packet switching unit 3 corresponding to at least one user multiplexing / demultiplexing unit 2 is provided with a gray light module 33, and the system also includes an optical wavelength conversion unit 5. The gray light module 33 is connected to the corresponding user multiplexing / demultiplexing unit 2 through the optical wavelength conversion unit 5.

[0038] In other words, such as Figure 4 As shown, in this embodiment of the application, the port of the packet switching unit 3 corresponding to at least one user multiplexing / demultiplexing unit 2 is provided with a gray light module 33. Alternatively, a gray light module 33 can be provided. For the port where the gray light module 33 is provided, an OTU unit 5 is also required so that the gray light module 33 on the packet switching unit 3 can be connected to the corresponding user multiplexing / demultiplexing unit 2 through the OTU unit 5. The wavelength is converted through the OTU unit 5 and then sent to the user multiplexing / demultiplexing unit 2.

[0039] In one embodiment, the process by which the first line multiplexing / demultiplexing unit 1 transmits different wavelength signals from the service information received from the first line optical fiber to the corresponding first target unit through the corresponding transmission link includes: For different wavelength signals in the service information received from the first optical fiber, a first target transmission link corresponding to the wavelength signal is determined according to the transmission link pre-set for each wavelength signal, and the wavelength signal is transmitted to the corresponding first target unit through the first target transmission link; wherein, the first target unit is another first line multiplexing / demultiplexing unit or the corresponding user multiplexing / demultiplexing unit.

[0040] In other words, in practical applications, the wavelengths of the signals transmitted by the first optical fiber in each different optical direction can be pre-set. For example, the first optical fiber 4 transmits wavelength signals corresponding to wavelengths 1, 2, 3, and 4, respectively, while the second optical fiber 4 transmits wavelength signals corresponding to wavelengths 2 and 4, and so on. A transmission link corresponding to each wavelength is pre-set, including a mapping relationship between the signal transmitter, wavelength, and signal receiver. For instance, wavelength signals corresponding to wavelengths 1, 2, and 3 transmitted from the first optical fiber 4 are transmitted to the corresponding user multiplexing / demultiplexing unit 2, and wavelength signal corresponding to wavelength 4 is transmitted to the second first optical fiber multiplexing / demultiplexing unit 4, and so on. Thus, after receiving a wavelength signal, each first optical fiber 4 can determine the first target unit corresponding to that wavelength signal based on the pre-set transmission link, and then send the wavelength signal to that first target unit, achieving wavelength selection on the line side.

[0041] The first target unit can be another first line multiplexing / splitting unit 1, or the corresponding user multiplexing / splitting unit 2, which can be determined according to actual setting requirements.

[0042] In one embodiment, packet switching unit 3 is specifically used for: Based on the port receiving the first single-wavelength signal and in conjunction with the pre-established correspondence between ports, a first target port corresponding to the port receiving the first single-wavelength signal is determined, and the first single-wavelength signal is sent to the first target port; wherein, if the first target port is a client port connected to a client, it is sent to the corresponding target client; if the first target port is a port connected to another user multiplexing / demultiplexing unit, the first single-wavelength signal is sent as a second single-wavelength signal to the corresponding user multiplexing / demultiplexing unit. Based on the port that receives the client service information, and in conjunction with the pre-established correspondence between ports, a second target port corresponding to the port that receives the client service information is determined, and the second single-wavelength signal corresponding to the client service information is sent to the corresponding user multiplexing / demultiplexing unit through the second target port.

[0043] It should be noted that, in practical applications, for each port on the packet switching unit 3, the ports used to connect to the user multiplexing / demultiplexing unit are designated as first ports, and the ports used for user-client interaction are designated as second ports. That is, the packet switching unit 3 receives the first single-wavelength signal through the first port and receives client service information through the second port. In this embodiment, a mapping relationship between each first port and each second port can be pre-established. A second port can be mapped to a first port of a specific wavelength in a corresponding optical direction, and a first port can also be mapped to first ports of the same or different wavelengths in other optical directions. Each first port can correspond to a specific wavelength, thus receiving the first single-wavelength signal of the corresponding wavelength sent by the user multiplexing / demultiplexing unit 2 in the corresponding optical direction through the first port. Then, according to the mapping relationship between the first port and other ports, the first single-wavelength signal is sent to the corresponding other ports, which can be the corresponding second port or a first port in another optical direction.

[0044] In this embodiment, after receiving a first single-wavelength signal through a first port, the packet switching unit 3 can determine a first target port corresponding to the first port based on the first port and a pre-established correspondence between ports, and then send the first single-wavelength signal to the first target port. If the first target port is a second port, the first single-wavelength signal can be sent to the target client corresponding to the second port through the second port. If the first target port is a first port in another optical direction, the first single-wavelength signal can be sent as a second single-wavelength signal to the first port to be sent to the user multiplexing / demultiplexing unit 2 in the corresponding optical direction through the first port.

[0045] Of course, after receiving client service information through a certain second port, packet switching unit 3 can also determine the second target port corresponding to the second port based on the second port and the pre-established correspondence between ports, and send the second single-wavelength signal corresponding to the client service information to the corresponding user multiplexing / demultiplexing unit 2 through the second target port.

[0046] Please refer to Figure 5 This application uses a four-optical-direction switching node as an example for illustration, wherein each optical direction supports four wavelengths multiplexed. The first line multiplexing / demultiplexing unit is WSS, the user multiplexing / demultiplexing unit is AWG, the packet switching unit is a switch, and the colored optical module can be a ZR optical module to directly output colored light.

[0047] Specifically, in practical applications, packet switches can be used to implement three different types of services: The first type is local upload / download services: such as... Figure 5 As shown in ①, both port 1 and port 3 are local upload / download services. By configuring the port mapping relationship of the switch, the service of port 1 is directed to optical direction 1, and the wavelength of the corresponding wavelength signal is wavelength 2 (i.e., λ2). By configuring the port mapping relationship of the switch, the service of port 3 is directed to optical direction 4, and the wavelength of the corresponding wavelength signal is wavelength 1 (i.e., λ1).

[0048] The second type is relay service / wavelength conversion: such as Figure 5 In the service shown in ②, optical direction 1 receives four wavelengths from the line side. Wavelength 4 (λ4) is directly forwarded from the first WSS to the second WSS corresponding to optical direction 2 via wavelength switching. λ1, λ2, and λ3 are sent to the packet switching unit Switch via the first user multiplexing / demultiplexing unit AWG. λ1 is forwarded by the packet switching unit to the port corresponding to λ2 in the second AWG corresponding to optical direction 2, so that λ1 is remodulated as wavelength 2 and sent to the second WSS. Finally, the second WSS combines λ2 and λ4 and sends them to the second first-line fiber. When wavelength signals are transmitted long distances in optical fibers, attenuation, noise, dispersion, nonlinear effects, and other impairments accumulate, causing their quality to degrade to an unusable level. In this case, the signal can be sent to the packet switching unit for signal regeneration. Additionally, in cases of wavelength resource conflict—that is, when the same wavelength is occupied on the end-to-end path, or when a wavelength change is needed to resolve the conflict—wavelength conversion can also be performed through regeneration by the packet switching unit. Specifically, port mapping relationships can be pre-configured.

[0049] The third type is bandwidth aggregation: such as Figure 5 For the services shown in ③, if the bandwidth of certain wavelengths is not fully utilized, services from multiple wavelengths can be aggregated into one wavelength to improve the carrying efficiency of the wavelength. For example, if the service bandwidth carried by λ3 in optical direction 1 is small and does not fully utilize the wavelength bandwidth, then when it is forwarded to optical direction 3, the services of λ3 in optical direction 1 and local port 2 can be aggregated into the same wavelength, sent to optical direction 3, and modulated to wavelength 1.

[0050] Therefore, it can be seen that the optoelectronic fusion switch provided in the embodiments of this application does not require the use of MCS, M Optical devices such as N WSS can achieve optical direction selection for uplink and downlink services, relay regeneration, wavelength conversion, and bandwidth aggregation through electrical packet switching. Among these, relay regeneration can increase transmission distance and enable long-distance transmission, wavelength conversion can reduce wavelength conflicts at ROADM nodes, and bandwidth aggregation can improve bandwidth utilization.

[0051] In one embodiment, there are multiple packet switching units 3, and any one of the packet switching units 3 is connected to each user multiplexing / demultiplexing unit 2.

[0052] It should be noted that when the capacity and number of ports of packet switching unit 3 are insufficient, multiple packet switching units 3 can be combined to achieve high-capacity access and switching. For example, M user multiplexing / demultiplexing units 2 and N packet switching units 3 can be configured. The M user multiplexing / demultiplexing units 2 and N packet switching units 3 are connected in a fully bipartite graph topology, meaning that each packet switching unit 3 is connected to all user multiplexing / demultiplexing units 2, and each user multiplexing / demultiplexing unit 2 is also connected to all packet switching units 3. The connection between any two units can be one port or multiple ports. Figure 6 As shown, M is 4 and N is also 4. Only one port is connected between a user multiplexing / demultiplexing unit 2 and a packet switching unit 3. The packet switching unit 3 can directly use the line-side port of the ZR / ZR+ optical module, or it can plug in a gray optical module and then perform wavelength conversion through the OTU unit. The specific configuration can be set according to actual needs.

[0053] based on Figure 6 The optoelectronic converged switching system architecture shown is consistent with... Figure 5 The transmission paths for the corresponding wavelength signals can be as follows: Figure 7 As shown, where, Figure 7 This is a four-directional optical switching node, with each direction supporting four wavelengths for multiplexing. The line multiplexing / demultiplexing unit is a WSS (Wavelength Switching System). To increase flexibility, the user multiplexing / demultiplexing unit also uses WSS. Four switches are used as packet switching units, and ZR optical modules are used to directly output colored light. Figure 4 The four services were distributed across four switches.

[0054] In one implementation, such as Figure 8 As shown, the system may also include: a space-division switching unit 6, which is connected to a second line optical fiber 7 in multiple optical directions, and the space-division switching unit 6 is connected to the corresponding first line multiplexing and splitting units 1 through each first line optical fiber 4. The space-division switching unit 6 is used to determine the optical fiber path corresponding to the service signal received through the second optical fiber 7 for each second optical fiber 7, based on the second optical fiber 7 and the pre-established correspondence between optical fibers, and to send the wavelength signal in the service signal to the corresponding target optical fiber based on the optical fiber path.

[0055] It should be noted that in scenarios with very high traffic volumes, wavelength switching can be too granular. In such cases, a space-division switching unit (SDI) can be added to achieve fiber-level cross-connection, thus forming a three-level switching system of fiber-wavelength-packet. For example... Figure 8 The system shown mainly includes: a space-division switching unit 6, a first-line multiplexing / demultiplexing unit 1, a user multiplexing / demultiplexing unit 2, and a packet switching unit 3. The wavelengths of the signals transmitted in each of the second-line optical fibers can be pre-set, and the corresponding optical fibers for each second-line optical fiber 7 can be pre-set according to actual needs. For example, the mapping relationship between the second-line optical fiber 7 and the first-line optical fiber can be determined, or the mapping relationship between a certain second-line optical fiber 7 and other second-line optical fibers 7 can be established. In other words, the space-division switching unit 6 in this embodiment can perform fiber-level switching on the optical fibers. For services that do not require local wavelength switching and packet switching, the space-division switching unit 6 directly determines the other second-line optical fiber 7 corresponding to the received service information based on the second-line optical fiber 7 and the pre-established correspondence between optical fibers, and then sends the service information to the second-line optical fiber 7 in the corresponding optical direction, thus achieving fiber-level switching. In addition, for services that require local wavelength switching or packet switching, the space division switching unit 6 determines, based on the second line fiber 7 that receives the service information and the pre-established correspondence between line fibers, that the line fiber corresponding to the second line fiber is the first line fiber. The space division switching unit 6 then switches the corresponding service information through the first line fiber to the corresponding first line multiplexing / splitting unit for subsequent local wavelength switching or packet switching.

[0056] Specifically, the space-division switching unit 6, based on the second line fiber 7 that receives the service information and combined with the pre-established correspondence between line fibers, determines that the line fiber corresponding to the second line fiber is another second line fiber. This indicates that the service received by the second line fiber does not require local wavelength switching or packet switching. If it is determined that the line fiber corresponding to the second line fiber is a first line fiber, this indicates that the service received by the second line fiber requires local wavelength switching or packet switching.

[0057] In practical applications, the space-division switching unit 6 can employ a matrix optical switch based on microelectromechanical systems (MEMS). This matrix optical switch uses a miniature movable mirror array to achieve optical path switching and cross-connection, featuring low insertion loss, low crosstalk, fast response speed, high extinction ratio, and characteristics such as wavelength independence, protocol transparency, and strong channel scalability. It can realize all-optical non-blocking switching from any input port to any output port.

[0058] The first line multiplexing / splitting unit 1 performs wavelength selection on the services transmitted by the space-division switching unit 6, and the first line multiplexing / splitting units 1 are fully interconnected. On the receiving side, the line multiplexing / splitting unit 1 receives services from the space-division switching unit 6, and sends the wavelength signal corresponding to the service information to other corresponding modules according to the wavelength. For wavelength signals that need to be switched locally, the wavelength signal is sent to other first line multiplexing / splitting units 1; for wavelengths that need to be added or removed locally, the wavelength signal is sent to the user multiplexing / splitting unit 2. On the transmitting side, the first line multiplexing / splitting unit 1 receives the added or removed wavelengths of the local user multiplexing / splitting unit 2 and the switched wavelengths of other first line multiplexing / splitting units, and multiplexes these wavelength signals into a single first line optical fiber to transmit to the space-division multiplexing / splitting unit 6. The information interaction between the first line multiplexing / splitting unit and the user multiplexing / splitting unit 2 or other first line multiplexing / splitting units can be referred to the description in the above embodiments, and will not be repeated here.

[0059] The information interaction between the user multiplexing / splitting unit 2 and the first line multiplexing / splitting unit 1 can also refer to the description in the above embodiments, and will not be repeated here in the embodiments of this application.

[0060] In one embodiment, the system may further include a plurality of second line multiplexing and demultiplexing units 8, each second line multiplexing and demultiplexing unit 8 corresponding to a third line ray 9 with a different optical direction, the optical direction of the third line ray 9 being different from the optical direction of each first line ray 4, any two line multiplexing and demultiplexing units between each second line multiplexing and demultiplexing unit 8 and each first line multiplexing and demultiplexing unit 1 being interconnected, and each second line multiplexing and demultiplexing unit 8 being connected to the corresponding port of the packet switching unit 3. The second line multiplexing / demultiplexing unit 8 is used to determine the second target transmission link corresponding to the wavelength signal based on the transmission link pre-set for each wavelength signal in the service information received from the third line optical fiber 9, and transmit the wavelength signal to the corresponding second target unit through the second target transmission link; wherein the second target unit is another first line multiplexing / demultiplexing unit 1 or another second line multiplexing / demultiplexing unit 8 or packet switching unit 3.

[0061] It should be noted that, when the number of ports in the line multiplexing / demultiplexing unit is sufficient, the line multiplexing / demultiplexing unit can also directly demultiplex services that need to be transferred locally into multiple single-wavelength signals, and directly connect these single-wavelength signals to the packet switching unit, thus eliminating the need for intermediate user multiplexing / demultiplexing units. For example... Figure 9As shown, in practical applications, multiple second-line multiplexing / demultiplexing units 8 (e.g., two) can be further configured. Each second-line multiplexing / demultiplexing unit 8 can be directly connected to the colored optical module on the packet switching unit 3, thereby directly transmitting the wavelength signal requiring uplink / downlink services to the corresponding port of the corresponding packet switching unit. Alternatively, a mapping relationship can be pre-established between each second-line multiplexing / demultiplexing unit and other line multiplexing / demultiplexing units or with the packet switching unit. This allows the second target transmission link and the corresponding second target unit to be determined based on the third-line optical fiber 9 receiving the service information, and the wavelength signal can be transmitted to the corresponding second target unit through the second target transmission link.

[0062] Therefore, in the optoelectronic converged switching system of this application embodiment, different wavelength signals from the service information received from the first line optical fiber are transmitted to the corresponding first target unit through the corresponding transmission link by each first line multiplexing / demultiplexing unit, and the multiplexed wavelength signal transmitted by the user multiplexing / demultiplexing unit is transmitted to the first line optical fiber with the corresponding optical direction; the user multiplexing / demultiplexing unit demultiplexes the local add / drop service wavelength signals transmitted by the first line multiplexing / demultiplexing unit into a first single wavelength signal, and multiplexes the second single wavelength signal transmitted by the packet switching unit and transmits it to the corresponding first line multiplexing / demultiplexing unit; the packet switching unit adjusts the optical direction by sending the received first single wavelength signal to the corresponding target client, or by sending the first single wavelength signal as the second single wavelength signal to the corresponding user multiplexing / demultiplexing unit, and sends the second single wavelength signal corresponding to the client service information to the corresponding user multiplexing / demultiplexing unit to select the optical direction of the client wavelength. This application eliminates the optical switching-based uplink and downlink service units and uses an electrical switching-based packet switching unit to achieve optical direction selection for service uplink and downlink. This reduces resource waste caused by functional overlap between components. Furthermore, since the electrical switching-based packet switching unit has far more ports than the uplink and downlink service units, it can improve scalability and is beneficial for adapting to multi-site interconnection scenarios.

[0063] It should also be noted that in scenarios with low bandwidth requirements, the wavelength switching unit can be removed, and only the packet switching unit can be retained. For example... Figure 10 As shown in the embodiments of this application, an optoelectronic converged switching system is also provided. This system includes multiple multiplexing / demultiplexing units and packet switching units, each of which is connected to a packet switching unit. The multiplexing / demultiplexing units are used to multiplex and demultiplex the wavelength signals corresponding to service information. On the receiving side, the multiplexing / demultiplexing unit receives the service information from the optical fiber and demultiplexes the wavelength signals corresponding to this service information into single-wavelength signals, which are then sent to the packet switching unit. On the transmitting side, the multiplexing / demultiplexing unit receives the single-wavelength signals sent by the packet switching unit, multiplexes them, and sends them to the corresponding optical fiber.

[0064] The packet switching unit is primarily used to perform optical direction selection for uplink and downlink services, bandwidth aggregation, and signal regeneration. For uplink services, the packet switching unit receives the uplink and downlink services sent by the client and transmits the wavelength signal corresponding to the service information to a designated line-side port. This line-side port is connected to a multiplexing / demultiplexing unit for a specific optical direction, thereby achieving optical direction selection. For downlink services, the packet switching unit receives a single-wavelength signal from the multiplexing / demultiplexing unit and transmits this single-wavelength signal to a designated user-side port, thus sending the service to the corresponding client equipment.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0066] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A photoelectric fusion switching system, characterized in that, include: The system comprises multiple first-line multiplexing / demultiplexing units, multiple user multiplexing / demultiplexing units, and a packet switching unit. Each first-line multiplexing / demultiplexing unit corresponds to a first-line optical fiber with a different optical direction. The first-line multiplexing / demultiplexing units are interconnected in pairs. Each first-line multiplexing / demultiplexing unit is connected to each user multiplexing / demultiplexing unit in a one-to-one correspondence. Each user multiplexing / demultiplexing unit is connected to the packet switching unit. Wherein: The first line multiplexing / demultiplexing unit is used to transmit different wavelength signals from the service information received from the first line optical fiber to the corresponding first target unit through the corresponding transmission link; and to transmit the multiplexed wavelength signal transmitted by the user multiplexing / demultiplexing unit to the first line optical fiber in the corresponding optical direction. The user multiplexing / demultiplexing unit is used to demultiplex the local add / drop service wavelength signals transmitted by the first line multiplexing / demultiplexing unit into a first single-wavelength signal; and to multiplex the second single-wavelength signal transmitted by the packet switching unit and transmit it to the corresponding first line multiplexing / demultiplexing unit. The packet switching unit is used to send the received first single-wavelength signal to the corresponding target client or to send the first single-wavelength signal as a second single-wavelength signal to the corresponding user multiplexing / demultiplexing unit; it is also used to send the second single-wavelength signal corresponding to the client service information to the corresponding user multiplexing / demultiplexing unit.

2. The optoelectronic fusion switching system according to claim 1, characterized in that, The packet switching unit has a gray light module on the port used to receive client service information, and a colored light module on the port corresponding to at least one user multiplexing / demultiplexing unit. The packet switching unit is connected to the corresponding user multiplexing / demultiplexing unit through the colored light module of the corresponding port.

3. The optoelectronic fusion switching system according to claim 2, characterized in that, The packet switching unit has a gray light module on the port corresponding to at least one user multiplexing / demultiplexing unit. The system also includes an optical wavelength conversion unit, and the gray light module is connected to the corresponding user multiplexing / demultiplexing unit through the optical wavelength conversion unit.

4. The optoelectronic fusion switching system according to claim 1, characterized in that, The transmission of different wavelength signals from the service information received from the first optical fiber to the corresponding first target unit via the corresponding transmission link includes: For different wavelength signals in the service information received from the first optical fiber, a first target transmission link corresponding to the wavelength signal is determined according to the transmission link pre-set for each wavelength signal, and the wavelength signal is transmitted to the corresponding first target unit through the first target transmission link; wherein, the first target unit is another first line multiplexing / demultiplexing unit or the corresponding user multiplexing / demultiplexing unit.

5. The optoelectronic fusion switching system according to claim 4, characterized in that, The packet switching unit is specifically used for: Based on the port receiving the first single-wavelength signal and in conjunction with the pre-established correspondence between ports, a first target port corresponding to the port receiving the first single-wavelength signal is determined, and the first single-wavelength signal is sent to the first target port; wherein, if the first target port is a client port connected to a client, it is sent to the corresponding target client; if the first target port is a port connected to another user multiplexing / demultiplexing unit, the first single-wavelength signal is sent as a second single-wavelength signal to the corresponding user multiplexing / demultiplexing unit. Based on the port where the client service information is received, and in conjunction with the pre-established correspondence between ports, a second target port corresponding to the port where the client service information is received is determined, and a second single-wavelength signal corresponding to the client service information is sent to the corresponding user multiplexing / demultiplexing unit through the second target port.

6. The optoelectronic fusion switching system according to claim 5, characterized in that, There are multiple packet switching units, and any one of the packet switching units is connected to each of the user multiplexing / demultiplexing units.

7. The optoelectronic fusion switching system according to any one of claims 1 to 6, characterized in that, Also includes: An air-division switching unit is connected to a second-line optical fiber in multiple optical directions, and the air-division switching unit is connected to a corresponding first-line multiplexing / splitting unit through each of the first-line optical fibers. The space-division switching unit is used to determine, for each of the second line optical fibers, the optical fiber path corresponding to the service signal received through the second line optical fiber, based on the second line optical fiber and the pre-established correspondence between line optical fibers, and to send the wavelength signal in the service signal to the corresponding target line optical fiber based on the optical fiber path.

8. The optoelectronic fusion switching system according to claim 7, characterized in that, The first line multiplexing / splitting unit is a first wavelength selection switch or a first arrayed waveguide grating; and / or, the user multiplexing / splitting unit is a second wavelength selection switch or a second arrayed waveguide grating.

9. The optoelectronic fusion switching system according to claim 7, characterized in that, The space-division switching unit is a matrix optical switch based on a microelectromechanical system.

10. The optoelectronic fusion switching system according to claim 1, characterized in that, It also includes multiple second line multiplexing and demultiplexing units, each second line multiplexing and demultiplexing unit corresponds to a third line light beam with a different optical direction, the optical direction of the third line light beam is different from the optical direction of each first line light beam, any two line multiplexing and demultiplexing units between each second line multiplexing and demultiplexing unit and each first line multiplexing and demultiplexing unit are interconnected, and each second line multiplexing and demultiplexing unit is connected to the corresponding port of the packet switching unit. The second line multiplexing / demultiplexing unit is used to determine the second target transmission link corresponding to the wavelength signal based on the transmission links pre-set for different wavelength signals in the service information received from the third line optical fiber, and transmit the wavelength signal to the corresponding second target unit through the second target transmission link; wherein, the second target unit is another first line multiplexing / demultiplexing unit or another second line multiplexing / demultiplexing unit or the packet switching unit.

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