An optical interconnection network system based on WDM optical and electrical hybrid

Abstract

The present invention discloses an optical interconnection network system based on WDM optical and electrical hybrid. The received optical signal is demultiplexed into two parts through an optical receiving port. One path of the optical signal is transmitted to an electrical switching control module, converted into a digital electrical signal through optoelectronic conversion for processing, and then converted back into an optical signal through electro-optical conversion after processing. The remaining optical signal is transmitted to an optical switching control module for wavelength switching through an optical switch. The configuration of the optical switch is determined by a routing configuration register in a local resource module. The routing configuration register reads a routing configuration data packet in the electrical switching control module, reads the configuration information in the data packet for routing configuration, and then the optical transmitting port multiplexes multiple optical signals into one optical signal again through wavelength division multiplexing technology for transmission.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical communication. More specifically, it relates to an optical interconnection network system based on WDM optoelectronic hybrid. Background Art

[0002] In recent years, with the development of communication networks, the data volume of communication networks has been continuously increasing, and high-speed data transmission systems have become the development trend of communication networks. From the perspective of the transmission medium of communication networks, most traditional communication networks are based on dielectric transmission. From the perspective of the communication network architecture, most traditional communication networks are based on network architectures such as bus type and star type. This network structure is simple and easy to use, but it has the characteristics of poor scalability, low transmission capacity, slow transmission speed, and easy interference, which is not conducive to the development of current communication technologies.

[0003] Abroad, in the 1980s, it was proposed to use optical fiber as the transmission medium. Compared with traditional cable media, optical fiber not only has good anti-electromagnetic interference performance, but also has the characteristics of long transmission distance and large signal bandwidth. At the same time, the maturity of optical transmission technology, especially the Wavelength Division Multiplexing (WDM) technology, enables multiple data links to be integrated onto a single optical fiber for transmission, which can significantly increase the channel capacity. However, due to current technologies, it is impossible to store light, and it is impossible to perform operations such as routing and switching and signal regeneration as simply as electrical transmission, which restricts the development of optical interconnection networks.

[0004] Regarding the switching schemes in optical interconnection, currently, three main switching schemes are mainly adopted: electrical switching, optical splitter, and optical switching. Among them, in the electrical switching scheme, the node connection links use wavelength-division multiplexing optical fiber transmission. After wavelength demultiplexing and optoelectronic conversion inside the node, an electronic switching chip is used for port switching of data. After electro-optical conversion, it is output through a wavelength-division multiplexer. The electrical switching scheme has the advantages of mature technology, simple implementation, and flexible operation, etc. However, it also introduces an optoelectronic conversion process, which increases the delay. As the network scale increases and the number of nodes increases, the total delay increases. In the optical splitter scheme, all signals are broadcast to each node through an optical passive device (optical splitter), and each node selects the signals belonging to this node by itself. At the same time, the optical splitter (reverse optical transmission) functions as an optical coupler to realize the multiplexing function of multiple signals, realizing optical broadcast and multicast functions, and is simple and easy to implement; however, once the optical splitter is set, it is difficult to change the configuration, resulting in a fixed connection method and an inflexible network. At the same time, due to the broadcast of the optical splitter, the optical power will decrease. In the case of no optical amplifier, the network scale is limited. In the optical switching scheme, based on the node scheme of optical switching, an optical switching chip is used to directly and controllably connect the optical signals between the node ports without optoelectronic conversion, which can solve the problems of large delay in electrical switching and non-adjustability of optical splitters. Through optical switching, the optical signal is directly connected to the corresponding output port, and the delay of passing through the node is the transmission delay, which can be ignored. Optical switching can configure the port connection relationship through control signals, avoiding the problem of fixed connection relationship of optical splitters. The signals input from each port are demultiplexed by a wavelength demultiplexer into different wavelengths, and then the port connection relationship of each wavelength is realized through an optical switching chip. After the switching is completed, each wavelength is multiplexed by a wavelength-division multiplexer and then output from the port. This scheme has the advantages of small delay, no need for conversion during transmission, and can realize different switching scenarios through the configuration of optical chips. However, currently, optical chips mainly realize optical port switching, do not support broadcast and multicast functions, and at the same time, the wavelength-division multiplexer, optical switching chip, and optical interface inevitably cause optical power loss, resulting in a decrease in optical power every time a node is passed through. In the case of no optical amplifier, the number of transmission nodes and the network scale are limited. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an optical interconnection network system based on WDM optoelectronic hybrid, which uses WDM technology to realize single-fiber multi-wavelength optical interconnection data transmission, improve the communication link bandwidth, reduce communication interference, and improve the communication rate; use optical switching technology to realize cross-switching of multiple optical ports, improve the communication efficiency of the network; and solve the problems of inability to store, broadcast, and difficult multicast in optical switching through optoelectronic hybrid technology.

[0006] To achieve the above-mentioned invention objective, an optical interconnection network system based on WDM optical and electrical hybrid of the present invention is characterized by comprising: an electrical switching control module, a local resource module, and an optical switching control module that connect an optical receiving port supporting wavelength division multiplexing and an optical transmitting port supporting wavelength division multiplexing;

[0007] The optical receiving port is used to receive an optical signal containing N wavelengths. Each optical receiving port demultiplexes the optical signal into N wavelength signals. One wavelength signal is sent to the electrical switching control module, and the remaining N - 1 groups of wavelength signals are sent to the optical switching control module;

[0008] The electrical switching control module includes an optoelectronic conversion module, a task module, a resource scheduling module, and an electro-optical conversion module;

[0009] Each optoelectronic conversion module receives the optical signal sent by the corresponding optical receiving port, converts it into an electrical signal, and then transmits it to the corresponding task module in the form of a data frame. The task module reads the destination node ID in the data frame, and then determines whether the destination node ID is the same as the node ID stored in the node basic information register in the local resource module. If they are the same, the local acceptance of the data frame is started. If they are not the same, the data frame is directly forwarded;

[0010] When the task module forwards the data frame, the task module does not process the data frame, and the data frame is directly forwarded to the resource scheduling module;

[0011] When the task module starts to locally accept the data frame, the task module first reads the command word in the data frame, and then performs corresponding response processing according to the instruction in the command word:

[0012] If the instruction in the command word is a status query instruction, the task module queries according to the object to be queried and the query condition in the instruction, then uses the query result as the data part, sets the local node ID as the source address, sets the node ID that issued the query instruction as the destination address, and then forms a new data frame after adding a new frame header and a function instruction, and sends it to the resource scheduling module;

[0013] If the instruction in the command word is a data configuration instruction, the task module reads the data part in the data frame, and then configures the data part to the object to be configured in the instruction. After the configuration is completed, the local node ID is set as the source address, the node ID that issued the configuration instruction is set as the destination address, and then a new data frame is formed after adding a new frame header and a function instruction, and sent to the resource scheduling module;

[0014] The resource scheduling module receives each data frame, then reads the function instructions of each data frame, extracts the weights in the function instructions and the port numbers of the data frame sources, and schedules each data frame to the corresponding output port in the order of weight priority and port polling. Then, it is converted into an optical signal through the electro-optical conversion module of the corresponding port and transmitted to the optical transmission port;

[0015] The optical switching control module consists of N - 1 groups of optical switches and is used to complete the wavelength switching of the remaining N - 1 groups of wavelength signals in the optical receiving port; according to the different wavelengths of the remaining N - 1 groups of wavelength signals, optical signals of different wavelengths are respectively transmitted to the optical switches corresponding to the wavelengths, and then the port switching modes of each group of optical switches are configured through the data in the routing configuration register in the local resource module, and the connection relationship corresponding to the input port and the output port is allocated according to the configuration result. Finally, the switched optical signal is transmitted to the optical transmission port through the optical switch;

[0016] The optical transmission port multiplexes the N groups of wavelength signals into one group of optical signals and sends them.

[0017] The invention purpose of the present invention is realized as follows:

[0018] A WDM electro-optical hybrid-based optical interconnection network system of the present invention demultiplexes the received optical signal into two parts through the optical receiving port. One path of the optical signal is transmitted to the electrical switching control module, processed by electro-optical conversion into a digital electrical signal, and then converted into an optical signal through electro-optical conversion after processing; the remaining optical signal is transmitted to the optical switching control module for wavelength switching through the optical switch; the configuration of the optical switch is determined by the routing configuration register in the local resource module; the routing configuration register reads the routing configuration data packet in the electrical switching control module, reads the configuration information in the data packet for routing configuration, and then the optical transmission port multiplexes the multiple optical signals into one optical signal through wavelength division multiplexing technology for transmission again.

[0019] Meanwhile, a WDM electro-optical hybrid-based optical interconnection network system of the present invention also has the following beneficial effects:

[0020] (1) The present invention realizes the transmission of single-fiber multi-wavelength optical signals through the use of WDM technology, improves the communication bandwidth, and reduces the communication delay.

[0021] (2) The node uses an optical switch for optical switching, with small delay and no need for conversion during transmission. Different switching scenarios can be realized through the configuration of the optical chip.

[0022] (3) The present invention uses electro-optical conversion technology to solve the problems that optical signals cannot be stored in traditional optical networks and multicast and broadcast are difficult in optical switching, and improves the communication and control efficiency between nodes.

[0023] (4) The node structure can be adjusted according to different network scales and network requirements, making the network combination more flexible. At the same time, the same node design is used in the network. When a node fails, the network node can be directly replaced, simplifying the maintenance process and further improving the network performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the schematic diagram of the wavelength routing principle of the node;

[0025] Figure 2 is the architecture diagram of a specific implementation manner of the optical interconnection network system based on WDM optical and electrical hybrid of the present invention;

[0026] Figure 3 is the schematic diagram of the structure of the electrical switching control module;

[0027] Figure 4 is the schematic diagram of the structure of the resource scheduling module;

[0028] Figure 5 is the schematic diagram of the structure of the local resource module;

[0029] Figure 6 is the schematic diagram of the structure of the optical switching control module;

[0030] Figure 7 is the schematic diagram of the ports at the optical transmission layer of the node. DETAILED DESCRIPTION OF THE INVENTION

[0031] The following describes the specific implementation manner of the present invention with reference to the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be particularly noted that in the following description, when the detailed description of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0032] Embodiment

[0033] Figure 2 is the architecture diagram of a specific implementation manner of the optical interconnection network system based on WDM optical and electrical hybrid of the present invention.

[0034] In the operation of the optical interconnection network, the working signals are divided into two types. One is the control signal of the network. The characteristics of this type of signal are small data volume, low sensitivity to delay, short transmission distance, but there are requirements for broadcasting and multicasting. The other is the message signal with a large data volume. The characteristics of this type of signal are large data volume and high sensitivity to delay.

[0035] For signals with a large amount of data, a wavelength routing method is adopted to connect each node in the interconnected network. In the wavelength routing scheme, a node needs to support wavelength switching between multiple ports, and for each wavelength, there is an independent connection requirement for input and output ports. Therefore, each wavelength is regarded as a switching plane, and an optical switch is used to meet the port switching connection requirements of the wavelength plane, as Figure 1 shown, the switching of each wavelength plane is independent of each other.

[0036] In this embodiment, as Figure 2 shown, taking 4-wavelength wavelength division multiplexing as an example, there are 4 groups of optical transmission ports and optical reception ports in the figure. An electrical switching control module, a local resource module, and an optical switching control module are connected between the optical transmission port and the optical reception port;

[0037] The optical reception port is used to receive an optical signal containing 4 wavelengths (λ 1 ~λ 4 ). Each optical reception port demultiplexes the optical signal into 4 wavelength signals. One of the wavelengths, λ 1 signal, is sent to the electrical switching control module, and the remaining 3 groups of wavelength signals are sent to the optical switching control module;

[0038] The electrical switching control module includes an optoelectronic conversion module, a task module, a resource scheduling module, and an electro-optical conversion module. As Figure 3 shown, in this embodiment, the optoelectronic conversion module, the task module, and the electro-optical conversion module are consistent with the number of optical transmission ports and optical reception ports, so that each port has a separate task module for task processing;

[0039] Each optoelectronic conversion module receives the optical signal sent by the corresponding optical reception port, converts it into an electrical signal, and then transmits it to the corresponding task module in the form of a data frame. The frame structure of the data frame is: frame header (64bit) + data part (N×8bit); the specific structure of the frame header is: source node ID (8bit) + destination node ID (8bit) + frame length (16bit) + command word (16bit) + function instruction (16bit).

[0040] The task processing of the task module is mainly divided into two types: locally receiving the data frame and forwarding the data frame. Therefore, after each task module receives the data frame, it first reads the destination node ID in the data frame, and then judges whether the destination node ID is the same as the node ID stored in the node basic information register of the local resource module. If they are the same, the local reception of the data frame is started. If they are not the same, the data frame is directly forwarded;

[0041] When the task module forwards the data frame, the task module does not process the data frame, and the data frame is directly forwarded to the resource scheduling module for further processing;

[0042] When the task module starts to locally receive a data frame, the task module first reads the command word in the data frame, and then performs corresponding response processing according to the instruction in the command word:

[0043] If the instruction in the command word is a status query instruction, the task module queries according to the object to be queried and the query conditions in the instruction. The objects to be queried are each node in the network model, and the query conditions are specifically as follows: node status query, node routing configuration query, adjacent node periodic wave hand, etc. Then, the query result is used as the data part, the local node ID is set as the source address, the node ID that issues the query instruction is set as the destination address, and after adding a new frame header and a function instruction, a new data frame is formed and sent to the resource scheduling module;

[0044] If the instruction in the command word is a data configuration instruction, the task module reads the data part in the data frame, and then configures the data part to the object to be configured in the instruction. After the configuration is completed, the local node ID is set as the source address, the node ID that issues the configuration instruction is set as the destination address, and after adding a new frame header and a function instruction, a new data frame is formed and sent to the resource scheduling module;

[0045] As Figure 4 shown, the resource scheduling module receives each data frame and caches it in a first-in, first-out mode. Then, it reads the function instruction of each data frame, extracts the weight value in the function instruction and the port number of the data frame source, and schedules each data frame to the corresponding output port in the order of weight priority and port polling. Then, it is converted into an optical signal through the electro-optical conversion module of the corresponding port and transmitted to the optical transmission port;

[0046] In this embodiment, we combine Figure 2 , taking 4-wavelength wavelength division multiplexing as an example, to describe the process of scheduling multiple data frames:

[0047] (1), Multi-port data scheduling;

[0048] Each task sub-module caches the received data frames in a first-in, first-out mode, then reads the function instruction in the data frame, extracts the weight value and arranges it in descending order, and finally schedules the data frame with the largest weight value in the cache to the output port in the order of weight priority; for data frames with the same weight value, they are scheduled to the data frame with the largest current weight value in ascending order of port number in turn;

[0049] (2), Select the output port

[0050] Set the coordinates of the two-dimensional position where the current node is located as (X 1 , Y 1 ), and the coordinates of the two-dimensional position where the destination node is located as (X 2 , Y2 ); First, judge the X direction. When X 1 > X 2 , select port 4 as the output port; when X 1 <X 2 , select port 2 as the output port; when X 1 =X 2 , continue to judge the Y direction. When Y 1 > Y 2 , select port 3 as the output port; when Y 1 <Y 2 , select port 1 as the output port; when Y 1 =Y 2 , at this time, the current node is the destination node, and the process ends.

[0051] As Figure 5 shown, the local resource module is provided with a node basic information register storing the node ID and a routing configuration register storing routing configuration information;

[0052] As Figure 6 shown, the optical switching control module consists of 3 groups of optical switches, which are used to complete the wavelength switching of 3 groups of wavelength (λ 2 ~λ 4 ) signals in the optical receiving ports; the remaining 3 groups of wavelength signals, according to the different wavelengths, respectively send optical signals of different wavelengths to the optical switches corresponding to the wavelengths, and then perform routing configuration on the port switching modes of each group of optical switches through the routing configuration information in the routing configuration register in the local resource module, and allocate the connection relationship corresponding one-to-one between the input port and the output port according to the configuration result. Finally, the switched optical signals are sent to the optical sending port through the optical switch;

[0053] In this embodiment, taking the 4-wavelength wavelength division multiplexing shown in Figure 2 as an example, each node needs to support the wavelength switching of 4 ports. As Figure 7 shown, they are port 1 (upward direction), port 2 (right direction), port 3 (downward direction), and port 4 (left direction) respectively. The input optical fibers of the 4 interconnected ports first pass through the wavelength demultiplexer to separate each wavelength signal, and then connect the wavelength signals with the same wavelength at the 4 input ports to the input end of a 4×4 optical switch. The 4 output ends of the 4×4 optical switch are respectively connected to the wavelength multiplexers of the 4 output ports. Through the configuration in the local resource module, the switching state of each optical switch can be changed to achieve different port switching configurations.

[0054] Finally, the optical sending port multiplexes the 4 groups of wavelength signals into a group of optical signals and sends them.

[0055] Although the above description of the illustrative embodiments of the present invention has been made to facilitate the understanding of those skilled in the art of the present technology, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection.

Claims

1. An optical interconnection network system based on WDM optical and electrical hybrid, characterized in that, it includes: an electrical switching control module, a local resource module and an optical switching control module that connect an optical receiving port supporting wavelength division multiplexing and an optical transmitting port supporting wavelength division multiplexing; the optical receiving port is used to receive an optical signal containing N wavelengths, and each optical receiving port demultiplexes the optical signal into N wavelength signals, one of the wavelength signals is sent to the electrical switching control module, and the remaining N-1 groups of wavelength signals are sent to the optical switching control module; the electrical switching control module includes an optoelectronic conversion module, a task module, a resource scheduling module and an electro-optical conversion module; each optoelectronic conversion module receives the optical signal sent by the corresponding optical receiving port, converts it into an electrical signal, and then transmits it to the corresponding task module in the form of a data frame. The task module reads the destination node ID in the data frame, and then judges whether the destination node ID is the same as the node ID stored in the node basic information register in the local resource module. If they are the same, the local acceptance of the data frame is started. If they are not the same, the data frame is directly forwarded; when the task module forwards the data frame, the task module does not process the data frame, and the data frame is directly forwarded to the resource scheduling module; when the task module starts to locally accept the data frame, the task module first reads the command word in the data frame, and then performs corresponding response processing according to the instruction in the command word: if the instruction in the command word is a status query instruction, the task module queries according to the object to be queried and the query conditions in the instruction, then takes the query result as the data part, sets the local node ID as the source address, sets the node ID of the node that issued the query instruction as the destination address, and then adds a new frame header and a function instruction to form a new data frame, and sends it to the resource scheduling module; if the instruction in the command word is a data configuration instruction, the task module reads the data part in the data frame, then configures the data part to the object to be configured in the instruction. After the configuration is completed, the local node ID is set as the source address, the node ID of the node that issued the configuration instruction is set as the destination address, and then a new frame header and a function instruction are added to form a new data frame and sent to the resource scheduling module; the resource scheduling module receives each data frame, then reads the function instruction of each data frame, extracts the weight value in the function instruction and the port number of the data frame source, and schedules each data frame to the corresponding output port in the order of weight priority and port polling, and then converts it into an optical signal through the electro-optical conversion module of the corresponding port and transmits it to the optical transmitting port; the optical switching control module consists of N-1 groups of optical switches, which are used to complete the wavelength switching of the remaining N-1 groups of wavelength signals in the optical receiving port; according to the different wavelengths, the remaining N-1 groups of wavelength signals respectively send optical signals of different wavelengths to the optical switches corresponding to the wavelengths, and then route-configure the port switching modes of each group of optical switches according to the routing configuration information in the routing configuration register in the local resource module, and allocate the connection relationship corresponding to the input port and the output port according to the configuration result. Finally, the switched optical signal is sent to the optical transmitting port through the optical switch; The optical transmission port multiplexes N groups of wavelength signals into a group of optical signals and transmits them.

2. The optical interconnection network system based on WDM optical and electrical hybrid according to claim 1, characterized in that the frame structure of the data frame is: frame header + data part; wherein, the specific structure of the frame header is: source node ID + destination node ID + frame length + command word + function instruction.

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