Modularized optical cross transmission system for novel DC interconnection

Abstract

The invention relates to the technical field of optical communication, in particular to a modularized optical cross transmission system for novel DC interconnection, which comprises system signal design, system function modularized design, POB BOX design, product function design and cascading POB BOX design. According to the system, the depth of a 1000 or 1200 deep cabinet of a DC machine room is better utilized, partitioning is carried out according to functions, FULL modular design is adopted, public sub-frame slot density is low, sub-frames are cascaded according to service development conditions, and the service fault radius can be reduced; according to the transmission system, function partition modules can be configured according to needs, the slot position utilization rate is higher, the front-in rear-out and physical size digital design is adopted, the data center machine room is matched from the integration level, the power consumption and the air channel requirements, and compared with traditional equipment, the no-load power consumption is reduced by 40% or above.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to a modular optical cross transmission system for novel DC interconnection. Background Art

[0002] DC interconnection refers to directly connecting the enterprise data center and the cloud service provider's network through a dedicated physical line to achieve data center interconnection. This connection method is usually used to build a safer, more reliable, and higher-bandwidth network connection. The traditional DC egress router needs to interoperate with multiple local telecom operators' Internet core equipment in order to meet the DC data egress bandwidth requirements. The bandwidth of the intercommunication circuit is generally large, which can be solved by using dense wavelength division system technology. The OTM back-to-back networking method is selected. This solution is relatively mature and has been used in operator networks for many years, with rich operation and maintenance experience.

[0003] The business model of the new DC has changed from traditional cabinet leasing, storage sales, and business hosting to value-added services such as computing power sales and storage-computing integration. This is different from the traditional data center which mainly relies on north-south traffic. The new DC has greatly increased east-west horizontal traffic and has lower requirements for circuit latency to ensure the experience of computing power services. The traditional dense wavelength division system equipment is full-scenario, that is, it has large-capacity optical and electrical switching capabilities to meet the capacity requirements of various scenarios from trunk lines to metropolitan areas. However, the new data center era should be built with DC as the center of the transmission network, and the DCization of communication rooms is the future trend. In the new scenario, some shortcomings of traditional wavelength division equipment are revealed.

[0004] The typical solution for DC interconnection is based on DWDM technology and uses large-capacity traditional OTM, ROADM and other types of equipment to form a network, which has the following problems:

[0005] Large fault radius: Mainstream dense wavelength division equipment usually supports single-slot 100G, 200G, or even 400G access capabilities. Through calculation, it can be concluded that the larger the single-slot access capacity, the larger the service fault radius. The fewer the number of standard cabinets, the lower the DC outbound traffic. It can also be concluded that the smaller the scale of the standard cabinets in the data center, the larger the fault radius;

[0006] The air duct design is inconsistent with the DC environment: The airflow organization of the communication room (CT room) adopts the "flooding" method, which is a relatively extensive cooling management method. The airflow organization of traditional dense wavelength division equipment is "front-to-front" or "front-to-top" to facilitate the back-to-back and face-to-face installation of cabinets. Whether the new DC adopts the air supply / upper return method under the raised floor or the front air supply / rear return method of the inter-row cooling air conditioner, the cold and hot channel isolation measures are adopted. The equipment installed in the data center room is all rear-exhaust. Therefore, the airflow organization of traditional dense wavelength division equipment is inconsistent with the data center air duct design, affecting the overall airflow design;

[0007] The cabinet installation environment does not match: Due to the different layouts of the CT room and the DC room, the cabinet sizes are different. The depth of the traditional dense wavelength division equipment installation cabinet is shallow. Although it does not affect the installation in the deeper DC room cabinet, the vertical dimensions of the equipment sub-racks, boards and other devices are small, so the height dimension increases, occupying more upper and lower space;

[0008] Power supply mode mismatch: The conventional power supply mode of CT room is to set up DC branch cabinet in the CT room, lead DC from the power room of the telecommunications building, connect the transmission equipment cabinet to the DC branch cabinet, and use -48V DC power supply mode; In order to adapt to the heat dissipation of high-power equipment of IT equipment and the dual-carbon goals, high-voltage DC power supply and closed cold channel have become the new DC mainstream mode. The existing dense wavelength division equipment is still mainly based on dedicated DC converters, which increases the failure points, has management loopholes, and occupies the space of the room;

[0009] High energy consumption: Traditional dense wavelength division equipment has low integration, many slots, and large access capacity. For small and medium-sized DC equipment rooms, most of the equipment slots are vacant due to limited DC flow, resulting in unnecessary idling energy consumption. In addition, the "flooding" method of the existing CT equipment room has chaotic airflow organization and low efficiency, and cannot solve the problems of local hot spots and high-power cabinets. At present, traditional dense wavelength division equipment temporarily solves the problem of local hot spots by modifying the air ducts by adding side cabinets.

[0010] Based on the above new requirements, the new DC interconnection transmission system should have the advantages of flexible optical path access, fast service provisioning, functional modular design, open management and control, and meet the requirements of multiple optical path dimensions, low service latency, low PUE, and open decoupling. Summary of the invention

[0011] In view of the above-mentioned defects and problems, the present invention provides a modular optical cross-transmission system for new DC interconnection. Aiming at new DC interconnection scenarios and the trend of DCization of computer rooms, it adopts a modular design concept and has the characteristics of functional modularization, high integration, stackability, and expandable dimensions, which can effectively match new scenarios and reduce the fault radius.

[0012] The solution adopted by the present invention to solve the technical problem is: a modular optical cross transmission system for new DC interconnection, comprising:

[0013] System signal design: including the design of combined wave signal to single wave signal communication and the design of single wave signal to combined wave signal communication;

[0014] System function modular design: Based on signal processing logic, functional modular design is adopted to divide different partitions from the perspective of system safety and system function;

[0015] POB BOX design: POB BOX is prefabricated, with the optical fiber printed on a template. It has five conventional ports P1 to P5, which are connected to the wavelength selective switch using a multi-core jumper with an MT connector. Conventional ports P1 to P5 are interconnected, and a CP port is reserved as a cascade port with other POB BOXes.

[0016] Product function design: Based on the system function modular design scheme and POB BOX design scheme, the product function design of this system is formed;

[0017] Cascadable POB BOX design: Full modular design is adopted, including a backplane with all-optical connections. The POB BOX is divided into the MT interface on the front panel and the MT cascading interface on the rear panel. The MT interfaces are connected by prefabricated optical fibers.

[0018] Furthermore, the design method of the combined wave signal to single wave signal communication is as follows:

[0019] (1) The combined signal from the optical line side is amplified by the gain of the optical preamplifier and enters the optical wavelength selection switch on the line side. If the optical line side signal is configured with primary and backup protection, it is necessary to judge and select the received signal;

[0020] (2) The line-side optical wavelength selective switch adjusts the spatial phase of the incident light according to the information sent by the network management, and reflects different wavelengths to the corresponding ports. The N ports of the line-side wavelength selective switch are interconnected with other line-side wavelength selective switches and local wavelength selective switches;

[0021] (3) The combined signal entering the local wavelength selective switch enters the wavelength splitter after being combined and subjected to signal gain. According to the configuration information, the single-wavelength signals of different wavelengths enter different M ports, and are received by the wavelength conversion unit and converted into client signals.

[0022] Furthermore, the design method of the single-wave signal to combined-wave signal communication is as follows:

[0023] (1) The wavelength conversion unit receives the signal from the client-side device and converts it into a single-wavelength signal according to the command issued. The single-wavelength signals of different wavelengths enter the M ports of the combiner device and enter the wavelength selection switch on the local line side after combining and signal gain.

[0024] (2) The wavelength selective switch on the local line side adjusts the spatial phase of the incident light according to the information sent by the network management, and reflects different wavelengths to the corresponding ports. The N ports of the wavelength selective switch on the local line side are interconnected with all the wavelength selective switches on the optical line side;

[0025] (3) The wavelength selective switch on the optical line side combines the signals from all N directions and forwards them, which are then amplified by the optical preamplifier and enter the external optical fiber.

[0026] Furthermore, each partition module implements the following functions:

[0027] Area ①: mandatory function, realizing the line signal amplification and wavelength selection forwarding functions in the signal communication logic. In the area ①, the optical power amplifier unit, optical preamplifier unit, optical line protection unit, and line-side optical selection switch board of the main signal are placed to realize the receiving, sending and amplifying functions of the main signal;

[0028] Area ②: non-mandatory function, realizing the line signal amplification and signal selection reception functions in the "signal communication logic diagram". In the area ②, this area is configured only when the optical line protection unit is configured, and the optical power amplifier unit and optical preamplifier unit of the backup signal are placed. When the main signal reception fails, it can automatically switch to the backup signal. For the direction configured with main and backup protection, it is necessary to add area ②, and add an optical line protection unit in area ①;

[0029] Area ③: mandatory function, realizing the interconnection between the external line wavelength selection switch and the local line wavelength selection switch in the signal communication logic. In the area ③, at least one POB BOX is configured. The POB BOX is an optical passive device. Through the verification of the typical DC interconnection model, the port design of the POB BOX is divided into two types of ports: 5 and 10. When the POB BOX ports are insufficient, the POB BOXs with the same ports can be cascaded, but only one-time cascading is supported, which can be expanded to 10-port and 20-port POB BOXes;

[0030] Area ④: Required function, realizing the functions of local line wavelength selection, signal amplification, wavelength selection wave dropping, and optical wavelength conversion unit in signal communication logic. In the area ④, a local side N:M optical selective switch matrix is ​​placed, which is composed of an N:1 optical selective switch and a 1:M optical selective switch. The number of ports of N is 9 and 20, and the number of ports of M is 20 and 32. An optical wavelength converter is placed, and the optical wavelength converter is connected to the M ports of the optical selective switch matrix in area ④ with a single-mode pigtail.

[0031] Furthermore, a four-directional modular optical cross-transmission system is selected in the product function design, and four wavelength selection switch units need to be configured. To ensure the security of the service, two wavelength selection switch unit matrices are configured for the up and down of the service, that is, a total of six dimensions;

[0032] Furthermore, the six-dimensional modular transmission system is configured as follows:

[0033] Area ①: It consists of a common frame, optical amplifier units (receiver and transmitter) for main signals in each direction, and line-side wavelength selection switches;

[0034] Area ②: It consists of a common frame, optical amplifier units (receiving and transmitting) for backup signals in each direction, and an optical line protection unit;

[0035] Area ③: It consists of POB BOX and cascaded POB BOX. POB BOX adopts front and rear panel design. The front panel port is connected to the wavelength selection switch, and the rear panel port is cascaded with other POB BOX. The 5-port POB BOX has 3 cascade ports, which need to be connected one by one.

[0036] Area ④: consists of a common frame, a wavelength selection switch matrix, and a wavelength conversion unit.

[0037] Furthermore, the hardware of the modular optical cross-transmission system adopts a front-to-back airflow organization and can be installed in a standard cabinet.

[0038] Beneficial effects of the present invention:

[0039] Based on DC scenarios, equipment morphology is reconstructed to reduce the radius of business failures: This system makes better use of the depth of 1000 or 1200 deep cabinets in the DC room, partitions by function, adopts a full modular design, and has a low density of public sub-frame slots. Sub-frames can be cascaded according to business development conditions to reduce the radius of business failures.

[0040] Compared with traditional wavelength division equipment, the operating power consumption is lower: this transmission system can realize on-demand configuration of functional partition modules, with higher slot utilization, adopts front-to-back airflow and digital physical size design, and matches the data center room in terms of integration, power consumption and air duct requirements, reducing the no-load power consumption of traditional equipment by more than 40%;

[0041] Saving single-site construction investment: This transmission system adopts a modular design to achieve on-demand functional expansion. POB BOX can be flexibly cascaded to avoid the one-time construction of traditional equipment with many slots. The system uses universal optical devices with optoelectronic decoupling and open networking features, which can effectively avoid a single manufacturer controlling the network construction. It is estimated that it can save about 27% of the single-site construction investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a communication principle diagram of optical signal multiplexing signal to single wave signal;

[0043] Figure 2 It is the logic diagram of the system combined wave signal;

[0044] Figure 3 Divide the logic diagram for system functional partitions;

[0045] Figure 4 Design diagram for system functional zoning;

[0046] Figure 5 Design logic diagram for POB BOX functions;

[0047] Figure 6 It is a schematic diagram of the DC node connection in four line directions;

[0048] Figure 7 It is the communication logic diagram of the six-dimensional modular optical cross transmission system;

[0049] Figure 8 The diagram area ① is configured for the six-dimensional modular transmission system;

[0050] Fig. 9 The six-dimensional modular transmission system is configured in area ②;

[0051] Fig.10 Configuring the six-dimensional modular transmission system diagram area ③;

[0052] Fig.11 Area ④ is a diagram for configuring a six-dimensional modular transmission system;

[0053] Fig.12 It is a schematic diagram of the airflow organization method of the present invention;

[0054] Fig.13 It is a communication system diagram of a six-dimensional modular transmission system;

[0055] Fig.14 This is a schematic diagram of the internal port connections of the 5-port POB BOX. DETAILED DESCRIPTION

[0056] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0057] See also Figure 1-14 The present invention provides a transmission system and functional design scheme suitable for multi-directional access and DC node installation:

[0058] Embodiment 1:

[0059] A modular optical cross-connect transmission system for new DC interconnection, comprising:

[0060] 1. System signal design

[0061] 1. Combined wave signal to single wave signal communication

[0062] (1) The combined signal from the optical line side is amplified by the gain of the optical preamplifier and enters the optical wavelength selection switch on the line side. If the optical line side signal is configured with primary and backup protection, it is necessary to judge and select the received signal;

[0063] (2) The line-side optical wavelength selective switch adjusts the spatial phase of the incident light according to the information sent by the network management, and reflects different wavelengths to the corresponding ports (a maximum of N). The N ports of the line-side wavelength selective switch are interconnected with other line-side wavelength selective switches and local wavelength selective switches;

[0064] (3) The combined signal entering the local wavelength selective switch enters the wavelength splitter after being combined and subjected to signal gain. According to the configuration information, the single-wavelength signals of different wavelengths enter different M ports, and are received by the wavelength conversion unit and converted into client signals.

[0065] The communication principle of this transmission system from optical signal multiplexing signal to single wave signal is shown in Figure 1 shown.

[0066] 2. Single-wave signal to combined-wave signal communication

[0067] (1) The wavelength conversion unit receives the signal from the client-side device and converts it into a single-wavelength signal according to the command issued. The single-wavelength signals of different wavelengths enter the M ports of the combiner device and enter the wavelength selection switch on the local line side after combining and signal gain.

[0068] (2) The wavelength selective switch on the local line side adjusts the spatial phase of the incident light according to the information sent by the network management, and reflects different wavelengths to the corresponding ports (maximum N). The N ports of the wavelength selective switch on the local line side are interconnected with all the wavelength selective switches on the optical line side;

[0069] (3) The wavelength selective switch on the optical line side combines all N-directional signals and forwards them, which are amplified by the optical preamplifier and then enter the external optical fiber.

[0070] If the optical line side signal is configured with primary and backup protection, the signal will be sent in two directions.

[0071] The communication principle of the optical signal from single wave signal to combined wave signal in this transmission system is shown in Figure 2 shown.

[0072] 2. Modular design of system functions

[0073] Based on the above signal processing logic, a functional modular design is adopted. Taking the "system wave signal logic diagram" as an example, different partitions are divided from the perspectives of system safety and system functions.

[0074] according to Figure 3 The logic diagram of this system is as follows. All optical devices in this system are mainstream general-purpose devices. The system function design is as follows: Figure 4 As shown, each partition module implements the following functions:

[0075] Area ①: Required function, realizing line signal amplification, wavelength selection forwarding and other functions in the "Signal Communication Logic Diagram".

[0076] Place boards such as the optical power amplifier unit, optical preamplifier unit, optical line protection unit, and line-side optical selector switch for the main signal to realize the receiving, transmitting, and amplifying functions of the main signal. The line-side optical selector switch adopts mainstream universality and can be divided into two categories, namely 9 and 20, according to the dimension. The dimension selection of the line-side optical selector switch can be estimated according to the sum of the number of line directions and the number of local dimensions.

[0077] For the direction configured with active and standby protection, it is necessary to add area ② and add an optical line protection unit in area ①.

[0078] Area ②: Non-mandatory function, realizing functions such as line signal amplification and signal selection reception in the "Signal Communication Logic Diagram".

[0079] This area is configured only when the optical line protection unit is configured. Place boards such as the optical power amplifier unit and optical preamplifier unit of the backup signal. When the main signal reception fails, it can automatically switch to the backup signal.

[0080] Area ③: Mandatory function, realizing the interconnection between the external line wavelength selective switch and the local line wavelength selective switch in the "Signal Communication Logic Diagram".

[0081] At least one POB BOX must be configured. POB BOX is an optical passive device. Through DC interconnection typical model verification, the port design of POB BOX is divided into two types of ports, namely 5 and 10. When the POB BOX ports are insufficient, POB BOXs with the same ports can be cascaded, but only one-time cascading is supported, which can be expanded to 10-port and 20-port POB BOXes.

[0082] Area ④: Required, implements the local line wavelength selection, signal amplification, wavelength selection and wavelength reduction, optical wavelength conversion unit and other functions in the "Signal Communication Logic Diagram".

[0083] Place a local side N:M optical selective switch matrix, which is composed of an N:1 optical selective switch and a 1:M optical selective switch. The number of N ports is 9 and 20, and the number of M ports is 20 and 32. Place an optical wavelength converter, which is connected to the M ports of the area ④ optical selective switch matrix with single-mode pigtails.

[0084] 3. POB BOX Design

[0085] POB BOX is prefabricated by printing the optical fiber on the template. Take the 5-port POB BOX as an example, it has 5 regular ports P1~P5, which are connected to the wavelength selective switch using a multi-core jumper with an MT connector. The regular ports P1~P5 are connected to each other, and the CP port is reserved as a cascade port with other POB BOXes. n(P) is the number of ports of the POB BOX.

[0086] The number of cores of the MT connector is no more than 24. When the port has more than 24 cores, multiple connectors are used to connect them.

[0087] 4. Product Function Design

[0088] Based on the system function modular design and POB BOX design, the product function design of this system is formed. Here, a four-directional modular optical cross-transmission system is used as an example to illustrate the product function design:

[0089] The four-line transmission system needs to be configured with four wavelength selection switch units. To ensure the security of the service, two wavelength selection switch unit matrices are configured for the up and down of the service, that is, a total of six dimensions. The communication logic diagram of the six-dimensional modular optical cross transmission system is as follows: Figure 7 As shown, including:

[0090] Area ①: Figure 8 As shown, it consists of a common frame, optical amplification units (receiving and transmitting) for main signals in each direction, and a wavelength selection switch on the line side;

[0091] Area ②: Fig. 9 As shown, it consists of a common frame, optical amplification units (receiving and transmitting) for backup signals in each direction, and an optical line protection unit;

[0092] Area ③: Fig.10As shown, it consists of a POB BOX and a cascaded POB BOX. The POB BOX adopts a front and rear panel design. The front panel port is connected to the wavelength selection switch, and the rear panel port is cascaded with other POB BOXes. The 5-port POB BOX has 3 cascade ports, which need to be connected one by one.

[0093] Area ④: Fig.11 As shown, it consists of a common frame, a wavelength selection switch matrix, and a wavelength conversion unit. The selection of the wavelength conversion unit is determined by business requirements, and 100G and 400G boards can be configured.

[0094] The hardware of this modular optical cross-connect transmission system, such as Fig.12 As shown in the figure, it adopts the front-to-back airflow organization and can be installed in a 19-inch standard cabinet with a depth of 800mm or more. The communication system of the six-dimensional modular transmission system composed of the above hardware is as follows Fig.13 shown.

[0095] 5. Cascadable POB BOX Design

[0096] This system adopts FULL modular design, including the backplane with full optical connection. POB BOX is divided into MT interface on the front panel and MT cascade interface on the rear panel. MT interfaces are connected by prefabricated optical fiber. 5-port POB BOX has 3 cascade interfaces, and 10-port POB BOX has 9 cascade interfaces. Fig.14 This is a schematic diagram of the internal port connections of the 5-port POB BOX.

[0097] This modular optical cross-transmission system is designed for new DC interconnection scenarios and the trend of DCization of computer rooms. It adopts a modular concept and has the characteristics of functional modularization, high integration, stackability, and scalability, which can effectively match new scenarios and reduce the fault radius.

[0098] Embodiment 2:

[0099] On the basis of the first embodiment, the optical amplifier unit in the optical line direction of the modular optical cross-transmission system can be embedded in the external wavelength selection switch device. As an overall design, it can still meet the functional requirements of the solution of the present invention, and the hardware design is more integrated, but the size requirement of the optical device is smaller and the cost is higher.

[0100] The modular optical cross transmission system combines the local line and the local drop wave unit as a whole to design a wavelength selection switch matrix, and can also be designed separately as two optical devices, and the devices are connected by soft optical fiber.

[0101] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A modular optical cross-connect transmission system for novel DC interconnection, characterized in that: include: System signal design: including the design of combined wave signal to single wave signal communication and the design of single wave signal to combined wave signal communication; System function modular design: Based on signal processing logic, functional modular design is adopted to divide different partitions from the perspective of system safety and system function; POB BOX design: POB BOX is prefabricated, with the optical fiber printed on a template. It has five conventional ports P1 to P5, which are connected to the wavelength selective switch using a multi-core jumper with an MT connector. Conventional ports P1 to P5 are interconnected, and a CP port is reserved as a cascade port with other POB BOXes. Product function design: Based on the system function modular design scheme and POB BOX design scheme, the product function design of this system is formed; Cascadable POB BOX design: Full modular design is adopted, including a backplane with all-optical connections. The POB BOX is divided into the MT interface on the front panel and the MT cascading interface on the rear panel. The MT interfaces are connected by prefabricated optical fibers.

2. A modular optical cross-connect transmission system for novel DC interconnection according to claim 1, characterized in that: The design method of the combined wave signal to single wave signal communication is as follows: (1) The combined signal from the optical line side is amplified by the gain of the optical preamplifier and enters the optical wavelength selection switch on the line side. If the optical line side signal is configured with primary and backup protection, it is necessary to judge and select the received signal; (2) The line-side optical wavelength selective switch adjusts the spatial phase of the incident light according to the information sent by the network management, and reflects different wavelengths to the corresponding ports. The N ports of the line-side wavelength selective switch are interconnected with other line-side wavelength selective switches and local wavelength selective switches; (3) The combined signal entering the local wavelength selective switch enters the wavelength splitter after being combined and subjected to signal gain. According to the configuration information, the single-wavelength signals of different wavelengths enter different M ports, and are received by the wavelength conversion unit and converted into client signals.

3. A modular optical cross-connect transmission system for novel DC interconnection according to claim 1, characterized in that: The design method of the single-wave signal to combined-wave signal communication is as follows: (1) The wavelength conversion unit receives the signal from the client-side device and converts it into a single-wavelength signal according to the command issued. The single-wavelength signals of different wavelengths enter the M ports of the combiner device and enter the wavelength selection switch on the local line side after combining and signal gain. (2) The wavelength selective switch on the local line side adjusts the spatial phase of the incident light according to the information sent by the network management, and reflects different wavelengths to the corresponding ports. The N ports of the wavelength selective switch on the local line side are interconnected with all the wavelength selective switches on the optical line side; (3) The wavelength selective switch on the optical line side combines the signals from all N directions and forwards them, which are then amplified by the optical preamplifier and enter the external optical fiber.

4. A modular optical cross-connect transmission system for novel DC interconnection according to claim 1, characterized in that: The functions of each partition module are as follows: Area ①: mandatory function, realizing the line signal amplification and wavelength selection forwarding functions in the signal communication logic. In the area ①, the optical power amplifier unit, optical preamplifier unit, optical line protection unit, and line-side optical selection switch board of the main signal are placed to realize the receiving, sending and amplifying functions of the main signal; Area ②: non-mandatory function, realizing the line signal amplification and signal selection reception functions in the "signal communication logic diagram". In the area ②, this area is configured only when the optical line protection unit is configured, and the boards of the optical power amplifier unit and optical preamplifier unit of the backup signal are placed. When the main signal reception fails, it can automatically switch to the backup signal. For the direction configured with main and backup protection, it is necessary to add area ②, and add an optical line protection unit in area ①; Area ③: mandatory function, realizing the interconnection between the external line wavelength selection switch and the local line wavelength selection switch in the signal communication logic. In the area ③, at least one POB BOX is configured. The POB BOX is an optical passive device. Through the verification of the typical DC interconnection model, the port design of the POB BOX is divided into two types of ports: 5 and 10. When the POB BOX ports are insufficient, the POB BOXs with the same ports can be cascaded, but only one-time cascading is supported, which can be expanded to 10-port and 20-port POB BOXes; Area ④: Required function, realizing the functions of local line wavelength selection, signal amplification, wavelength selection wave dropping, and optical wavelength conversion unit in signal communication logic. In the area ④, a local side N:M optical selective switch matrix is ​​placed, which is composed of an N:1 optical selective switch and a 1:M optical selective switch. The number of ports of N is 9 and 20, and the number of ports of M is 20 and 32. An optical wavelength converter is placed, and the optical wavelength converter is connected to the M ports of the optical selective switch matrix in area ④ with a single-mode pigtail.

5. A modular optical cross-connect transmission system for novel DC interconnection according to claim 1, characterized in that: In the product function design, a four-directional modular optical cross-transmission system can be selected and configured with four wavelength selection switch units. To ensure the security of the service, two wavelength selection switch unit matrices are configured for the up and down of the service, that is, a total of six dimensions.

6. A modular optical cross-connect transmission system for novel DC interconnection according to claim 5, characterized in that: The six-dimensional modular transmission system is configured as follows: Area ①: It consists of a common frame, optical amplifier units (receiver and transmitter) for main signals in each direction, and line-side wavelength selection switches; Area ②: It consists of a common frame, optical amplifier units (receiving and transmitting) for backup signals in each direction, and an optical line protection unit; Area ③: It consists of POB BOX and cascaded POB BOX. POB BOX adopts front and rear panel design. The front panel port is connected to the wavelength selection switch, and the rear panel port is cascaded with other POB BOX. The 5-port POB BOX has 3 cascade ports, which need to be connected one by one. Area ④: consists of a common frame, a wavelength selection switch matrix, and a wavelength conversion unit.

7. A modular optical cross-connect transmission system for novel DC interconnection according to claim 1, characterized in that: The hardware of the modular optical cross-connect transmission system adopts a front-to-back airflow organization and can be installed in a standard cabinet.

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