Data transmission system and method based on wavelength division multiplexing passive optical network

Abstract

The embodiment of the invention discloses a data transmission system and method based on a wavelength division multiplexing passive optical network. A completely independent OLT port and a GPON OLT module are configured for each service type in an optical line terminal of a data transmission system to transmit corresponding service data according to specified uplink and downlink wavelengths, so that isolation of a physical port level is realized, and the risk of configuration crossing or misoperation caused by the fact that the service data share the OLT port is eliminated; and the operation and maintenance management clarity and the business boundary clarity are ensured. The multiplexer / demultiplexer and the ODN arranged in the data transmission system correspondingly realize multiplexing transmission of a plurality of wavelengths in the same optical fiber. In the ONU, uplink and downlink signals corresponding to different wavelengths are arranged, only uplink and downlink optical signals of corresponding service types are received by setting different BOSAs, and each user terminal connected with the BOSAs can only receive and transmit signals of corresponding wavelengths, so that physical isolation of data is realized on the premise of not remarkably increasing the construction cost of network infrastructures, and the service quality of the user terminal is improved. And the risk of cross-department data access or monitoring is effectively eliminated.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communications, and in particular, to a data transmission system and method based on a wavelength division multiplexing passive optical network. Background Art

[0002] With the continuous development of communication technologies and the increasing network demands of people, the construction of communication devices and communication networks based on optical communication has become the main direction of network infrastructure construction.

[0003] PON (Passive Optical Network) is a basic network architecture based on optical communication. It generally consists of an optical line terminal (OLT) installed at a central control station, an optical distribution network (ODN), and a batch of optical network units (ONUs) installed at user premises.

[0004] The inventors studied the operation details of existing PON-based optical communication networks in various application scenarios and found that the confidentiality requirements for different service data during transmission are also different in the same application scenario. Since the existing PON-based optical communication network uses grey light (the uplink and downlink signals respectively use a different wavelength and do not perform wavelength division multiplexing) as the carrier for data transmission, the data of different business departments can only share one signal transmission link for transmission, and there is a risk that different service data can be viewed across departments during transmission. To achieve physical isolation of data transmission for different business departments, multiple sets of optical communication networks need to be configured for different business departments to transmit data, resulting in high construction costs for network infrastructure and low utilization rate of data transmission capabilities. Summary of the Invention

[0005] The embodiments of the present invention provide a data transmission system and method based on a wavelength division multiplexing passive optical network, which solve the technical problems in the prior art that since the existing PON-based optical communication network uses grey light as the carrier for data transmission, the data of different business departments can only share one signal transmission link for transmission within a set of optical communication networks, and there is a risk that different service data can be viewed across departments during transmission. To achieve physical isolation of data transmission for different business departments, multiple sets of optical communication networks need to be configured for different business departments to transmit data, resulting in high construction costs for network infrastructure and low utilization rate of data transmission capabilities.

[0006] In a first aspect, the embodiments of the present invention provide a data transmission system based on a wavelength division multiplexing passive optical network. The data transmission system includes: An optical line terminal, comprising a plurality of GPON OLT modules, each of the GPON OLT modules being configured to transmit a downstream optical signal corresponding to a service type and receive an upstream optical signal, and the upstream optical signals and downstream optical signals of different service types corresponding to unique wavelengths respectively; A first multiplexer / demultiplexer, comprising a plurality of demultiplexing interfaces and a multiplexing interface, each of the demultiplexing interfaces being connected to one of the GPON OLT modules, the multiplexing interface being connected to a first interface of the ODN, the first multiplexer / demultiplexer being configured to synthesize a plurality of the downstream optical signals into a first mixed optical signal and then transmit the first mixed optical signal to the ODN; and to separate a second mixed optical signal into upstream optical signals corresponding to each of the service types and then transmit the upstream optical signals to the corresponding GPON OLT modules; The ODN, comprising a plurality of second interfaces, each of the second interfaces being connected to an ONU, the ODN being configured to transmit the first mixed optical signal to each of the ONUs, and to synthesize each of the third mixed optical signals into the second mixed optical signal and then transmit the second mixed optical signal to the first multiplexer / demultiplexer; The ONU is configured to separate, from the first mixed optical signal, a downstream optical signal corresponding to at least one of the service types, convert the downstream optical signal into a first electrical signal and transmit the first electrical signal to a corresponding user terminal; and to convert a second electrical signal corresponding to at least one of the service types uploaded by the user terminal into an upstream optical signal, synthesize the upstream optical signals into the third mixed optical signal and transmit the third mixed optical signal to the ODN.

[0007] Wherein, each of the ONUs comprises a first sub-network unit and a second sub-network unit; When the first sub-network unit is configured to perform signal transmission, it separates, from the first mixed optical signal, a downstream optical signal corresponding to at least one of the service types, converts the downstream optical signal into a first electrical signal and transmits the first electrical signal to a corresponding user terminal; and to convert a second electrical signal corresponding to at least one of the service types uploaded by the user terminal into an upstream optical signal, synthesize the upstream optical signals into the third mixed optical signal and transmit the third mixed optical signal to the ODN; When the second sub-network unit is configured to perform signal transmission, it separates, from the first mixed optical signal, a downstream optical signal corresponding to at least one of the service types, converts the downstream optical signal into a first electrical signal and transmits the first electrical signal to a corresponding user terminal; and to convert a second electrical signal corresponding to at least one of the service types uploaded by the user terminal into an upstream optical signal, synthesize the upstream optical signals into the third mixed optical signal and transmit the third mixed optical signal to the ODN; Only one of the first sub-network unit and the second sub-network unit performs signal transmission at the same time.

[0008] Wherein, the first sub-network unit includes a plurality of first BOSAs, and the second sub-network unit includes a plurality of second BOSAs. The plurality of first BOSAs are used to transmit optical signals corresponding to different service types; the plurality of second BOSAs are used to transmit optical signals corresponding to different service types.

[0009] Wherein, the ONU includes an upper housing, a lower housing and a plurality of circuit boards. The plurality of circuit boards are arranged in a cavity formed by the upper housing and the lower housing; each circuit board is used to carry a first BOSA and a second BOSA corresponding to the same service type, and the service types corresponding to each circuit board are different.

[0010] Wherein, the plurality of circuit boards are stacked.

[0011] Wherein, the ONU includes a main circuit board and a plurality of slave circuit boards. The main circuit board includes a plurality of main interfaces, and each slave circuit board includes a slave interface; each slave circuit board is used to carry BOSAs corresponding to different service types and is connected to the main circuit board through the slave interface and the main interface.

[0012] Wherein, the number of service types is three. The wavelengths of the upstream optical signals corresponding to the three service types are 1271nm, 1291nm and 1311nm respectively, and the wavelengths of the corresponding downstream optical signals are 1331nm, 1351nm and 1371nm respectively.

[0013] Wherein, the first multiplexer / demultiplexer includes three demultiplexing interfaces. The first multiplexer / demultiplexer is used to combine the downstream optical signals sent by the three GPON OLT modules into the first mixed optical signal, and to separate the second mixed optical signal into upstream optical signals corresponding to the three service types and transmit the three upstream optical signals to the receiving interfaces of the corresponding GPON OLTs respectively.

[0014] Wherein, each ONU includes a second multiplexer / demultiplexer. The second multiplexer / demultiplexer is used to separate the downstream optical signals corresponding to at least one of the service types from the first mixed optical signal and transmit the downstream optical signals to the corresponding BOSAs; and to combine the upstream optical signals transmitted by the BOSAs into the third mixed optical signal.

[0015] In a second aspect, an embodiment of the present invention provides a data transmission method based on a wavelength division multiplexing passive optical network. The data transmission method is applicable to the data transmission system based on the wavelength division multiplexing passive optical network described in any one of the foregoing, and includes: Each of the GPON OLT modules in the optical line terminal sends a downstream optical signal corresponding to a service type to the demultiplexing interface of the first optical combiner / splitter. After the first optical combiner / splitter combines multiple downstream optical signals into a first mixed optical signal, it transmits the first mixed optical signal to the ODN. The ODN transmits the first mixed optical signal to multiple ONUs. The ONU separates the downstream optical signal corresponding to at least one service type from the first mixed optical signal, converts the downstream optical signal into a first electrical signal and transmits it to the corresponding user terminal. After the ONU converts the second electrical signal corresponding to at least one service type uploaded by the user terminal into an upstream optical signal, it synthesizes the upstream optical signals into the third mixed optical signal and transmits it to the ODN. After the ODN synthesizes each third mixed optical signal into the second mixed optical signal, it transmits the second mixed optical signal to the first optical combiner / splitter. After the first optical combiner / splitter separates the second mixed optical signal into upstream optical signals corresponding to each service type, it transmits the upstream optical signals to the corresponding GPON OLT modules, and each GPON OLT module receives the corresponding upstream optical signal.

[0016] In summary, by configuring a completely independent OLT port and GPON OLT module for each service type in the optical line terminal of the data transmission system to transmit corresponding service data at specified upstream and downstream wavelengths, physical port-level isolation is achieved, eliminating the risk of configuration crossover or misoperation caused by sharing OLT ports for service data, and ensuring the clarity of operation and maintenance management and the clarity of service boundaries. The optical combiner / splitter and ODN set in the data transmission system correspondingly realize the multiplexed transmission of multiple wavelengths in the same optical fiber. For the upstream and downstream signals corresponding to different wavelengths in the ONU, by setting different BOSAs to only receive the upstream and downstream optical signals corresponding to the corresponding service type, each user terminal connected to the BOSA can only transmit and receive the corresponding wavelength signals, thus achieving physical data isolation without significantly increasing the cost of network infrastructure construction, and effectively eliminating the risk of cross-department data access or eavesdropping. Description of the Drawings

[0017] Figure 1 It is the overall architecture diagram of the data transmission system of the passive optical network based on wavelength division multiplexing provided by the embodiment of the present invention.

[0018] Figure 2 It is the three-dimensional structure diagram of the ONU of the data transmission system of the passive optical network based on wavelength division multiplexing provided by the embodiment of the present application.

[0019] Figure 3 It is the three-dimensional structure diagram of the ONU of the data transmission system of the passive optical network based on wavelength division multiplexing provided by the embodiment of the present application from another perspective.

[0020] Figure 4 Explosion diagram of an ONU of a data transmission system of a passive optical network based on wavelength division multiplexing provided by an embodiment of the present application.

[0021] Figure 5 For Figure 4 Partial enlarged view at position A in

[0022] Figure 6 Schematic structural diagram of an ONU of another data transmission system of a passive optical network based on wavelength division multiplexing provided by an embodiment of the present application.

[0023] Figure 7 Method flowchart of a data transmission method of a passive optical network based on wavelength division multiplexing provided by an embodiment of the present application. Detailed implementation manners

[0024] The following description and drawings fully illustrate the specific implementation manners of the present application so that those skilled in the art can practice them. The embodiments merely represent possible variations. Unless explicitly required, separate components and functions are optional, and the order of operations can vary. Parts and features of some embodiments can be included in or substituted for parts and features of other embodiments. The scope of the embodiments of the present application includes the entire scope of the claims and all available equivalents of the claims. In this document, the embodiments can be individually or collectively referred to by the term "invention" for convenience only, and if in fact more than one invention is disclosed, it is not intended to automatically limit the scope of the application to any single invention or inventive concept. In this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method or device comprising a series of elements includes not only those elements but also other elements not expressly listed. The various embodiments in this document are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the structures, products, etc. disclosed in the embodiments, since they correspond to the parts disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0025] As a basic network architecture based on optical communication, PON usually consists of an optical line terminal installed at a central control station and a batch of ONUs installed at user premises in a supporting manner.

[0026] The inventor studied the operation details of using the existing PON-based optical communication network in various application scenarios and found that the confidentiality requirements for different service data during transmission are also different in the same application scenario. There is a risk that the transmission of different service data in the existing PON-based optical communication network can be viewed by irrelevant service departments. The inventor analyzed the underlying reasons for the viewing of different service data by irrelevant service departments and found that because the existing PON-based optical communication network uses gray light (the upstream and downstream signals use different wavelengths respectively and do not perform wavelength division multiplexing) as the carrier for data transmission, the data of different service departments can only share one signal transmission link within a set of optical communication networks for transmission, resulting in the risk that different service data can be viewed across departments during transmission. To achieve physical isolation of the data transmission of different service departments, multiple sets of optical communication networks need to be configured for different service departments to transmit data, resulting in high construction costs for network infrastructure and low utilization rate of data transmission capabilities.

[0027] In response to the above data security appearance and the analysis of the technical reasons for generating this data security appearance, the inventor further proposed a data transmission system and method based on wavelength division multiplexing passive optical network. By configuring a completely independent OLT port and GPON OLT module for each service type in the optical line terminal of the data transmission system to transmit the corresponding service data at the specified upstream and downstream wavelengths, physical port-level isolation is achieved, eliminating the risk of configuration crossover or misoperation caused by sharing OLT ports for service data, and ensuring the clarity of operation and maintenance management and the clarity of service boundaries. The multiplexer / demultiplexer and ODN set in the data transmission system correspondingly achieve the multiplexed transmission of multiple wavelengths in the same optical fiber. For the upstream and downstream signals corresponding to different wavelengths in the ONU, by setting different BOSAs to only receive the upstream and downstream optical signals corresponding to the corresponding service type, each user terminal connected to the BOSA can only transmit and receive the corresponding wavelength signals, thereby achieving data physical isolation without significantly increasing the construction cost of network infrastructure and effectively eliminating the risk of cross-department data access or eavesdropping.

[0028] Please refer to Figure 1 , which is the overall architecture diagram of the data transmission system based on wavelength division multiplexing passive optical network provided by the embodiment of the present invention. As Figure 1 shown, the data transmission system includes: An optical line terminal 20, including a plurality of GPON OLT modules, each GPON OLT module is used to realize the transmission of the downstream optical signal corresponding to one service type and the reception of the upstream optical signal, and the upstream optical signal and the downstream optical signal of different service types respectively correspond to a unique wavelength; The first multiplexer / demultiplexer 211 includes a plurality of demultiplexing interfaces and one multiplexing interface. Each demultiplexing interface is connected to a GPON OLT module, and the multiplexing interface is connected to the first interface of the ODN 40. The first multiplexer / demultiplexer 211 is configured to synthesize a plurality of downstream optical signals into a first mixed optical signal and then transmit the first mixed optical signal to the ODN 40; and to separate the second mixed optical signal into upstream optical signals corresponding to each service type and then transmit the upstream optical signals to the corresponding GPON OLT modules. The ODN 40 includes a plurality of second interfaces, and each second interface is connected to an ONU 10. The ODN 40 is configured to transmit the first mixed optical signal to each ONU 10, and to synthesize each third mixed optical signal into a second mixed optical signal and then transmit the second mixed optical signal to the first multiplexer / demultiplexer 211. The ONU 10 is configured to separate the downstream optical signals corresponding to at least one service type from the first mixed optical signal, convert the downstream optical signals into first electrical signals and transmit the first electrical signals to the corresponding user terminals; and to convert the second electrical signals uploaded by the user terminals and corresponding to at least one service type into upstream optical signals, synthesize the upstream optical signals into a third mixed optical signal and transmit the third mixed optical signal to the ODN 40.

[0029] In an embodiment of the present application, by setting a plurality of GPON OLT modules in the optical line terminal of the data transmission system, each GPON OLT module is configured to implement the transmission of upstream optical signals and downstream optical signals required for data transmission corresponding to one service type. Each GPON OLT module independently sets interfaces, and a multiplexer / demultiplexer and an ODN are additionally provided. The user terminals directly responsible for data processing corresponding to the service type are only connected to the ONU and use the corresponding upstream optical signals and downstream optical signals for data transmission. The user terminals can only transmit data related to the corresponding service type through the corresponding upstream optical signals and downstream optical signals within a set of optical communication networks. Data cross-access of different service types is impossible at both the ONU 10 and the optical line terminal 20. Thus, with a relatively low construction cost of the network infrastructure and a high utilization of the data transmission capacity, physical isolation of data transmission between different service types is ensured, and the risk that the transmission of different service data is viewed by irrelevant service departments is eliminated.

[0030] In an alternative implementation, as Figure 1As shown in the figure, each ONU 10 includes a first sub-network unit and a second sub-network unit. When the first sub-network unit is used for signal transmission, it separates the downstream optical signal corresponding to at least one service type from the first mixed optical signal, converts the downstream optical signal into a first electrical signal and transmits it to the corresponding user terminal. And it converts the second electrical signal corresponding to at least one service type uploaded by the user terminal into an upstream optical signal, and then combines the upstream optical signals into a third mixed optical signal and transmits it to the ODN 40. When the second sub-network unit is used for signal transmission, it separates the downstream optical signal corresponding to at least one service type from the first mixed optical signal, converts the downstream optical signal into a first electrical signal and transmits it to the corresponding user terminal. And it converts the second electrical signal corresponding to at least one service type uploaded by the user terminal into an upstream optical signal, and then combines the upstream optical signals into a third mixed optical signal and transmits it to the ODN 40. Only one of the first sub-network unit and the second sub-network unit performs signal transmission at the same time.

[0031] Corresponding to Figure 1 In the ONU 10 shown in the figure, there is a group of internal architecture hardware represented by solid lines and a group of internal architecture hardware represented by dashed lines. The two groups of internal architecture hardware respectively correspond to the first sub-network unit and the second sub-network unit. Only one of the first sub-network unit and the second sub-network unit performs signal transmission at the same time, which is equivalent to the first sub-network unit and the second sub-network unit being master-slave to each other. When the hardware corresponding to the service type in the ONU needs to be suspended due to a fault or routine inspection, it can be seamlessly switched to the standby sub-network unit to keep the normal operation of the entire data transmission system. The first sub-network unit and the second sub-network unit switch the connection state through a switch, and the sub-network unit connected to the signal transmission link performs signal transmission accordingly.

[0032] In another alternative implementation, as Figure 1As shown in the figure, the first sub-network unit includes a plurality of first BOSAs (Bi-Directional Optical Sub-Assembly), and the second sub-network unit includes a plurality of second BOSAs. The plurality of first BOSAs are used to transmit optical signals corresponding to different service types; the plurality of second BOSAs are used to transmit optical signals corresponding to different service types. The first BOSA and the second BOSA can be regarded as corresponding to the same bi-directional optical sub-assembly. Each first BOSA and each second BOSA are respectively used to implement the optical signal transmission required for data transmission corresponding to one service type. When the first sub-network unit performs signal transmission, the plurality of first BOSAs comprehensively implement the transmission of optical signals of corresponding multiple wavelengths; when the second sub-network unit performs signal transmission, the plurality of second BOSAs comprehensively implement the transmission of optical signals of corresponding multiple wavelengths. The first BOSA and the second BOSA are only used to distinguish that a plurality of BOSAs are in different sub-network units and support different sub-network units to respectively implement optical signal transmission.

[0033] In another alternative implementation, please refer to Figures 2 - 5 , as shown in the figure, the ONU 10 includes an upper housing 11, a lower housing 12, and a plurality of circuit boards 14. The side of the ONU 10 may further include a plurality of interfaces 13. The plurality of circuit boards 14 are arranged in a cavity formed by the upper housing 11 and the lower housing 12; each circuit board 14 is used to carry a first BOSA 141 and a second BOSA 142 corresponding to the same service type, and the service types corresponding to each circuit board 14 are different. In the cavity formed by the upper housing 11 and the lower housing 12, the plurality of circuit boards 14 are stacked. If the number of service types is three, correspondingly as Figure 4 shown, three layers of circuit boards 14 are stacked. By arranging the multi-layer circuit boards 14 in the cavity, it is convenient for assembly and can also dissipate heat quickly and centrally. Due to the connection design in the data transmission system, the plurality of interfaces 13 only support the data transmission of the corresponding service type. In the specific implementation process, the interfaces 13 corresponding to different service types can be distinguished by different colors and / or patterns, so that after the data transmission system is laid out in a specific application scenario, the user terminals corresponding to different business departments can quickly connect to the corresponding interfaces.

[0034] In yet another alternative implementation, as Figure 6As shown in the figure, the ONU 10 includes a main circuit board 15 and multiple slave circuit boards 16. The main circuit board 15 includes multiple main interfaces, and each slave circuit board 16 includes a slave interface; each slave circuit board 16 is used to carry BOSAs corresponding to different service types and is connected to the main circuit board 15 through the slave interface and the main interface. Each slave circuit board 16 corresponds to a service type and carries the corresponding BOSA, and is installed in a pluggable manner through the interface, which can effectively improve the installation efficiency; when hardware corresponding to some service types fails, the maintenance cost is relatively low and the maintenance efficiency is relatively high. Each slave circuit board 16 is also provided with multiple data interfaces. When two BOSAs that are mutually primary and backup are provided on the slave circuit board 16, each slave circuit board 16 is provided with four FE interfaces, two RS232 interfaces, and two RS485 interfaces. Figure 6 In each slave circuit board 16, two FE interfaces, one RS232 interface, and one RS485 interface are presented from a top-down perspective as the interfaces corresponding to one sub-network unit. When the two sub-network units that are mutually primary and backup switch, the sub-network system currently performing data transmission is conducted with the corresponding various interfaces through the switching chip. Both the RS232 interface and the RS485 interface correspond to up and down lines. The RS232 interface and the RS485 interface determine the currently used interface type through logical switch switching, and the other end of the logical switch is connected to the relevant interfaces of the CPU of the ONU 10 through the same up and down lines.

[0035] In another alternative implementation, as Figure 1 shown, the number of service types is three. The wavelengths of the upstream optical signals corresponding to the three service types are 1271nm, 1291nm, and 1311nm respectively, and the wavelengths of the downstream optical signals corresponding to them are 1331nm, 1351nm, and 1371nm respectively. Specifically, for example, the wavelength of the upstream optical signal corresponding to the first service type is 1271nm, and the wavelength of the downstream optical signal is 1331nm; the wavelength of the upstream optical signal corresponding to the second service type is 1291nm, and the wavelength of the downstream optical signal is 1351nm; the wavelength of the upstream optical signal corresponding to the third service type is 1311nm, and the wavelength of the downstream optical signal is 1357nm. The transmission hardware for optical signals with these wavelengths is relatively mature. Implementing the data transmission system based on wavelength division multiplexing passive optical network in the embodiments of the present application with these wavelengths can effectively control the production cost of the equipment and reduce the investment in the network infrastructure construction of users.

[0036] In another alternative implementation, corresponding to the three service types, the first multiplexer / demultiplexer 211 includes three demultiplexing interfaces. The first multiplexer / demultiplexer 211 is configured to combine the downstream optical signals transmitted by the three GPON OLT modules into a first mixed optical signal, and to separate the second mixed optical signal into upstream optical signals corresponding to the three service types, and transmit the three upstream optical signals to the receiving interfaces of the corresponding GPON OLTs respectively.

[0037] In yet another alternative implementation, each ONU 10 includes a second multiplexer / demultiplexer 17. The second multiplexer / demultiplexer 17 is configured to separate the downstream optical signals corresponding to at least one service type from the first mixed optical signal, and transmit the downstream optical signals to the corresponding BOSA; and to combine the upstream optical signals transmitted by the BOSA into a third mixed optical signal.

[0038] When deploying the data transmission system in the embodiments of the present application to specific application scenarios (such as large factory areas, single-user office buildings, etc.), the optical line terminal is set in a dedicated computer room or an external equipment cabinet to realize the connection with the external public network. The ONU is set at a position where the user terminal can be connected to perform data transmission. The first multiplexer / demultiplexer and the ODN can be installed according to the specific application scenario at positions that can support the corresponding connection and signal transmission requirements in the embodiments of the present application. After completing the deployment and connection at the corresponding appropriate positions, the user terminal can realize the data transmission of different service types with the service data isolated from each other because of the mutually isolated signal transmission links formed by the data transmission system in the embodiments of the present application. Different business departments cannot view data randomly, eliminating the risk of service data leakage.

[0039] The embodiments of the present invention also provide a data transmission method based on a wavelength division multiplexing passive optical network. The data transmission method is applicable to the data transmission system based on a wavelength division multiplexing passive optical network in any of the foregoing embodiments, including but not limited to steps S110 - step S120.

[0040] Step S110: Each GPON OLT module of the optical line terminal transmits the downstream optical signal corresponding to a service type to the demultiplexing interface of the first multiplexer / demultiplexer. After the first multiplexer / demultiplexer combines the multiple downstream optical signals into a first mixed optical signal, it transmits the first mixed optical signal to the ODN. The ODN transmits the first mixed optical signal to multiple ONUs. The ONU separates the downstream optical signals corresponding to at least one service type from the first mixed optical signal, converts the downstream optical signal into a first electrical signal, and transmits it to the corresponding user terminal.

[0041] Step S120: After converting the second electrical signal corresponding to at least one service type uploaded by the user terminal into an upstream optical signal, the ONU combines the upstream optical signals into a third mixed optical signal and transmits it to the ODN. After the ODN combines each third mixed optical signal into a second mixed optical signal, the ODN transmits the second mixed optical signal to the first optical splitter / combiner. After the first optical splitter / combiner separates the second mixed optical signal into upstream optical signals corresponding to each service type, the first optical splitter / combiner transmits the upstream optical signals to the corresponding GPON OLT modules, and each GPON OLT module receives the corresponding upstream optical signal.

[0042] Based on the wavelength-division multiplexing-based data transmission system described above, after deploying the data transmission system to a specific application scenario and connecting the user terminals configured by each service type's corresponding business department to the corresponding interfaces in the ONU, without other configurations, the data transmission system can implement the dedicated transmission of service data of different service types through the signal link formed based on the connection method described above. Data viewing between different business departments cannot be carried out randomly, eliminating the risk of service data leakage.

[0043] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the embodiments of the present invention are not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the embodiments of the present invention. Therefore, although the embodiments of the present invention have been described in detail through the above embodiments, the embodiments of the present invention are not limited to the above embodiments. Without departing from the concept of the embodiments of the present invention, more other equivalent embodiments can be included, and the scope of the embodiments of the present invention is determined by the scope of the appended claims.

Claims

1. A data transmission system based on a wavelength division multiplexing passive optical network, characterized in that, Comprising: An optical line terminal, including multiple GPON OLT modules, each of the GPON OLT modules being used to implement the transmission of a downstream optical signal corresponding to a service type and the reception of an upstream optical signal, and the upstream optical signals and downstream optical signals of different service types corresponding to unique wavelengths respectively; A first multiplexer / demultiplexer, including multiple demultiplexing interfaces and a multiplexing interface, each of the demultiplexing interfaces being connected to one of the GPON OLT modules, the multiplexing interface being connected to a first interface of the ODN, and the first multiplexer / demultiplexer being used to synthesize multiple downstream optical signals into a first mixed optical signal and then transmit the first mixed optical signal to the ODN; And being used to separate the second mixed optical signal into upstream optical signals corresponding to each service type and then transmit the upstream optical signals to the corresponding GPON OLT modules; The ODN, including multiple second interfaces, each of the second interfaces being connected to an ONU, the ODN being used to transmit the first mixed optical signal to each ONU and being used to synthesize each third mixed optical signal into the second mixed optical signal and then transmit the second mixed optical signal to the first multiplexer / demultiplexer; The ONU is used to separate a downstream optical signal corresponding to at least one service type from the first mixed optical signal, convert the downstream optical signal into a first electrical signal and transmit it to the corresponding user terminal; And being used to convert a second electrical signal corresponding to at least one service type uploaded by the user terminal into an upstream optical signal, synthesize the upstream optical signals into the third mixed optical signal and transmit it to the ODN.

2. The data transmission system based on a wavelength division multiplexing passive optical network according to claim 1, characterized in that Each ONU includes a first sub-network unit and a second sub-network unit; When the first sub-network unit is used for signal transmission, it separates a downstream optical signal corresponding to at least one service type from the first mixed optical signal, converts the downstream optical signal into a first electrical signal and transmits it to the corresponding user terminal; And being used to convert a second electrical signal corresponding to at least one service type uploaded by the user terminal into an upstream optical signal, synthesize the upstream optical signals into the third mixed optical signal and transmit it to the ODN; When the second sub-network unit is used for signal transmission, it separates a downstream optical signal corresponding to at least one service type from the first mixed optical signal, converts the downstream optical signal into a first electrical signal and transmits it to the corresponding user terminal; And being used to convert a second electrical signal corresponding to at least one service type uploaded by the user terminal into an upstream optical signal, synthesize the upstream optical signals into the third mixed optical signal and transmit it to the ODN; Only one of the first sub-network unit and the second sub-network unit performs signal transmission at the same time.

3. The data transmission system based on a wavelength division multiplexing passive optical network according to claim 2, characterized in that The first sub-network unit includes a plurality of first BOSAs, and the second sub-network unit includes a plurality of second BOSAs. The plurality of first BOSAs are used to transmit optical signals corresponding to different service types; the plurality of second BOSAs are used to transmit optical signals corresponding to different service types.

4. The data transmission system based on a wavelength division multiplexing passive optical network according to claim 3, characterized in that, The ONU includes an upper housing, a lower housing, and a plurality of circuit boards. The plurality of circuit boards are disposed in a cavity formed by the upper housing and the lower housing; each circuit board is used to carry a first BOSA and a second BOSA corresponding to the same service type, and the service type corresponding to each circuit board is different.

5. The data transmission system based on a wavelength division multiplexing passive optical network according to claim 4, wherein The plurality of circuit boards are stacked.

6. The data transmission system based on a wavelength division multiplexing passive optical network according to any one of claims 1 to 3, characterized in that, The ONU includes a main circuit board and a plurality of slave circuit boards. The main circuit board includes a plurality of main interfaces, and each slave circuit board includes a slave interface; each slave circuit board is used to carry BOSAs corresponding to different service types and is connected to the main circuit board through the slave interface and the main interface.

7. The data transmission system based on a wavelength division multiplexing passive optical network according to any one of claims 1-5, characterized in that, The number of service types is three. The wavelengths of the upstream optical signals corresponding to the three service types are 1271 nm, 1291 nm, and 1311 nm respectively, and the wavelengths of the downstream optical signals corresponding to them are 1331 nm, 1351 nm, and 1371 nm respectively.

8. The data transmission system based on a wavelength division multiplexing passive optical network according to any one of claims 3-5, characterized in that The first multiplexer / demultiplexer includes three demultiplexing interfaces. The first multiplexer / demultiplexer is used to combine the downstream optical signals sent by the three GPON OLT modules into the first mixed optical signal, and to separate the second mixed optical signal into upstream optical signals corresponding to the three service types, and transmit the three upstream optical signals to the receiving interfaces of the corresponding GPON OLTs respectively.

9. The data transmission system based on a wavelength division multiplexing passive optical network according to any one of claims 3 to 5, characterized in that, Each ONU includes a second multiplexer / demultiplexer. The second multiplexer / demultiplexer is used to separate the downstream optical signals corresponding to at least one service type from the first mixed optical signal and transmit the downstream optical signals to the corresponding BOSAs; and to combine the upstream optical signals transmitted by the BOSAs into the third mixed optical signal.

10. A data transmission method based on a wavelength division multiplexing passive optical network, characterized in that, The method is applicable to the wavelength division multiplexing passive optical network-based data transmission system according to any one of claims 1 to 9, and includes: Each GPON OLT module of the optical line terminal sends a downstream optical signal corresponding to a service type to the demultiplexing interface of the first multiplexer / demultiplexer. After the first multiplexer / demultiplexer combines the plurality of downstream optical signals into the first mixed optical signal, it transmits the first mixed optical signal to the ODN. The ODN transmits the first mixed optical signal to a plurality of ONUs. The ONU separates the downstream optical signals corresponding to at least one service type from the first mixed optical signal, converts the downstream optical signals into first electrical signals, and transmits them to the corresponding user terminals; After converting the second electrical signal corresponding to at least one of the service types uploaded by the user terminal into an upstream optical signal, the ONU combines the upstream optical signals into the third hybrid optical signal and transmits it to the ODN. After combining each of the third hybrid optical signals into the second hybrid optical signal, the ODN transmits the second hybrid optical signal to the first optical combiner / splitter. After separating the second hybrid optical signal into upstream optical signals corresponding to each of the service types, the first optical combiner / splitter transmits the upstream optical signals to the corresponding GPON OLT modules, and each of the GPON OLT modules receives the corresponding upstream optical signal.

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