OPTICAL DIVIDING DEVICE AND OPTICAL DIVIDING SYSTEM

Abstract

The modalities of this application disclose an optical splitter and an optical splitter system, such that the optical splitter can be connected to more ONTs, and investment costs and construction difficulty are reduced in a scenario with a relatively high user density. The optical splitter includes a housing, at least one first optical splitter, a multi-core input optical interface, a multi-core output optical interface, and at least one single-core output optical interface. The multi-core input optical interface, the multi-core output optical interface, and the single-core output optical interface are, at a minimum, arranged on an outer wall of the housing. The first optical splitter is, at a minimum, arranged within the housing, and each first optical splitter includes an input end, a first output end, and at least one second output end.The multi-core input optical interface is connected to one input end of at least one first optical splitter, the first output end of each first optical splitter is connected to the multi-core output optical interface, and the second output end of each first optical splitter is connected to the single-core output optical interface in a one-to-one correspondence.

Description

OPTICAL DIVIDING DEVICE AND OPTICAL DIVIDING SYSTEM This application claims priority over Chinese patent application ns202021750495.7, filed on August 20, 2020, and entitled OPTICAL DIVIDING DEVICE AND OPTICAL DIVIDING SYSTEM, which is incorporated herein by reference in its entirety. FIELD OF INVENTION This application relates to the field of optical communication and, in particular, to an optical splitting device and an optical splitting system. BACKGROUND OF THE INVENTION With the development of modern society and the explosive growth of information, the demand for network performance capacity is constantly increasing. Optical transmission is gradually becoming a widely used modern communications solution due to its unique characteristics, such as ultra-high bandwidth and low electromagnetic interference. In particular, a newly constructed network, such as fiber-to-the-home (FTTH) access networks, is currently being deployed on a large scale. In the construction of fiber-to-the-home (FTTH) networks, an intermediate optical distribution network (ODN) is required for interconnection between an optical line terminal (OLT) and an optical network terminal (ONT). The ODN includes a feeder cable, a distribution cable, and a drop cable. In a current ODN solution, a fiber access terminal (FAT) configured to connect a distribution cable and a drop cable only supports one single-core distribution cable, and each FAT supports a limited number of drop cables. In a scenario with a relatively high user density, the number of distribution cables and FATs needs to be increased. Therefore, investment costs and construction complexity increase. BRIEF DESCRIPTION OF THE INVENTION The modalities of this application provide an optical splitting device and an optical splitting system, so that the optical splitting device can be connected to more ONTs, and investment costs and construction difficulty are reduced in a scenario with a relatively high user density. According to a first aspect, one embodiment of the present application provides an optical splitting device, comprising a housing, at least one first optical splitter, a multi-core input optical interface, a multi-core output optical interface, and at least one single-core output optical interface. The multi-core input optical interface, the multi-core output optical interface, and the single-core output optical interface are arranged on an outer wall of the housing. At least one first optical splitter is arranged within the housing. Each first optical splitter includes an input end, a first output end, and at least one second output end.The multi-core input optical interface is connected to the input end of at least one first optical splitter, the first output end of each first optical splitter is connected to the multi-core output optical interface, and the second output end of each first optical splitter is connected to the single-core output optical interface in a one-to-one correspondence. In this implementation, the multi-core optical input interface of the optical splitter supports multiple optical fibers, multiple optical splitters can be arranged within the optical splitter, and each optical fiber can be connected to an input end of a corresponding optical splitter. Although the number of output ends of each optical splitter is limited, increasing the number of optical splitters in the optical splitter allows it to be connected to more ONTs. Therefore, in a scenario with relatively high user density, investment costs and construction complexity are reduced. In one possible implementation, a first multi-core adapter is placed on the multi-core input optical interface, a second multi-core adapter on the multi-core output optical interface, and a single-core adapter on each single-core output optical interface. Preconfiguring the fiber adapters allows the use of plug-and-play fiber connectors during on-site construction. This saves on splicing operations and improves construction efficiency. In a possible implementation, a hosting port of the first multicore adapter is connected to one end of at least one first single-core fiber connector, and the other end of at least one first single-core fiber connector is connected to the input end of at least one first optical splitter in a one-to-one correspondence using an optical fiber; a hosting port of the second multicore adapter is connected to one end of at least one second single-core fiber connector, and the other end of at least one second single-core fiber connector is connected to the first output end of at least one first optical splitter in a one-to-one correspondence using an optical fiber;and one host port of each single-core adapter is connected to one end of every third single-core fiber connector in a one-to-one correspondence, and the other end of every third single-core fiber connector is connected to every second output end of the first optical splitter using an optical fiber. In this implementation, a mode is provided for; MA.a.ZUZ J / UUl 994 specific connection in the optical splitting device. Therefore, the viability of this solution is improved. In a possible implementation, the number of fiber cores supported by the first multi-core adapter and the number of fiber cores supported by the second multi-core adapter are greater than or equal to the number of fiber cores in the first two optical splitters. In a real-world application, during an initial fiber deployment phase, there may not be enough users requiring fiber access. In this case, only a few optical splitters can be pre-configured in a second optical splitter device. When access demand increases later, all available optical splitters can be connected to complete the subsequent capacity expansion. This design can meet the demand of more customers and save customers money in the initial phase.Additionally, no optical splitter needs to be added in subsequent capacity upgrades; only an optical splitter needs to be added to the original optical splitter. Therefore, manufacturing complexity and material costs are reduced. In one possible implementation, one external port on the first multicore adapter is configured to connect to a first multicore fiber connector, one external port on the second multicore adapter is configured to connect to a second multicore fiber connector, and one external port on each single-core adapter is configured to connect to a fourth single-core fiber connector. This implementation provides a connection mode between the optical splitter and an external fiber connector, thus further enhancing the viability of this solution. In a possible implementation, one optical cable connected to the first multi-core fiber connector and one optical cable connected to the second multi-core fiber connector are distribution cables, and one optical cable connected to the fourth single-core fiber connector is a drop cable. The optical splitter in this application is primarily used for distribution cables, highlighting the practical value of this solution. In one possible implementation, at least one second optical splitter is also arranged in the housing. The second output end of the first optical splitter is connected to an input end of the second optical splitter in a one-to-one correspondence, and an output end of the second optical splitter is connected to the single-core optical output interface in a one-to-one correspondence. In this implementation, the output end of the first optical splitter can also be connected to the second optical splitter. Therefore, the scalability of this solution is improved. In one possible implementation, the first optical splitter is an unequal optical splitter, and MA.a.ZUZ J / UUl »»4 The optical output power of the first output end is greater than the optical output power of the second output end. It can be understood that, since the multicore optical output interface connected to the first output end is configured to connect to a multicore optical input interface of an optical splitting device at a subsequent level, assigning a relatively high optical power to the first output end can allow higher-power optical signals to be retained in a trunk path and transmitted over a greater distance, so that optical signals are distributed to users for use over a greater distance. In one possible implementation, the housing includes a base and a top cover. The base and top cover are detachably and permanently connected. The multi-core input optical interface, the multi-core output optical interface, and the single-core output optical interface are arranged on one end face of the base. This implementation provides a specific housing structure, making this solution more practical. According to a second aspect, the present application provides an optical splitting device, which includes a housing, a multi-core input optical interface and a plurality of multi-core output optical interfaces, wherein the multi-core input optical interface and the plurality of multi-core output optical interfaces are arranged on an outer wall of the housing, and the multi-core input optical interface is connected to the plurality of multi-core output optical interfaces. In one possible implementation, a first multi-core adapter is placed on the multi-core input optical interface, and a second multi-core adapter is placed on each multi-core output optical interface. Preconfiguring the fiber adapters allows the use of plug-and-play fiber connectors during on-site construction. This saves on splicing operations and improves construction efficiency. In one possible implementation, one housing port of the first multicore adapter is connected to one end of a first multicore fiber connector, one housing port of each subsequent multicore adapter is connected to one end of a plurality of single-core fiber connectors, and the other end of the first multicore fiber connector is connected to the other end of the plurality of single-core fiber connectors via a fiber patch cable. This implementation provides a specific connection mode in the optical splitter, thus improving the feasibility of this solution. In one possible implementation, an off-site port of the first multi-core adapter is configured to connect to a second multi-core fiber connector, and ML / a / ZUZ J / UUl »»4 The ports outside the housing of the plurality of second multicore adapters are configured to connect to a plurality of third multicore fiber connectors in a one-to-one correspondence. In this implementation, a connection mode is provided between the optical splitter and an external fiber connector. Therefore, the viability of this solution is further improved. In one possible implementation, a plurality of optical splitters are also provided in the housing. These optical splitters are one-to-one with the multi-core output optical interfaces. One input end of each optical splitter is connected to the multi-core input optical interface, and a plurality of output ends of each optical splitter are connected to a corresponding multi-core output optical interface. This arrangement of optical splitters can save PON resources while ensuring high-density access for users. In one possible implementation, the housing includes a base and a top cover. The base and top cover are connected in a detachable and fixed manner, and the multi-core input optical interface and the plurality of multi-core output optical interfaces are arranged on one end face of the base. This application provides a specific housing structure, making this solution more practical. According to a third aspect, the present application provides an optical splitting system, which includes an OLT, a plurality of ONTs, a first optical splitting device, and a plurality of groups of cascaded second optical splitting devices, wherein the first optical splitting device is the optical splitting device according to any implementation of the second aspect, and the second optical splitting device is the optical splitting device according to any implementation of the first aspect. The OLT is connected to a multi-core optical input interface of the first optical splitter. Each multi-core optical output interface of the first optical splitter is connected to a multi-core optical input interface of a second optical splitter at the first level of a cascaded group of second optical splitters. A multi-core optical output interface of a second optical splitter at a higher level in every two adjacent cascaded second optical splitters is connected to a multi-core optical input interface of a second optical splitter at a lower level. A single-core optical output interface of each second optical splitter is connected to the ONT in a one-to-one correspondence. In the modalities of this application, the multicore input optical interface of the The ML / a / ZUZ J / UUl 994 optical splitting device supports multiple optical fibers. Multiple optical splitters can be arranged within the device, and each fiber can be connected to the input end of a corresponding optical splitter. Although the number of output ends for each optical splitter is limited, increasing the number of optical splitters allows for connection to more ONTs. Therefore, in scenarios with relatively high user density, investment costs and construction complexity are reduced. BRIEF DESCRIPTION OF THE DRAWINGS ML / a / ZUZ J / UUl »»4 FIGURE 1 is an architectural diagram of a network to which this request applies. FIGURE 2 is a schematic diagram of one modality of an optical splitting system according to this application. FIGURE 3 is a schematic structural diagram of a first optical splitting device according to this application. FIGURE 4 is a schematic diagram of one modality of a first optical splitting device according to this application. FIGURE 5 is a schematic structural diagram of a second optical splitting device according to this application. FIGURE 6 is a schematic diagram of one modality of a second optical splitting device according to this application. FIGURE 7 is a schematic diagram of another modality of a second optical splitting device according to this application. FIGURE 8 is a schematic diagram of another modality of a second optical splitting device according to this application: and FIGURE 9 is a schematic diagram of another modality of a second optical splitting device according to this application. DETAILED DESCRIPTION OF THE INVENTION The modalities of this application provide an optical splitting device and an optical splitting system, so that the optical splitting device can be connected to more ONTs, and investment costs and construction difficulty are reduced in a scenario with a relatively high user density. The technical solutions in the embodiments of the present invention are described below clearly and completely, with reference to the accompanying drawings. The embodiments described herein are apparently only some, but not all, of the embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without creative effort shall be included within the scope of protection of the present invention. Figure 1 is an architectural diagram of a network to which this application applies. This application primarily applies to a passive optical network (PON). FTTx can be FTTH (Fiber to the Home), FTTC (Fiber to the Curb), FTTP (Fiber to the Premises), FTTN (Fiber to the Node or Neighborhood), FTTO (Fiber to the Office), or FTTSA (Fiber to the Service Area). Taking an FTTH network as an example, in a central office (CO), the fiber optic cable output from an optical line terminal (OLT) connects to an optical distribution frame (ODF).An optical cable distributed via the ODF connects to a fiber distribution terminal (FDT) located at an optical distribution point (ODP). If the ODF is far from the FDT, a splitting and splicing closure (SSC) can be installed between the ODF and the FDT for the connection. In the secondary distribution via the FDT, an optical cable connects to a fiber access terminal (FAT) located at an optical access point (OAP). If the FDT is far from the FAT, an SSC can also be installed for the connection. The FAT is configured to connect an optical cable to an optical network terminal (ONT) in a home. The optical cable between the OLT and the optical distribution point is called the feeder cable. The optical cable between the optical distribution point and the optical access point is called the distribution cable.The optical cable between the optical access point and the ONT is called the downlead cable. Specifically, the optical splitter provided in this application can be the FAT connected to the optical access point. The following section describes, first, an optical splitting system provided for in this application. Figure 2 is a schematic diagram of one embodiment of an optical splitting system according to this application. The optical splitting system includes an optical line terminal 10, a first optical splitting device 20, a plurality of groups of cascaded second optical splitting devices (as shown in Figure 2, each group of cascaded second optical splitting devices includes optical splitting devices 301 to 303), and a plurality of optical network terminals 40. The optical line terminal 10 is connected to a multicore input optical interface of the first optical splitting device 20.The first optical splitting device 20 has a plurality of multicore output optical interfaces, and each multicore output optical interface corresponds to a group of second cascaded optical splitting devices (as shown in FIGURE 2, corresponding to four groups of second cascaded optical splitting devices). Specifically, each multicore output optical interface of the first device... MA / a / ZUZ J / UUl 994 Optical splitter 20 is connected to a multi-core input optical interface of an optical splitter 301 at a first level in a group of cascaded second optical splitters. A multi-core output optical interface of a second optical splitter at a higher level in every two adjacent second optical splitters is connected to a multi-core input optical interface of a second optical splitter at a lower level.As shown in FIGURE 2, a multicore output optical interface of optical splitter 301 at the first level is connected to a multicore input optical interface of optical splitter 302 at the second level, a multicore output optical interface of optical splitter 302 at the second level is connected to a multicore input optical interface of an optical splitter at the third level, and so on. At least one optical splitter is arranged in each second optical splitter, and one input end of each optical splitter is connected to a multicore input optical interface of the second optical splitter using an optical fiber.The optical splitter further includes a plurality of output ends, where one output end is connected to a multi-core optical output interface of the second optical splitter device, and the other output ends are connected to a plurality of single-core optical output interfaces of the second optical splitter device in a one-to-one correspondence. A plurality of single-core optical output interfaces of each second optical splitter device are connected to a plurality of optical network terminals 40 in a one-to-one correspondence. It can be understood that, in the optical splitting system provided in this application, a device such as an ODF, an FDT, and an SSC can be additionally arranged between the optical line terminal 10 and the first optical splitting device 20. For further details, refer to the description in FIGURE 1. The details are not described again herein. It should be noted that the second cascaded optical splitters are two or more second optical splitters connected sequentially. It can be understood that a specific number of second cascaded optical splitters is not limited in this application. Additionally, the first optical splitter and the second optical splitter are connected using a multicore optical fiber, and every two adjacent second optical splitters are also connected using a multicore optical fiber. The number of fiber cores in the multicore optical fiber can be two, as shown in Figure 2. Alternatively, the optical fiber can be a multicore optical fiber with more than two fiber cores. This is not specifically limited in this application. MA.a.ZUZ J / UUl 994 The first optical splitting device shown in FIGURE 2 is described in detail below. FIGURE 3 is a schematic structural diagram of a first optical splitting device according to this application. The first optical splitting device includes a housing 21, a multi-core input optical interface 22, and a plurality of multi-core output optical interfaces (231, 232, 233, and 234 shown in FIGURE 3). The multi-core input optical interface 22 and the plurality of multi-core output optical interfaces are arranged on an outer wall of the housing 21. The multi-core input optical interface 22 is connected to the plurality of multi-core output optical interfaces. Specifically, the housing 21 includes a base 211 and a top cover 212. The base 211 and the top cover 212 are detachably and permanently attached.The multicore input optical interface 22 and the plurality of multicore output optical interfaces are arranged on one end face of the base 211. It should be understood that the multicore input optical interface and the multicore output optical interface can allow the passage of a plurality of optical fibers. In one possible implementation, a first multicore adapter is placed on the multicore input optical interface 22, and a second multicore adapter can be placed on each multicore output optical interface. Both the first and second multicore adapters can be fiber adapters configured to connect to fiber connectors. By preconfiguring the multicore adapters on the multicore input and multicore output optical interfaces, plug-and-play fiber connectors can be implemented during on-site construction. This saves splicing operations and improves construction efficiency. Specifically, the first multicore adapter is embedded in the multicore input optical interface 22, and each subsequent multicore adapter is embedded in a corresponding multicore output optical interface. One port of the first multicore adapter, located in housing 21, is connected to one end of a first multicore fiber connector 24. One port of the second multicore adapter, located in housing 21, is connected to one end of a plurality of single-core fiber connectors 25. For example, two single-core fiber connectors 25 are connected to each subsequent multicore adapter shown in FIGURE 3. The other end of the first multicore fiber connector 24 is connected to the other end of the plurality of single-core fiber connectors 25 via a fiber patch cable.For example, the other end of the first multicore fiber connector 24 shown in FIGURE 3 is split into eight optical fibers using a fiber patch cable, and each of the eight optical fibers is connected to a corresponding single-core fiber connector 25. ML / a / ZUZ J / UUl »»4 It should be noted that the first multi-core fiber connector 24 may be an MPO connector and that the single-core fiber connector 25 may be an LC connector. It may be understood that one port of the first multicore adapter, located outside housing 21, is configured to connect to one end of a second multicore fiber connector, and that the other end of the second multicore fiber connector can be connected to an OLT using a multicore optical fiber. One port of the second multicore adapter, located outside housing 21, is configured to connect to one end of a third multicore fiber connector, and the other end of the third multicore fiber connector can be connected to a multicore input optical interface of a second optical splitter using a multicore optical fiber. It should be understood that dust caps may be arranged on the ports outside the housing of the first and second multicore adapters. When it is not necessary to mount a fiber connector, a fiber adapter can be sealed by mounting a dust cap. It should be noted that the number of multicore output optical interfaces on the first optical splitter and the number of fiber cores supported by each multicore output optical interface are not limited in this application. Additionally, the number of fiber cores supported by the multicore input optical interface on the first optical splitter is also not limited in this application. Optionally, FIGURE 4 is a schematic diagram of one embodiment of the first optical splitting device according to this application. A plurality of optical splitters (optical splitters 261 to 264 shown in FIGURE 4) are further arranged in housing 21. The plurality of optical splitters correspond one-to-one with the plurality of multicore output optical interfaces. One input end of each optical splitter is connected to the multicore adapter at the multicore input optical interface 22. A plurality of output ends of each optical splitter are connected to a multicore adapter at a corresponding multicore output optical interface. For example, the optical splitters shown in FIGURE 4 are paired optical splitters with a 1:2 splitting ratio, and each optical splitter has one input end and two output ends.It should be understood that the optical splitters arranged in the first optical splitter can alternatively be unequal optical splitters and that the split ratios of the optical splitters are not limited in this application. In this configuration, the arrangement of the optical splitters in the first optical splitter can save PON resources while ensuring high-density user access. The second optical splitting device shown in FIGURE 2 is described in detail below. FIGURE 5 is a schematic structural diagram of a second optical splitting device according to this application. The second device ML / a / ZUZ J / UUl »»4 Optical splitter includes a housing 31, a multi-core input optical interface 32, a multi-core output optical interface 33, at least one single-core output optical interface 34, and at least one first optical splitter 35. The multi-core input optical interface 32, the multi-core output optical interface 33, and the single-core output optical interface 34 are arranged on an outer wall of the housing 31. The first optical splitter 35 is arranged in the housing 31. Each first optical splitter 35 includes an input end, a first output end, and at least one second output end.The multi-core input optical interface 32 is connected to the input end of each first optical splitter 35, the first output end of each first optical splitter 35 is connected to the multi-core output optical interface 33, and at least one second output end of each first optical splitter is connected to at least one single-core output optical interface 34 in a one-to-one correspondence. Specifically, the housing 31 includes a base 311 and a top cover 312. The base 311 and the top cover 312 are detachably and permanently attached. The multi-core input optical interface 32, the multi-core output optical interface 33, and the single-core output optical interface are arranged on one end face of the base 311.It should be understood that the multi-core input optical interface and the multi-core output optical interface allow the passage of a plurality of optical fibers, and that the single-core output optical interface allows the passage of a single optical fiber. It can be understood that a number of fiber cores supported by the multicore input optical interface 32 and a number of fiber cores supported by the multicore output optical interface 33 are greater than or equal to a number of the first optical splitters 35. The second optical splitter is described in more detail below, using Figure 6 as an example. Figure 6 is a schematic diagram of one embodiment of the second optical splitter according to this application. As shown in Figure 6, both the multicore input optical interface 32 and the multicore output optical interface 33 support two optical fibers, and the two optical fibers are connected respectively to one input end of an optical splitter 351 and one input end of an optical splitter 352. The splitting ratios of the optical splitter 351 and the optical splitter 352 are 1:9. One first output end of the optical splitter 351 is connected to the multicore output optical interface 33 via one optical fiber. Eight second output ends of the optical splitter 351 are connected to eight single-core output optical interfaces (3401 to 3408) in a one-to-one correspondence using optical fibers.One output end of the optical splitter 352 is connected to the multicore optical output interface 33 via an optical fiber. Eight second output ends of the optical splitter 352 are connected to eight single-core optical output interfaces (3409 to 3416) in one. MA.a.ZUZ J / UUl »»4 one-to-one correspondence using optical fibers. It should be understood that the 16 single-core optical output interfaces are connected to the ONTs in one-to-one correspondence using optical fibers. In one possible implementation, the optical splitter of the second optical splitting device is an unequal optical splitter, and the optical output power of the first output end is greater than the optical output power of the second output end. For example, the optical output power of the first output end represents 70% of the total output power, and the optical output power of the second output end represents 30% of the total output power.It can be understood that, because the multicore optical output interface 33 connected to the first output end is configured to connect to a multicore optical input interface of a second optical splitting device at a subsequent level, allocating a relatively high optical power to the first output end can allow higher power optical signals to be retained on a trunk path and transmitted over a longer distance, so that optical signals are distributed to users for use over a longer distance. Optionally, the optical output power of each second output end may be the same or different. A ratio between the optical power of the first output end and the optical power of the second output end may be 70 / 30, or it may be another ratio such as 80 / 20 or 90 / 10. The optical splitter of the second optical splitting device may alternatively be a pair optical splitter. This is not specifically limited herein. Figure 7 is a schematic diagram of another embodiment of the second optical splitter according to this application. In this implementation, a second optical splitter is also provided in housing 31. One input end of the second optical splitter is connected to the second output end of the first optical splitter, and one output end of the second optical splitter is connected to the single-core output optical interface in a one-to-one correspondence. As shown in Figure 7, the optical splitter 351 is similar to the optical splitter 351 shown in Figure 6, and is an unequal optical splitter with a split ratio of 1:9. The optical splitter 352 is different from the optical splitter 352 shown in Figure 6, and is an unequal optical splitter with a split ratio of 1:2. The first output end of the optical splitter 352 is also connected to the multi-core output optical interface 33 using an optical fiber.The second output end of optical splitter 352 is connected to an input end of optical splitter 353 using an optical fiber. Optical splitter 353 is a uniform optical splitter with a split ratio of 1:8. Eight output ends of optical splitter 353 are connected to eight single-core optical input interfaces (3409 to 3416) in a one-to-one correspondence using [unspecified device]. ML / a / ZUZ J / UUl »»4 optical fibers. It can be understood that a combination of optical splitter 352 and optical splitter 353 can also achieve an effect of optical splitter 351. In a real-world application, during an initial fiber deployment phase, there may not be enough users requiring fiber access. In this case, only optical splitters 351 and 352 can be pre-configured on the second optical splitter. When access demand subsequently increases, optical splitter 353 can be connected to complete the later capacity expansion. Additionally, in another implementation, as shown in Figure 8, only optical splitters 351 and 352 are pre-configured on the second optical splitter, and a third optical splitter 50 is added when access demand increases later. Specifically, the second output end of optical splitter 352 is connected to an input end of optical splitter 501 on the third optical splitter 50. It should be understood that optical splitter 501 in Figure 8 is similar to optical splitter 353 in Figure 7.The details are not described again herein. The previous design can meet the demands of more customers and save them initial investment. Furthermore, no additional optical splitter is required for subsequent capacity expansions; only an optical splitter needs to be added to the original optical splitter. Therefore, construction complexity and material costs are reduced. Specifically, the connection between the first optical splitter and the second optical splitter can be implemented using a fiber connector carrying an optical fiber, or it can be implemented using an optical fiber splice. This is not specifically limited herein. In a possible implementation, as shown in Figure 5, a first multicore adapter can be arranged on the multicore input optical interface 32, a second multicore adapter can be arranged on the multicore output optical interface 33, and a single-core adapter can be arranged on each single-core output optical interface. The first multicore adapter, the second multicore adapter, and the single-core adapter can be fiber adapters configured to connect to fiber connectors. Preconfiguring the fiber adapters allows the use of plug-and-play fiber connectors during on-site construction. This saves splicing operations and improves construction efficiency. Specifically, the first multicore adapter is integrated into the multicore optical input interface 32, the second multicore adapter is integrated into the multicore optical output interface 33, and each single-core adapter is mounted on its corresponding single-core optical output interface. One port of the first multicore adapter, located in the ML / a / ZUZ J / UUl »»4 Housing 31, is connected to one end of at least one first single-core fiber connector 36. The other end of each first single-core fiber connector 36 is connected to an input end of each first optical splitter 35 in a one-to-one correspondence using an optical fiber. A port of the second multi-core adapter, located in housing 31, is connected to one end of at least one second single-core fiber connector 37. The other end of each second single-core fiber connector 37 is connected to the first output end of each first optical splitter 35 in a one-to-one correspondence using an optical fiber.One port of each single-core adapter, located in housing 31, is connected to one end of each third single-core fiber connector 38 in a one-to-one correspondence, and the other end of each third single-core fiber connector 38 is connected to each second output end of the first optical splitter 35 in a one-to-one correspondence. For example, two single-core fiber connectors 36 are connected to the first multi-core adapter shown in FIGURE 5, and the two single-core fiber connectors 36 are further connected to the input ends of two optical splitters 35 respectively. Two single-core fiber connectors 37 are connected to the second multi-core adapter, and the two single-core fiber connectors 37 are further connected to the first output ends of two optical splitters 35 respectively. One single-core fiber connector 38 is connected to each single-core adapter, and each single-core fiber connector 38 is further connected to the second output ends of two optical splitters 35 in a one-to-one correspondence. It can be understood that one port of the first multicore adapter, located outside housing 31, is configured to connect to one end of a first multicore connector, and that the other end of the first multicore connector is configured to connect to a multicore output optical interface of a first optical splitter. One port of the second multicore adapter, located outside housing 31, is configured to connect to one end of a second multicore connector, and that the other end of the second multicore connector is configured to connect to the multicore input optical interface of the second optical splitter at the next level. One port of each single-core adapter, located outside housing 31, is configured to connect to each ONT in a one-to-one correspondence via a fiber connector.It should be understood that dust caps may be installed on the ports outside the housing of the first multi-core adapter, the second multi-core adapter, and the single-core adapter. When a fiber connector is not required, a fiber adapter can be sealed by installing a dust cap. It should be understood that dust covers may be arranged on the outside ports MA.a.ZUZ J / UUl »»4 housing for the first multicore adapter, the second multicore adapter, and the single-core adapter. Additionally, a number of optical splitters and a number of single-core output optical interfaces in the second optical splitting device are also not limited in this application. The second optical splitting device provided in this application has been described above. For the structures of other second optical splitting devices, such as a second optical splitting device at the last level in a plurality of cascaded second optical splitting devices, refer to the descriptions above. The second optical splitting device at the last level is described below. Figure 9 is a schematic diagram of another embodiment of the second optical splitter according to this application. It can be understood that the second optical splitter at the last level is already the last of the plurality of cascaded second optical splitters. Therefore, the second optical splitter does not include a multi-core output optical interface. Naturally, it is not necessary to separately assign an output end on an optical splitter of the second optical splitter to connect it to the multi-core output optical interface. Specifically, each single-core output optical interface (3401 to 3416 shown in Figure 8) of the second optical splitter is connected to one output end of optical splitter 351 and one output end of optical splitter 352 in a one-to-one correspondence.The structures of other parts are similar to those of the second optical splitting devices shown in FIGURE 5 and FIGURE 6. The details are not described again herein. In the configurations described in this application, the multi-core input optical interface of the second optical splitter supports multiple optical fibers. Multiple optical splitters can be arranged within the second optical splitter, and each optical fiber can be connected to an input end of a corresponding optical splitter. Although the number of output ends of each optical splitter is limited, the larger number of optical splitters in the second optical splitter allows it to connect to more ONTs. Therefore, in a scenario with relatively high user density, investment costs and construction complexity are reduced. It can be understood that names such as multi-core input optical interface, multi-core output optical interface, single-core output optical interface, optical splitter output end, and output end are defined based on the transmission direction of a downlink optical signal. During uplink optical signal transmission, the multi-core input optical interface can also be configured to emit light, as can the multi-core output optical interface and the output optical interface. MA.a.ZUZ J / UUl »»4 single-core optical interfaces can also be configured to emit light, the output end of the optical splitter can also be configured to emit light, and the input end of the optical splitter can also be configured to emit light. Therefore, the terms multi-core input optical interface, multi-core output optical interface, single-core output optical interface, optical splitter output end, and output end are merely terminology and are not intended to limit a function (e.g., light input or light output). The foregoing descriptions are merely examples of applications of the present invention, but are not intended to limit the scope of protection of the present invention. Any variation or substitution readily conceivable by a person skilled in the art within the technical field disclosed in the present invention shall be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An optical splitting device, characterized in that it comprises a housing, at least one first optical splitter, an input multicore optical interface, an output multicore optical interface, and at least one output singlecore optical interface, wherein the input multicore optical interface, the output multicore optical interface, and the output singlecore optical interface are arranged on an outer wall of the housing, the at least one first optical splitter is arranged in the housing, and each first optical splitter comprises an input end, a first output end, and at least one second output end;and the multi-core input optical interface is connected to the input end of at least one first optical splitter, the first output end of each first optical splitter is connected to the multi-core output optical interface, and the second output end of each first optical splitter is connected to the single-core output optical interface in a one-to-one correspondence.

2. The optical splitting device according to claim 1, characterized in that a first multicore adapter is arranged in the multicore input optical interface, a second multicore adapter is arranged in the multicore output optical interface, and a single-core adapter is arranged in each single-core output optical interface.

3. The optical splitter device according to claim 2, characterized in that a housing port of the first multicore adapter is connected to one end of at least one first single-core fiber connector, and the other end of at least one first single-core fiber connector is connected to the input end of at least one first optical splitter in a one-to-one correspondence by means of an optical fiber; a housing port of the second multicore adapter is connected to one end of at least one second single-core fiber connector, and the other end of at least one second single-core fiber connector is connected to the first output end of at least one first optical splitter in a one-to-one correspondence using an optical fiber;and one host port of each single-core adapter is connected to one end of every third single-core fiber connector in a one-to-one correspondence, and the other end of every third single-core fiber connector is connected to every second output end of the first optical splitter using an optical fiber.

4. The optical splitting device according to claim 2 or 3, characterized in that a number of fiber cores supported by the first multicore adapter and a number of fiber cores supported by the second multicore adapter are greater than or equal to a number of the first optical splitters. MA.a.ZUZ J / UUl 994 5. The optical splitting device according to any of claims 2 to 4, characterized in that an out-of-housing port of the first multicore adapter is configured to connect to a first multicore fiber connector, an out-of-housing port of the second multicore adapter is configured to connect to a second multicore fiber connector, and an out-of-housing port of each single-core adapter is configured to connect to a fourth single-core fiber connector.

6. The optical splitting device according to claim 5, characterized in that an optical cable connected to the first multi-core fiber connector and an optical cable connected to the second multi-core fiber connector are distribution cables, and an optical cable connected to the fourth single-core fiber connector is a drop cable.

7. The optical splitting device according to any of claims 1 to 6, characterized in that at least one second optical splitter is further disposed in the housing, the second output end of at least one first optical splitter is connected to an input end of at least one second optical splitter in a one-to-one correspondence, and an output end of the at least one second optical splitter is connected to the single-core output optical interface in a one-to-one correspondence.

8. The optical splitting device according to any of claims 1 to 7, characterized in that the first optical splitter is an unequal optical splitter, and the optical output power of the first output end is greater than the optical output power of the second output end.

9. The optical splitting device according to any of claims 1 to 8, characterized in that the housing comprises a base and a top cover, the base and the top cover being detachably and permanently connected, the multi-core input optical interface, the multi-core output optical interface and at least one single-core output optical interface are arranged on an end face of the base.

10. An optical splitting device, characterized in that it comprises a housing, an input multicore optical interface, and a plurality of output multicore optical interfaces, wherein the input multicore optical interface and the plurality of output multicore optical interfaces are arranged on an outer wall of the housing, and the input multicore optical interface is connected to the plurality of output multicore optical interfaces.

11. The optical splitting device according to claim 10, characterized in that a first multicore adapter is arranged in the multicore input optical interface, and a second multicore adapter is arranged in each MA / a / ZUZ J / UUl 994 multicore output optical interface.

12. The optical splitting device according to claim 11, characterized in that a housing port of the first multicore adapter is connected to one end of a first multicore fiber connector, a housing port of each second multicore adapter is connected to one end of a plurality of single-core fiber connectors, and the other end of the first multicore fiber connector is connected to the other end of the plurality of single-core fiber connectors using a fiber patch cable.

13. The optical splitting device according to claim 11 or 12, characterized in that an out-of-housing port of the first multicore adapter is configured to connect to a second multicore fiber connector, and the out-of-housing ports of the plurality of second multicore adapters are configured to connect to a plurality of third multicore fiber connectors in a one-to-one correspondence.

14. The optical splitting device according to any of claims 10 to 13, characterized in that a plurality of optical splitters are further arranged in the housing, the optical splitters are in one-to-one correspondence with the multicore output optical interfaces, one input end of each optical splitter is connected to the multicore input optical interface, and a plurality of output ends of each optical splitter are connected to a multicore output optical interface corresponding to the optical splitter.

15. The optical splitting device according to any of claims 10 to 14, characterized in that the housing comprises a base and a top cover, the base and the top cover being detachably and permanently connected, and the multi-core input optical interface and the plurality of multi-core output optical interfaces are arranged on an end face of the base.

16. An optical splitting system, characterized in that it comprises an OLT optical line terminal, a plurality of ONT optical network terminals, a first optical splitting device, and a plurality of groups of cascaded second optical splitting devices, wherein the first optical splitting device is the optical splitting device according to any one of claims 10 to 15, and the second optical splitting device is the optical splitting device according to any one of claims 1 to 9; and the OLT is connected to a multicore optical input interface of the first optical splitting device; each multicore optical output interface of the first optical splitting device is connected to a multicore optical input interface of a second optical splitting device.ZUZ J / UUl optical splitting device at a first level in a group of second cascaded optical splitting devices; a multicore output optical interface of a second optical splitting device at a higher level of every two adjacent second cascaded optical splitting devices is connected to a multicore input optical interface of a second optical splitting device at a lower level; and a multicore output optical interface of every second optical splitting device is connected to the ONT in a one-to-one correspondence.