Optical network system and optical splitting device

Abstract

Provided are an optical network system and an optical splitting device, relating to the technical field of optical communications. The optical network system comprises a measurement device, a first optical splitter and optical filters. The first optical splitter comprises one light input port and N light output ports, N≥2; the light input port of the first optical splitter is connected to the measurement device; N-1 light output ports of the first optical splitter are connected in one-to-one correspondence to inlets of the N-1 optical filters; outlets of the N-1 optical filters are connected to N-1 optical splitting links; and different optical filters are used for selecting to allow optical signals having different wavelengths to pass through. The measurement device is used for sending probing optical signals having different wavelengths to the first optical splitter and receiving probing optical signals returned by at least one optical splitting link. On the basis of the optical network system, the probing optical signals transmitted by the measurement device can respectively enter different optical splitting links, and the probing optical signals returned by the optical splitting links and received by the measurement device can reflect status information of one optical splitting link, thus implementing optical splitting link measurement and acceptance inspection at central offices.

Description

Optical network systems and splitting equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on August 18, 2023, with application number 202311052012.4 and application name “Optical Network System and Splitting Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optical communication technology, and in particular to an optical network system and a light splitting device. Background Art

[0003] A passive optical network (PON) is the primary deployment form of an optical access network. A PON consists of three components: an optical line terminal (OLT), an optical distribution network (ODN), and an optical network terminal (ONT). An ODN consists of multiple fiber optic links, which can be connected via optical fibers using one or more optical splitters. Optical splitters are important passive components in an ODN, capable of splitting and combining optical signals. They are commonly used for optical signal distribution, optical path connection, control of optical signal transmission direction, and coupling control between components.

[0004] A fiber optic splitter box is a device used in fiber optic communication networks to distribute optical fiber signals to different terminal devices. The optical splitter in the fiber optic splitter box is used to split the optical fiber signals. The optical splitter in the fiber optic splitter box can be considered the optical splitter in the ODN that connects to the user-side optical terminal (ONT).

[0005] After deploying the fiber optic splitter box, construction workers need to use an optical time-domain reflectometer (OTDR) to measure the link quality between the fiber optic splitter box and the central office's optical line terminal (OLT). However, using an OTDR requires high technical skills, and manual measurement is also inefficient.

[0006] Summary of the Invention

[0007] The present application provides an optical network system and optical splitting equipment, which are used to solve the problem that the fiber splitter boxes in the optical network system require high technical requirements for acceptance and have low construction efficiency.

[0008] In a first aspect, the present application provides an optical network system, which includes a detection device, a first optical splitter, and an optical filter. The first optical splitter includes an optical input port and N optical output ports, where N≥2. The optical input port of the first optical splitter is connected to the detection device, the N-1 optical output ports of the first optical splitter are connected one-to-one with the input ports of N-1 optical filters, and the output ports of the N-1 optical filters are connected to N-1 optical splitting links, which are used to provide user access. Different optical filters are used to select optical signals of different wavelengths. The detection device is used to send detection optical signals of different wavelengths to the first optical splitter, and to receive detection optical signals returned by at least one optical splitting link.

[0009] It should be understood that because different optical filters are used to select optical signals of different wavelengths, the detection light signal sent by the detection device will only enter one of the N-1 optical splitting links at a time. The detection light signal returned from the optical splitting link received by the detection device can reflect the status information of this optical splitting link. Therefore, the quality of the optical splitting link can be subsequently inspected based on the detection light signal returned by the received optical splitting link. Based on this optical network system, the detection light signal can be emitted at the local end to measure and inspect the quality of the optical splitting link, eliminating the need for manual measurement during network deployment. This reduces the technical requirements for construction personnel and improves the efficiency of network deployment.

[0010] In combination with the first aspect above, as a possible implementation, the detection device is further configured to detect status information of the optical fiber link based on the returned detection optical signal. The status information may include connectivity and link quality of the optical fiber link.

[0011] In conjunction with the first aspect, as a possible implementation, the N optical output ports of the first optical splitter, excluding the N-1 optical output ports, are connected to a splitting link. Alternatively, the N optical output ports of the first optical splitter, excluding the N-1 optical output ports, are connected to the input of an optical filter, and the output of the optical filter is connected to the splitting link.

[0012] In conjunction with the first aspect above, as one possible implementation, at least one optical output port of the third optical splitter is connected to at least one optical reflector, which is configured to connect to at least one ONT. In other words, at least one optical output port of the third optical splitter is connected to the ONT via the optical reflector, which is configured to partially reflect the detection optical signal. Based on this implementation, the addition of the optical reflector enables the detection device to more clearly measure changes in optical power at the third optical splitter.

[0013] In conjunction with the first aspect described above, as a possible implementation, the N optical splitting links connected to the N optical output ports of the first optical splitter include first-type optical splitting links, the multiple second optical splitters in the first-type optical splitting links are first-type second optical splitters, and the first-type second optical splitter includes a first optical output port and multiple second optical output ports. The first optical output port is a cascade interface, and the multiple second optical output ports are used to connect to multiple optical network terminals (ONTs). At least one of the multiple second optical output ports is connected to the inlet of at least one optical reflector, the outlet of the at least one optical reflector is used to connect to at least one ONT, and the optical reflector is used to partially reflect the detection optical signal.

[0014] Based on this solution, the second optical output port of the second optical splitter can serve as a home access interface, allowing users to access the optical network at any optical splitting level in the optical network system, providing a flexible optical access method. Furthermore, the optical reflector allows the detection device to sense changes in the detection signal at the second optical output port, thereby detecting the status of the second optical output port.

[0015] In conjunction with the first aspect described above, as a possible implementation, the N optical splitting links connected to the N optical output ports of the first optical splitter include second-type optical splitting links, the multiple second optical splitters in the second-type optical splitter links are second-type second optical splitters, and the second-type second optical splitter includes a first optical output port and a second optical output port. The first optical output port is a cascade interface, and the second optical output port is connected to the optical input port of a fourth optical splitter. The fourth optical splitter includes multiple optical output ports, at least one optical output port of the fourth optical splitter is connected to the input port of at least one optical reflector, the output port of the at least one optical reflector is used to connect to at least one ONT, and the optical reflector is used to partially reflect the detection optical signal.

[0016] Based on this solution, the fourth optical splitter connected to the second optical output port of the second optical splitter can be used to connect to an ONT, allowing users to access the optical network at any optical splitting level within the optical network system, providing another flexible optical access method. Compared to the previous implementation, this implementation does not require each user to connect to the second optical splitter separately, saving optical fiber. An optical reflector is installed at the output of the fourth optical splitter, allowing detection equipment to sense changes in the optical power of the detection light signal at the fourth optical splitter, thereby measuring and accepting the fourth optical splitter.

[0017] In combination with the first aspect above, as a possible implementation, the N optical splitting links connected to the N optical output ports of the first optical splitter include a third type of optical splitting link, and the multiple second optical splitters of the third type of optical splitter link include a first type of second optical splitter and a second type of second optical splitter. The first type of second optical splitter includes a first optical output port and multiple second optical output ports, and the second type of second optical splitter includes a first optical output port and a second optical output port. The first optical output port of the first type of second optical splitter is a cascade interface, and the multiple second optical output ports of the first type of second optical splitter are used to connect to multiple ONTs. The first optical output port of the second type of second optical splitter is a cascade interface, and the second optical output port of the second type of second optical splitter is connected to a fourth optical splitter. The fourth optical splitter includes multiple optical output ports, at least one optical output port of the fourth optical splitter is connected to the inlet of at least one optical reflector, the outlet of at least one optical reflector is used to connect to at least one ONT, and the optical reflector is used to partially reflect the detection optical signal.

[0018] Based on this solution, the second optical output port of the second optical splitter can be connected to the ONT directly or through the fourth optical splitter. The two implementation methods can be mixed in the optical network system, making the deployment of the optical network system more flexible.

[0019] In combination with the first aspect above, as a possible implementation, the optical network system further includes an OLT and a coupling device, the detection device and the OLT are connected to the optical input port of the first optical splitter through the coupling device, and the optical filter allows the optical signal to be transmitted through the OLT.

[0020] Based on this solution, the detection equipment can be connected to the OLT using a coupling device, making it compatible with the existing PON network.

[0021] In combination with the first aspect above, as a possible implementation, the second optical splitter is an unequal-ratio optical splitter, and the optical power of the first optical output port of the second optical splitter is greater than the optical power of the second optical output port of the second optical splitter.

[0022] In combination with the above first aspect, as a possible implementation manner, the third optical splitter is an equal-splitting optical splitter.

[0023] With reference to the first aspect above, as a possible implementation, the fourth optical splitter is an equal-splitting optical splitter.

[0024] In combination with the above first aspect, as a possible implementation manner, the first optical splitter is an equal-splitting optical splitter.

[0025] In a second aspect, the present application provides a first optical splitter device, which includes a first optical splitter, an input port, N output ports, and at least N-1 optical filters, where N ≥ 2. The input port of the first optical splitter device is connected to the optical input port of the first optical splitter, the first optical splitter includes N optical output ports, and the N optical output ports of the first optical splitter are connected one-to-one with the N output ports of the first optical splitter device. N-1 optical filters are connected in series between the N-1 optical output ports of the first optical splitter and the N-1 output port of the first optical splitter device. Different optical filters are used to select optical signals of different wavelengths.

[0026] In combination with the second aspect, as a possible implementation, an optical filter may be connected in series between another optical outlet of the N optical outlets of the first optical splitter except the N-1 optical outlets and the corresponding output port, or there may be no optical filter connected in series.

[0027] In a third aspect, the present application provides a second optical splitter device, which includes a first type of second optical splitter, an input port, a first output port, multiple second output ports, and at least one optical filter. The input port of the second optical splitter device is connected to the light input port of the first type of second optical splitter. The first type of second optical splitter includes a first light output port and multiple second light output ports, the first light output port of the first type of second optical splitter is connected to the first output port of the second optical splitter device, and the multiple second light output ports of the first type of second optical splitter are connected one-to-one with the multiple second output ports of the second optical splitter device. At least one optical filter is connected in series between at least one second light output port of the first type of second optical splitter and at least one second output port of the second optical splitter device. Different optical filters are used to select optical signals of different wavelengths to pass through.

[0028] In a fourth aspect, the present application provides another second optical splitting device, comprising a second optical splitter of a second type, an input port, a first output port, and a second output port. The input port of the second optical splitter is connected to the optical input port of the first type second optical splitter. The first type second optical splitter comprises a first optical output port and a second optical output port. The first optical output port of the first type second optical splitter is connected to the first output port of the second optical splitter, and a second optical output port of the first type second optical splitter is connected to a second output port of the second optical splitter.

[0029] In a fifth aspect, the present application provides a third optical splitter device, comprising a third optical splitter, an input port, multiple output ports, and at least one optical reflector. The input port of the third optical splitter device is connected to the optical input port of the third optical splitter, and the multiple optical output ports of the third optical splitter are connected in a one-to-one correspondence with the multiple output ports of the third optical splitter device. At least one optical reflector is connected in series between at least one optical output port of the third optical splitter and at least one output port of the third optical splitter device.

[0030] In a sixth aspect, the present application provides a fourth optical splitting device, which may include a fourth optical splitter, an input port, multiple output ports and at least one optical reflector. The light input port of the fourth optical splitter is connected to the input port of the fourth optical splitter device, and the multiple light output ports of the fourth optical splitter are connected one-to-one with the multiple output ports of the fourth optical splitter device. At least one optical reflector is connected in series between at least one light output port of the fourth optical splitter and at least one output port of the fourth optical splitter device.

[0031] In the seventh aspect, the present application provides a fifth optical splitter device, which may include a first optical splitter, a single-core input port, a dual-core output port, and at least one optical filter. The first optical splitter in the fifth optical splitter device is a 1:2 type equal-ratio optical splitter, and the first optical splitter includes two optical output ports. The single-core input port of the first optical splitter device is connected to the optical input port of the first optical splitter, and the two optical output ports of the first optical splitter are connected to a dual-core output port of the first optical splitter device. The dual-core output port has two cores, and the two cores of the dual-core output port correspond one-to-one to the two optical output ports of the first optical splitter. An optical filter is connected in series between at least one optical output port of the first optical splitter and the dual-core output port, and different optical filters are used to select optical signals of different wavelengths to pass through.

[0032] In an eighth aspect, the present application provides a sixth optical splitter device, which may include a first-type second optical splitter, a second-type second optical splitter, a dual-core input port, a dual-core output port, multiple first single-core output ports, and a second single-core output port. The first-type second optical splitter includes a first optical output port and multiple second optical output ports, and the second-type second optical splitter includes a first optical output port and a second optical output port. The first core of the dual-core input port of the sixth optical splitter device is connected to the optical input port of the first-type second optical splitter, and the second core of the dual-core input port of the sixth optical splitter device is connected to the optical input port of the second-type second optical splitter. The first core of the dual-core output port of the sixth optical splitter device is connected to the first optical output port of the first-type second optical splitter, and the second core of the dual-core output port of the sixth optical splitter device is connected to the first optical output port of the second-type second optical splitter. The multiple second optical output ports of the first-type second optical splitter are connected one-to-one with the multiple first single-core output ports of the sixth optical splitter device, and the second optical output port of the first-type second optical splitter is connected to the second single-core output port of the sixth optical splitter device.

[0033] In a ninth aspect, the present application provides a seventh optical splitter device, the seventh optical splitter device comprising a third optical splitter, a dual-core input port, a plurality of first single-core output ports, and a second single-core output port. The first core of the dual-core input port of the seventh optical splitter device is connected to the optical input port of the third optical splitter, the second core of the dual-core input port of the seventh optical splitter device is connected to the second single-core output port, and the plurality of optical output ports of the third optical splitter are connected in a one-to-one correspondence with the plurality of first single-core output ports of the seventh optical splitter device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a schematic diagram of an optical fiber distribution box detected by using an optical power meter according to an embodiment of the present application;

[0035] FIG2 is a schematic diagram of using an OTDR to detect an optical fiber splitter box according to an embodiment of the present application;

[0036] FIG3 is a schematic diagram of the structure of an optical network system provided in an embodiment of the present application;

[0037] FIG4 is a schematic diagram of an optical power variation curve of a detection optical signal provided in an embodiment of the present application;

[0038] FIG5 is a schematic diagram of the structure of another optical network system provided in an embodiment of the present application;

[0039] FIG6 is a schematic diagram of an optical power variation curve of another detection optical signal provided in an embodiment of the present application;

[0040] FIG7 is a schematic diagram of an optical power variation curve of another detection optical signal provided in an embodiment of the present application;

[0041] FIG8 is a schematic diagram of an optical power variation curve of another detection optical signal provided in an embodiment of the present application;

[0042] FIG9 is a schematic diagram showing a comparison between an actual attenuation value and a rated attenuation value of an optical power according to an embodiment of the present application;

[0043] FIG10 is a schematic diagram showing a comparison between an actual attenuation value and a rated attenuation value of another optical power provided in an embodiment of the present application;

[0044] FIG11 is a schematic diagram of an optical power variation curve of another detection optical signal provided in an embodiment of the present application;

[0045] FIG12 is a schematic diagram showing a comparison between an actual value and a theoretical value of a reflection peak height provided in an embodiment of the present application;

[0046] FIG13 is a schematic diagram showing a comparison between actual and theoretical values ​​of another reflection peak height provided in an embodiment of the present application;

[0047] FIG14 is a schematic diagram of the structure of another optical network system provided in an embodiment of the present application;

[0048] FIG15 is a schematic structural diagram of another optical network system provided in an embodiment of the present application;

[0049] FIG16 is a schematic structural diagram of another optical network system provided in an embodiment of the present application;

[0050] FIG17 is a schematic diagram of an optical power variation curve of another detection optical signal provided in an embodiment of the present application;

[0051] FIG18 is a schematic diagram of an optical power variation curve of another detection optical signal provided in an embodiment of the present application;

[0052] FIG19 is a schematic structural diagram of a first optical splitting device provided in an embodiment of the present application;

[0053] FIG20 is a schematic structural diagram of a second optical splitting device provided in an embodiment of the present application;

[0054] FIG21 is a schematic structural diagram of a third optical splitting device provided in an embodiment of the present application;

[0055] FIG22 is a schematic diagram of the structure of another optical network system provided in an embodiment of the present application;

[0056] FIG23 is a schematic structural diagram of another second optical splitting device provided in an embodiment of the present application;

[0057] FIG24 is a schematic structural diagram of a fourth optical splitting device provided in an embodiment of the present application;

[0058] FIG25 is a schematic diagram of the structure of another optical network system provided in an embodiment of the present application;

[0059] FIG26 is a schematic diagram of the structure of another optical network system provided in an embodiment of the present application;

[0060] FIG27 is a schematic structural diagram of a fifth optical splitting device provided in an embodiment of the present application;

[0061] FIG28 is a schematic structural diagram of a sixth optical splitting device provided in an embodiment of the present application;

[0062] FIG29 is a schematic structural diagram of a seventh optical splitting device provided in an embodiment of the present application;

[0063] FIG30 is a schematic structural diagram of another optical network system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] To facilitate understanding, first, a brief introduction is given to the technical terms and related technologies involved in this application.

[0065] In the existing technology, the construction acceptance and fault diagnosis process of the optical fiber splitter box can be as follows:

[0066] 1. Test connectivity: Connect an optical power meter to the end of the fiber optic splitter box (either end) to detect whether there is light at the end. If an optical signal is detected at the end, it can be determined that the optical link from the OLT to the end is connected.

[0067] For example, Figure 1 illustrates a method for testing a fiber optic splitter box using an optical power meter. As shown in Figure 1, a fiber optic splitter box 101 can be connected to an optical line terminal (OLT) 102, and an optical power meter 103 can be connected to port 1 of the fiber optic splitter box 101. When the OLT 102 and the fiber optic splitter box 101 are connected, port 1 of the fiber optic splitter box 101 can receive an optical signal from the OLT 102, and the optical power meter 103 can detect the optical signal.

[0068] After confirming that the fiber optic splitter box is correctly connected to the OLT, you can further measure the link quality.

[0069] 2. Measuring Link Quality: Connect an OTDR to a port on the fiber optic splitter box, turn on the OTDR for testing, and obtain an OTDR curve. The OTDR curve reflects the changes in signal strength during the transmission of the optical signal from the fiber optic splitter box to the OLT. Based on the OTDR curve, you can identify any abnormalities in the optical link. Alternatively, connect an optical power meter to each end of the fiber optic splitter box to measure the optical power of the optical signal received at each end. The optical power measured at each end can be used to calculate the optical signal loss from the OLT to the fiber optic splitter box, thereby determining the quality of the optical link.

[0070] For example, Figure 2 shows a schematic diagram of using an OTDR to inspect a fiber optic splitter box. As shown in Figure 2, a fiber optic splitter box 201 can be connected to an optical line terminal (OLT) 202, and an OTDR 203 can be connected to port 1 of the fiber optic splitter box 201. OTDR 203 can input a probe optical signal into port 1 of the fiber optic splitter box 201. When the OLT 202 and the fiber optic splitter box 201 are connected, the signal sent by OTDR 203 can be transmitted to OLT 202. Consequently, OTDR 203 can obtain an OTDR curve of the probe optical signal's transmission from port 1 of the fiber optic splitter box 201 to the OLT 202, thereby determining the status and quality of the optical link.

[0071] However, using optical power meters and OTDRs to inspect and troubleshoot deployed fiber optic splitter boxes presents the following problems:

[0072] 1. Fiber optic splitter boxes have many terminals, typically 8-32 terminals. If the above method is used for acceptance and fault diagnosis on each terminal, construction efficiency will be very low. In practice, to improve construction efficiency, only one or two terminals in the fiber optic splitter box are typically inspected and fault-diagnosed using the above method. This means that the construction quality of the optical links corresponding to the remaining terminals in the fiber optic splitter box cannot be guaranteed.

[0073] 2. When inspecting and troubleshooting the fiber optic splitter box, on-site operation of related instruments is required, which not only increases the equipment configuration requirements for the construction personnel, but also requires high skills of the construction personnel. Overall, this will increase the construction cost of the fiber optic splitter box.

[0074] This application provides an optical network system and equipment. A detection device is provided on the optical line terminal (OLT) side of the optical network system. Optical filters that pass test signals of different wavelengths are installed at different ends of the primary optical splitter. This allows the detection device to obtain the optical power variation curve of the optical signal during transmission along the branch link corresponding to each end of the primary optical splitter. The optical link quality can then be determined based on the optical power variation curve. This solution eliminates the need for manual testing of optical link quality, effectively improving the deployment efficiency of optical fiber networks and reducing construction costs.

[0075] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Among them, in the description of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship. For example, A / B can represent A or B; "and / or" in the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. Those skilled in the art will understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit differences. At the same time, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way for easy understanding.

[0076] In addition, the network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field can know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0077] Figure 3 is a structural schematic diagram of an optical network system provided by the present application. As shown in Figure 3, the optical network system may include an optical network system including a detection device, a first optical splitter and an optical filter. Among them, the first optical splitter includes an optical input port and N optical output ports, N≥2. The optical input port of the first optical splitter is connected to the detection device, and the N-1 optical output ports of the first optical splitter are connected one-to-one with the input ports of the N-1 optical filters. The outlet of each optical filter is connected to a splitter link, which is used to provide user access. Multiple optical filters are used to select optical signals of different wavelengths. The detection device is used to send detection optical signals of different wavelengths to the first optical splitter, and to receive detection optical signals returned by at least one splitter link.

[0078] Optionally, one optical output port other than the N-1 optical output ports of the first optical splitter may be directly connected to a splitting link.

[0079] Optionally, one of the N optical output ports of the first optical splitter, excluding the N-1 optical output ports, may be connected to an input port of an optical filter, and an output port of the optical filter may be connected to a splitting link. The wavelengths of optical signals allowed to pass by the optical filter and the filters connected to the other optical output ports are different.

[0080] Optionally, as shown in FIG3 , a splitting link may include a plurality of cascaded second optical splitters and a third optical splitter, the first optical splitter being connected to the first-stage second optical splitter in the cascaded plurality of second optical splitters, and the third optical splitter being connected to the last-stage second optical splitter in the cascaded plurality of second optical splitters.

[0081] Optionally, the third optical splitter may include multiple optical output ports, and the multiple optical output ports of the third optical splitter are used to connect to the ONT.

[0082] Optionally, the second optical splitter may include multiple optical output ports, one of the multiple optical output ports serves as a cascade interface, and the other optical output ports serve as inbound interfaces for connecting to the ONT.

[0083] Optionally, as shown in Figure 3 , the optical network system may further include an optical line terminal (OLT), which may be connected to the optical input port of the first optical splitter. Thus, the OLT can communicate with the optical network terminal (ONT) via an optical network device (ODN) consisting of the first, second, and third optical splitters. It should be noted that all optical filters can pass the service optical signals transmitted by the OLT, ensuring normal service transmission.

[0084] As a possible implementation, as shown in Figure 3, the detection device and the OLT can be connected to the optical input port of the first optical splitter via a coupling unit. The optical signals sent by the detection device and the OLT can be transmitted to the first optical splitter via the coupling unit, and the optical signals from the first optical splitter can also be transmitted to the detection device and the OLT via the coupling unit.

[0085] Based on the optical network system shown in FIG3 , this application proposes a method for measuring optical link quality, which can measure and accept the optical network system at the central office. The method may include the following steps:

[0086] Step 1: The detection device emits a detection light signal.

[0087] When the N optical output ports of the first optical splitter are connected to N optical filters, the wavelength of the probe light signal emitted by the detection device can be a wavelength permitted to pass by one of the N optical filters. Consequently, the probe light signal can pass through this one optical filter while being blocked by the other filters, allowing it to enter the optical splitting link connected to this one optical filter. Furthermore, the detection device can receive the probe light signal returned from the optical splitting link connected to this one optical filter.

[0088] For example, assume that the first optical splitter includes four optical output ports, a1, a2, a3, and a4. Optical output port a1 is connected to optical filter b1, optical output port a2 is connected to optical filter b2, optical output port a3 is connected to optical filter b3, and optical output port a4 is connected to optical filter b4. Optical filters b1, b2, b3, and b4 are each connected to a separate optical splitting link. Optical filter b1 allows the passage of optical signals with a wavelength of λ1, optical filter b2 allows the passage of optical signals with a wavelength of λ2, optical filter b3 allows the passage of optical signals with a wavelength of λ3, and optical filter b4 allows the passage of optical signals with a wavelength of λ4. If the detection device emits a probe optical signal with a wavelength of λ1, the probe optical signal will be output from optical output port a1 of the first optical splitter, pass through optical filter b1, and enter the separate optical splitting link connected to optical filter b1. The probe optical signal will be blocked by the other three filters and cannot enter the separate optical splitting links connected to the other three filters.

[0089] When N-1 optical output ports of the first optical splitter are connected to N-1 optical filters, and the other optical output port is not connected to an optical filter, the wavelength of the detection light signal emitted by the detection device can be a wavelength allowed to pass by one of the N-1 optical filters, or a wavelength not allowed to pass by any of the N-1 filters. If the wavelength of the detection light signal is a wavelength allowed to pass by one of the N-1 optical filters, the detection light signal will enter the optical splitting link connected to the optical filter and the optical splitting link connected to the optical output port not connected to the optical filter. If the wavelength of the detection light signal is a wavelength not allowed to pass by any of the N-1 filters, the detection light signal will only enter the optical splitting link connected to the optical output port not connected to the optical filter.

[0090] For example, assume that the first optical splitter includes four optical output ports, a1, a2, a3, and a4. Optical output port a1 is connected to optical filter b1, optical output port a2 is connected to optical filter b2, and optical output port a3 is connected to optical filter b3. Optical filter b1 allows the passage of optical signals with a wavelength of λ1, optical filter b2 allows the passage of optical signals with a wavelength of λ2, and optical filter b3 allows the passage of optical signals with a wavelength of λ3. Optical filters b1, b2, and b3 are each connected to a splitting link, and optical output port a4 is directly connected to a splitting link. If the wavelength of the detection light signal emitted by the detection device is λ1, the detection light signal will be output from optical output port a1 of the first optical splitter, pass through optical filter b1, and enter the splitting link connected to optical filter b1. In addition, since no filter is connected to optical output port a4, the detection light signal will also be input from optical output port a4 and enter the splitting link connected to optical output port a4. If the wavelength of the detection light signal emitted by the detection device is λ4, the optical filters b1, b2 and b3 will block the detection light signal, and the detection light signal will only be output from the optical output port a4 and enter the splitter link connected to the optical output port a4.

[0091] For example, assume that the first optical splitter includes two optical output ports, a1 and a2, and optical output port a1 is connected to optical filter b1. Optical filter b1 is connected to a splitting link, and optical output port a2 is directly connected to a splitting link. The wavelength of the optical signal allowed to pass by optical filter b1 is λ1. If the wavelength of the detection optical signal emitted by the detection device is λ1, then the detection optical signal will be output from optical output port a1 of the first optical splitter, pass through optical filter b1, and enter the splitting link connected to optical filter b1. In addition, since there is no filter connected to optical output port a2, the detection optical signal will also be input from optical output port a2 and enter the splitting link connected to optical output port a2. If the wavelength of the detection optical signal emitted by the detection device is λ2, then optical filter b1 will block the detection optical signal, and the detection optical signal will only be output from optical output port a2 and enter the splitting link connected to optical output port a2.

[0092] It can be seen that if all N optical output ports of the first optical splitter are connected to optical filters, then the detection light signal emitted by the detection device can only enter the optical splitting link connected to one optical output port of the first optical splitter. If one of the N optical output ports is not connected to an optical filter, then the detection light signal emitted by the detection device can enter the optical splitting link connected to at most two optical output ports of the first optical splitter.

[0093] Step 2: The detection device receives the detection optical signal returned from the splitting link.

[0094] It should be understood that the detection light signal will be scattered in the optical fiber, and the backscattered light will be transmitted back to the transmitting end (i.e., the detection device) along the optical fiber, so that the detection device can receive the detection light signal returned in the splitting link. The detection light signal returned to the detection device is actually the backscattered light of the transmitted detection light signal.

[0095] Alternatively, if the probe light signal enters only the splitting link connected to one optical output port of the first optical splitter, the detection device receives the probe light signal returned from this single splitting link. If the probe light signal enters two splitting links connected to two optical output ports of the first optical splitter, the detection device receives the superposition of the probe light signals returned from these two splitting links.

[0096] Step 3: The detection device or controller generates an optical power variation curve based on the detection optical signal returned in the splitting link.

[0097] The detection device can record the signal strength and reception time of the detection optical signal returned from the split optical link.

[0098] Optionally, the detection device may generate a curve showing how the signal strength of the detection light signal changes with the reception time based on this information.

[0099] Optionally, the detection device may report information such as the signal strength and reception time of the detection light signal returned from the received split optical link to the controller, and the controller may generate a curve showing the variation of the signal strength of the detection light signal with the reception time.

[0100] Optionally, the detection device may be an OTDR, and the optical power variation curve generated by the detection device according to the received detection optical signal returned by the split optical link may be an OTDR curve.

[0101] Optionally, if the detection optical signal only enters the split optical link connected to one optical output port of the first optical splitter, the optical power variation curve generated by the detection device or controller is a curve of optical power variation of the detection optical signal transmitted in this split optical link.

[0102] Optionally, if the detection optical signal enters two split optical links connected to the two optical output ports of the first optical splitter, the optical power variation curve generated by the detection device or controller is a superimposed curve of the variation of the detection optical signal transmitted in the two split optical links.

[0103] It should be understood that since the reception time of the probe light signal returned by the splitting link is positively correlated with the distance the probe light signal traveled, the transmission distance of the probe light signal can be calculated based on the reception time. Thus, a curve showing signal strength versus reception time can be converted into a curve showing signal strength versus transmission distance. In the following embodiments of this application, the optical power variation curve of the probe light signal is used as an example to illustrate the curve showing signal strength versus transmission distance.

[0104] Optionally, after the detection optical signal passes through the optical splitter, the optical power of the detection optical signal will be attenuated to a certain extent. Therefore, the optical power variation curve of the detection optical signal will contain an attenuation event corresponding to the optical splitter. The attenuation event refers to an optical power drop step in the optical power variation curve.

[0105] For example, taking the optical network system shown in Figure 3 as an example, assuming that the probe optical signal enters only one optical splitter link from one optical output port of the first optical splitter, a schematic diagram of the optical power variation curve of the probe optical signal can be shown in Figure 4. This optical power variation curve can sequentially include the attenuation events corresponding to a first optical splitter, multiple second optical splitters (labeled second optical splitter_1 to second optical splitter_N in Figure 4), and a third optical splitter. The horizontal axis of the optical power variation curve is the transmission distance of the probe optical signal, and the vertical axis is the optical power of the probe optical signal. The optical power of the probe optical signal attenuates as the transmission distance increases.

[0106] It should be understood that the optical power of the optical signals output from the multiple optical output ports of the optical splitter may vary, but the detection device detects the sum of the optical signals output from each optical output port. Therefore, the optical power value of the detection light signal after passing through the optical splitter detected by the detection device is the maximum optical power value among the optical signals output from each optical output port. Therefore, the attenuation value corresponding to the attenuation event of the optical splitter in the optical power variation curve is the minimum attenuation value of the detection light signal passing through each optical output port.

[0107] Optionally, the second optical splitter in the present application may be an unequal-ratio optical splitter. The cascade interface of the second optical splitter is referred to as the first optical output port, and the other optical output ports are referred to as second optical output ports. The optical power of the first optical output port is greater than the optical power of any of the second optical output ports. Therefore, the attenuation value of the attenuation event corresponding to the second optical splitter in the optical power variation curve is the attenuation value generated by the detection optical signal output from the cascade interface (the first optical output port).

[0108] Step 4: The detection device or controller determines the status information of the optical splitting link according to the optical power variation curve.

[0109] Alternatively, if the probe optical signal enters only the split optical link connected to one optical output port of the first optical splitter, the acquired optical power variation curve can reflect the optical power variation of the probe optical signal transmitted in the split optical link. Thus, the optical power variation curve can be directly used to determine the status information of the split optical link.

[0110] Optionally, if the detection light signal enters the two split links connected to the two optical output ports of the first splitter, the optical power change curve obtained is a superimposed curve of the changes in the detection light signal in the two split links. The optical power value of this optical power change curve is the superimposed value of the power values ​​of the detection light signal in the two split links, and therefore cannot be used to determine the status information of any of the two split links. In this case, the detection device can send another optical signal that only enters one of the two split links to obtain the optical power change curve corresponding to the one split link. Afterwards, based on the superimposed curve of the changes in the measurement signal in the two split links and the optical power change curve of the detection light signal in one of the split links, the optical power change curve of the detection light signal in the other split link is calculated.

[0111] For example, Figure 5 is a schematic diagram of an optical network system in which a detection device is connected to the optical input port of a first optical splitter. The first optical splitter includes two optical output ports, A and B. Optical output port A of the first optical splitter is connected to the input port of an optical filter, the output port of the optical filter is connected to the optical input port of a second optical splitter_1, one optical output port of the second optical splitter_1 is connected to the optical input port of a second optical splitter_2, one optical output port of the second optical splitter_2 is connected to the optical input port of a second optical splitter_3, and one optical output port of the second optical splitter_3 is connected to the optical input port of a third optical splitter_1. Optical output port B of the first optical splitter is directly connected to the optical input port of a second optical splitter_4, one optical output port of the second optical splitter_4 is connected to the optical input port of a second optical splitter_5, one optical output port of the second optical splitter_5 is connected to the optical input port of a second optical splitter_6, and one optical output port of the second optical splitter_6 is connected to the optical input port of a third optical splitter_2. The optical filter allows the optical signal wavelength to pass through to be λA. The distances of the second and third optical splitters from the first optical splitter are, from closest to farthest, second optical splitter_1, second optical splitter_4, second optical splitter_2, second optical splitter_5, second optical splitter_3, second optical splitter_6, third optical splitter_1, and third optical splitter_2.

[0112] Taking the optical network system shown in Figure 5 as an example, if the detection device sends a probe optical signal with a wavelength of λA, the probe optical signal will be output from the optical output port A of the first optical splitter and transmitted to the third optical splitter_1. The probe optical signal will also be output from the optical output port B of the first optical splitter and transmitted to the third optical splitter_2. The optical power change curve of the probe optical signal with a wavelength of λA obtained by the detection device can be shown in Figure 6. This optical power change curve includes multiple attenuation events, which can correspond to the first optical splitter, the second optical splitter_1, the second optical splitter_4, the second optical splitter_2, the second optical splitter_5, the second optical splitter_3, the second optical splitter_6, the third optical splitter_1, and the third optical splitter_2 in sequence. The optical power value at each position in this optical power change curve is the superposition value of the probe optical signal in the branch links corresponding to the two optical output ports of the first optical splitter. This optical power change curve cannot be used to determine the status information of any of the branch links corresponding to the two optical output ports.

[0113] Taking the optical network system shown in Figure 5 as an example, if the detection device sends a detection optical signal with a wavelength of λB, the optical splitter connected to the optical output port A of the first optical splitter cannot pass the detection optical signal, so the detection optical signal will only be output from the optical output port B of the first optical splitter and transmitted to the third optical splitter_2. The optical power change curve of the wavelength λB obtained by the detection device can be shown in Figure 7. This optical power change curve includes multiple attenuation events, and the multiple attenuation events can correspond to the first optical splitter, the second optical splitter_4, the second optical splitter_5, the second optical splitter_6, and the third optical splitter_2 in sequence. The positions of the same optical splitters in Figure 7 and Figure 6 are the same. This optical power change curve reflects the optical power change of the detection optical signal during the process of being output from the optical output port B of the first optical splitter and transmitted to the third optical splitter_2. Therefore, it can be used to determine the status information of the branch link corresponding to the optical output port B of the first optical splitter.

[0114] In the embodiment of the present application, the optical power variation curve for the wavelength λA shown in FIG6 and the optical power variation curve for the wavelength λB shown in FIG7 can be combined to calculate the optical power variation curve corresponding to the detection light signal being output from the optical output port A of the first optical splitter and transmitted to the third optical splitter_1. Here, the optical power variation curve corresponding to the detection light signal being output from the optical output port A of the first optical splitter and transmitted to the third optical splitter_1 = the optical power variation curve for the wavelength λA shown in FIG6 - the optical power variation curve for the wavelength λB shown in FIG7.

[0115] For example, the optical power variation curve corresponding to the detection light signal output from the optical output port A of the first optical splitter and transmitted to the third optical splitter_1 can be shown in Figure 8. This optical power variation curve includes multiple attenuation events, which can correspond to the first optical splitter_1, the second optical splitter_2, the second optical splitter_3, and the third optical splitter_1 in sequence. The positions of the same optical splitters in Figure 8 and Figure 6 are the same.

[0116] Optionally, the status information of the split optical link may include the connectivity status and link quality of the link in the split optical link.

[0117] Optionally, the detection device or controller can obtain the topology of the split optical link. Based on this, the detection device or controller can determine the connectivity of the link in the split optical link based on the correspondence between the location of the attenuation event in the optical power variation curve and the location of the optical splitter in the split optical link. For example, if there is an optical link after the optical splitter corresponding to the last attenuation event in the optical power variation curve, but the optical power variation curve has stopped, then the split optical link is disconnected at this location.

[0118] Optionally, the attenuation of the optical signal passing through the optical splitter may have a rated value, and the rated value may be measured when the optical splitter leaves the factory. The present application may compare the attenuation value of the optical splitter measured by the detection device with the rated attenuation value of the optical splitter to determine the link quality. Among them, the attenuation value of the attenuation event corresponding to the optical splitter in the optical power change curve of the detected optical signal is the attenuation value of the optical splitter measured by the detection device. It should be understood that if the attenuation value of the optical splitter measured by the detection device is greater than the rated attenuation value of the optical splitter, it means that the link connection at the optical splitter is abnormal, resulting in a large loss of optical power. In the embodiment of the present application, the first optical splitter, the second optical splitter and the third optical splitter can all be judged in this way, which is uniformly described here.

[0119] As one possible implementation, if the difference between the attenuation value of the first optical splitter measured by the detection device and the rated attenuation value of the first optical splitter exceeds a first threshold, it can be determined that a link fault exists at the first optical splitter. If the difference between the attenuation value of the first optical splitter measured by the detection device and the rated attenuation value of the first optical splitter does not exceed the first threshold, it can be determined that this is normal fluctuation in network configuration. The first threshold can be considered a fluctuation range reserved for the first optical splitter's network configuration.

[0120] As one possible implementation, if the difference between the attenuation value of the second optical splitter measured by the detection device and the rated attenuation value of the second optical splitter exceeds a second threshold, a link fault at the second optical splitter can be determined. If the difference between the actual attenuation value of the second optical splitter measured by the detection device and the rated attenuation value of the second optical splitter does not exceed the second threshold, it can be considered normal fluctuation in network configuration. The second threshold can be considered a fluctuation range reserved for the second optical splitter configuration.

[0121] As a possible implementation, if the difference between the attenuation value of the third optical splitter measured by the detection device and the rated attenuation value of the third optical splitter exceeds a third threshold, it can be determined that a link fault exists at the third optical splitter. If the difference between the attenuation value of the third optical splitter measured by the detection device and the rated attenuation value of the third optical splitter does not exceed the third threshold, it can be determined that this is normal fluctuation in network configuration. The third threshold can be considered a fluctuation range reserved for the third optical splitter's networking.

[0122] For example, Figure 9 shows a comparison of measured attenuation values ​​with rated attenuation values. The rated attenuation value of the splitter is x1, and the measured attenuation value is x2. W1 is the fluctuation range reserved for splitter networking. In Figure 9, x2 is greater than x1, but the value by which x2 exceeds x1 does not exceed W1. Therefore, the splitter's attenuation value is considered to be within normal networking fluctuations, and the splitter is operating normally.

[0123] As another example, Figure 10 shows another comparison of measured attenuation values ​​with rated attenuation values. The rated attenuation value of the splitter is x1, and the measured attenuation value is x2. W1 is the fluctuation range reserved for splitter networking. In Figure 10, if x2 is greater than x1, and the value of x2 exceeding x1 exceeds W1, it can be considered that the splitter has an attenuation fault.

[0124] Alternatively, the optical splitter corresponding to the attenuation values ​​shown in Figures 9 and 10 may be the first optical splitter, and W1 may be the first threshold. Alternatively, the optical splitter corresponding to the attenuation values ​​shown in Figures 9 and 10 may be the second optical splitter, and W1 may be the second threshold. Alternatively, the optical splitter corresponding to the attenuation values ​​shown in Figures 9 and 10 may be the third optical splitter, and W1 may be the third threshold.

[0125] Generally, if the actual attenuation value of the optical splitter (eg, the first optical splitter, the second optical splitter, or the third optical splitter) through which the detection optical signal passes exceeds the threshold range, it may be that the insertion loss of the optical splitter is large, resulting in abnormal optical power attenuation.

[0126] Alternatively, if abnormal attenuation events occur at other locations in the optical power variation curve in addition to the attenuation event corresponding to the optical splitter, it can be determined that a fault exists at the location where the abnormal attenuation event occurred. For example, referring to FIG4 , assuming that other abnormal attenuation events occur before the attenuation event corresponding to the first optical splitter, it can be determined that a fault exists at the location in the optical link corresponding to the abnormal attenuation event before the first optical splitter.

[0127] Based on the above method, first, the attenuation event corresponding to the optical splitter in the optical power variation curve can be used to determine whether the optical link at the optical splitter is faulty. Second, the presence of abnormal attenuation events outside the optical splitter can be used to determine whether a location outside the optical splitter is faulty. Thus, the status of the split optical link can be determined based on the optical power variation curve.

[0128] In an embodiment of the present application, the detection device can send detection optical signals of different wavelengths to obtain the optical power change curve of the detection optical signal transmitted from the optical splitting links corresponding to each optical output port of the first optical splitter. Thus, the status information of each optical splitting link can be determined based on the optical power change curve of each optical splitting link. By measuring each branch link in the optical network system, the measurement of the entire optical network system can be achieved. Based on the link quality measurement method of the present application, the measurement and acceptance of each optical splitting link in the optical network system can be achieved at the local end, which is more automated. Compared with manual measurement and acceptance, this solution is more efficient.

[0129] Optionally, at least one of the multiple light output ports of the third optical splitter is connected to at least one optical reflector, and the at least one optical reflector is used to connect to at least one ONT. In other words, the at least one light output port of the third optical splitter can be connected to the at least one ONT via the optical reflector. The optical reflector can partially reflect the detection light signal. It should be understood that because the third optical splitter is located at the end of the optical link, the optical power of the detection light signal reflected by the third optical splitter that can be detected by the detection device is relatively weak. Providing an optical reflector at the light output port of the third optical splitter can enhance the optical power perceived by the detection device at the third optical splitter.

[0130] Optionally, when a light reflector is connected to the light output port of the first beam splitter, a reflection event corresponding to the light reflector may be present in the optical power variation curve of the detection light signal obtained by the detection device. A reflection event is reflected as a reflection peak in the optical power variation curve. In this application, the terms "reflection event" and "reflection peak" are interchangeable and are used interchangeably here.

[0131] For example, Figure 11 is a schematic diagram of another optical power change curve of a detection optical signal. The optical power change curve is similar to the optical power change curve shown in Figure 4, except that there is a reflection event in addition to the attenuation event at the location of the third optical splitter. As shown in Figure 11, the optical power change of the optical detection optical signal at the third optical splitter first increases to form a reflection peak, and then decreases. The optical power value after the decrease is smaller than the optical power value before the reflection peak. This is because the optical reflector set at the light outlet of the third optical splitter reflects the detection optical signal, which increases the optical power sensed by the detection device at the third optical splitter, thereby forming a reflection peak. However, after the detection optical signal passes through the third optical splitter and the optical reflector, there is no gain from the optical reflector and it has been split by the third optical splitter, so that the optical power attenuation is lower than before the reflection peak. The attenuation events at other positions in Figure 11 are the same as those in Figure 4 and will not be repeated here.

[0132] The height of the reflection peak is related to the loss of the entire optical link from the detection device to the optical reflector, which may include the loss of the optical fiber link and the loss of the preceding devices (such as the first optical splitter, the second optical splitter, and the third optical splitter). Therefore, the height of the reflection peak can be used as a criterion for the loss status of the optical fiber link and devices preceding the optical reflector.

[0133] For example, the total loss of the optical reflector when the probe light signal is transmitted to the third optical splitter can be calculated based on the height of the reflection peak. The loss of the probe light signal in the optical fiber and the loss of the optical splitter before the probe light signal passes through the total loss can then be subtracted from the total loss to obtain the loss at the third optical splitter. For example, the total loss of the optical reflector when the probe light signal is transmitted to the third optical splitter = optical fiber loss + loss of the first optical splitter + loss of the second optical splitter + loss of the third optical splitter. Then, the loss of the third optical splitter = total loss of the optical reflector when the probe light signal is transmitted to the third optical splitter - (optical fiber loss + loss of the first optical splitter + loss of the second optical splitter). Here, optical fiber loss = optical fiber length * optical attenuation coefficient. The loss of the first optical splitter and the loss of the second optical splitter can be measured beforehand.

[0134] The optical reflector has a rated reflectivity when it leaves the factory, so the theoretical value of the reflection peak height can be calculated based on the rated reflectivity. Furthermore, the present application can compare the actual measured reflection peak height with the theoretical value of the reflection peak height to determine whether there is a fault in the optical link before the optical reflector set at the light outlet of the third optical splitter. As a possible implementation method, when the difference between the actual measured reflection peak height and the theoretical value of the reflection peak height exceeds a fourth threshold, it can be considered that there is a fault in the optical link before the optical reflector set at the light outlet of the third optical splitter. When the difference between the actual measured reflection peak height and the theoretical value of the reflection peak height does not exceed the fourth threshold, it can be considered that there is no fault in the optical link before the optical reflector. The setting of the fourth threshold takes into account the normal loss of the optical link before the optical reflector, such as the normal insertion loss of the equipment in the previous optical link and the normal loss of the optical fiber.

[0135] For example, Figure 12 shows a comparison between the actual and theoretical values ​​of a reflection peak height. The theoretical value of the reflection peak height is y1, and the measured reflection peak height is y2. R1 is the fluctuation range reserved for optical reflector networking, and R1 takes into account the normal insertion loss of the equipment before the optical reflector. In Figure 12, y2 is less than y1, but the amount by which y2 is less than y1 does not exceed R1, indicating that the optical link before the optical reflector is normal.

[0136] As another example, Figure 13 shows a comparison of actual and theoretical reflection peak heights. The theoretical reflection peak height is y1, and the measured reflection peak height is y2. R1 is the fluctuation range reserved for optical reflector networking, which accounts for the normal insertion loss of the equipment preceding the optical reflector. In Figure 13, y2 is less than y1, but the amount by which y2 is less than y1 exceeds R1, indicating a fault in the optical link preceding the optical reflector.

[0137] Optionally, the type of the second optical splitter may include a first type and a second type, the first type of second optical splitter includes multiple second optical output ports, and the second type of second optical splitter includes one second optical output port. For the first type of second optical splitter, the output optical power of one first optical output port may account for A% of the input optical power of the optical splitter, and the sum of the output optical powers of multiple second optical output ports may account for B% of the input optical power of the optical splitter, where A and B are positive numbers, and A>B. As a possible implementation, the output optical powers of the multiple second optical output ports may be evenly divided, and the output optical power of each second optical output port may be M is the number of second optical output ports. For a second optical splitter of the second type, the output optical power of one first optical output port accounts for A% of the input optical power of the optical splitter, and the output optical power of one second optical output port accounts for B% of the input optical power of the optical splitter. For example, A = 80, B = 20; or A = 70, B = 30; or A = 60, B = 40.

[0138] As a possible implementation method, the N optical splitting links corresponding to the N optical output ports of the first optical splitter may include a first type of optical splitting link, and the second optical splitters in the first type of optical splitting link are all of the first type. By way of example, Figure 14 shows a structural schematic diagram of another optical network system, which includes a first type of optical splitting link. Among them, the first optical output port of each second optical splitter serves as a cascade interface, and the multiple second optical output ports of each second optical splitter are used to connect to multiple ONTs. It should be understood that the connection relationship between the detection device, optical filter, first optical splitter, second optical splitter, and third optical splitter in Figure 14 can refer to the relevant description of Figure 3 and will not be repeated here.

[0139] Optionally, in FIG14 , at least one second light output port of the first type second optical splitter is connected to an inlet of at least one optical reflector, and the outlet of the at least one optical reflector is used to connect to at least one ONT. In other words, the at least one second light output port of the first type second optical splitter is connected to the ONT via the optical reflector.

[0140] As a possible implementation, the N optical splitting links corresponding to the N optical output ports of the first optical splitter may include a second type of optical splitting link, and the second optical splitters in the second type of optical splitting link may all be of the second type. For example, Figure 15 shows a structural schematic diagram of another optical network system, which includes a second type of optical splitting link. Among them, the first optical output port of each second optical splitter serves as a cascade interface, the second optical output port of each second optical splitter is connected to the optical input port of the fourth optical splitter, and the multiple optical output ports of the fourth optical splitter are used to connect to multiple ONTs. At least one optical output port of the fourth optical splitter is connected to the inlet of at least one optical reflector, and the outlet of at least one optical reflector is used to connect to at least one ONT. In other words, at least one optical output port of the multiple optical output ports of the fourth optical splitter is connected to at least one ONT through an optical reflector. The connection relationship between the detection device, optical filter, first optical splitter, second optical splitter and third optical splitter in Figure 15 can refer to the relevant description of Figure 3 and will not be repeated here.

[0141] As a possible implementation, the N optical splitting links corresponding to the N optical output ports of the first optical splitter may include a third type of optical splitting link, and the third type of optical splitting link may include a first type second optical splitter and a second type second optical splitter. By way of example, Figure 16 shows a structural schematic diagram of another optical network system, which includes a third type of optical splitting link. The first optical output port of the first type second optical splitter serves as a cascade interface, and the multiple second optical output ports of the first type second optical splitter are used to connect to multiple ONTs. In addition, the first optical output port of the second type second optical splitter serves as a cascade interface, and the second optical output port of the second type second optical splitter is connected to the optical input port of a fourth optical splitter, and the multiple optical output ports of the fourth optical splitter are used to connect to multiple ONTs. At least one optical output port of the fourth optical splitter is connected to the inlet port of at least one optical reflector, and the outlet port of at least one optical reflector is used to connect to at least one ONT. In other words, at least one optical output port of the multiple optical output ports of the fourth optical splitter is connected to at least one ONT through an optical reflector.

[0142] Optionally, in FIG16 , at least one second light output port of the first type second optical splitter is connected to an inlet of at least one optical reflector, and the outlet of the at least one optical reflector is used to connect to at least one ONT. In other words, the at least one second light output port of the first type second optical splitter is connected to the ONT via the optical reflector.

[0143] In the embodiment of the present application, the multiple optical splitting links corresponding to the multiple optical output ports of the first optical splitter may include at least one of the first type of optical splitting links, the second type of optical splitting links, or the third type of optical splitting links, which are explained here.

[0144] Optionally, if the detection light signal enters the first type of splitting link from the light outlet of the first optical splitter, and the second light outlet of the first type of the second optical splitter in the first type of splitting link is not connected to an optical reflector. Then, the optical power change curve of the detection light signal can be as shown in Figure 4. The attenuation value of the attenuation event corresponding to the second optical splitter in the optical power change curve is the attenuation value generated when the detection light signal is output from the first light outlet of the second optical splitter. The optical power change curve does not reflect the attenuation of the detection light signal output from the second light outlet. However, the output optical power of the first light outlet and the second light outlet of the second optical splitter are proportional. The present application can estimate the attenuation generated from the light input port to the second light outlet based on the attenuation generated from the light input port to the first light outlet. Furthermore, the actual attenuation value of the second light outlet can be compared with the rated attenuation value to determine the link quality from the light input port to the second light outlet.

[0145] Optionally, if the detection light signal enters the first type of splitting link from the light outlet of the first optical splitter, and at least one second light outlet of the first type of second optical splitter in the first type of splitting link is connected to at least one optical reflector. Then, the optical power change curve of the detection light signal can be shown in Figure 17. Compared with the optical power change curve shown in Figure 4, the position where the second optical splitter is located includes not only attenuation events but also reflection events. As shown in Figure 17, the optical power change of the detection light signal at the second optical splitter first increases to form a reflection peak and then decreases. The optical power value after the decrease is smaller than the optical power value before the reflection peak. This is because the optical reflector set at the second light outlet of the second optical splitter increases the optical power at the second optical splitter, but the overall optical power of the detection light signal after passing through the second optical splitter is attenuated. The attenuation events corresponding to the first optical splitter and the third optical splitter in Figure 17 can refer to the relevant description in Figure 4, which will not be repeated here.

[0146] As explained above, the height of the reflection peak corresponding to the optical reflector at the second optical output port of the second optical splitter is related to the loss of the optical link preceding the reflector. The height of the reflection peak can be used as a criterion for determining the loss status of the optical fiber link and equipment preceding the optical reflector.

[0147] Alternatively, the total loss of the optical reflector transmitted to the second optical splitter_x can be calculated based on the height of the reflection peak. The total loss can then be subtracted from the loss of the optical fiber and the loss of the optical splitter before the probe light signal passes through the probe light signal, thereby obtaining the loss of the probe light signal passing through the second optical splitter_x. For example, the total loss of the optical reflector transmitted to the second optical splitter_x = optical fiber loss + loss of the first optical splitter + loss of the second optical splitter_1 + ... + loss of the second optical splitter_x. Therefore, the loss of the second optical splitter_x = total loss of the optical reflector transmitted to the second optical splitter_x - (optical fiber loss + loss of the first optical splitter + loss of the second optical splitter_1 + ... + loss of the second optical splitter_x-1). Fiber loss = fiber length * optical attenuation coefficient. The loss of the first optical splitter and the loss from the second optical splitter_1 to the second optical splitter_x-1 can be measured previously.

[0148] Optionally, the light outlet of the third optical splitter connected to the first type of optical splitting link in Figure 14 may also be provided with an optical reflector. In this case, the attenuation event corresponding to the third optical splitter in Figure 17 may also be preceded by a reflection event. In this case, the change in the optical power variation curve at the third optical splitter can be referred to as shown in Figure 11 and will not be repeated here.

[0149] Optionally, if the detection optical signal enters the second type of splitting link from the optical outlet of the first optical splitter, the optical power change curve of the detection optical signal can be as shown in Figure 18. There will still be a reflection event at a certain distance after the second optical splitter, and the reflection event is generated by the optical reflector set at the optical outlet of the fourth optical splitter connected to the second optical splitter. The distance between the reflection event generated by the optical reflector set at the optical outlet of the fourth optical splitter in the optical power change curve and the attenuation event corresponding to the second optical splitter is related to the distance between the fourth optical splitter and the second optical splitter connected to it. Normally, the distance between the second optical splitter and the fourth optical splitter connected to it is closer than the distance between the second optical splitter and the second optical splitter or the third optical splitter of the next level. Therefore, the position of the reflection event generated by the optical reflector connected to the fourth optical splitter is between the attenuation event of the second optical splitter and the attenuation event of the second optical splitter of the next level, or between the attenuation event of the second optical splitter and the attenuation event of the third optical splitter. For example, as shown in Figure 18, a reflection event occurs between the attenuation event corresponding to the second optical splitter_1 and the attenuation event corresponding to the second optical splitter_2 in the optical power variation curve. This reflection event is caused by the optical reflector provided at the light outlet of the fourth optical splitter_1 connected to the second optical splitter_1. A reflection event also occurs between the attenuation event corresponding to the second optical splitter_N and the attenuation event corresponding to the third optical splitter in the optical power variation curve. This reflection event is caused by the optical reflector provided at the light outlet of the fourth optical splitter_N connected to the second optical splitter_N.

[0150] It should be understood that the optical power variation curve does not reflect the attenuation of the detection optical signal output from the second optical output port of the second optical splitter. Therefore, it is impossible to detect the optical link of the fourth optical splitter by the attenuation of optical power. The present application sets an optical reflector at the optical output port of the fourth optical splitter, so that the detection equipment can detect the optical power gain brought by the reflector. Furthermore, the quality of the optical link before the fourth optical splitter can be determined based on the height of the reflection peak corresponding to the optical reflector set at the optical output port of the fourth optical splitter.

[0151] Alternatively, the total loss of the optical reflector transmitted to the fourth optical splitter_x can be calculated based on the height of the reflection peak. The total loss can then be subtracted from the loss of the optical fiber and the loss of the optical splitter before the probe light signal passes through it, thereby obtaining the loss of the probe light signal passing through the fourth optical splitter_x. The fourth optical splitter_x is the fourth optical splitter connected to the second optical output port of the second optical splitter_x. For example, the total loss of the optical reflector transmitted to the fourth optical splitter_x = the optical fiber loss + the loss of the first optical splitter + the loss of the second optical splitter_1 + ... + the loss of the second optical splitter_x + the loss of the fourth optical splitter_x. Therefore, the loss of the fourth optical splitter_x = the total loss of the optical reflector transmitted to the fourth optical splitter_x - (the optical fiber loss + the loss of the first optical splitter + the loss of the second optical splitter_1 + ... + the loss of the second optical splitter_x). Fiber loss = fiber length * optical attenuation coefficient. The loss of the first optical splitter and the loss from the second optical splitter_1 to the second optical splitter_x can be measured beforehand.

[0152] Optionally, the light outlet of the third optical splitter connected to the second type of optical splitting link in Figure 15 may also be provided with an optical reflector. In this case, the attenuation event corresponding to the third optical splitter in Figure 18 may also be preceded by a reflection event. In this case, the change in the optical power variation curve at the first optical splitter can be referred to as shown in Figure 11 and will not be repeated here.

[0153] Optionally, if the detection optical signal passes through the branch link where the third type of splitting link is located, then the first type of second optical splitter corresponds to an attenuation event in the optical power variation curve, for which reference may be made to the attenuation event corresponding to the second optical splitter in FIG17 . The second type of second optical splitter and the fourth optical splitter connected thereto correspond to an attenuation event and a reflection event in the optical power variation curve, for which reference may be made to the attenuation event corresponding to the second optical splitter and the reflection event corresponding to the fourth optical splitter in FIG18 . This application will not elaborate further.

[0154] Optionally, the light outlet of the third optical splitter to which the third type of optical splitting link in FIG16 is connected may also be provided with a light reflector.

[0155] Optionally, the first optical splitter, the third optical splitter, and the fourth optical splitter in the embodiment of the present application may be equal-ratio optical splitters, and may include N equal-ratio optical output ports, the output optical power of each optical output port being % of the input optical power. N≥2. The N optical output ports of the first optical splitter are all used to cascade the second optical splitter of the lower level. The optical signal received by the first optical splitter from the optical input port is split in equal proportions and then flows to the lower-level optical splitter cascaded with the N optical output ports. Exemplarily, the first optical splitter can be a 1:2 type equal-ratio optical splitter, including 1 optical input port and 2 equal-ratio optical output ports. The N optical output ports of the third optical splitter and the fourth optical splitter are all used to connect to the ONT. The optical signal received by the third optical splitter and the fourth optical splitter from the optical input port is split in equal proportions and then flows to the ONT connected to the N optical output ports. Exemplarily, the first optical splitter can be a 1:8 type equal-ratio optical splitter, including 1 optical input port and 8 equal-ratio optical output ports.

[0156] Optionally, the optical filter in the embodiment of the present application can be a reflective optical filter or a transmissive optical filter, which is not limited in the present application. In the case where the optical filter is a transmissive optical filter, the transmissive optical filters connected to different light outlets of the first optical splitter can transmit detection light signals of different wavelengths. In the case where the optical filter is a reflective optical filter, the reflective optical filters connected to different light outlets of the first optical splitter reflect detection light signals of specific wavelengths, so that different reflective optical filters can pass through different wavelengths of detection light signals, achieving the same effect as a transmissive optical filter.

[0157] The above embodiments introduce the optical network system and optical link quality detection method provided by this application. Next, the specific implementation form of the equipment in the optical network system and the optical network system based on the specific deployment of optical network equipment will be introduced.

[0158] Optionally, the optical splitter in the above optical network system of the present application and the filter or reflector connected to its optical outlet can be integrated into the optical splitting device, so that the deployment of the above optical network system can be achieved by connecting different optical splitting devices.

[0159] For example, Figure 19 is a schematic structural diagram of a first optical splitter device provided in the present application. As shown in Figure 19, the first optical splitter device includes a first optical splitter, an input port, N output ports, and at least N-1 optical filters, where N≥2. The input port of the first optical splitter device is connected to the optical input port of the first optical splitter, the first optical splitter includes N optical output ports, and the N optical output ports of the first optical splitter are connected one-to-one with the N output ports of the first optical splitter device. N-1 optical filters are connected in series between the N-1 optical output ports of the first optical splitter and the N-1 output port of the first optical splitter device. Different optical filters are used to select optical signals of different wavelengths to pass through.

[0160] Optionally, in the first optical splitting device shown in FIG19 , an optical filter may be connected in series between another optical output port of the first optical splitter other than the N-1 optical output ports and the corresponding output port, or an optical filter may not be connected in series. Both implementation structures are protected by this application and are described herein.

[0161] For example, Figure 20 is a structural schematic diagram of a second optical splitter device provided by the present application. As shown in Figure 20, the second optical splitter device includes a first type of second optical splitter, an input port, a first output port, multiple second output ports, and at least one optical filter. The input port of the second optical splitter device is connected to the light input port of the first type of second optical splitter. The first type of second optical splitter includes a first light output port and multiple second light output ports. The first light output port of the first type of second optical splitter is connected to the first output port of the second optical splitter device, and the multiple second light output ports of the first type of second optical splitter are connected one-to-one with the multiple second output ports of the second optical splitter device. At least one optical filter is connected in series between at least one second light output port of the first type of second optical splitter and at least one second output port of the second optical splitter device. Different optical filters are used to select optical signals of different wavelengths to pass through.

[0162] For example, FIG21 is a schematic diagram of the structure of a third optical splitter device provided by the present application. As shown in FIG21, the third optical splitter device includes a third optical splitter, an input port, multiple output ports, and at least one optical reflector. The input port of the third optical splitter device is connected to the light input port of the third optical splitter, and the multiple light output ports of the third optical splitter are connected one-to-one with the multiple output ports of the third optical splitter device. At least one optical reflector is connected in series between at least one light output port of the third optical splitter and at least one output port of the third optical splitter device.

[0163] Optionally, as shown in Figure 22, one output port of the first optical splitter device shown in Figure 19 is connected to multiple cascaded second optical splitters shown in Figure 20, and the multiple second optical splitters shown in Figure 20 are cascaded through the first output port. Furthermore, the first output port of the last-stage second optical splitter device shown in Figure 20 is connected to the third optical splitter device shown in Figure 21. Thus, the first type of optical splitter link in the optical network system shown in Figure 14 can be deployed and implemented. The second output port of the second optical splitter device shown in Figure 20 and the output port of the third optical splitter device shown in Figure 21 can be used to connect to an ONT.

[0164] For example, FIG23 is a schematic structural diagram of another second optical splitting device provided by the present application. As shown in FIG23, the second optical splitting device includes a second optical splitter of a second type, an input port, a first output port, and a second output port. The input port of the second optical splitter is connected to the light input port of the first type second optical splitter. The first type second optical splitter includes a first light output port and a second light output port. The first light output port of the first type second optical splitter is connected to the first output port of the second optical splitter, and a second light output port of the first type second optical splitter is connected to a second output port of the second optical splitter.

[0165] For example, Figure 24 is a structural schematic diagram of a fourth spectrometer device provided in the present application. The fourth spectrometer device may include a fourth spectrometer, an input port, multiple output ports and at least one optical reflector. The light input port of the fourth spectrometer is connected to the input port of the fourth spectrometer device, and the multiple light output ports of the fourth spectrometer are connected one-to-one with the multiple output ports of the fourth spectrometer device. At least one optical reflector is connected in series between at least one light output port of the fourth spectrometer and at least one output port of the fourth spectrometer device.

[0166] Optionally, as shown in Figure 25, one output port of the first optical splitting device shown in Figure 19 is connected to a plurality of cascaded second optical splitting devices shown in Figure 23, and the plurality of second optical splitting devices shown in Figure 23 are cascaded through the first output port. Furthermore, the first output port of the second optical splitting device shown in Figure 23 of the last stage is connected to the third optical splitting device shown in Figure 21. Furthermore, the second output port of each second optical splitting device shown in Figure 23 is connected to the fourth optical splitting device shown in Figure 24. Thus, the second type of optical splitting link in the optical network system shown in Figure 15 can be deployed and implemented. Among them, the output port of the fourth optical splitting device shown in Figure 24 and the output port of the third optical splitting device shown in Figure 21 can be used to connect to the ONT.

[0167] Optionally, as shown in Figure 26, one output port of the first optical splitter device shown in Figure 19 is connected to a plurality of cascaded second optical splitters, the plurality of cascaded second optical splitters may include the second optical splitter device shown in Figure 20 and the second optical splitter device shown in Figure 23, and the plurality of second optical splitters are cascaded through the first output port. Furthermore, the second output port of the second optical splitter device shown in Figure 23 is connected to the fourth optical splitter device shown in Figure 24. In addition, the first output port of the last second optical splitter device in the cascade of second optical splitters is connected to the third optical splitter device shown in Figure 21. Thus, a third type of optical splitting link in the optical network system shown in Figure 16 can be deployed and implemented. Among them, the second output port of the second optical splitter device shown in Figure 20, the output port of the third optical splitter device shown in Figure 21, and the output port of the fourth optical splitter device shown in Figure 24 can be used to connect to an ONT.

[0168] The above Figures 19, 20, 21, 23 and 24 are based on the example of each splitter being a separate optical splitting device. In some possible situations, multiple splitters can be networked in the same device to still form an optical network system.

[0169] For example, Figure 27 shows a schematic structural diagram of a fifth optical splitter device. As shown in Figure 27, the fifth optical splitter device may include a first optical splitter, a single-core input port, a dual-core output port, and at least one optical filter. The first optical splitter in the fifth optical splitter device is a 1:2 type equal-ratio optical splitter, and the first optical splitter includes two optical output ports. The single-core input port of the first optical splitter device is connected to the optical input port of the first optical splitter, and the two optical output ports of the first optical splitter are connected to a dual-core output port of the first optical splitter device. The dual-core output port has two cores, and the two cores of the dual-core output port correspond one-to-one to the two optical output ports of the first optical splitter. An optical filter is connected in series between at least one optical output port of the first optical splitter and the dual-core output port, and different optical filters are used to select optical signals of different wavelengths to pass through.

[0170] For example, Figure 28 shows a schematic structural diagram of a sixth optical splitter device. As shown in Figure 28, the sixth optical splitter device may include a first-type second optical splitter, a second-type second optical splitter, a dual-core input port, a dual-core output port, multiple first single-core output ports, and a second single-core output port. The first-type second optical splitter includes a first optical output port and multiple second optical output ports, and the second-type second optical splitter includes a first optical output port and a second optical output port. The first core of the dual-core input port of the sixth optical splitter device is connected to the optical input port of the first-type second optical splitter, and the second core of the dual-core input port of the sixth optical splitter device is connected to the optical input port of the second-type second optical splitter. The first core of the dual-core output port of the sixth optical splitter device is connected to the first optical output port of the first-type second optical splitter, and the second core of the dual-core output port of the sixth optical splitter device is connected to the first optical output port of the second-type second optical splitter. The multiple second optical output ports of the first-type second optical splitter are connected one-to-one with the multiple first single-core output ports of the sixth optical splitter device, and the second optical output port of the first-type second optical splitter is connected to the second single-core output port of the sixth optical splitter device.

[0171] For example, Figure 29 shows a schematic structural diagram of a seventh optical splitter device. As shown in Figure 29, the seventh optical splitter device includes a third optical splitter, a dual-core input port, multiple first single-core output ports, and a second single-core output port. The first core of the dual-core input port of the seventh optical splitter device is connected to the optical input port of the third optical splitter, the second core of the dual-core input port of the seventh optical splitter device is connected to the second single-core output port, and the multiple optical output ports of the third optical splitter are connected one-to-one with the multiple first single-core output ports of the seventh optical splitter device.

[0172] Optionally, as shown in Figure 30, the dual-core output port of the fifth optical splitter shown in Figure 27 is connected to a plurality of cascaded sixth optical splitters shown in Figure 28, which are cascaded via dual-core input and output ports. Furthermore, the dual-core output port of the last sixth optical splitter in the cascaded plurality of sixth optical splitters shown in Figure 28 is connected to the dual-core input port of the seventh optical splitter shown in Figure 29. Furthermore, the second single-core output port of each sixth optical splitter shown in Figure 28 is connected to the fourth optical splitter shown in Figure 24. Furthermore, the second single-core output port of the seventh optical splitter shown in Figure 29 is connected to the fourth optical splitter shown in Figure 24. Thus, an optical network system including the first type of optical splitting link shown in Figure 14 and the second type of optical splitting link shown in Figure 15 can be deployed. The output port of the fourth optical splitter, the first single-core output port of the sixth optical splitter, and the first single-core output port of the seventh optical splitter are used to connect to an ONT.

[0173] Optionally, the optical splitter device in the embodiment of the present application (e.g., the first optical splitter device, the second optical splitter device, ..., the seventh optical splitter device) may include a pattern identifier, which is used to query the specification information of the optical splitter device. The specification information may include the internal structure of the optical splitter device, the rated parameters of the optical splitter device, etc. The internal structure of the optical splitter device may refer to the connection relationship between the optical splitter and its ports inside the optical splitter device, and the rated parameters of the optical splitter device may include the splitting ratio of the optical splitter device, the rated attenuation value of the optical splitter device, etc. In the case where the optical splitter device includes an optical reflector, the rated parameters may also include the optical reflectivity.

[0174] Optionally, the embodiments of the present application in which at least some components in the optical network system are integrated into optical network equipment are merely exemplary. In actual applications, at least some components in the optical network system may be integrated in other ways. It should be understood that any form of optical network equipment in which the components in the optical network system provided in this application are integrated shall be within the scope of protection of this application.

[0175] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0176] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0177] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0178] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0179] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0180] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0181] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented using a software program, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0182] As used in this application, the terms "component", "module", "system" and the like are intended to refer to a computer-related entity, which can be hardware, firmware, a combination of hardware and software, software, or software in operation. For example, a component can be, but is not limited to: a process running on a processor, a processor, an object, an executable file, a thread in execution, a program and / or a computer. As an example, both an application running on a computing device and the computing device can be a component. One or more components can exist in an executing process and / or thread, and a component can be located in a computer and / or distributed between two or more computers. In addition, these components can be executed from various computer-readable media having various data structures thereon. These components can communicate in the form of local and / or remote processes, such as based on signals having one or more data packets (e.g., data from a component that interacts with another component in a local system, a distributed system, and / or interacts with other systems in the form of signals over a network such as the Internet).

[0183] The present application presents various aspects, embodiments, or features in the context of systems that may include multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and / or may not include all of the devices, components, modules, etc. discussed in conjunction with the figures. Furthermore, combinations of these aspects may also be used.

[0184] Additionally, in the embodiments of this application, the word "exemplary" is used to indicate an example, illustration, or description. Any embodiment or design described in this application as "exemplary" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0185] In the embodiments of the present application, the terms "information," "signal," and "message" may sometimes be used interchangeably. It should be noted that, when the distinction between them is not emphasized, the meanings they intend to convey are the same. The terms "of," "corresponding," and "corresponding" may sometimes be used interchangeably. It should be noted that, when the distinction between them is not emphasized, the meanings they intend to convey are the same. The terms "system" and "network" may sometimes be used interchangeably. When the distinction between them is not emphasized, the meanings they intend to convey are the same. For example, "communication network" also refers to "communication system."

[0186] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field will know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0187] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An optical network system, characterized in that: The optical network system comprises a detection device, a first optical splitter and an optical filter; The first optical splitter includes a light input port and N light output ports, where N ≥ 2; The light input port of the first optical splitter is connected to the detection device, the N-1 light output ports of the first optical splitter are connected to the input ports of the N-1 optical filters in a one-to-one correspondence, the output ports of the N-1 optical filters are connected to the N-1 optical splitting links, and the optical splitting links are used to provide user access; The N-1 optical filters are respectively used to select optical signals of different wavelengths to pass through; The detection device is used to send detection optical signals of different wavelengths to the first optical splitter, and receive a detection optical signal returned by at least one of the optical splitting links.

2. The optical network system according to claim 1, characterized in that: The optical output ports other than the N-1 optical output ports of the first optical splitter are connected to a splitting link; Alternatively, the light outlets other than the N-1 light outlets among the N light outlets of the first optical splitter are connected to an inlet of the optical filter, and the outlet of the optical filter is connected to a splitting link.

3. The optical network system according to claim 1 or 2, characterized in that: Each of the optical splitting links comprises a plurality of cascaded second optical splitters and a third optical splitter; the first optical splitter is connected to a first-stage second optical splitter in the plurality of cascaded second optical splitters, and the third optical splitter is connected to a last-stage second optical splitter in the plurality of cascaded second optical splitters; The third optical splitter comprises a plurality of optical output ports, and the plurality of optical output ports of the third optical splitter are used to be connected to a plurality of optical network terminals ONTs.

4. The optical network system according to claim 3, characterized in that: At least one light outlet of the third optical splitter is connected to at least one optical reflector, the at least one optical reflector is used to be connected to at least one ONT, and the optical reflector is used to partially reflect the detection optical signal.

5. The optical network system according to claim 3 or 4, characterized in that: The N optical splitting links connected to the N optical output ports of the first optical splitter include first-type optical splitting links, and the plurality of second optical splitters in the first-type optical splitting links are second optical splitters of a first type. The first-type second optical splitter includes a first optical output port and a plurality of second optical output ports; The first optical output port is a cascade interface, and the plurality of second optical output ports are used to connect to a plurality of ONTs; At least one second light outlet of the plurality of second light outlets is connected to an inlet of at least one light reflector, an outlet of the at least one light reflector is used to be connected to at least one ONT, and the light reflector is used to partially reflect the detection optical signal.

6. The optical network system according to claim 3 or 4, characterized in that: The N optical splitting links connected to the N optical output ports of the first optical splitter include a second type of optical splitting link, the plurality of second optical splitters in the second type of optical splitting link are second type second optical splitters, and the second type second optical splitter includes a first optical output port and a second optical output port; The first light output port is a cascade interface, and the second light output port is connected to the light input port of the fourth optical splitter; The fourth optical splitter comprises a plurality of light outlets, at least one of which is connected to an inlet of at least one optical reflector, an outlet of the at least one optical reflector is used to be connected to at least one ONT, and the optical reflector is used to partially reflect the detection optical signal.

7. The optical network system according to claim 3 or 4, characterized in that: The N optical splitting links connected to the N optical output ports of the first optical splitter include a third type of optical splitting link, the multiple second optical splitters of the third type of optical splitting link include a first type of second optical splitter and a second type of second optical splitter, the first type of second optical splitter includes a first optical output port and a plurality of second optical output ports, and the second type of second optical splitter includes a first optical output port and a second optical output port; The first optical output port of the second optical splitter of the first type is a cascade interface, and the plurality of second optical output ports of the second optical splitter of the first type are used to connect to a plurality of ONTs; The first light output port of the second type of the second optical splitter is a cascade interface, and the second light output port of the second type of the second optical splitter is connected to the fourth optical splitter; the fourth optical splitter includes a plurality of light output ports, at least one light output port of the fourth optical splitter is connected to the inlet of at least one optical reflector, the outlet of the at least one optical reflector is used to be connected to at least one ONT, and the optical reflector is used to partially reflect the detection optical signal.

8. The optical network system according to any one of claims 3 to 7, characterized in that: The second optical splitter is an unequal-ratio optical splitter, and the optical power of the first light output port of the second optical splitter is greater than the optical power of the second light output port of the second optical splitter.

9. The optical network system according to any one of claims 3 to 8, characterized in that: The third beam splitter is an equal-splitting beam splitter.

10. The optical network system according to claim 6 or 7, characterized in that: The fourth beam splitter is an equal-splitting beam splitter.

11. The optical network system according to any one of claims 1 to 10, characterized in that: The first beam splitter is an equal-ratio beam splitter.

12. The optical network system according to any one of claims 1 to 11, characterized in that: The optical network system further comprises an optical line terminal OLT and a coupling device, wherein the detection device and the OLT are connected to the first optical splitter via the coupling device; and the optical filter allows the optical signal transmitted by the OLT to pass through.

13. A first optical splitting device, characterized in that: The first optical splitting device includes a first optical splitter, an input port, N output ports, and at least N-1 optical filters; The first optical splitter comprises a light input port and N light output ports, the light input port of the first optical splitter is connected to the input port, and the N light output ports of the first optical splitter are connected to the N output ports in a one-to-one correspondence; The optical filters are connected in series between the N-1 light outlets of the first optical splitter and the N-1 output ports, and different optical filters are used to select optical signals of different wavelengths to pass through.

14. A first optical splitting device, characterized in that: The first optical splitting device includes a first optical splitter, a single-core input port, a dual-core output port, and at least one optical filter; The first optical splitter includes a light input port and two light output ports, the light input port of the first optical splitter is connected to the single-core input port, and the two light output ports of the first optical splitter are connected to the dual-core output port; The optical filter is connected in series between at least one light outlet of the optical splitter and the dual-core output port, and different optical filters are used to select optical signals of different wavelengths to pass through.

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