Optical network system and optical splitting equipment

Abstract

The invention provides an optical network system and light splitting equipment, and relates to the technical field of optical communication. The optical network system comprises a detection device, a first optical splitter and an optical filter. The first optical splitter comprises a light inlet and N light outlets, wherein N is greater than or equal to 2. A light inlet of the first optical splitter is connected with detection equipment, N-1 light outlets of the first optical splitter are connected with inlets of N-1 optical filters in a one-to-one correspondence manner, outlets of the N-1 optical filters are connected with N-1 light splitting links, and different optical filters are used for selecting optical signals with different wavelengths to pass through. And the detection equipment is used for sending the detection light signals with different wavelengths to the first optical splitter and receiving the detection light signals returned by the at least one optical splitting link. Based on the optical network system, the detection optical signals emitted by the detection equipment can respectively enter different light splitting links, and the detection optical signals returned from the light splitting links and received by the detection equipment can reflect the state information of one light splitting link, so that the measurement and acceptance of the light splitting links can be realized at a local side.

Description

Technical Field

[0001] 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

[0002] Passive optical network (PON) is the main deployment form of optical access network. PON includes three parts: optical line terminal (OLT), optical distribution network (ODN) and optical network terminal (ONT). Among them, ODN includes multiple optical fiber links, which can be formed by one or more optical splitters connected by optical fibers. The optical splitter is an important passive component in ODN. It has the function of splitting and combining optical signals. It is often used for the distribution of optical signals, the connection of optical paths, the control of the transmission direction of optical signals, and the coupling control between various components.

[0003] Fiber splitter box is a device used in fiber optic communication network to distribute fiber optic signals to different terminal devices. The optical splitting function of fiber splitter box is realized through the optical splitter in it. The optical splitter in the fiber splitter box can be considered as the optical splitter in ODN that is close to the user side and connected to ONT.

[0004] After deploying the fiber distribution box, the construction personnel need to use an optical time-domain reflectometer (OTDR) to measure the link quality of the optical link between the fiber distribution box and the central office OLT. However, the use of OTDR requires high technical skills of the construction personnel, and the construction efficiency of the manual measurement method is also low. Summary of the invention

[0005] The present application provides an optical network system and a splitter device, which are used to solve the problem that the fiber splitter box in the optical network system needs to be inspected and accepted, which has high requirements for technicians and low construction efficiency.

[0006] 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, and 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.

[0007] It should be understood that, since different optical filters are used to select optical signals of different wavelengths to pass through, the detection optical signal sent by the detection device will only enter one of the N-1 optical splitting links at a time, and the detection optical 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 optical signal returned by the received optical splitting link. Based on this optical network system, the detection optical signal can be emitted at the local end to measure and inspect the quality of the optical splitting link, without the need for manual measurement during network deployment. This can reduce the technical requirements of construction personnel and improve the efficiency of network deployment.

[0008] In combination with the first aspect above, as a possible implementation manner, the detection device is further used to detect status information of the optical fiber link according to the returned detection optical signal, and the status information may include connectivity and link quality of the optical fiber link.

[0009] In combination with the first aspect, as a possible implementation, the light outlets other than the N-1 light outlets of the first optical splitter among the N light outlets are connected to a splitting link. Alternatively, the light outlets other than the N-1 light outlets of the first optical splitter among the N light outlets are connected to an inlet of an optical filter, and the outlet of the optical filter is connected to a splitting link.

[0010] In combination with the first aspect above, as a possible implementation, at least one light outlet 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, at least one light outlet of the third optical splitter is connected to the ONT through the optical reflector, and the optical reflector is used to partially reflect the detection optical signal. Based on this implementation, by adding an optical reflector, the detection device can more obviously measure the optical power change at the third optical splitter.

[0011] 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 first type of optical splitting link, and the multiple second optical splitters in the first type of optical splitting link are second optical splitters of the first type, and the second optical splitters of the first type include 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 ONTs. At least one second optical output port among the multiple second optical output ports 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, and the optical reflector is used to partially reflect the detection optical signal.

[0012] Based on this solution, the second optical output port of the second optical splitter can be used as a home access interface, so that users can access the optical network at any optical splitting level in the optical network system, providing a flexible optical access method. In addition, the optical reflector can enable the detection device to sense the change of the detection signal at the second optical output port, so as to detect the state of the second optical output port.

[0013] 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 second type of optical splitting link, and the multiple second optical splitters in the second type of optical splitting link are second type second optical splitters, 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 is a cascade interface, and the second optical output port is connected to the optical input port of the fourth optical splitter. The fourth optical splitter includes a plurality of 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 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 fourth optical splitter connected to the second optical outlet of the second optical splitter can be used to connect to the ONT, so that users can access the optical network at any optical splitting level in the optical network system, providing another flexible optical access method. Compared with the previous implementation method, this implementation method does not require each user to connect to the second optical splitter separately, which can save optical fiber. An optical reflector is set at the outlet of the fourth optical splitter, so that the detection equipment can sense the optical power change of the detection optical signal at the fourth optical splitter, so as to measure and accept the fourth optical splitter.

[0015] In combination with the above-mentioned first aspect, as a possible implementation method, 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 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 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.

[0016] Based on this solution, the second optical output port of the second optical splitter can be directly connected to the ONT or connected to the ONT 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.

[0017] In combination with the first aspect above, as a possible implementation manner, 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.

[0018] Based on this solution, the detection equipment can be connected to the OLT using a coupling device, so that it can be compatible with the existing PON network.

[0019] In combination with the first aspect, as a possible implementation manner, 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.

[0020] In combination with the above first aspect, as a possible implementation manner, the third beam splitter is an equal-splitting beam splitter.

[0021] In combination with the above first aspect, as a possible implementation manner, the fourth beam splitter is an equal-splitting beam splitter.

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

[0023] 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.

[0024] In combination with the second aspect, as a possible implementation, an optical filter may be connected in series between another optical outlet among the N optical outlets of the first optical splitter except the N-1 optical outlets and the corresponding output port, or may not be connected in series with the optical filter.

[0025] In a third aspect, the present application provides a second optical splitter device, which includes a second optical splitter of the first type, 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 second optical splitter of the first type. The second optical splitter of the first type includes a first light output port and multiple second light output ports, the first light output port of the second optical splitter of the first type is connected to the first output port of the second optical splitter device, and the multiple second light output ports of the second optical splitter of the first type 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 second optical splitter of the first type 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.

[0026] In a fourth aspect, the present application provides another second optical splitter device, the second optical splitter device comprising a second type of second optical splitter, an input port, a first output port, and a second output port. 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 comprises a first light output port and a second light output port. 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 a second light output port of the first type of second optical splitter is connected to a second output port of the second optical splitter device.

[0027] In a fifth aspect, the present application provides a third optical splitter device, the third optical splitter device comprising a third optical splitter, an input port, a plurality of 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 plurality of light output ports of the third optical splitter are connected one-to-one with the plurality of 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.

[0028] In a sixth aspect, the present application provides a fourth spectroscopic device, which 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, the multiple light output ports of the fourth spectrometer are connected one-to-one with the multiple output ports of the fourth spectrometer, and 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.

[0029] 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 light output ports. The single-core input port of the first optical splitter device is connected to the light input port of the first optical splitter, and the two light 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 light output ports of the first optical splitter. An optical filter is connected in series between at least one light 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.

[0030] In an eighth aspect, the present application provides a sixth optical splitter, which may include a second optical splitter of the first type, a second optical splitter of the second type, a dual-core input port, a dual-core output port, a plurality of first single-core output ports, and a second single-core output port. The second optical splitter of the first type includes a first light outlet and a plurality of second light outlets, and the second optical splitter of the second type includes a first light outlet and a second light outlet. The first core of the dual-core input port of the sixth optical splitter is connected to the light input port of the second optical splitter of the first type, and the second core of the dual-core input port of the sixth optical splitter is connected to the light input port of the second optical splitter of the second type. The first core of the dual-core output port of the sixth optical splitter is connected to the first light outlet of the second optical splitter of the first type, and the second core of the dual-core output port of the sixth optical splitter is connected to the first light outlet of the second optical splitter of the second type. The plurality of second light outlets of the first type of the second optical splitter are connected one-to-one with the plurality of first single-core output ports of the sixth optical splitter, and the second light outlet of the first type of the second optical splitter is connected to the second single-core output port of the sixth optical splitter.

[0031] In a ninth aspect, the present application provides a seventh optical splitter, the seventh optical splitter 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 is connected to the light input port of the third optical splitter, the second core of the dual-core input port of the seventh optical splitter is connected to the second single-core output port, and the plurality of light output ports of the third optical splitter are connected one-to-one with the plurality of first single-core output ports of the seventh optical splitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of using an optical power meter to detect an optical fiber splitter box provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of using an OTDR to detect an optical fiber splitter box provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the structure of an optical network system provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of an optical power variation curve of a detection optical signal provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the structure of an optical network system provided in an embodiment of the present application;

[0037] Figure 6 A schematic diagram of an optical power variation curve of a detection optical signal provided in an embodiment of the present application;

[0038] Figure 7 A schematic diagram of another optical power variation curve of a detection optical signal provided in an embodiment of the present application;

[0039] Figure 8 A schematic diagram of an optical power variation curve of another detection optical signal provided in an embodiment of the present application;

[0040] Fig. 9 A schematic diagram of comparison between an actual attenuation value and a rated attenuation value of optical power provided in an embodiment of the present application;

[0041] Fig.10 A schematic diagram for comparing an actual attenuation value of another optical power with a rated attenuation value provided in an embodiment of the present application;

[0042] Fig.11 A schematic diagram of another optical power variation curve of a detection optical signal provided in an embodiment of the present application;

[0043] Fig.12 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;

[0044] Fig.13 A schematic diagram showing a comparison between an actual value and a theoretical value of another reflection peak height provided in an embodiment of the present application;

[0045] Fig.14 A schematic diagram of the structure of another optical network system provided in an embodiment of the present application;

[0046] Fig.15 A schematic diagram of the structure of another optical network system provided in an embodiment of the present application;

[0047] Fig.16 A schematic diagram of the structure of another optical network system provided in an embodiment of the present application;

[0048] Fig.17 A schematic diagram of an optical power variation curve of another detection optical signal provided in an embodiment of the present application;

[0049] Fig.18 A schematic diagram of an optical power variation curve of another detection optical signal provided in an embodiment of the present application;

[0050] Fig.19 A schematic diagram of the structure of a first optical splitting device provided in an embodiment of the present application;

[0051] Fig. 20 A schematic diagram of the structure of a second light splitting device provided in an embodiment of the present application;

[0052] Fig.21A schematic diagram of the structure of a third optical splitting device provided in an embodiment of the present application;

[0053] Fig. 22 A schematic diagram of another optical network system provided in an embodiment of the present application;

[0054] Fig.23 A schematic diagram of the structure of another second light splitting device provided in an embodiment of the present application;

[0055] Fig.24 A schematic diagram of the structure of a fourth light splitting device provided in an embodiment of the present application;

[0056] Fig.25 A schematic diagram of another optical network system provided in an embodiment of the present application;

[0057] Fig.26 A schematic diagram of another optical network system provided in an embodiment of the present application;

[0058] Fig. 27 A schematic diagram of the structure of a fifth light splitting device provided in an embodiment of the present application;

[0059] Fig.28 A schematic diagram of the structure of a sixth light splitting device provided in an embodiment of the present application;

[0060] Fig.29 A schematic diagram of the structure of a seventh light splitting device provided in an embodiment of the present application;

[0061] Fig.30 A schematic diagram of another optical network system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0062] To facilitate understanding, first, a brief introduction is given to the technical terms and related technologies involved in this application.

[0063] In the prior art, the construction acceptance and fault diagnosis process of the optical fiber splitter box can be as follows:

[0064] 1. Test connectivity: You can connect the optical power meter to the end to be tested of the fiber optic splitter box (any end of the fiber optic splitter box) to detect whether there is light at the end to be tested. If the end to be tested detects an optical signal, it can be determined that the optical link from the OLT to the end to be tested is connected.

[0065] For example, Figure 1 The following is a schematic diagram of using an optical power meter to detect a fiber distribution box. Figure 1As shown, the optical fiber splitter box 101 can be connected to the OLT 102, and the optical power meter 103 can be connected to the port 1 of the optical fiber splitter box 101. When the OLT 102 is connected to the optical fiber splitter box 101, the port 1 of the optical fiber splitter box 101 can receive the optical signal from the OLT 102, and then the optical power meter 103 can detect the optical signal.

[0066] After confirming that the fiber distribution box is correctly connected to the OLT, the link quality can be further measured.

[0067] 2. Measure link quality: Connect the OTDR to the port of the fiber splitter box, turn on the OTDR for testing, and obtain the OTDR curve. The OTDR curve can reflect the signal strength changes during the transmission of the optical signal from the fiber splitter box to the OLT. According to the OTDR curve, the abnormality of the optical link can be determined. In addition, the optical power meter can be connected to each end of the fiber splitter box to measure the optical power of the optical signal received at each end. The optical power measured at the end can be used to calculate the loss of the optical signal from the OLT to the fiber splitter box end, and the quality of the optical link can be judged accordingly.

[0068] For example, Figure 2 The following is a schematic diagram of using OTDR to detect the optical fiber distribution box. Figure 2 As shown, the optical fiber splitter box 201 can be connected to the OLT 202, and the OTDR 203 can be connected to the port 1 of the optical fiber splitter box 201. The OTDR 203 can input the detection optical signal to the port 1 of the optical fiber splitter box 201, and when the OLT 202 is connected to the optical fiber splitter box 201, the signal sent by the OTDR 203 can be transmitted to the OLT 202. Thus, the OTDR 203 can obtain the OTDR curve of the transmission process of the detection optical signal from the port 1 of the optical fiber splitter box 201 to the OLT 202, and judge the state and quality of the optical link based on it.

[0069] However, there are the following problems when using optical power meters and OTDR to inspect and troubleshoot deployed fiber splitter boxes:

[0070] 1. There are many ends in the fiber optic splitter box, usually 8-32 ends. If the above method is used for acceptance and fault diagnosis for each end, the construction efficiency will be very low. In actual situations, in order to improve construction efficiency, usually only 1 to 2 ends in the fiber optic splitter box are sampled for acceptance and fault diagnosis using the above method, then the construction quality of the optical link corresponding to the remaining ends of the fiber optic splitter box cannot be guaranteed.

[0071] 2. When the fiber optic splitter box is inspected and fault-checked, it is necessary to operate relevant instruments on site, which not only increases the instrument configuration requirements for construction personnel, but also requires high skills of construction personnel. In general, it will increase the construction cost of the fiber optic splitter box.

[0072] The present application provides an optical network system and equipment, in which a detection device is provided on the OLT side of the optical network system, and optical filters that pass different wavelength test signals are provided at different ends of the primary optical splitter, so that the optical power variation curve of the optical signal in the transmission process of the branch link corresponding to each end of the primary optical splitter can be obtained through the detection device, and then the quality of the optical link can be determined according to the optical power variation curve. This solution does not require manual testing of the optical link quality, can effectively improve the deployment efficiency of the optical fiber network, and can also save construction costs.

[0073] 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, which 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. And, 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 items 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, the words "first", "second" and the like are used to distinguish the same items or similar items with substantially the same functions and effects. Those skilled in the art will understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit the differences. At the same time, in the embodiments of the present application, the words "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 solutions. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete manner for ease of understanding.

[0074] 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.

[0075] Figure 3 A schematic diagram of the structure of an optical network system provided in this application, such as Figure 3 As shown, the optical network system may include 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, 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.

[0076] Optionally, one optical output port among the N optical output ports of the first optical splitter except the N-1 optical output ports may be directly connected to a splitting link.

[0077] Optionally, one of the N optical output ports of the first optical splitter, except the N-1 optical output ports, can be connected to an inlet of an optical filter, and an outlet of the optical filter is 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.

[0078] Alternatively, if Figure 3 As shown, an optical splitting link may include a plurality of cascaded second optical splitters and a third optical splitter, the first optical splitter is connected to the first stage second optical splitter in the cascaded plurality of second optical splitters, and the third optical splitter is connected to the last stage second optical splitter in the cascaded plurality of second optical splitters.

[0079] Optionally, the third optical splitter may include a plurality of optical output ports, and the plurality of optical output ports of the third optical splitter are used to connect to the ONT.

[0080] Optionally, the second optical splitter may include multiple optical output ports, one of the multiple optical output ports is used as a cascade interface, and the other optical output ports are used as home interfaces for connecting to the ONT.

[0081] Alternatively, if Figure 3As shown, the optical network system may further include an OLT, and the OLT may be connected to the optical input port of the first optical splitter, so that the OLT may communicate with the ONT through the ODN composed of the first optical splitter, the second optical splitter, and the third optical splitter. It should be noted that all optical filters may pass the service optical signal transmitted by the OLT to ensure normal service transmission.

[0082] As a possible implementation, Figure 3 As shown, the detection device and OLT can be connected to the optical input port of the first optical splitter through a coupling unit. The optical signal sent by the detection device and OLT can be transmitted to the first optical splitter by the coupling unit, and the optical signal from the first optical splitter can also be transmitted to the detection device and OLT through the coupling unit.

[0083] Based on the above Figure 3 The optical network system shown in the present application proposes an optical link quality measurement method, which can measure and accept the optical network system at the central office. The method may include the following steps:

[0084] Step 1: The detection device emits a detection light signal.

[0085] When the N light output ports of the first optical splitter are connected to the N optical filters, the wavelength of the detection light signal emitted by the detection device can be a wavelength allowed to pass through one of the N optical filters. Thus, the detection light signal can pass through this optical filter and be blocked at other filters, and the detection light signal can enter the optical splitting link connected to this optical filter. Furthermore, the detection device can receive the detection light signal returned from the optical splitting link connected to this optical filter.

[0086] For example, it is assumed that the first optical splitter includes 4 optical outlets a1, a2, a3, and a4, and the optical outlet a1 is connected to the optical filter b1, the optical outlet a2 is connected to the optical filter b2, the optical outlet a3 is connected to the optical filter b3, and the optical outlet a4 is connected to the optical filter b4. The optical filters b1, b2, b3, and b4 are respectively connected to a splitting link. The wavelength of the optical signal allowed to pass by the optical filter b1 is λ1, the wavelength of the optical signal allowed to pass by the optical filter b2 is λ2, the wavelength of the optical signal allowed to pass by the optical filter b3 is λ3, and the wavelength of the optical signal allowed to pass by the optical filter b4 is λ4. If the wavelength of the detection optical signal emitted by the detection device is λ1, then the detection optical signal will be output from the optical outlet a1 of the first optical splitter, pass through the optical filter b1, and enter the splitting link connected to the optical filter b1. The detection optical signal will be blocked at the other three filters and cannot enter the splitting links connected to the other three filters.

[0087] In the case where N-1 optical output ports of the first optical splitter are connected to N-1 optical filters, and another optical output port is not connected to an optical filter, the wavelength of the detection optical signal emitted by the detection device may be a wavelength that one of the N-1 optical filters allows to pass, or may be a wavelength that none of the N-1 filters allow to pass. If the wavelength of the detection optical signal is a wavelength that one of the N-1 optical filters allows to pass, then the detection optical signal will enter the optical splitting link connected to this optical filter and the optical splitting link connected to the optical output port that is not connected to the optical filter. If the wavelength of the detection optical signal is a wavelength that none of the N-1 filters allow to pass, then the detection optical signal will only enter the optical splitting link connected to the optical output port that is not connected to the optical filter.

[0088] For example, it is assumed that the first optical splitter includes 4 optical outlets a1, a2, a3, and a4, and the optical outlet a1 is connected to the optical filter b1, the optical outlet a2 is connected to the optical filter b2, and the optical outlet a3 is connected to the optical filter b3. The wavelength of the optical signal allowed to pass by the optical filter b1 is λ1, the wavelength of the optical signal allowed to pass by the optical filter b2 is λ2, and the wavelength of the optical signal allowed to pass by the optical filter b3 is λ3. The optical filter b1, the optical filter b2, and the optical filter b3 are respectively connected to a splitting link, and the optical outlet a4 is directly connected to a splitting link. If the wavelength of the detection optical signal emitted by the detection device is λ1, then the detection optical signal will be output from the optical outlet a1 of the first optical splitter, pass through the optical filter b1, and enter the splitting link connected to the optical filter b1. In addition, since the optical outlet a4 is not connected to a filter, the detection optical signal will also be input from the optical outlet a4 and enter the splitting link connected to the optical outlet a4. If the wavelength of the detection light signal emitted by the detection device is λ4, the optical filter b1, the optical filter b2 and the optical filter 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.

[0089] For example, assume that the first optical splitter includes two optical output ports, a1 and a2, and the optical output port a1 is connected to the optical filter b1, the optical filter b1 is connected to a splitting link, and the optical output port a2 is directly connected to a splitting link. The wavelength of the optical signal allowed to pass by the optical filter b1 is λ1. If the wavelength of the detection optical signal emitted by the detection device is λ1, the detection optical signal will be output from the optical output port a1 of the first optical splitter, pass through the optical filter b1, and enter the splitting link connected to the optical filter b1. In addition, since the optical output port a2 is not connected to a filter, the detection optical signal will also be input from the optical output port a2 and enter the splitting link connected to the optical output port a2. If the wavelength of the detection optical signal emitted by the detection device is λ2, the optical filter b1 will block the detection optical signal, and the detection optical signal will only be output from the optical output port a2 and enter the splitting link connected to the optical output port a2.

[0090] It can be seen that if the N optical output ports of the first optical splitter are all connected to optical filters, then the detection light signal emitted by the detection device each time 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 each time can enter the optical splitting link connected to at most two optical output ports of the first optical splitter.

[0091] Step 2: The detection device receives the detection optical signal returned from the split optical link.

[0092] It should be understood that the detection light signal will be scattered in the optical fiber, and the backscattered light will be transmitted along the optical fiber back to the transmitting end (i.e., the detection device), 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 emitted detection light signal.

[0093] Optionally, if the detection light signal enters only the splitting link connected to one optical output port of the first optical splitter, then the detection device receives the detection light signal returned in the one splitting link. If the detection light signal enters two splitting links connected to two optical output ports of the first optical splitter, then the detection device receives the superposition of the detection light signals returned in the two splitting links.

[0094] Step 3: The detection device or controller generates an optical power variation curve according to the detection optical signal returned in the split optical link.

[0095] The detection device can record the signal strength and receiving time of the detection optical signal returned from the split optical link.

[0096] Optionally, the detection device may generate a curve showing how the signal strength of the detection light signal changes with the receiving time based on the information.

[0097] Optionally, the detection device may report information such as the signal strength and receiving time of the detection optical signal returned in the received split optical link to the controller, and the controller generates a curve showing the change of the signal strength of the detection optical signal with the receiving time.

[0098] 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.

[0099] 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 the controller is a curve of the optical power variation of the detection optical signal transmitted in the split optical link.

[0100] 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 the controller is a superimposed curve of the variation of the detection optical signal transmitted in the two split optical links.

[0101] It should be understood that since the reception time of the detection optical signal returned by the split optical link is positively correlated with the distance of the detection optical signal transmission, the transmission distance of the detection optical signal can be calculated based on the reception time. Thus, the curve of signal strength changing with reception time can be converted into a curve of signal strength changing with transmission distance. In the following embodiments of the present application, the optical power change curve of the detection optical signal is taken as an example of the curve of the signal strength of the detection optical signal changing with the transmission distance, and is uniformly explained here.

[0102] 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, there will be an attenuation event corresponding to the optical splitter in the optical power variation curve of the detection optical signal, and the attenuation event refers to the optical power drop step in the optical power variation curve.

[0103] For example, Figure 3 Taking the optical network system shown in FIG. 1 as an example, assuming that the detection optical signal enters only one optical splitting link from one optical output port of the first optical splitter, the schematic diagram of the optical power variation curve of the detection optical signal can be as follows: Figure 4 As shown, the optical power variation curve may include a first optical splitter, a plurality of second optical splitters ( Figure 4 The attenuation events corresponding to the second optical splitter_1 to the second optical splitter_N marked in the figure and a third optical splitter. The horizontal axis of the optical power variation curve is the transmission distance of the detection optical signal, and the vertical axis is the optical power of the detection optical signal. The optical power of the detection optical signal decays as the transmission distance increases.

[0104] It should be understood that the optical powers of the optical signals output from the multiple optical output ports of the optical splitter may be different, but the detection device senses the superposition of the optical signals output from each optical output port of the optical splitter, so the optical power value of the detection optical signal after passing through the optical splitter sensed by the detection device is the maximum optical power value among the optical powers of the optical signals output from each optical output port. Therefore, the attenuation value of the attenuation event corresponding to the optical splitter in the optical power variation curve is the minimum value among the attenuation values ​​generated by the detection optical signal passing through each optical output port.

[0105] 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 outlet, the other optical outlets are referred to as the second optical outlets, and the optical power of the first optical outlet is greater than the optical power of any second optical outlet. Thus, 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 (first optical outlet).

[0106] Step 4: The detection device or controller determines the status information of the optical splitting link according to the optical power variation curve.

[0107] Optionally, if the detection optical signal enters only the split optical link connected to one optical outlet of the first optical splitter, the acquired optical power variation curve can reflect the optical power variation of the detection 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.

[0108] Optionally, if the detection optical signal enters two split links connected to the two optical output ports of the first splitter, the optical power change curve obtained is a superposition curve of the change of the detection optical signal in the two split links. The optical power value of this optical power change curve is the superposition value of the power value of the detection optical signal in the two split links, so it 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 superposition curve of the change of the measurement signal in the two split links and the optical power change curve of the detection optical signal in one of the split links, the optical power change curve of the detection optical signal in the other split link is calculated.

[0109] For example, Figure 5 The present invention is a schematic diagram of an optical network system, in which a detection device is connected to the light input port of a first optical splitter, and the first optical splitter includes two light output ports, A and B. The light 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 light input port of a second optical splitter_1, one light output port of the second optical splitter_1 is connected to the light input port of a second optical splitter_2, one light output port of the second optical splitter_2 is connected to the light input port of a second optical splitter_3, and one light output port of the second optical splitter_3 is connected to the light input port of a third optical splitter_1. The light output port B of the first optical splitter is directly connected to the light input port of a second optical splitter_4, one light output port of the second optical splitter_4 is connected to the light input port of a second optical splitter_5, one light output port of the second optical splitter_5 is connected to the light input port of a second optical splitter_6, and one light output port of the second optical splitter_6 is connected to the light input port of a third optical splitter_2. Among them, the wavelength of the optical signal allowed to pass by the optical filter is λA, and the distances of the multiple second and third optical splitters from the first optical splitter from near to far are: 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.

[0110] by Figure 5For example, if the detection device sends a detection optical signal with a wavelength of λA, the detection optical signal will be output from the optical output port A of the first optical splitter and transmitted to the third optical splitter_1, and the detection 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 variation curve of the detection optical signal with a wavelength of λA obtained by the detection device can be shown as follows: Figure 6 As shown, the optical power variation curve includes multiple attenuation events, and the multiple attenuation events may 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 of the optical power variation curve is the superposition value of the detection optical signal in the branch links corresponding to the two optical outlets of the first optical splitter, and the optical power variation curve cannot be used to determine the status information of any branch link in the branch links corresponding to the two optical outlets.

[0111] by Figure 5 Taking the optical network system shown in FIG. 1 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 variation curve of the wavelength λB obtained by the detection device can be shown as Figure 7 As shown, the optical power variation curve includes a plurality of attenuation events, and the plurality of attenuation events may 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. Figure 7 and Figure 6 The optical power variation curve reflects the optical power variation of the detection optical signal output from the optical output port B of the first optical splitter and transmitted to the third optical splitter_2, so it can be used to determine the state information of the branch link corresponding to the optical output port B of the first optical splitter.

[0112] In the embodiment of the present application, it can be combined with Figure 6 The optical power variation curve of wavelength λA and Figure 7 The optical power variation curve of the wavelength λB shown in the figure is used to calculate the optical power variation curve corresponding to the detection light signal output from the light outlet A of the first optical splitter and transmitted to the third optical splitter_1. Among them, the optical power variation curve corresponding to the detection light signal output from the light outlet A of the first optical splitter and transmitted to the third optical splitter_1 = Figure 6 The optical power variation curve with wavelength λA is shown below: Figure 7 The optical power variation curve with wavelength λB is shown.

[0113] For example, the optical power variation curve corresponding to the detection optical signal being output from the optical output port A of the first optical splitter and transmitted to the third optical splitter_1 can be as follows: Figure 8 As shown, the optical power variation curve includes a plurality of attenuation events, and the plurality of attenuation events may correspond to the first optical splitter, the second optical splitter_1, the second optical splitter_2, the second optical splitter_3, and the third optical splitter_1 in sequence. Figure 8 and Figure 6 The positions of the same beam splitters are the same.

[0114] 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.

[0115] Optionally, the detection device or controller may learn the topology of the split optical link, based on which the detection device or controller may determine the connectivity of the link in the split optical link according to the correspondence between the position of the attenuation event in the optical power change curve and the position of the splitter in the split optical link. For example, if there is an optical link after the splitter corresponding to the last attenuation event in the optical power change curve, and the optical power change curve has been terminated, it means that the link of the split optical link is interrupted here.

[0116] Optionally, the attenuation of the optical signal passing through the spectrometer may have a rated value, and the rated value may be measured when the spectrometer leaves the factory. The present application may compare the attenuation value of the spectrometer measured by the detection device with the rated attenuation value of the spectrometer to determine the link quality. Among them, the attenuation value of the attenuation event corresponding to the spectrometer in the optical power change curve of the detected optical signal is the attenuation value of the spectrometer measured by the detection device. It should be understood that if the attenuation value of the spectrometer measured by the detection device is greater than the rated attenuation value of the spectrometer, it means that the link connection at the spectrometer is abnormal, resulting in a large loss of optical power. In the embodiment of the present application, the first spectrometer, the second spectrometer and the third spectrometer can all be judged in this way, which is uniformly described here.

[0117] As a possible implementation, when 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 the first threshold, it can be considered that there is a fault in the link at the first optical splitter. When 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 considered as a normal fluctuation of the network networking. The first threshold can be considered as a fluctuation range reserved for the first optical splitter networking.

[0118] As a possible implementation, when 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 the second threshold, it can be considered that there is a fault in the link at the second optical splitter. When 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 as a normal fluctuation of the network networking. The second threshold can be considered as a fluctuation range reserved for the second optical splitter networking.

[0119] As a possible implementation, when 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 the third threshold, it can be considered that there is a fault in the link at the third optical splitter. When 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 considered as a normal fluctuation of the network networking. The third threshold can be considered as a fluctuation range reserved for the third optical splitter networking.

[0120] For example, Fig. 9 It is a schematic diagram for comparing a measured attenuation value with a rated attenuation value, wherein the rated attenuation value of the optical splitter is x1, the measured attenuation value is x2, and W1 is the fluctuation range reserved for the optical splitter networking. Fig. 9 In the figure, x2 is greater than x1, but the value of x2 greater than x1 does not exceed W1. It can be considered that the attenuation value of the splitter belongs to normal networking fluctuation and the splitter status is normal.

[0121] As another example, Fig.10 This is another schematic diagram for comparing the measured attenuation value with the rated attenuation value, where the rated attenuation value of the splitter is x1, the measured attenuation value is x2, and W1 is the fluctuation range reserved for splitter networking. Fig.10 In the example, x2 is greater than x1, and the value of x2 being greater than x1 exceeds W1, which indicates that the optical splitter has an attenuation fault.

[0122] Optionally, Fig. 9 and Fig.10 The optical splitter corresponding to the attenuation value shown may be the first optical splitter, and W1 may be the first threshold. Or, Fig. 9 and Fig.10 The optical splitter corresponding to the attenuation value shown may be the second optical splitter, and W1 may be the second threshold. Or, Fig. 9 and Fig.10 The optical splitter corresponding to the attenuation value shown may be the third optical splitter, and W1 may be the third threshold.

[0123] 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.

[0124] Optionally, if in addition to the attenuation event corresponding to the optical splitter, an abnormal attenuation event also occurs at other locations in the optical power variation curve, it can be determined that a fault exists at the location where the abnormal attenuation event occurs. Figure 4 , assuming that there are other abnormal attenuation events before the attenuation event corresponding to the first optical splitter, it can be determined that there may be a fault at the position corresponding to the abnormal attenuation event before the first optical splitter in the optical link.

[0125] Based on the above method, firstly, whether the optical link at the optical splitter is faulty can be determined based on the attenuation event corresponding to the optical splitter in the optical power variation curve. Secondly, whether the position outside the optical splitter is faulty can be determined based on whether there is an abnormal attenuation event outside the optical splitter. Thus, the status information of the optical splitting link can be determined based on the optical power variation curve.

[0126] 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.

[0127] Optionally, at least one of the multiple light outlets 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, at least one light outlet of the third optical splitter can be connected to at least one ONT through the optical reflector. The optical reflector can partially reflect the detection optical signal. It should be understood that since the third optical splitter is located at the end of the optical link, the optical power of the detection optical signal reflected by the third optical splitter that can be detected by the detection device is relatively weak. The optical reflector is arranged at the light outlet of the third optical splitter, so that the optical power perceived by the detection device at the third optical splitter can be enhanced.

[0128] Optionally, when the light outlet of the third diffraction separator is connected to a light reflector, a reflection event corresponding to the light reflector will exist in the light power variation curve of the detection light signal obtained by the detection device. The reflection event is reflected as a reflection peak of the light power in the light power variation curve. In this application, the terms reflection event and reflection peak are interchangeable and are explained here uniformly.

[0129] For example, Fig.11 is a schematic diagram of another optical power variation curve of a detection optical signal. Figure 4 The optical power variation curves shown are similar, except that there are reflection events in addition to attenuation events at the location of the third optical splitter. Fig.11 As shown, the optical power change of the optical detection light 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 light signal, which increases the optical power perceived by the detection device at the third optical splitter, thereby forming a reflection peak. However, after the detection light signal passes through the third optical splitter and the optical reflector, there is no gain of 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. Fig.11 The decay events at other locations in Figure 4 The same is not repeated here.

[0130] 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 previous equipment (such as the first splitter, the second splitter and the third splitter). Therefore, the height of the reflection peak can be used as a criterion for the loss status of the optical fiber link and the equipment before the optical reflector.

[0131] Exemplarily, the total loss of the optical reflector when the detection light signal is transmitted to the third optical splitter can be calculated according to the height of the reflection peak, and then the loss of the detection light signal in the optical fiber and the loss of the detection light signal before passing through the optical splitter can be subtracted from the total loss, so as to obtain the loss at the third optical splitter. For example, the total loss of the optical reflector 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 transmitted to the third optical splitter - (optical fiber loss + loss of the first optical splitter + loss of the second optical splitter). Among them, optical fiber loss = optical fiber length * optical attenuation coefficient, and the loss of the first optical splitter and the loss of the second optical splitter can be measured before this.

[0132] The optical reflector has a rated reflectivity when it leaves the factory, so that 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 the 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. Among them, 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.

[0133] For example, Fig.12 This is a comparison diagram of the actual value and theoretical value of the reflection peak height, where the theoretical value of the reflection peak height is y1, the actual measured reflection peak height is y2, and R1 is the fluctuation range reserved for the optical reflector network. R1 takes into account the normal insertion loss of the device before the optical reflector. Fig.12 In the figure, y2 is smaller than y1, but the value of y2 being smaller than y1 does not exceed R1, and the optical link before the optical reflector is normal.

[0134] As another example, Fig.13 This is another comparison diagram of the actual value and theoretical value of the reflection peak height, where the theoretical value of the reflection peak height is y1, the measured reflection peak height is y2, and R1 is the fluctuation range reserved for the optical reflector network. R1 takes into account the normal insertion loss of the device before the optical reflector. Fig.13 In the example, y2 is smaller than y1, but the value of y2 being smaller than y1 exceeds R1, and there is a fault in the optical link before the optical reflector.

[0135] 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, A and B are positive numbers, A>B. As a possible implementation, the output optical powers of 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 light output ports. For a second optical splitter of the second type, the output optical power of a first optical output port accounts for A% of the input optical power of the optical splitter, and the output optical power of a 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.

[0136] As a possible implementation, 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. Fig.14 The structure diagram of another optical network system is shown, and the optical network system includes a first type of splitting link. The first optical output port of each second optical splitter is used 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 Fig.14 The connection relationship between the detection device, the optical filter, the first spectrometer, the second spectrometer and the third spectrometer can be referred to Figure 3 The relevant description will not be repeated here.

[0137] Optionally, Fig.14 At least one second light outlet of the first type of second 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 second light outlet of the first type of second optical splitter is connected to the ONT through the optical reflector.

[0138] 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. Fig.15 A structural schematic diagram of another optical network system is shown, which includes a second type of splitting link. The first optical outlet of each second optical splitter serves as a cascade interface, the second optical outlet of each second optical splitter is connected to the optical input port of the fourth optical splitter, and the multiple optical outlets of the fourth optical splitter are used to connect to multiple ONTs. At least one optical outlet 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 outlet of the multiple optical outlets of the fourth optical splitter is connected to at least one ONT through the optical reflector. Fig.15 The connection relationship between the detection device, the optical filter, the first spectrometer, the second spectrometer and the third spectrometer can be referred to Figure 3 The relevant description will not be repeated here.

[0139] 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 of second optical splitter and a second type of second optical splitter. Fig.16 A structural schematic diagram of another optical network system is shown, which includes a third type of splitting link. Among them, the first optical outlet of the second optical splitter of the first type serves as a cascade interface, and the multiple second optical outlets of the second optical splitter of the first type are used to connect to multiple ONTs. In addition, the first optical outlet of the second optical splitter of the second type serves as a cascade interface, the second optical outlet of the second optical splitter of the second type is connected to the optical input port of a fourth optical splitter, and the multiple optical outlets of the fourth optical splitter are used to connect to multiple ONTs. At least one optical outlet 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 outlet of the multiple optical outlets of the fourth optical splitter is connected to at least one ONT through an optical reflector.

[0140] Optionally, Fig.16 At least one second light outlet of the first type of second 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 second light outlet of the first type of second optical splitter is connected to the ONT through the optical reflector.

[0141] In the embodiment of the present application, the multiple optical splitting links corresponding to the multiple light 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 described here.

[0142] Optionally, if the detection optical signal enters the first type of splitting link from the optical outlet of the first optical splitter, and the second optical 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 variation curve of the detection optical signal can be as follows: Figure 4 As shown, the attenuation value of the attenuation event corresponding to the second optical splitter in the optical power variation curve is the attenuation value generated when the detection optical signal is output from the first optical output port of the second optical splitter, and the optical power variation curve does not reflect the attenuation of the detection optical signal output from the second optical output port. However, the output optical power of the first optical output port and the second optical output port of the second optical splitter are proportional. The present application can estimate the attenuation generated from the optical input port to the second optical output port based on the attenuation generated from the optical input port to the first optical output port. Furthermore, the link quality from the optical input port to the second optical output port can be determined by comparing the actual attenuation value of the second optical output port with the rated attenuation value.

[0143] Optionally, if the detection optical signal enters the first type of splitting link from the optical output port of the first optical splitter, and at least one second optical output port 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 variation curve of the detection optical signal can be as follows: Fig.17 As shown. Figure 4 Compared with the optical power variation curve shown in FIG. 1 , the position where the second optical splitter is located includes reflection events in addition to attenuation events. Fig.17 As shown in the figure, the optical power change of the detection light signal at the second optical splitter first increases to form a reflection peak, and then decreases, and 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 is attenuated after passing through the second optical splitter. Fig.17 The attenuation events corresponding to the first and third beam splitters can be found in Figure 4 The relevant description in will not be repeated here.

[0144] According to the introduction of the reflection peak in the previous text, the height of the reflection peak corresponding to the optical reflector set at the second light outlet of the second optical splitter is related to the loss of the optical link before the reflector. The height of the reflection peak can be used as a criterion for the loss state of the optical fiber link and equipment before the optical reflector.

[0145] Optionally, the total loss of the optical reflector transmitted to the second optical splitter_x by the detection light signal can be calculated according to the height of the reflection peak, and then the loss of the detection light signal in the optical fiber and the loss of the detection light signal before passing through the optical splitter can be subtracted from the total loss, so as to obtain the loss of the detection 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 = light loss + loss of the first optical splitter + loss of the second optical splitter_1 + ... + loss of the second optical splitter_x, then, the loss of the second optical splitter_x = 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-1). Among them, the optical fiber loss = optical fiber length * optical attenuation coefficient, the loss of the first optical splitter, and the loss from the loss of the second optical splitter_1 to the second optical splitter_x-1 can be measured before this.

[0146] Optionally, Fig.14 The light outlet of the third optical splitter connected to the first type of optical splitting link may also be provided with a light reflector. In this case, Fig.17 There can also be a reflection event before the attenuation event corresponding to the third optical splitter. In this case, the change of the optical power change curve at the third optical splitter can be referred to Fig.11 As shown, no further description is given here.

[0147] Optionally, if the detection optical signal enters the second type of splitting link from the optical output port of the first optical splitter, the optical power variation curve of the detection optical signal can be as follows: Fig.18 As shown. Among them, there will be a reflection event at a certain distance after the second beam splitter, and the reflection event is generated by the optical reflector set at the light outlet of the fourth beam splitter connected to the second beam splitter. The distance between the reflection event generated by the optical reflector set at the light outlet of the fourth beam splitter in the optical power variation curve and the attenuation event corresponding to the second beam splitter is related to the distance between the fourth beam splitter and the second beam splitter. Normally, the distance between the second beam splitter and the fourth beam splitter connected to it is closer than the distance between the second beam splitter and the second beam splitter or the third beam splitter of the next level. Therefore, the position of the reflection event generated by the optical reflector connected to the fourth beam splitter is between the attenuation event of the second beam splitter and the attenuation event of the second beam splitter of the next level, or between the attenuation event of the second beam splitter and the attenuation event of the third beam splitter. For example, as Fig.18 As shown, there is a reflection event at a position 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, and the reflection event is generated by the optical reflector set at the light outlet of the fourth optical splitter_1 connected to the second optical splitter_1. There is a reflection event at a position 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, and the reflection event is generated by the optical reflector set at the light outlet of the fourth optical splitter_N connected to the second optical splitter_N.

[0148] It should be understood that the optical power variation curve cannot reflect the attenuation of the detection optical signal output from the second light outlet of the second optical splitter, so 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 light outlet of the fourth optical splitter so that the detection device can detect the gain of optical power brought by the reflector. Furthermore, the quality of the optical link before the fourth optical splitter can be determined according to the height of the reflection peak corresponding to the optical reflector set at the light outlet of the fourth optical splitter.

[0149] Optionally, the total loss of the optical reflector transmitted to the fourth optical splitter_x by the detection light signal can be calculated according to the height of the reflection peak, and then the loss of the detection light signal in the optical fiber and the loss of the detection light signal before passing through the optical splitter are subtracted from the total loss, so as to obtain the loss of the detection light signal passing through the fourth optical splitter_x. The fourth optical splitter_x is the fourth optical splitter connected to the second optical outlet of the second optical splitter_x. For example, the total loss of the optical reflector transmitted to the fourth optical splitter_x = light loss + loss of the first optical splitter + loss of the second optical splitter_1 + ... + loss of the second optical splitter_x + loss of the fourth optical splitter_x, then, the loss of the fourth optical splitter_x = total loss of the optical reflector input to the fourth 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). Among them, optical fiber loss=optical 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 before this.

[0150] Optionally, Fig.15 The light outlet of the third optical splitter connected to the second type of optical splitting link may also be provided with a light reflector. In this case, Fig.18 There can also be a reflection event before the attenuation event corresponding to the third optical splitter. In this case, the change of the optical power change curve at the third optical splitter can be referred to Fig.11 As shown, no further description is given here.

[0151] Optionally, if the detection optical signal passes through the branch link where the third type of split optical link is located, then the first type of second optical splitter corresponds to an attenuation event in the optical power variation curve. For details, please refer to Fig.17 The attenuation event corresponding to the second optical splitter in the second type and the fourth optical splitter connected thereto correspond to the attenuation event and the reflection event in the optical power variation curve. For details, please refer to Fig.18 The attenuation event corresponding to the second optical splitter and the reflection event corresponding to the fourth optical splitter in the embodiment of the present invention will not be described in detail in this application.

[0152] Optionally, Fig.16 The light outlet of the third optical splitter connected to the third type of optical splitting link may also be provided with a light reflector.

[0153] 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, and the output optical power of each optical output port accounts for 1 / 100 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, and 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, and 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.

[0154] 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, thereby achieving the same effect as a transmissive optical filter.

[0155] The above embodiments introduce the optical network system and optical link quality detection method provided by the present application. Next, the specific implementation form of the equipment in the optical network system and the optical network system based on the deployment of specific optical network equipment will be introduced.

[0156] Optionally, the optical splitter in the optical network system of the present application and the filter or reflector connected to its optical outlet can be integrated in a splitting device, so that the deployment of the optical network system can be achieved by connecting different splitting devices.

[0157] For example, Fig.19 A schematic diagram of the structure of a first optical splitting device provided in this application, such as Fig.19 As shown, 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.

[0158] Optionally, in Fig.19In the first optical splitter device shown, an optical filter may be connected in series between another optical outlet other than the N-1 optical outlets of the first optical splitter and the corresponding output port, or may not be connected in series with the optical filter. Both implementation structures are protected by this application and are described here.

[0159] For example, Fig. 20 A schematic diagram of the structure of a second optical splitting device provided in this application, such as Fig. 20 As shown, the second optical splitter device includes a second optical splitter of the first type, an input port, a first output port, a plurality of 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 second optical splitter of the first type. The second optical splitter of the first type includes a first light output port and a plurality of second light output ports, the first light output port of the second optical splitter of the first type is connected to the first output port of the second optical splitter device, and the plurality of second light output ports of the second optical splitter of the first type are connected one-to-one with the plurality of 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 second optical splitter of the first type 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.

[0160] For example, Fig.21 A schematic diagram of the structure of a third optical splitting device provided in this application, such as Fig.21 As shown, 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.

[0161] Alternatively, if Fig. 22 As shown, Fig.19 One output port of the first optical splitter device is connected to a plurality of cascaded Fig. 20 The second optical splitting device shown in FIG. Fig. 20 The second optical splitter device shown is cascaded through the first output port. And, the last stage Fig. 20 The first output port of the second optical splitter is Fig.21 The third optical splitter device shown is connected. Thus, it can be deployed to achieve Fig.14 The first type of split optical link in the optical network system shown. Fig. 20 The second output port of the second optical splitter device is shown Fig.21 The output port of the third optical splitting device shown can be used to connect to an ONT.

[0162] For example, Fig.23 A schematic diagram of the structure of another second light splitting device provided in this application, such as Fig.23 As shown, the second optical splitter 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 device is connected to the light input port of the second optical splitter of the first type. The second optical splitter of the first type includes a first light output port and a second light output port. The first light output port of the second optical splitter of the first type is connected to the first output port of the second optical splitter device, and a second light output port of the second optical splitter of the first type is connected to a second output port of the second optical splitter device.

[0163] For example, Fig.24 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, the multiple light output ports of the fourth spectrometer are connected one-to-one with the multiple output ports of the fourth spectrometer device, and 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.

[0164] Alternatively, if Fig.25 As shown, Fig.19 One output port of the first optical splitter device is connected to a plurality of cascaded Fig.23 The second optical splitting device shown in FIG. Fig.23 The second optical splitter device shown is cascaded through the first output port. And, the last stage Fig.23 The first output port of the second optical splitter is Fig.21 The third optical splitter device shown is connected. And, each Fig.23 The second output port of the second optical splitter is Fig.24 The fourth optical splitter device shown is connected. Thus, it can be deployed to achieve Fig.15 The second type of split optical link in the optical network system shown. Fig.24 The output port of the fourth optical splitter device is shown Fig.21 The output port of the third optical splitting device shown can be used to connect to an ONT.

[0165] Alternatively, if Fig.26 As shown, Fig.19 One output port of the first optical splitter device is connected to a plurality of cascaded second optical splitters, and the plurality of cascaded second optical splitters may include Fig. 20 The second optical splitter device shown and Fig.23 The second optical splitter device shown in the figure, multiple second optical splitters are cascaded through the first output port. Fig.23The second output port of the second optical splitter is Fig.24 In addition, the first output port of the last second optical splitter in the cascaded second optical splitter is connected to Fig.21 The third optical splitter device shown is connected. Thus, it can be deployed to achieve Fig.16 The third type of split optical link in the optical network system shown. Fig. 20 The second output port of the second optical splitter device shown, Fig.21 The output port of the third optical splitter device shown, and Fig.24 The output port of the fourth optical splitting device shown can be used to connect to an ONT.

[0166] Above Fig.19 , Fig. 20 , Fig.21 , Fig.23 and Fig.24 This example takes the case where each optical splitter is independently used as an optical splitting device. In some possible situations, multiple optical splitters can be networked in the same device and can still form an optical network system.

[0167] For example, Fig. 27 A schematic diagram of the structure of a fifth optical splitting device is shown, such as Fig. 27 As shown, 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 light output ports. The single-core input port of the first optical splitter device is connected to the light input port of the first optical splitter, and the two light 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 light output ports of the first optical splitter. An optical filter is connected in series between at least one light 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.

[0168] For example, Fig.28 A schematic diagram of the structure of a sixth optical splitting device is shown, such as Fig.28As shown, the sixth optical splitter device may include a second optical splitter of the first type, a second optical splitter of the second type, a dual-core input port, a dual-core output port, a plurality of first single-core output ports, and a second single-core output port. The second optical splitter of the first type includes a first light outlet and a plurality of second light outlets, and the second optical splitter of the second type includes a first light outlet and a second light outlet. The first core of the dual-core input port of the sixth optical splitter device is connected to the light input port of the second optical splitter of the first type, and the second core of the dual-core input port of the sixth optical splitter device is connected to the light input port of the second optical splitter of the second type. The first core of the dual-core output port of the sixth optical splitter device is connected to the first light outlet of the second optical splitter of the first type, and the second core of the dual-core output port of the sixth optical splitter device is connected to the first light outlet of the second optical splitter of the second type. The plurality of second light outlets of the first type of the second optical splitter are connected one-to-one with the plurality of first single-core output ports of the sixth optical splitter device, and the second light outlet of the first type of the second optical splitter is connected to the second single-core output port of the sixth optical splitter device.

[0169] For example, Fig.29 A schematic diagram of the structure of a seventh optical splitting device is shown, such as Fig.29 As shown, the seventh optical splitter device includes 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 light 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 light output ports of the third optical splitter are connected one-to-one with the plurality of first single-core output ports of the seventh optical splitter device.

[0170] Alternatively, if Fig.30 As shown, Fig. 27 The dual-core output port of the fifth optical splitter device is connected to multiple cascaded Fig.28 The sixth optical splitting device shown in FIG. 1 is a cascade of multiple Fig.28 The sixth optical splitter device is cascaded through a dual-core input port and an output port. Fig.28 The dual-core output port of the last sixth optical splitter in the sixth optical splitter is connected to Fig.29 The seventh optical splitter device shown in FIG. Fig.28 The second single-core output port of the sixth optical splitter is connected to Fig.24 The fourth optical splitter is connected as shown. Fig.29 The second single-core output port of the seventh optical splitter device is Fig.24 The fourth optical splitter device shown is connected. Thus, the deployment can include Fig.14 The first type of splitter link and Fig.15The optical network system of the second type of splitting link shown in the figure, wherein the output port of the fourth splitting device, the first single-core output port of the sixth splitting device, and the first single-core output port of the seventh device are used to connect to the ONT.

[0171] 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, and the pattern identifier is used to query the specification information of the optical splitter device. Among them, 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 inside the optical splitter device and its ports, 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.

[0172] Optionally, the embodiments of the present application integrate at least some of the devices in the optical network system into optical network equipment for exemplary purposes only. In practical applications, at least some of the devices in the optical network system may also be integrated in other ways. It should be understood that any form of optical network equipment integrated with the devices in the optical network system provided by the present application should be within the scope of protection of the present application.

[0173] 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.

[0174] Those of ordinary skill 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 to be beyond the scope of this application.

[0175] Those skilled in the art can 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.

[0176] In the several embodiments provided in the present 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. There may be other division methods in actual implementation, 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.

[0177] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0178] 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.

[0179] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part 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, the process or function described in the embodiment of the present application is generated in whole or in part. 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 a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or may contain one or more servers, data centers and other data storage devices that can be integrated with the medium. 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)).

[0180] As used in this application, the terms "component", "module", "system", etc. 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, an application running on a computing device and the computing device can both be components. One or more components can exist in a process and / or thread in execution, 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 with various data structures thereon. These components can communicate in a local and / or remote process manner, such as according to a signal with one or more data packets (for example, data from a component that interacts with another component in a local system, a distributed system, and / or interacts with other systems in a signal manner through a network such as the Internet).

[0181] The present application presents various aspects, embodiments, or features around a system 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. In addition, combinations of these schemes may also be used.

[0182] In addition, in the embodiments of the present application, the word "exemplary" is used to indicate an example, illustration or description. Any embodiment or design described as "exemplary" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0183] In the embodiments of the present application, information, signal, and message can sometimes be used interchangeably. It should be noted that when the distinction between them is not emphasized, the meanings they intend to express are consistent. "Of," "corresponding," and "corresponding" can sometimes be used interchangeably. It should be noted that when the distinction between them is not emphasized, the meanings they intend to express are consistent. "System" and "network" can sometimes be used interchangeably. When the distinction between them is not emphasized, the meanings they intend to express are consistent. For example, "communication network" also refers to "communication system."

[0184] 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. A person of ordinary skill in the art can appreciate that with the evolution of the 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.

[0185] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope 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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