Method, apparatus, device, chip and system for identifying downlink ports of an optical distribution network

Abstract

Provided are a method, apparatus, device, chip, and system for identifying downlink ports of an optical distribution network, belonging to the field of communications technology. The method comprises: a second optical communication device receives an optical signal transmitted by a first optical communication device via an optical distribution network (ODN), the ODN comprising at least one stage of delay-interference-based optical splitter; obtaining a hard decision result based on the optical signal, the hard decision result comprising multiple first decision values ​​of the optical signal at multiple edge sampling points; performing a correlation operation based on the hard decision result to obtain an operation result, the operation result being used to indicate the delay of a target port, the target port being the downlink port in the ODN through which the optical signal passes. This method can identify downlink ports of ODNs in FTTR optical access and optical transport networks.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a method, apparatus, device, chip, and system for identifying a downlink port of an optical distribution network (ODN). Background Art

[0002] Point-to-multipoint (P2MP) optical communication systems, such as passive optical networks (PONs), typically consist of a central node, an optical distribution network (ODN), and multiple leaf nodes. The central node connects to multiple leaf nodes through the ODN. Each leaf node is connected to a downlink port of the ODN. During system operation and maintenance, it is necessary to identify the downlink port of the ODN to which each leaf node is connected.

[0003] In related technologies, ODN can be implemented using a delay-interference-based optical splitter. For such an ODN, methods for identifying the downstream port of the ODN include:

[0004] First, the second optical communication device receives the optical signal sent by the first optical communication device. It then performs optoelectronic conversion on the received optical signal to obtain an electrical signal. It then performs high-speed analog-to-digital conversion on the electrical signal to obtain a soft decision result. An autocorrelation operation is performed on the soft decision result to obtain a calculation result indicating the delay of the target downlink port. This calculation result indicates the downlink port to which the leaf node is connected. Alternatively, the first optical communication device is a central node and the second optical communication device is a leaf node.

[0005] However, this method for identifying the downstream port relies on high-speed analog-to-digital conversion and is not suitable for identifying the downstream port of the ODN when the second optical communication device is in an analog receiving architecture. Summary of the Invention

[0006] This application provides a method, apparatus, device, chip, and system for identifying downlink ports of an ODN, which can identify downlink ports of an ODN in an analog receiving architecture. The technical solution adopted is as follows:

[0007] In a first aspect, a method for identifying a downlink port of an optical network (ODN) is provided. The ODN includes at least one stage of delay-interference-based optical splitters. The method can be performed by a second optical communication device. The method comprises: the second optical communication device receives an optical signal transmitted by a first optical communication device through the ODN; based on the optical signal, obtaining a hard decision result, the hard decision result comprising multiple first decision values ​​of the optical signal at multiple edge sampling points; and performing a correlation operation based on the hard decision result to obtain an operation result, the operation result being used to indicate the delay of a target port, where the target port is the downlink port in the ODN through which the optical signal passes.

[0008] In the present application, the ODN includes at least one level of delay-interference-based optical splitter, and the optical signal passing through the downstream port of the ODN will carry different delay characteristics. The hard decision result obtained based on the optical signal includes multiple first decision values ​​of the optical signal at multiple edge sampling points. The first decision value at the edge sampling point can reflect the waveform change of the optical signal caused by the delay. Therefore, by performing a correlation operation on the hard decision result, an operation result indicating the delay of the target port can be obtained, that is, an operation result indicating the target port is obtained. This hard decision result can be obtained through an analog receiving architecture without the need for sampling using a high-speed analog-to-digital converter.

[0009] In a first possible implementation manner, the hard decision result is a binary sequence composed of the multiple first decision values.

[0010] In this embodiment, performing a correlation operation based on the hard decision result to obtain an operation result includes: performing an autocorrelation operation on the binary sequence to obtain the operation result, the operation result including N correlation peaks, wherein N is equal to the sum of the order of the delay interference-based spectrometer in the ODN and 1, the N correlation peaks include a main peak and N-1 non-main peaks, and the distance between the N-1 non-main peaks and the main peak is used to indicate the delay amount of the target port.

[0011] In a second possible implementation, the hard decision result is a binary sequence consisting of the multiple first decision values ​​and multiple second decision values, where the multiple second decision values ​​are decision values ​​of the optical signal at multiple intermediate sampling points. In this binary sequence, the multiple first decision values ​​and the multiple second decision values ​​are alternately arranged.

[0012] In this embodiment, performing a correlation operation based on the hard decision result to obtain an operation result includes: performing a cross-correlation operation on the binary sequence to obtain the operation result, the operation result including N correlation peaks, wherein N is equal to the sum of the order of the delay interference-based spectrometer in the ODN and 1, the N correlation peaks include a main peak and N-1 non-main peaks, and the distance between the N-1 non-main peaks and the main peak is used to indicate the delay amount of the target port.

[0013] Through the above two implementations, the delay of the target port can be accurately determined.

[0014] Optionally, the method further includes: determining the port identifier of the target port according to the correspondence between the delay amount and the port identifier and the calculation result.

[0015] During implementation, for ease of management, each downstream port of the ODN is typically assigned a different port identifier. This calculation result needs to be converted into the identifier of the target port. If different downstream ports correspond to different delays, there is a one-to-one correspondence between delays and port identifiers. Therefore, the port identifier of the target port can be determined based on the calculation result and the correspondence between delays and port identifiers.

[0016] Optionally, determining the port identifier of the target port based on the correspondence between the delay amount and the port identifier and the calculation result includes: determining the delay amount of the target port based on the calculation result; and determining the port identifier corresponding to the delay amount of the target port in the correspondence as the port identifier of the target port. The port identifier of the target port can be determined by searching the delay amount of the target port in the correspondence, which simplifies implementation.

[0017] In some scenarios, the first optical communication device needs to know the port identifier of the target port between the first optical communication device and the second optical communication device. Therefore, after determining the port identifier of the target port, the second optical communication device can send port indication information to the first optical communication device, and the port indication information is used to indicate the port identifier of the target port.

[0018] Optionally, the first optical communication device is an optical line terminal (OLT), and the second optical communication device is an optical network unit (ONU); or, the first optical communication device is an ONU, and the second optical communication device is an OLT; or, the first optical communication device is a fiber to the room (FTTR) device, and the second optical communication device is a slave FTTR device; or, the first optical communication device is a slave FTTR device, and the second optical communication device is a master FTTR device. That is, the ODN can be an ODN in a PON system or an ODN in an FTTR system.

[0019] In a second aspect, a device for identifying a downstream port of an ODN is provided. The device has the functionality to implement the method described in the first aspect. The functionality can be implemented in hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functionality.

[0020] In a third aspect, a communication device is provided, comprising a processor and a communication interface, wherein the communication interface is connected to the processor, wherein the processor is used to implement any one of the methods provided in the first aspect.

[0021] Optionally, there are one or more processors, and the processor is a multi-core processor, and there are one or more memories.

[0022] Optionally, the communication interface comprises a transceiver.

[0023] Optionally, the communication device further includes a memory storing program code; the processor is configured to read and execute the program code stored in the memory to implement any one of the methods provided in the first aspect.

[0024] Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0025] In the specific implementation process, the memory can be a non-transitory memory, such as a read-only memory (ROM), which can be integrated on the same chip as the processor or be set on different chips. This application does not limit the type of memory and the setting method of the memory and the processor.

[0026] In a fourth aspect, an optical communication system is provided, comprising a first optical communication device, an ODN, and a second optical communication device, wherein the first optical communication device is connected to the second optical communication device via the ODN. The second optical communication device is configured to implement any one of the methods provided in the first aspect.

[0027] Optionally, the optical communication system is a PON system or a FTTR system.

[0028] In a fifth aspect, a computer-readable storage medium is provided, in which a software program is stored. When the software program is read and executed by one or more processors, it can implement any one of the methods provided in the first aspect.

[0029] In a sixth aspect, a computer program (product) is provided, wherein the computer program (product) comprises: a computer program code, and when the computer program code is executed by a computer device, the computer device executes any one of the methods provided in the first aspect.

[0030] In a seventh aspect, a chip is provided, comprising a processor and a communication interface connected to the processor, wherein the processor is configured to execute instructions so that the chip performs any one of the methods provided in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of a P2MP optical communication system provided in an embodiment of the present application;

[0032] Figure 2 This is a schematic diagram of the structure of another P2MP optical communication system provided in an embodiment of the present application;

[0033] Figure 3 This is a flow chart of a method for identifying a downlink port of an ODN provided in an embodiment of the present application;

[0034] Figure 4 is a waveform diagram of an optical signal received by the second optical communication device after being converted into an electrical signal;

[0035] Figure 5 This is a waveform diagram after a correlation operation is performed on a hard decision result provided by an embodiment of the present application;

[0036] Figure 6 This is another waveform diagram after correlation operation is performed on the hard decision result provided by an embodiment of the present application;

[0037] Figure 7 This is a structural diagram of a device for identifying a downlink port of an ODN provided in an embodiment of the present application;

[0038] Figure 8 It is a structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0040] Figure 1 This is a schematic diagram of the structure of a P2MP optical communication system provided in an embodiment of the present application. Figure 1 As shown, the P2MP optical communication system includes a central node 1, an ODN 2, and multiple leaf nodes 3. The ODN 2 includes an optical splitter 21 for optical power distribution, a trunk optical fiber connected between the optical splitter 21 and the central node 1, and branch optical fibers connected between the optical splitter 21 and the leaf nodes 3.

[0041] exist Figure 1 In the figure, the optical splitter 21 is a delayed interferometer optical splitter and is a passive device. The optical splitter 21 includes a wavelength division multiplexing device 211 and multiple delay units 212. The wavelength division multiplexing device 211 includes a common port and multiple branch ports, and each branch port of the wavelength division multiplexing device 211 is connected to a delay unit 212. It should be noted that for the sake of illustration, Figure 1 Only one delay unit 212 is marked.

[0042] The delay unit 212 includes an optical splitter 2121 , an optical combiner 2122 , a first optical fiber 2123 , and a second optical fiber 2124 .

[0043] Optical splitter 2121 and optical combiner 2122 each include a first port and two second ports. The first port of optical splitter 2121 is connected to a branch port of wavelength division multiplexing device 211. A second port of optical splitter 2121 is connected to a second port of the optical combiner via a first optical fiber 2123. The other second port of optical splitter 2121 is connected to the other second port of optical combiner 2122 via a second optical fiber 2124. The first port of optical combiner 2122 is a branch port of optical splitter 21, or the first port of optical combiner 2122 is connected to a branch port of optical splitter 21. The length of first optical fiber 2123 is greater than or equal to the length of second optical fiber 2124.

[0044] The optical splitter 2121 divides the optical signal output from the branch port of the wavelength division multiplexing device 211 into two sub-signals. One sub-signal is transmitted to the optical combiner 2122 through the first optical fiber 2123, and the other sub-signal is transmitted to the optical combiner 2122 through the second optical fiber 2124. The optical combiner 2122 combines the two received sub-signals and sends the combined optical signal to the corresponding leaf node 3.

[0045] When the length of the first optical fiber 2123 is greater than the length of the second optical fiber 2124, the optical path of the sub-signal transmitted in the first optical fiber 2123 is longer, while the optical path of the sub-signal transmitted in the second optical fiber 2124 is shorter. When the two sub-signals are transmitted to the optical combiner 2122, there is a certain transmission delay between the sub-signal transmitted in the first optical fiber 2123 and the sub-signal transmitted in the second optical fiber 2124. The magnitude of this transmission delay is related to the length difference between the first optical fiber 2123 and the second optical fiber 2124. Due to this transmission delay, the two sub-optical signals may interfere when transmitted to the optical combiner 2122, affecting the waveform of the optical signal output by the delay unit 212.

[0046] In the optical splitter 21, the length difference between the first optical fiber 2123 and the second optical fiber 2124 in different delay units 212 varies. The optical signals output by different delay units 212 are formed by the interference of two sub-signals with different transmission delays. Therefore, the waveforms of the optical signals passing through different delay units 212 are different. Based on these waveforms, the transmission delays of the two corresponding sub-signals can be determined, thereby determining the delay unit 212 that each optical signal passed through. Since delay units 212 correspond one-to-one to the downstream ports of the ODN, determining the delay unit 212 that an optical signal passed through can also determine the downstream port of the ODN that the optical signal passed through.

[0047] In some examples, the length difference between the first optical fiber 2123 and the second optical fiber 2124 in each delay unit 212 may be an arithmetic progression. Figure 1 , according to the arrangement order of the delay units from top to bottom, the length difference corresponding to the first delay unit 212 is 0, the length difference corresponding to the second delay unit 212 is 2 cm, the length difference corresponding to the third delay unit 212 is 4 cm, the length difference corresponding to the fourth delay unit 212 is 6 cm, the length difference corresponding to the fifth delay unit 212 is 8 cm, the length difference corresponding to the sixth delay unit 212 is 10 cm, the length difference corresponding to the seventh delay unit 212 is 12 cm, and the length difference corresponding to the eighth delay unit 212 is 14 cm. The tolerance of the arithmetic progression can be set as needed, and the embodiment of the present application does not limit this. For example, it can be 1 cm or 3 cm.

[0048] In other examples, the length difference between the first optical fiber 2123 and the second optical fiber 2124 in each delay unit 212 may not be an arithmetic progression, as long as it is different.

[0049] Figure 1The example uses eight leaf nodes 3 and a 1:8 optical splitter 21 (i.e., one common port and eight branch ports) as an example. During implementation, the number of branch ports on optical splitter 21 and the number of connected leaf nodes 3 can be adjusted based on actual needs, and this embodiment of the present application does not impose any restrictions on this.

[0050] Exemplarily, the splitting ratio of the optical splitter 2121 can be 1:99, 3:97 or 5:95, etc., which can be set according to actual needs, and the embodiment of the present application does not limit this.

[0051] Figure 2 This is a schematic diagram of the structure of another P2MP optical communication system provided in an embodiment of the present application. Figure 2 As shown, the P2MP optical communication system includes a central node 1, an ODN 2, and multiple leaf nodes 3. The ODN 2 includes a first-level optical splitter 23 and two second-level optical splitters 22. The structures of the first-level optical splitter 23 and the two second-level optical splitters 22 are similar to those of the Figure 1 The structure of the optical splitter 21 is the same as that of the optical splitter 21 in FIG.

[0052] Central node 1 is connected to the common port of first-stage optical splitter 23 via optical fiber. One branch port of first-stage optical splitter 23 is connected to the common port of a second-stage optical splitter 22 via optical fiber. Another branch port of first-stage optical splitter 23 is connected to the common port of another second-stage optical splitter 22 via optical fiber. Each of the eight branch ports of second-stage optical splitter 22 is connected to a leaf node 3 via optical fiber.

[0053] The length difference corresponding to any delay unit in the first-stage optical splitter 23 is different from the length difference corresponding to each delay unit in the second-stage optical splitter 22 , while the length differences corresponding to the delay units in each second-stage optical splitter 22 are the same.

[0054] Figure 2 In the figure, the length differences of the delay units in the first-stage optical splitter 23 are 0 cm, 2 cm, 4 cm, 6 cm, 8 cm, 10 cm, 12 cm, and 14 cm, respectively, arranged in descending order from top to bottom. The length differences of the delay units in each second-stage optical splitter 22 are 16 cm, 18 cm, 20 cm, 22 cm, 24 cm, 26 cm, 28 cm, and 30 cm, respectively, arranged in descending order from top to bottom.

[0055] Figure 2 A two-stage optical splitter is used as an example. In practical applications, a larger number of optical splitters can be cascaded. In addition, the optical splitter can also be a 1:X optical splitter, where X is an integer other than 8, such as 2, 3, or 4.

[0056] also, Figure 2 In the embodiment, a part of the branch ports of the first-level splitter 23 are connected to the second-level splitter 22, and the other part of the branch ports are vacant. In other embodiments, all the branch ports of the first-level splitter 23 are connected to the second-level splitter 22; or, a part of the branch ports of the first-level splitter 23 are connected to the second-level splitter 22, and the other part of the branch ports are connected to the leaf node 3.

[0057] When realized, Figure 1 and Figure 2 The P2MP optical communication system described in this paper can be applied to FTTR optical access and optical transport networks. In some examples, the P2MP optical communication system is a PON system, with central node 1 being the OLT. Typically, the OLT connects to upstream network-side equipment (such as switches and routers). Leaf nodes 3 are ONUs or optical network terminals (ONTs). In other examples, the P2MP optical communication system is an FTTR system, with central node 1 being the master FTTR device (also known as a master gateway or master optical modem) and leaf nodes 3 being slave FTTR devices (also known as slave gateways or slave optical modems).

[0058] exist Figure 1 and Figure 2 In the P2MP optical communication system shown, in the downlink direction, the downlink signal sent by the central node 1 is transmitted through the ODN 2 to each leaf node 3. The leaf node 3 selectively receives the downlink data belonging to itself in the downlink signal. In the uplink direction, the uplink signals sent by multiple leaf nodes 3 are combined by the ODN 2 into a single optical signal and transmitted to the central node 1. In the uplink direction, the central node 1 receives the burst optical signals from all leaf nodes 3.

[0059] In the embodiment of the present application, the port of the ODN connected to the leaf node 3 is called a downlink port. Each downlink port corresponds to a different combination of delay units. For any leaf node 3, whether it is a downlink signal sent from the central node 1 to the leaf node 3, or an uplink signal sent from the leaf node 3 to the central node 1, it passes through a different downlink port (i.e., a combination of delay units). Therefore, both the downlink signal and the uplink signal carry the characteristics of the delay amount corresponding to the downlink port they pass through (such as waveform, etc.), and this delay amount can be used to identify the corresponding downlink port.

[0060] Figure 3 This is a flow chart illustrating a method for identifying downlink ports of an optical network (ODN) provided in an embodiment of the present application. The ODN includes at least one level of optical splitter based on interference delay and can be any of the aforementioned ODNs. The method can be performed by a second optical communication device, which can be the aforementioned central node 1 or leaf node 3.

[0061] like Figure 3 As shown, the method includes the following steps 301 to 303.

[0062] 301: Receive an optical signal sent by a first optical communication device.

[0063] The optical signal is sent by the first optical communication device to the second optical communication device via the aforementioned ODN.

[0064] When the second optical communication device is a central node, the first optical communication device is a leaf node; or when the second optical communication device is a leaf node, the first optical communication device is a central node.

[0065] 302: Obtain a hard decision result based on the optical signal.

[0066] The hard decision result includes multiple first decision values ​​of the optical signal at multiple edge sampling points.

[0067] The hard decision result is a binary sequence. Exemplarily, the hard decision result is a binary sequence consisting of 1 and 0, or a binary sequence consisting of 1 and -1.

[0068] The second optical communication device first converts the optical signal into an analog electrical signal through a receiver, and then processes the analog electrical signal through an analog decision device (such as a serializer / deserializer (SERDES) receiver) to obtain a hard decision result.

[0069] 303: Perform a correlation operation based on the hard decision result to obtain an operation result.

[0070] The calculation result is used to indicate the delay of the target port, which is the downlink port through which the optical signal passes in the ODN.

[0071] In this embodiment of the present application, the hard decision result obtained based on the optical signal includes multiple first decision values ​​of the optical signal at multiple edge sampling points. The first decision values ​​at the edge sampling points can reflect the waveform change of the optical signal after passing through the ODN, and this waveform change is related to the delay corresponding to the downstream port of the ODN through which the optical signal passes. Therefore, a correlation operation can be performed on the hard decision result to obtain an operation result indicating the delay of the target port, that is, an operation result indicating the target port. This hard decision result can be obtained using an analog receiving architecture, without the need for sampling using a high-speed analog-to-digital converter.

[0072] In a first possible implementation manner, the hard decision result is a binary sequence composed of multiple first decision values.

[0073] In the first possible implementation, step 303 includes:

[0074] An autocorrelation operation is performed on the binary sequence to obtain an operation result, which includes N correlation peaks, where N is equal to the sum of the order of the delayed interferometer-based optical splitter in the ODN and 1. For example, Figure 1 In the example, the order of the optical splitter is 1, then N is equal to 2. For another example, Figure 2 In the example, the number of the optical splitter is 2, then N is equal to 3.

[0075] The N correlation peaks include a main peak and N-1 non-main peaks. The distance between the N-1 non-main peaks and the main peak is used to indicate the delay of the target port.

[0076] In a second possible implementation, the hard decision result includes multiple first decision values ​​of the optical signal at multiple edge sampling points and multiple second decision values ​​of the optical signal at multiple intermediate sampling points (also known as optimal sampling points). In other words, the hard decision result is a binary sequence consisting of multiple first decision values ​​and multiple second decision values. In this binary sequence, the multiple first decision values ​​and the multiple second decision values ​​are alternately arranged.

[0077] In the second possible implementation, 303 includes:

[0078] A cross-correlation operation is performed on the binary sequence to obtain a result comprising N correlation peaks, where N is equal to the sum of the number of delay interferometer-based optical splitters in the ODN and 1. The N correlation peaks include a main peak and N-1 non-main peaks. The distance between the N-1 non-main peaks and the main peak indicates the delay of the target port.

[0079] The following combination Figure 4 The edge sampling points and the middle sampling points are described. Figure 4 It is a waveform diagram of the optical signal received by the second optical communication device after being converted into an electrical signal, also known as the eye diagram. Figure 4 As shown, the middle sampling point P1 is the sampling point where the eye is most open in the eye diagram, and the edge sampling point P2 is the sampling point on the left or right side of the eye in the eye diagram.

[0080] During implementation, the second optical communication device may utilize a clock data recovery (CDR) circuit based on a binary (i.e., bang-bang or bang-bang) phase detector and an analog decider to obtain the hard decision result. The analog decider is configured to determine the sampled output of the CDR circuit to convert the analog electrical signal into a logic level, thereby obtaining the hard decision result.

[0081] Exemplarily, the CDR circuit includes a Bang-Bang phase detector, a digital integrator, a numerically controlled oscillator, and a sampler. The Bang-Bang phase detector generates a phase indication signal, which indicates whether the clock phase is ahead or behind relative to the center of the eye diagram. The digital integrator receives the phase indication signal and, based on the received phase indication signal, drives the numerically controlled oscillator to change the phase and / or frequency of its output clock, ultimately locking to the average frequency of the input data. The sampler samples the input data at the optimal sampling point based on the clock output by the numerically controlled oscillator to obtain a sampling result.

[0082] The analog decision maker is used to compare each sampling value in the sampling result with the threshold. When the sampling value is greater than the threshold, the corresponding decision value is determined to be 1; when the sampling value is less than the threshold, the corresponding decision value is determined to be 0 or -1.

[0083] During implementation, different port identifiers are usually configured for each downstream port of the ODN for ease of management. In this case, the method may further include:

[0084] Step 304: Determine the port identifier of the target port according to the correspondence between the delay amount and the port identifier and the calculation result.

[0085] The embodiment of the present application does not limit the arrangement of port identifiers, which can be selected as needed.

[0086] In some examples, a combination of the number of optical splitters and the branch port number of each optical splitter level can be used as a port identifier. Exemplarily, the port identifier can be {1-1, 2-1, ...Nn}, where N represents the number of optical splitters and n represents the nth branch port of the Nth optical splitter level. Alternatively, a combination of the port numbers of each optical splitter level can be used as a port identifier. Exemplarily, the port identifier can be {1, 1, ...n}, where there are N numbers in the combination, the number represents the number of the optical splitter, and n represents the nth branch port of the corresponding optical splitter. The branch ports of each optical splitter are numbered starting from 1 in ascending or descending order according to the length difference corresponding to the branch ports.

[0087] In other examples, a combination of the number of optical splitter levels and the length difference corresponding to the branch ports of each optical splitter level can be used as the port identifier. For example, {1-0, 2-2, ...Nx}, where N represents the number of optical splitter levels and x represents the branch port of the Nth optical splitter with a length difference of x. Alternatively, the length difference corresponding to the branch ports of each optical splitter level can be used as the port identifier.

[0088] Optionally, 304 includes the following two steps:

[0089] The first step is to determine the delay of the target port based on the calculation result;

[0090] In the second step, the port identifier corresponding to the delay amount of the target port in the corresponding relationship is determined as the port identifier of the target port.

[0091] The corresponding relationship may be pre-stored in the second optical communication device before executing the method.

[0092] For example, the second optical communication device is pre-set in the second optical communication device when it leaves the factory, or is configured and saved in the second optical communication device after the ODN network is established. By searching the delay amount of the target port in the corresponding relationship, the port identifier of the target port can be determined, which is simple to implement.

[0093] Exemplarily, in this first step, the delay of the target port is determined based on the distance between each non-primary peak and the primary peak. The distance between a non-primary peak and the primary peak can be used to determine a delay value. That is, the calculation result corresponds to at least one distance value, and the delay of the target port includes at least one delay value, each delay value corresponding to a delay unit in a splitter. Furthermore, the number of delay values ​​included in the delay of the target port is equal to the number of distance values ​​corresponding to the calculation result.

[0094] During implementation, the distance between the non-main peak and the main peak can be expressed in time, with a unit such as picoseconds (ps); or, it can be represented as a multiple of a unit time, with the unit time being UI or the duration of one bit.

[0095] For example, for a 50G signal, the duration of each UI is 20 ps. Multiplying this distance by the propagation speed of the optical signal in the optical fiber (approximately 2e8 m / s) yields the length difference corresponding to the target port.

[0096] In some examples, in the corresponding relationship, each delay value corresponds to a port identifier, and different delay values ​​correspond to different port identifiers. As mentioned above, the port identifier may include at least one number or at least one length difference.

[0097] for Figure 1 The ODN shown in Table 1 can be used to represent the corresponding relationship. Figure 1 The ODN in the embodiment only has one level of optical splitter, so the delay value corresponding to the optical splitter of this level is the delay amount, and the number of the branch port of the optical splitter of this level or the corresponding length difference is the port identifier.

[0098] It should be noted that the values ​​in Table 1 are only examples, and the delay values ​​in Table 1 will vary with the length differences corresponding to the branch ports of the optical splitter.

[0099] Table 1 Correspondence between delay amount and port identification

[0100]

[0101] for Figure 2 The ODN shown in FIG. 2 can be represented by a combination of Table 2 and Table 3. The delay value corresponding to the first-level optical splitter and the delay value corresponding to the second-level optical splitter are the delay of the target port, and the combination of the branch port number of the first-level optical splitter and the branch port number of the second-level optical splitter is the port identifier of the target port.

[0102] It should be noted that the values ​​in Tables 2 and 3 are examples. The delay values ​​in Tables 2 and 3 will vary with the length difference between the first-stage optical splitter and the second-stage branch port.

[0103] Table 2 Correspondence between the delay value and branch port number corresponding to the first-level optical splitter

[0104]

[0105] Table 3. Correspondence between the delay value and branch port number corresponding to the second-level optical splitter

[0106]

[0107] Figure 5 This is a waveform diagram of a hard decision result after correlation operation provided by an embodiment of the present application, showing Figure 1 The result of the cross-correlation operation performed by the ODN shown in FIG. Figure 5 As shown, there are two correlation peaks, of which the correlation peak with a larger amplitude is the main peak and the correlation peak with a smaller amplitude is the non-main peak. The distance S0 between the two correlation peaks is 10 UI. The target port is identified as 3 or 4 cm by looking up the table 1.

[0108] Figure 6 This is another waveform diagram after performing correlation operation on the hard decision result provided by the embodiment of the present application, showing Figure 2 The ODN shown in FIG. 1 is a result of performing a cross-correlation operation when the hard decision result includes a first decision value and a second decision value.

[0109] like Figure 6As shown in Figure 2, there are three correlation peaks, of which the one with the largest amplitude is the main peak, and the two correlation peaks with smaller amplitudes are non-main peaks. The distance S1 between one non-main peak and the main peak is 70 UI, and the distance S2 between the other non-main peak and the main peak is 80 UI. By looking up Table 2 and Table 3, we can get two branch port numbers (8 and 1 respectively) or two length differences (14 cm and 16 cm respectively), and the corresponding port identifiers are {8, 1} or {14, 16}. That is, the optical signal passes through Figure 2 The eighth branch port of the first-stage optical splitter 23 and the first branch port of the second-stage optical splitter 22 are connected.

[0110] Figure 5 and Figure 6 In the example, the horizontal axis represents time, and the vertical axis represents amplitude, both dimensionless. Both the horizontal and vertical axes need to be multiplied by 10 to the fifth power.

[0111] It should be noted that the above step 304 may be an optional step. Since different downstream ports of the ODN correspond to different delay amounts, the delay amount may be directly used to distinguish each downstream port.

[0112] When the second optical communication device is a leaf node and the first optical communication device is a central node, the method further includes: sending port indication information to the first optical communication device, where the port indication information is used to indicate a target port. In this way, the first optical communication device receives the port indication information sent by each first optical communication device and can obtain the connection relationship between each second optical communication device and the downlink port of the ODN in the P2MP system, facilitating subsequent system maintenance and other operations.

[0113] When the second optical communication device is the central node and the first optical communication device is the leaf node, since the leaf node sends optical signals to the central node within the time period allocated by the central node, the second optical communication device can determine the identity of the first optical communication device that sent the optical signal based on the time it received the optical signal. In this way, after identifying the target port, the second optical communication device can directly establish a connection relationship between each second optical communication device and the downlink port of the ODN based on the transmission time of the optical signal, facilitating subsequent system maintenance and other operations.

[0114] In some scenarios, after the central node determines the port identifier of the target port, it may also send port indication information to the leaf node so that the leaf node knows the downstream port to which it is connected.

[0115] Optionally, the port indication information may be a port identifier, or an index value of the port identifier, etc.

[0116] Figure 7This is a schematic diagram of the structure of a device for identifying a downlink port of an ODN provided by an embodiment of the present application. The device can be formed as part or all of the second optical communication device in the form of software, hardware, or a combination of software and hardware. Figure 7 As shown, the apparatus 700 includes: a receiving module 701, a decision module 702, and a correlation module 703. The receiving module 701 is configured to receive an optical signal sent by a first optical communication device via an optical network (ODN), wherein the ODN includes at least one stage of delay interferometry-based optical splitter. The decision module 702 is configured to obtain a hard decision result based on the optical signal, wherein the hard decision result includes multiple first decision values ​​of the optical signal at multiple edge sampling points. The correlation module 703 is configured to perform a correlation operation based on the hard decision result to obtain an operation result, which is used to indicate the delay of a target port, which is a downlink port in the ODN through which the optical signal passes.

[0117] In one possible implementation, the hard decision result is a binary sequence consisting of multiple first decision values; the correlation module 703 is used to perform an autocorrelation operation on the binary sequence to obtain an operation result, where the operation result includes N correlation peaks, where N is equal to the sum of the order of the delay interference-based spectrometer in the ODN and 1, and the N correlation peaks include a main peak and N-1 non-main peaks, and the distance between the N-1 non-main peaks and the main peak is used to indicate the delay amount of the target port.

[0118] In another possible implementation, the hard decision result is a binary sequence consisting of multiple first decision values ​​and multiple second decision values, where the multiple second decision values ​​are decision values ​​of the optical signal at multiple intermediate sampling points. The correlation module 703 is used to perform a cross-correlation operation on the binary sequence to obtain an operation result, which includes N correlation peaks, where N is equal to the sum of the order of the delay interference-based optical splitter in the ODN and 1. The N correlation peaks include a main peak and N-1 non-main peaks, and the distance between the N-1 non-main peaks and the main peak is used to indicate the delay amount of the target port.

[0119] Optionally, the apparatus 700 further includes a determining module 704 configured to determine the port identifier of the target port according to the correspondence between the delay amount and the port identifier and the calculation result.

[0120] Optionally, the determination module 704 is configured to determine the delay of the target port based on the calculation result; and determine the port identifier corresponding to the delay of the target port in the corresponding relationship as the port identifier of the target port.

[0121] Optionally, the apparatus 700 further includes: a sending module, configured to send port indication information to the first optical communication device, where the port indication information is used to indicate a port identifier of the target port.

[0122] It should be noted that the apparatus for identifying a downstream port of an ODN provided in the above embodiment is only illustrated by the division of the above functional modules when identifying the downstream port of the ODN. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus for identifying a downstream port of an ODN provided in the above embodiment and the method embodiment for identifying a downstream port of an ODN are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0123] The descriptions of the processes corresponding to the above figures have different focuses. For parts that are not described in detail in a certain process, please refer to the relevant descriptions of other processes.

[0124] The present application also provides a communication device. Figure 8 This is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. Figure 8 As shown, the communication device 800 includes a processor 804 and a communication interface 808. The processor 804 and the communication interface 808 are connected, for example, via a bus 802. It should be understood that the present application does not limit the number of processors in the communication device 800.

[0125] The bus 802 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 The bus 802 may include a path for transmitting information between various components of the communication device 800 (eg, the processor 804 and the communication interface 808).

[0126] The processor 804 may include any one or more processors such as a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor (MP), or a digital signal processor (DSP).

[0127] The communication interface 808 uses a transceiver module (eg, an optical module), such as, but not limited to, a transceiver, to implement communication between the communication device 800 and other devices or a communication network.

[0128] Optionally, the communication device further includes a memory 806, and the processor 804, the memory 806, and the communication interface 808 communicate with each other via a bus 802. It should be understood that the present application does not limit the number of memories in the communication device 800.

[0129] The memory 806 may include volatile memory, such as random access memory (RAM). The processor 804 may also include non-volatile memory, such as read-only memory (ROM), flash memory, a hard disk drive (HDD), or a solid state drive (SSD).

[0130] The memory 806 stores executable program codes, and the processor 804 executes the executable program codes to implement the functions of the aforementioned modules, thereby implementing the aforementioned control method for the access point device. That is, the memory 806 stores instructions for executing the control method for the access point device.

[0131] Embodiments of the present application also provide a computer program product including instructions. The computer program product may be software or a program product including instructions that can be executed on a computer device or stored on any available medium. When executed on at least one computer device, the computer program product causes the at least one computer device to execute the aforementioned method for controlling an access point device.

[0132] Embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium can be any available medium capable of storing data on a computer device, or a data storage device such as a data center that contains one or more available media. The available medium can be a magnetic medium (e.g., a floppy disk, hard disk, or magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive). The computer-readable storage medium includes instructions that instruct the computer device to execute the aforementioned access point device control method.

[0133] The present application also provides a communication system including a master device and at least one slave device, wherein the master device and the at least one slave device are connected via an optical fiber. The master device and the at least one slave device are used to implement the control method of the access point device.

[0134] The embodiment of the present application further provides a chip, which includes a processor and a communication interface connected to the processor; the processor is configured to execute instructions so that the chip executes the aforementioned control method for an access point device.

[0135] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meaning understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the patent application specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" cover the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. The multiple involved in the embodiments of this application refers to two or more. A and / or B means that there are three situations: A; B; and A and B.

[0136] The above description is merely an exemplary embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for identifying a downlink port of an optical distribution network, characterized in that: The optical distribution network includes at least one stage of delayed interferometry-based optical splitters, and the method includes: The second optical communication device receives the optical signal sent by the first optical communication device through the optical distribution network; Obtaining a hard decision result based on the optical signal, the hard decision result including a plurality of first decision values ​​of the optical signal at a plurality of edge sampling points; A correlation operation is performed based on the hard decision result to obtain an operation result, wherein the operation result is used to indicate the delay amount of the target port, where the target port is a downlink port in the optical distribution network through which the optical signal passes.

2. The method according to claim 1, characterized in that The hard decision result is a binary sequence composed of the multiple first decision values; The performing of a correlation operation based on the hard decision result to obtain an operation result includes: An autocorrelation operation is performed on the binary sequence to obtain the operation result, where the operation result includes N correlation peaks, where N is equal to the sum of the order of the delay interference-based optical splitter in the optical distribution network and 1, and the N correlation peaks include a main peak and N-1 non-main peaks, and the distance between the N-1 non-main peaks and the main peak is used to indicate the delay amount of the target port.

3. The method according to claim 1, characterized in that The hard decision result is a binary sequence consisting of the multiple first decision values ​​and the multiple second decision values, where the multiple second decision values ​​are decision values ​​of the optical signal at multiple intermediate sampling points; The performing of a correlation operation based on the hard decision result to obtain an operation result includes: Performing a cross-correlation operation on the binary sequence to obtain the operation result, the operation result including N correlation peaks, where N is equal to the sum of the number of orders of the delay interference-based optical splitter in the optical distribution network and 1, the N correlation peaks including a main peak and N-1 non-main peaks, and the distance between the N-1 non-main peaks and the main peak is used to indicate the delay amount of the target port.

4. The method according to any one of claims 1 to 3, characterized in that The method further comprises: The port identifier of the target port is determined according to the corresponding relationship between the delay amount and the port identifier and the calculation result.

5. The method according to claim 4, characterized in that The determining the port identifier of the target port according to the correspondence between the delay amount and the port identifier and the calculation result includes: Determining a delay of the target port based on the calculation result; The port identifier corresponding to the delay amount of the target port in the corresponding relationship is determined as the port identifier of the target port.

6. The method according to claim 4, characterized in that The method further comprises: Sending port indication information to the first optical communication device, where the port indication information is used to indicate a port identifier of the target port.

7. The method according to any one of claims 1 to 3, characterized in that The first optical communication device is an optical line terminal OLT, and the second optical communication device is an optical network unit ONU; or The first optical communication device is an ONU, and the second optical communication device is an OLT; or, The first optical communication device is a main fiber-to-the-room FTTR device, and the second optical communication device is a slave FTTR device; or The first optical communication device is a slave FTTR device, and the second optical communication device is a master FTTR device.

8. A device for identifying a downlink port of an optical distribution network, characterized in that: The optical distribution network includes at least one stage of delayed interferometry-based optical splitter, and the device includes: a receiving module, configured to receive an optical signal sent by a first optical communication device through the optical distribution network; A decision module, configured to obtain a hard decision result based on the optical signal, wherein the hard decision result includes a plurality of first decision values ​​of the optical signal at a plurality of edge sampling points; The correlation module is used to perform a correlation operation based on the hard decision result to obtain an operation result, wherein the operation result is used to indicate the delay amount of the target port, and the target port is a downlink port through which the optical signal passes in the optical distribution network.

9. A communication device, characterized in that: The communication device includes a processor and a communication interface, and the processor is connected to the communication interface; The processor is configured to execute the method for identifying a downstream port of an optical distribution network according to any one of claims 1 to 7.

10. A chip, characterized in that: The chip includes a processor and a communication interface, wherein the communication interface is connected to the processor, and the processor is configured to execute instructions so that the chip executes the method for identifying a downstream port of an optical distribution network according to any one of claims 1 to 7.

11. An optical communication system, characterized in that: The communication system includes a first optical communication device, an optical distribution network, and a second optical communication device, wherein the first optical communication device is connected to the second optical communication device via the optical distribution network, and the second optical communication device is used to perform the method for identifying a downlink port of an optical distribution network according to any one of claims 1 to 7.

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