CN110996193B

CN110996193B - Method, related device and system for identifying optical network unit connection port

Info

Publication number: CN110996193B
Application number: CN201911135661.4A
Authority: CN
Inventors: 杨素林
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2021-10-26
Anticipated expiration: 2039-11-19
Also published as: WO2021098330A1; CN110996193A

Abstract

The embodiment of the application discloses a method for identifying an ONU (optical network unit) connection port, an optical splitter supporting port identification, related equipment such as an ONU (optical network unit), an OLT (optical line terminal) and the like, a PON (passive optical network) and a communication system. When an ONU connected with a certain port of the optical splitter sends an uplink test optical signal, the uplink test optical signal is reflected by a reflector arranged at the port connected with the ONU so as to form an echo optical signal. The intensity of the echo optical signal has a corresponding relation with the reflectivity of the reflector, and the reflectivity of the reflector has a corresponding relation with the information of the port where the reflector is located, so that the intensity of the echo optical signal has a corresponding relation with the information of the port connected with the ONU. Thereby obtaining the information of the port of the optical splitter connected with the ONU. And then can also obtain the topological structure of PON, the quick fault location of being convenient for.

Description

Method, related device and system for identifying optical network unit connection port

Technical Field

The present application relates to Optical communication technologies, and in particular, to a method, a related apparatus, and a system for identifying a connection port of an Optical Network Unit (ONU) device.

Background

A Passive Optical Network (PON) system includes an Optical Line Terminal (OLT), an Optical Distribution Network (ODN), and a plurality of ONUs or Optical Network Terminals (ONTs) located at a user side.

The upstream and downstream optical signals of the PON system can be transmitted in the same optical fiber. Optical signals in a downlink direction (from the OLT to the ONUs) work in a Time Division Multiplexing (TDM) mode, and data sent by the OLT is broadcasted to all branch optical fibers and reaches all the ONUs; optical signals in the upstream direction (ONU to OLT) operate in a Time Division Multiple Access (TDMA) mode, and the ONU transmits only in authorized Time slots. Of course, the uplink and downlink optical signals may be transmitted in different optical fibers.

The ODN may transmit optical signals between the OLT and the plurality of ONUs. The ODN topological structure is relatively complex, and the connection relation between the ONU and the optical splitter in the ODN is also changed frequently, so that difficulties are brought to operation and maintenance personnel for fault location and fault elimination.

Disclosure of Invention

The embodiment of the application provides a method, a device and a system for identifying an ONU connection port of an optical network unit.

In a first aspect, an embodiment of the present application provides a method for identifying an ONU connection port, including: the ONU transmits a first upstream optical signal (upstream test optical signal), and receives an echo optical signal generated by the first upstream optical signal in an optical fiber network, where the optical fiber network may specifically be an ODN; and the ONU acquires the intensity information of the echo optical signal and determines the information of a first port of a final-stage optical splitter connected with the ONU according to the intensity information of the echo optical signal, wherein the intensity information of the echo optical signal and the information of the first port have a corresponding relation. In the embodiment of the present application, the ONU receives an echo optical signal generated by the first upstream optical signal in the optical fiber network, and determines which port of the last optical splitter, i.e. the first port, the ONU is connected to according to the strength information of the echo optical signal. If the ONU has the problems of poor network connection, poor network signals and the like, operation and maintenance personnel can quickly position the port connected with the ONU or the optical fiber link corresponding to the port according to the information of the first port of the ONU, so that quick fault positioning and fault elimination are facilitated.

In one possible design, the echo optical signal includes a first part of the first uplink optical signal reflected by the reflector disposed at the first port, and the correspondence between the intensity information of the echo optical signal and the information of the first port is based on the correspondence between the reflectivity of the reflector disposed at the first port and the information of the first port. The intensity of the first part of optical signal is corresponding to the reflectivity of the reflector arranged at the first port, so that the intensity information of the echo optical signal is corresponding to the reflectivity of the reflector arranged at the first port. The greater the reflectivity of the reflector arranged at the first port is, the greater the intensity of the echo optical signal is. And because there is a corresponding relation between the reflectivity of the reflector arranged at the first port and the information of the first port, the corresponding relation between the intensity information of the echo optical signal and the information of the first port can be obtained. The reflector is arranged at the port of the final-stage optical splitter, and the reflectivity of the reflector has a corresponding relation with the information of the port where the reflector is located, so that the intensity information of the echo optical signal has a corresponding relation with the information of the first port, the determination result of the ONU on the information of the first port is more accurate, and the influence of noise generated by other reflection points (such as mechanical connection) on the determination result is reduced.

In one possible design, the ONU sends a second upstream optical signal (upstream service optical signal) to an optical line terminal OLT, where the second upstream optical signal is used to request the OLT to authorize the ONU to send the first upstream optical signal. The ONU requests the OLT for authorization of the connection port test so as to ensure that the test can be normally carried out and the transmission of service data is not influenced.

In a possible design, the ONU receives a first downlink optical signal sent by an OLT, where the first downlink optical signal carries indication information indicating that the ONU sends the first uplink optical signal, and/or time information indicating that the ONU sends the first uplink optical signal. The ONU sends the uplink test signal in the allocated time slot according to the indication of the OLT, so that the normal operation of the connection port test can be ensured, and the efficiency and the accuracy of the test are improved.

In one possible design, the ONU determines the connection relationship between the ONU and the optical fiber network according to the information of the first port. The ONU can further determine the connection relationship between the ONU and the ODN according to the information of the first port and the topological structure of the ODN stored by the ONU; or the ONU may determine, according to the intensity information of the echo optical signal, information of a second port connected to a last optical splitter connected to the ONU, and further determine, according to the information of the first port and the information of the second port, a connection relationship between the ONU and the ODN. The method is convenient for accurately and efficiently acquiring the topological structure of the PON, thereby facilitating fault location and fault elimination.

In one possible design, the ONU sends a third uplink optical signal (uplink service optical signal) to the OLT, where the third uplink optical signal carries information of the first port or a connection relationship between the ONU and the optical fiber network. Therefore, the OLT can acquire the connection relation of the ONU, and further the acquisition of the topological structure of the PON is facilitated.

In one possible design, the first uplink optical signal and the second uplink optical signal or the third uplink optical signal have the same wavelength. That is, the wavelength of the uplink test signal is the same as that of the uplink service signal, the transmitter of the ONU that transmits the uplink service signal may also be used to transmit the uplink test signal.

In one possible design, the first uplink optical signal and the second uplink optical signal or the third uplink optical signal have different wavelengths. And if the wavelength of the uplink test signal is different from that of the uplink service signal, the ONU comprises an uplink test optical signal transmitter and an uplink service optical signal transmitter. Therefore, the service data transmission and the connection port test are not influenced by each other, even if the service data transmission and the connection port test are carried out simultaneously.

In one possible design, the intensity information of the echo optical signal includes a height of a first reflection peak in a reflection curve of the echo optical signal, the first reflection peak being formed based on a first portion of the first uplink optical signal reflected by a first port-disposed reflector, the height of the first reflection peak indicating an intensity of the first portion of the optical signal; the determining, by the ONU, the information of the first port according to the intensity information of the echo optical signal specifically includes: and the ONU determines the information of the first port according to the height of the first reflection peak, wherein the corresponding relation between the height of the first reflection peak and the information of the first port is based on the corresponding relation between the reflectivity of a reflector arranged at the first port and the information of the first port. The ONU may store a correspondence between the height of the first reflection peak and the information of the first port, and the ONU may determine the information of the first port according to the intensity information of the echo optical signal and the correspondence between the height of the first reflection peak and the information of the first port.

In one possible design, the ONU determines the information of the first port according to the strength information of the echo optical signal, further includes: the ONU determines the first reflection peak based on the difference between the distance of the first reflection peak and the distance of the attenuation event corresponding to the final splitter being less than a first distance threshold, wherein the distance of the first reflection peak is indicative of the distance between the ONU and a reflector provided at the first port. The first upstream optical signal passing through the final optical splitter will form a corresponding attenuation event. And the attenuation event is in close proximity to the first reflection peak caused by the reflector disposed at the port of the final splitter. Since the attenuation events are more easily resolved on the reflection curve, the method of determining the first reflection peak is simple and accurate.

In one possible design, the intensity information of the echo optical signal further includes a height of a second reflection peak in a reflection curve of the echo optical signal, the second reflection peak being formed based on a second part of the first uplink optical signal reflected by a reflector provided at a second port, the height of the second reflection peak indicating an intensity of the second part of the optical signal, a distance of the second reflection peak indicating a distance between the ONU and the reflector provided at the second port, the distance of the second reflection peak being greater than the distance of the first reflection peak;

the ONU also determines the information of a second port connected with a final optical splitter connected with the ONU according to the height of the second reflection peak, and the corresponding relation between the height of the second reflection peak and the information of the second port is based on the corresponding relation between the reflectivity of a reflector arranged on the second port and the information of the second port; and the ONU further determines the connection relationship between the ONU and the optical fiber network according to the information of the first port and the information of the second port.

The port of the last-stage optical splitter is provided with a reflector, and the reflectivity of the reflector corresponds to the information of the port of the previous-stage optical splitter where the reflector is located, so that the information of the second port of the ONU corresponds to the height of the second reflection peak of the echo optical signal, and the determination of which port of the previous-stage optical splitter the last-stage optical splitter connected to the ONU is connected to is facilitated. The method is convenient for accurately and efficiently acquiring the topological structure of the ODN and the topological structure of the PON.

In a second aspect, an embodiment of the present application provides a method for identifying an ONU connection port, including: the method comprises the steps that the equipment receives intensity information of an echo optical signal sent by a first Optical Network Unit (ONU), wherein the echo optical signal is an echo optical signal generated in an optical fiber network by a first uplink optical signal sent by the first ONU; the equipment determines the information of the first port of the last-stage optical splitter connected with the first ONU according to the strength information of the echo optical signal sent by the first ONU. In the embodiment of the present application, the device determines which port of the last optical splitter the first ONU is connected to, i.e., information of the first port, based on the intensity information of the echo optical signal transmitted by the first ONU. If the first ONU has the problems of poor network connection, poor network signals and the like, operation and maintenance personnel can quickly position the port connected with the first ONU or the optical fiber link corresponding to the port according to the information of the first port of the first ONU, so that quick fault positioning and fault elimination are facilitated.

In one possible design, there is a correspondence between the intensity information of the echo optical signal sent by the first ONU and the information of the first port; and the echo optical signal includes a first part of optical signal reflected by the reflector set by the first port in the first uplink optical signal, and the correspondence between the intensity information of the echo optical signal sent by the first ONU and the information of the first port is based on the correspondence between the reflectivity of the reflector set by the first port and the information of the first port. By arranging the reflector at the port of the final optical splitter, and the reflectivity of the reflector has a corresponding relation with the information of the port where the reflector is located, the intensity information of the echo optical signal (including the first part of optical signal reflected by the reflector) and the information of the first port also have a corresponding relation, so that the determination result of the device on the information of the first port of the first ONU is more accurate, and the influence of noise generated by other reflection points (such as mechanical connection) on the determination result is reduced.

In one possible design, the device determines a connection relationship between the first ONU and the optical fiber network according to the information of the first port. The device may further determine a connection relationship between the first ONU and the ODN according to the information of the first port and a topology structure of the ODN stored in the device; or the device may determine, according to the strength information of the echo optical signal sent by the first ONU, information of a second port connected to a last optical splitter connected to the first ONU, and further determine, according to the information of the first port and the information of the second port, a connection relationship between the first ONU and the ODN. The method is convenient for accurately and efficiently acquiring the topological structure of the PON, thereby facilitating fault location and fault elimination.

In one possible design, the strength information of the echo optical signal sent by the first ONU includes a height of a first reflection peak in a reflection curve of the echo optical signal, where the first reflection peak is formed based on a first partial optical signal in the first uplink optical signal that is reflected by a reflector provided at the first port, and the height of the first reflection peak indicates the strength of the first partial optical signal;

the determining, by the device, the information of the first port according to the intensity information of the echo optical signal specifically includes: the equipment determines the information of the first port according to the height of the first reflection peak, wherein the height of the first reflection peak has a corresponding relation with the information of the first port, and the corresponding relation between the height of the first reflection peak and the information of the first port is based on the corresponding relation between the reflectivity of a reflector arranged at the first port and the information of the first port.

The device may store a correspondence between the height of the first reflection peak and the information of the first port, and the device may determine the information of the first port according to the intensity information of the echo optical signal and the correspondence between the height of the first reflection peak and the information of the first port.

In one possible design, the apparatus determines the information of the first port according to the strength information of the echo optical signal, and further includes: the device determines the first reflection peak based on a difference between a distance of the first reflection peak and a distance of a corresponding attenuation event of the final splitter being less than a first distance threshold, wherein the distance of the first reflection peak is indicative of a distance between the first ONU and a reflector disposed at the first port. The first upstream optical signal passing through the final optical splitter will form a corresponding attenuation event. And the attenuation event is in close proximity to the first reflection peak caused by the reflector disposed at the port of the final splitter. Since the attenuation events are more easily resolved on the reflection curve, the method of determining the first reflection peak is simple and accurate.

In one possible design, the strength information of the echo optical signal sent by the first ONU further includes a height of a second reflection peak in a reflection curve of the echo optical signal, where the second reflection peak is formed based on a second partial optical signal in the first uplink optical signal that is reflected by a reflector provided at a second port, the height of the second reflection peak indicates the strength of the second partial optical signal, the distance of the second reflection peak indicates the distance between the first ONU and the reflector provided at the second port, and the distance of the second reflection peak is greater than the distance of the first reflection peak;

the device further determines information of the second port according to a height of the second reflection peak, where the second port is a port of a previous-stage optical splitter connected to a last-stage optical splitter connected to the first ONU, the height of the second reflection peak and the information of the second port have a correspondence, and the correspondence between the height of the second reflection peak and the information of the second port is based on a correspondence between a reflectivity of a reflector provided by the second port and the information of the second port; and the equipment determines the connection relation between the first ONU and the optical fiber network according to the information of the first port and the information of the second port. The method is convenient for accurately and efficiently acquiring the topological structure of the ODN and the topological structure of the PON.

In one possible design, the device further receives intensity information of an echo optical signal sent by a second ONU, where the second ONU is another ONU in the optical network system except the first ONU; the equipment determines a third ONU which is connected with the same final-stage optical splitter as the first ONU according to the intensity information of the echo optical signal sent by the second ONU; and the equipment determines the information of the second port according to the intensity information of the echo optical signal sent by the third ONU. Because the distance from the ONU to the reflector arranged on the previous-stage optical splitter connected with the last-stage optical splitter is relatively long, and the transmission distances of the uplink test optical signal and the echo optical signal are relatively long, the influence of factors such as noise is large, and the error of the height of the second reflection peak is large. And determining the information of the second port according to the strength information of the echo optical signal of the third ONU connected with the same final-stage optical splitter, so that the error can be reduced, and the determined information of the second port is more accurate.

In one possible design, the apparatus further determines a fourth ONU connected to the same last-stage sub-splitter as the first ONU, based on intensity information of the echo optical signal transmitted by the second ONU, where the last-stage sub-splitter is a last-stage sub-splitter in the last-stage splitter; and the equipment determines the information of the first port according to the intensity information of the echo optical signal sent by the first ONU and the intensity information of the echo optical signal sent by the fourth ONU. And taking the fourth ONU and the first ONU which are connected with the same final-stage sub-optical splitter as a group of ONUs.

In one possible design, the determining, by the device, information of the first port specifically includes: the device determines the identifier of the last-stage sub-optical splitter connected to the corresponding first ONU according to the intensity information of the echo optical signal sent by the first ONU and/or the intensity information of the echo optical signal sent by the fourth ONU, that is, the device determines to which last-stage sub-optical splitter the first ONU is connected; the device further determines information of the first port according to the intensity information of the echo optical signal sent by the first ONU and the intensity information of the echo optical signal sent by the fourth ONU, for example, the sizes of the two are compared. I.e. the device further determines to which port of the final sub-splitter the first ONU is connected.

In one possible design, the apparatus is an optical line terminal OLT, and the method further includes: the OLT sends a first downlink optical signal, wherein the first downlink optical signal carries indication information indicating that the first ONU sends the first uplink optical signal, and/or time information indicating that the first ONU sends the first uplink optical signal. The ONU sends the uplink test signal in the allocated time slot according to the indication of the OLT, so that the normal operation of the connection port test can be ensured, and the efficiency and the accuracy of the test are improved.

In a possible design, the OLT sends a second downlink optical signal, where the second downlink optical signal carries indication information indicating that the first ONU acquires the intensity information of the echo optical signal, and/or time information indicating that the first ONU acquires the intensity information of the echo optical signal.

In one possible design, the OLT sends a third downlink optical signal, where the third downlink optical signal carries indication information indicating that the first ONU and the second ONU acquire the intensity information of the echo optical signal, and/or time information indicating that the first ONU and the second ONU acquire the intensity information of the echo optical signal. And the first ONU sends the uplink test signal, and all the ONUs acquire the intensity information of the echo optical signal of the uplink test signal according to the indication of the OLT, so that the normal operation of the connection port test can be ensured, and the test accuracy is improved.

In one possible design, the device is a network management server. The method for receiving the intensity information of the echo optical signal sent by the first ONU by the device specifically includes: the network management equipment receives the intensity information of the echo optical signal, which is sent by the OLT and acquired by the first ONU.

In a third aspect, an embodiment of the present application provides an optical network unit ONU, including: an uplink optical signal transmitter for transmitting a first uplink optical signal; the echo optical signal receiver is used for receiving an echo optical signal generated by the first uplink optical signal in the optical fiber network; and the processing module is configured to acquire intensity information of the echo optical signal, and determine information of a first port of a last optical splitter connected to the ONU according to the intensity information of the echo optical signal, where there is a correspondence between the intensity information of the echo optical signal and the information of the first port.

In one possible design, the echo optical signal includes a first part of the first uplink optical signal reflected by the reflector disposed at the first port, and the correspondence between the intensity information of the echo optical signal and the information of the first port is based on the correspondence between the reflectivity of the reflector disposed at the first port and the information of the first port.

In a possible design, the upstream optical signal transmitter is further configured to send a second upstream optical signal to an optical line terminal OLT, where the second upstream optical signal is used to request the OLT to authorize the ONU to send the first upstream optical signal.

In one possible design, the ONU further comprises: the downlink optical signal receiver is configured to receive a first downlink optical signal sent by an optical line terminal OLT, where the first downlink optical signal carries indication information indicating that the ONU sends the first uplink optical signal, and/or time information indicating that the ONU sends the first uplink optical signal.

In a possible design, the processing module is further configured to determine a connection relationship between the ONU and the optical fiber network according to the information of the first port.

In a possible design, the uplink optical signal transmitter is further configured to send a third uplink optical signal to the OLT, where the third uplink optical signal carries information of the first port or a connection relationship between the ONU and the optical fiber network.

In one possible design, the first uplink optical signal, the second uplink optical signal, the third uplink optical signal, and the echo optical signal have the same wavelength.

In one possible design, the upstream optical signal transmitter includes a first upstream optical signal transmitter and a second upstream optical signal transmitter, the first upstream optical signal transmitter is configured to transmit the first upstream optical signal; the second uplink optical signal transmitter is configured to transmit the second uplink optical signal or the third uplink optical signal; the first uplink optical signal and the echo optical signal have the same wavelength; the first uplink optical signal and the second uplink optical signal or the third uplink optical signal have different wavelengths.

In one possible design, the intensity information of the echo optical signal includes a height of a first reflection peak in a reflection curve of the echo optical signal, the first reflection peak being formed based on a first portion of the first uplink optical signal reflected by a first port-disposed reflector, the height of the first reflection peak indicating an intensity of the first portion of the optical signal;

the processing module is configured to determine information of the first port according to the intensity information of the echo optical signal, and specifically includes: the processing module is configured to determine information of the first port according to a height of the first reflection peak, where a correspondence between the height of the first reflection peak and the information of the first port is based on a correspondence between a reflectivity of a reflector provided at the first port and the information of the first port.

In one possible design, the strength information of the echo optical signal further includes a height of a second reflection peak in a reflection curve of the echo optical signal, the second reflection peak being formed based on a second part of the first uplink optical signal reflected by a reflector provided by a second port, the height of the second reflection peak indicating the strength of the second part of the optical signal, the distance of the second reflection peak indicating the distance between the ONU and the reflector provided by the second port, the distance of the first reflection peak indicating the distance between the ONU and the reflector provided by the first port, the distance of the second reflection peak being greater than the distance of the first reflection peak;

the processing module is further configured to determine information of the second port according to a height of the second reflection peak, where the second port is a port of a previous-stage optical splitter connected to a last-stage optical splitter connected to the ONU, and a correspondence between the height of the second reflection peak and the information of the second port is based on a correspondence between a reflectivity of a reflector provided by the second port and the information of the second port; the processing module is further configured to determine a connection relationship between the ONU and the optical fiber network according to the information of the first port and the information of the second port.

The technical effects brought by any one of the solutions in the third aspect may be referred to the technical effects brought by different solutions in the first aspect, and are not described herein again.

In a fourth aspect, an embodiment of the present application provides an apparatus for identifying an ONU connection port, where the apparatus includes: the optical network unit comprises a receiver and a control unit, wherein the receiver is used for receiving intensity information of an echo optical signal sent by a first optical network unit ONU, and the echo optical signal is an echo optical signal generated in an optical fiber network by a first uplink optical signal sent by the first ONU; and the processing module is used for determining the information of the first port of the last-stage optical splitter connected with the first ONU according to the strength information of the echo optical signal sent by the first ONU.

In one possible design, there is a correspondence between the intensity information of the echo optical signal sent by the first ONU and the information of the first port; and the echo optical signal includes a first part of optical signal reflected by the reflector set by the first port in the first uplink optical signal, and the correspondence between the intensity information of the echo optical signal sent by the first ONU and the information of the first port is based on the correspondence between the reflectivity of the reflector set by the first port and the information of the first port.

In a possible design, the processing module is further configured to determine a connection relationship between the first ONU and the optical fiber network according to the information of the first port.

the processing module is configured to determine information of the first port according to the intensity information of the echo optical signal, and includes: the processing module is configured to determine information of the first port according to a height of the first reflection peak, where there is a correspondence between the height of the first reflection peak and the information of the first port, and the correspondence between the height of the first reflection peak and the information of the first port is based on a correspondence between a reflectivity of a reflector provided at the first port and the information of the first port.

In one possible design, the strength information of the echo optical signal sent by the first ONU further includes a height of a second reflection peak in a reflection curve of the echo optical signal, where the second reflection peak is formed based on a second partial optical signal in the first uplink optical signal that is reflected by a reflector provided at a second port, the height of the second reflection peak indicates the strength of the second partial optical signal, a distance of the second reflection peak indicates a distance between the first ONU and the reflector provided at the second port, a distance of the first reflection peak indicates a distance between the first ONU and the reflector provided at the first port, and a distance of the second reflection peak is greater than a distance of the first reflection peak;

the processing module is further configured to determine information of the second port according to the height of the second reflection peak. The second port is a port of a previous-stage optical splitter connected to a last-stage optical splitter connected to the first ONU, a correspondence relationship exists between a height of the second reflection peak and information of the second port, and the correspondence relationship between the height of the second reflection peak and the information of the second port is based on a correspondence relationship between a reflectivity of a reflector provided by the second port and the information of the second port; the processing module is further configured to determine a connection relationship between the first ONU and the optical fiber network according to the information of the first port and the information of the second port.

In a possible design, the receiver is further configured to receive intensity information of an echo optical signal sent by a second ONU, where the second ONU is another ONU in the optical network system except the first ONU; the processing module is further configured to determine, according to intensity information of an echo optical signal sent by the second ONU, a third ONU connected to the same last-stage optical splitter as the first ONU; the processing module is further configured to determine information of the second port according to the intensity information of the echo optical signal sent by the third ONU.

In a possible design, the processing module is further configured to determine, according to intensity information of an echo optical signal transmitted by the second ONU, a fourth ONU connected to the same last-stage optical splitter as the first ONU, where the last-stage optical splitter is a last-stage optical splitter in the last-stage optical splitters; the processing module is further configured to determine information of the first port according to the intensity information of the echo optical signal sent by the first ONU and the intensity information of the echo optical signal sent by the fourth ONU.

In a possible design, the determining information of the first port according to the strength information of the echo optical signal sent by the first ONU and the strength information of the echo optical signal sent by the fourth ONU specifically includes: determining the identifier of the corresponding last-stage sub-optical splitter connected with the first ONU according to the intensity information of the echo optical signal sent by the first ONU and/or the intensity information of the echo optical signal sent by the fourth ONU; and based on the identification of the last-stage sub-optical splitter connected with the first ONU, further determining the information of the first port according to the intensity information of the echo optical signal sent by the first ONU and the intensity information of the echo optical signal sent by the fourth ONU.

In a possible design, the device is an optical line terminal OLT, and the receiver is an uplink optical signal receiver. The OLT further comprises: and the downlink optical signal transmitter is configured to transmit a first downlink optical signal, where the first downlink optical signal carries indication information indicating that the first ONU transmits the first uplink optical signal, and/or time information indicating that the first ONU transmits the first uplink optical signal.

In a possible design, the downlink optical signal transmitter is further configured to transmit a second downlink optical signal, where the second downlink optical signal carries indication information indicating that the first ONU acquires the intensity information of the echo optical signal, and/or time information indicating that the first ONU acquires the intensity information of the echo optical signal.

In a possible design, the downlink optical signal transmitter is further configured to transmit a third downlink optical signal, where the third downlink optical signal carries indication information indicating that the first ONU and the second ONU acquire the intensity information of the echo optical signal, and/or time information indicating that the first ONU and the second ONU acquire the intensity information of the echo optical signal.

In one possible design, the device is a network management server.

The technical effects brought by any one of the solutions in the fourth aspect can be referred to the technical effects brought by different solutions in the second aspect, and are not described herein again.

In a fifth aspect, an embodiment of the present application provides an optical splitter supporting port identification, where the optical splitter supporting port identification includes 1 or 2 first side ports and N second side ports; the first side port is used for connecting a previous-stage optical splitter or an OLT, and the second side port is used for connecting a next-stage optical splitter or an ONU; at least (N-1) second side ports in the N second side ports are provided with first reflectors, and the port information of the second side ports and the reflectivity of the first reflectors of the second side ports have a corresponding relation, wherein N is an integer larger than 1.

When the uplink optical signal is transmitted to the first reflector, part of the optical signal is reflected, so that an echo optical signal of the uplink optical signal is formed. The intensity information of the echo optical signal has a corresponding relation with the reflectivity of the first reflector. Furthermore, according to the correspondence between the reflectivity of the first reflector and the port information of the second side port where the first reflector is located, the correspondence between the intensity information of the echo optical signal and the port information of the second side port where the first reflector is located can be determined.

In a sixth aspect, an embodiment of the present application provides an optical splitter supporting port identification, where the optical splitter supporting port identification includes 1 or 2 first side ports and N second side ports; the first side port is used for connecting a previous-stage optical splitter or an OLT, the second side port is used for connecting a next-stage optical splitter or an ONU, and N is an integer greater than 1;

the port identification supporting optical splitter comprises P last-stage sub-optical splitters, the last-stage sub-optical splitter is the last-stage sub-optical splitter in the port identification supporting optical splitter, the last-stage sub-optical splitter comprises 1 or 2 third side ports and Q fourth side ports, the third side ports are used for being connected with the previous-stage sub-optical splitter or suspended, the fourth side ports of the last-stage sub-optical splitter are the second side ports of the port identification supporting optical splitter, P is a positive integer, and Q is an integer larger than 1;

1 of said third side ports of each of said final sub-splitters is provided with a second reflector, and at least Q-1 of the fourth side ports of each of said final sub-splitters is provided with a third reflector; wherein the identifier of the final sub-splitter corresponds to a reflectivity of the second reflector of the final sub-splitter, or the identifier of the final sub-splitter corresponds to a reflectivity of the third reflector of the final sub-splitter.

In one possible design, 1 third side port of the final sub-splitter is connected to the previous sub-splitter, and the other 1 third side port of the final sub-splitter is suspended; 1 of the third side ports of each of the final sub-splitters is provided with a second reflector, specifically comprising: the suspended third side port of each final sub-splitter is provided with the second reflector.

In a seventh aspect, an embodiment of the present application provides a passive optical network system, including an optical line terminal OLT and an optical network unit ONU, where the ONU is configured to execute the method in any one of the first aspect; the OLT is used for receiving the information of the first port of the last-stage optical splitter connected with the ONU reported by the ONU or the connection relation between the ONU and the optical fiber network.

For technical effects brought by any one of the solutions in the seventh aspect, reference may be made to technical effects brought by different solutions in the first aspect, and details are not described here.

In an eighth aspect, an embodiment of the present application provides a passive optical network system, including an optical line terminal OLT and a first optical network unit ONU, where the OLT is configured to execute a method executed by the OLT in any of the solutions of the second aspect; the first ONU is used for sending a first uplink optical signal.

In a possible design, the passive optical network system further includes a second ONU, where the second ONU is another ONU in the passive optical network system except the first ONU, and the second ONU is configured to report, to the OLT, intensity information of an echo optical signal generated by the first optical signal in the optical fiber network.

The technical effects brought by any one of the solutions in the eighth aspect can be referred to the technical effects brought by different solutions in the second aspect, and are not described herein again.

In a ninth aspect, an embodiment of the present application provides a passive optical network system, including an optical line terminal OLT, an optical distribution network ODN, and a plurality of optical network units ONU, where the OLT is connected to the plurality of ONUs through the ODN, and at least one ONU of the plurality of ONUs is the ONU according to any one of the third aspects.

In one possible design, the ODN includes a last optical splitter including a first side port for connecting to a previous stage optical splitter or the OLT and a second side port for connecting to the plurality of ONUs; a first reflector is arranged on a second side port connected with the at least one ONU, and the port information of the second side port and the reflectivity of the first reflector of the second side port have a corresponding relation; and the second side port to which the at least one ONU is connected is the first port of the at least one ONU.

In one possible design, the ODN includes a last optical splitter including a first side port for connecting to a previous stage optical splitter or the OLT and a second side port for connecting to the plurality of ONUs; the last-stage optical splitter includes P last-stage optical splitters, the last-stage optical splitter is a last-stage optical splitter in the last-stage optical splitters, the last-stage optical splitter includes 1 or 2 third side ports and Q fourth side ports, the third side port is connected with a previous-stage optical splitter or is suspended, the fourth side port of the last-stage optical splitter is a second side port of the last-stage optical splitter, P is a positive integer, and Q is an integer greater than 1; wherein 1 of said third side ports of each of said final sub-splitters is provided with a second reflector and at least Q-1 of said fourth side ports of each of said final sub-splitters is provided with a third reflector; wherein the identifier of the final sub-splitter corresponds to a reflectivity of the second reflector of the final sub-splitter, or the identifier of the final sub-splitter corresponds to a reflectivity of the third reflector of the final sub-splitter.

The technical effects brought by any one of the solutions in the ninth aspect may refer to the technical effects brought by different solutions in the first aspect, and are not described herein again.

In a tenth aspect, an embodiment of the present application provides a passive optical network system, including an optical line terminal OLT, an optical distribution network ODN, and a plurality of optical network units ONU, where the OLT is connected to the plurality of ONUs through the ODN, and the OLT is configured to execute the method executed by the OLT in any aspect of the second aspect.

In one possible design, the ODN includes a final optical splitter including a first side port for connecting to a previous stage optical splitter or the OLT and a second side port for connecting to the ONU; each second side port is provided with a first reflector, and port information of the second side port and the reflectivity of the first reflector of the second side port have a corresponding relation; and the second side port to which the ONU is connected is the first port of the ONU.

In one possible design, the ODN includes a final optical splitter including a first side port for connecting to a previous stage optical splitter or the OLT and a second side port for connecting to the ONU; the last-stage optical splitter includes P last-stage optical splitters, the last-stage optical splitter is a last-stage optical splitter in the last-stage optical splitters, the last-stage optical splitter includes 1 or 2 third side ports and Q fourth side ports, the third side port is connected with a previous-stage optical splitter or is suspended, the fourth side port of the last-stage optical splitter is a second side port of the last-stage optical splitter, P is a positive integer, and Q is an integer greater than 1; wherein 1 of said third side ports of each of said final sub-splitters is provided with a second reflector and at least Q-1 of said fourth side ports of each of said final sub-splitters is provided with a third reflector; wherein the identifier of the final sub-splitter corresponds to a reflectivity of the second reflector of the final sub-splitter, or the identifier of the final sub-splitter corresponds to a reflectivity of the third reflector of the final sub-splitter.

For technical effects brought by any one of the solutions in the tenth aspect, reference may be made to technical effects brought by different solutions in the first aspect, and details are not described here.

In an eleventh aspect, an embodiment of the present application provides a communication system, including a network management device, and a passive optical network system, where the passive optical network system is configured to send, to the network management device, strength information of an echo optical signal generated in an optical fiber network by a first uplink optical signal acquired by a first ONU and/or a second ONU, where the first ONU is an ONU that sends the first uplink optical signal, and the second ONU is another ONU in the passive optical network system except the first ONU; the network management device is configured to perform any of the methods of the second aspect.

The technical effects brought by any one of the solutions in the eleventh aspect can be referred to the technical effects brought by different solutions in the second aspect, and are not described herein again.

In a twelfth aspect, an embodiment of the present application provides an apparatus for identifying an ONU connection port, which includes a memory and a processor; the memory is for storing computer executable instructions which, when executed by the apparatus, cause the apparatus to perform the method of any aspect of the first aspect.

In a thirteenth aspect, an embodiment of the present application provides an apparatus for identifying an ONU connection port, including a memory and a processor; the memory is configured to store execution instructions, and when the apparatus is running, the processor executes the execution instructions stored by the memory to cause the apparatus to perform the method of any aspect of the second aspect.

In a fourteenth aspect, the present application provides a readable storage medium, where an execution instruction is stored in the readable storage medium, and when at least one processor of an ONU executes the execution instruction, the ONU executes the method in any aspect of the first aspect.

In a fifteenth aspect, the present application provides a readable storage medium having stored therein execution instructions that, when executed by at least one processor of a device, perform the method of any aspect of the second aspect.

In a sixteenth aspect, the present application provides a program product comprising execution instructions, the execution instructions being stored in a readable storage medium. The at least one processor of the ONU may read the execution instructions from the readable storage medium, and the execution of the execution instructions by the at least one processor causes the ONU to perform the method in any aspect of the first aspect.

In a seventeenth aspect, the present application provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the device may read the execution instructions from the readable storage medium, and the execution of the execution instructions by the at least one processor causes the device to perform the method of any aspect of the second aspect.

Drawings

Fig. 1 is a schematic structural diagram of a passive optical network system according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a reflection curve obtained by an ONU according to an embodiment of the present disclosure;

fig. 3A is a schematic structural diagram of a light splitter according to an embodiment of the present disclosure;

fig. 3B is a schematic structural diagram of another optical splitter according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an OLT according to an embodiment of the present application;

fig. 5A is a schematic structural diagram of an ONU according to an embodiment of the present application;

fig. 5B is a schematic structural diagram of another ONU provided in the embodiment of the present application;

fig. 6A is a schematic structural diagram of a reflector according to an embodiment of the present disclosure;

fig. 6B is a schematic structural diagram of another reflector provided in the embodiment of the present application;

fig. 7 is a method for identifying an ONU connection port according to an embodiment of the present disclosure;

fig. 8A is a schematic diagram of reflection curves of a plurality of ONUs according to an embodiment of the present disclosure;

fig. 8B is a schematic diagram of a reflection curve of an ONU1 according to an embodiment of the present disclosure;

fig. 9 is another method for identifying an ONU connection port according to an embodiment of the present application;

fig. 10 is a schematic diagram of a PON system according to an embodiment of the present application;

fig. 11 is a schematic diagram of an intensity distribution of an echo optical signal of an ONU4 measured by each ONU according to an embodiment of the present disclosure;

fig. 12 is a flowchart of another method for identifying an ONU connection port according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of an apparatus according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In the description of the present application, the term "plurality" means two or more than two unless otherwise specified. Further, "/" indicates a relationship where the contextually relevant objects are an "or", for example, a/B may indicate a or B; in the present application, "and/or" is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. In addition, in order to facilitate clear description of technical solutions of the embodiments of the present application, in the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance. It should also be noted that, unless otherwise specified, a specific description of some features in one embodiment may also be applied to explain that other embodiments refer to corresponding features.

Please refer to fig. 1, which is a schematic diagram of a system architecture according to an embodiment of the present application. The system comprises: a passive optical network PON system 100, and a network management server 140 coupled to the passive optical network PON system 100. The Network management server 140 may be a server in the Internet, a Community Access Television (CATV) Network, a Public Switched Telephone Network (PSTN), a Network operation and maintenance center (NOC), a cloud computing platform, and the like.

The PON system 100 comprises at least one optical line termination OLT110, a plurality of optical network units ONU (devices) 120 and an optical distribution network ODN 130. It should be understood that the network management server 140 may also be a device in the PON system 100, and the network management server 140 is coupled with the OLT 110. In this application, the OLT110 is connected to the ONUs 120 through the ODN 130. Here, the direction from the OLT110 to the ONU120 is defined as a downlink direction, and the direction from the ONU120 to the OLT110 is defined as an uplink direction.

The PON system 100 may be a communication network that does not require any active devices to implement data distribution between the OLT110 and the ONUs 120. For example, in a specific embodiment, data distribution between the OLT110 and the ONUs 120 may be implemented by passive optical components (e.g., optical splitters) in the ODN 130. The PON system 100 may be an Asynchronous Transfer Mode Passive Optical Network (ATM PON) system or a Broadband Passive Optical Network (BPON) system defined by the ITU-T g.983 standard, a Gigabit Passive Optical Network (GPON) system defined by the ITU-T g.984 standard, an Ethernet Passive Optical Network (Ethernet Passive Optical Network, EPON) system defined by the IEEE 1002.3ah standard, or a Next Generation Passive Optical Network (Next-Generation Passive Optical Network, NG PON), such as a 10Gigabit Passive Optical Network (10Gigabit Passive Optical Network, XGPON) or a 10Gigabit Ethernet Passive Optical Network (10Gigabit Ethernet Passive Optical Network, 10 GEPON), which are all incorporated by reference in the present application.

The OLT110 is typically located at a Central location (e.g., a Central Office, CO) that may collectively manage one or more ONUs 120. The OLT110 may act as an intermediary between the ONUs 120 and the network management device 140, forward data received from the network management device 140 as downstream data to the ONUs 120 through the ODN130, and forward upstream data received from the ONUs 120 to the network management device 140.

The ONUs 120 may be distributively located at customer-side locations (e.g., customer premises). The ONUs 120 may be devices for communicating with the OLT110 and users, and in particular, the ONUs 120 may act as an intermediary between the OLT110 and the users. For example, the ONUs 120 may forward downstream data received from the OLT110 to the user, and forward data received from the user as upstream data to the OLT110 through the ODN 130. It should be understood that Optical Network Terminals (ONTs) are commonly used in end users, such as Optical cats; the ONU120 may be applied to an end user, or may be connected to the end user through another network (e.g., ethernet). In the present application, the ONU120 is taken as an example for description, and the ONU120 and the ONT may be interchanged with each other.

The ODN130 may include optical fibers, optical couplers, optical splitters, and/or other devices. In one embodiment, the optical fiber, optical coupler, optical splitter, and/or other device may be a passive optical device. That is, the optical fiber, optical coupler, optical splitter, and/or other device may be a device that does not require power support to distribute data signals between the OLT110 and the ONUs 120. Additionally, in other embodiments, the ODN130 may also include one or more active devices, such as optical amplifiers or Relay devices (Relay devices). In the branching structure shown in fig. 1, the ODN130 may specifically extend from the OLT110 to the ONUs 120 in a two-level optical splitting manner, but may also be configured in any other point-to-multipoint (e.g., one-level optical splitting or multi-level optical splitting) or point-to-point structure. The embodiment of the present application describes two-stage light splitting as an example, and the first-stage light splitting and the multi-stage light splitting (three-stage and above light splitting) are similar, and the present application does not limit this.

Referring to fig. 1, the ODN130 employs optical splitters for data distribution, and for reliability and operation and maintenance, the ODN130 may be deployed in a two-stage optical splitting manner, including a first-stage optical splitter 131 and a plurality of second-stage optical splitters 132. The common end of the first-stage optical splitter 131 is connected to the OLT110 through a trunk Fiber (Feed Fiber)133, and the branch ends thereof are correspondingly connected to the common end of the second-stage optical splitters 132 through distribution fibers (distribution fibers) 134, respectively, and the branch end of each second-stage optical splitter 132 is further connected to the upstream interface 1201 of the corresponding optical network terminal 120 through a branch Fiber (Drop Fiber)135, respectively. In the downlink direction, the downlink data signal sent by the OLT110 is first split by the first-stage optical splitter 131, and then split by the second-stage optical splitter 132 for the second time, so as to form multiple downlink optical signals and transmit the multiple downlink optical signals to each ONU 120. In the upstream direction, the upstream data signals transmitted by the ONUs 120 sequentially pass through the second-stage optical splitter 132 and the first-stage optical splitter 131, are combined, and are transmitted to the OLT 110. The first-stage Optical splitter 131 may be disposed in an Optical Distribution Frame (ODF) closer to the central office, and the second-stage Optical splitter 132 may be disposed in a Remote Node (RN). For the deployment mode of the second-stage optical splitter, the second-stage optical splitter 132 is a final-stage optical splitter, and the first-stage optical splitter 131 is a previous-stage optical splitter connected to the final-stage optical splitter; for the arrangement mode of the first-stage light splitting, the first-stage light splitter is the final-stage light splitter; for the deployment mode of three-stage light splitting, the third-stage light splitter is a final-stage light splitter, the second-stage light splitter is a previous-stage light splitter connected with the final-stage light splitter, and the first-stage light splitter is a previous-stage light splitter connected with the second-stage light splitter. As can be seen from the above, the former-stage optical splitter in this application refers to an optical splitter closer to the OLT 110.

Some terms that will be used in this application will be briefly described below.

The echo optical signal is a signal generated by backscattering and/or reflection of an uplink test optical signal sent by the ONU120 during transmission of the ODN 130. The intensity information of the echo optical signal refers to a measurement parameter that can characterize the power or amplitude magnitude of the echo optical signal, such as the instantaneous amplitude, the instantaneous power, the average power, the height of the reflection peak of the reflection curve, and the like of the echo optical signal. It should be understood that when the intensity information includes an instantaneous amplitude, the intensity information may further include a time of the instantaneous amplitude, for example, a time delay with respect to a transmission time instant of the upstream test optical signal; when the intensity information includes the height of the reflection peak of the reflection curve, the intensity information may further include the distance of the reflection peak.

Those skilled in the art will appreciate that the reflection curve may record the distance traveled by the echo light signal and the intensity of the echo light signal. The reflection curve may be specifically referred to as an Optical Time Domain Reflectometer (OTDR) curve, or may have other names, and the present application is not limited thereto. In this application, the echo optical signal is an echo optical signal generated by an upstream test optical signal in an optical fiber network.

Fig. 2 is a schematic diagram of a reflection curve obtained by the ONU 120. Illustratively, the abscissa of the reflection curve is the distance traveled by the echo optical signal, and the ordinate is the power of the echo optical signal. It should be understood that the abscissa of the reflection curve may also be the time of transmission of the echo optical signal, and the time of transmission of the echo optical signal multiplied by the transmission speed is equal to the distance of transmission of the echo optical signal, and therefore, the time of transmission of the echo optical signal may be considered to be indicative of the distance of transmission of the echo optical signal.

The region of the curve where the slope of the reflection curve changes may be referred to as an event. For example, at attenuation event 1, attenuation event 2 in the graph, the reflection curve drops and the slope is greater than the first slope threshold. The attenuation event may be caused by the transmission of an optical signal through an optical splitter, a fiber splice, or a fiber bend, among others. For example, at reflection event 1 and reflection event 2 in the figure, the reflection curve rises and the slope is greater than the second slope threshold, and a reflection peak is formed. A reflection peak represents a reflection event and thus in this application, a reflection peak and a reflection event may be interchanged. The reflection peak may be caused by the transmission of the upstream test optical signal through a reflection point, a reflector, a mechanical connection, or the like. The distance of the reflection peak indicates the distance of transmission of the echo light signal forming the reflection peak. Specifically, the echo optical signal is transmitted by the distance of the reflection peak and then received by the ONU 120. The distance of the reflection peak may be represented by an abscissa of the reflection peak in a reflection curve, and specifically may be represented by an abscissa of a highest point, a starting point, a central point, or the like of the reflection peak. The height of the reflection peak indicates the intensity of the echo light signal, and may be expressed in terms of the distance on the ordinate between the highest point and the starting point of the reflection peak or in terms of the distance on the ordinate between the highest point and the end point of the reflection peak in the reflection curve. See in particular reflection peak 1 in fig. 2.

Fig. 3A is a schematic structural diagram of a beam splitter 300-1 according to an embodiment of the present disclosure. The splitter 300-1 may be any stage of the splitter in the ODN 130. Specifically, the optical splitter 300-1 may be the first stage optical splitter 131 or the second stage optical splitter 132 in fig. 1. The optical splitter 300-1 may include 1 first side port A₁Also, 2 first side ports A can be included₁And A₂(ii) a The optical splitter 300-1 includes N second side ports, specifically, a second side port B₁、B₂、…B_NWherein N is an integer greater than 1. The beam splitter 300-1 may specifically be a Planar optical waveguide power splitter (Planar Lightwa)ve Circuit Splitter, PLC Splitter), Thin Film Filter (Thin Film Filter), or fused biconical beam Splitter.

In one embodiment, where optical splitter 300-1 is first stage optical splitter 131 of FIG. 1, then first side port A₁May be connected to the OLT110 by a trunk fiber 133; second side port B₁-B_NMay be connected to a plurality of second stage splitters 132 by distribution fibers 134. If the optical splitter 300-1 further includes a first side port A₂Then the first side port A₁And A₂Respectively connected to 2 OLTs 110, or first side ports a, by 2 trunk fibers 133₁And A₂Is connected to 1 optical switch selector by 2 trunk fibers 133 and then to 1 OLT 110. At this time, the optical splitter 300-1 may be used in a light protection switching scenario to implement backup protection. In addition, the first side port A₂And can also be suspended. Each of the second side ports may be connected to 1 corresponding second stage splitter 132 by a distribution fiber 134. It should be understood that there may be 1 or more of the second side ports floating. In this application, floating refers to not connecting other devices, ports, etc. It should be understood that the dangling ports may also be provided with protectors.

In one embodiment, if the optical splitter 300-1 is the second stage optical splitter 132 of FIG. 1, the first side port A₁May be connected to the first stage splitter 131 by a distribution fiber 134; second side port B₁-B_NMay be connected to multiple ONUs 120 via branch optical fibers 135. It should be understood that splitter 300-1 may also include a first side port A₂The connection relationship is similar to the above embodiment, and is not described again here.

The splitting ratio of the splitter 300-1 is 1 XN or 2 XN. It should be understood that the splitting ratio herein refers to the ratio of two side ports of the splitter, for example, the splitting ratio of the splitter 300-1 is 1 × N, which means that the splitter 300-1 includes 1 first side port and N second side ports, and the splitter 300-1 may also be referred to as a 1-N splitter. The optical splitter mentioned in the present application may be an equal ratio optical splitter, for example, the optical power of the N optical signals obtained by splitting through the optical splitter 300-1 is the same; the optical splitter mentioned in the present application may be an unequal splitter, for example, the optical powers of the N optical signals obtained by splitting through the optical splitter 300-1 are different. The present application is not limited by this comparison.

Alternatively, the splitter 300-1 may be composed of a plurality of sub-splitters, the splitting ratio of which is typically 1 × 2 or 2 × 2, and the plurality of sub-splitters includes 1 first-stage sub-splitter S ₁₁2 second-stage sub-splitters S₂₁、S₂₂…, and P final sub-splitters S_Z1、S_Z2、…S_ZY、…S_ZP(Z-th order sub-beam splitter, Z is a positive integer). Wherein, P is a positive integer, and N is 2P; y is any one positive integer from 1 to P.

First order sub-splitter S₁₁A first side port of the optical splitter 300-1, a first-stage sub-optical splitter S₁₁Each of the other side ports of the first stage sub-beam splitter S is connected to the second stage sub-beam splitter S, respectively₂₁And S₂₂(ii) a Second-stage molecular splitter (S)₂₁、S₂₂) Is connected to the first stage sub-splitter S₁₁And each of the other side ports is connected to a third stage sub-splitter (S)₃₁、S₃₂、S₃₃、S₃₄). The connection relationship of the other sub-splitters is similar, and the description is omitted here.

With a final sub-splitter S_ZYWherein Y is any positive integer from 1 to P, i.e. the final sub-splitter S_ZYAny final sub-splitter may be used. Last-stage sub-beam splitter S_ZYMay include 1 third side port C₁And 2 fourth side ports D₁And D₂Said third side port C₁Connected to the first sub-splitter, the fourth side port D₁And D₂Is the second side port of the splitter 300-1. Note that, in the present application, the final stage sub-beam splitter S_ZYMay be connected to the second side port of the optical splitter 300-1 by a waveguide or an optical fiber, for convenience of description, this case may be simply referred to as the final-stage sub-optical splitter S_ZYIs the second side port of the optical splitter 300-1. In the present application, of the fourth side portThe port information is used to indicate which port of the final sub-splitter the fourth port is, e.g. D₁、D₂Etc. and the port information of the second side port is used to indicate which port of the optical splitter 300-1 the second side port is, e.g., B₁、B₂…B_XAnd so on.

Last-stage sub-beam splitter S_ZYAnother 1 third side port C may be included₂Said third side port C₂May be suspended.

It should be understood that the splitting ratio of the sub-splitter may also be 1 × 3 or 2 × 3, and the connection relationship is similar, which is not described herein again.

In this application, the second side port of the optical splitter 300-1 is provided with a first reflector. It should be understood that the first reflector may be a reflector disposed inside the second side port of the optical splitter 300-1, or may be a reflector disposed outside the second side port of the optical splitter 300-1, for example, the first reflector is connected to the second side port through an optical fiber. The first reflector may be a reflector 600-1 shown in fig. 6A or a reflector 600-2 shown in fig. 6B.

In one embodiment, each of the N second side ports is provided with one first reflector. Specifically, the second side port B_XIs provided with a first reflector R_1XWherein X is a positive integer less than or equal to N, such as 1, 2, …, N. The reflectivity of the first reflector is in corresponding relation with the port information of the second side port where the first reflector is located. The corresponding relationship may specifically be a mapping relationship. In one embodiment, the correspondence is an increasing function mapping. To give an example of a linearly increasing function, B_XFirst reflector R of port_1XHas a reflectivity of RV₁+(X-1)ΔRV₁. For example: b is₁First reflector R of port₁₁Has a reflectivity of RV₁，B₂First reflector R of port₁₂Has a reflectivity of RV₁+ΔRV₁. It will be appreciated that the increasing functional relationship may also be other increasing functional relationships than the linear increasing function described above, such as power functions with exponentials greater than 0, bases greater than 01, etc. In one embodiment, the corresponding relationship is a decreasing function mapping relationship, such as a linear decreasing function, a power function with an exponent less than 0, and the like. In one embodiment, the correspondence is a one-to-one correspondence recorded in a tabular form. At this time, the correspondence may not satisfy the functional relationship. The following description will be made by taking table 1 as an example. It is understood that B₁-B_XIs an exemplary representation of port information. The port information of the second side port is used to identify the second side port of the optical splitter 300-1, and may specifically include a port identification, a port name, or an assigned port serial number, etc. Since the reflectivity of the first reflector has a corresponding relationship with the port information of the second side port where the first reflector is located, the reflectivity of the first reflector can also be used to identify the second side port of the optical splitter 300-1.

TABLE 1 Reflector reflectivity versus port information table for the port in which the reflector is located

Port information	Reflectivity of light
		B₁	-40dB
B₂	-35dB
		B₃	-32dB
B₄	-30dB
		…	…

When the uplink optical signal is transmitted to the first reflector, part of the optical signal is reflected, so that an echo optical signal of the uplink optical signal is formed. The intensity information of the echo optical signal has a corresponding relation with the reflectivity of the first reflector. For example, the greater the reflectivity of the first reflector, the greater the intensity of the echo light signal (e.g., the greater the power/amplitude of the echo light signal). Furthermore, according to the correspondence between the reflectivity of the first reflector and the port information of the second side port where the first reflector is located, the correspondence between the intensity information of the echo optical signal and the port information of the second side port where the first reflector is located can be determined. Therefore, the port information of the second side port through which the upstream optical signal passes can be determined according to the intensity information of the echo optical signal.

In another embodiment, N-1 of the N second side ports are each provided with a first reflector. For the N-1 ports, reference may be made to the description of the above embodiments, which are not described herein again. In this case, only one second side port is not provided with the first reflector (which is equivalent to the second side port being provided with the first reflector having a reflectivity of 0), the intensity of the echo optical signal generated by the uplink optical signal of the second side port is small, and the port information of the second side port can also be determined according to the intensity information of the echo optical signal of the uplink optical signal transmitted from the second side port.

In the optical splitter 300-1 provided in the embodiment of the present application, the first reflector is disposed at the second side port, and the reflectivity of the first reflector corresponds to the port information of the second side port where the first reflector is located, so that the second side port of the optical splitter 300-1 can be identified by the reflectivity of the first reflector at the port. Taking the final optical splitter in the PON system as the optical splitter 300-1 as an example, the first ONU120 is connected to a second side port of the optical splitter 300-1. The first ONU120 sends an upstream test optical signal, and when the upstream test optical signal is transmitted to the second side port, part of the optical signal is reflected by the first reflector at the second side port, so as to form an echo optical signal. The intensity information of the echo optical signal has a corresponding relationship with the reflectivity of the first reflector, and the reflectivity of the first reflector has a corresponding relationship with the port information of the port where the first reflector is located, so that the intensity information of the echo optical signal has a corresponding relationship with the port information of the port where the first reflector is located. Therefore, by obtaining the strength information of the echo optical signal, the port information of the port where the first reflector is located, that is, the port information of the last optical splitter connected to the ONU120, can be determined. Further, for each ONU120 in the PON system, the port information of the last-stage optical splitter connected thereto may be determined, and further, the PON topology may also be determined. When the PON system fails, the fault occurrence point can be judged quickly and correctly, and the efficiency of eliminating the fault is improved.

Fig. 3B is a schematic structural diagram of another optical splitter 300-2 according to an embodiment of the present disclosure. The structure of the optical splitter 300-2 is similar to that of the optical splitter 300-1, and as to the first side port, the second side port, the sub-optical splitter structure of the optical splitter 300-2, and the connection condition of the optical splitter 300-2, reference may be made to the description of the embodiment shown in fig. 3A, which is not described herein again.

The final sub-splitter S is described in detail here_Z1-S_ZPAnd a second reflector R₂₁-R_2PA third reflector R₃₁-R_3PHow to set up.

In one embodiment, each final stage sub-splitter includes two third side ports C₁、C₂And two fourth side ports D₁、D₂One of the third side ports C₁Another third side port C connected to the previous sub-splitter₂May be floating, and the two fourth side ports are the second side ports of the optical splitter 300-2.

As an alternative, the suspended third side port C of each final-stage sub-splitter₂Are all provided with a second counterAnd (4) an ejector. The second reflector may be internally disposed or externally disposed at the suspended third side port, and the structure of the second reflector may be as shown in fig. 6A as a reflector 600-1 or as shown in fig. 6B as a reflector 600-2. At the suspended third side port C of the final sub-splitter₂The second reflector is arranged, so that optical signal loss introduced by the second reflector can be reduced, and the influence of the second reflector on the transmission of service optical signals in the ODN network is reduced. Specifically, when the downlink optical signal is transmitted from the optical splitter 300-2, it does not pass through the floating third side port C₂And thus the downlink optical signal is not reflected by the second reflector, thereby reducing transmission loss of the downlink optical signal.

Optionally, a suspended third side port C of each final sub-splitter₂Is provided with a second reflector R_2YWherein Y is any one positive integer from 1 to P, such as 1, 2, …, P. The reflectivity of the second reflector corresponds to the mark of the final-stage sub-light splitter where the second reflector is located. The corresponding relationship may be a mapping relationship, such as an increasing function mapping relationship or a decreasing function mapping relationship. In one embodiment, the correspondence between the reflectivity of the second reflector and the identifier of the final sub-splitter in which the second reflector is located may also be a one-to-one correspondence recorded in a table format. Reference may be made specifically to the description of the embodiment shown in fig. 3A. As an example of a linear increasing function, the final sub-splitter S_ZYSecond reflector R_2YHas a reflectivity of RV₂+(Y-1)ΔRV₂. For example: last-stage sub-beam splitter S_Z1Second reflector R₂₁Has a reflectivity of RV₂Last-stage sub-splitter S_Z2Second reflector R₂₂Has a reflectivity of RV₂+ΔRV₂. The second reflector of the beam splitter 300-2 has a reflectivity in the range RV compared to the beam splitter 300-1₂～RV₂+(P-1)ΔRV₂The first reflector of the beam splitter 300-1 has a reflectivity in the range RV₁～RV₁+(N-1)ΔRV₁. When the splitting ratio of the final sub-splitter is 1:2 or 2:2, P is N/2. Therefore, when the reflectivity change accuracy Δ RV is obtained₂And Δ RV₁At the same time, the second reflector of splitter 300-2 has a smaller reflectivity range, i.e., RV, than the first reflector of splitter 300-1₂+(P-1)ΔRV₂Smaller, resulting in less optical signal loss by the reflector; when the reflectivity variation ranges of the two are the same, the reflectivity variation precision DeltaRV of the second reflector of the optical splitter 300-2₂Reflectance change accuracy Δ RV of first reflector of specific optical splitter 300-1₁And the size is larger, so that the port measurement precision of the optical splitter 300-2 is higher, and the implementation cost of the measurement equipment (test equipment or ONU120 equipment) is also reduced.

It should be understood that the identification of the last-stage sub-splitter may be used to identify the last-stage sub-splitter of the optical splitter 300-2, specifically including a serial number assigned to the last-stage sub-splitter, port information of the third port of the last-stage sub-splitter, or port information of the fourth port of the last-stage sub-splitter, and the like. Since the reflectivity of the second reflector corresponds to the identification of the final sub-splitter, the reflectivity of the second reflector can also be used to identify the final sub-splitter of splitter 300-2.

When the uplink optical signal is transmitted to the second reflector, part of the optical signal is reflected, so that an echo optical signal of the uplink optical signal is formed, and intensity information of the echo optical signal has a corresponding relation with the reflectivity of the second reflector. Furthermore, according to the correspondence between the reflectivity of the second reflector and the identifier of the last-stage sub-splitter where the second reflector is located, the correspondence between the intensity information of the echo optical signal and the identifier of the last-stage sub-splitter where the second reflector is located can be determined. And, the echo optical signal is transmitted from the fourth side port of the final-stage optical sub-splitter where the second reflector is located, and is not transmitted from the fourth side ports of the other final-stage optical sub-splitters. Therefore, by acquiring the intensity information of the echo optical signals transmitted from the plurality of fourth side ports, it is also possible to determine the fourth side ports belonging to the same final-stage sub optical splitter.

Any one of the fourth side ports of each final sub-splitter may be provided with a third reflector having a reflectivity for distinguishing between different fourth side ports in the same final sub-splitter. It should be understood that in this case, the reflectivity of the third reflectors of different final sub-splitters in the same splitter 300-2 may or may not be the same.

In particular, the final sub-splitter S_ZYFourth side port D of (2)₁Or D₂A third reflector may be provided. With the fourth side port D₁The third reflector is provided as an example for explanation. When the port D is connected with the fourth side₁The transmitted upstream optical signal is transmitted to the third reflector R_3YWhile a third part of the optical signal in the uplink optical signal is reflected by the third reflector R_3YReflect, and then from the fourth side port D₁Transmitting; the residual optical signal in the upstream optical signal is transmitted to the final sub-optical splitter S_ZYSecond reflector R_2YThen, a fourth part of the remaining optical signals is reflected, and a fifth part of the remaining optical signals is reflected from the fourth side port D₁Transmitting, from a fourth side port D, a sixth part of the fourth part of the optical signals₂And (5) transmitting. Thereby from the fourth side port D₁The transmitted echo optical signal comprises the third part optical signal and the fifth part optical signal, from a fourth side port D₂The transmitted return optical signal includes the sixth portion of the optical signal and does not include the third portion of the optical signal. Thus, from the fourth side port D₂The intensity of the transmitted echo optical signal is greater than that of the port D from the fourth side₁The strength of the transmitted echo optical signal. Thus, by comparing the intensities of the echo optical signals transmitted from the two fourth-side ports belonging to the same final-stage optical sub-splitter, it is possible to determine which port of the final-stage optical sub-splitter the two fourth-side ports are respectively.

It should be understood that if each of the Q fourth side ports of each of the final stage sub-splitters includes Q fourth side ports, Q being an integer greater than 1, one third reflector may be provided for each of the Q fourth side ports of each of the final stage sub-splitters. Or one third reflector may be provided for each of the (Q-1) fourth side ports of each final sub-splitter, and the other 1 fourth side ports are not provided with the third reflector, in which case, the other 1 fourth side ports may also be considered to be provided with the third reflector having a reflectivity of 0. And the third reflectors of different fourth side-ports in the same final sub-splitter have different reflectivities, so that the different fourth side-ports in the same final sub-splitter are distinguished by the reflectivity of the third reflectors. Specifically, the reflectivity of the third reflector corresponds to port information of a fourth port where the third reflector is located. The corresponding relationship may be a mapping relationship, such as an increasing function mapping relationship or a decreasing function mapping relationship. In addition, the corresponding relation is a one-to-one corresponding relation recorded in a table form. Reference may be made specifically to the description of the embodiment shown in fig. 3A.

The case where Q is 2 is still considered. Optionally, a suspended third side port C of each final sub-splitter₂A second reflector is provided, and the reflectivity of the second reflector of each final sub-splitter may be the same or different. A third reflector may be disposed at any one of the two fourth side ports of each final-stage sub-optical splitter, and the reflectivity of the third reflector corresponds to the port information of the second side port where the third reflector is located, that is, the reflectivity of the third reflector in different final-stage sub-optical splitters in the same optical splitter 300-2 is different. The reflectivity of the third reflector may be used to distinguish between different second side ports in the splitter 300-2. The reflectivity of the third reflector is in corresponding relation with the port information of the second side port where the third reflector is located. The corresponding relationship may be a mapping relationship, such as an increasing function mapping relationship or a decreasing function mapping relationship. In addition, the corresponding relation is a one-to-one corresponding relation recorded in a table form. Reference may be made specifically to the description of the embodiment shown in fig. 3A.

As an alternative, the third side port C of each final-stage sub-splitter, which is connected to the preceding-stage sub-splitter₁A second reflector may be provided. Also, the structure, reflectivity, and the like of the second reflector can be referred to the description of the above embodiments.

As an alternative, two third side ports C in each final-stage sub-splitter₁、C₂A second reflector (not shown) may be provided on each of the connected branches. For convenience of description, hereinafter, the two third side ports C will be described₁、C₂The branches that are all connected are referred to as common branches of the third side port. The common branch of the third side port may be an optical fiber or a waveguide. The structure, reflectivity, and other specific contents of the second reflector are similar to those of the above embodiments, and reference may be made to the description of the above embodiments, which is not described herein again.

In one embodiment, each final stage sub-splitter includes two third side ports C₁And does not include a suspended third side port C₂And the third side port C of each final-stage sub-splitter connected to the previous-stage sub-splitter₁A second reflector may be provided or a second reflector may be provided in the common branch of the third side port of each final sub-splitter, which is described above and will not be described herein.

In the splitter 300-2 provided in the embodiment of the present application, the second reflector is disposed at the suspended third side port of the last-stage sub-splitter, or the common branch to which both the two third side ports are connected, or the third side port to which the previous-stage sub-splitter is connected. If the upstream test optical signal is transmitted from a fourth side port of a final-stage optical splitter to the second reflector of the final-stage optical splitter, and is reflected to form an echo optical signal, the echo optical signal can be transmitted from the fourth side ports of the final-stage optical splitter, but not from the fourth side ports of other final-stage optical splitters. Thereby, a plurality of fourth side ports connecting the same final-stage sub-splitter can be determined.

Fig. 4 is a schematic structural diagram of the OLT110 according to an embodiment of the present application. The specific structural configuration of the OLT110 may vary depending on the specific type of ODN 100. As shown in fig. 4, the OLT110 may include a downstream interface 1101, a coupler (coupler)1102, a downstream optical signal transmitter 1103, an upstream optical signal receiver 1104, a storage module 1105, a processing module 1106, and a MAC module 1107.

The downstream interface 1101 may be an optical fiber adapter, and serves as an interface connected to the ODN130 to transmit or receive uplink/downlink optical signals. The coupler 1102 is arranged in a main optical path along the extension of the downstream interface 1101 and at an angle to said main optical path. The coupler 1102 may couple at least a portion of a downstream optical signal transmitted by the downstream optical signal transmitter 1103 to the downstream interface 1101 and couple at least a portion of an upstream optical signal input from the downstream interface 1101 to the upstream optical signal receiver 1104. The wavelength of the downlink optical signal is λ 1. The wavelength of the uplink optical signal received by the OLT110 is λ 2, and the uplink optical signal is an uplink service optical signal, that is, an optical signal that is transmitted by the ONU120 to the OLT110 in a time slot allocated by the OLT110 and is used for transmitting data. The uplink optical signal may be a second uplink optical signal, a third uplink optical signal, which will be mentioned later.

The downstream optical signal transmitter 1103 may transmit the downstream optical signal provided by the MAC module 1107 through the downstream optical signal transmitter 1103 to the ONU120 through the coupler 1102, the downstream interface 1101, and the ODN 130. The downlink optical signal may include a first downlink optical signal, a second downlink optical signal, a third downlink optical signal, and the like. The uplink optical signal receiver 1104 may receive an uplink optical signal sent by the ONU120 through the ODN130, convert the uplink optical signal into an uplink electrical signal, and provide the uplink electrical signal to the MAC module 1107 for data analysis and processing.

As an optional manner, the uplink optical signal may include strength information of an echo optical signal generated at the ODN130 for an uplink test optical signal (which may also be referred to as a first uplink optical signal) sent by the ONU120 through the ODN 130. The storage module 1105 may store the correspondence between the strength information of the echo optical signal and the information of the first port, where the first port refers to a port of the last optical splitter to which the ONU120 is connected. The processing module 1106 may determine to transmit the information of the first port of the ONU120 according to the strength information of the echo optical signal transmitted by the ONU120 and the correspondence between the strength information of the echo optical signal and the information of the first port. The storage module 1105 may further store a corresponding relationship between the strength information of the echo optical signal and information of a second port, where the second port is a port of a previous-stage optical splitter connected to a last-stage optical splitter connected to the ONU 120. The processing module 1106 may further determine the information of the second port of the ONU120 according to the strength information of the echo optical signal sent by the ONU 120. The processing module 1106 may further determine the connection relationship between the ONU120 and the ODN130 according to the information of the first port and the information of the second port. Or the storage module 1105 may further store the topology structure of the ODN130, the processing module 1106 may determine the connection relationship between the ONU120 and the ODN130 according to the information of the first port and the topology structure of the ODN 130. In addition, the storage module 1105 may also store the determined information of the first port and the second port of the ONU120, or the connection relationship with the ODN 130. Reference may be made in particular to the description of the embodiment shown in fig. 7-12.

As an optional manner, the uplink optical signal may include information of the first port and information of the second port of the ONU120, which are reported by the ONU120, or a connection relationship between the ONU120 and the ODN130, and the like. The storage module 1105 may store the information reported by the ONU 120. Reference may be made in particular to the description of the embodiment shown in fig. 7-12.

The downlink optical signal transmitter 1103 may be a Laser Diode (LD) for transmitting a downlink optical signal (hereinafter, referred to as a downlink optical signal λ 1) having a first wavelength λ 1; the uplink optical signal receiver 1104 may be a Photo Diode (PD), such as an Avalanche Photo Diode (APD), and is configured to receive an uplink service optical signal (hereinafter, referred to as an uplink service optical signal λ 2) having a second wavelength λ 2.

In one embodiment, the coupler 1102 may be a Thin Film Filter (TFF) that may transmit the downlink optical signal λ 1 by about 100% and reflect the uplink traffic optical signal λ 2 by about 100%.

In one embodiment, the OLT110 may further comprise a communication interface for communicating with the network management device 140. The communication interface may use any transceiver or the like for communicating with the network management device 140 through a communication network, such as ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc.

Fig. 5A is a schematic structural diagram of an ONU120-1 provided in the embodiment of the present application. As shown in fig. 5A, ONU120-1 may comprise an upstream interface 1201, a first coupler 1202, a second coupler 1203, an echo optical signal receiver 1204, an upstream optical signal transmitter 1205, a downstream optical signal receiver 1206, a storage module 1207, a processing module 1208, and a MAC module 1209.

The uplink interface 1201 may be an optical fiber adapter, and serves as an interface connected to the ODN130 to transmit or receive uplink/downlink optical signals. The transmission optical paths of the first coupler 1202 and the second coupler 1203 overlap. The upstream optical signal transmitter 1205 is coupled to the transmission optical path of the second coupler 1203. The echo optical signal receiver 1204 is coupled to the reflected optical path of the second coupler 1203. The downstream optical signal receiver 1206 is coupled to the reflected optical path of the first coupler 1202.

The upstream interface 1201 transmits an upstream traffic optical signal (upstream traffic optical signal λ 2) having a second wavelength λ 2 or an upstream test optical signal (upstream test optical signal λ 2, which may also be referred to as a first upstream optical signal) having a second wavelength λ 2 to the OLT110, and receives a downstream optical signal (downstream optical signal λ 1) having a first wavelength λ 1 or receives an echo optical signal (hereinafter referred to as echo optical signal λ 2) having an upstream test optical signal λ 2 having a second wavelength λ 2. The first coupler 1202, which may be a TFF, reflects the downlink optical signal λ 1 transmitted by the OLT110 to couple the downlink optical signal λ 1 to the downlink optical signal receiver 1206 and transmits the echo optical signal λ 2 to the second coupler 1203. The second coupler 1203, which may be a ring type coupler, couples the echo optical signal λ 2 to the echo optical signal receiver 1204. The first coupler 1202 and the second coupler 1203 may also transmit the uplink optical signal (including the uplink traffic optical signal λ 2 and/or the uplink test optical signal λ 2) transmitted by the uplink optical signal transmitter 1205 to the uplink interface 1201.

The upstream service optical signal is an optical signal that is sent by the ONU120 to the OLT110 and used for transmitting data, for example, an upstream optical signal used for reporting strength information of an echo optical signal to the OLT110, or a third upstream optical signal used for reporting information of a first port of a last-stage optical splitter port connected to the ONU120 to the OLT110, or a connection relationship between the ONU120 and an optical fiber network; and the upstream test optical signal is an optical signal for testing sent by the ONU120, for example, a first upstream optical signal. It should be understood that the upstream traffic optical signal may also be used as an upstream test optical signal, such as an upstream optical signal used for both transmitting data to the OLT110 and measuring the ODN 130. Thus, the upstream test optical signal may be an upstream traffic optical signal including normal communication data, or a specific upstream optical signal including specific data (e.g., "0101 …" or all "1" or any encoded information).

The downlink optical signal receiver 1206 is configured to receive the downlink optical signal λ 1 through the first coupler 1202 and convert the downlink optical signal λ 1 into a downlink electrical signal. The first wavelength λ 1 may be 1490nm, 1577nm, or the like. The uplink optical signal transmitter 1205 is configured to transmit the uplink traffic optical signal λ 2 and/or the uplink test optical signal λ 2 through the second coupler 1203 and the first coupler 1202 and via the uplink interface 1201. Specifically, the uplink optical signal transmitter 1205 may transmit the uplink test optical signal λ 2 according to the indication information and/or the time information of transmitting the uplink test optical signal in the downlink electrical signal analyzed by the MAC module 1209, or the uplink optical signal transmitter 1205 may transmit the uplink test optical signal λ 2 according to the indication information and/or the time information transmitted by the processing module. The wavelength of the uplink traffic optical signal λ 2 is the same as that of the uplink test optical signal λ 2, and λ 2 may be 1310nm or 1290 nm.

The echo optical signal receiver 1204 is configured to receive an echo optical signal λ 2 generated by the uplink test optical signal λ 2 in the optical fiber network, and convert the echo optical signal λ 2 into an echo electrical signal. The wavelength λ 2 of the echo optical signal is the same as the wavelength λ 2 of the upstream test optical signal. The processing module 1208 is configured to obtain intensity information of an echo optical signal of the uplink test optical signal received by the echo optical signal receiver 1204. Specifically, the processing module 1208 may obtain the intensity information of the echo optical signal according to the test parameter in the downlink electrical signal analyzed by the MAC module 1209. The storage module 1207 is configured to store the test parameter and the intensity information of the echo optical signal.

The MAC module 1209 may be configured to parse the downlink electrical signal (e.g., the first downlink electrical signal converted from the first downlink optical signal) to obtain indication information and/or time information for transmitting the uplink test optical signal, and provide the indication information and/or the time information to the processing module 1208 or the uplink optical signal transmitter 1205. The MAC module 1209 may be further configured to parse the downlink electrical signal (e.g., a second downlink electrical signal obtained by converting the second downlink optical signal) to obtain a test parameter, and provide the test parameter to the processing module 1208.

As an optional manner, the uplink optical signal transmitter 1205 may further report the intensity information of the echo optical signal λ 2 acquired by the processing module 1208 to the OLT110 through the ODN 130. The intensity information of the echo optical signal λ 2 may be obtained by the processing module 1208 by measuring the echo optical signal λ 2, or may be sent to the ONU120-2 after the measuring device measures the echo optical signal λ 2.

As an optional manner, the storage module 1207 may further store a corresponding relationship between the intensity information of the echo optical signal and the information of the first port, and the processing module 1208 may further determine the information of the first port of the ONU120-1 according to the intensity information of the echo optical signal obtained by the processing module; the processing module 1208 may further determine information of the second port of the ONU120-1, a connection relationship between the ONU120-1 and the ODN130, and the like. The uplink optical signal transmitter 1205 may also report the determined information of the first port and the second port of the ONU120-1, or the connection relationship between the ONU120-1 and the ODN130 to the OLT110 through the ODN 130. For details, reference may be made to the description of the embodiments shown in fig. 7-12.

In the embodiment corresponding to fig. 5A, the wavelength of the uplink test optical signal is the same as the wavelength of the uplink service optical signal.

Fig. 5B is a schematic structural diagram of another ONU120-2 according to the embodiment of the present disclosure. Fig. 5B provides ONU120-2 comprising upstream interface 1201, first coupler 1202, downstream optical signal receiver 1206, storage module 1207, processing module 1208, and MAC module 1209. Unlike the structure of the ONU120-1 provided in fig. 5A, the ONU120-2 includes a third coupler 1211, a fourth coupler 1212, an echo optical signal receiver 1213, and an upstream optical signal transmitter. The uplink optical signal transmitter includes an uplink test optical signal transmitter 1214 (which may also be referred to as a first uplink optical signal transmitter) and an uplink traffic optical signal transmitter 1215 (which may also be referred to as a second uplink optical signal transmitter). It should be understood that the uplink test optical signal transmitter 1214 and the uplink traffic optical signal transmitter 1215 may be two separate transmitters, or may be one transmitter that is used to transmit both the uplink test optical signal λ 3 and the uplink test optical signal λ 2.

The uplink interface 1201 may be an optical fiber adapter, and serves as an interface connected to the ODN130 to transmit or receive uplink/downlink optical signals. The transmission optical paths of the first coupler 1202 and the third coupler 1211 overlap. An upstream traffic optical signal transmitter 1215 is coupled to the transmitted optical path of the first coupler 1202. The downstream optical signal receiver 1206 is coupled to the reflected optical path of the first coupler 1202. The transmission optical path of the third coupler 1211 overlaps with the reflection optical path of the fourth coupler 1212. Upstream test optical signal transmitter 1214 is coupled to the reflected optical path of fourth coupler 1212. The echo optical signal receiver 1213 is coupled to the transmission optical path of the fourth coupler 1212.

The uplink interface 1201 and the first coupler 1202 have the same function as in fig. 5A, and the embodiment of the present application is not described in detail herein. The first coupler 1202 is configured to transmit an uplink traffic optical signal having a second wavelength λ 2 (referred to as an uplink traffic optical signal λ 2 for short) and reflect a downlink optical signal having a first wavelength λ 1 (referred to as a downlink optical signal λ 1 for short). The third coupler 1211 is configured to transmit an uplink test optical signal having a third wavelength λ 3 (referred to as the uplink test optical signal λ 3, which may also be referred to as the first uplink optical signal) and reflect an echo optical signal of the received uplink test optical signal λ 3 (referred to as the echo optical signal λ 3), so that the third wavelength test signal having the same wavelength or wavelength band is transmitted in two directions. The third coupler 1211 is also configured to transmit the downstream optical signal λ 1 and transmit the upstream traffic optical signal λ 2. The fourth coupler 1212 is used to reflect the upstream test optical signal λ 3 and transmit the return optical signal λ 3.

It should be understood that multiple couplers in the ONU120-2 may be combined into other optical paths, and the following conditions may be satisfied: the downlink optical signal receiver 1206 receives the downlink optical signal λ 1 sent by the uplink interface 1201, the uplink service optical signal transmitter 1215 sends the uplink service optical signal λ 2 through the uplink interface 1201, the uplink test optical signal transmitter 1214 sends the uplink test optical signal λ 3 through the uplink interface 1201, and the echo optical signal receiver 1213 receives the echo optical signal λ 3 sent by the uplink interface 1201.

The downlink optical signal receiver 1206 is configured to receive the downlink optical signal λ 1 through the first coupler 1202 and the fourth coupler 1211, and convert the downlink optical signal λ 1 into a corresponding downlink electrical signal. λ 1 may be 1490nm, 1577nm, etc. The upstream service optical signal transmitter 1215 is configured to transmit an upstream service optical signal λ 2 to the OLT110 through the upstream interface 1201 via the first coupler 1202 and the fourth coupler 1211. λ 2 can be 1310nm or 1290nm, etc. The echo optical signal receiver 1213 is configured to receive an echo optical signal λ 3 generated by the upstream test optical signal λ 3 through the ODN 130. λ 3 may be 1650nm or 1625 nm. The upstream test optical signal transmitter 1214 is configured to transmit an upstream test optical signal λ 3 to the OLT110 (or the ODN130) through the ODN 130. The processing module 1208 is configured to control the uplink test optical signal transmitter 1214 to transmit the uplink test optical signal λ 3 or control the echo optical signal receiver 1211 to receive the echo optical signal λ 3 according to data (such as indication information) in the downlink electrical signal analyzed by the MAC module 1209. The processing module 1208 may also be configured to obtain intensity information of the received optical signal λ 3. Specifically, the processing module 1208 may obtain the intensity information of the echo optical signal λ 3 according to the test parameter in the downlink electrical signal analyzed by the MAC module 1209. The storage module 1207 is configured to store the test parameter and the acquired intensity information of the echo optical signal λ 3. The MAC module 1209 is configured to analyze the converted electrical signal to obtain data information and provide the data information to the processing module 1208, or the uplink test optical signal transmitter 1214, or the like.

As an optional manner, the uplink service optical signal transmitter 1215 may further report, to the OLT110, the strength information of the echo optical signal λ 3 stored in the storage module 1207 through the ODN 130.

As an optional manner, the storage module 1207 may store the correspondence relationship between the intensity information of the echo optical signal and the information of the first port, and/or the correspondence relationship between the intensity information of the echo optical signal and the information of the second port, and/or the topology structure of the ODN 130. The processing module 1208 may further determine, according to the strength information of the echo optical signal obtained by itself, information of the first port and/or information of the second port of the ONU120-1, and/or a connection relationship with the ODN130, and the like. The uplink optical signal transmitter 1215 may also report the determined information of the first port and the second port of the ONU120-1, or the connection relationship between the ONU120-1 and the ODN130 to the OLT110 through the ODN 130. For details, reference may be made to the description of the embodiments shown in fig. 7-12.

In the embodiment corresponding to fig. 5B, the wavelength of the uplink test optical signal λ 3 is different from the wavelength of the uplink traffic signal λ 2.

It should be noted that, in fig. 5A and 5B, the ONU120 may acquire the intensity signal of the echo optical signal by acquiring intensity information of the echo optical signal measured by the ONU120 itself, or acquiring the intensity information of the echo optical signal according to the result of the echo optical signal measured by the OTDR.

Fig. 6A is a schematic structural diagram of a reflector 600-1 according to an embodiment of the present disclosure. The reflector 600-1 is applied to the beam splitter 300-1 or the beam splitter 300-2, for example, a first reflector, a second reflector, or a third reflector. Reflector 600-1 may include a beam splitter 601, a first branch 602, a second branch 603, and a third branch 604.

The optical splitter 601 may be a planar optical waveguide power splitter, a thin film filter, or a fused tapered optical splitter. First branch 602, second branch 603, and third branch 604 may be branches internal to ports of optical splitter 300-1 or optical splitter 300-2; or may be a branch coupled to a port of the optical splitter 300-1 or the optical splitter 300-2. The branch may be a waveguide or an optical fiber. In addition, the third branch 604 may be suspended, or may be configured to include a reflective surface 605, for example, by forming the reflective surface 605 on the third branch 604 by etching a grating, plating, or the like.

The optical splitter 601 may split the uplink optical signal input from the first branch 602, and most of the uplink optical signal is output from the second branch 603, passes through the interior of the optical splitter 300-1 or 300-2, and further passes through the first side port a of the optical splitter 300-1 or 300-2₁And (6) outputting. Another part of the uplink optical signals is transmitted from the third branch 604, and when the other part of the uplink optical signals is transmitted to the reflecting surface 605 or the suspension point of the third branch 604, at least a part of the other part of the uplink optical signals is reflected, and then the other part of the uplink optical signals is transmitted out from the first branch 602 after passing through the optical splitter 601 to form echo optical signals of the uplink optical signals. The uplink optical signal may specifically be an uplink test optical signal or an uplink service optical signal. It should be understood that the echo optical signal also includes other reflected or scattered signals, which are negligible here.

The second branch 603 receives the downstream optical signal transmitted from the inside of the optical splitter 300-1 or 300-2. After the downlink optical signal passes through the optical splitter 601, at least a part of the optical signal is output from the first branch 602.

Reflectivity R of reflector 600-1_efCan be expressed in the following formula:

wherein R is_aIs the reflectivity of the reflective surface 605 or the reflectivity of the suspended third branch 604; the ratio of the split power of the first branch 602 of the splitter 601 is 1: S_a. When the uplink optical signal is inputted from the first branch 602 and split by the optical splitter 601, the seventh optical signal transmitted to the third branch 604 is 1/S of the uplink optical signal_a(ii) a The eighth part of the optical signal formed by the seventh part of the optical signal being reflected by the reflection surface 605 or the floating point of the third branch 604 is R of the uplink optical signal_a/S_aA ninth optical signal formed after the eighth optical signal passes through the optical splitter 601 is R of the uplink optical signal_a/(S_a×S_a) Thus, equation (1) is obtained. ReflectionRate R_efOther representations are possible and this application is not limited.

In the present application, when the reflector 600-1 is applied to the beam splitter 300-1 or 300-2, the reflectivity R of the reflector 600-1_efThere is a corresponding relationship with the port information of the port where the reflector 600-1 is located, and specific reference may be made to the description of fig. 3A and 3B. As can be seen from the formula (1), R can be adjusted_aAnd/or S_aTo the reflectance R_efIs adjusted so that the reflectivity R of the reflector 600-1 is_efThe correspondence with the port information described in fig. 3A, 3B is satisfied.

Fig. 6B is a schematic structural diagram of a reflector 600-2 according to an embodiment of the present disclosure. The reflector 600-2 is applied to the beam splitter 300-1 or the beam splitter 300-2, for example, a first reflector, a second reflector, or a third reflector. Wherein, FIG. 6B is a cross-sectional view of the reflector 600-2.

Alternatively, reflector 600-2 may be formed at a port of splitter 300-1 or splitter 300-2 by etching or photolithography. For example, a groove 607 is formed by etching or photolithography on the branch 605 inside the port of the optical splitter 300-1 or the optical splitter 300-2, or a groove 607 is formed by etching or photolithography on the branch 605 connected to the port of the optical splitter 300-1 or the optical splitter 300-2. The branch 605 may specifically be a waveguide or an optical fiber or the like, comprising a core layer 606 and a cladding layer 608. The grooves 607 and the core 606 have a refractive index difference so that when an optical signal passes through the branches 605, a part of the optical signal is reflected. The reflectivity of the reflector 600-2 is related to the number, size and refractive index of the grooves 607.

Optionally, the reflectivity of the reflector 600-2 can be controlled by adjusting the number of the grooves 607 in the reflector 600-2 (e.g., the size of B in the figure) and the size of the grooves 607 (e.g., the length, width, or height of the grooves), so that the reflectivity of the reflector 600-2 corresponds to the port information of the port where the reflector 600-2 is located, which can be specifically referred to the description of fig. 3A and 3B.

Optionally, the grooves 607 may be filled with a material having a refractive index different from that of the core layer waveguide 606, so that the reflectivity of the reflector 600-2 may be controlled by adjusting the number of the grooves 607 and the size of the grooves 607, and the reflectivity of the reflector 600-2 may be controlled by setting the refractive index of the filling material.

Alternatively, the reflectivity of the reflector 600-2 is controlled by adjusting the refractive index of the core 606, for example, by setting the refractive index of the core waveguide 606 to be periodically or sectionally varied. In this case, the groove 607 may be provided at the same time, or the groove 607 may not be provided.

Fig. 7 is a diagram of a method for identifying an ONU connection port according to an embodiment of the present disclosure, which is applied to a passive optical network system or an active optical network system. With reference to fig. 1 to fig. 6B, a method provided in an embodiment of the present application includes:

step 701, the OLT110 instructs the ONUi 120 to send an uplink test optical signal through the first downlink optical signal.

The first downlink optical signal may carry indication information indicating that the ONUi 120 sends an uplink test optical signal, and/or time information indicating that the ONUi 120 sends the uplink test optical signal. For convenience of description, in the embodiment of the present application, the ONUi 120 that sends the uplink test optical signal is referred to as a first ONU 120.

The OLT110 may select (e.g., randomly select or otherwise select) an ONU that has not sent the upstream test optical signal as the first ONU 120. For example, the OLT110 identifies ONUs that have transmitted the upstream test optical signal, and determines the first ONU120 that transmits the upstream test optical signal next time from among ONUs that have not transmitted the upstream test optical signal. The first ONU120 may also be the ONU120 connected to the ODN130 for the first time, for example, before step 701, the first ONU120 sends a registration request to the OLT110 through an upstream optical signal, and the OLT110 determines that the first ONU120 is the ONU120 accessed for the first time according to the registration request. As an alternative, before step 701, the first ONU120 requests the OLT110 to authorize the testing of the port connection by an upstream optical signal. For example, the first ONU120 sends the second upstream optical signal to the OLT110 to request the OLT110 to authorize the first ONU120 to send the upstream test optical signal, which specifically includes requesting the OLT110 to allocate a test time, such as time information for sending the upstream test optical signal.

The indication information may include an identification of the first ONU120, such as a MAC address of the first ONU120, an ONU ID assigned by the OLT110 to the first ONU120, and the like. The indication information may further include that a control bit for identifying whether to send the uplink test optical signal is a preset value, for example, the control bit is 1, which indicates to send the uplink test optical signal.

The time information for transmitting the uplink test optical signal may include a start time for transmitting the uplink test optical signal, an end time for transmitting the uplink test optical signal, or a duration for transmitting the uplink test optical signal.

In step 702, the OLT110 instructs the first ONU120 to obtain the intensity information of the echo signal of the upstream test optical signal through the second downstream optical signal.

The second downlink optical signal carries indication information indicating that the first ONU120 acquires the intensity information of the echo optical signal, and/or time information indicating that the first ONU120 acquires the intensity information of the echo optical signal. The obtaining of the intensity information of the echo optical signal by the first ONU120 may specifically refer to the first ONU120 measuring the received echo optical signal to obtain the intensity information of the echo optical signal, or refer to the first ONU120 receiving the intensity information of the echo optical signal sent by the testing equipment connected to the first ONU 120. The testing device is used to connect to the ONU120 and obtain the strength information of the echo optical signal received by the ONU120, and may specifically be an OTDR device, an optical power meter, or other devices. Test equipment

The time information for acquiring the strength information of the echo optical signal may indicate a time when the first ONU120 starts to measure the echo optical signal (for example, a time delay relative to a time when the first ONU120 receives the second downlink optical signal), or may indicate a time when a testing device corresponding to the first ONU120 starts to measure the echo optical signal. For example, before step 701, the OLT110 may obtain a Round Trip Time (RTT) or an equivalent Delay (Eqd) of the first ONU120, and determine that the first ONU120 measures the Delay of the echo optical signal according to the RTT and/or Eqd of the first ONU 120. The time delay may refer to: the time difference of the echo optical signal is measured from the time the first ONU120 starts sending the upstream test optical signal to the time the first ONU starts measuring the echo optical signal. The method for the OLT110 to obtain the RTT and/or the RTT Eqd of the first ONU120 may refer to the prior art (e.g. ITU-T g.984.3), and the embodiments of the present application are not described in detail herein.

Further, the time information for obtaining the intensity information of the echo optical signal may also indicate a time duration for measuring the echo optical signal of the first ONU120, which may be referred to as a measurement time duration for short. The measurement duration indicates a time length or a data amount of the first ONU120 or a test device corresponding to the first ONU120 to measure the echo optical signal. The time length refers to a duration, such as 3 seconds, for which the first ONU120 or the testing device continuously tests the echo optical signal. The data amount refers to the number of times of measuring the echo optical signal, such as once in the first second of starting the test, once in the second, and the like.

Further, the second downlink optical signal may also carry the type of the obtained intensity information of the echo optical signal, such as the power of the echo optical signal, the reflection curve of the echo optical signal, and the like.

The time information, the type, or the like of the acquired intensity information of the echo optical signal may be referred to as a test parameter.

It should be understood that step 702 and step 701 are not limited to being chronological. The second downlink optical signal and the first downlink optical signal may be the same optical signal, that is, step 702 and step 701 are executed simultaneously.

Step 703, the first ONU120 sends the upstream test optical signal according to the instruction of the OLT 110.

If the first downlink optical signal includes time information for sending the uplink test optical signal, the first ONU120 starts sending the uplink test optical signal when determining that the time for sending the uplink test optical signal reaches. Further, the first ONU120 may transmit the uplink test optical signal according to an end time, a duration, or the like of transmitting the uplink test optical signal carried in the first downlink optical signal. The method of transmitting the uplink test optical signal may be configured in the first downlink optical signal, for example, transmitting a short pulse once or a plurality of times, or transmitting a long pulse, and the pulse width may be configured in the first downlink optical signal. The intensity of the uplink test optical signal may be the intensity of the first downlink optical signal, for example, the average optical power of the uplink test optical signal may be 0 dBm.

It should be understood that if the first downlink optical signal does not include the time information, the manner of sending the uplink test optical signal, or the intensity of the uplink test optical signal, the first ONU120 may send the uplink test optical signal at a preset time, manner, or intensity. For example, the first ONU120 starts transmitting the upstream test optical signal immediately after receiving the first downstream optical signal.

The wavelength of the uplink test optical signal may be the same as or different from the wavelength of the uplink service optical signal.

Step 704, the first ONU120 obtains the intensity information of the echo optical signal of the upstream test optical signal according to the instruction of the OLT 110.

If the second downlink optical signal includes time information for acquiring the intensity information of the echo optical signal, the first ONU120 or the test device corresponding to the first ONU120 measures the echo optical signal according to the time information.

If the second downlink optical signal includes the type of the obtained intensity information of the echo optical signal, the first ONU120 or the test device corresponding to the first ONU120 measures the echo optical signal according to the type to obtain measurement data of a corresponding type.

It should be understood that if the first downlink optical signal does not include the time information, the first ONU120 or the testing device corresponding to the first ONU120 may measure the echo optical signal at a preset time. The first ONU120 or the testing device corresponding to the first ONU120 may start measuring the echo optical signal immediately after receiving the echo optical signal. The same is true with respect to the type of intensity information of the acquired echo light signal, for example, measurement and data collection according to a preset reflection curve.

Step 705, the OLT110 instructs the first ONU120 to report the acquired measurement result through the fourth downlink optical signal.

The fourth downlink optical signal may carry indication information indicating that the first ONU120 reports the intensity information of the echo optical signal, and/or time information indicating that the first ONU120 reports the intensity information of the echo optical signal.

It is understood that step 702 and step 705 may be performed simultaneously. Wherein the second downlink optical signal and the fourth downlink optical signal may be the same optical signal. If step 701, step 702, and step 705 can be executed simultaneously, the first downlink optical signal, the second downlink optical signal, and the fourth downlink optical signal may be the same optical signal.

Step 706, the first ONU120 reports the measurement result to the OLT 110.

The measurement result may be intensity information of the echo optical signal acquired by the first ONU 120. As an alternative, the strength information of the echo optical signal acquired by the first ONU120 may include a reflection curve of the echo optical signal. It should be understood that the reflection curve reported by the first ONU120 may be continuous or discrete. The first ONU120 may report the obtained entire reflection curve; the curve segment where the event (reflection event, attenuation event, etc.) is located may also be reported, for example, the height of the reflection peak and the distance of the reflection peak corresponding to the reflection event, and the attenuation value and the distance corresponding to the attenuation event. As an optional manner, the intensity information of the echo optical signal acquired by the first ONU120 may further include information such as an average optical power of the echo optical signal.

The measurements may also carry a combination of one or more of the following: the identifier of the first ONU120, the first ONU120 or the OTDR corresponding to the first ONU120 measure the time information of the echo optical signal, the intensity of the uplink test optical signal sent by the first ONU120, the sending mode, the pulse width, or the time information for reporting the measurement result, and the like.

Step 707, the OLT110 determines the information of the first port of the first ONU120 according to the intensity information of the echo optical signal reported by the first ONU 120. The first port of the first ONU120 is a port of a final optical splitter to which the first ONU120 is connected.

Since the intensity information of the echo optical signal corresponds to the information of the first port of the first ONU120, the OLT110 can determine the information of the first port of the first ONU120 according to the intensity information of the echo optical signal and the correspondence between the intensity information of the echo optical signal and the information of the first port of the first ONU 120.

The echo optical signal includes a first part of the upstream test optical signal reflected by a reflector disposed at the first port of the first ONU 120. The correspondence between the intensity information of the echo optical signal and the information of the first port is based on the correspondence between the reflectivity of the reflector and the information of the first port. The final splitter may be configured as splitter 300-1 or splitter 300-2, so that the information of the port of the final splitter corresponds to the reflectivity of the reflector at the port, as described in the embodiment of fig. 3A or fig. 3B. It should be understood that the reflector may be a first reflector, and the first portion of the optical signal is reflected by the first reflector; the reflector here may also be a second reflector and/or a third reflector, and the first part of the optical signal is reflected by the second reflector and/or the third reflector.

The intensity information of the echo optical signal reported by the first ONU120 corresponds to the reflectivity of the first port of the first ONU 120. The greater the reflectivity of the first port, the greater the intensity of the return optical signal. And the reflectivity of the first port may be considered to be the reflectivity of the reflector provided by the first port. Reflections from mechanical connections (e.g., fiber splices) and the like are ignored here. And then according to the corresponding relationship between the intensity information of the echo optical signal and the reflectivity of the reflector arranged at the first port and the corresponding relationship between the reflectivity of the reflector and the information of the first port where the reflector is located, the corresponding relationship between the intensity information of the echo optical signal and the information of the first port can be determined.

Taking the structure of the final optical splitter using the optical splitter 300-1 as an example, the second side port of the final optical splitter is provided with a first reflector. The intensity information of the echo optical signal reported by the first ONU120 corresponds to the reflectivity of the first reflector disposed at the second side port (i.e., the first port) of the last optical splitter connected to the first ONU 120. As can be seen from the embodiment shown in fig. 3A, the reflectivity of the first reflector corresponds to the information of the first port where the first reflector is located. Therefore, the strength information of the echo optical signal corresponds to the information of the first port of the first ONU 120.

Specifically, the correspondence between the information of the first port and the intensity information of the echo optical signal may be obtained by further deriving an empirical calculation formula and a theoretical calculation formula based on the correspondence between the reflectivity of the reflector and the information of the first port. Or the corresponding relation between the information of the first port and the intensity information of the echo optical signal can be obtained through testing.

For example, during the construction of the ODN130 (e.g., the establishment of a fiber link), a worker may record the topology of the ODN (e.g., the connection relationship between optical splitters, port information of the optical splitters, etc.). Further, the staff may also test the ODN130, for example, connect an ONU120 or a test device to a port with known port information, so that the ONU120 or the test device sends an upstream test optical signal, receives an echo optical signal, and acquires intensity information of the echo optical signal. The strength information of the echo optical signal and the information of the ports to which the ONUs 120 or the test equipment are connected may be stored in the OLT110, the network management server 140, the ONUs 120, and the like. It should be understood that, in this case, the correspondence between the information of the first port and the intensity information of the echo optical signal is also based on the correspondence between the reflectivity of the reflector and the information of the first port. As an alternative, the OLT110 stores the correspondence between the information of the different ports of the final optical splitter and the intensity information of the echo optical signal. The OLT110 may determine information of the first port of the corresponding first ONU120 according to the intensity information of the echo optical signal reported by the first ONU 120.

As an example, the intensity information of the echo light signal comprises information of events in a reflection curve. The intensity information of the echo optical signal reported by the first ONU120 includes a height of a first reflection peak in a reflection curve of the echo optical signal, where the first reflection peak is a reflection peak formed by the uplink test optical signal sent by the first ONU120 and transmitted to a first port of a last optical splitter connected to the first ONU120, and is formed by a first part of the uplink test optical signal reflected by a reflector arranged at the first port. The correspondence between the height of the first reflection peak and the information of the first port is thus based on the correspondence between the reflectivity of the reflector and the information of the first port. The height of the first reflection peak is indicative of the intensity of the first portion of the light signal; the distance of the first reflection peak indicates the distance between the first ONU120 and a reflector provided at the first port. In other words, the distance of the first reflection peak indicates the distance that the first part of the optical signal is transmitted from the reflector provided at the first port to the first ONU 120. It should be understood that the distance of the first reflection peak also indicates the distance that the upstream test optical signal is transmitted from the first ONU120 to the reflector provided at the first port.

When a plurality of reflection peaks are included in the intensity information of the echo optical signal, which is the first reflection peak can be determined by the distance of the reflection peaks. And because the upstream test optical signal passes through the final-stage optical splitter to form an attenuation event, and the attenuation event caused by the final-stage optical splitter is very close to the first reflection peak caused by the reflector arranged at the port of the final-stage optical splitter, it can also be determined which is the first reflection peak based on the reflection peak closest to the attenuation event of the final-stage optical splitter, or determined based on that the difference between the distance of the first reflection peak and the distance of the attenuation event of the final-stage optical splitter is less than a certain distance threshold.

The OLT110 stores information of different ports of the final splitter and a correspondence of the height of the first reflection peak in the reflection curve. The OLT110 determines the information of the first port of the first ONU110 according to the height of the first reflection peak and the corresponding relationship between the height of the first reflection peak and the information of the first port.

As an alternative, the OLT110 stores the correspondence between the information of different ports of the final optical splitter and the reflectivity of the upstream test optical signal transmitted from the ports. The OLT110 may determine the reflectivity of the upstream test optical signal according to the intensity information of the echo optical signal reported by the first ONU120 and the intensity of the upstream test optical signal sent by the first ONU120 (for example, the reflectivity is a ratio of the optical power of the echo optical signal to the optical power of the upstream test optical signal), and further determine the information of the first port of the corresponding first ONU120 according to the reflectivity of the upstream test optical signal.

As an alternative, the OLT110 stores information about the different ports of the final splitter and the reflectivity of the reflectors at said ports. The OLT110 may determine reflectivity of an echo optical signal received by the first ONU120 relative to an upstream test optical signal sent by the first ONU120, and then determine reflectivity of a reflector of the first port of the first ONU120 according to the reflectivity of the upstream test optical signal (for example, the reflectivity is determined according to an empirical calculation formula), and then determine information of the corresponding first port of the first ONU120 according to the reflectivity of the reflector of the first port.

It should be understood that, in the above-mentioned various alternatives, the intensity information of the echo optical signal reported by the first ONU120 and the information of the first port of the first ONU120 all have a corresponding relationship, and the difference is how the OLT110 determines the port information by using the corresponding relationship.

In step 708, the OLT110 may further determine the connection relationship between the first ONU120 and the optical network.

The connection relationship between the first ONU120 and the optical fiber network refers to a connection condition of the first ONU120 and each optical splitter in the ODN130, and may specifically include which port of the last optical splitter the first ONU120 is connected to, which port of the last optical splitter is connected to, or which optical fiber link in the ODN130 the first ONU120 is connected to.

In step 707, the OLT110 determines information of the first port of the first ONU 120. Optionally, the OLT110 may further determine the connection relationship between the first ONU120 and the ODN130 by combining with the topology structure of the ODN 130. The OLT110 may store the topology of the ODN130, for example, during the construction of the ODN130, a worker may record the connection relationship of each optical splitter in the ODN130 and upload the connection relationship to the OLT110, or after the construction of the ODN130 is completed, test the ODN130 to obtain the topology of the ODN 130. It should be appreciated that step 707 has determined the connection relationship of the first ONU120 when the ODN130 includes only one stage of splitter, i.e., the final stage splitter.

In addition, the OLT110 may further determine, according to the intensity information of the echo optical signal reported by the first ONU120, information of a second port of a previous-stage optical splitter connected to the last-stage optical splitter connected to the first ONU120, so as to obtain the connection relationship of the first ONU 120. The method for determining the information of the second port by the OLT110 is similar to the method for determining the information of the first port in step 707 and will not be described in detail here.

Further explanation will be made based on the example in step 707. The intensity information of the echo optical signal reported by the first ONU120 further includes a height of a second reflection peak in a reflection curve of the echo optical signal, where the second reflection peak is a reflection peak formed by the uplink test optical signal sent by the first ONU120 and transmitted to the second port of the first ONU120, and is formed by a second part of the optical signal reflected by a reflector arranged at the second port in the uplink test optical signal. The height of the second reflection peak is indicative of the intensity of the second portion of the light signal; the distance of the second reflection peak indicates the distance between the first ONU120 and a reflector provided at the second port. In other words, the distance of the second reflection peak indicates the distance that the second part of the optical signal is transmitted from the reflector provided at the second port to the first ONU 120. The distance of the second reflection peak also indicates the distance that the upstream test optical signal is transmitted from the first ONU120 to the reflector provided at the second port.

For convenience of description, the splitter of the previous stage to which the final splitter is connected will be referred to as a first splitter (i.e., the ODN130 will be described as including two splitters). At this time, the intensity information of the echo optical signal reported by the first ONU120 at least includes two reflection peaks corresponding to the first reflection peak and the second reflection peak. It is possible to judge which is the second reflection peak by the distance of the second reflection peak being larger than the distance of the first reflection peak. It is also possible to determine which of the second reflection peaks is based on the reflection peak closest to the attenuation event of the first-stage splitter, or based on the difference between the distance of the second reflection peak and the distance of the attenuation event of the first-stage splitter being less than a certain distance threshold. The OLT110 stores port information of different ports of the first-stage optical splitter and heights of reflection peaks corresponding to the ports. The OLT110 determines the information of the second port of the corresponding first ONU120 according to the height of the second reflection peak. Further, the OLT110 determines the connection relationship between the first ONU120 and the ODN130 according to the information of the first port and the information of the second port of the first ONU 120.

It should be noted that, the OLT110 may determine the information of the second port first and then determine the information of the first port, which is not limited in this embodiment of the present application.

It should be appreciated that when the ODN130 employs multi-stage optical splitting (e.g., three-stage optical splitting), the OLT110 may employ a similar method to determine port information for the first ONU connecting each stage of optical splitter. In the embodiment of the present application, the front stage beam splitters of the final stage beam splitter may all adopt the structure of the beam splitter 300-1 or 300-2, or may be beam splitters without a reflector.

Step 709, the OLT110 and the other ONUs 120 repeat steps 701 and 708 to determine the topology of the PON.

The OLT110 determines the identifier of the first ONU120 that transmits the upstream test optical signal next time, and carries the determined identifier of the first ONU120 in the indication information in step 701. The OLT110 may select (e.g., randomly or otherwise select) the ONU120 that has not sent the upstream test optical signal as the first ONU 120. For example, the OLT110 may identify the ONUs 120 that have sent upstream test optical signals. The OLT110 can determine the first ONU120 that transmits the upstream test optical signal next time from among the ONUs 120 that have not transmitted the upstream test optical signal. Then, the OLT110 and the determined first ONU120 repeatedly perform step 701-708 until the topology structure of the PON is determined.

Specifically, the OLT110 may determine to which port of the final-stage optical splitter each ONU120 connected to the ODN130 is connected, i.e., information of the first port of each ONU 120; the OLT110 may further determine information about which port of the previous-stage optical splitter each last-stage optical splitter in the ODN130 is connected to, i.e., the second port of each ONU120, so as to determine a connection relationship between each ONU120 and the ODN130, i.e., determine a topology structure of the PON.

Alternatively, step 707-709 may not be executed first, and steps 709 'and 710' may be executed. That is, 701 and 706 are repeatedly executed, after the OLT110 receives the intensity of the respective echo optical signal sent by each ONU120, the information of the first port and the information of the second port of each ONU120 are determined, so as to determine the topology structure of the PON, and the method for determining may refer to the description in step 707 and 709.

Alternatively, in this case, the OLT110 may configure each ONU120 with a first downlink optical signal in step 701, that is, the first downlink optical signal includes indication information that each ONU120 transmits an uplink test optical signal (for example, an identifier of each ONU120 that transmits the uplink test optical signal, and a time when each ONU120 transmits the uplink test optical signal), indication information that each ONU120 acquires intensity information of the echo optical signal (for example, a time delay, a time length, and/or a number of measurements of the intensity information of the echo optical signal), and the like. See steps 701, 702, 705, etc. for details, which are not described here.

Alternatively, in this case, the OLT110 may determine the ONUs 120 connected to the same last-stage optical splitter, and then determine which port of the previous-stage optical splitter the last-stage optical splitter is connected to according to the strength information of the echo optical signals of the ONUs 120 connected to the same last-stage optical splitter.

The first ONU120 is still taken as an example for explanation. For the sake of reference, in all ONUs 120 managed by the OLT110 in the present application, the ONUs 120 other than the first ONU120 are referred to as second ONUs 120. And the ONU120 connected to the same final-stage optical splitter as the first ONU120 is simply referred to as the third ONU 120. The OLT110 determines the third ONU120 based on the intensity information of the echo optical signal of the second ONU120 and the intensity information of the echo optical signal of the first ONU 120. It should be understood that the echo optical signal of the second ONU120 refers to an echo optical signal generated by the upstream test optical signal sent by the second ONU 120; the echo optical signal of the first ONU120 is an echo optical signal generated by the upstream test optical signal transmitted by the first ONU 120. The OLT110 determines the information of the third ONU120 and the second port of the first ONU120 according to the intensity information of the echo optical signal of the third ONU120 and/or the intensity information of the echo optical signal of the first ONU120

As an example, the intensity information of the echo light signal comprises information of events in the reflection curve. The intensity information of the echo optical signal of the second ONU120 includes the height and distance of the first reflection peak and the height and distance of the second reflection peak, as well as the echo optical signal of the first ONU 120. The difference between the distances of the first reflection peak and the second reflection peak is referred to as a first distance difference, which represents the distance from the reflector of the final-stage optical splitter arrangement to the reflector of the previous-stage optical splitter arrangement of the final-stage optical splitter. The first distance differences of the echo optical signals of the ONUs 120 connected to the same last-stage optical splitter are close, so the OLT110 may determine that the difference between the first distance difference of the echo optical signal of the third ONU120 and the first distance difference of the echo optical signal of the first ONU120 is smaller than the distance threshold. The height of the second reflection peak is related to the reflectivity of the reflector of the previous splitter connected to the last splitter, so that the height of the second reflection peak of the echo optical signal of the ONU120 of the same last splitter is very close, and therefore the OLT110 can determine that the difference between the height of the second reflection peak of the echo optical signal of the third ONU120 and the height of the second reflection peak of the echo optical signal of the first ONU120 is less than the height threshold.

Taking the 2-level ODN130 as an example, fig. 8A is a schematic diagram illustrating reflection curves of echo optical signals of 3 ONUs 120. Taking curve 101 (solid line) as an example, 101-1 is the first reflection peak, and 101-2 is the second reflection peak. Wherein the distance between 101-1 and 101-2 is DeltaL₁₀₁I.e., the first distance difference mentioned above, represents the distance between the second-stage splitter 132 and the first-stage splitter 131 connected to the ONU120 corresponding to the curve 101, i.e., the length of the distribution fiber 134. The curve 102 (dashed line) and the curve 103 (dashed line) are also similar and will not be described again here. Δ L₁₀₁＝6.01km，ΔL₁₀₂＝6km，ΔL₁₀₁And Δ L₁₀₂Very close, i.e. Δ L₁₀₁And Δ L₁₀₂The difference between the two is 0.01km and is less than the distance threshold of 0.1km, so it can be determined that the ONU120 corresponding to the curve 101 and the ONU120 corresponding to the curve 102 are connected to the same second-stage optical splitter 132. And Δ L₁₀₃＝8km，ΔL₁₀₃And Δ L₁₀₁、ΔL₁₀₂The difference between the two is greater than the distance threshold value of 0.1km, so it can be determined that the ONU120 corresponding to the curve 103 and the ONU120 corresponding to the

curves

101 and 102 are not connected to the same second-stage optical splitter 132. In addition, the determination can be made by comparing the heights of the second reflection peaks, which is not described herein again.

Further, the OLT110 determines the information of the second port of the first ONU120 according to the heights of the second reflection peaks of the echo optical signals of the third ONU120 and the first ONU120, and the information of the second port of the third ONU120 is also determined. For example, the OLT110 determines the second port according to an average value of heights of the second reflection peaks of the echo optical signals of the third ONU120 and the first ONU120, and a corresponding relationship between the stored heights of the second reflection peaks and the information of the second port, which may specifically refer to the description of step 708. Or the OLT110 may further remove the maximum value and the minimum value of the heights of the second reflection peaks in the third ONU120 and the first ONU120, and then take the average value, which is not described herein again.

Because the distance from the ONU120 to the reflector arranged in the previous optical splitter connected to the last optical splitter is relatively long, and the transmission distances of the upstream test optical signal and the echo optical signal are both relatively long, the influence of factors such as noise is large, and the error of the height of the second reflection peak is large. Determining the information of the second port according to the strength information of the echo optical signals of the ONUs 120 connected to the same last-stage optical splitter can reduce errors, so that the determined information of the second port is more accurate.

Alternatively, the embodiment of the present application may not perform step 705-.

Step 711, the first ONU120 determines, according to the acquired intensity information of the echo optical signal, a port of the last optical splitter connected to the first ONU 120.

In step 712, the first ONU120 further determines the connection relationship between the first ONU120 and the optical fiber network. The first ONU120 may further determine information of the second port of the first ONU120 according to the acquired intensity information of the echo optical signal.

Step 711-.

Step 713, the first ONU120 sends a third uplink optical signal to the OLT110 to report the connection relationship between the first ONU120 and the optical fiber network.

The first ONU120 sends the third upstream optical signal to the OLT 110. The third upstream optical signal may carry a combination of one or more of: information of the first port of the first ONU120, information of the second port of the first ONU120, an identification of the optical fiber link in the ODN130 to which the first ONU120 is connected, or an identification of the first ONU 120.

Step 714, the OLT110 and the other ONUs 120 repeat steps 701 and 711 and 713 to determine the topology structure of the PON.

See the description of step 709 for details. In addition, in this case, the OLT110 may receive information of which port of the last-stage optical splitter is connected to, which is reported by each ONU120 of the ODN130, that is, the first port of each ONU 120; the OLT110 may also receive information of which port in the previous stage optical splitter, i.e., the second port of each ONU120, each final stage optical splitter in the ODN130 is connected to. Further, the OLT110 may determine the connection relationship between each ONU120 and the ODN130, i.e. determine the topology of the PON.

Alternatively, step 707 and 709, or step 714, are not performed by the OLT110, but by the network management server 140 communicatively coupled to the OLT 110. After receiving the intensity information of the echo optical signal reported by the first ONU120, the OLT110 sends the intensity information of the echo optical signal to the network management server 140, and then the network management server 140 determines the information of the first port of the first ONU120 according to the intensity information of the echo optical signal reported by the first ONU120, and may also determine the information of the second port of the last-stage optical splitter. Also, the network management server 140 or the OLT110 determines the identity of the ONU that transmits the upstream test optical signal. Further, the network management server 140 may determine a connection relationship between each ONU120 and the ODN130, that is, determine a topology structure of the PON. Reference may be made specifically to the foregoing steps, which are not described in detail herein.

In addition, the OLT110 may further send the received intensity information to the network management server 140 after receiving the intensity information of the echo optical signal reported by each ONU120, which is not limited in this application.

As an alternative, the embodiments of the present application may not perform steps 708, 709, 712, 713, 714, that is, steps 708, 709, 712, 713, or 714 are optional.

As an example, the ODN130 includes 2-stage splitters, which adopt a splitter 300-1 configuration, and the splitting ratio of each stage of splitters is 1 × 4 (i.e., N is 4). The trunk fiber length, the port number of the first stage splitter 131 (information of the second port), the reflectivity of the reflector at each port of the first stage splitter 131 (reflectivity of the reflector at the second port), the distribution fiber length, the port number of the second stage splitter 132 (information of the first port), the length of the branch fiber, and the reflectivity of the reflector at each port of the second stage splitter 131 (reflectivity of the reflector at the first port) in the ODN130 are shown in table 2.

TABLE 2.2 information for a level 1 × 16ODN130 System

It should be understood that the port information is a simple example and is not limited to the present application.

The OLT110 stores information of the first port and corresponding first reflection peak height and first reflection peak distance, and information of the second port and corresponding second reflection peak height and second reflection peak distance, as shown in table 3. Wherein, the pulse width of the uplink test optical signal corresponding to the table is 10 ns.

TABLE 3 Port information and reflection Peak correspondence

It should be understood that the OLT110 may obtain the information of the above tables 2 and 3 through testing before executing the embodiment of the present application, i.e., before step 701. In addition, the OLT110 may also derive the corresponding reflection peak heights based on the reflectivity of the reflectors of each port of the optical splitter to obtain the information of table 3. For example, it is derived from the following formula:

wherein H is the height of the reflection peak of the echo optical signal, RV is the reflectivity of the reflector at the port, Bns is the characteristic value (certain constant) of the optical fiber, and D is the pulse width of the uplink test optical signal. It should be understood that whether table 3 is obtained by testing or further calculated from table 2, the correspondence between the height of the first reflection peak and the information of the first port in table 3 is based on the correspondence between the reflectivity of the reflector of the first port and the information of the first port in table 2. Similarly, the correspondence between the height of the second reflection peak and the information of the second port in table 3 is also based on the correspondence between the reflectivity of the reflector of the second port and the information of the second port in table 2.

In step 701, the OLT110 authorizes any ONU (e.g., ONU1) to transmit the upstream test optical signal as the first ONU120 through the first downstream optical signal, and indicates that the pulse width of the upstream test optical signal is 10 ns. In step 702, the OLT110 notifies the ONU1 to measure the intensity of the echo optical signal of the upstream test optical signal. In step 703, the ONU1 transmits the upstream test optical signal, and the average optical power of the upstream test optical signal is 0dBm, the pulse width is 10ns, and the transmission frequency is 1 time per millisecond.

In step 704, ONU1 measures the strength of the echo signal of the upstream test optical signal according to the indication, and optionally, ONU1 may perform repeated measurement according to the transmission frequency to improve the sensitivity. The measured reflection curve of ONU1 is shown in fig. 8B. The upstream test optical signal is transmitted to the port of the second stage optical splitter through the branch optical fiber 135, and a first portion of the optical signal is reflected by the first reflector at the port, thereby forming a first reflection peak in the reflection curve, wherein the height of the first reflection peak is about 18.2dB, and the distance of the first reflection peak is about 1.9 km. The remaining upstream test optical signal then passes through a second stage splitter, which forms a first attenuation event in the reflection curve due to the attenuation characteristics of the splitter, the height of the first attenuation event being about 7dB, and the distance of the first attenuation event being about 1.9 km. The attenuated upstream test optical signal is transmitted to the port of the first-stage optical splitter through the distribution optical fiber 134, and a second part of the optical signal is reflected by the second reflector at the port, so that a second reflection peak in the reflection curve is formed, wherein the height of the second reflection peak is about 15dB, and the distance of the second reflection peak is about 8 km. The upstream test optical signal passing through the second reflector continues to be transmitted, and further passes through the first-stage optical splitter, a second attenuation event in the reflection curve is formed, the height of the second attenuation event is about 7dB, and the distance of the first attenuation event is about 8 km.

It should be understood that, in the embodiment of the present application, the first attenuation event and the first reflection peak are taken as examples for being equal in distance, and the difference between the distances may also be within a certain distance threshold range, for example, the OTDR test sensitivity is very high, and the distance accuracy of the test may reach centimeters; or the first-stage reflector is an external reflector and is arranged at a distance from the first-stage light splitter, and the like. The same is true for the relationship between the second attenuation event and the distance of the second reflection peak, which is not described in detail here.

In step 706, the ONU1 reports the measurement result to the OLT110 according to the instruction. The ONU1 can report the reflection curve, and the OLT110 obtains the reflection curve shown in fig. 8B. In step 707 and 708, the OLT110 may determine an event in the reflection curve, where the distance of the first reflection peak is equal to the distance of the first attenuation event, the distance of the second reflection peak is equal to the distance of the second reflection peak, and the distance of the first reflection peak is smaller than the distance of the second reflection peak. Accordingly, the OLT110 determines that the first reflection peak is due to the first reflector of the second stage splitter and that the second reflection peak is due to the second reflector of the first stage splitter. The OLT110 may determine information of the first port of the second-stage optical splitter connected to the ONU1 according to the measurement result reported by the ONU 1. Specifically, the OLT110 can obtain that the ONU1 is connected to the third port of the second-stage optical splitter according to the table 3 of the height 18.2dB of the first reflection peak. It should be understood that the measured 18.2dB differs from the 18dB recorded in table 3 by 0.2dB, possibly due to other reflections or noise etc. in the light path. The OLT110 allows an error in the threshold range when comparing the measured reflection peak data of the reflection curve with the stored reflection peak data. The threshold range may be preset in the OLT110 or may be default, e.g., 0.5 dB.

The OLT110 may further determine the connection relationship between the ONU1 and the ODN 130. As an alternative, if the OLT110 already stores the topology of the ODN130, the OLT110 determines the connection relationship of the ONU1 according to the topology stored in itself and the determined information of the first port. For example, if all ONUs in the street where ONU1 is located are connected to the first port of the first-stage splitter, the information on the second port of ONU1 is B₁. In turn, OLT110 may determine that ONU1 is connected to B of ODN130 based on the fact that ONU1 is connected to the first port of the first-stage optical splitter and ONU1 is connected to the third port of the second-stage optical splitter₁₃A port. As an optional manner, the OLT110 may also determine, according to the measurement result reported by the ONU1, information of the second port to which the ONU1 is connected, and further determine, according to the information of the second port of the ONU1 and the information of the first port, a connection relationship of the ONU 1. Specifically, the OLT110 may obtain that the information of the second port of the ONU1 is B according to the look-up table 3 of the height 15dB of the second reflection peak₁. The OLT110 may then determine that the ONU1 is connected to B of the ODN130₁₃A port.

The OLT110 may determine the information based on the distance between the first reflection peaks and the distance between the second reflection peaks. In addition, the OLT110 may further determine information of the second port of the ONU1, and then further determine information of the first port of the ONU1, which is not limited in this embodiment of the application.

Fig. 9 is a diagram of a method for identifying an ONU connection port according to an embodiment of the present disclosure, which is applied to a passive optical network system or an active optical network system. In the embodiment provided in fig. 7, the ONUi 120 sends an uplink test optical signal under the instruction of the OLT110, and then the ONUi 120 measures and reports the intensity of an echo optical signal of the uplink test optical signal, and the OLT110 determines information of the first port of the ONUi based on the intensity of the echo optical signal. In the embodiment shown in fig. 9, the ONUi 120 sends an uplink test optical signal under the instruction of the OLT110, and then all the ONUs 120 managed by the OLT110 measure and report the intensity of the echo optical signal of the uplink test optical signal, and the OLT110 determines, based on the intensities of the echo optical signals sent by all the ONUs 120, a fourth ONU120 connected to the same last-stage optical splitter as the ONUi 120, and then determines the information of the first port of the ONUi according to the intensity information of the echo optical signal sent by the fourth ONU120 and the intensity information of the echo optical signal sent by the ONUi 120. With reference to fig. 1 to fig. 6B, a method provided in an embodiment of the present application includes:

in step 901, the OLT110 instructs the first ONU120 (i.e., ONUi) to send an upstream test optical signal through the first downstream optical signal.

Step 901 is similar to step 701, and is not described herein again.

In step 902, the OLT110 instructs the first ONU120 and the second ONU120 to acquire the strength information of the echo signal of the upstream test optical signal through the third downstream optical signal.

For the convenience of reference, the echo optical signal of the upstream test optical signal sent by the first ONU120 is simply referred to as the echo optical signal of the first ONU120, and hereinafter, the echo optical signal that is not specifically described refers to the echo optical signal of the first ONU 120.

The second downlink optical signal carries indication information indicating that each ONU120 (the first ONU120 and the second ONU120) acquires the intensity information of the echo optical signal, and/or time information indicating that each ONU120 acquires the intensity information of the echo optical signal. The above-mentioned each ONU120 may acquire the intensity information of the echo optical signal, specifically, the each ONU120 may measure the received echo optical signal to obtain the intensity information of the echo optical signal, or the each ONU120 may receive the intensity information of the echo optical signal sent by the testing device connected to the ONU 120.

The time information for acquiring the echo optical signal may indicate a time (for example, a time delay) when each ONU120 starts to measure the echo optical signal, or may indicate a time when the test equipment corresponding to each ONU120 measures the echo optical signal. The measurement time of the echo optical signal of the first ONU120 by each ONU120 or the test equipment corresponding to each ONU120 may be the same or different.

Further, the time information for obtaining the intensity information of the echo optical signal may also indicate a time length for measuring the echo optical signal of the first ONU120, which may be referred to as a measurement time length for short; the third downlink optical signal may also carry the type of the obtained intensity information of the echo optical signal, such as the power of the echo optical signal, the reflection curve of the echo optical signal, and the like. For specific content, reference may be made to the content described in step 702, which is not described herein again.

It should be understood that steps 902 and 901 are not limited to being chronological. The third downlink optical signal and the first downlink optical signal may be the same optical signal, that is, step 902 and step 901 are executed simultaneously.

Step 903 is similar to step 703 in content, and is not described herein again.

Step 904, the first ONU120 and the second ONU120 obtain the intensity information of the echo signal of the upstream test optical signal sent by the first ONU120 according to the instruction of the OLT 110.

If the third downlink optical signal includes time information for acquiring the intensity information of the echo optical signal, each ONU120 or the test equipment corresponding to each ONU120 measures the echo optical signal of the first ONU120 according to the time information.

If the third downlink optical signal includes the type of the acquired intensity information of the echo optical signal, each ONU120 or the testing device corresponding to each ONU120 measures the echo optical signal of the first ONU120 according to the type to obtain the corresponding type of measurement data.

It should be understood that, if the first downlink optical signal does not include the time information, each ONU120 or the testing device corresponding to each ONU120 may also start measuring the echo optical signal immediately after receiving the echo optical signal of the first ONU 120. The same is true with respect to the type of intensity information of the acquired echo light signal, for example, measurement and data collection according to a preset reflection curve.

Step 905, the OLT110 instructs the first ONU120 and the second ONU120 to report the obtained measurement result through the fifth downlink optical signal.

The fifth downlink optical signal may carry indication information indicating that each ONU120 reports the strength information of the echo optical signal of the first ONU120, and/or time information reported by each ONU 120.

It is understood that step 902 and step 905 may be performed simultaneously. Wherein the third downlink optical signal and the fifth downlink optical signal may be the same optical signal. If step 901, step 902, and step 905 can be executed simultaneously, the third downlink optical signal and the fifth downlink optical signal may be the same optical signal.

Step 906, the first ONU120 and the second ONU120 report the measurement result to the OLT 110.

The measurement result may be strength information of the echo optical signal of the first ONU120 acquired by each ONU 120. As an alternative, the acquired intensity information of the echo optical signal may include a reflection curve of the echo optical signal. It should be understood that the reflection curve reported by each ONU120 may be continuous or discrete. Each ONU120 may report the obtained entire reflection curve; the curve segment where the event (reflection event, attenuation event, etc.) is located may also be reported, for example, the height of the reflection peak and the distance of the reflection peak corresponding to the reflection event, and the attenuation value and the distance corresponding to the attenuation event. Moreover, part of the second ONUs 120 may not report the measurement result, for example, a power value in the intensity information of the echo optical signal obtained by the part of the second ONUs 120 is lower than a certain preset threshold, or a height of no reflection peak in the reflection curve is greater than a certain preset threshold. As an optional manner, the acquired intensity information of the echo optical signal may further include information such as an average optical power of the echo optical signal.

The measurements may also carry a combination of one or more of the following: the identification of each ONU120, the time information of the echo optical signal of the first ONU120 measured by each ONU120 or the OTDR corresponding to each ONU120, and the like, so that the OLT110 can determine the intensity information of the echo optical signal of the first ONU120 transmitted by each ONU 120.

Step 907, the OLT110 determines the ONU120 connected to the same last-stage optical splitter as the first ONU120 according to the intensity information of the echo optical signal of the first ONU120 reported by the second ONU 120. The second ONU120 connected to the same last-stage optical splitter as the first ONU120 may be simply referred to as the fourth ONU 120.

It should be noted that the final splitter in the embodiment of the present application adopts the structure of the splitter 300-2, and the final sub-splitter refers to the final sub-splitter in the final splitter 300-2, for example, S shown in fig. 3B_Z1、S_Z2、…S_ZY、…S_ZPWherein, the splitting ratio of the final sub-splitter is 1 xQ or 2 xQ, Q is an integer larger than 1, for example Q is 2. The specific structure can be seen in the description of the embodiment shown in fig. 3B.

For the upstream test optical signal transmitted by the first ONU120, the received echo optical signal of the first ONU120 includes an optical signal reflected by the third reflector of the final sub-splitter and an optical signal reflected by the second reflector of the final sub-splitter in the upstream test optical signal; and the echo optical signal received by the fourth ONU120 comprises an optical signal in which the upstream test optical signal is reflected by the second reflector of the last sub-splitter; and the echo optical signals received by the ONUs 120 other than the fourth ONU120 in the second ONU120 do not include the optical signal reflected by the second reflector or the third reflector of the last-stage sub-splitter.

As an alternative, the OLT110 stores a threshold value of the intensity difference of the echo optical signals transmitted by the ONUs 120 connected to the same last-stage optical splitter, which may be referred to as the intensity difference threshold value of the ONUs 120 in the same group. The OLT110 determines that the difference between the intensity information of the echo optical signal of the first ONU120 sent by the fourth ONU120 and the intensity information of the echo optical signal of itself sent by the first ONU120 is smaller than the intensity difference threshold. For example, the OLT110 determines that the difference between the average power of the echo optical signal of the first ONU120 sent by the ONUh120 and the average power of the echo optical signal sent by the first ONU120 is smaller than the intensity difference threshold (specifically, the average power difference threshold here) of the ONUs 120 in the same group. The ONUh120 may determine to be an ONU120 of the same group as the first ONU120, i.e. the fourth ONU 120.

As an alternative, the OLT110 determines that the intensity information of the echo optical signal of the first ONU120 sent by the fourth ONU120 is the maximum intensity among the intensity information of the echo optical signal of the first ONU120 sent by the second ONU 120. The maximum intensity here may specifically be the instantaneous amplitude, the instantaneous power or the average power maximum of the echo light signal; it may also mean that the height of the reflection peak of the reflection curve is the largest, or that the number of reflection peaks reaching a certain height threshold is the largest. For example, the average power of the echo optical signal sent by the ONUj120 is-40 dB, and the average power of the echo optical signals sent by the other second ONUs 120 is lower than-55 dB, so that the OLT110 determines that the intensity of the echo optical signal sent by the ONUj120 is the maximum of the second ONUs 120, and the ONUj120 may be determined as the fourth ONU 120.

The ONU120 with the highest intensity may refer to one ONU120 with the highest intensity, or may refer to a plurality of ONUs 120 with the highest intensity. Specifically, one sub-final splitter is connected to Q ONUs 120, one of which is the first ONU120, and the ONU120 with the highest intensity at this time is the (Q-1) ONUs 120 with the highest intensity.

As an optional manner, the OLT110 determines that the intensity information of the echo optical signal of the first ONU120 sent by the fourth ONU120 includes a first reflection peak, and a difference between a distance of the first reflection peak sent by the fourth ONU120 and a distance of the first reflection peak sent by the first ONU is smaller than a distance threshold. The port of the final optical splitter to which the first ONU120 is connected is referred to as a first port. The distance of the first reflection peak sent by the fourth ONU120 indicates the distance between the fourth ONU120 and the reflector set by the first port, and the distance of the first reflection peak sent by the first ONU indicates the distance between the first ONU120 and the reflector set by the first port.

Step 908, the OLT110 determines the information of the first port of the first ONU120 according to the intensity information of the echo optical signal of the first ONU120 reported by the fourth ONU120 and the intensity information of the echo optical signal of the OLT itself reported by the first ONU 120.

As an optional manner, the OLT110 determines which last-stage sub-optical splitter the first ONU120 connects according to the intensity information of the echo optical signal reported by the fourth ONU120 and/or the intensity information of the echo optical signal reported by the first ONU120, which may also be referred to as an identifier of the last-stage sub-optical splitter. The intensity information of the echo optical signal reported by the fourth ONU120, the intensity information of the echo optical signal reported by the first ONU120, and the identifier of the last-stage sub-splitter have a corresponding relationship.

Optionally, the OLT110 stores correspondence between the identifiers of the different final-stage sub-optical splitters and the intensity information of the echo optical signal. The OLT110 may determine the identifier of the last sub-splitter connected to the first ONU120 according to the intensity information of the echo optical signal reported by the fourth ONU120 and/or the intensity information of the echo optical signal reported by the first ONU120, and the correspondence. Before step 901, OLT110 may obtain and store a correspondence between an identification of the last-stage sub-splitter and intensity information of the echo optical signal. Since there is a corresponding relationship between the identifier of the last sub-splitter and the reflectivity of the second reflector of the last sub-splitter (see the description of the embodiment in fig. 3B), when the upstream test optical signal sent by the first ONU120 is transmitted to the second reflector, part of the optical signal is reflected by the second reflector to form the echo optical signal, and the intensity information of the echo optical signal has a corresponding relationship with the reflectivity of the second reflector, and further, based on the corresponding relationship between the identifier of the last sub-splitter and the reflectivity of the second reflector, the corresponding relationship between the identifier of the last sub-splitter and the intensity information of the echo optical signal can be obtained. Specifically, the correspondence between the identifier of the last sub-splitter and the intensity information of the echo optical signal may be obtained through further derivation using an empirical calculation formula or a theoretical calculation formula, or through testing.

Optionally, the OLT110 stores a correspondence between an identifier of the final-stage sub optical splitter and a reflectivity of the upstream test optical signal transmitted from the final-stage sub optical splitter. Or the OLT110 stores the correspondence between the identifier of the last-stage sub optical splitter and the reflectivity of the second reflector of the last-stage sub optical splitter, the specific content is similar to the description in step 707, and refer to step 707, which is not described herein again.

It should be noted that the OLT110 may determine the identifier of the last-stage optical splitter connected to the first ONU120 according to the intensity information of the echo optical signal reported by one ONU120 of the fourth ONUs 120, may also determine the identifier according to the intensity information of the echo optical signal reported by the first ONU120 itself, or may also determine the identifier according to the intensity information of the echo optical signal reported by the fourth ONU120 and the first ONU120, for example, the identifier is determined according to an average value of the intensity information of the echo optical signal reported by the fourth ONU120 and the first ONU 120.

Further, the OLT110 determines to which port of the last-stage sub-splitter the first ONU120 is connected, and in combination with the determined identity of the last-stage sub-splitter, the OLT110 may determine information of the first port of the first ONU 120.

Alternatively, when Q is 2, that is, the number of the fourth ONUs 120 is 1, the OLT110 may determine to which port of the last-stage optical splitter the first ONU120 is connected by comparing the intensity information of the echo optical signal transmitted by the first ONU120 with the intensity information of the echo optical signal transmitted by the fourth ONU 120. For example, the OLT110 determines that the intensity information of the echo optical signal transmitted by the fourth ONU120 is smaller than the intensity information of the echo optical signal transmitted by the first ONU120, thereby determining that the fourth side port of the last sub-splitter to which the first ONU120 is connected is a port provided with a third reflector, and the fourth side port of the last sub-splitter to which the fourth ONU120 is connected is a port not provided with a third reflector.

It should be understood that, if the fourth port of the final sub-splitter connected to the first ONU120 is not provided with the third reflector, the strength information of the echo optical signals reported by the first ONU120 and the fourth ONU120 are almost equal. Then, at this time, the OLT110 may determine that the fourth side port of the last sub-optical splitter connected to the first ONU120 is a port without the third reflector, and the fourth side port of the last sub-optical splitter connected to the fourth ONU120 is a port with the third reflector, according to that the difference between the intensities of the echo optical signals reported by the first ONU120 and the fourth ONU120 is smaller than the intensity difference threshold.

Optionally, when Q is greater than 2, a third reflector is disposed on each of Q fourth side ports of the final sub-splitter, and the reflectivity of the third reflector corresponds to the port information of the fourth side port. The OLT110 may sort the intensity information of the echo optical signals sent by the fourth ONU120 and the first ONU120, and determine which port of the last-stage optical splitter the first ONU120 is connected to according to the corresponding relationship between the reflectivity of the third reflector and the port information of the fourth side port. For example, the average power of the echo optical signal transmitted by the first ONU120 is the lowest, the OLT110 determines that the fourth side port of the last sub-splitter connected to the first ONU120 is the port with the lowest reflectivity of the third reflector. The OLT110 may further obtain a corresponding relationship between the intensity information of the echo optical signal and the port information of the fourth side port according to the corresponding relationship between the reflectivity of the third reflector and the port information of the fourth side port, and further determine which port of the last-stage optical splitter connected to the first ONU120 is according to the intensity information of the echo optical signal sent by the first ONU120 and the corresponding relationship between the intensity information of the echo optical signal and the port information of the fourth side port.

As an optional way, the OLT110 determines, according to the strength information of the echo optical signal reported by the fourth ONU120 and the intensity information of the echo optical signal reported by the first ONU120, the information of the first port of the last-stage optical splitter port connected to the first ONU120, that is, the port information of the second-side port of the optical splitter 300-2. Optionally, the OLT110 stores a corresponding relationship between the port information of the second side port of the optical splitter 300-2 and the strength information of the echo optical signal, which is specifically described with reference to the embodiment shown in fig. 3B.

Alternatively, when Q is 2, one of the two fourth side ports of the final sub-splitter is provided with the third reflector, and the other is not provided with the third reflector. The OLT110 may determine whether the fourth side port of the last sub-splitter connected to the first ONU120 is provided with the third reflector by comparing the intensity information of the echo optical signal transmitted by the first ONU120 with the intensity information of the echo optical signal transmitted by the fourth ONU 120.

If the intensity information of the echo optical signal reported by the first ONU120 is greater than the intensity information of the echo optical signal sent by the fourth ONU120, it indicates that the fourth port connected to the first ONU120 is provided with a third reflector, and the OLT110 determines the port information of the second port connected to the first ONU120, that is, the information of the first port of the first ONU120, according to the intensity information of the echo optical signal sent by the first ONU120 and the corresponding relationship between the port information of the second port and the intensity information of the echo optical signal. The OLT110 may further determine information of the first port of the fourth ONU 120.

If the intensity information of the echo optical signal reported by the first ONU120 is less than or equal to the intensity information of the echo optical signal sent by the fourth ONU120, it indicates that the fourth port connected to the first ONU120 is not provided with the third reflector, and at this time, the OLT110 may not determine the port information connected to the first ONU 120. The OLT110 determines that the ONU120 sending the upstream test optical signal is the fourth ONU120, and then repeats step 901 and step 906, where the OLT110 receives the intensity information of the echo optical signal of the upstream test optical signal of the fourth ONU120 reported by the fourth ONU120, and determines the port information of the second side port connected to the fourth ONU120, that is, the information of the first port of the fourth ONU120, according to the intensity information of the echo optical signal of the fourth ONU120 reported by the fourth ONU120, so as to further determine the information of the first port of the first ONU 120.

Alternatively, when Q is 2 or Q is greater than 2, each fourth side port of the final sub-splitter is provided with a third reflector. The OLT110 determines the port information of the second side port connected to the first ONU120 according to the intensity information of the echo optical signal reported by the first ONU120 and the corresponding relationship between the port information of the second side port and the intensity information of the echo optical signal. At this time, the specific method is similar to that described in step 707, and is not described here again. The OLT110 may further determine port information of a second side port to which the fourth ONU120 is connected, in a similar manner to the method for determining the first ONU 120.

Step 909, the OLT110 may further determine the connection relationship between the first ONU120 and the optical fiber network.

Step 909 is similar to step 708, and specific contents can be referred to step 708, etc., which are not described herein again.

For ease of reference, the following description will be given by taking a 2-stage splitter as an example, and similarly for the ODN130 system of a multi-stage splitter, and therefore, the splitter of the previous stage of the final stage splitter is simply referred to as the first stage splitter. If the first-stage optical splitter adopts the optical splitter 300-2 shown in fig. 3B, the OLT determines a plurality of ONUs 120 connected to the last-stage optical splitter of the same first-stage optical splitter, and then determines information of the second ports of the first-stage optical splitters connected to the plurality of ONUs 120 according to the intensity information of the echo optical signals of the first ONUs 120 sent by the plurality of ONUs 120, thereby determining the connection relationship between the plurality of ONUs 120 and the optical fiber network. For details, refer to steps 907 and 908, which are not described herein again.

Step 910, the OLT110 and other ONUs 120 repeat steps 901 and 909 to determine the topology of the PON.

The OLT110 determines the identifier of the first ONU120 that sends the uplink test optical signal next time, and determines the topology structure of the PON, where the specific method is similar to that described in step 709, and refer to step 709, which is not described herein again. In addition, the OLT110 may select the fourth ONU120 as the first ONU120 that transmits the upstream test optical signal next time; or the OLT110 may select the ONU120 whose connection relationship is not determined as the first ONU120 that transmits the upstream test optical signal next time.

Alternatively, the steps 907-. Namely, 901 and 906 are repeatedly executed, that is, after the OLT110 receives the strength information of the echo optical signals of the upstream test optical signals sent by all the ONUs 120, the information of the first port and the information of the second port of each ONU120 are determined, and then the topology structure of the PON is determined. Alternatively, in this case, the OLT110 may configure each ONU120 with a first downlink optical signal in step 901, that is, the first downlink optical signal includes indication information that each ONU120 transmits an uplink test optical signal (for example, an identifier of each ONU120 that transmits the uplink test optical signal, and a time when each ONU120 transmits the uplink test optical signal), indication information that each ONU120 acquires intensity information of an echo optical signal (for example, a time delay, a time length, and/or a number of intensity information of the echo optical signal is measured), and the like. Specifically, see steps 901, 902, 905, etc., which are not described in detail herein.

As an alternative, the steps 907-. After receiving the intensity information of the echo optical signal reported by each ONU120, the OLT110 sends the intensity information of the echo optical signal to the network management server 140, and the network management server 140 determines the fourth ONU120 connected to the same last-stage optical splitter as the first ONU 120; information of which port, i.e., the first port, of the last-stage optical splitter to which the first ONU120 is connected; it is also possible to determine to which port, i.e., the second port, in the previous-stage optical splitter the final-stage optical splitter is connected. Also, the network management server 140 or the OLT110 determines the identity of the ONU that transmits the upstream test optical signal. Further, the network management server 140 may determine a connection relationship between each ONU120 and the ODN130, that is, determine a topology structure of the PON. Reference may be made specifically to the foregoing steps, which are not described in detail herein.

In addition, the OLT110 may further receive the strength information of the echo optical signal of the upstream test optical signal sent by all the ONUs, and then send the received strength information to the network management server 140, which is not limited in this application.

As an example, in the embodiment corresponding to fig. 9, the ODN130 includes 2-stage splitters, the splitting ratio of the first-stage splitter 131 is 1 × 2, the splitting ratio of the second-stage splitters 132-1 and 132-2 (i.e., the final-stage splitters) is 1 × 4, and the second-stage splitter 300-2 structure is adopted. Fig. 10 is a schematic diagram of a PON system according to an embodiment of the present application. Wherein the topology of ODN130 is known, such as second stage splitter 132-1 connected to B of first stage splitter 131₁The port, second stage splitter 132-2, is connected to B of the first stage splitter 131₂A port.The connection between the ONUs and the ODN130 is not known, and the connection between each ONU and the ODN130 is labeled in fig. 10 to make the method and structure of the embodiment of the present application clearer. The port number (information of the first port) of the second stage splitter 132 in the ODN130, the last-stage sub-splitter identification of the second stage splitter 132, and the second reflector (sub-splitter S) of the second stage splitter 132₂₁、S₂₂A reflector disposed on the suspended third side port), a third reflector (sub-splitter S) of the second stage splitter 132₂₁、S₂₂The reflector disposed on the fourth side port) as shown in table 4.

TABLE 4 information of the second stage splitter 132 in the ODN130

The OLT110 stores the identification of the last sub-splitter and the corresponding intensity of the echo optical signal, as shown in table 5. The strength of the upstream test optical signal corresponding to this table is 0dBm, assuming that the loss of the branch optical fiber is about 3 dB.

TABLE 5 intensity mapping relationship between port information and echo optical signals

It should be understood that the OLT110 may obtain the information of the above tables 4 and 5 through testing, calculation derivation, or manual recording before executing the embodiment of the present application, i.e., before step 901.

In step 901, the OLT110 authorizes any ONU (for example, ONU4) to transmit an upstream test optical signal as the first ONU120 by a first downstream optical signal, and the first downstream optical signal is configured such that the intensity (average optical power) of the upstream test optical signal is 0 dBm. In step 902, the OLT110 notifies each ONU (ONU 1-8 in this example) to measure the intensity of the echo optical signal of the upstream test optical signal. In step 903, the ONU4 transmits the upstream test optical signal, and the average optical power of the upstream test optical signal is 0dBm, the pulse width is 1ns, and the transmission frequency is 1 time per millisecond.

When the upstream test optical signal sent by ONU4 fills the trunk and distribution optical fibers, ONU1-ONU8 or the corresponding test equipment measures the intensity of the echo optical signal of the upstream test optical signal according to the measurement time information in step 902. For example, ONU1-ONU8 or a corresponding test device may measure the echo optical signal of ONU4 one or more times according to the time information in the third downstream optical signal, and then ONU1-ONU8 acquire the measured intensity of the echo optical signal. As an example, if each ONU or OTDR is a plurality of measurements, the intensities of the plurality of measurements may be averaged, and the average value is used as the intensity value of the echo optical signal of the upstream test optical signal.

The upstream test optical signal sent by the ONU4 is transmitted to the third reflector R through the branch optical fiber 135₃₂Said upstream test optical signal having a third portion of said optical signal being reflected by a third reflector R₃₂Reflect back to ONU 4; the rest of the upstream test optical signal passes through the sub-optical splitter S₂₂Then a fourth part of the optical signal is reflected by the second reflector R₂₂Reflecting, the fourth part of the optical signal passes through a sub-beam splitter S₂₂The latter is divided into a fifth part optical signal transmitted to ONU4 and a sixth part optical signal transmitted to ONU 3. Therefore, the echo optical signal received by the ONU4 includes the third partial optical signal, the fifth partial optical signal and other reflection points (e.g. sub-optical splitter S)₁₁Splitter 131), rayleigh scattered optical signals, etc. The echo optical signal received by the ONU3 includes the sixth partial optical signal and other reflection points (e.g. sub-splitter S)₁₁Splitter 131), rayleigh scattered optical signals, etc. The optical signals received by the

ONUs

1 and 2 only include other reflection points (e.g., sub-splitter S)₁₁Splitter 131), rayleigh scattered optical signals, etc. And the optical signals received by the ONUs 5-8 only include optical signals reflected by other reflection points (such as the optical splitter 131), rayleigh scattered optical signals, and the like.

Therefore, the same last-stage optical splitter (i.e., S) is connected to the first ONU (i.e., ONU4) that transmits the upstream test optical signal₂₂) Is measured by a fourth ONU (i.e. ONU3)Is greater than the intensity of the echo optical signal measured by other ONUs connected to different final-stage sub-splitters.

In step 906, each ONU (e.g., ONU1-ONU8) reports the measurement result of the echo optical signal of the first ONU to the OLT 110. The intensity distribution of the echo optical signal of the ONU4 measured by each ONU obtained by the OLT110 is shown in fig. 11. In step 907, the OLT110 determines that the fourth ONU connected to the same last-stage optical splitter as the first ONU is ONU3, and the intensity of the echo optical signal of the first ONU120 transmitted by ONU3 is the maximum intensity among the intensities of the echo optical signals transmitted by the second ONU120 (i.e., ONU1-ONU3, ONU5-ONU 8). Therefore, OLT110 determines that ONU3 is connected to the same last-stage sub-splitter as ONU 4. In addition, OLT110 may determine that a third ONU connected to the same second-level optical splitter as the first ONU is ONU1-ONU 3.

In step 908, OLT110 may determine the identity of the last-stage sub-splitter to which ONU3 is connected to ONU4, according to the echo optical signal strength of ONU4 measured by ONU 3. For example, OLT110 determines that the last sub-splitter connected to ONU3 and ONU4 has the identifier S by referring to table 5 for-42 dB echo optical signal strength measured by ONU3 in fig. 11₂₂. And further determining that ONU3 and ONU4 are connected to the last-stage sub-splitter S by comparing the intensity of the echo light signals measured by ONU3 and ONU4₂₂Which port of (2). For example, it is determined that the port of the last sub-splitter connected to ONU4 is provided with the third reflector, according to the fact that-42 dB of the echo optical signal intensity measured by ONU3 is smaller than-36 dB of the echo optical signal intensity measured by ONU 4. OLT110 may determine that ONU4 is connected to the fourth port of the second stage optical splitter and that ONU3 is connected to the third port of the second stage optical splitter. Further, in step 909, the OLT110 may also determine the connection relationship between the ONU4, the ONU3, and the ODN130, and the specific method is not described herein again.

Fig. 12 is a diagram of a method for determining ONU connection according to an embodiment of the present application, which is applied to a passive optical network system or an active optical network system. In the embodiment shown in fig. 12, similar to the embodiment shown in fig. 9, the ONUi 120 sends an upstream test optical signal under the instruction of the OLT110, and then all ONUs 120 in the ODN130 measure and report the intensity of the echo optical signal of the upstream test optical signal. The difference from the embodiment shown in fig. 9 is that the OLT110 determines a third ONU120 connected to the same last-stage optical splitter as the ONUi 120 based on the intensity of the echo optical signals transmitted by all the ONUs 120, and further determines information of the second port of the previous-stage optical splitter connected to the last-stage optical splitter of the ONUi based on the intensity information of the echo optical signals transmitted by the third ONU120 and the intensity information of the echo optical signals transmitted by the ONUi 120. In addition, the method of determining the information of the first port of the final splitter connected to ONUi is similar to the embodiments shown in fig. 7 and 9. With reference to fig. 1 to fig. 6B, a method provided in an embodiment of the present application includes:

step 1201-1206 is similar to steps 901-906, and will not be described herein.

The specific content of step 1207 may refer to step 907 or step 707, which is not described herein again.

In step 1208, the OLT110 determines, according to the intensity information of the echo optical signal of the first ONU120 reported by the second ONU120, the third ONU120 connected to the same last-stage optical splitter as the first ONU 120.

It should be noted that, in the embodiments of the present application, the structure of the optical splitter 300-1 or 300-2 may be adopted for each stage of the optical splitter, and the optical splitter 300-1 is taken as an example for description, and the optical splitter 300-2 is also similar.

For the upstream test optical signal transmitted by the first ONU120, the received echo optical signal of the first ONU120 includes a first part of the upstream test optical signal reflected by the reflector of the last-stage optical splitter and a second part of the upstream test optical signal reflected by the reflector of the previous-stage optical splitter of the last-stage optical splitter; the echo optical signal received by the third ONU120 includes a second part of the optical signal reflected by the reflector of the previous-stage optical splitter in the upstream test optical signal; the echo optical signals received by the ONUs 120 other than the third ONU120 in the second ONU120 do not include the first partial optical signal and the second partial optical signal.

As an alternative, the OLT110 determines that the difference between the intensity information of the echo optical signal of the first ONU120 sent by the third ONU120 and the intensity information of the echo optical signal of the first ONU120 is smaller than the first intensity difference threshold. The first intensity difference threshold may be preset (e.g., by testing) or may be determined based on the reflectivity of the final splitter.

As an optional way, the OLT110 determines that the difference between the intensity information of the echo optical signal of the first ONU120 sent by the third ONU120 and the intensity information of the echo optical signal sent by other ONUs in the second ONU120 is greater than the second intensity difference threshold. The second intensity difference threshold may be preset (e.g., by testing) or may be determined based on the reflectivity of a splitter stage prior to the splitter stage.

As an alternative, the OLT110 determines that the intensity information of the echo optical signal of the first ONU120 sent by the third ONU120 is the maximum intensity among the intensity information of the echo optical signal of the first ONU120 sent by the second ONU 120. The maximum intensity here can be seen in the description of step 907.

As an optional manner, the OLT110 determines that the intensity information of the echo optical signal of the first ONU120 sent by the third ONU120 includes a second reflection peak, and a difference between a distance of the second reflection peak sent by the third ONU120 and a distance of the second reflection peak sent by the first ONU is smaller than a distance threshold. The second reflection peak is formed based on a second part of the optical signal reflected by the reflector provided at the second port in the upstream test optical signal transmitted by the first ONU 120. The distance of the second reflection peak transmitted by the third ONU120 indicates the distance between the third ONU120 and the reflector provided in the second port. The distance of the second reflection peak transmitted by the first ONU120 indicates the distance between the first ONU120 and the reflector provided in the second port.

Step 1209, OLT110 may further determine the connection relationship between the first ONU120 and the optical network.

See steps 708 and 909 for details.

An alternative method of determining the information of the second port of the first ONU120 is described here. It should be understood that the information of the second ports of the first ONU120 and the third ONU120 is the same.

As an optional manner, the OLT110 determines the information of the second port according to the strength information of the echo optical signal of the first ONU120 sent by the third ONU 120. For example, the strength information of the echo optical signal includes an average power of the echo optical signal, and the OLT110 determines the strength information of the echo optical signal according to the average power of the echo optical signal transmitted by the third ONUs 120, and the stored information of the second port and the average power of the corresponding echo optical signal. Alternatively, the OLT110 may determine the reflectivity of the upstream test optical signal according to the average value of the average powers of the echo optical signals sent by the third ONUs 120 and the average power of the upstream test optical signal, and further determine the reflectivity according to the stored information of the second port and the reflectivity of the corresponding upstream test optical signal. Details are similar to step 708, see step 708.

As an optional manner, the OLT110 determines the information of the second port according to the strength information of the echo optical signal of the first ONU120 sent by the third ONU120 and the first ONU 120. For example, the intensity information of the echo light signal includes a height of the second reflection peak. The OLT110 determines from the average of the heights of the second reflection peaks sent by the third ONU120 and the first ONU120, and the stored information of the second port and the height of the corresponding second reflection peak. In addition, the OLT110 may further determine the reflectivity of the upstream test optical signal according to an average value of the heights of the second reflection peaks sent by the third ONU120 and the first ONU120, and further determine the information of the second port, and the like. See steps 708, 710' for details.

Determining the information of the second port based on the strength information of the echo optical signals of the ONUs 120 connected to the same final splitter can reduce errors. See the description of step 710' for details.

Steps 1210, 1210 ', 1011' are similar to steps 910, 910 ', 911' and will not be described herein.

Alternatively, steps 1207-1209, 1011' are performed not by OLT110 but by network management server 140 which is communicatively coupled to OLT 110. After receiving the intensity information of the echo optical signal of each ONU120 reported by each ONU120, the OLT110 sends the intensity information of the echo optical signal to the network management server 140, so that the network management server 140 can determine which port of the last optical splitter connected to the first ONU120 is, that is, information of the first port of the first ONU120, according to the intensity information of the echo optical signal; the network management server 140 may also determine a third ONU120 that is connected to the same last-stage splitter as the first ONU 120; the network management server 140 may also determine information of which port in the previous stage optical splitter the last stage optical splitter is connected to, i.e., the second port of the first ONU 120. Also, the network management server 140 or the OLT110 determines the identity of the ONU that transmits the upstream test optical signal. Further, the network management server 140 may determine a connection relationship between each ONU120 and the ODN130, that is, determine a topology structure of the PON. Reference may be made specifically to the foregoing steps, which are not described in detail herein.

Fig. 13 is a schematic structural diagram of an apparatus provided in the present application. The OLT110, the ONU120, or the network management server 140 in the present application may also be implemented by the apparatus in fig. 13.

The apparatus includes one or more processors 1301, where the processors 1301 may also be referred to as processing units, which may implement certain control functions. The processor 601 may be a general purpose Central Processing Unit (CPU), microprocessor, application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the teachings of the present application.

As an alternative, the processor 1301 may also have instructions 1304 stored therein, and the instructions 1304 may be executed by the processor 1301, so that the apparatus performs the method corresponding to the OLT110, the ONU120, or the network management server 140 described in the above method embodiment.

As an alternative, the device may also include one or more memories 1302. The Memory 1302 may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these.

The memory 1302 may store instructions 1305, which instructions 1305 may be executed on the processor 1301, causing the apparatus to perform the method corresponding to the OLT110, the ONU120 or the network management server 140 described in the above method embodiments. The memory 1302 may also store data, such as strength information of the echo optical signal acquired by the ONU120, and the like. The memory 1302 may be separate and coupled to the processor 1301 via a bus. Memory 1302 may also be integrated with processor 1301.

As an optional manner, the apparatus may further include a transceiver 1303, where the transceiver 1303 may also be referred to as a transceiver unit, a transceiver circuit, or the like, and may implement a function of transceiving optical signals. Reference may be made in particular to the description of the above-mentioned method embodiments.

The present application also provides a readable storage medium for storing the execution instructions for the device (OLT110, ONU120, or network management server 140) shown in fig. 13. The above method may be implemented when the stored execution instructions are executed by at least one processor of the device.

The present application also provides a program product comprising execution instructions, which may be stored in a readable medium. The at least one processor of the device (OLT110, ONU120, or network management server 140) shown in fig. 13 may read the execution instruction from the readable medium to implement the method.

The present application further provides a system for determining ONU connection, which includes an OLT110, an ODN130, and a plurality of ONUs 120, where the OLT110 is connected to the ONUs 120 through the ODN 130. The OLT110 may perform any steps performed by the OLT110 in the above embodiments; the ONU120 may perform any of the steps performed by the ONU120 in the above embodiments. The final splitter in the ODN130 can be either splitter 300-1 or splitter 300-2; as an alternative, each stage of the splitter in the ODN130 can be either the splitter 300-1 or the splitter 300-2. For details, reference may be made to the foregoing embodiments, which are not described herein again.

The present application further provides a system for determining ONU connection, where the system includes a network management server 140 and a passive optical network PON system 100, the PON system 100 may send intensity information of an echo optical signal of a first ONU120 obtained by the first ONU120 to the network management server 140, the network management server 140 may determine information of a first port of the first ONU120 according to the intensity information of the echo optical signal of the first ONU120, and the network management server 140 may further determine a connection relationship of the first ONU120 in the ODN 130.

As an optional manner, the PON system 100 may further send the strength information of the echo optical signal of the first ONU120, which is acquired by the second ONU120, to the network management server 140, and the network management server 140 may further determine, according to the strength information of the echo optical signal of the first ONU120 of the second ONU120, a third ONU120 connected to the same last-stage optical splitter as the first ONU 120. The network management server 140 may further determine a fourth ONU120 connected to the same last-stage optical splitter as the first ONU120, based on the intensity information of the echo optical signal of the first ONU120 of the second ONU 120. For details, reference may be made to the foregoing embodiments, which are not described herein again.

The various numerical references mentioned in the embodiments of the present application are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application. The sequence numbers of the above processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not be limited in any way to the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps (step) described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may 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 loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, 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, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for identifying an ONU connection port of an Optical Network Unit (ONU), which is applied to the ONU, and comprises the following steps:

transmitting a first uplink optical signal;

receiving an echo optical signal generated in an optical fiber network by the first uplink optical signal;

acquiring the intensity information of the echo optical signal, and determining the information of the first port of the last-stage optical splitter connected with the ONU according to the intensity information of the echo optical signal,

wherein the intensity information of the echo optical signal comprises a height of a first reflection peak in a reflection curve of the echo optical signal, the first reflection peak being formed based on a first portion of the first uplink optical signal that is reflected by the first port-disposed reflector, the height of the first reflection peak indicating an intensity of the first portion of the optical signal,

the determining the information of the first port according to the strength information of the echo optical signal includes:

determining information of the first port according to a height of the first reflection peak, wherein a correspondence between the height of the first reflection peak and the information of the first port is based on a correspondence between a reflectivity of a reflector provided at the first port and the information of the first port,

the intensity information of the echo optical signal further includes a height of a second reflection peak in a reflection curve of the echo optical signal, the second reflection peak being formed based on a second part of the first uplink optical signal reflected by a reflector provided at a second port, the height of the second reflection peak indicating an intensity of the second part of the optical signal, a distance of the second reflection peak indicating a distance between the ONU and the reflector provided at the second port, a distance of the first reflection peak indicating a distance between the ONU and the reflector provided at the first port, the distance of the second reflection peak being greater than the distance of the first reflection peak,

the method further comprises the following steps: determining information of the second port according to a height of the second reflection peak, wherein the second port is a port of a previous-stage optical splitter connected to a last-stage optical splitter connected to the ONU, and a correspondence between the height of the second reflection peak and the information of the second port is based on a correspondence between a reflectivity of a reflector provided by the second port and the information of the second port; and determining the connection relationship between the ONU and the optical fiber network according to the information of the first port and the information of the second port.

2. The method of claim 1, further comprising:

and sending a second uplink optical signal to an Optical Line Terminal (OLT), wherein the second uplink optical signal is used for requesting the OLT to authorize the ONU to send the first uplink optical signal.

3. The method of claim 1 or 2, further comprising:

receiving a first downlink optical signal sent by an OLT, wherein the first downlink optical signal carries indication information indicating that the ONU sends the first uplink optical signal, and/or time information indicating that the ONU sends the first uplink optical signal.

4. The method of claim 1 or 2, further comprising:

and determining the connection relation between the ONU and the optical fiber network according to the information of the first port.

5. The method of claim 1 or 2, further comprising: and sending a third uplink optical signal to the OLT, wherein the third uplink optical signal carries the information of the first port or the connection relationship between the ONU and the optical fiber network.

6. A method of identifying an ONU connection port, the method comprising:

the method comprises the steps that the equipment receives intensity information of an echo optical signal sent by a first Optical Network Unit (ONU), wherein the echo optical signal is an echo optical signal generated in an optical fiber network by a first uplink optical signal sent by the first ONU;

the apparatus determines information of a first port of a last optical splitter connected to the first ONU according to intensity information of an echo optical signal transmitted by the first ONU, the intensity information of the echo optical signal transmitted by the first ONU including a height of a first reflection peak in a reflection curve of the echo optical signal, the first reflection peak being formed based on a first part of the first upstream optical signal reflected by a reflector provided at the first port, the height of the first reflection peak indicating an intensity of the first part of the optical signal,

the device determines the information of the first port according to the intensity information of the echo optical signal, and the determining includes:

the device determines the information of the first port according to the height of the first reflection peak, wherein the height of the first reflection peak has a corresponding relation with the information of the first port, and the corresponding relation between the height of the first reflection peak and the information of the first port is based on the corresponding relation between the reflectivity of a reflector arranged at the first port and the information of the first port,

the intensity information of the echo optical signal sent by the first ONU further includes a height of a second reflection peak in a reflection curve of the echo optical signal, the second reflection peak being formed based on a second part of the optical signal reflected by a reflector provided at a second port in the first uplink optical signal, the height of the second reflection peak indicating the intensity of the second part of the optical signal, a distance of the second reflection peak indicating a distance between the first ONU and the reflector provided at the second port, a distance of the first reflection peak indicating a distance between the first ONU and the reflector provided at the first port, a distance of the second reflection peak being greater than a distance of the first reflection peak,

the method further comprises the following steps: the device determines information of the second port according to a height of the second reflection peak, where the second port is a port of a previous-stage optical splitter connected to a last-stage optical splitter connected to the first ONU, the height of the second reflection peak and the information of the second port have a correspondence, and the correspondence between the height of the second reflection peak and the information of the second port is based on a correspondence between a reflectivity of a reflector provided at the second port and the information of the second port; and the equipment determines the connection relation between the first ONU and the optical fiber network according to the information of the first port and the information of the second port.

7. The method of claim 6, further comprising:

and the equipment determines the connection relation between the first ONU and the optical fiber network according to the information of the first port.

8. The method of claim 6 or 7, further comprising:

the equipment determines a fourth ONU which is connected with the same final-stage optical splitter as the first ONU according to the intensity information of an echo optical signal sent by a second ONU, wherein the second ONU is other ONUs except the first ONU in an optical network system, and the final-stage optical splitter is the last-stage optical splitter in the final-stage optical splitter;

and the equipment determines the information of the port of the final optical splitter connected with the fourth ONU according to the intensity information of the echo optical signal sent by the first ONU and the intensity information of the echo optical signal sent by the fourth ONU.

9. The method according to claim 8, wherein the device determines information on a port of a last optical splitter connected to the fourth ONU, specifically comprising:

the equipment determines the identifier of the corresponding last-stage sub-optical splitter connected with the first ONU according to the intensity information of the echo optical signal sent by the first ONU and/or the intensity information of the echo optical signal sent by the fourth ONU;

based on the identification of the last sub-splitter connected to the first ONU, the apparatus further determines information of the port of the last sub-splitter connected to the fourth ONU according to the intensity information of the echo optical signal sent by the first ONU and the intensity information of the echo optical signal sent by the fourth ONU.

10. The method according to claim 6 or 7, wherein the device is an optical line termination, OLT, and wherein the method further comprises: the OLT sends a first downlink optical signal, wherein the first downlink optical signal carries indication information indicating that the first ONU sends the first uplink optical signal, and/or time information indicating that the first ONU sends the first uplink optical signal.

11. The method of claim 10, further comprising:

and the OLT sends a second downlink optical signal, wherein the second downlink optical signal carries indication information indicating that the first ONU acquires the intensity information of the echo optical signal, and/or time information indicating that the first ONU acquires the intensity information of the echo optical signal.

12. The method of claim 10, further comprising: the OLT sends a third downlink optical signal, the third downlink optical signal carries indication information indicating that the first ONU and the second ONU acquire the intensity information of the echo optical signal, and/or time information indicating that the first ONU and the second ONU acquire the intensity information of the echo optical signal, and the second ONU is other ONUs except the first ONU in the optical network system.

13. The method of claim 6 or 7, wherein the device is a network management server.

14. An optical network unit, ONU, comprising:

an uplink optical signal transmitter for transmitting a first uplink optical signal;

the echo optical signal receiver is used for receiving an echo optical signal generated by the first uplink optical signal in the optical fiber network;

a processing module, configured to obtain intensity information of the echo optical signal, and determine information of a first port of a last optical splitter connected to the ONU according to the intensity information of the echo optical signal,

wherein the intensity information of the echo optical signal comprises a height of a first reflection peak in a reflection curve of the echo optical signal, the first reflection peak being formed based on a first portion of the first uplink optical signal that is reflected by a reflector disposed at a first port, the height of the first reflection peak indicating an intensity of the first portion of the optical signal,

the processing module is configured to determine information of the first port according to the intensity information of the echo optical signal, and includes:

the processing module is configured to determine information of the first port according to a height of the first reflection peak, where a correspondence between the height of the first reflection peak and the information of the first port is based on a correspondence between a reflectivity of a reflector provided at the first port and the information of the first port,

the intensity information of the echo optical signal further includes a height of a second reflection peak in a reflection curve of the echo optical signal, the second reflection peak being formed based on a second part of the first uplink optical signal reflected by a reflector provided at a second port, the height of the second reflection peak indicating an intensity of the second part of the optical signal, a distance of the second reflection peak indicating a distance between the ONU and the reflector provided at the second port, a distance of the first reflection peak indicating a distance between the ONU and the reflector provided at the first port, the distance of the second reflection peak being greater than the distance of the first reflection peak;

the processing module is further configured to determine information of the second port according to a height of the second reflection peak, where the second port is a port of a previous-stage optical splitter connected to a last-stage optical splitter connected to the ONU, and a correspondence between the height of the second reflection peak and the information of the second port is based on a correspondence between a reflectivity of a reflector provided by the second port and the information of the second port;

the processing module is further configured to determine a connection relationship between the ONU and the optical fiber network according to the information of the first port and the information of the second port.

15. The ONU of claim 14, further comprising:

the uplink optical signal transmitter is further configured to transmit a second uplink optical signal to an optical line terminal OLT, where the second uplink optical signal is used to request the OLT to authorize the ONU to transmit the first uplink optical signal.

16. The ONU of claim 15, further comprising:

and the downlink optical signal receiver is configured to receive a first downlink optical signal sent by the OLT, where the first downlink optical signal carries indication information indicating that the ONU sends the first uplink optical signal, and/or time information indicating that the ONU sends the first uplink optical signal.

17. The ONU of claim 14 or 15, further comprising:

the processing module is further configured to determine a connection relationship between the ONU and the optical fiber network according to the information of the first port.

18. The ONU of claim 14 or 15, further comprising:

the uplink optical signal transmitter is further configured to transmit a third uplink optical signal to the OLT, where the third uplink optical signal carries information of the first port or a connection relationship between the ONU and the optical fiber network.

19. An apparatus for identifying an ONU connection port in an optical network unit, comprising:

the optical network unit comprises a receiver and a control unit, wherein the receiver is used for receiving intensity information of an echo optical signal sent by a first ONU, and the echo optical signal is an echo optical signal generated in an optical fiber network by a first uplink optical signal sent by the first ONU;

a processing module for determining information of a first port of a last optical splitter connected to the first ONU according to the intensity information of the echo optical signal sent by the first ONU

Wherein the intensity information of the echo optical signal sent by the first ONU includes a height of a first reflection peak in a reflection curve of the echo optical signal, the first reflection peak is formed based on a first part of the first uplink optical signal reflected by a reflector arranged at the first port, and the height of the first reflection peak indicates the intensity of the first part of the optical signal,

the processing module is configured to determine information of the first port according to a height of the first reflection peak, where there is a correspondence between the height of the first reflection peak and the information of the first port, and the correspondence between the height of the first reflection peak and the information of the first port is based on a correspondence between a reflectivity of a reflector provided at the first port and the information of the first port,

the intensity information of the echo optical signal sent by the first ONU further includes a height of a second reflection peak in a reflection curve of the echo optical signal, the second reflection peak is formed based on a second part of the optical signal reflected by a reflector provided at a second port in the first uplink optical signal, the height of the second reflection peak indicates the intensity of the second part of the optical signal, a distance of the second reflection peak indicates a distance between the first ONU and the reflector provided at the second port, a distance of the first reflection peak indicates a distance between the first ONU and the reflector provided at the first port, and a distance of the second reflection peak is greater than a distance of the first reflection peak;

the processing module is further configured to determine information of the second port according to a height of the second reflection peak, where the second port is a port of a previous-stage optical splitter connected to a last-stage optical splitter connected to the first ONU, a correspondence relationship exists between the height of the second reflection peak and the information of the second port, and the correspondence relationship between the height of the second reflection peak and the information of the second port is based on a correspondence relationship between a reflectivity of a reflector provided at the second port and the information of the second port;

the processing module is further configured to determine a connection relationship between the first ONU and the optical fiber network according to the information of the first port and the information of the second port.

20. The apparatus of claim 19, further comprising:

the processing module is further configured to determine, according to intensity information of an echo optical signal sent by a second ONU, a fourth ONU connected to the same last-stage optical splitter as the first ONU, where the second ONU is another ONU in the optical network system except the first ONU, and the last-stage optical splitter is a last-stage optical splitter in the last-stage optical splitter;

the processing module is further configured to determine information of a port of a last optical splitter connected to the fourth ONU, according to the intensity information of the echo optical signal sent by the first ONU and the intensity information of the echo optical signal sent by the fourth ONU.

21. The apparatus according to claim 20, wherein the processing module is configured to determine information about a port of a last optical splitter connected to the fourth ONU, and specifically comprises:

the processing module is configured to:

determining the identifier of the corresponding last-stage sub-optical splitter connected with the first ONU according to the intensity information of the echo optical signal sent by the first ONU and/or the intensity information of the echo optical signal sent by the fourth ONU;

22. The apparatus according to any of claims 19-21, wherein the apparatus is an optical line termination, OLT, the OLT further comprising: and the downlink optical signal transmitter is configured to transmit a first downlink optical signal, where the first downlink optical signal carries indication information indicating that the first ONU transmits the first uplink optical signal, and/or time information indicating that the first ONU transmits the first uplink optical signal.

23. The apparatus according to any of claims 19-21, wherein the apparatus is a network management server.

24. A passive optical network system comprising an optical line terminal OLT, an optical distribution network, ODN, and a plurality of optical network units, ONUs, wherein the OLT is connected to the plurality of ONUs through the ODN, and wherein at least one of the ONUs is an ONU according to any one of claims 14-18.

25. The system of claim 24, wherein the ODN comprises a final optical splitter, the final optical splitter comprising a first side port and a second side port, wherein the first side port is configured to connect to a previous stage optical splitter or the OLT, and wherein the second side port is configured to connect to the plurality of ONUs;

a first reflector is arranged on a second side port connected with the at least one ONU, and the port information of the second side port and the reflectivity of the first reflector of the second side port have a corresponding relation;

and the second side-port of the final optical splitter to which the at least one ONU is connected is the first port of the at least one ONU.

26. A passive optical network system comprising an optical line terminal OLT, an optical distribution network, ODN, and a plurality of optical network units, ONUs, wherein the OLT is connected to the plurality of ONUs through the ODN, and wherein the OLT is an apparatus according to any one of claims 19-22.

27. A communication system, comprising a network management device, a passive optical network system,

the passive optical network system is configured to send, to the network management device, intensity information of an echo optical signal generated in an optical fiber network by a first uplink optical signal acquired by a first ONU and/or a second ONU, where the first ONU is an ONU that sends the first uplink optical signal, and the second ONU is another ONU in the passive optical network system except the first ONU;

the network management device is configured to perform the method of any of claims 6-9.

28. An optical splitter supporting port identification, the optical splitter supporting port identification comprising N second side ports; the second side port is used for connecting a rear-stage optical splitter or an ONU, and N is an integer greater than 1; the port identification supporting optical splitter comprises P last-stage sub-optical splitters, the last-stage sub-optical splitter is the last-stage sub-optical splitter in the port identification supporting optical splitter, the last-stage sub-optical splitter comprises 1 or 2 third side ports and Q fourth side ports, the third side ports are used for being connected with the previous-stage sub-optical splitter or suspended, the fourth side ports of the last-stage sub-optical splitter are the second side ports of the port identification supporting optical splitter, P is a positive integer, and Q is an integer larger than 1; 1 of said third side ports of each of said final sub-splitters is provided with a second reflector, and at least Q-1 of said fourth side ports of each of said final sub-splitters is provided with a third reflector; wherein the identifier of the final sub-splitter corresponds to a reflectivity of the second reflector of the final sub-splitter, or the identifier of the final sub-splitter corresponds to a reflectivity of the third reflector of the final sub-splitter.

29. The optical splitter supporting port identification of claim 28, wherein the last sub-optical splitter comprises 2 third side ports, 1 third side port of the last sub-optical splitter is connected to the previous sub-optical splitter, and the other 1 third side port of the last sub-optical splitter is floating;

the 1 third side port of each final sub-splitter is provided with a second reflector, which specifically includes: the suspended third side port of each final sub-splitter is provided with the second reflector.