Passive optical network coexistence apparatus, system and method

Abstract

Disclosed in the embodiments of the present application are a passive optical network coexistence apparatus, system and method. The passive optical network coexistence apparatus comprises an optical splitter, a receiver and a coexistence risk screening module, wherein the optical splitter is used for receiving a first-system uplink optical signal sent by a first-system optical network unit (ONU), splitting the first-system uplink optical signal into a first branch optical signal and a second branch optical signal, transmitting the first branch optical signal to the receiver, and transmitting the second branch optical signal to the coexistence risk screening module; the receiver is used for receiving the first branch optical signal and converting the first branch optical signal into an electrical signal for output; and the coexistence risk screening module is used for receiving the second branch optical signal and determining whether the first-system ONU corresponding to the first-system uplink optical signal is a coexistence-risk ONU, wherein the difference between the signal wavelength of the first-system uplink optical signal of the coexistence-risk ONU and the signal wavelength of a second-system downlink optical signal of a multi-system optical line terminal (OLT) is less than a preset threshold value.

Description

Passive Optical Network Coexistence Devices, Systems and Methods

[0001] Cross-references

[0002] This application claims priority to Chinese Patent Application No. 202510126864.6, filed on January 27, 2025, entitled “Passive Optical Network Coexistence Device, System and Method”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of optical communication technology, and in particular to a passive optical network coexistence device, system and method. Background Technology

[0004] Currently, PON (Passive Optical Network) systems have undergone three generations of development, including GPON (Gigabit-Capable Passive Optical Network), EPON (Ethernet Passive Optical Network), second-generation 10G EPON (10Gigabit-capable Ethernet Passive Optical Network) and XG(S)-PON (10Gigabit-capable Passive Optical Network or 10Gigabit-capable Symmetric Passive Optical Network), and third-generation 50GPON (50Gigabit-capable Passive Optical Network). The coexistence of 50G PON with traditional PON mainly involves the coexistence and evolution of both EPON and GPON systems. In the GPON system, 50G PON wavelength planning supports coexistence with GPON and XG / XG(S)-PON wavelengths, and can be upgraded through external multiplexers / demultiplexers or multiplexers / demultiplexers with built-in optical modules. However, EPON uplink wavelengths and 10G EPON asymmetric broadband uplink wavelengths range from 1260 to 1360 nm, often using low-cost multi-mode FP (Fabry-Perot) lasers with a spectral range close to 100 nm, which conflicts with both uplink and downlink operating wavelengths of 50G PON. Currently, the common approach to address this issue is to upgrade and replace all existing EPON and 10G EPON asymmetric broadband terminals, allowing only 10G EPON and 50G PON systems to coexist. While this approach solves the coexistence problem to some extent, it also wastes a large number of EPON terminal devices already deployed in the network. Therefore, a technical solution that can simultaneously solve the coexistence problem and the resource waste problem of passive optical networks is urgently needed. Summary of the Invention

[0005] This application provides a passive optical network coexistence device, system, and method.

[0006] In a first aspect, embodiments of this application provide a passive optical network coexistence device, which includes: a splitter, a receiver, and a coexistence risk screening module; the splitter is used to receive a first-mode uplink optical signal sent by a first-mode optical network unit (ONU); split the first-mode uplink optical signal into a first-mode split optical signal and a second-mode split optical signal; transmit the first-mode split optical signal to the receiver, and transmit the second-mode split optical signal to the coexistence risk screening module; the receiver is used to receive the first-mode split optical signal and convert the first-mode split optical signal into an electrical signal for output; the coexistence risk screening module is used to receive the second-mode split optical signal and determine whether the first-mode ONU corresponding to the first-mode uplink optical signal is a coexistence risk ONU; wherein, the difference between the signal wavelength of the first-mode uplink optical signal of the coexistence risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode optical line terminal (OLT) is less than a preset threshold.

[0007] Secondly, embodiments of this application provide a passive optical network coexistence system, which includes: a multi-standard OLT, an optical distribution network (ODN), and a first-standard ONU; the multi-standard OLT and the first-standard ONU are connected through the ODN; the multi-standard OLT is configured with a passive optical network coexistence device as described in the first aspect; the first-standard ONU is used to send a first-standard uplink optical signal to the multi-standard OLT; the multi-standard OLT is used to determine, through the passive optical network coexistence device, whether the first-standard ONU corresponding to the first-standard uplink optical signal is a coexistence risk ONU; wherein, the difference between the signal wavelength of the first-standard uplink optical signal of the coexistence risk ONU and the signal wavelength of the second-standard downlink optical signal of the multi-standard OLT is less than a preset threshold.

[0008] Thirdly, embodiments of this application provide a passive optical network (PON) coexistence method, which includes: receiving a first-mode uplink optical signal transmitted by a first-mode ONU; dividing the first-mode uplink optical signal into a first-mode split optical signal and a second-mode split optical signal; converting the first-mode split optical signal into an electrical signal for output; and determining whether the first-mode ONU is a coexistence risk ONU based on a target split optical signal; wherein the target split optical signal includes: the second-mode split optical signal, or the first-mode split optical signal and the second-mode split optical signal; and the difference between the signal wavelength of the first-mode uplink optical signal of the coexistence risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode OLT is less than a preset threshold.

[0009] Fourthly, embodiments of this application provide an electronic device including a processor and a memory electrically connected to the processor, the memory storing a computer program, and the processor being configured to call and execute the computer program from the memory to implement the passive optical network coexistence method as described in the third aspect.

[0010] Fifthly, embodiments of this application provide a readable storage medium for storing a program or instructions that are executed by a processor to implement the passive optical network coexistence method as described in the third aspect.

[0011] In a sixth aspect, embodiments of this application provide a computer program product, the computer program product including a computer program stored on a non-transitory computer-readable storage medium, the computer program including a program or instructions, which, when executed, implement the passive optical network coexistence method as described in the third aspect. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in one or more embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in one or more embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 is a schematic diagram of a passive optical network coexistence device provided in an embodiment of this application;

[0014] Figure 2 is a schematic diagram of a passive optical network coexistence device provided in another embodiment of this application;

[0015] Figure 3 is a schematic diagram of the filtering loss curve of a wavelength screening filter provided in an embodiment of this application;

[0016] Figure 4a is a schematic diagram of the structure of a passive optical network coexistence device provided in an embodiment of this application;

[0017] Figure 4b is a schematic diagram of a passive optical network coexistence device provided in another embodiment of this application;

[0018] Figure 5 is a schematic diagram of a passive optical network coexistence system provided in an embodiment of this application;

[0019] Figure 6 is a flowchart illustrating a method for determining coexisting risk ONUs according to an embodiment of this application;

[0020] Figure 7 is a schematic diagram of the optical path of the optical components of a passive optical network coexistence device provided in an embodiment of this application;

[0021] Figure 8 is a schematic diagram of a wavelength-selective detection APD provided in an embodiment of this application;

[0022] Figure 9 is a schematic diagram of a passive optical network coexistence device provided in another embodiment of this application;

[0023] Figure 10 is a schematic diagram of the structure of a passive optical network coexistence device provided in another embodiment of this application;

[0024] Figure 11 is a schematic diagram of a passive optical network coexistence system provided in another embodiment of this application;

[0025] Figure 12 is a schematic diagram of the optical path of the optical components of a passive optical network coexistence device provided in another embodiment of this application;

[0026] Figure 13a is a schematic diagram of a passive optical network coexistence system provided in an embodiment of this application;

[0027] Figure 13b is a schematic diagram of a passive optical network coexistence system provided in another embodiment of this application;

[0028] Figure 14 is a flowchart illustrating a passive optical network coexistence method provided in an embodiment of this application;

[0029] Figure 15 is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0031] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein.

[0032] Figure 1 shows a schematic diagram of a passive optical network coexistence device provided in an embodiment of this application. Referring to Figure 1, the passive optical network coexistence device 100 includes a splitter 11, a receiver 12, and a coexistence risk screening module 13.

[0033] The optical splitter 11 receives a first-mode uplink optical signal transmitted by a first-mode ONU (Optical Network Unit); splits the first-mode uplink optical signal into a first-mode split optical signal and a second-mode split optical signal; transmits the first-mode split optical signal to the receiver 12, and transmits the second-mode split optical signal to the coexistence risk screening module 13. The receiver 12 receives the first-mode split optical signal and converts it into an electrical signal for output. The coexistence risk screening module 13 receives the second-mode split optical signal and determines whether the first-mode ONU corresponding to the first-mode uplink optical signal is a coexistence risk ONU.

[0034] Among them, the difference between the signal wavelength of the first-mode uplink optical signal of the coexisting risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode OLT (Optical Line Terminal) is less than a preset threshold.

[0035] In this embodiment, the first-standard ONU may include: an EPON (Ethernet Passive Optical Network) ONU or a 10G EPON (10Gigabit-capable Ethernet Passive Optical Network) ONU. The multi-standard OLT may include: a 50G PON (50Gigabit-capable Passive Optical Network) OLT. The first-standard uplink optical signal includes at least one of the following: an EPON uplink optical signal or a 10G EPON uplink optical signal. The second-standard downlink optical signal includes a 50G PON downlink optical signal.

[0036] In this embodiment, a passive optical network (PON) coexistence device is used. A splitter 11 receives a first-mode uplink optical signal from a first-mode ONU and splits it into a first-mode optical signal and a second-mode optical signal. The first-mode optical signal is then transmitted to the receiver 12, and the second-mode optical signal is transmitted to the coexistence risk screening module 13. The receiver 12 receives the first-mode optical signal and converts it into an electrical signal for output. The coexistence risk screening module 13 receives the second-mode optical signal and determines whether the first-mode ONU corresponding to the first-mode uplink optical signal is a coexistence risk ONU. The difference between the wavelength of the first-mode uplink optical signal of the risky ONU and the wavelength of the second-mode downlink optical signal of the multi-mode optical line terminal (OLT) is less than a preset threshold. Therefore, the receiver 12 of the PON coexistence device provided in this embodiment achieves normal service reception of the first-mode optical signal without causing normal service failures in the existing PON system. Furthermore, the coexistence risk screening module 13 of the passive optical network coexistence device provided in this application embodiment identifies the coexistence risk ONUs, enabling the processing of coexistence risk ONUs, such as replacing the coexistence risk ONUs or adding filters to the branch optical path where the coexistence risk ONUs are located, thereby avoiding the need to upgrade and replace all ONUs in the existing passive optical network system. This solves the coexistence problem of passive optical networks of different standards and the problem of resource waste.

[0037] In some embodiments, the coexistence risk screening module 13 includes a coexistence risk detection module 131 and a coexistence risk identification module 132.

[0038] The coexistence risk detection module 131 is used to receive the second branch optical signal and detect the signal parameter information of the second branch optical signal. The coexistence risk identification module 132 is used to obtain the signal parameter information of the target branch optical signal and determine whether the first type ONU is the coexistence risk ONU based on the signal parameter information.

[0039] In this embodiment, the target split optical signal may include: the second split optical signal, or the first split optical signal and the second split optical signal. That is, in one implementation, the coexistence risk identification module 132 in the coexistence risk screening module 13 can obtain the signal parameter information of the second split optical signal. This signal parameter information is detected by the coexistence risk detection module 131 in the coexistence risk screening module 13, thereby enabling the coexistence risk identification module 132 to determine whether the first type ONU is the coexistence risk ONU based on the signal parameter information of the second split optical signal.

[0040] In another implementation, the coexistence risk identification module 132 in the coexistence risk screening module 13 can obtain the signal parameter information of the first branch and the signal parameter information of the second branch optical signal. The signal parameter information of the first branch is detected by the receiver 12 mentioned above, and the signal parameter information of the second branch optical signal is detected by the coexistence risk detection module 131 in the coexistence risk screening module 13. Thus, the coexistence risk identification module 132 can determine whether the first type ONU is the coexistence risk ONU based on the signal parameter information of the first branch optical signal and the signal parameter information of the second branch optical signal.

[0041] In another implementation, the coexistence risk identification module 132 in the coexistence risk screening module 13 can obtain the signal parameter information of the first branch and the signal parameter information of the second branch optical signal. In this implementation, the coexistence risk identification module 132 can combine the above two implementations, that is, first judge the signal parameter information of the second branch optical signal and then judge based on the signal parameter information of the first branch optical signal and the signal parameter information of the second branch optical signal to determine whether the first type ONU is the coexistence risk ONU. This implementation can increase the accuracy of determining the coexistence risk ONU.

[0042] In some embodiments, FIG2 shows a schematic diagram of a passive optical network coexistence device provided in another embodiment of the present application. Referring to FIG2, the coexistence risk detection module 131 includes a wavelength screening filter 1311 and a detection unit 1312 connected to each other. The wavelength screening filter 1311 and the beam splitter 11 are connected.

[0043] In this embodiment, the wavelength filtering filter 1311 is used to filter the second branch optical signal of its branch optical path. For example, in time-division multiplexing mode or wavelength-division multiplexing mode, different conduction wavelength ranges and cutoff wavelength ranges are preset for the wavelength filtering filter 1311, thereby enabling or cutting off the second branch optical signal through the preset wavelength ranges. Then, the detection unit 1312 determines the coexistence risk ONU based on the filtered second branch optical signal.

[0044] In some embodiments, referring to FIG2, receiver 12 is a multi-system time-division multiplexing receiver, the target split optical signal includes a second split optical signal; wavelength filtering filter 1311 is used to receive the second split optical signal, and is turned on when the signal wavelength of the second split optical signal is within a first preset wavelength range, and is turned off when the signal wavelength of the second split optical signal is within a safe wavelength range.

[0045] The detection unit 1312 is used to detect the signal parameter information of the second split optical signal after passing through the wavelength filtering filter 1311; wherein, the signal parameter information of the second split optical signal includes the second signal power of the second split optical signal.

[0046] The coexistence risk identification module 132 is used to obtain the second signal power of the second branch optical signal; in response to the second signal power being greater than or equal to a preset power threshold, the first type ONU is determined to be the coexistence risk ONU.

[0047] In this embodiment, the first preset wavelength range includes a risk wavelength range and a buffer wavelength range; the risk wavelength range is the range of the operating wavelength of the coexisting risk ONU; the buffer wavelength range is located between the risk wavelength range and the safe wavelength range. For example, referring to Figure 3, Figure 3 shows a schematic diagram of the filtering loss curve of a wavelength screening filter provided in an embodiment of this application. In this embodiment, when the signal wavelength range of the 50G PON downlink optical signal is 1364-1368nm, the passband wavelength range of the wavelength screening filter in the coexisting risk screening module can be set to 1350-1360nm to screen out coexisting risk ONUs whose signal wavelengths have coexisting risks in the 1350-1360nm range.

[0048] Furthermore, the passband wavelength range of the wavelength screening filter can be set to >1348nm to improve the screening ratio of coexisting risk ONUs. The passband wavelength range of the wavelength screening filter can be set with a cutoff band (i.e., safe wavelength range) of 1260–1346nm, a transition band (i.e., buffer wavelength range) of 1346–1348nm, and a passband (i.e., risk wavelength range) greater than 1348nm. A transition band is set between the cutoff band and the transition band to serve as a replacement buffer for coexisting risk ONUs. In specific applications, the wavelength ranges of the passband, transition band, and cutoff band of the wavelength screening filter can be flexibly set and are not limited to the definitions in this embodiment.

[0049] In this embodiment, when the receiver 12 is a multi-standard time-division multiplexing receiver, the wavelength filtering filter 1311 receives the second split optical signal. Based on a preset first preset wavelength range and a safe wavelength range, it is turned on when the signal wavelength of the second split optical signal is within the first preset wavelength range and turned off when the signal wavelength of the second split optical signal is within the safe wavelength range. Thus, the second split optical signal with a signal wavelength within the first preset wavelength range can pass through the wavelength filtering filter 1311 to the detection unit 1312. The detection unit 1312 detects the signal parameter information of the second split optical signal after passing through the wavelength filtering filter 1311. In this embodiment, the signal parameter information of the second split optical signal includes the second signal power of the second split optical signal. The coexistence risk identification module 132 obtains the second signal power of the second split optical signal detected by the detection unit 1312, and compares the second signal power of the second split optical signal with a preset power threshold. Therefore, in response to the second signal power being greater than or equal to the preset power threshold, the first standard ONU is determined to be the coexistence risk ONU. In this embodiment, the coexistence risk identification module 132 can determine the coexistence risk ONU based on the signal parameter information of the acquired second branch optical signal.

[0050] In some embodiments, because the dynamic range requirement of the existing passive optical network (ODN) is 15dB, the receiving sensitivity of EPON and 10G EPON uplink optical signals can be as low as -30dBm, and the overload optical power can reach -6dBm. Under high light conditions, if the isolation between the passband and cutoff band of the wavelength filtering filter is insufficient, the signal power detected within the safe wavelength range may exceed a preset threshold, leading to false positives. Under low light conditions, if the detection sensitivity of the detection unit is not high enough, the signal power may not be detected within the risk wavelength range, leading to false negatives.

[0051] Based on the above problems, in some other embodiments, the target split optical signal includes the first split optical signal and the second split optical signal. That is, the coexistence risk identification module 132 of the coexistence risk screening module of the passive optical network coexistence device provided in this application determines whether the first type ONU is a coexistence risk ONU based on the first signal power of the first split optical signal and the second signal power of the second split optical signal. The receiver 12 is a multi-standard time-division multiplexing receiver used to detect the first signal power of the first split optical signal; the coexistence risk identification module 132 is used to acquire the first signal power of the first split optical signal and the second signal power of the second split optical signal, and determine whether the first type ONU is the coexistence risk ONU based on the difference or ratio between the first signal power and the second signal power.

[0052] In this embodiment, when the receiver 12 is a multi-mode time-division multiplexing receiver, the multi-mode time-division multiplexing receiver detects the first signal power of the first branch optical signal, and the coexistence risk identification module 132 obtains the second signal power of the second branch optical signal detected by the detection unit 1312 and the first signal power of the first branch optical signal detected by the multi-mode time-division multiplexing receiver. Based on the difference or ratio between the first signal power and the second signal power, it determines whether the first-mode ONU is a coexistence risk ONU. That is, in this embodiment, the coexistence risk identification module 132 can determine the coexistence risk ONU based on the obtained signal parameter information of the first branch optical signal and the signal parameter information of the second branch optical signal, thereby improving the accuracy of determining the coexistence risk ONU and solving the problems of false positives and false negatives.

[0053] In some embodiments, the wavelength range of the received optical signal of the multi-mode time-division multiplexing receiver can be 1260-1360nm. It can receive EPON and 10G EPON non-narrowing uplink optical signals in the range of 1260-1360nm, 10G EPON symmetrical uplink optical signals in the range of 1260-1280nm, and 50G PON uplink optical signals in the range of 1284-1288nm, and can be compatible with broadband EPON and 10GEPON asymmetric ONUs to the greatest extent.

[0054] When the wavelength range of the received optical signal of the multi-mode time-division multiplexing receiver is 1260-1360nm, the 1342nm downlink optical signal of 50G PON is reflected back to the multi-mode time-division multiplexing receiver by the ODN, causing uplink service anomalies. In this case, a new 50G PON wavelength needs to be selected, and considering reducing dispersion costs, it should be as close to 1360nm as possible, for example, 1364-1368nm. When the wavelength of the new 50G PON downlink optical signal is close to the wavelength of the EPON uplink optical signal, it may lead to degradation of the optical signal quality of the transmitter (FP laser) in the broadband EPON ONU, resulting in uplink packet loss or even disconnection.

[0055] In this embodiment, the coexistence risk screening module can pre-screen broadband EPON and 10G EPON asymmetric ONUs whose uplink optical signals are close to the downlink optical signals of the 50G PON, without affecting existing EPON and 10G EPON services, before the 50G PON service is launched. After the 50G PON service is launched, it can predict the coexistence risk ONUs online in real time, indicating that the EPON ONUs may exceed the risk value as the signal wavelength moves closer to the 50G PON as the ambient temperature rises.

[0056] In some embodiments, the coexistence risk identification module 132 may be used to: in response to the second signal power being greater than or equal to a preset power threshold, determine whether the first type ONU is the coexistence risk ONU based on the difference or ratio between the first signal power and the second signal power.

[0057] In this embodiment, the coexistence risk identification module 132, based on the first signal power of the acquired first branch optical signal and the second signal power of the second branch optical signal, combines the two methods for determining coexistence risk ONUs mentioned above. First, it judges whether the second signal power is a coexistence risk ONU based on a preset power threshold. If the second signal power is greater than or equal to the preset power threshold, it then determines whether the first type ONU is a coexistence risk ONU based on the difference or ratio between the first and second signal powers. By combining the two methods, the accuracy of determining coexistence risk ONUs is increased.

[0058] In some embodiments, regarding the determination of whether the first type ONU is the coexistence risk ONU based on the difference or ratio of the first signal power and the second signal power, the coexistence risk identification module 132 may specifically be used to: determine the first type ONU as the coexistence risk ONU in response to the absolute value of the power difference between the first signal power and the second signal power being less than or equal to a first difference threshold; or, determine the first type ONU as the coexistence risk ONU in response to the power ratio of the first signal power and the second signal power being less than or equal to a first ratio threshold; or, determine the first type ONU as the coexistence risk ONU in response to the power ratio of the second signal power and the first signal power being greater than a second ratio threshold.

[0059] In this embodiment, the coexistence risk identification module 132 determines the first type ONU as the coexistence risk ONU by comparing the absolute value of the power difference between the first signal power and the second signal power with a first difference threshold. If the absolute value of the power difference between the first signal power and the second signal power is less than or equal to the first difference threshold, the module identifies the first type ONU as the coexistence risk ONU. Alternatively, it determines the first type ONU as the coexistence risk ONU by comparing the power ratio of the first signal power and the second signal power with a first ratio threshold. Or, it determines the first type ONU as the coexistence risk ONU by comparing the power ratio of the second signal power and the first signal power with a second ratio threshold. If the power ratio of the second signal power and the first signal power is greater than the second ratio threshold, the module identifies the first type ONU as the coexistence risk ONU. Thus, the coexistence risk identification module 132 determines the coexistence risk ONU based on the first signal power of the first split optical signal and the second signal power of the second split optical signal.

[0060] In some embodiments, the coexistence risk identification module 132 can also be used to: after determining that the first type ONU is the coexistence risk ONU, determine that the first type uplink optical signal meets the preset risk conditions.

[0061] The preset risk conditions include packet loss and / or the presence of bit errors.

[0062] In this embodiment, after determining that the first-mode ONU is the coexistence risk ONU, a judgment is added regarding whether a preset risk condition is met. If the first-mode uplink optical signal meets the preset risk condition, the coexistence risk identification module 132 indicates that there is a wavelength coexistence risk. If the first-mode uplink optical signal does not meet the preset risk condition, the coexistence risk identification module 132 continues to acquire the second signal power of the second branch optical signal and continues to judge the coexistence risk based on the second signal power, or the first signal power and the second signal power, thereby further improving the accuracy of the judgment of the coexistence risk ONU.

[0063] In some embodiments, the receiver is a multi-standard time-division multiplexer, which includes a single receiver or multiple receivers.

[0064] In the case where the receiver includes a single receiver, the receiver is used to receive the first split optical signal in different time slots. The first split optical signal includes the first-mode uplink optical signal or the second-mode uplink optical signal, and the second-mode uplink optical signal is transmitted by the second-mode ONU.

[0065] Wherein, when the receiver includes multiple receivers, the receiver is used to receive the first split optical signal in different time slots, or the first split optical signal and the second split optical signal, wherein the first split optical signal includes the first type uplink optical signal, and the second split optical signal includes the second type uplink optical signal.

[0066] In some embodiments of this application, referring to FIG4a, FIG4a shows a schematic diagram of the structure of a passive optical network coexistence device provided in an embodiment of this application. In this embodiment, the receiver includes a single receiver, as shown in 1260-1360Rx in FIG4a. The receiver is used to receive the first split optical signal under different time slots. The first split optical signal includes a first-mode uplink optical signal or a second-mode uplink optical signal. That is, the splitter receives the first-mode uplink optical signal sent by the first-mode ONU and the second-mode uplink optical signal sent by the second-mode ONU, and splits the first-mode uplink optical signal and the second-mode uplink optical signal into a first split optical signal and a second split optical signal. When the receiver includes a single receiver, the splitter transmits the first split optical signal to the single receiver. The receiver receives uplink optical signals of different modes under different time slots in the first split optical signal, such as EPON uplink optical signal, 10GEPON uplink optical signal, and 50G PON uplink optical signal.

[0067] In some other embodiments of this application, see Figure 4b, which shows a schematic diagram of a passive optical network coexistence device provided in another embodiment of this application. In this embodiment, the receiver includes multiple receivers, which are located in the first splitting branch or the second splitting branch respectively. The number of receivers in each splitting branch can be adjusted in actual application and is not specifically limited here. The embodiment shown in Figure 4b uses two receivers as an example, as shown in Figure 4b (1260-1360Rx and 1284-1288Rx). The optical splitter transmits the first split optical signal to 1260-1360Rx, which receives the first split optical signal in different time slots. The optical splitter then transmits the second split optical signal to a wavelength filtering filter, which then transmits it to 1284-1288Rx. 1284-1288Rx receives the second split optical signal in different time slots. In other words, 1260-1360Rx can be used to receive the first-mode uplink optical signal in the 1260-1360nm range of the first split optical signal, such as EPON uplink optical signal or 10G EPON uplink optical signal. 1284-1288Rx can be used to receive the second-mode uplink optical signal in the 1284-1288nm range of the second split optical signal, such as 50G uplink optical signal. PON uplink optical signals can be received by different receivers of different standards, thereby reducing the reception range of each receiver.

[0068] In some embodiments, the detection unit 1312 includes a detector and a detection signal processing circuit. The detection signal processing circuit is configured to amplify the electrical signal output by the detector and output it to the coexistence risk identification module 132; or, to convert the electrical signal output by the detector into a level indication signal and output it to the coexistence risk identification module 132.

[0069] The detector may include a PD (Photo Detector), and the detection signal processing circuit may include an SD (Signal Detector) circuit and a burst power detection circuit, such as an RSSI (Received Signal Strength Indication) burst power detection circuit.

[0070] In this embodiment, the detector can be a PIN, APD, or SOA (Semiconductor Optical Amplifier) ​​+ PIN detector, etc. Considering the detection limit, an APD detector is preferred. The wavelength selection filter can be a TFF (Thin Film Filter), Z-block optical path, or waveguide filter, etc., and the beam splitter can be a partial reflector or a splitter device.

[0071] In this embodiment, the passive optical network (PON) coexistence device can determine whether a first-mode ONU is a coexistence risk ONU through a detector and a detection signal processing circuit. In one embodiment, the determination of a coexistence risk ONU is achieved through PD and SD detection circuits. When the signal wavelength of the first-mode uplink optical signal is within the safe wavelength range, the PD output signal amplitude is extremely low due to the cutoff of the wavelength filtering filter, and the SD detection circuit outputs a low level. When the signal wavelength of the first-mode uplink optical signal is within the risk wavelength range, the PD's normal output electrical signal exceeds the threshold due to the pass-through of the wavelength filtering filter, and the SD detection circuit outputs a high-level signal to the risk wavelength indication interface. Thus, the system device can identify the coexistence risk ONU through the high-low level transition of the risk wavelength indication interface.

[0072] In another embodiment, the coexistence risk ONU is determined through PD and RSSI burst power detection circuits. The optical module of the passive optical network system reads the RSSI optical power value of the first-mode uplink optical signal in different wavelength ranges and writes it into the corresponding register address of the optical module. The system device reads the RSSI optical power value of the first-mode uplink optical signal of the current first-mode ONU after passing through the wavelength screening filter through the I2C (Inter-Integrated Circuit) interface and compares it with the risk warning threshold. When the RSSI optical power value exceeds the threshold, the current first-mode ONU is determined to be a coexistence risk ONU.

[0073] Furthermore, the burst power detection circuit can also be implemented by a quasi-continuous detection circuit. In this case, the MAC (Media Access Control) of the system device needs to allocate a longer emission time slot to the uplink optical signal of the ONU to be detected in order to meet the detection time requirements of the quasi-continuous detection circuit.

[0074] In this embodiment, the passive optical network (PON) coexistence device can be applied to the PON coexistence system shown in Figure 5. Referring to Figure 5, which is a schematic diagram of a PON coexistence system provided in an embodiment of this application, it includes three generations of passive optical networks: EPON, 10G EPON, and 50GPON. The PON coexistence system includes an OLT, an ODN, and multiple ONUs. The optical modules in the OLT can adopt the PON coexistence device shown in Figure 4a or Figure 4b. In this system, the ONU can include at least one of the following: 50G PON ONU, 10G EPON narrowband ONU, EPON narrowband ONU, 10G EPON wideband ONU, EPON wideband ONU, and 10G EPON symmetrical ONU. It should be noted that Figure 5 exemplarily shows six types of ONUs; in practical applications, the number and type of ONUs connected in the PON coexistence system can be adjusted according to actual needs.

[0075] The passive optical network coexistence device provided in this application will be described in detail below with reference to the embodiments shown in Figures 4a and 4b.

[0076] As shown in Figure 4a, in this embodiment, the passive optical network coexistence device includes an EPON 1490 downlink transmitter (i.e., 1490Tx shown in Figure 4a), a 10G EPON 1577 downlink transmitter (i.e., 1577Tx shown in Figure 4a), a 50G PON 1366 downlink transmitter (i.e., 1366Tx shown in Figure 4a), a multi-standard time-division multiplexing receiver for receiving 1260–1360nm broadband signals (i.e., 1260–1360Rx shown in Figure 4a, meaning the passive optical network coexistence device in this embodiment includes a single receiver), a wavelength selection filter, a detection unit, an MCU (Micro Control Unit), a WDM (Wavelength Division Multiplexing) for each uplink and downlink wavelength channel, a 50G PON electrical signal processing chip, and EPON and 10G EPON electrical signal processing chips. The wavelength selection filter, detection unit, and MCU constitute a coexistence risk screening module.

[0077] The WDM (Wave DM) is a beam splitter equipped with an optical signal input interface. Electrical signal processing chips can be implemented using DSP (Digital Signal Processing), LA (Limited Amplifier), and LDD (Laser Driver) chips. The 50G PON electrical signal processing chip is equipped with a 50G PON electrical signal transmission interface, while the EPON and 10G EPON electrical signal processing chips are equipped with EPON and 10G EPON electrical signal transmission interfaces, respectively. A single multi-standard time-division multiplexed receiver incorporates a 1260-1360 filter, which may also include a time-division TIA (Transimpedance Amplifier). The wavelength screening filter and the detection unit constitute the coexistence risk detection module within the coexistence risk screening module. The detection unit is equipped with a risk wavelength indication interface and may include a detector and a detection signal processing circuit. The detection signal processing circuit amplifies or converts the electrical signal output by the detector into a level indication signal and outputs it to the risk wavelength indication interface. The MCU is equipped with an I2C interface, which is used to store the information output by the MCU in the register to realize the coexistence risk identification module.

[0078] In this embodiment, the splitting ratio of the optical splitter can be set to 90%:10%, 95%:5%, 50%:50%, etc., ensuring that the receiving sensitivity of the first split optical signal input to the multi-standard time-division multiplexing receiver meets the power budget level requirements of the ODN (Optical Distribution Network). In this embodiment, the coexistence risk identification module is implemented by an optical module, a system device MCU, a centralized processing unit, a software processing unit, or a network management platform.

[0079] In one implementation of this embodiment, using the passive optical network coexistence device shown in Figure 4a, the optical splitter can split the uplink optical signal according to a preset ratio of 90%:10%. 90% of the uplink optical signal is the first split signal, and 10% is the second split signal. 90% of the uplink optical signal enters a 1260-1360nm broadband time-division multiplexing receiver, and 10% enters a coexistence risk screening module composed of a wavelength filtering filter and a detection unit. The wavelength filtering filter filters the second split signal, and the detection unit detects the signal power of the second split signal that is activated by the wavelength filtering filter. Taking an MCU as an example, the MCU judges the signal power of the detected second split signal. If the signal power of the second split signal is greater than or equal to a preset power threshold, i.e., the signal wavelength of the second split signal is within the risk wavelength range, then the ONU currently transmitting the uplink optical signal is flagged as having a coexistence risk, and the ONU is determined to be a coexistence risk ONU.

[0080] In some embodiments, the preset power threshold can be set to -43dBm or other values. This preset power threshold can be adjusted based on the accuracy of the determination of the coexisting risk ONU.

[0081] Furthermore, after the coexistence risk screening module detects a coexistence risk ONU, it stores the coexistence risk information corresponding to the uplink optical signal of the coexistence risk ONU in a register. The coexistence risk information may include at least one of the following: relevant information about the coexistence risk ONU, the wavelength of the uplink optical signal transmitted by the coexistence risk ONU, and the risk level of the coexistence risk ONU. The system device can obtain the coexistence risk information by reading the register information through the I2C interface. Alternatively, after the coexistence risk screening module detects an uplink optical signal with a wavelength within the risk wavelength range, it can report the coexistence risk information to the system device where the passive optical network coexistence device is located through interfaces such as dedicated hardware pins.

[0082] In some embodiments, in a PON, 10G EPON and 50G PON coexisting OLT optical module, the optical path splitting of the coexistence risk screening module can be split from the WDM optical path input port, and the WDM device is included in the multi-standard time division multiplexing receiver.

[0083] In another implementation of this embodiment, based on the aforementioned issues of misjudgment and omission of coexistence risk ONUs, the passive optical network coexistence device shown in Figure 4a simultaneously detects the burst power P0 of the first branch optical signal in the multi-mode time division multiplexing receiver and the burst power P1 of the second branch optical signal in the coexistence risk screening module. After conversion according to the splitter splitting ratio R (e.g., 90%:10%), P0' and P1' are obtained. The optical power difference or ratio of P0' and P1' is calculated. When the optical power difference of P0' and P1' is less than a preset difference threshold, or the optical power ratio of P0' and P1' is less than a preset ratio threshold, it indicates that the ONU currently transmitting the uplink optical signal has a coexistence risk, and the coexistence risk ONU is identified.

[0084] In some embodiments, the difference threshold or ratio threshold may be set to 5 dB or other values. This difference threshold or ratio threshold setting can be adjusted based on the accuracy of determining the coexisting risk ONU.

[0085] In some embodiments, the system device can send an RSSI detection signal to the optical module. The optical module reads the RSSI optical power of the first branch optical signal of the multi-standard time division multiplexing receiver and the second branch optical signal of the coexistence risk screening module in real time and stores it in the optical module register. After reading the specific value through the register, the system device calculates the optical power difference or ratio according to the preset threshold of the system to determine whether the current ONU is a coexistence risk ONU.

[0086] In some embodiments, the optical module can set a risk threshold and report the optical power P0 and P1 of the first split optical signal and the second split optical signal to a register or a risk wavelength prompt hardware interface. The MCU of the optical module compares the detected difference or ratio of optical power P0' and P1' (which is calculated by converting P0 and P1 according to the split ratio) with the risk threshold. When the difference or ratio of optical power is less than the risk threshold, the MCU will report the coexistence risk information of the determined coexistence risk ONU to the register or the risk wavelength prompt hardware interface for alarm.

[0087] In another implementation of this embodiment, referring to FIG6, FIG6 shows a flowchart of a method for determining coexisting risk ONUs provided in an embodiment of this application. The determination of coexisting risk ONUs is achieved by combining the above two methods. The method for determining coexisting risk ONUs may include the following steps.

[0088] Step 601: The optical splitter of the passive optical network coexistence device receives the first uplink optical signal sent by the first type ONU and splits the first uplink optical signal into a first split optical signal and a second split optical signal.

[0089] The first type of ONU includes the aforementioned EPON ONU and 10G EPON ONU. The optical splitter sends the first split optical signal to the multi-standard time-division multiplexing receiver and sends the second split optical signal to the coexistence risk screening module.

[0090] Step 602: The multi-mode time-division multiplexing receiver receives and detects the first signal power of the first branch optical signal, and the coexistence risk screening module detects the second signal power of the second branch optical signal.

[0091] Step 603: The coexistence risk screening module determines whether the power of the second signal is greater than or equal to a preset power threshold. If yes, proceed to step 604. If no, return to step 602.

[0092] Step 604: The coexistence risk screening module determines whether the difference between the first signal power and the second signal power is less than or equal to a difference threshold, or whether the ratio of the first signal power and the second signal power is less than or equal to a ratio threshold. If yes, proceed to step 605. If no, return to step 602.

[0093] Step 605: Determine the first type ONU as a coexisting risk ONU.

[0094] By combining the two methods for determining coexisting risk ONUs mentioned above through the embodiments of this application, namely, first judging the second signal power of the second branch optical signal and then judging based on the first signal power of the first branch optical signal and the second signal power of the second branch optical signal, the accuracy of determining coexisting risk ONUs is further improved.

[0095] As shown in Figure 4b, in this embodiment, unlike the passive optical network coexistence device shown in Figure 4a, the passive optical network coexistence device includes two receivers: a first receiver (1260-1360Rx shown in Figure 4b) and a second receiver (1284-1288Rx shown in Figure 4b). The first receiver receives the first-mode uplink optical signal from the first split optical signal, which may include EPON and 10G EPON uplink optical signals in the 1260-1360 range. The second receiver is located in the reflection or transmission optical path of the wavelength selection filter and receives the second-mode optical signal from the second split optical signal. Other components of this passive optical network coexistence device can be found in the relevant descriptions in Figure 4a.

[0096] In some embodiments, the first receiver and the second receiver in the above-described passive optical network coexistence device can be located in different splitting branches of the optical splitter, respectively receiving the first split optical signal and the second split optical signal. The first receiver and the second receiver can also be located simultaneously in the same splitting branch of the optical splitter. The first receiver and the second receiver can be connected to the first-stage optical splitter via a second-stage optical splitter. That is, the optical splitter can include both a first-stage and a second-stage optical splitter. The first-stage optical splitter splits the received uplink optical signals of different standards into two optical signals in two splitting branches. In one of the splitting branches, the second-stage optical splitter can also transmit the optical signal of that branch optical path to the receiver of that branch optical path.

[0097] In the embodiments of this application, the splitting ratio of the beam splitter can be set to a ratio of 50%:50%, 40%:60%, etc., and it is necessary to ensure that the receiving sensitivity of each receiver simultaneously meets the ODN power budget level requirements.

[0098] In this embodiment of the application, two receivers located in different optical splitting branches in the passive optical network coexistence device receive a first-mode uplink optical signal from the first split optical signal and a second-mode uplink optical signal from the second split optical signal, respectively. The first-mode uplink optical signal includes EPON uplink optical signal and 10G EPON uplink optical signal, and the second-mode uplink optical signal includes 50G PON uplink optical signal. This can reduce the operating rate range of each receiver, thereby reducing the implementation difficulty of receivers corresponding to different modes.

[0099] In this embodiment, the first-mode uplink optical signal in the first split optical signal enters the first receiver, where the signal power of the first-mode uplink optical signal is detected. The first-mode optical signal and the second-mode uplink optical signal in the second split optical signal enter a wavelength filtering filter. The wavelength filtering filter transmits the activated first-mode uplink optical signal to a detection unit, where the detection unit detects the signal power of the first-mode uplink optical signal. The wavelength filtering filter then transmits the activated second-mode uplink optical signal to a second receiver, which converts the second-mode uplink optical signal into an electrical signal and transmits it to a second-mode electrical signal processing chip. The coexistence risk identification module, such as an MCU, judges the signal power of the detected second branch optical signal and / or the signal power of the first branch optical signal. If (1) the signal power of the second branch optical signal is greater than or equal to a preset power threshold; (2) the difference between the signal power of the first branch optical signal and the signal power of the second branch optical signal is less than or equal to a difference threshold; or (3) the ratio of the signal power of the first branch optical signal to the signal power of the second branch optical signal is less than or equal to a ratio threshold, then the first type ONU is determined to be a coexistence risk ONU. Thus, the passive optical network coexistence device provided in this application embodiment can also simultaneously identify coexistence risk ONUs.

[0100] Figure 7 shows a schematic diagram of the optical path of the optical components of a passive optical network coexistence device according to an embodiment of this application. Referring to Figure 7, the optical path of the optical components includes a beam splitter 701, an uplink / downlink multiplexing / demultiplexing filter 702, a reflector 703, a multi-mode time-division multiplexing receiving broadband filter 704, a multi-mode time-division multiplexing APD (Avalanche Photodiode), a wavelength selection filter 705, a wavelength selection detection APD, and a downlink transmitter. The beam splitter 701 reflects 10% of the uplink optical signal to the wavelength selection filter 705 and the wavelength selection detection APD. 90% of the uplink optical signal is transmitted to the uplink / downlink multiplexing / demultiplexing filter 702, and then reflected by the uplink / downlink multiplexing / demultiplexing filter 702 to the reflector 703, and then reflected by the reflector 703 to the multi-mode time-division multiplexing receiving broadband filter 704 and the multi-mode time-division multiplexing APD for reception. The downlink optical signal transmitted by the downlink transmitter is transmitted through the uplink and downlink multiplexing / splitting filter 702 and then through the beam splitter 701 to the optical port (i.e., the optical signal input interface configured on the WDM) for output.

[0101] Furthermore, the circuit structure of the wavelength selection detection APD in this embodiment is shown in Figure 8, including a wavelength selection detection APD ROSA (Receiver Optical Sub-Assembly) (including TIA), an RSSI detection chip, and an MCU. After receiving the trigger signal sent by the MCU, the RSSI detection chip obtains the amplitude of the burst optical signal input to the APD ROSA by detecting the magnitude of the APD mirror current and the sample-and-hold circuit, and sends it to the MCU through the ADC (Analog-to-digital converter) interface on the RSSI detection chip. The MCU then analyzes the specific value of the optical signal power. The trigger signal can be sent from the system device to the MCU via a dedicated pin, and then from the MCU to the RSSI detection chip.

[0102] In some embodiments, since the detection limit of the optical component's optical path is much smaller than that of a normal PON service signal, a high-sensitivity APD can be selected or the mirror current terminal resistance can be increased to improve the detection limit of the wavelength screening optical path, thereby increasing the output amplitude of the small signal. The wavelength screening detection APD can also employ a burst power detection circuit. In other embodiments, an RSSI detection circuit and a burst power detection circuit can be used in combination.

[0103] In the embodiments of this application, the receiver may include a multi-standard time-division multiplexing receiver or a multi-standard wavelength-division multiplexing receiver. The embodiments in Figures 3 to 8 above have been described using a multi-standard time-division multiplexing receiver as an example. The following description will also use a multi-standard wavelength-division multiplexing receiver as an example.

[0104] Figure 9 shows a schematic diagram of a passive optical network coexistence device according to another embodiment of this application. Referring to Figure 9, the passive optical network coexistence device 900 includes a beam splitter 91, a receiver 92, and a coexistence risk screening module 93. The coexistence risk screening module 93 includes a coexistence risk detection module 931 and a coexistence risk identification module 932. The coexistence risk detection module 931 includes a wavelength screening filter 9311 and a detection unit 9312 connected to each other. The wavelength screening filter 9311 is connected to the beam splitter 91.

[0105] The optical splitter 91 receives the first uplink optical signal sent by the first type ONU, divides the first uplink optical signal into a first split optical signal and a second split optical signal, transmits the first split optical signal to the receiver 92, and transmits the second split optical signal to the coexistence risk screening module 93.

[0106] In this embodiment, the splitting ratio of the beam splitter 91 can be set to 50%:50%, 60%:40%, etc., to ensure that the receiving sensitivity of the first split optical signal input receiver 92 and the receiving sensitivity of the second split optical signal input coexistence risk screening module 93 meet the power budget level requirements of the ODN.

[0107] The receiver 92 is a multi-mode wavelength division multiplexing receiver, used to detect the first signal power of the first split optical signal.

[0108] The wavelength filtering filter 9311 is used to receive the second split optical signal, and is turned on when the signal wavelength of the second split optical signal is within a second preset wavelength range, and is turned off when the signal wavelength of the second split optical signal is outside the second preset wavelength range; wherein, the second preset wavelength range is a broadband wavelength range.

[0109] The detection unit 9312 is used to detect the signal parameter information of the second split optical signal after passing through the wavelength filtering filter 9311; wherein, the signal parameter information of the second split optical signal includes the second signal power of the second split optical signal.

[0110] The coexistence risk identification module 932 is further configured to acquire the first signal power of the first branch optical signal and the second signal power of the second branch optical signal, and determine the first type ONU as the coexistence risk ONU based on the first signal power and the second signal power.

[0111] In this embodiment, when the receiver 92 is a multi-mode wavelength division multiplexing receiver, the wavelength filtering filter 9311 filters the received second-splitter optical signal by turning it on when the signal wavelength of the second-splitter optical signal is within a second preset wavelength range, and turning it off when the signal wavelength of the second-splitter optical signal is outside the second preset wavelength range. In this embodiment, the second preset wavelength range is a broadband wavelength range. Therefore, the second-splitter optical signal with a signal wavelength within the second preset wavelength range can pass through the wavelength filtering filter 9311 to the detection unit 9312. The detection unit 9312 detects the signal parameter information of the second-splitter optical signal after passing through the wavelength filtering filter 9311, such as the second signal power of the second-splitter optical signal. The coexistence risk identification module 932 determines the first type ONU as the coexistence risk ONU based on the first signal power of the first branch optical signal and the second signal power of the second branch optical signal. This allows the module to process the coexistence risk ONU and avoid upgrading and replacing all ONUs in the existing passive optical network system. This solves the coexistence problem of passive optical networks of different types and the problem of resource waste.

[0112] In some embodiments, the coexistence risk identification module 932 may be used to: determine that the first type ONU is the coexistence risk ONU in response to the absolute value of the power difference between the second signal power and the first signal power being greater than or equal to a second difference threshold, or in response to the power ratio between the second signal power and the first signal power being greater than or equal to a third ratio threshold, or in response to the power ratio between the first signal power and the second signal power being less than a fourth ratio threshold, and determine that the PON type of the coexistence risk ONU is EPON broadband or 10G EPON broadband.

[0113] In this embodiment, the coexistence risk identification module 932 compares the absolute value of the power difference between the second signal power of the second branch optical signal and the first signal power of the first branch optical signal with a second difference threshold, or compares the power ratio of the second signal power and the first signal power with a third ratio threshold, or compares the power ratio of the first signal power and the second signal power with a fourth ratio threshold. If the absolute value of the power difference between the second signal power and the first signal power is greater than or equal to the second difference threshold, or the power ratio of the second signal power and the first signal power is greater than or equal to the third ratio threshold, or the power ratio of the first signal power and the second signal power is less than the fourth ratio threshold, the first type ONU can be determined as a coexistence risk ONU, and the PON type of the coexistence risk ONU is determined to be EPON broadband standard or 10G EPON broadband standard. In this way, by replacing the coexistence risk ONU, the conflict of signal wavelengths of different passive optical networks can be resolved.

[0114] In some embodiments, the multi-mode wavelength division multiplexing receiver includes a multi-channel wavelength division multiplexing optical path and multiple receivers.

[0115] The multi-channel wavelength division multiplexing optical path is used to receive the first split optical signal in different wavelength ranges and send the first split optical signal to each of the receivers; each of the receivers is used to receive the first split optical signal in different wavelength ranges sent by the multi-channel wavelength division multiplexing optical path.

[0116] In this embodiment of the application, referring to Figure 10, a schematic diagram of a passive optical network coexistence device provided in another embodiment of the application is shown. The wavelength division multiplexing (WDM) receiver in this passive optical network coexistence device consists of a multi-channel WDM optical path and multiple receivers, namely WDM2, 1260–1280 Rx, 1284–1288 Rx, and 1290–1330 Rx. The WDM receiver, composed of a multi-channel WDM optical path and multiple receivers, receives the first split optical signals transmitted by ONUs of different standards corresponding to different wavelength ranges and converts them into electrical signals for output, thereby realizing the reception of normal services.

[0117] In some embodiments, the coexistence risk screening module is further configured to convert the second split optical signal into an electrical signal for output; wherein the signal wavelength of the second split optical signal is a broadband standard.

[0118] In this embodiment of the application, referring to Figure 10, the coexistence risk screening module can also be equipped with the function of converting the uplink optical signal sent by the received low-rate EPON non-narrowing ONU into an electrical signal for output, so that the branch optical path where the coexistence risk screening module is located can also achieve normal service reception.

[0119] In the embodiment shown in Figure 10, the passive optical network coexistence device can be applied to the passive optical network coexistence system shown in Figure 11. Referring to Figure 11, another embodiment of the passive optical network coexistence system provided in this application is shown, which includes three generations of passive optical networks: EPON, 10G EPON, and 50G PON. In this system, the ONU may include at least one of the following: EPON non-narrowing ONU, 10G EPON asymmetric ONU, 50G PON ONU, and 10G EPON asymmetric ONU. It should be noted that Figure 11 exemplarily shows four types of ONUs; in practical applications, the number and type of ONUs connected in the passive optical network coexistence system can be adjusted according to actual needs.

[0120] Referring to Figure 10, the passive optical network coexistence device includes an EPON 1490 downlink transmitter (i.e., 1490Tx shown in Figure 10), a 10G EPON 1577 downlink transmitter (i.e., 1577Tx shown in Figure 10), a 50G PON 1342 downlink transmitter (i.e., 1342Tx shown in Figure 10), a 1260–1280nm receiver (i.e., 1260–1280Rx shown in Figure 10, including a filter, APD, and TIA), a 1284–1288nm receiver (i.e., 1284–1288Rx shown in Figure 10, including a filter, APD, and TIA), a 1290–1330nm receiver (i.e., 1290–1330Rx shown in Figure 10, including a filter, APD, and TIA), a 1260–1360nm Rx, and a 1260–1360nm Rx. Rx includes a 1260–1360 nm passband wavelength screening filter, a detection unit, uplink and downlink wavelength channel multiplexers / demultiplexers WDM1 and WDM2, and electrical signal processing chips for various signal standards. The coexistence risk screening module includes the 1260–1360 nm wavelength screening filter, the detection unit, and an MCU. The wavelength screening filter and the detection unit constitute the coexistence risk detection module within the coexistence risk screening module, while the MCU is used to implement the coexistence risk identification module.

[0121] In this embodiment, the splitting ratio of the optical splitter can be set to 50%:50%, 60%:40%, etc., and it is necessary to ensure that the receiving sensitivity of the first split optical signal input to the multi-mode wavelength division multiplexing receiver meets the ODN power budget level requirements.

[0122] In this embodiment, the coexistence risk identification module can be implemented by an optical module, a system device MCU, a centralized processing unit, a software processing unit, or a network management platform.

[0123] In one implementation of this embodiment, using the passive optical network coexistence device shown in Figure 10, the optical splitter can split the uplink optical signal in equal proportions of 50%:50% and 60%:40%, respectively, transmitting the first split optical signal to a multi-mode wavelength division multiplexing receiver and the second split optical signal to a coexistence risk screening module. The 1260-1360nm passband wavelength filtering filter of the coexistence risk screening module filters out the second split optical signal within the 1260-1360nm signal wavelength range, and the detection unit detects the second signal power of the second split optical signal after passing through the wavelength filtering filter. The MCU, acting as the coexistence risk identification module, acquires the second signal power and the first signal power of the first split optical signal detected by the multi-mode wavelength division multiplexing receiver, and determines whether the ONU currently transmitting the uplink optical signal is a coexistence risk ONU based on the power difference or power ratio between the second and first signal powers. If the power difference between the second signal power and the first signal power of the first branch optical signal in the 1290-1330nm signal wavelength range is greater than or equal to a preset difference threshold, or the power ratio is greater than or equal to a preset ratio threshold, and / or if the power difference between the second signal power and the first signal power of the first branch optical signal in the 1260-1280nm signal wavelength range is greater than or equal to a preset difference threshold, or the power ratio is greater than or equal to a preset ratio threshold, the ONU currently transmitting the uplink optical signal is determined to be a coexistence risk ONU, and the current ONU is prompted to use a broadband FP laser.

[0124] In another implementation of this embodiment, for EPON and 10G EPON standard ONUs, when the difference or ratio between the optical power value detected by the wavelength selection module and the optical power detected in the 1290-1330nm range of the multi-standard wavelength division multiplexing receiver is less than a preset threshold, the current ONU is determined to be an EPON narrowband standard ONU. When the difference between the optical power value detected by the wavelength selection module and the optical power detected in the 1260-1280nm range of the multi-standard wavelength division multiplexing receiver is less than a preset difference threshold or the ratio is less than a preset ratio threshold, the current ONU is determined to be a narrowband standard ONU.

[0125] The optical power values ​​compared above are proportionally converted values. For example, when the splitting ratio is 50%:50%, the optical power being compared is the original optical power. When the splitting ratio is 60%:40%, the optical power of the first split optical signal is converted to a 4 / 6 ratio before being compared with the optical power of the second split optical signal.

[0126] Furthermore, the scaling factor can also be considered in the scaling threshold, in which case the original optical power does not need to be recalculated. In the embodiments of this application, a power scaling threshold can be set to 1, and a power difference threshold can be set to 0 dBm. The total optical power value detected by the wavelength selection module is greater than the optical power difference detected by the 1290-1330nm multi-mode wavelength division multiplexing receiver. In actual use, the accuracy of the splitting ratio and the difference in filter loss can be considered and appropriate adjustments can be made. For example, the power scaling threshold can be adjusted to 1.1, and the difference threshold can be adjusted to 0.5 dBm. For wavelength division coexistence optical modules, the wavelength selection module of the passive optical network coexistence device provided in the embodiments of this application avoids the use of multi-channel wavelength division multiplexing devices (such as cascaded micro-ring resonators, arrayed waveguide gratings, etc.) and multiple PD detectors to scan the entire spectrum, which reduces costs and improves detection efficiency.

[0127] Furthermore, to ensure that existing EPON and 10GEPON services are not affected after the passive optical network upgrade and before the coexistence risk ONUs are screened and modified, the coexistence risk screening module must also have the function of receiving uplink optical signals from low-rate broadband ONUs and converting them into electrical signals for output. This can be achieved in the following way.

[0128] (1) Replace the optical modules in the existing network with the passive optical network coexistence device provided in this application embodiment. The system equipment uses the coexistence risk screening module in the passive optical network coexistence device to receive the uplink optical signals sent by the EPON broadband and 10G EPON asymmetric ONU, and converts them into electrical signals to output to the uplink service processing module, while keeping the 50G PON downlink transmission off.

[0129] (2) Based on the passive optical network coexistence method provided in this application, the ONUs with coexistence risks are screened out and modified. The modification method includes replacing the ONUs with coexistence risks or adding a filter in front of the ONUs with coexistence risks to filter out some wavelengths that cause coexistence risks.

[0130] (3) The uplink optical signal transmitted by the EPON and 10G EPON asymmetric ONU is received by the receiver of the corresponding wavelength range in the multi-mode wavelength division multiplexing receiver and converted into an electrical signal. The electrical signal is then output to the uplink service processing module to enable 50G PON service.

[0131] Through the above implementation method, the existing network can be upgraded to tri-mode coexistence, and it can be ensured that the uplink services of EPON and 10G EPON are normal after the network is upgraded to tri-mode and before the coexistence risk ONU is modified. After the coexistence risk ONU is modified, the 50G PON service is normally activated, and there is no need to replace the optical modules of the existing network again, that is, no secondary cutover is required. In the embodiment of this application, by replacing the coexistence risk ONU and using a multi-standard wavelength division multiplexing receiver, the 50G PON downlink wavelength of 1342nm no longer conflicts with the uplink wavelength of EPON and 10G EPON, and the passive optical network coexistence device (i.e., optical module) can use the standard 50G PON downlink wavelength of 1342nm.

[0132] In some embodiments, when the uplink optical signal of a broadband ONU is located near 1310nm, its main spectral energy is distributed in the wavelength range of 1290–1330nm. The power difference or power ratio between the signal power detected by the coexistence risk screening module and the signal power detected by the multi-mode wavelength division multiplexing (WDM) 1290–1330nm receiver will be less than a preset threshold. In this case, it is determined that the broadband ONU is not a coexistence risk ONU. Furthermore, since the main spectral energy is distributed in the wavelength range of 1290–1330nm, it can be ensured that the uplink reception performance of the 1290–1330nm receiver is not affected. After the 50G PON service is successfully activated, as the ambient temperature of the ONU changes, the wavelength of the broadband ONU gradually drifts outside the 1290-1330nm passband. At this time, the power difference or power ratio between the signal power detected by the coexistence risk screening module and the signal power detected by the multi-mode wavelength division multiplexing 1290-1330nm receiver will gradually approach the risk threshold. At this point, the passive optical network coexistence device determines that the broadband ONU is a coexistence risk ONU and can issue a warning to the system equipment. In this embodiment, similar to the above embodiments, when the passive optical network coexistence device issues a warning message to the system equipment, it can report it through the I2C interface, optical module hardware interface, optical module register, etc.

[0133] Furthermore, when EPON, 10G EPON, and 50G PON coexist in third-generation passive optical networks, the second branch optical signal of the coexistence risk screening module can be split from the WDM1 optical path input port. That is, the second branch optical signal is transmitted to WDM2 and enters the multi-standard wavelength division multiplexing receiver, while the first branch optical signal is transmitted to the wavelength selection filter and detection unit. In this embodiment, the detection unit of the coexistence risk screening module also has the ability to convert the second branch optical signal into an electrical signal and output it to the LA chip for processing, so as to ensure that the service reception of the branch optical path where the coexistence risk screening module is located is normal in the initial stage of deployment of the passive optical network coexistence device.

[0134] In some embodiments, the EPON electrical signal processing chip, such as LA, also has an electrical signal routing function, which can select different input electrical signal channels to output to the EPON output point interface in different deployment stages of the passive optical network coexistence device.

[0135] In the passive optical network coexistence system provided in this application embodiment, when three generations of passive optical networks coexist, the non-narrowing EPON and 10GEPON asymmetric ONUs typically use broadband FP lasers 1260, which conflict with the wavelengths of 50G PON and 10G EPON asymmetric networks, affecting 50G PON uplink services. The passive optical network coexistence device provided in this application embodiment identifies ONUs with coexistence risks by screening out those using broadband FP (Fabry-Perot) lasers with wavelength conflicts. This allows for the handling of ONUs with coexistence risks, avoiding the need to upgrade and replace all ONUs in the existing passive optical network system. This solves the problem of coexistence between different passive optical network standards and the problem of resource waste.

[0136] It should be noted that the structure of the above-described passive optical network coexistence device is an exemplary embodiment of this application. In practical applications, the passive optical network coexistence device can also add a low-speed EPON or 10G EPON asymmetric 1.25G electrical port to the MAC processing chip of the system equipment, so that the system equipment controls the signal selection at different deployment stages. In this case, the EPON electrical signal processing chip may not have signal selection output capability. In some embodiments, in the passive optical network coexistence device shown in FIG10, the 1260-1280nm receiver and the 1290-1330nm receiver can also be combined into a 1260-1280nm & 1290-1330nm receiver. In this case, EPON and 10G EPON can maintain the existing time division multiplexing mode, while EPON and 10G EPON still adopt wavelength division multiplexing mode with 50G PON, thereby reusing the existing EPON and 10G EPON electrical signal processing chips. Based on this structure, when the power difference or power ratio between the signal power detected by the coexistence risk screening module and the signal power detected by the merged 1260-1280nm & 1290-1330nm receivers is less than the risk threshold, it can be determined that the current EPON and 10G EPON ONUs are coexistence risk ONUs.

[0137] Based on the passive optical network coexistence device shown in Figure 10, Figure 12 shows a schematic diagram of the optical component optical path of another embodiment of the passive optical network coexistence device provided in this application. Referring to Figure 12, the passive optical network coexistence device includes 1290-1330nm Rx, 1260-1280nm Rx, 1284-1288nm Rx, and 1260-1360nm Rx as shown in the upper half of Figure 12, wherein the receiver is attached with a beam splitter 1201 for transmitting the first split optical signal to 1290-1330nm Rx, 1260-1280nm Rx, and 1284-1288nm Rx, and transmitting the second split optical signal to 1260-1360nm Rx. It also includes 1342Tx, 1577Tx, and 1490Tx as shown in the lower half of Figure 12. Taking the Z-block optical path as an example of wavelength filter selection, a semi-transparent and semi-reflective film is pasted on the Z-block substrate shown in Figure 12.

[0138] The detectors in the coexistence risk screening module can be PIN, APD, or SOA+PIN detectors, with APD detectors being preferred due to the sensitivity requirements of uplink services. Wavelength filtering filters can be TFF, Z-block optical paths, or waveguide filters, and beam splitters can be partial reflectors or splitter devices, depending on the implementation method of the optical components.

[0139] This application also provides a passive optical network coexistence system. Figure 13a shows a schematic diagram of the passive optical network coexistence system provided in one embodiment of this application. Referring to Figure 13a, the passive optical network coexistence system 1300 includes: a multi-standard OLT 1301, an optical distribution network (ODN) 1302, and a first-standard ONU 1303; the multi-standard OLT 1301 and the first-standard ONU 1303 are connected through the ODN 1302; the multi-standard OLT 1301 is configured with the passive optical network coexistence device described in any of the above embodiments.

[0140] Wherein, the first type ONU 1303 is used to send a first type uplink optical signal to the multi-type OLT 1301; the multi-type OLT 1301 is used to determine whether the first type ONU 1303 corresponding to the first type uplink optical signal is a coexistence risk ONU through the passive optical network coexistence device; wherein, the difference between the signal wavelength of the first type uplink optical signal of the coexistence risk ONU and the signal wavelength of the second type downlink optical signal of the multi-type OLT is less than a preset threshold.

[0141] In this embodiment, a passive optical network coexistence device configured in a multi-standard OLT can identify ONUs with coexistence risks from the first-standard ONUs transmitting uplink optical signals of the first standard. This allows for the handling of these risky ONUs, avoiding the need to upgrade or replace all ONUs in the existing passive optical network system. Specific implementation details of this passive optical network coexistence device can be found in the detailed descriptions of the above embodiments, and will not be repeated here.

[0142] In some embodiments, referring to FIG13b, FIG13b shows a schematic diagram of a passive optical network coexistence system provided in another embodiment of the present application. The passive optical network coexistence system 1300 may further include a second type ONU 1304; the multi-type OLT 1301 is connected to the first type ONU 1303 and the second type ONU 1304 through the ODN 1302.

[0143] The second-mode ONU 1304 is used to send a second-mode uplink optical signal to the multi-mode OLT 1301; the multi-mode OLT 1301 is also used to receive the second-mode uplink optical signal through the passive optical network coexistence device.

[0144] In this embodiment, the multi-standard OLT receives a first-standard uplink optical signal sent by a first-standard ONU and a second-standard uplink optical signal sent by a second-standard ONU through a passive optical network coexistence device. The receiver in the passive optical network coexistence device may include a single receiver (see the embodiment shown in FIG4a) or multiple receivers (see the embodiments shown in FIG4b and FIG10), which respectively receive uplink optical signals of different standards in different branch optical paths, such as EPON uplink optical signals, 10G EPON uplink optical signals, and 50G PON uplink optical signals, so as to enable the receiver to normally receive uplink services corresponding to different standards and to identify ONUs with coexistence risks.

[0145] This application also provides a passive optical network coexistence method. Figure 14 shows a flowchart of a passive optical network coexistence method provided in an embodiment of this application. The passive optical network coexistence method can be implemented by any of the passive optical network coexistence devices provided in the above embodiments. Referring to Figure 14, the passive optical network coexistence method may include the following steps.

[0146] Step 1402: Receive the first uplink optical signal sent by the first type ONU, and divide the first uplink optical signal into a first branch optical signal and a second branch optical signal.

[0147] Step 1404: Convert the first split optical signal into an electrical signal for output.

[0148] Step 1406: Determine whether the first type ONU is a coexistence risk ONU based on the target split optical signal.

[0149] The target split optical signal includes: the second split optical signal, or the first split optical signal and the second split optical signal; the difference between the signal wavelength of the first-mode uplink optical signal of the coexisting risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode OLT is less than a preset threshold.

[0150] In this embodiment, by receiving the first-mode uplink optical signal sent by the first-mode ONU, the first-mode uplink optical signal is divided into a first-mode split optical signal and a second-mode split optical signal. For the first-mode split optical signal, it can be converted into an electrical signal for output to ensure the normal reception of services on the existing network. For the second-mode split optical signal, it can be determined whether the first-mode ONU is a coexistence risk ONU based on the target split optical signal. The difference between the signal wavelength of the first-mode uplink optical signal of the coexistence risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode OLT is less than a preset threshold, thus realizing the coexistence of multi-mode passive optical networks while minimizing the waste of existing network resources.

[0151] In some embodiments, the above-described passive optical network coexistence method may further include: receiving a second-mode uplink optical signal sent by a second-mode ONU, and dividing the first-mode uplink optical signal and the second-mode uplink optical signal into a first-splitter optical signal and a second-splitter optical signal.

[0152] In this embodiment of the passive optical network (PON) coexistence device, the receiver located in the first optical branch can receive the second-mode uplink optical signal from the first split optical signal, or the receiver located in the second branch optical signal can receive the second-mode uplink optical signal from the second split optical signal, and convert the second-mode uplink optical signal into an electrical signal for output. For details, please refer to the embodiments shown in Figures 4a, 4b, and 10 above. It should be noted that receivers located in different branch optical paths in the PON coexistence device can receive uplink optical signals of different modes from different branch optical paths, such as EPON uplink optical signals, 10G EPON uplink optical signals, and 50G PON uplink optical signals, thereby enabling the receiver to normally receive uplink services corresponding to different modes and to identify ONUs with coexistence risks.

[0153] In some embodiments, when the target split optical signal includes the second split optical signal, step 1406 above, which determines whether the first type ONU is a coexistence risk ONU based on the target split optical signal, may include: step 1406a obtaining the second signal power of the second split optical signal; step 1406b, in response to the second signal power being greater than or equal to a preset power threshold, determining that the first type ONU is the coexistence risk ONU.

[0154] In this embodiment of the application, by comparing the second signal power of the second branch optical signal with a preset power threshold, the coexistence risk ONU can be determined.

[0155] In some embodiments, when the target split optical signal includes a first split optical signal and a second split optical signal, step 1406 above, which determines whether the first type ONU is a coexistence risk ONU based on the target split optical signal, may include: step 1406c, obtaining the first signal power of the first split optical signal and the second signal power of the second split optical signal; step 1406d, determining whether the first type ONU is a coexistence risk ONU based on the difference or ratio between the first signal power and the second signal power.

[0156] In some embodiments, determining whether the first type ONU is a coexistence risk ONU based on the difference or ratio of the first signal power and the second signal power may include: determining the first type ONU as the coexistence risk ONU in response to the absolute value of the power difference between the first signal power and the second signal power being less than or equal to a first difference threshold; or, determining the first type ONU as the coexistence risk ONU in response to the power ratio of the first signal power and the second signal power being less than or equal to a first ratio threshold; or, determining the first type ONU as the coexistence risk ONU in response to the power ratio of the second signal power and the first signal power being greater than a second ratio threshold.

[0157] In this embodiment of the application, by judging the difference or ratio between the second signal power of the second branch optical signal and the first signal power of the first branch optical signal, the coexistence risk ONU can be determined.

[0158] In some embodiments, the passive optical network coexistence method described above may further include: in response to the second signal power being greater than or equal to a preset power threshold, determining whether the first type ONU is the coexistence risk ONU based on the difference or ratio between the first signal power and the second signal power.

[0159] In this embodiment of the application, by combining the above two methods for determining the coexistence risk ONU, the second signal power of the second branch optical signal is first compared with a preset power threshold. If the second signal power is greater than or equal to the preset power threshold, the difference or ratio between the second signal power of the second branch optical signal and the first signal power of the first branch optical signal is judged to determine the coexistence risk ONU, thereby improving the accuracy of determining the coexistence risk ONU.

[0160] In some embodiments, after determining that the first type ONU is the coexisting risk ONU, the method further includes: determining that the first type uplink optical signal meets a preset risk condition.

[0161] The preset risk conditions include packet loss and / or the presence of bit errors.

[0162] In this embodiment of the application, by adding a judgment on whether the preset risk conditions are met after determining that the first type ONU is the coexisting risk ONU, the accuracy of determining the coexisting risk ONU can be further improved.

[0163] In some embodiments, after determining the first type ONU as the coexistence risk ONU as described above, the passive optical network coexistence method may further include: replacing the coexistence risk ONU; or, adding a filter to the branch optical path where the coexistence risk ONU is located.

[0164] Through the embodiments of this application, coexistence risk ONUs are screened out, and corresponding measures are taken for coexistence risk ONUs, such as replacing the coexistence risk ONUs or adding filters to the branch optical paths where the coexistence risk ONUs are located. This solves the coexistence problem of passive optical networks of different standards, and avoids upgrading and replacing all ONUs in the existing passive optical network system, thereby minimizing the waste of existing network resources.

[0165] Those skilled in the art will understand that the passive optical network coexistence method in Figure 14 can be implemented by the passive optical network coexistence device described above. The detailed description therein should be similar to the method description above, and will not be repeated here to avoid being cumbersome.

[0166] In summary, specific embodiments of this subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing can be advantageous.

[0167] Based on the same idea, this application also provides an electronic device, as shown in FIG15. The electronic device can vary considerably due to differences in configuration or performance, and may include one or more processors 1501 and memory 1502. The memory 1502 may store one or more application programs or data. The memory 1502 may be temporary or persistent storage. The application programs stored in the memory 1502 may include one or more modules (not shown in the figure), each module may include a series of computer-executable instructions for the electronic device. Furthermore, the processor 1501 may be configured to communicate with the memory 1502 and execute the series of computer-executable instructions in the memory 1502 on the electronic device. The electronic device may also include one or more power supplies 1503, one or more wired or wireless network interfaces 1504, one or more input / output interfaces 1505, and one or more keyboards 1506.

[0168] Specifically, in this embodiment, the electronic device includes a memory and one or more programs, wherein one or more programs are stored in the memory, and one or more programs may include one or more modules, and each module may include a series of computer-executable instructions for the electronic device, and is configured to be executed by one or more processors. The one or more programs include computer-executable instructions for performing the following: receiving a first-mode uplink optical signal sent by a first-mode ONU; dividing the first-mode uplink optical signal into a first-splitter optical signal and a second-splitter optical signal; converting the first-splitter optical signal into an electrical signal for output; determining whether the first-mode ONU is a coexistence risk ONU based on a target split optical signal; wherein the target split optical signal includes: the second split optical signal, or the first split optical signal and the second split optical signal; the difference between the signal wavelength of the first-mode uplink optical signal of the coexistence risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode OLT is less than a preset threshold.

[0169] The technical solution provided in this application involves receiving a first-mode uplink optical signal from a first-mode ONU and dividing it into a first-branch optical signal and a second-branch optical signal. For the first-branch optical signal, it can be converted into an electrical signal for output to ensure normal reception of services on the existing network. For the second-branch optical signal, it can be determined whether the first-mode ONU is a coexistence risk ONU based on the target branch optical signal. If the difference between the signal wavelength of the first-mode uplink optical signal of the coexistence risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode OLT is less than a preset threshold, multi-mode passive optical network coexistence is achieved while minimizing waste of existing network resources.

[0170] This application also proposes a computer-readable storage medium storing one or more computer programs, each including instructions that, when executed by an electronic device including multiple applications, enable the electronic device to perform various processes of the above-described passive optical network coexistence method embodiments, specifically for performing: receiving a first-mode uplink optical signal sent by a first-mode ONU; dividing the first-mode uplink optical signal into a first-splitter optical signal and a second-splitter optical signal; converting the first-splitter optical signal into an electrical signal for output; determining whether the first-mode ONU is a coexistence risk ONU based on a target split optical signal; wherein the target split optical signal includes: the second split optical signal, or the first split optical signal and the second split optical signal; the difference between the signal wavelength of the first-mode uplink optical signal of the coexistence risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode OLT is less than a preset threshold.

[0171] This application provides a computer program product, including a computer program, which is executed by a processor to implement the various processes of the passive optical network coexistence method embodiments described above, and can achieve the same technical effects. To avoid repetition, it will not be described again here.

[0172] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0173] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0174] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0175] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0176] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0177] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0178] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0179] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0180] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0181] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0182] This application can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0183] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0184] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the scope of the claims of this application.

Claims

1. A passive optical network coexistence device, comprising: Optical splitter, receiver, and coexistence risk screening module; The optical splitter is used to receive the first-mode uplink optical signal sent by the first-mode optical network unit (ONU). The first type of uplink optical signal is divided into a first split optical signal and a second split optical signal; the first split optical signal is transmitted to the receiver, and the second split optical signal is transmitted to the coexistence risk screening module; The receiver is used to receive the first split optical signal and convert the first split optical signal into an electrical signal for output. The coexistence risk screening module is used to receive the second branch optical signal and determine whether the first type ONU corresponding to the first type uplink optical signal is a coexistence risk ONU. Wherein, the difference between the signal wavelength of the first-mode uplink optical signal of the coexisting risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode optical line terminal OLT is less than a preset threshold.

2. The apparatus according to claim 1, wherein, The coexistence risk screening module includes a coexistence risk detection module and a coexistence risk identification module; The coexistence risk detection module is used to receive the second split optical signal and detect the signal parameter information of the second split optical signal; The coexistence risk identification module is used to acquire signal parameter information of the target split optical signal, and determine whether the first type ONU is the coexistence risk ONU based on the signal parameter information. The target split optical signal includes: the second split optical signal, or the first split optical signal and the second split optical signal.

3. The apparatus according to claim 1 or 2, wherein, The first type of uplink optical signal includes at least one of the following: Ethernet Passive Optical Network (EPON) uplink optical signal, 10Gbit / s Ethernet Passive Optical Network (10G EPON) uplink optical signal; The second type of downlink optical signal includes a 50Gbit / s passive optical network 50G PON downlink optical signal.

4. The apparatus according to claim 2, wherein, The coexistence risk detection module includes interconnected wavelength screening filters and detection units; The wavelength filtering filter is connected to the beam splitter.

5. The apparatus according to claim 4, wherein, The receiver is a multi-standard time-division multiplexing receiver, and the target split optical signal includes the second split optical signal; The wavelength filtering filter is used to receive the second split optical signal, and is turned on when the signal wavelength of the second split optical signal is within a first preset wavelength range, and turned off when the signal wavelength of the second split optical signal is within a safe wavelength range. The detection unit is used to detect the signal parameter information of the second split optical signal after passing through the wavelength filtering filter; wherein, the signal parameter information of the second split optical signal includes the second signal power of the second split optical signal; The coexistence risk identification module is used to obtain the second signal power of the second branch optical signal; in response to the second signal power being greater than or equal to a preset power threshold, the first type ONU is determined to be the coexistence risk ONU.

6. The apparatus according to claim 5, wherein, The first preset wavelength range includes a risk wavelength range and a buffer wavelength range; the risk wavelength range is the range of the operating wavelength of the coexisting risk ONU; the buffer wavelength range is located between the risk wavelength range and the safe wavelength range; the coexisting risk identification module is further used to determine the risk level of the coexisting risk ONU based on the second signal power.

7. The apparatus according to claim 5, wherein, The receiver is a multi-standard time-division multiplexing receiver, used to detect the first signal power of the first split optical signal; the target split optical signal includes the first split optical signal and the second split optical signal; The coexistence risk identification module is used to obtain the first signal power of the first split optical signal and the second signal power of the second split optical signal, and determine whether the first type ONU is the coexistence risk ONU based on the difference or ratio between the first signal power and the second signal power.

8. The apparatus according to claim 7, wherein, The coexistence risk identification module is used for: In response to the second signal power being greater than or equal to a preset power threshold, the difference or ratio between the first signal power and the second signal power is used to determine whether the first type ONU is the coexistence risk ONU.

9. The apparatus according to claim 7 or 8, wherein, The coexistence risk identification module is used for: In response to the absolute value of the power difference between the first signal power and the second signal power being less than or equal to a first difference threshold, the first type ONU is determined to be the coexistence risk ONU; or, In response to the power ratio of the first signal power and the second signal power being less than or equal to a first ratio threshold, the first type ONU is determined to be the coexistence risk ONU; or, In response to the power ratio of the second signal power to the first signal power being greater than a second ratio threshold, the first type ONU is determined to be the coexistence risk ONU.

10. The apparatus according to any one of claims 7 to 9, wherein, The coexistence risk identification module is also used for: After determining that the first type ONU is the coexisting risk ONU, it is determined that the first type uplink optical signal meets the preset risk conditions; The preset risk conditions include packet loss and / or the presence of bit errors.

11. The apparatus according to any one of claims 1 to 8, wherein, The receiver is a multi-standard time-division multiplexing receiver, which may include a single receiver or multiple receivers. In the case where the receiver includes a single receiver, the receiver is used to receive the first split optical signal in different time slots; wherein, the first split optical signal includes the first-mode uplink optical signal or the second-mode uplink optical signal, and the second-mode uplink optical signal is transmitted by the second-mode ONU. In the case where the receiver includes multiple receivers, the receiver is used to receive the first split optical signal in different time slots, or the first split optical signal and the second split optical signal; wherein, the first split optical signal includes the first type uplink optical signal, and the second split optical signal includes the second type uplink optical signal.

12. The apparatus according to any one of claims 4 to 9, wherein, The detection unit includes a detector and a detection signal processing circuit; The detection signal processing circuit is used to amplify the electrical signal output by the detector and output it to the coexistence risk identification module; or, to convert the electrical signal output by the detector into a level indication signal and output it to the coexistence risk identification module.

13. The apparatus according to claim 4, wherein, The receiver is a multi-mode wavelength division multiplexing receiver, used to detect the first signal power of the first split optical signal; The wavelength filtering filter is used to receive the second split optical signal, and is turned on when the signal wavelength of the second split optical signal is within a second preset wavelength range, and turned off when the signal wavelength of the second split optical signal is outside the second preset wavelength range; wherein, the second preset wavelength range is a broadband wavelength range; The detection unit is used to detect the signal parameter information of the second split optical signal after passing through the wavelength filtering filter; wherein, the signal parameter information of the second split optical signal includes the second signal power of the second split optical signal; The coexistence risk identification module is further configured to acquire the first signal power of the first split optical signal and the second signal power of the second split optical signal, and determine the first type ONU as the coexistence risk ONU based on the first signal power and the second signal power.

14. The apparatus according to claim 13, wherein, The coexistence risk identification module is also used for: In response to the absolute value of the power difference between the second signal power and the first signal power being greater than or equal to a second difference threshold, or in response to the power ratio between the second signal power and the first signal power being greater than or equal to a third ratio threshold, or in response to the power ratio between the first signal power and the second signal power being less than a fourth ratio threshold, the first type ONU is determined to be the coexistence risk ONU, and the PON type of the coexistence risk ONU is determined to be either EPON broadband or 10G EPON broadband.

15. The apparatus according to claim 13 or 14, wherein, The multi-mode wavelength division multiplexing receiver includes a multi-channel wavelength division multiplexing optical path and multiple receivers; The multi-channel wavelength division multiplexing optical path is used to receive the first split optical signal in different wavelength ranges and send the first split optical signal to each of the receivers. Each of the receivers is used to receive the first split optical signals of different wavelength ranges transmitted by the multi-channel wavelength division multiplexing optical path.

16. The apparatus according to claim 13, wherein, The coexistence risk screening module is also used to convert the second split optical signal into an electrical signal for output; The second branch optical signal has a broadband wavelength.

17. The apparatus according to claim 2, wherein, The coexistence risk identification module is implemented by an optical module, a system equipment microcontroller unit, a centralized processing unit, a software processing unit, or a network management platform.

18. A passive optical network coexistence system, comprising: A multi-standard OLT, an optical distribution network (ODN), and a first-standard ONU; the multi-standard OLT and the first-standard ONU are connected through the ODN; the multi-standard OLT is configured with a passive optical network coexistence device as described in any one of claims 1 to 17; The first type ONU is used to send the first type uplink optical signal to the multi-type OLT; The multi-standard OLT is used to determine, through the passive optical network coexistence device, whether the first standard ONU corresponding to the first standard uplink optical signal is a coexistence risk ONU. Wherein, the difference between the signal wavelength of the first-mode uplink optical signal of the coexisting risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode OLT is less than a preset threshold.

19. A method for coexistence of passive optical networks, comprising: Receive the first uplink optical signal sent by the first ONU, and divide the first uplink optical signal into a first branch optical signal and a second branch optical signal; The first split optical signal is converted into an electrical signal for output; Based on the target split optical signal, determine whether the first type ONU is a coexistence risk ONU; The target split optical signal includes: the second split optical signal, or the first split optical signal and the second split optical signal; the difference between the signal wavelength of the first-mode uplink optical signal of the coexisting risk ONU and the signal wavelength of the second-mode downlink optical signal of the multi-mode OLT is less than a preset threshold.

20. The method according to claim 19, wherein, When the target split optical signal includes the second split optical signal, determining whether the first type ONU is a coexistence risk ONU based on the target split optical signal includes: Obtain the second signal power of the second split optical signal; In response to the second signal power being greater than or equal to a preset power threshold, the first type ONU is determined to be the coexistence risk ONU.

21. The method according to claim 19, wherein, When the target split optical signal includes a first split optical signal and a second split optical signal, determining whether the first type ONU is a coexistence risk ONU based on the target split optical signal includes: Obtain the first signal power of the first split optical signal and the second signal power of the second split optical signal; Based on the difference or ratio between the first signal power and the second signal power, determine whether the first type ONU is a coexistence risk ONU.

22. The method according to claim 21, wherein, The method further includes: In response to the second signal power being greater than or equal to a preset power threshold, the difference or ratio between the first signal power and the second signal power is used to determine whether the first type ONU is the coexistence risk ONU.

23. The method according to claim 21 or 22, wherein, The step of determining whether the first type ONU is a coexistence risk ONU based on the difference or ratio between the first signal power and the second signal power includes: In response to the absolute value of the power difference between the first signal power and the second signal power being less than or equal to a first difference threshold, the first type ONU is determined to be the coexistence risk ONU; or, In response to the power ratio of the first signal power to the second signal power being less than or equal to a first ratio threshold, the first type ONU is determined to be the coexistence risk ONU; or, In response to the power ratio of the second signal power to the first signal power being greater than a second ratio threshold, the first type ONU is determined to be the coexistence risk ONU.

24. The method according to any one of claims 19 to 23, wherein, After determining that the first type ONU is the coexisting risk ONU, the method further includes: Determine that the uplink optical signal of the first standard meets the preset risk conditions; The preset risk conditions include packet loss and / or the presence of bit errors.

25. The method according to any one of claims 20 to 23, wherein, After determining that the first type ONU is the coexisting risk ONU, the method further includes: Replace the coexisting risk ONU; or, Add a filter to the branch optical path where the coexisting risk ONU is located.

26. An electronic device comprising a processor and a memory electrically connected to the processor, the memory storing a computer program, the processor being configured to call and execute the computer program from the memory to implement the passive optical network coexistence method as described in any one of claims 19 to 25.

27. A readable storage medium for storing a program or instructions which are executed by a processor to implement the passive optical network coexistence method as described in any one of claims 19 to 25.

28. A computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising a program or instructions which, when executed, implement the passive optical network coexistence method as described in any one of claims 19 to 25.

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