A Method, Device and System for Coexistence of 50G PON and FP ONU

Abstract

A method, device and system for coexistence of 50G PON and FP ONU, which relates to the multi-generation PON coexistence technology field of optical access network. The method includes: for all optical signal intensities sent by the FP ONU, calculating the ratio β of the optical signal intensity leaking into the 50G PON detector due to wavelength overlap and the optical signal intensity detected by the EPON detector fponu_n , β fponu_n is calculated by optical power or signal amplitude; according to β fponu_n set the reverse amplification ratio, and amplify the electrical signal detected by the EPON detector in reverse proportion to obtain the amplification result S FP2 ; perform interference cancellation on the electrical signal S1 detected by the 50G PON detector and S FP2 This application removes the influence of the FP ONU on the 50G PON detector, achieves the purpose of interference cancellation, and realizes the coexistence of 50G PON ONU and FP ONU.

Description

Technical Field

[0001] This application relates to the technical field of multi-generation PON coexistence in optical access networks, and specifically relates to a method, device, and system for coexistence of 50G PON and FP ONU. Background Art

[0002] Due to the continuous enrichment of telecommunications services, users' demand for access network bandwidth is also increasing day by day. Fiber access has become the primary choice for Fiber to the Home (FTTH) because it is suitable for long-distance transmission and has abundant bandwidth resources. In broadband access networks, Passive Optical Network (PON) technology is widely used. The PON technology is a point-to-multipoint fiber access technology, which consists of an Optical Line Terminal (OLT) on the central office side, an Optical Network Unit (ONU) on the user side, and an Optical Distribution Network (ODN).

[0003] With the continuous development of PON technology, 50-Gigabit-Capable PON has become the top choice for the next generation of PON technology after Ethernet PON (EPON), Gigabit-Capable PON (GPON), 10-Gigabit-Capable PON (XG PON), and 10-Gigabit-Capable Symmetric PON (XGS PON). It is of great significance to handle the transition between the old and new PON technologies.

[0004] The PON system uses broadcast technology for the downstream data stream and TDMA (Time Division Multiple Access) technology for the upstream data stream to solve the multiplexing problem of signals in each direction for multiple users. For example Figure 1As shown, the upstream wavelength range of GPON DFB ONU is 1310±20nm, the upstream wavelength range of EPON DFB ONU is 1310±20nm, the upstream wavelength range of EPON FP ONU is 1310±50nm, and the upstream wavelength range of 10G EPON FP ONU is 1310±50nm. Due to historical deployment reasons, there are still a large number of FP (Fabry-Perot) laser ONUs (hereinafter referred to as FP ONUs) in the operator's existing network. Due to the limitation of the optical chip implementation principle, FP lasers have the characteristic of multi-longitudinal modes and occupy a relatively wide upstream wavelength band (1310±50nm), which conflicts with the upstream wavelength (1286±2nm) and downstream wavelength (1342±2nm) of the DFB (Distributed Feedback Laser) laser ONU (hereinafter referred to as DFB ONU) used by 50G PON, thus affecting the 50G PON signal. Summary of the Invention

[0005] The present application provides a method, device and system for coexistence of 50G PON and FP ONU, which can solve the technical problem that FP ONU affects the 50G PON signal in the prior art and realize the coexistence of 50G PON ONU and FP ONU.

[0006] In a first aspect, an embodiment of the present application provides a method for coexistence of 50G PON and FP ONU, the method comprising:

[0007] The OLT discovers the FP ONU, and for all the optical signal intensities sent by the FP ONU, calculates the ratio β of the optical signal intensity leaked into the 50G PON detector due to the wavelength overlap of the FP ONU and the optical signal intensity detected by the EPON detector. fponu_n , the β fponu_n is calculated by optical power or signal amplitude;

[0008] According to β fponu_n set the reverse amplification ratio, and reversely amplify the electrical signal detected by the EPON detector by the ratio to obtain the amplification result SFP2;

[0009] Perform interference cancellation on the electrical signal S1 detected by the 50G PON detector and SFP2.

[0010] In combination with the first aspect, in an implementation, the OLT receives the upstream optical signals from different ONUs. A part of the optical signals with a wavelength range of 1286±2nm enter the 50G PON detector, and the split optical signals of the other part are filtered to remove the part with a wavelength range of 1342±2nm and then enter the EPON detector.

[0011] In combination with the first aspect, in one embodiment, the OLT discovers the FP ONU, including:

[0012] When the 10G / 1G EPON MAC of the OLT opens the silent window to complete the discovery and ranging of a new ONU, if the optical signal intensity detected by the 50G PON detector changes, the newly added ONU is the FP ONU, and the change amount of the optical signal intensity is the optical signal intensity leaked to the 50G PON detector due to the wavelength overlap of the FP ONU.

[0013] In combination with the first aspect, in one embodiment, the OLT discovers the FP ONU, including:

[0014] When the 50G PON MAC of the OLT opens the silent window and no new 50G PON ONU joins, if the optical signal intensity received by the 50G PON detector is not close to 0, it is found that the online ONU is the FP ONU, and the change amount of the optical signal intensity is the optical signal intensity leaked to the 50G PON detector due to the wavelength overlap of the FP ONU.

[0015] In combination with the first aspect, in one embodiment, when the 50G PON MAC of the OLT opens the silent window, if a relevant message indicating the joining of a new 50G PON ONU is received, it is determined that a new 50G PON ONU has joined; if the relevant message is not received, it is determined that no new 50G PON ONU has joined.

[0016] In combination with the first aspect, in one embodiment, the OLT discovers the FP ONU, including:

[0017] The EPON detector and the 50G PON detector at the OLT continuously monitor the signal intensity of the upstream optical signal from the ONU. When the EPON detector detects that the optical signal intensity suddenly rises from close to 0 and then gradually decreases to close to 0; at the same time, the 50G PON detector detects that the optical signal intensity also rises and then decreases synchronously, then the ONU is the FP ONU.

[0018] In combination with the first aspect, in one embodiment, create a table that contains all ONU IDs of type FP ONU at the ONU side and the corresponding β one by one fponu_n ;

[0019] After the OLT discovers the FP ONU, obtain the ONU ID of the FP ONU, and calculate the corresponding β by looking up the table fponu_n .

[0020] In combination with the first aspect, in one embodiment, when the 50G PON MAC of the OLT opens the silent window and no new 50G PON ONUs are added, the change amount of the optical signal intensity is detected by the 50G PON detector, and β is continuously corrected by combining the optical signal intensity detected by the EPON detector. fponu_n The corresponding ONU ID and its β are recorded. fponu_n The table is formed.

[0021] In combination with the first aspect, in one embodiment, the optical signal intensity is reflected by the optical power detected by the detector;

[0022] Alternatively, it is reflected by the signal amplitude after the optical signal detected by the detector is amplified.

[0023] In combination with the first aspect, in one embodiment, the process of obtaining the amplification result S FP2 and the process of performing interference cancellation on the electrical signal S1 detected by the 50G PON detector and S FP2 are implemented by an analog circuit or by a digital algorithm inside the DSP.

[0024] In a second aspect, an embodiment of the present application provides an apparatus based on the method for coexistence of 50G PON and FP ONU according to any one of the above, the apparatus includes:

[0025] A signal control unit, which is configured to calculate the ratio β of the optical signal intensity leaking into the 50G PON detector due to wavelength overlap and the optical signal intensity detected by the EPON detector for all optical signal intensities sent by the FP ONU when the OLT discovers the FP ONU. fponu_n ;

[0026] A reverse proportional amplification unit, which is configured to set a reverse amplification ratio according to β fponu_n and reversely amplify the electrical signal detected by the EPON detector by the reverse ratio to obtain the amplification result S FP2 ;

[0027] An interference cancellation unit, which is configured to perform interference cancellation on the electrical signal S1 detected by the 50G PON detector and S FP2 ;

[0028] In a third aspect, an embodiment of the present application provides a system for coexistence of 50G PON and FP ONU, including:

[0029] An EPON detector, which is configured to detect the optical power of the FP optical signal;

[0030] A 50G PON detector is used to detect the optical power of the FP optical signal leaked due to wavelength overlap and the optical power of the 50G PON optical signal;

[0031] It further includes the described device, which is used to calculate the ratio β of the optical signal intensity leaked into the 50G PON detector due to wavelength overlap and the optical signal intensity detected by the EPON detector fponu_n ; According to β fponu_n Set the reverse amplification ratio, reverse proportionally amplify the electrical signal detected by the EPON detector to obtain the amplification result SFP2; perform interference cancellation on the electrical signals S1 and SFP2 detected by the 50G PON detector.

[0032] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0033] Calculate the ratio β of the optical signal intensity leaked into the 50G PON detector due to wavelength overlap and the optical signal intensity detected by the EPON detector fponu_n , based on β fponu_n , by analyzing and processing the optical signal intensities detected by the EPON detector and the 50G PON detector at the OLT side, the influence of the FP ONU on the 50G PON detector is removed, the purpose of interference cancellation is achieved, and the coexistence of the 50G PON ONU and the FP ONU is realized. Description of the Drawings

[0034] Figure 1 Is the wavelength schematic diagram of the passive optical network in the prior art;

[0035] Figure 2 Is the schematic diagram for judging the ONU type in the embodiments of the present application;

[0036] Figure 3 Is the flowchart of the method for the coexistence of 50G PON and FP ONU in the embodiments of the present application;

[0037] Figure 4 Is the schematic diagram for realizing reverse proportion amplification and interference cancellation through the silent window mechanism in the embodiments of the present application;

[0038] Figure 5 Is the schematic diagram of another embodiment for realizing reverse proportion amplification and interference cancellation in the present application;

[0039] Figure 6 Is the schematic diagram for realizing reverse proportion amplification and interference cancellation through the signal amplitude of the electrical signal in the present application. Detailed Embodiments

[0040] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solution in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without making creative efforts belong to the scope of protection of this application.

[0041] To make the purpose, technical solution and advantages of this application clearer, the following will further describe the embodiments of this application in detail with reference to the drawings.

[0042] As Figure 1 and Figure 2 shown, in the existing network deployment, there will be a coexistence situation of FP ONU, 50G PON ONU, EPON DFB ONU, etc. The OLT receives the upstream optical signals sent from different types of ONUs and enters different detectors through the filter. Among them, a part of the optical signals with a wavelength range of 1286±2nm enter the 50G PON detector; another part of the optical signals are filtered by the next filter to remove the part with a wavelength range of 1342±2nm to avoid the influence of the downstream reflected light, and then enter the EPON detector. In this way, the wavelength range that can be detected in the EPON detector removes the optical signals with a wavelength range of 1342±2nm and 1286±2nm.

[0043] In general, the central wavelength of the FP ONU is near 1310nm, and the energy loss of the longitudinal modes in the wavelength bands near 1342nm and 1286nm is small, and the influence on the reception of the FP signal is very small; in the extreme case, the sensitivity of the receiver needs to be increased by about 4dB.

[0044] When the upstream signal is an optical signal sent by a 50G PON ONU, its upstream wavelength range is 1286 ± 2 nm, which can be detected by a 50G PON detector. Due to the filter, the EPON detector cannot detect signals within the range of 1286 ± 2 nm. Therefore, the EPON detector does not detect the corresponding optical signal. If the upstream signal is sent by an EPON DFB ONU (such as a narrowed 10G EPON upstream or a narrowed EPON upstream), its upstream wavelength range is 1310 ± 20 nm, which has no impact on the 50G PON detector. However, if the upstream signal is an optical signal sent by an FP ONU, with its upstream wavelength range being 1310 ± 50 nm, when its longitudinal mode range crosses 1286 nm, in addition to part of the signal entering the EPON detector, a small part also enters the 50G PON detector, thus interfering with the 50G PON upstream signal in communication. To solve this problem, since the interference signal of 50G PON comes from the FP ONU, its correlation can be utilized to eliminate the interference of 50G PON through certain software and hardware means.

[0045] In this embodiment, different detectors are distinguished according to the detected wavelength range. The EPON detector can be used to detect the upstream optical signals of EPON DFB ONUs and FP ONUs; the 50G PON detector can be used to detect the upstream optical signals of 50G PON ONUs and can also detect a small part of the upstream optical signals leaked due to the wavelength overlap of FP ONUs.

[0046] In a first aspect, an embodiment of the present application provides a method for coexistence of 50G PON and FP ONU.

[0047] In one embodiment, as Figure 3 shown, it is a schematic flowchart of an embodiment of the method for coexistence of 50G PON and FP ONU in the present application; the method includes:

[0048] S1. The OLT discovers the FP ONU and calculates the ratio β of the optical signal intensity leaked into the 50G PON detector due to the wavelength overlap of the FP ONU to the optical signal intensity detected by the EPON detector for all the optical signal intensities sent by the FP ONU. fponu_n β fponu_n is calculated through the optical power or signal amplitude. The optical signal intensity can be reflected by the optical power detected by the detector and also by the signal amplitude after the light detected by the detector is amplified.

[0049] In this embodiment, β fponu_n can be regarded as a parameter. When using the optical power to reflect the optical signal intensity, the calculation formula of β fponu_n is as follows:

[0050] β fponu_n = (1)

[0051] Among them, ∆RSSI_50G PON is the optical power leaked into the 50G PON detector due to the wavelength overlap of the FP ONU, and RSSI_FP is the optical power detected by the EPON detector.

[0052] S2. According to β fponu_n Set the reverse amplification ratio, and reverse proportionally amplify the electrical signal detected by the EPON detector to obtain the amplified result S after reverse proportional amplification FP2 .

[0053] S FP2 = -(β fponu_n ×S FP ) = -S FP_noise (2)

[0054] Among them, S FP is the electrical signal received by the EPON detector and amplified, and the amplified result S FP2 can be used to eliminate the interference generated by the FP ONU on the 50G PON S FP_noise . As Figure 4 shown, in this embodiment, the amplification factor for amplifying the electrical signal detected by the EPON detector is the same as that for amplifying the electrical signal detected by the 50G PON detector. In other embodiments, the parameters can also be corrected using different amplification factors so that the obtained S FP2 = -S FP_noise . During the communication process, when the upstream optical signals sent by the FP ONU and the 50G PON ONU are transmitted to the OLT, the optical signal entering the 50G PON detector is composed of the 50G PON optical signal and the optical signal leaked from the FP. Let the signal obtained after amplification be represented by S1, as shown in formula (3):

[0055] S1 = S 50G + S FP_noise (3)

[0056] Among them, S 50G represents the electrical signal after the photoelectric conversion of the 50G PON optical signal, and S FP_noise represents the electrical signal corresponding to the FP optical signal leakage interference. At the EPON detector, the optical power RSSI_FP can be obtained. After amplification and processed by formula (2), the influence part S FP2 of the FP ONU on the 50G PON can be obtained.

[0057] S3. Interference cancellation is performed on the electrical signals S1 and S detected by the 50G PON detector. After the interference cancellation process, the part of the optical leakage of the FP ONU uplink signal to the 50G PON detector is removed, and the 50G PON electrical signal is obtained, as shown in Equation (4): FP2 After the interference cancellation process, the part of the optical leakage of the FP ONU uplink signal to the 50G PON detector is removed, and the 50G PON electrical signal is obtained, as shown in Equation (4):

[0058] S0 = S1 + S FP2 = S 50G (4)

[0059] In this way, the influence of the FP ONU on the 50G PON detection is removed, thereby achieving the coexistence of the FP ONU and the 50G PON ONU.

[0060] As Figure 4 shown, it is a schematic diagram of realizing reverse proportional amplification and interference cancellation through the silent window mechanism in this application. When the TDM PON works, the silent window will be opened regularly to complete the discovery and ranging of new ONUs. If no new ONU joins, the optical power received by the OLT during the silent period is close to 0. In this embodiment, the OLT can discover the FP ONU in two ways.

[0061] The first way is:[[]]

[0062] When the 10G / 1G EPON MAC of the OLT opens the silent window to complete the discovery and ranging of new ONUs, if the intensity of the optical signal detected by the 50G PON detector changes, the newly added ONU is the FP ONU, and the change amount of the optical signal intensity is the optical signal intensity leaked to the 50G PON detector due to wavelength overlap.

[0063] In this embodiment, when the silent window opened by the 10G / 1G EPON MAC of the OLT, if the newly added ONU is the FPONU, it will cause the received optical power RSSI_50G PON of the 50G PON detector to change, indicating that the longitudinal mode of the wavelength of this ONU has leaked to the 50G PON detector. Record the ONU ID and MAC address or serial number SN at this time, and it is also found that the newly added ONU is the FP ONU. The change amount of the optical power is the above-mentioned ∆RSSI_50G PON, that is, S FP_noise .

[0064] The second way is:[[]]

[0065] When the 50G PON MAC of the OLT opens the silent window and no new 50G PON ONUs are added, if the optical signal intensity received by the 50G PON detector is not close to 0, it is found that the online ONU is an FP ONU, and the change in the optical signal intensity is the optical signal intensity leaked to the 50G PON detector due to wavelength overlap. Among them, the online ONU is the ONU that has been added and is transmitting data. During the silent window stage of 50G PON, if a new 50G PON ONU is added, the OLT will receive relevant messages; therefore, the OLT can determine whether a new 50G PON ONU has been added by receiving the relevant messages.

[0066] In this embodiment, when the 50G PON MAC of the OLT opens the silent window and no new 50G PON ONUs are added, RSSI_50G PON should be close to 0. If it is not close to 0 and the change amount is ∆RSSI_50G PON, it means that the wavelength of the corresponding FP ONU overlaps with the wavelength of the 50G PON ONU. Record the ONU ID at this time, and it is found that the online ONU is an FP ONU. At the same time, the received optical power of the EPON optical signal detector is RSSI_FP.

[0067] Both methods in this embodiment can determine the FP ONU. In actual work, the FP ONUs in the existing network can be detected by these two methods and replaced, which can also avoid the interference of FP ONUs to 50G PON. In addition, ∆RSSI_50G PON can be calculated through the change in the optical power of the 50G PON detector in both of the above two methods. However, in the second method, since it starts to change from close to 0, the calculation of ∆RSSI_50G PON in the second method is simpler than the first method.

[0068] As Figure 4 shown, in this embodiment, when the 10G / 1G EPON MAC opens the silent window, it is determined whether the newly added ONU is an FP ONU. The basis for the determination is whether the signal intensity detected by the 50G PON detector at the OLT end has changed. If the RSSI_50G PON detected by the 50G PON detector has not changed, then the newly added ONU is not an FP ONU; if the RSSI_50G PON detected by the 50G PON detector has changed, then the newly added ONU is an FP ONU. The signal control unit can calculate ∆RSSI_50G PON based on the above RSSI_50G PON. Combining RSSI_FP, the signal control unit outputs β fponu_n . Then, the optical signal received by the EPON detector is amplified by the EPON amplification unit to obtain SFP is inversely amplified by a reverse ratio amplification unit and the β output by the signal control unit fponu_n to perform inverse ratio amplification and obtain the output result S of the inverse ratio unit FP2 .

[0069] Since the optical signal entering the 50G PON detector is composed of the 50G PON optical signal and the optical signal leaked by the FP, the signal obtained after being amplified by the 50G PON amplification unit is S1. Finally, by performing interference cancellation processing on S FP2 and S1, the part of the optical signal leaked from the FP ONU upstream to the 50G PON detector is removed, and the influence of the FP ONU on the 50G PON detection is removed, thereby achieving the purpose of coexistence of the FP ONU and the 50G PON ONU. Among them, the amplification factors of the EPON amplification unit and the 50G PON amplification unit are the same.

[0070] Furthermore, in one embodiment, a table can be created in advance. This table contains all ONU IDs of the type of FPONU at the ONU end and the corresponding β fponu_n . After the OLT discovers the FP ONU, it obtains the ONU ID of the FP ONU and finds the corresponding β by looking up this table fponu_n .

[0071] In this embodiment, when the 50G PON MAC of the OLT opens the silent window and no new 50G PON ONUs are added, the FP ONU is continuously discovered. According to the detection results of the EPON detector and the 50G PON detector, β is continuously corrected through the above formula (1) fponu_n ; record the corresponding ONU ID and its β fponu_n , and form a β fponu_n parameter table. This table contains all the IDs of the type of FP ONU at the ONU end and their corresponding β fponu_n . Specifically, the change amount of the optical power received by the 50G PON detector is ∆RSSI_50G PON, and β is continuously corrected in combination with RSSI_FP fponu_n .

[0072] As Figure 4 shown, during the interference cancellation process, the 10G / 1G EPON MAC receives the upstream optical signal from the ONU. According to the corresponding ONU ID, using the β fponu_n parameter table formed by the above β fponu_n parameter acquisition process, find the β corresponding to the ONU ID fponu_n , and pass the β through the signal control unit fponu_nThe parameters are output to the reverse proportional amplifier unit to set the corresponding amplification ratio. The reverse proportional amplifier converts the electrical signal S detected by the EPON detector into FP Reverse proportional amplification to obtain S FP2 The signal entering the 50G PON detector is the 50G PON optical signal doped with the FP optical signal. According to formula (3), the processed signal is S1. FP2 Interference cancellation is performed to obtain the 50G PON electrical signal, as shown in formula (4), thus completing the entire interference cancellation process.

[0073] Furthermore, in the above embodiments, the process of obtaining the amplification result SFP2 and the electrical signals S1 and S FP2 The interference cancellation process can be implemented using analog circuits or digital algorithms within the DSP.

[0074] like Figure 5 As shown, a method is provided to obtain β without using a silent window mechanism. fponu_n This method embodiment can achieve loose coupling between the optical module and the PON MAC. The EPON detector and the 50G PON detector continuously monitor the signal strength of the upstream optical signal from the ONU. If the EPON detector detects that the optical signal strength suddenly increases from near 0 and then gradually decreases to near 0; and the 50G PON detector detects that the optical signal strength also increases and then decreases simultaneously, the ONU is an FP ONU.

[0075] In this embodiment, the EPON detector and 50G PON detector at the OLT continuously monitor the optical power of the upstream light from the ONU, which are recorded as RSSI_FP and RSSI_50GPON respectively. When a certain FP ONU performs a data block burst transmission, the online RSSI_FP monitored by the EPON detector will suddenly rise from close to 0 when the burst data starts to be sent. When the burst data transmission ends, it will be found that the online RSSI_FP monitored by the EPON detector gradually decreases to close to 0; if at the same time, the RSSI_50G PON monitored by the 50GPON detector also increases synchronously and then decreases, it means that the ONU at this time is an FP ONU. The change in signal strength monitored by the 50G PON detector at this time is recorded as ΔRSSI_50G PON, then β fponu_n It can be obtained by using the above formula (1). Record β fponu_n The corresponding ONU IDs are used to form a comparison table, and the subsequent reverse proportional amplification and interference cancellation process is consistent with the method adopted in the above embodiment.

[0076] like Figure 6As shown, an embodiment of realizing reverse proportional amplification and interference cancellation through the signal amplitude of an electrical signal is provided. In this embodiment, the optical signal intensity is reflected by the signal amplitude, and β is calculated fponu_n in a different way from the above embodiment, which specifically includes: after the optical signal RSSI_FP detected by the EPON detector is photoelectrically converted, it is amplified to obtain the signal amplitude AM_FP of the corresponding electrical signal; after the optical signal RSSI_50GPON detected by the 50G PON detector is photoelectrically converted, it is amplified to obtain the signal amplitude AM_50G PON of the corresponding electrical signal. According to the 50G PON detector, the signal amplitude ∆AM_50G PON leaked to the 50GPON detector due to wavelength overlap is obtained. Through ∆AM_50G PON and AM_FP, β is obtained according to the following formula fponu_n :

[0077] β fponu_n = .

[0078] In this embodiment, the process of determining that the ONU is an FP ONU is similar to the above embodiment. When the silent window of the 10G / 1G EPON MAC of the OLT is opened, if the newly added ONU is an FP ONU, it will cause a change in the signal amplitude AM_50G PON obtained after amplification by the 50G PON detector, indicating that the longitudinal mode of the wavelength of this ONU leaks to the 50G PON detector. Record the ONU ID and MAC address or serial number SN at this time, and it is also found that the newly added ONU is an FP ONU, and the change amount of the signal amplitude is the above ∆AM_50G PON.

[0079] Or, when the silent window of the 50G PON MAC of the OLT is opened and no new 50G PON ONUs are added, if the signal amplitude AM_50G PON received and amplified by the 50G PON detector is not close to 0, it is found that the online ONU is an FP ONU, and the change amount of the signal amplitude is the above ∆AM_50G PON. In this embodiment, through ∆AM_50G PON, β is continuously corrected in combination with the above AM_FP fponu_n , record the corresponding ONU ID and its β fponu_n , form a table, and subsequently, the β corresponding to the ONU ID can be found by looking up the table fponu_n .

[0080] In addition, the EPON detector and 50G PON detector at the OLT continuously monitor the upstream light from the ONU, converting it into electrical signals and then amplifying it to obtain the corresponding electrical signal amplitude. If the signal amplitude obtained by the EPON detector suddenly increases from close to 0 and then gradually decreases to close to 0; at the same time, the signal amplitude obtained by the 50G PON detector also increases and then decreases synchronously, then the ONU can also be determined to be an FP ONU.

[0081] In a second aspect, based on the above method embodiment, a device embodiment for coexistence of 50G PON and FP ONU is provided. The device includes a signal control unit, a reverse proportional amplification unit, and an interference cancellation unit.

[0082] The signal control unit is used to calculate the ratio β of the optical signal intensity leaked to the 50G PON detector due to the wavelength overlap of the FP ONU and the optical signal intensity detected by the EPON detector for all optical signal intensities sent by the FP ONU when the OLT discovers the FP ONU. fponu_n .

[0083] The inverse proportional amplification unit is used to fponu_n Set the reverse amplification ratio to amplify the electrical signal detected by the EPON detector in reverse proportion to obtain the amplification result S FP2 .

[0084] The interference cancellation unit is used to convert the electrical signals S1 and S FP2 Perform interference cancellation.

[0085] Among them, the functional implementation of each module in the above-mentioned device corresponds to each step in the above-mentioned method embodiment, and its functions and implementation processes are no longer described here one by one.

[0086] In a third aspect, a system for coexistence of 50G PON and FP ONU is provided, the system including an EPON detector, a 50GPON detector and the device in the above embodiment.

[0087] The EPON detector is used to detect and obtain the optical power of the FP optical signal.

[0088] The 50G PON detector is used to detect the optical power of the FP optical signal leaked due to the wavelength overlap of the FP ONU and the optical power of the 50G PON optical signal.

[0089] The device in the above embodiment is used to calculate the ratio β of the optical signal intensity leaked to the 50G PON detector due to wavelength overlap and the optical signal intensity detected by the EPON detector. fponu_n According to β fponu_nSet the reverse amplification ratio to amplify the electrical signal detected by the EPON detector in reverse proportion to obtain the amplification result S FP2 ; And perform interference cancellation on the electrical signals S1 and S detected by the 50G PON detector FP2 .

[0090] For the system in this embodiment, calculate β fponu_n . By analyzing and processing the optical signal intensities detected by the EPON detector and the 50G PON detector at the OLT side, the influence of the FP ONU on the 50G PON detector is removed, achieving the purpose of interference cancellation. Compared with the conventional method, the existing PON software and hardware architecture is fully utilized, and a large number of FPONUs of the operator are effectively utilized, significantly reducing both the cost and power consumption.

[0091] It should be noted that the serial numbers of the embodiments of the present application above are only for description and do not represent the superiority or inferiority of the embodiments.

[0092] The terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices. The descriptions of terms such as "first", "second", and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit that "first", "second", and "third" are different types.

[0093] In the description of the embodiments of the present application, terms such as "exemplary", "for example", or "for illustration" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary", "for example", or "for illustration" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of terms such as "exemplary", "for example", or "for illustration" is intended to present relevant concepts in a specific manner.

[0094] In the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B can represent A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality of" means two or more than two.

[0095] In some processes described in the embodiments of the present application, there are multiple operations or steps that appear in a specific order. However, it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or may be executed in parallel. The serial numbers of the operations are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0096] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above and includes several instructions for causing a terminal device to execute the methods described in the various embodiments of the present application.

[0097] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A method for coexistence of 50G PON and FP ONU, characterized in that, The method includes: The OLT discovers the FP ONU, and for all the optical signal intensities transmitted by the FP ONU, calculates the ratio β of the optical signal intensity leaking into the 50G PON detector due to the wavelength overlap of the FP ONU and the optical signal intensity detected by the EPON detector. fponu_n , the β fponu_n is calculated by the optical power or the signal amplitude; According to β fponu_n Set the reverse amplification ratio to amplify the electrical signal detected by the EPON detector in reverse proportion to obtain the amplification result S FP2 ; The electrical signals S1 and S detected by the 50G PON detector FP2 are subjected to interference cancellation; The OLT discovers the FP ONU, including: When the 50G PON MAC of the OLT opens the silent window and no new 50G PON ONU joins, if the optical signal intensity received by the 50G PON detector is not close to 0, it is found that the online ONU is the FP ONU, and the change amount of the optical signal intensity is the optical signal intensity leaked to the 50G PON detector due to the wavelength overlap of the FP ONU; When the 50G PON MAC of the OLT opens the silent window and no new 50G PON ONUs are added, the change amount of the optical signal intensity is detected by the 50G PON detector, and β is continuously corrected by combining the optical signal intensity detected by the EPON detector fponu_n , record the corresponding ONU ID and its β fponu_n , and form a table.

2. The method for coexistence of 50G PON and FP ONU according to claim 1, characterized in that: The OLT receives the upstream optical signals from different ONUs. A part of the optical signals with a wavelength range of 1286±2nm enter the 50G PON detector, and the other part of the split optical signals are filtered by a filter to remove the part with a wavelength range of 1342±2nm and then enter the EPON detector.

3. The method for coexistence of 50G PON and FP ONU according to claim 1, characterized in that The OLT discovers the FP ONU, including: When the 10G / 1G EPON MAC of the OLT opens the silent window to complete the discovery and ranging of new ONUs, if the optical signal intensity detected by the 50G PON detector changes, the newly added ONU is the FP ONU, and the change amount of the optical signal intensity is the optical signal intensity leaked to the 50G PON detector due to the wavelength overlap of the FP ONU.

4. The method for coexistence of 50G PON and FP ONU according to claim 1, characterized in that : When the 50G PON MAC of the OLT opens the silent window, if a relevant message indicating the joining of a new 50G PON ONU is received, it is determined that a new 50G PON ONU has joined; if the relevant message is not received, it is determined that no new 50G PON ONU has joined.

5. The method for coexistence of 50G PON and FP ONU according to claim 1, wherein The OLT discovers the FP ONU, including: The EPON detector and the 50G PON detector at the OLT continuously monitor the signal intensity of the upstream optical signal from the ONU. When the EPON detector detects that the optical signal intensity suddenly rises from close to 0 and then gradually decreases to close to 0; at the same time, if the 50G PON detector detects that the optical signal intensity also rises and then decreases synchronously, then the ONU is the FP ONU.

6. The method for coexistence of 50G PON and FP ONU according to claim 1, characterized in that: The table contains the ONU IDs of all ONUs of type FP ONU at the ONU side and the corresponding β one by one fponu_n ; After the OLT discovers the FP ONU, it obtains the ONU ID of the FP ONU and calculates the corresponding β by looking up the said table. fponu_n .

7. The method for coexistence of 50G PON and FP ONU according to claim 1, characterized in that: The optical signal intensity is reflected by the optical power detected by the detector; Or, it is reflected by the signal amplitude of the optical signal detected by the detector after amplification processing.

8. The method for coexistence of 50G PON and FP ONU according to claim 1, characterized in that: The process of obtaining the amplified result S FP2 and the process of performing interference cancellation on the electrical signals S1 and S FP2 detected by the 50G PON detector are implemented using analog circuits or digital algorithms inside the DSP.

9. An apparatus for a method of coexistence of 50G PON and FP ONU according to any one of claims 1-8, characterized in that, The device includes: A signal control unit, which is used to calculate the ratio β of the optical signal intensity leaking into the 50G PON detector due to wavelength overlap and the optical signal intensity detected by the EPON detector for all optical signal intensities transmitted by the FP ONU when the OLT discovers the FP ONU fponu_n ; An inverse proportional amplification unit, which is used to set an inverse amplification ratio according to β fponu_n and inversely proportionally amplify the electrical signal detected by the EPON detector to obtain an amplified result S FP2 ; An interference cancellation unit, which is used to perform interference cancellation on the electrical signals S1 and S detected by a 50G PON detector FP2 ​ 10. A system for coexistence of 50G PON and FP ONU, characterized in that, Including: An EPON detector for detecting the optical power of the FP optical signal; A 50G PON detector for detecting the optical power of the FP optical signal leaked due to wavelength overlap and the optical power of the 50G PON optical signal; It further includes the device described in claim 9, which is used to calculate the ratio β of the optical signal intensity leaking into the 50G PON detector due to wavelength overlap to the optical signal intensity detected by the EPON detector fponu_n ; According to β fponu_n Set the reverse amplification ratio, and amplify the electrical signal detected by the EPON detector in reverse proportion to obtain the amplification result S FP2 ; The electrical signals S1 and S detected by the 50G PON detector FP2 Perform interference cancellation.

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