CN120128838A - A method, device and system for coexistence of 50G PON and FP ONU - Google Patents

A method, device and system for coexistence of 50G PON and FP ONU Download PDF

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CN120128838A
CN120128838A CN202510612695.7A CN202510612695A CN120128838A CN 120128838 A CN120128838 A CN 120128838A CN 202510612695 A CN202510612695 A CN 202510612695A CN 120128838 A CN120128838 A CN 120128838A
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pon
onu
detector
optical signal
epon
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CN120128838B (en
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刘新峰
熊伟成
祝振东
沈琼霞
秦煜朋
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Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects

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Abstract

一种50G PON与FP ONU共存的方法、装置及系统，涉及光接入网多代PON共存技术领域，方法包括：对于FP ONU发送的所有光信号强度，计算因波长重叠而泄漏到50G PON探测器的光信号强度和被EPON探测器探测到的光信号强度的比例βfponu_n，βfponu_n通过光功率或者信号幅度计算；根据βfponu_n设置反向放大比例，将EPON探测器探测得到的电信号反向比例放大，得到放大结果SFP2；将50G PON探测器探测得到的电信号S1和SFP2进行干扰抵消。本申请去除FP ONU对50G PON探测器造成的影响，达到干扰抵消的目的，实现50G PON ONU与FP ONU的共存。

A method, device and system for the coexistence of 50G PON and FP ONU, relating to the technical field of coexistence of multi-generation PON in optical access network, the method comprising: for all optical signal intensities sent by FP ONU, calculating the ratio β fponu_n 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, β fponu_n is calculated by optical power or signal amplitude; setting a reverse amplification ratio according to β fponu_n , amplifying the electrical signal detected by the EPON detector in reverse proportion, and obtaining an amplification result S FP2 ; performing interference cancellation on the electrical signals S 1 and S FP2 detected by the 50G PON detector. The present application removes the influence of 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

Method, device and system for coexistence of 50G PON and FP ONU
Technical Field
The application relates to the technical field of multi-generation PON coexistence of optical access networks, in particular to a method, a device and a system for coexistence of a 50G PON and an FP ONU.
Background
As telecommunication services continue to be abundant, users are increasingly demanding access to network bandwidth. Fiber optic access has become the primary choice for fiber to the home (Fiber to the Home, FTTH) because of its suitability for long haul transport and abundant bandwidth resources. In broadband access networks, passive optical network (Passive Optical Network, PON) technology is widely used. The PON technology is a point-to-multipoint Optical fiber access technology, and is composed of an Optical line terminal (Optical LINE TERMINAL, OLT) at the office side, an Optical network unit (Optical Network Unit, ONU) at the user side, and an Optical distribution network (Optical Distribution Network, ODN).
With the continuous development of PON technology, a 50 Gigabit passive optical network (50-Gigabit-Capable PON) is the primary choice of next-generation PON technology for Ethernet Passive Optical Networks (EPON), gigabit passive optical networks (Gigabit-Capable PON, GPON), 10 Gigabit passive optical networks (10-Gigabit-Capable PON, XG PON), and 10 Gigabit symmetric passive optical networks (10-Gigabit-Capable Symmetric PON, XGs PON), which has very important significance in handling the transition between new and old PON technologies.
The downstream of the PON system adopts broadcasting technology, and the upstream adopts TDMA (Time Division Multiple Access ) technology, so as to solve the multiplexing problem of signals of each direction of multiple users. As shown in fig. 1, the upstream wavelength range of the GPON DFB ONU is 1310± 20nm,EPON DFB ONU, 1310±20nm, and 1310± 50nm,10G EPON FP ONU is 1310±50nm. For historical deployment reasons, a great number of FP (Fabry-Perot) lasers ONU (hereinafter referred to as FP ONUs) exist in the existing network of operators, and due to the limitation of the implementation principle of the optical chip, the FP lasers have a multi-longitudinal mode characteristic and occupy a wider upstream wavelength band (1310±50 nm), which conflicts with the DFB (Distributed Feedback Laser, distributed feedback) lasers ONU (hereinafter referred to as DFB ONUs) used by the 50G PON, and the downstream wavelength (1342±2 nm), so as to affect the signals of the 50G PON.
Disclosure of Invention
The application provides a method, a device and a system for coexistence of a 50G PON and an FP ONU, which can solve the technical problem that the FP ONU in the prior art affects a 50G PON signal, and realize coexistence of the 50G PON ONU and the FP ONU.
In a first aspect, an embodiment of the present application provides a method for coexistence of a 50G PON and an FP ONU, where the method includes:
The OLT discovers the FP ONU, calculates the proportion beta fponu_n of the light signal intensity leaked to the 50G PON detector due to the overlapping of the FP ONU wavelengths and the light signal intensity detected by the EPON detector for all the light signal intensities sent by the FP ONU, wherein the beta fponu_n is calculated through the light power or the signal amplitude;
Setting a reverse amplification ratio according to beta fponu_n, and amplifying the electric signal detected by the EPON detector in a reverse ratio to obtain an amplification result SFP2;
And carrying out interference cancellation on the electric signals S1 and SFP2 detected by the 50G PON detector.
In combination with the first aspect, in one embodiment, the OLT receives 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 another part of the optical signals are filtered by a filter to remove a part with a wavelength range of 1342±2nm, and then enter the EPON detector.
With reference to the first aspect, in an implementation manner, the discovering, by the OLT, the FP ONU includes:
when the 10G/1G EPON MAC of the OLT opens a silence window to finish the discovery ranging of a new ONU, if the intensity of the optical signal detected by the 50G PON detector changes, the newly added ONU is an FP ONU, and the change of the intensity of the optical signal is the intensity of the optical signal leaked to the 50G PON detector due to the overlapping of the wavelengths of the FP ONU.
With reference to the first aspect, in an implementation manner, the discovering, by the OLT, the FP ONU includes:
When the 50G PON MAC of the OLT opens a silence window and no new 50G PON ONU is added, if the intensity of the optical signal received by the 50G PON detector is not close to 0, the on-line ONU is found to be the FP ONU, and the variation of the intensity of the optical signal is the intensity of the optical signal leaked to the 50G PON detector due to the overlapping of the wavelengths of the FP ONU.
In combination with the first aspect, in one implementation, when the 50G PON MAC of the OLT opens the silence window, if a related message of a new 50G PON ONU join is received, it is determined that there is a new 50G PON ONU join, and if the related message is not received, it is determined that there is no new 50G PON ONU join.
With reference to the first aspect, in an implementation manner, the discovering, by the OLT, the FP ONU includes:
The EPON detector and the 50G PON detector at the OLT continuously monitor the signal intensity of the uplink light from the ONU, when the EPON detector detects that the optical signal intensity is increased from nearly 0 burst, the optical signal intensity is gradually reduced to nearly 0, and meanwhile, when the 50G PON detector detects that the optical signal intensity is synchronously increased and then reduced, the ONU is the FP ONU.
With reference to the first aspect, in one embodiment, a table is created, where the table includes ONU IDs of all types of FP ONUs at the ONU end and β fponu_n that are in one-to-one correspondence;
After the OLT discovers the FP ONU, the ONU ID of the FP ONU is obtained, and the corresponding beta fponu_n is calculated by searching the table.
With reference to the first aspect, in one embodiment, when the 50G PON MAC of the OLT opens the silence window and no new 50G PON ONU is added, the variable amount of the optical signal intensity is detected by the 50G PON detector, β fponu_n is continuously corrected in conjunction with the optical signal intensity detected by the EPON detector, and the corresponding ONU ID and β fponu_n thereof are recorded, so as to form the table.
With reference to the first aspect, in one implementation manner, the optical signal intensity is represented by optical power detected by a detector;
or the signal amplitude of the light detected by the detector after amplification treatment is reflected.
With reference to 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 signals S 1 and S FP2 detected by the 50G PON detector are implemented by using an analog circuit or implemented by using a digital algorithm inside the DSP.
In a second aspect, an embodiment of the present application provides an apparatus based on a method for coexistence of a 50G PON and an FP ONU according to any one of the preceding claims, where the apparatus includes:
A signal control unit for calculating a ratio β fponu_n of the intensity of the optical signal leaked to the 50G PON detector due to the overlapping of wavelengths to the intensity of the optical signal detected by the EPON detector for all the intensities of the optical signals transmitted by the FP ONUs when the OLT discovers the FP ONUs;
the reverse proportion amplifying unit is used for setting a reverse amplifying proportion according to beta fponu_n, and amplifying the electric signal detected by the EPON detector in a reverse proportion to obtain an amplifying result S FP2;
And the interference cancellation unit is used for performing interference cancellation on the electric signals S 1 and S FP2 detected by the 50G PON detector.
In a third aspect, an embodiment of the present application provides a system for coexistence of a 50G PON and an FP ONU, 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 by the overlapping of wavelengths and the optical power of the 50G PON optical signal;
The device is used for calculating the proportion beta fponu_n of the intensity of the optical signal leaked to the 50G PON detector due to wavelength overlapping and the intensity of the optical signal detected by the EPON detector, setting the reverse amplification proportion according to beta fponu_n, amplifying the electric signal detected by the EPON detector in a reverse proportion to obtain an amplification result SFP2, and carrying out interference cancellation on the electric signals S1 and SFP2 detected by the 50G PON detector.
The technical scheme provided by the embodiment of the application has the beneficial effects that:
The proportion beta fponu_n of the optical signal intensity leaked to the 50G PON detector due to the overlapping of the wavelengths and the optical signal intensity detected by the EPON detector is calculated, the influence of the FP ONU on the 50G PON detector is removed based on beta fponu_n by analyzing and processing the optical signal intensities detected by the EPON detector and the 50G PON detector at the OLT end, the purpose of interference cancellation is achieved, and the coexistence of the 50G PON ONU and the FP ONU is realized.
Drawings
Fig. 1 is a wavelength schematic diagram of a passive optical network in the prior art;
fig. 2 is a schematic diagram of determining an ONU type according to an embodiment of the present application;
Fig. 3 is a flow chart of a method for coexistence of 50G PON and FP ONUs according to an embodiment of the present application;
fig. 4 is a schematic diagram of implementing reverse scaling and interference cancellation by a silence window mechanism according to an embodiment of the present application;
FIG. 5 is a schematic diagram of another embodiment of the present application implementing reverse scaling and interference cancellation;
fig. 6 is a schematic diagram of the present application for reverse scaling and interference cancellation by signal amplitude of an electrical signal.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, in the existing network deployment, FP ONUs, 50G PON ONUs, EPON DFB ONUs, and the like coexist. The OLT receives the uplink optical signals sent by the ONUs of different types, and the uplink optical signals enter different detectors through the filter. One part of optical signals with the wavelength range of 1286+/-2 nm enter the 50G PON detector, and the other part of optical signals are filtered by the next filter to remove the part with the wavelength range of 1342+/-2 nm so as to avoid the influence of downlink reflected light and then enter the EPON detector. Thus, the wavelength range that can be detected in an EPON detector eliminates optical signals having wavelength ranges of 1342+ -2 nm and 1286+ -2 nm.
In general, the FP ONU has a center wavelength of 1310nm or around, a longitudinal mode loss in a wavelength band of 1342nm or around 1286nm, and has a small influence on the FP signal reception, and in the limit, it is necessary to increase the sensitivity of the receiver by about 4 dB.
When the upstream signal is an optical signal transmitted by a 50G PON ONU, the upstream wavelength range thereof is 1286±2nm, which can be detected by a 50G PON detector, and the EPON detector does not include 1286±2nm in the detectable range due to the filter, so that the EPON detector does not detect a corresponding optical signal. If the uplink signal is sent by an EPON DFB ONU (such as 10G EPON uplink narrowing and EPON uplink narrowing), the uplink wavelength range is 1310+/-20 nm, and the 50G PON detector is not affected. However, if the uplink signal is an optical signal sent by the FP ONU, since the uplink wavelength range thereof is 1310±50nm, when the longitudinal range thereof spans 1286nm, a small portion of the signal enters the 50G PON detector in addition to a portion thereof, thereby causing interference to the 50G PON uplink signal being communicated. To solve this problem, since the interference signal of the 50G PON is from the FP ONU, the interference of the 50G PON can be eliminated by using the correlation thereof by a certain hardware and software means.
In this embodiment, different detectors are distinguished according to the detected wavelength range, and the EPON detector can be used to detect the upstream optical signals of the EPON DFB ONU and the FP ONU, and the 50G PON detector can be used to detect the upstream optical signal of the 50G PON ONU, and also can detect a small portion of the upstream optical signal leaked due to the overlapping wavelength of the FP ONU.
In a first aspect, an embodiment of the present application provides a method for coexistence of a 50G PON and an FP ONU.
In an embodiment, as shown in fig. 3, a flow chart of an embodiment of a method for coexistence of a 50G PON and an FP ONU according to the present application is shown, where the method includes:
S1, the OLT discovers the FP ONU, calculates the proportion beta fponu_n,βfponu_n of the intensity of the optical signal leaked to the 50G PON detector due to the overlapping of the wavelengths of the FP ONU and the intensity of the optical signal detected by the EPON detector according to the optical power or the signal amplitude. The optical signal intensity can be represented by the optical power detected by the detector and also represented by the signal amplitude of the light detected by the detector after amplification.
In this embodiment, β fponu_n can be regarded as a parameter, and the optical power is used to represent the optical signal strength, and the calculation formula of β fponu_n is as follows:
βfponu_n=(1)
Here, the rssi_50g PON is the optical power leaked to the 50G PON detector due to the FP ONU wavelength overlapping, and the rssi_fp is the optical power detected by the EPON detector.
And S2, setting a reverse amplification ratio according to beta fponu_n, and amplifying the electric signal detected by the EPON detector in a reverse ratio to obtain an amplified result S FP2 after the reverse amplification.
SFP2= -(βfponu_n×SFP) = -SFP_noise(2)
Wherein S FP is an electrical signal received by the EPON detector and amplified, and the amplification result S FP2 may be used to eliminate the interference S FP_noise generated by the FP ONU on the 50G PON. As shown in fig. 4, in this embodiment, the amplification factor of the electric signal detected by the EPON detector is the same as that of the electric signal detected by the 50G PON detector. In other embodiments, the parameters may be modified using different magnifications, so that the resulting S FP2= -SFP_noise. In the communication process, when uplink optical signals sent by the FP ONU and the 50G PON ONU are transmitted to the OLT, an optical signal entering the 50G PON detector is composed of a 50G PON optical signal and an FP leaked optical signal, so that a signal obtained after amplification is represented by S 1, as shown in formula (3):
S1= S50G+ SFP_noise(3)
Wherein S 50G represents an electrical signal of the 50G PON after optical signal is photoelectrically converted, and S FP_noise represents an electrical signal corresponding to FP optical signal leakage interference. The optical power rssi_fp can be obtained at the EPON detector, and after being amplified and processed by the formula (2), the influence part S FP2 of the FP ONU on the 50G PON is obtained.
And S3, performing interference cancellation on the electric signals S 1 and S FP2 detected by the 50G PON detector. And removing the part of the FP ONU uplink signal light leaked to the 50G PON detector through interference cancellation processing to obtain a 50G PON electric signal, wherein the electric signal is shown in a formula (4):
S0= S1+SFP2= S50G(4)
Thus, the influence of the FP ONU on the 50G PON detection is removed, and the aim of coexistence of the FP ONU and the 50G PON ONU is fulfilled.
As shown in fig. 4, a schematic diagram of the present application for implementing reverse scaling and interference cancellation by a silence window mechanism is shown. When the TDM PON works, a silence window is opened at regular time to finish the discovery ranging of the new ONU, and if no new ONU is added, the optical power received by the OLT during the silence period is approximately 0. In this embodiment, the OLT may discover the FP ONUs in two ways.
The first way is:
when the 10G/1G EPON MAC of the OLT opens a silence window to finish the discovery ranging of a new ONU, if the intensity of the optical signal detected by the 50G PON detector changes, the newly added ONU is an FP ONU, and the change of the intensity of the optical signal is the intensity of the optical signal leaked to the 50G PON detector due to the overlapping of wavelengths.
In this embodiment, when the 10G/1G EPON MAC of the OLT opens a silence window, if the newly added ONU is an FP ONU, the received optical power rssi_50g PON of the 50G PON detector will change, which indicates that the wavelength longitudinal mode of the ONU leaks to the 50G PON detector, record the ONU ID and the MAC address or the serial number SN at this time, and find that the newly added ONU is an FP ONU, and the change amount of the optical power is the rssi_50g PON, that is, S FP_noise.
The second mode is as follows:
When the 50G PON MAC of the OLT opens a silence window and no new 50G PON ONU is added, if the intensity of the optical signal received by the 50G PON detector is not close to 0, the on-line ONU is found to be the FP ONU, and the variation of the intensity of the optical signal is the intensity of the optical signal leaked to the 50G PON detector due to the overlapping of wavelengths. Wherein an on-line ONU is an already joined ONU that is transmitting data. The 50G PON is in a silence window stage, if a new 50G PON ONU is added, the OLT receives the relevant information, so that the OLT can judge whether the new 50G PON ONU is added or not by receiving the relevant information.
In this embodiment, when the 50G PON MAC of the OLT opens the silence window and no new 50G PON ONU is added, the rssi_50g PON should be close to 0, if the variation is not close to 0, the wavelength corresponding to the FP ONU overlaps with the wavelength of the 50G PON ONU, the ONU ID at this time is recorded, the on-line ONU is found to be the FP ONU, and the received light power of the EPON optical signal detector is rssi_fp.
In the practical work, the FP ONU in the current network can be detected in both modes, and replaced, so that the FP ONU can be prevented from interfering with the 50G PON. In addition, both of the above methods can calculate the father rssi_50g PON from the optical power change of the 50G PON detector, but since the second method is to change from approximately 0, the second method is simpler to calculate the father rssi_50g PON than the first method.
As shown in fig. 4, in this embodiment, when the 10G/1G EPON MAC opens the silence window, it is determined whether the newly added ONU is an FP ONU, and it is determined whether the signal strength detected by the 50G PON detector at the OLT side is changed. If the RSSI_50G PON detected by the 50G PON detector is unchanged, the newly added ONU is not the FP ONU, and if the RSSI_50G PON detected by the 50G PON detector is changed, the newly added ONU is the FP ONU. The signal control unit can calculate and obtain the father RSSI_50G PON according to the RSSI_50G PON, and the signal control unit outputs beta fponu_n by combining with the RSSI_FP. Then, the optical signal received by the EPON detector is amplified by the EPON amplifying unit to obtain S FP, and is reversely scaled by β fponu_n output by the reverse scaling unit and the signal control unit to obtain a reverse scaling unit output result S FP2.
Because the optical signal entering the 50G PON detector consists of the 50G PON optical signal and the FP leaked optical signal, the signal obtained after being amplified by the 50G PON amplifying unit is S 1, and finally, the interference cancellation processing is carried out on S FP2 and S 1, the part of the FP ONU uplink light leaked to the 50G PON detector is removed, and the influence of the FP ONU on the 50G PON detection is removed, thereby achieving the aim of coexistence of the FP ONU and the 50G PON ONU. Wherein, the amplification factors of the EPON amplifying unit and the 50G PON amplifying unit are the same.
Further, in an embodiment, a table may be created in advance, where the table includes ONU IDs of all types of FP ONUs at the ONU end and β fponu_n corresponding to each other. After the OLT discovers the FP ONU, the OLT obtains the ONU ID of the FP ONU, and finds the corresponding β fponu_n by looking up the table.
In this embodiment, when the 50G PON MAC of the OLT opens a silence window and no new 50G PON ONU is added, the FP ONU is continuously discovered. According to the detected results of EPON detector and 50G PON detector, continuously correcting beta fponu_n by the above formula (1), recording corresponding ONU ID and beta fponu_n thereof, and forming a beta fponu_n parameter table which contains all the IDs of FP ONU and corresponding beta fponu_n. Specifically, the variation of the optical power received by the 50G PON detector is the father rssi_50g PON, and β fponu_n is continuously corrected in combination with the rssi_fp.
As shown in fig. 4, in the interference cancellation process, the 10G/1G EPON MAC receives the uplink light from the ONU, and according to the corresponding ONU ID, uses the β fponu_n parameter table formed in the previous β fponu_n parameter acquisition process to find the β fponu_n corresponding to the ONU ID, and outputs the β fponu_n parameter to the reverse scaling unit through the signal control unit, so as to set the corresponding scaling ratio. The inverse proportional amplifier inversely proportional amplifies the electric signal S FP obtained by the detection processing of the EPON detector according to the formula (2), so as to obtain S FP2. The incoming 50G PON detector signal is a 50G PON optical signal doped with an FP optical signal, and the processed signal is S 1 according to equation (3). And (3) performing interference cancellation on the S 1 and the S FP2 to obtain 50G PON electric signals, wherein the whole interference cancellation process is finished as shown in a formula (4).
Further, in the above embodiments, the process of obtaining the amplification result SFP2 and the process of performing interference cancellation on the electrical signals S 1 and S FP2 detected by the 50G PON detector may be implemented by using an analog circuit or a digital algorithm inside the DSP.
As shown in fig. 5, an embodiment of a method for obtaining β fponu_n without using a silence window mechanism is provided, which can implement loose coupling between an optical module and PON MAC. The EPON detector and the 50G PON detector continuously monitor the signal intensity of the uplink light from the ONU, when the EPON detector detects that the optical signal intensity is increased from approximately 0 burst and gradually reduced to approximately 0, and meanwhile, the 50G PON detector detects that the optical signal intensity is synchronously increased and then reduced, and the ONU is the FP ONU.
In this embodiment, the EPON detector and the 50G PON detector at the OLT continuously monitor the optical power of the upstream light from the ONU, denoted as rssi_fp and rssi_50GPON, respectively. When a certain FP ONU performs burst transmission of a data block, the on-line RSSI_FP monitored by an EPON detector is raised from approximately 0 burst when burst data starts to be transmitted, when the burst data transmission is finished, the on-line RSSI_FP monitored by the EPON detector is found to be gradually lowered to approximately 0, and if the on-line RSSI_FP monitored by a 50G PON detector is lowered after being synchronously raised, the ONU at the moment is the FP ONU. When the signal strength variation monitored by the 50G PON detector at this time is recorded as Δrssi_50g PON, β fponu_n can be obtained by using the above formula (1). The record β fponu_n and the corresponding ONU ID form a comparison table, and the subsequent reverse scaling and interference cancellation are consistent with the methods used in the above embodiments.
As shown in fig. 6, an embodiment is provided in which inverse scaling and interference cancellation are achieved by the signal amplitude of the electrical signal. In this embodiment, the manner of calculating β fponu_n is different from the above embodiment by reflecting the optical signal strength by the signal amplitude, and specifically includes amplifying the optical signal rssi_fp detected by the EPON detector after photoelectric conversion to obtain the signal amplitude am_fp of the corresponding electrical signal, and amplifying the optical signal rssi_50GPON detected by the 50G PON detector after photoelectric conversion to obtain the signal amplitude am_50G PON of the corresponding electrical signal. From the 50G PON detector, the signal amplitude father am_50g PON that leaks to the 50G PON detector due to wavelength overlap is obtained, and β fponu_n is obtained from father am_50g PON and am_fp according to the following formula:
βfponu_n=。
In this embodiment, the procedure of determining that the ONU is an FP ONU is similar to the above embodiment, when the 10G/1G EPON MAC of the OLT opens a silence window, if the newly added ONU is an FP ONU, the signal amplitude am_50g PON obtained by amplifying the newly added ONU after the 50G PON detector changes, which indicates that the wavelength longitudinal mode of the ONU leaks to the 50G PON detector, records the ONU ID and the MAC address or the serial number SN at this time, and also finds that the newly added ONU is an FP ONU, and the change amount of the signal amplitude is am_50g PON.
Or when the 50G PON MAC of the OLT opens a silence window and no new 50G PON ONU is added, if the signal amplitude AM_50G PON received and amplified by the 50G PON detector is not close to 0, the on-line ONU is found to be the FP ONU, and the variation of the signal amplitude is the AM_50G PON. In this embodiment, by associating am_50g PON with am_fp to continuously correct β fponu_n, recording the corresponding ONU ID and β fponu_n thereof, forming a table, and then searching for β fponu_n corresponding to the ONU ID by looking up a table.
In addition, the EPON detector and the 50G PON detector at the OLT continuously monitor uplink light from the ONU to perform photoelectric conversion, then the signal amplitude of the corresponding electric signal is obtained through amplification, when the signal amplitude obtained by the EPON detector is raised from approximately 0 burst, the signal amplitude is gradually reduced to approximately 0, and meanwhile, the signal amplitude obtained by the 50G PON detector is synchronously raised and then reduced, and then the ONU can be determined to be the FP ONU.
In a second aspect, based on the above method embodiment, there is provided an embodiment of an apparatus in which a 50G PON and an FP ONU coexist, the apparatus including a signal control unit, an inverse proportional amplifying unit, and an interference cancellation unit.
And a signal control unit for calculating a ratio beta fponu_n of the intensity of the optical signal leaked to the 50G PON detector due to the overlapping of the wavelengths of the FP ONU and the intensity of the optical signal detected by the EPON detector for all the intensities of the optical signals transmitted by the FP ONU when the OLT discovers the FP ONU.
And the reverse proportion amplifying unit is used for setting a reverse amplifying proportion according to beta fponu_n, and amplifying the electric signal detected by the EPON detector in a reverse proportion to obtain an amplifying result S FP2.
And the interference cancellation unit is used for performing interference cancellation on the electric signals S 1 and S FP2 detected by the 50G PON detector.
The function implementation of each module in the device corresponds to each step in the method embodiment, and the function and implementation process of each module are not described in detail herein.
In a third aspect, a system for coexistence of a 50G PON with FP ONUs is provided, which includes an EPON detector, a 50G PON detector, and the apparatus in the above-described embodiments.
And the EPON detector is used for detecting and obtaining the optical power of the FP optical signal.
And a 50G PON detector for detecting the optical power of the FP optical signal leaked by the overlapping of the FP ONU wavelengths and the optical power of the 50G PON optical signal.
The device in the above embodiment is used for calculating the ratio beta fponu_n of the intensity of the optical signal leaked to the 50G PON detector due to the overlapping of wavelengths and the intensity of the optical signal detected by the EPON detector, setting the reverse amplification ratio according to beta fponu_n, amplifying the electric signal detected by the EPON detector in a reverse ratio to obtain an amplification result S FP2, and performing interference cancellation on the electric signals S 1 and S FP2 detected by the 50G PON detector.
In the system in this embodiment, β fponu_n is calculated, and by analyzing and processing the intensities of the optical signals detected by the EPON detector and the 50G PON detector at the OLT end, the influence of the FP ONU on the 50G PON detector is removed, so as to achieve the purpose of interference cancellation. Compared with the conventional method, the method fully utilizes the software and hardware architecture of the conventional PON, effectively utilizes a large number of FP ONUs of operators, and remarkably reduces cost and power consumption.
It should be noted that, the foregoing reference numerals of the embodiments of the present application are merely for describing the embodiments, and do not represent the advantages and disadvantages of the embodiments.
The terms "comprising" and "having" and any variations thereof in the description and claims of the application and in the foregoing drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus. The terms "first," "second," and "third," etc. are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order, and are not limited to the fact that "first," "second," and "third" are not identical.
In describing embodiments of the present application, "exemplary," "such as," or "for example," etc., are used to indicate by way of example, illustration, or description. Any embodiment or design described herein as "exemplary," "such as" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "such as" or "for example," etc., is intended to present related concepts in a concrete fashion.
In the description of the embodiment of the present application, "/" means or, for example, a/B may mean a or B, and "and/or" in the text is merely an association relationship describing an association object, means that three relationships may exist, for example, a and/or B, three cases where a exists alone, a and B exist together, and B exists alone, and further, in the description of the embodiment of the present application, "a plurality" means two or more.
In some of the processes described in the embodiments of the present application, a plurality of operations or steps occurring in a particular order are included, but it should be understood that the operations or steps may be performed out of the order in which they occur in the embodiments of the present application or in parallel, the sequence numbers of the operations merely serve to distinguish between the various operations, and the sequence numbers themselves do not represent any order of execution. In addition, the processes may include more or fewer operations, and the operations or steps may be performed in sequence or in parallel, and the operations or steps may be combined.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising several instructions for causing a terminal device to perform the method according to the embodiments of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (12)

1.一种50G PON与FP ONU共存的方法，其特征在于，所述方法包括：1. A method for coexistence of 50G PON and FP ONU, characterized in that the method comprises: OLT发现FP ONU，对于FP ONU发送的所有光信号强度，计算因FP ONU波长重叠而泄漏到50G PON探测器的光信号强度和被EPON探测器探测到的光信号强度的比例βfponu_n，所述βfponu_n通过光功率或者信号幅度计算；The OLT discovers the FP ONU, and for all optical signal intensities sent by the FP ONU, calculates the ratio β fponu_n 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, where β fponu_n is calculated by optical power or signal amplitude; 根据βfponu_n设置反向放大比例，将EPON探测器探测得到的电信号反向比例放大，得到放大结果SFP2；The reverse amplification ratio is set according to βfponu_n , and the electrical signal detected by the EPON detector is reversely amplified to obtain the amplification result SFP2 ; 将50G PON探测器探测得到的电信号S1和SFP2进行干扰抵消。The electrical signals S1 and SFP2 detected by the 50G PON detector are subjected to interference cancellation. 2.如权利要求1所述的50G PON与FP ONU共存的方法，其特征在于：2. The method for coexistence of 50G PON and FP ONU according to claim 1, characterized in that: OLT接收来自不同ONU的上行光信号，一部分波长范围是1286±2nm的光信号进入到50GPON探测器，另一部的分光信号经过滤波片滤除掉波长范围是1342±2nm的部分，再进入到EPON探测器中。The OLT receives upstream optical signals from different ONUs. A portion of the optical signal with a wavelength range of 1286±2nm enters the 50GPON detector, and the other portion of the split optical signal is filtered out by a filter to remove the portion with a wavelength range of 1342±2nm, and then enters the EPON detector. 3.如权利要求1所述的50G PON与FP ONU共存的方法，其特征在于，所述OLT发现FPONU，包括：3. The method for coexistence of 50G PON and FP ONU according to claim 1, wherein the OLT discovers the FPONU, comprising: 当OLT的10G/1G EPON MAC打开静默窗口完成新的ONU的发现测距时，如果50G PON探测器探测到的光信号强度发生变化，则新加入的ONU是FP ONU，光信号强度的变化量，即为因所述 FP ONU波长重叠而泄漏到50G PON探测器的光信号强度。When the 10G/1G EPON MAC of the OLT opens the silent window to complete the discovery and ranging of the new ONU, if the optical signal strength detected by the 50G PON detector changes, the newly added ONU is an FP ONU, and the change in the optical signal strength is the optical signal strength leaked to the 50G PON detector due to the wavelength overlap of the FP ONU. 4.如权利要求1所述的50G PON与FP ONU共存的方法，其特征在于，所述OLT发现FPONU，包括：4. The method for coexistence of 50G PON and FP ONU according to claim 1, wherein the OLT discovers the FPONU, comprising: 当OLT的50G PON MAC打开静默窗口、并且没有新的50G PON ONU加入时，如果50G PON探测器接收的光信号强度不接近0，则发现在线的ONU是FP ONU，光信号强度的变化量，即为因FP ONU波长重叠而泄漏到50G PON探测器的光信号强度。When the 50G PON MAC of the OLT opens the silent window and no new 50G PON ONU is added, if the optical signal strength received by the 50G PON detector is not close to 0, it is found that the online ONU is an FP ONU. The change in the optical signal strength is the optical signal strength leaked to the 50G PON detector due to the wavelength overlap of the FP ONU. 5.如权利要求1所述的50G PON与FP ONU共存的方法，其特征在于:5. The method for coexistence of 50G PON and FP ONU as claimed in claim 1, characterized in that: 当OLT的50G PON MAC打开静默窗口，如果收到新的50G PON ONU加入的相关消息，则判断为有新的50G PON ONU加入；如果没有收到所述相关消息，则判断为没有新的50G PONONU加入。When the 50G PON MAC of the OLT opens the silent window, if a related message about the addition of a new 50G PON ONU is received, it is determined that a new 50G PON ONU has been added; if the related message is not received, it is determined that no new 50G PON ONU has been added. 6.如权利要求1所述的50G PON与FP ONU共存的方法，其特征在于，所述OLT发现FPONU，包括：6. The method for coexistence of 50G PON and FP ONU according to claim 1, wherein the OLT discovers the FPONU, comprising: OLT处的EPON探测器和50G PON探测器持续监测来自ONU上行光的信号强度，当EPON探测器探测到光信号强度由接近于0突发升高后，再逐渐降低至接近于0；同时，50G PON探测器探测到光信号强度也同步升高后降低，则该ONU为FP ONU。The EPON detector and 50G PON detector at the OLT continuously monitor the signal strength of the upstream light from the ONU. When the EPON detector detects that the optical signal strength suddenly increases 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 strength also increases and then decreases synchronously, then the ONU is an FP ONU. 7.如权利要求1所述的50G PON与FP ONU共存的方法，其特征在于：7. The method for coexistence of 50G PON and FP ONU according to claim 1, characterized in that: 创建一个表格，该表格包含ONU端所有类型为FP ONU的ONU ID以及一一对应的βfponu_n；Create a table containing the ONU IDs of all FP ONUs on the ONU side and the corresponding β fponu_n ; OLT发现FP ONU后，获得该FP ONU的ONU ID，通过查找所述表格的方式，计算对应的βfponu_n。After the OLT discovers the FP ONU, it obtains the ONU ID of the FP ONU and calculates the corresponding β fponu_n by searching the table. 8.如权利要求7所述的50G PON与FP ONU共存的方法，其特征在于：8. The method for coexistence of 50G PON and FP ONU according to claim 7, characterized in that: 当OLT的50G PON MAC打开静默窗口、并且没有新的50G PON ONU加入时，通过50G PON探测器探测光信号强度的变化量，结合EPON探测器探测到的光信号强度不断修正βfponu_n，记录对应的ONU ID及其βfponu_n，形成所述表格。When the 50G PON MAC of the OLT opens the silent window and no new 50G PON ONU is added, the change in the optical signal strength is detected by the 50G PON detector, and β fponu_n is continuously corrected in combination with the optical signal strength detected by the EPON detector, and the corresponding ONU ID and its β fponu_n are recorded to form the table. 9.如权利要求1所述的50G PON与FP ONU共存的方法，其特征在于：9. The method for coexistence of 50G PON and FP ONU according to claim 1, characterized in that: 所述光信号强度通过探测器探测到的光功率体现；The intensity of the optical signal is reflected by the optical power detected by the detector; 或者，通过探测器探测到的光经过放大处理后的信号幅度体现。Alternatively, it is reflected by the signal amplitude after the light detected by the detector is amplified. 10.如权利要求1所述的50G PON与FP ONU共存的方法，其特征在于：10. The method for coexistence of 50G PON and FP ONU according to claim 1, characterized in that: 所述得到放大结果SFP2的过程、以及将50G PON探测器探测得到的电信号S1和SFP2进行干扰抵消的过程，采用模拟电路实现，或者采用DSP内部的数字算法实现。The process of obtaining the amplification result S FP2 and the process of performing interference cancellation on the electrical signals S 1 and S FP2 detected by the 50G PON detector are implemented by using an analog circuit or a digital algorithm inside a DSP. 11.一种基于权利要求1-10任一项所述的50G PON与FP ONU共存的方法的装置，其特征在于，所述装置包括：11. A device for the method for coexistence of 50G PON and FP ONU according to any one of claims 1 to 10, characterized in that the device comprises: 信号控制单元，其用于在OLT发现FP ONU时，对于FP ONU发送的所有光信号强度，计算因波长重叠而泄漏到50G PON探测器的光信号强度和被EPON探测器探测到的光信号强度的比例βfponu_n；A signal control unit, which is used to calculate the ratio β fponu_n of the optical signal strength leaked to the 50G PON detector due to wavelength overlap and the optical signal strength detected by the EPON detector for all optical signal strengths sent by the FP ONU when the OLT discovers the FP ONU ; 反向比例放大单元，其用于根据βfponu_n设置反向放大比例，将EPON探测器探测得到的电信号反向比例放大，得到放大结果SFP2；A reverse proportional amplification unit, which is used to set a reverse amplification ratio according to βfponu_n , reversely amplify the electrical signal detected by the EPON detector, and obtain an amplification result SFP2 ; 干扰抵消单元，其用于将50G PON探测器探测得到的电信号S1和SFP2进行干扰抵消。The interference cancellation unit is used to cancel the interference of the electrical signals S1 and SFP2 detected by the 50G PON detector. 12.一种50G PON与FP ONU共存的系统，其特征在于，包括：12. A system for coexistence of 50G PON and FP ONU, comprising: EPON探测器，其用于探测得到FP光信号的光功率；EPON detector, which is used to detect the optical power of the FP optical signal; 50G PON探测器，其用于探测得到因波长重叠而泄漏的FP光信号的光功率和50G PON光信号的光功率；50G PON detector, which 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; 还包括如权利要求11所述的装置，该装置用于计算因波长重叠而泄漏到50G PON探测器的光信号强度和被EPON探测器探测到的光信号强度的比例βfponu_n；根据βfponu_n设置反向放大比例，将EPON探测器探测得到的电信号反向比例放大，得到放大结果SFP2；将50G PON探测器探测得到的电信号S1和SFP2进行干扰抵消。It also includes the device as described in claim 11, which is used to calculate the ratio β fponu_n of the intensity of the optical signal leaked to the 50G PON detector due to wavelength overlap and the intensity of the optical signal detected by the EPON detector; set the reverse amplification ratio according to β fponu_n , reversely proportionally amplify the electrical signal detected by the EPON detector to obtain the amplification result S FP2 ; and perform interference cancellation on the electrical signals S 1 and S FP2 detected by the 50G PON detector.
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