Passive optical network (PON) coexistence method and apparatus

Abstract

Embodiments of the present disclosure provide a passive optical network (PON) coexistence method and apparatus. The method comprises: at a same moment, controlling one of a 50G PON downlink signal and an EPON & 10G EPON uplink optical signal to be transmitted in a PON optical path, wherein the 50G PON downlink signal comprises a 50G PON downlink optical signal and / or a 50G PON downlink optical reflection signal, and the EPON & 10G EPON uplink optical signal comprises an EPON uplink optical signal and / or a 10G EPON uplink optical signal.

Description

Passive optical network (PON) coexistence method and device

[0001] Cross-reference to Related Applications

[0002] The present application is based on Chinese Patent Application No. CN202410618792.2 entitled “Passive optical network (PON) coexistence method and device” filed on May 17, 2024, and claims priority to the same, the disclosure of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] Embodiments of the present disclosure relate to the field of communications, and in particular, to a passive optical network (PON) coexistence method and device. BACKGROUND

[0004] Passive optical network (PON) has experienced three generations of development, originating from the early A / B-PON, the first generation of Gigabit-capable Passive Optical Network (GPON) and Ethernet Passive Optical Network (EPON) based on Ethernet have been widely used and have completed large-scale commercialization. The second generation of 10G-EPON and XG(S)-PON equipment has matured and has been commercially used on a large scale. With the development of PON technology, 50Gbit / s Passive optical network (50G PON) will also begin to be commercially used. In the initial stage of the commercialization of 50G PON, there will be a large number of coexistence scenarios with traditional PON.

[0005] 50G PON coexistence with traditional PON mainly includes two systems of EPON and GPON coexistence evolution. In the GPON system, 50G PON wavelength planning Option 3 supports wavelength coexistence with GPON and XG / XGS-PON, and can take the form of external coexistence element (Coexistence Element Type x, CEx) or built-in multi-mode optical module (Multi-PON Module, MPM) of combiner to evolve and upgrade. The uplink wavelength of EPON and 10Gbit / s Ethernet Passive Optical Network (10Gbit / s Ethernet Passive Optical Network, 10G EPON) asymmetric non-narrow uplink wavelength distribution range is 1260-1360nm, which conflicts with the downlink working wavelength 1342+ / -2nm of 50G PON. In the PON optical distribution network (Optical Distribution Network, ODN), the fiber connection end face is suspended, dirty, fiber bending, fiber damage and other situations will cause light signal reflection, which will cause the downlink working wavelength of 50G PON to be reflected back to the optical line terminal (Optical Line Terminal, OLT) optical module, and enter the EPON uplink receiver, causing EPON uplink service abnormalities.

[0006] In summary, the PON system in the related art has the problem that the 50G PON downlink light reflection affects the EPON and 10G EPON uplink service. SUMMARY

[0007] According to one embodiment of the present disclosure, a passive optical network PON coexistence method is provided, comprising: controlling one of a 50Gbit / s passive optical network 50G PON downlink signal and an EPON&10G EPON uplink optical signal to be transmitted in a PON optical path at the same time, wherein the 50G PON downlink signal includes a 50G PON downlink optical signal and / or a 50G PON downlink optical reflection signal, and the EPON&10G EPON uplink optical signal includes an EPON uplink optical signal and / or a 10G EPON uplink optical signal.

[0008] According to another embodiment of the present disclosure, a passive optical network (PON) coexistence device is provided, comprising an optical line terminal (OLT) and an optical network unit (ONU), wherein the OLT comprises a time / bandwidth allocation control module, and the ONU comprises an EPON ONU and / or a 10G EPON ONU; the time / bandwidth allocation control module is configured to generate configuration information indicating the opening or closing of optical signal transmission of the EPON ONU and / or the 10G EPON ONU, wherein at the same time, one of a 50G PON downstream signal and an EPON&10G EPON upstream optical signal is controlled to be transmitted in a PON optical path, the 50G PON downstream signal being a 50G PON downstream optical signal and / or a 50G PON downstream optical reflection signal, and the EPON&10G EPON upstream optical signal being an EPON upstream optical signal and / or a 10G EPON upstream optical signal.

[0009] According to still another embodiment of the present disclosure, a computer readable storage medium is also provided, and the computer readable storage medium stores a computer program, wherein the computer program is configured to execute the steps in any of the above method embodiments when executed.

[0010] According to still another embodiment of the present disclosure, a computer program product is also provided, comprising computer programs / instructions, which, when executed by a processor, implement the steps in any of the above method embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0011] FIG. 1 is a hardware structure block diagram of a mobile terminal of a PON coexistence method according to an embodiment of the present disclosure;

[0012] FIG. 2 is a flowchart of a PON coexistence method according to an embodiment of the present disclosure;

[0013] FIG. 3 is still another flowchart of a PON coexistence method according to an embodiment of the present disclosure;

[0014] FIG. 4 is a structure block diagram of a PON coexistence device according to an embodiment of the present disclosure;

[0015] FIG. 5 is a schematic diagram of a PON coexistence method according to an embodiment of the present disclosure;

[0016] FIG. 6 is still another schematic diagram of a PON coexistence method according to an embodiment of the present disclosure;

[0017] FIG. 7 is a schematic diagram of an implementation mode of optical signal opening or closing according to an embodiment of the present disclosure;

[0018] FIG. 8 is a structure block diagram of a PON coexistence system according to an embodiment of the present disclosure;

[0019] FIG. 9 is a structure schematic diagram of a multimode optical module according to an embodiment of the present disclosure;

[0020] Fig. 10 is a structural schematic of a multiplexer / demultiplexer module according to an embodiment of the present disclosure;

[0021] Fig. 11 is another schematic diagram of a PON coexistence method according to an embodiment of the present disclosure;

[0022] Fig. 12 is another schematic diagram of an implementation of turning on or off of an optical signal according to an embodiment of the present disclosure;

[0023] Fig. 13 is another schematic diagram of a PON coexistence method according to an embodiment of the present disclosure;

[0024] Fig. 14 is another schematic diagram of an implementation of turning on or off of an optical signal according to an embodiment of the present disclosure;

[0025] Fig. 15 is another structural schematic of a multimode optical module according to an embodiment of the present disclosure;

[0026] Fig. 16 is another structural schematic of a multiplexer / demultiplexer module according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings and in conjunction with embodiments.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily refer to a specific order or sequence.

[0029] PON technology is a kind of Point-to-Multipoint (P2MP) broadband access technology based on ODN network, and the uplink and downlink transmission wavelengths are independent, and the data is time division multiplexed (TDM). The network adopts P2MP topology, and one PON port can connect multiple optical network units (ONUs), and the local resource is greatly reduced. At the same time, the intermediate ODN network is passive throughout, easy to build and expand, and the comprehensive cost is low. The construction and maintenance cost is low, easy to expand and upgrade. PON technology is the most mature broadband optical fiber access technology, which has the advantages of high reliability, high bandwidth, multi-service bearing and low cost.

[0030] When the three generations of passive optical networks, EPON, 10G EPON and 50G PON coexist, the wavelength range of EPON conflicts with the downlink wavelength of 50G PON, and the reflection of the 50G PON downlink optical signal affects the normal operation of the EPON uplink. In the related technology, by changing the 50G PON downlink wavelength, it is not overlapped with the EPON uplink wavelength, so that the reflected signal can be filtered out by the OLT optical module receiving optical path filter, but this scheme does not conform to the current 50G PON standard, and at the same time, a new laser class needs to be developed, which is not conducive to the cost reduction and specification unification of the optical module.

[0031] The method embodiments provided in the embodiments of the present disclosure can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking the case of running on a mobile terminal, Fig. 1 is a hardware structure block diagram of a mobile terminal of a PON coexistence method according to an embodiment of the present disclosure. As shown in Fig. 1, the mobile terminal can include one or more (only one is shown in Fig. 1) processors 102 (the processor 102 can include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the above-mentioned mobile terminal can further include a transmission device 106 for communication function and an input and output device 108. Those skilled in the art can understand that the structure shown in Fig. 1 is only schematic, which does not limit the structure of the above-mentioned mobile terminal. For example, the mobile terminal can further include more or less components than those shown in Fig. 1, or have a different configuration from that shown in Fig. 1.

[0032] The memory 104 can be used to store computer programs, for example, software programs of application software and modules, such as the computer program corresponding to the PON coexistence method in the embodiments of the present disclosure. The processor 102 executes various functional applications and data processing by running the computer programs stored in the memory 104, that is, implements the above-mentioned method. The memory 104 can include a high-speed random access memory, and can also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor 102, which can be connected to the mobile terminal through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0033] The transmission device 106 is configured to receive or send data via a network. The network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network interface controller (NIC) that can be connected to other network devices through a base station to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module that is configured to communicate with the Internet wirelessly.

[0034] The embodiment of the present disclosure provides a PON coexistence method, and Fig. 2 is a flowchart of the PON coexistence method according to the embodiment of the present disclosure. As shown in Fig. 2, the flow includes the following steps:

[0035] In step S202, one of the 50G PON downstream signal and the EPON&10G EPON upstream optical signal is controlled to be transmitted in the PON optical path at the same time.

[0036] In the embodiment of the present disclosure, the 50G PON downstream signal includes a 50G PON downstream optical signal and / or a 50G PON downstream optical reflection signal, and the EPON&10G EPON upstream optical signal includes an EPON upstream optical signal and / or a 10G EPON upstream optical signal.

[0037] Fig. 3 is another flowchart of the PON coexistence method according to the embodiment of the present disclosure. As shown in Fig. 3, the flow includes the following steps:

[0038] In step S302, the OLT is controlled to send the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal in a first time period, and to stop sending the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal outside the first time period.

[0039] In one example embodiment, the first time period is at least one of the following: a partial time period of a downstream frame signal period of the PON; one or more downstream frame signal periods of the PON.

[0040] In an example embodiment, the partial time period is at least one of: a time period of a fixed time length; a plurality of time periods of fixed time length and continuous; a time period of a non-fixed time length; a plurality of time periods of non-fixed time length and discontinuous. In the embodiments of the present disclosure, different time length of downlink frame signal period can be selected to implement the PON coexistence method of the embodiments of the present disclosure, which is not specifically limited here. For example, a partial time period in a 125 μs PON downlink frame signal period is taken as the first time period in the above-mentioned embodiment, and a time period in the 125 μs PON downlink frame signal period except the first time period is taken as the second time period in the above-mentioned embodiment. Alternatively, a different number of 125 μs PON downlink frame signal periods are taken as the first time period in the above-mentioned embodiment, and the other 125 μs PON downlink frame signal periods except the first time period are taken as the second time period in the above-mentioned embodiment.

[0041] In the embodiments of the present disclosure, the first time period in the different time length of downlink frame signal period can be a fixed continuous time period and the time length is configurable, or can be a non-fixed discontinuous plurality of time periods. For example, taking the 125 μs PON downlink frame signal period as an example, the 50G PON downlink optical signal opening time in each 125 μs PON downlink frame signal period can be a fixed continuous time period and the time length is configurable, or can be a non-fixed discontinuous plurality of time periods. When the 50G PON downlink optical signal opening time adopts a fixed continuous time period, the system implementation is relatively simple; when the 50G PON downlink optical signal opening time is a non-fixed discontinuous plurality of time periods, the system bandwidth utilization can be optimized to the highest.

[0042] In the embodiments of the present disclosure, in order to ensure that the 50G PON downlink reflected light does not conflict with the EPON or 10G EPON uplink, the system can be provided with a certain length of protection time interval after the 50G PON downlink optical signal is closed and before the EPON uplink optical signal and / or 10G EPON uplink optical signal is opened.

[0043] The protection time interval is greater than or equal to the difference between the time required for the 50G PON downlink reflected optical signal to be transmitted to the OLT and the time required for the EPON uplink optical signal and / or 10G EPON uplink optical signal to be transmitted to the OLT. Since there are multiple reflections of the 50G PON downlink optical signal in the PON network, the 50G PON downlink optical signal is a 50G PON downlink reflected optical signal with optical power exceeding a set threshold. The set threshold can be set according to the received optical power of the EPON or 10G EPON uplink optical signal entering the OLT in the PON network.

[0044] In an example embodiment, the time length of the first time period is determined by an optical line terminal (OLT) of the PON system according to service parameter information.

[0045] In an example embodiment, the service parameter information comprises at least one of the following: downstream service traffic of the 50G PON; upstream service traffic of the EPON or the 10G EPON; service priority of the downstream service of the 50G PON; and service priority of the upstream service of the EPON or the 10G EPON.

[0046] In the embodiments of the present disclosure, the opening and closing time length of the 50G PON downstream optical signal can be uniformly scheduled by the OLT device of the system according to the 50G PON downstream service traffic and the EPON and 10G EPON upstream service traffic, and the service priority.

[0047] In an example embodiment, in the first time period, the 50G PON upstream optical signal stops transmitting.

[0048] In the embodiments of the present disclosure, the 50G PON downstream optical signal is turned on for a partial time period (i.e., the first time period described above) and turned off for a partial time period, wherein in the time period when the 50G PON downstream optical signal is turned on, the EPON, 10G EPON upstream optical signal and the 50G PON upstream optical signal are turned off.

[0049] In step S304, the ONU is controlled to transmit the EPON upstream optical signal or the 10G EPON upstream optical signal in the second time period and stop transmitting the EPON upstream optical signal or the 10G EPON upstream optical signal outside the second time period.

[0050] In an example embodiment, the second time period does not overlap with the first time period.

[0051] In an example embodiment, the second time period overlaps or partially overlaps with the first time period.

[0052] In an embodiment, since it takes a certain time for the 50G PON downstream optical signal to be reflected back to the OLT optical module and it also takes a certain time for the EPON or 10G EPON upstream optical signal to reach the OLT optical module, the first time period and the second time period can overlap or partially overlap, as long as the 50G PON downstream optical reflection signal does not conflict with the EPON or 10G EPON upstream optical signal in the PON optical path at the same time.

[0053] In an example embodiment, after the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal is stopped at the second time period, a preset protection time interval is passed, and then the EPON upstream optical signal or the 10G EPON upstream optical signal is transmitted.

[0054] In the embodiments of the present disclosure, the time period for transmitting the EPON upstream optical signal or the 10G EPON upstream optical signal does not necessarily occupy the entire second time period, that is, the time period for transmitting the EPON upstream optical signal or the 10G EPON upstream optical signal can be a part of the second time period.

[0055] In an example embodiment, the optical network unit (ONU) of the EPON or the 10G EPON controls the transmission and stop of the upstream optical signal by receiving the downstream optical signal carrying the indication information.

[0056] In an example embodiment, the indication information includes at least one of the following: a physical layer operation management and maintenance (PLOAM) message, a control frame, and a special code word.

[0057] In an example embodiment, the 50G PON downstream optical reflection signal is a 50G PON downstream reflection optical signal with optical power exceeding a preset threshold.

[0058] In the embodiments of the present disclosure, the opening time of the EPON or the 10G EPON ONU can be controlled by the indication information carried by the EPON or the 10G EPON downstream optical signal. The indication information can include a physical layer operation management and maintenance (PLOAM) message, a control frame, or a special code word. The system OLT device or the MAC chip transmits the above indication information to the EPON or the 10G EPON ONU, and the EPON or the 10G EPON ONU controls the opening and closing time of the upstream transmission signal after receiving and analyzing the message.

[0059] By the above steps, at the same time, one of the 50G PON downstream signal and the EPON&10G EPON upstream optical signal is transmitted in the PON optical path, wherein the 50G PON downstream signal includes the 50G PON downstream optical signal and / or the 50G PON downstream optical reflection signal, and the EPON&10G EPON upstream optical signal includes the EPON upstream optical signal and / or the 10G EPON upstream optical signal. The problem that the 50G PON downstream optical reflection of the PON system affects the EPON and 10G EPON upstream service in the related art is solved, and the effect that the 50G PON downstream optical reflection of the PON system avoids affecting the EPON and 10G EPON upstream service is achieved.

[0060] In the embodiments of the present disclosure, the PON optical path refers to the same position in the PON optical path, for example, before the OLT optical module receiver, at the OLT optical module optical port, at a certain optical fiber in the ODN, and the like.

[0061] Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software and the necessary general hardware platform, and of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the embodiments of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk), and includes a plurality of instructions for causing a terminal device (which can be a mobile phone, a computer, a server, or a network device) to execute the method described in the embodiments of the present disclosure.

[0062] In the present embodiment, a PON coexistence device (or system) is also provided, which is configured to implement the above embodiments and preferred embodiments, and will not be described again. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware is also possible and is contemplated.

[0063] FIG. 4 is a structural block diagram of a PON coexistence device according to an embodiment of the present disclosure. As shown in FIG. 4, the PON coexistence device 40 includes an optical line terminal (OLT) 410 and an optical network unit (ONU) 420.

[0064] In the embodiments of the present disclosure, the OLT 410 comprises a time / bandwidth allocation control module, and the ONU 420 comprises an EPON ONU and / or a 10G EPON ONU; the time / bandwidth allocation control module is configured to generate configuration information indicating that the optical signal transmission of the EPON ONU and / or the 10G EPON ONU is turned on or turned off, wherein at the same time, one of the 50G PON downstream signal and the EPON&10G EPON upstream optical signal is transmitted in the PON optical path, the 50G PON downstream signal is a 50G PON downstream optical signal and / or a 50G PON downstream optical reflection signal, and the EPON&10G EPON upstream optical signal is an EPON upstream optical signal and / or a 10G EPON upstream optical signal.

[0065] In one example embodiment, the configuration information is configured to control the OLT to send the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal in a first time period and stop sending the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal outside the first time period; and control the ONU to send the EPON upstream optical signal or the 10G EPON upstream optical signal in a second time period and stop sending the EPON upstream optical signal or the 10G EPON upstream optical signal outside the second time period.

[0066] In one example embodiment, the second time period does not overlap with the first time period.

[0067] In one example embodiment, the second time period overlaps or partially overlaps with the first time period.

[0068] In one embodiment, since it takes a certain time for the 50G PON downstream optical signal to be reflected back to the OLT optical module and it also takes a certain time for the EPON or 10G EPON upstream optical signal to reach the OLT optical module, the first time period and the second time period can overlap or partially overlap, as long as it is ensured that the 50G PON downstream optical reflection signal does not conflict with the EPON or 10G EPON upstream optical signal in the PON optical path at the same time.

[0069] In the embodiments of the present disclosure, in order to ensure that the 50G PON downstream and the EPON or 10G EPON upstream do not conflict, a certain length of protection time interval can be specified after the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal is turned off and before the EPON upstream optical signal and / or the 10G EPON upstream optical signal is turned on.

[0070] In an example embodiment, the first time period is at least one of: a partial time period of one downstream frame signal period of the PON; one or more downstream frame signal periods of the PON. In an example embodiment, the partial time period is at least one of: a time period of a fixed time length; a plurality of time periods of fixed time lengths and continuous; a time period of a non-fixed time length; a plurality of time periods of non-fixed time lengths and discontinuous.

[0071] In an example embodiment, the OLT 410 further comprises: a PON MAC chip and a multi-mode optical module, the multi-mode optical module comprising a 50G PON, an EPON and / or a 10G EPON; the PON MAC chip is independent of the time / bandwidth allocation control module or contained in the time / bandwidth allocation control module; wherein at the same time, one of the 50G PON downstream optical signal and the EPON&10G EPON upstream optical signal is transmitted in the optical path of the multi-mode optical module, the EPON&10G EPON upstream optical signal being an EPON upstream optical signal and / or a 10G EPON upstream optical signal.

[0072] In an example embodiment, the PON MAC chip is configured to generate an enable control signal according to the configuration information and send the enable control signal to the multi-mode optical module; the multi-mode optical module is configured to control the opening or closing of the 50G PON transmitter according to the enable control signal.

[0073] In an example embodiment, in the case that the PON MAC chip contains the time / bandwidth allocation control module, the PON MAC chip is further configured to generate the configuration information.

[0074] In the embodiments of the present disclosure, the time / bandwidth allocation control module can be built-in the PON MAC chip, when the time / bandwidth allocation control module is built-in the PON MAC chip, the calculation of the downstream optical signal opening time, the EPON or upstream non-narrowing 10G EPON ONU opening time is realized by the PON MAC chip.

[0075] In an example embodiment, the PON MAC chip is further configured to convert the configuration information into data information and send the data information to the multi-mode optical module.

[0076] In the embodiments of the present disclosure, the 50G PON downlink optical signal generated by the time / bandwidth allocation control module can also be converted into downlink data information by the PON MAC when the 50G PON optical module or the multi-mode optical module is turned on, and the multi-mode optical module can recognize and generate a 50G PON transmission opening enable control signal by the built-in processing chip to control the 50G PON downlink transmitter to open and close. At this time, the built-in processing chip in the multi-mode optical module needs to contain a cache module to store the downlink data continuously transmitted by the PON MAC.

[0077] In one example embodiment, the multi-mode optical module further comprises a processing chip, a 50G PON laser driver LDD and a 50G PON optical transmitting component TOSA, the processing chip is configured to store and recognize data information, and generate an enable control signal according to the data information to control the 50G PON LDD and the 50G PON TOSA to open or close.

[0078] In one example embodiment, the configuration information is further used to indicate that the uplink optical signal of the 50G PON stops transmitting at the first time period.

[0079] In one example embodiment, the multi-mode optical module further comprises a multi-mode optical receiving component ROSA, and the multi-mode ROSA is configured to receive the uplink optical signal from the EPON, and / or the 10G EPON and the 50G PON, and convert the uplink optical signal into an electrical signal.

[0080] In one example embodiment, the multi-mode optical module further comprises a multiplexing / demultiplexing module, and the multiplexing / demultiplexing module is configured to respectively perform multiplexing / demultiplexing processing on the multi-channel downlink optical signal and the multi-channel uplink optical signal, wherein the multi-channel downlink optical signal comprises the downlink optical signal of the EPON, and / or the downlink optical signal of the 10G EPON and the downlink optical signal of the 50G PON; and the multi-channel uplink optical signal comprises the uplink optical signal of the 50G PON, and / or the uplink optical signal of the EPON and the 10G EPON.

[0081] In one example embodiment, the multiplexing / demultiplexing module is further configured to respectively perform multiplexing / demultiplexing processing on the multi-channel downlink optical signal and the single-channel uplink optical signal, wherein the multi-channel downlink optical signal comprises the downlink optical signal of the EPON, and / or the downlink optical signal of the 10G EPON and the downlink optical signal of the 50G PON; and the single-channel uplink optical signal comprises the uplink optical signal of the EPON, and / or the uplink optical signal of the 10G EPON, and the uplink optical signal of the 50G PON.

[0082] In one example embodiment, in the case that the ONU comprises a 10G EPON uplink narrow ONU and / or a 50G PON ONU, the 50G PON downlink optical signal is configured by the OLT to be in a continuous transmission mode.

[0083] For the embodiments of the present disclosure, when all EPON ONUs and / or 10G EPON uplink non-narrowed ONUs in the coexistence system are replaced by 10G EPON uplink narrowed ONUs or 50G PON ONUs, the 50G PON downstream optical signals can be configured by the OLT device to be in a continuous transmission mode.

[0084] It should be noted that the above modules can be implemented by software or hardware, and for the latter, the following implementation manners can be used, but are not limited thereto: the above modules are located in the same processor; or the above modules are located in different processors in any combination.

[0085] The embodiments of the present disclosure further provide a computer readable storage medium, which stores a computer program, and the computer program is configured to execute the steps in any of the above method embodiments when running.

[0086] In an example embodiment, the above computer readable storage medium can include, but is not limited to, a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store computer programs.

[0087] The embodiments of the present disclosure further provide an electronic device, which includes a memory storing a computer program and a processor configured to execute the computer program to perform the steps in any of the above method embodiments.

[0088] In an example embodiment, the above electronic device can further include a transmission device connected to the processor and an input / output device connected to the processor.

[0089] The embodiments of the present disclosure further provide a computer program product, which includes computer programs / instructions, and the computer programs / instructions are executed by a processor to implement the steps in any of the above method embodiments.

[0090] The specific examples in the present embodiment can refer to the examples described in the above embodiments and example embodiments, and the present embodiment will not be described here again.

[0091] Obviously, those skilled in the art should understand that each module or each step of the above-mentioned embodiments of the present disclosure can be realized by a general computing device, which can be centralized on a single computing device or distributed on a network composed of multiple computing devices, which can be realized by program codes executable by the computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in different order, or they can be manufactured into individual integrated circuit modules, or multiple modules or steps among them can be manufactured into a single integrated circuit module. Thus, the embodiments of the present disclosure are not limited to any specific combination of hardware and software.

[0092] In order for those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the following describes the embodiments in combination with specific scenarios.

[0093] Embodiment one

[0094] In the embodiments of the present disclosure, the PON coexistence method is introduced taking the 125μs PON downlink frame signal period as an example, wherein part of the time period in the 125μs PON downlink frame signal period is taken as the first time period in the above-mentioned embodiments, and the time period in the 125μs PON downlink frame signal period except the first time period is taken as the second time period in the above-mentioned embodiments. In the actual implementation process, different time length of downlink frame signal period can be selected to realize the PON coexistence method of the present disclosure, which is not specifically limited here.

[0095] To solve the problem of 50G PON downlink optical reflection affecting EPON and 10G EPON uplink service, the present disclosure provides a PON coexistence method, and Fig. 5 is a schematic diagram of the principle of the PON coexistence method of the present disclosure, as shown in Fig. 5, which includes the following steps:

[0096] Step S501, in each 125μs PON downlink frame signal period, the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal is turned on for a period of time, and the rest of the time the downlink optical signal or the downlink optical reflection signal is turned off. The system no longer transmits the downlink optical signal or the downlink optical reflection signal, and transmits the downlink service data;

[0097] Step S502, when the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal is turned off in each 125μs PON downlink frame signal period, the EPON ONU and / or the uplink non-narrowed 10G EPON ONU is allowed to transmit the uplink optical signal and the uplink service data. The transmission time slots of different ONUs are determined by the bandwidth allocation of the system to each ONU.

[0098] In an embodiment, in the above step, the opening and closing time length of the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal can be uniformly scheduled by the system OLT device according to the 50G PON downstream service traffic and the EPON and 10G EPON upstream service traffic, and the service priority.

[0099] In an embodiment, in the above step, the opening time of the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal in each 125μs PON downstream frame signal period can be a fixed continuous time period and the time length is configurable, or can be a non-fixed discontinuous multiple time periods. When the opening time of the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal is a fixed continuous time period, the system implementation is relatively simple; when the opening time of the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal is a non-fixed discontinuous multiple time periods, the system bandwidth utilization can be optimized to the highest.

[0100] In an embodiment, since the 50G PON downstream optical signal reflection back to the OLT optical module needs a certain time, and the EPON or 10G EPON upstream optical signal to the OLT optical module also needs a certain time, the first time period and the second time period can be overlapped or partially overlapped, only need to ensure that the 50G PON downstream optical reflection signal is not in conflict with the EPON or 10G EPON upstream optical signal in the PON optical path at the same time. A specific implementation is as follows:

[0101] Fig. 6 is another principle schematic diagram of the PON coexistence method of the embodiment of the present disclosure, as shown in Fig. 6, assuming that t1 is the maximum reflection delay time of the 50G PON downstream optical signal reflection back to the OLT, t2 is the time of the EPON or 10G EPON upstream optical signal transmitted to the OLT through the ODN, the downstream packet length of the 50G PON is T1, the upstream packet length time of the EPON or 10G EPON is T2, and the downstream packet header of the 50G PON is the starting time, T1+t1 is greater than or equal to 2T2+t2.

[0102] In the present example, the t1 time can be obtained in the 50G PON registration stage by reading the OLT optical module receiving optical power size, cooperating with ranging, timing and other mechanisms; the t2 time can be obtained by EPON or 10G EPON ranging.

[0103] The embodiment is an example implementation. When the 50G PON downlink optical signal is inconsistent with the EPON or 10G EPON uplink optical signal packet header start time, for example, the latter is sent late or in advance, the t1, t2, T1, T2 limit conditions are adjusted accordingly. Only need to ensure that the EPON or 10G EPON uplink packet tail and the 50G PON downlink transmission optical packet header do not meet at the same position in the optical path.

[0104] By using the method of the embodiment of the present disclosure, the 50G PON downlink transmission time can be maximized, which is beneficial to improve the bandwidth utilization of the 50G PON downlink.

[0105] Figure 7 is a schematic diagram of the implementation of the opening or closing of the optical signal according to the embodiment of the present disclosure. As shown in Figure 7, the transmission is stopped at the tail of the 125 microsecond superframe. Based on the OLT recovery transmission, the ONU side frame synchronization detection can send a PSync recovery block at the tail of each superframe. The PSync recovery block is used for ONU to recover the downlink clock and retrieve the PSync recovery block to maintain the PSync synchronization state machine. The OLT first transmits the 125-p microsecond at the front of the superframe, including the PSync recovery block, and transmits the service data at the front of the superframe, and then stops transmitting at the p microsecond at the tail of the superframe. The PSync recovery block is transmitted at the end of the p microsecond, and then a new cycle is started again, and the 125-p microsecond at the front of the superframe is transmitted, and the p microsecond at the tail of the superframe is stopped. In the embodiment of the present disclosure, in the case of considering bit interleaving, it is necessary to ensure that the 125-p microsecond transmitted is an integer multiple of 4 FEC code blocks.

[0106] The ONU first receives the 125-p microsecond at the front of the superframe, and stops receiving the p microsecond at the tail of the superframe. Before the end of the p microsecond, the recovery block is received to recover the clock and attempt to search for PSync to maintain the local PSync synchronization state machine, and then the reception of the next superframe is started. When the 50G PON downlink transmission is closed, the 50G PON ONU supports switching from the recovery clock to the hold clock for local data processing and uplink data transmission. In an embodiment, the end of the PSync recovery block can also carry a downlink data end indication bit. After the 50G PON recognizes the indication bit, the recovery clock is switched to the hold clock for local data processing and uplink data transmission.

[0107] In the embodiment of the present disclosure, the opening and closing time of the 50G PON downlink optical signal, and the opening time of the EPON or uplink non-narrow 10G EPON ONU can be uniformly controlled by the system OLT device or the media access control (Media Access Control, MAC) chip.

[0108] In the embodiments of the present disclosure, the opening time of the EPON and / or the uplink of the non-narrowed 10G EPON ONU can be controlled by the indication information carried by the EPON and / or the 10G EPON downlink optical signal. The indication information can include a PLOAM message, a control frame or a special code word. The system OLT device or the MAC chip sends the indication information to the EPON or the 10G EPON ONU, and the EPON or the 10G EPON ONU controls the opening and closing time of the uplink transmission signal after receiving and analyzing the message.

[0109] In the embodiments of the present disclosure, the system OLT device can also ensure that the uplink optical signal opening time period and the downlink optical signal opening time period do not conflict by steps such as ranging, timestamp transmission, time synchronization, and protection time interval setting.

[0110] In the embodiments of the present disclosure, the 50G PON uplink optical signal can be transmitted during the 50G PON downlink optical signal opening or closing period according to the 50G PON bandwidth allocation time slot. Through the embodiments of the present disclosure, the 50G PON uplink service transmission does not occupy its downlink time slot, which is conducive to improving the system bandwidth utilization. During the 50G PON downlink optical signal closing period, the ONU clock module needs to maintain the downlink clock signal for uplink service transmission.

[0111] Embodiment Two

[0112] In the second embodiment, according to the PON coexistence method in the above embodiments, a PON coexistence system supporting the coexistence of EPON, 10G EPON and 50G PON is provided.

[0113] Figure 8 is a structural block diagram of a PON coexistence system according to an embodiment of the present disclosure. As shown in Figure 8, the PON coexistence system includes an OLT central office device, an optical distribution network, and an EPON ONU, a 10G EPON ONU, and a 50G PON ONU. The OLT central office device includes a time / bandwidth allocation control module, a PON MAC, and an EPON&10G EPON&50G PON multimode optical module. The time / bandwidth allocation control module can generate a 50G PON downlink optical signal opening time according to network requirements, an EPON or uplink non-narrowband 10G EPON ONU opening time configuration, and send the configuration to the PON MAC. The PON MAC generates a 50G PON transmission opening enable control signal according to the received configuration information, and sends the control signal to the EPON&10G EPON&50G PON multimode optical module to control the opening and closing time periods of the 50G PON downlink transmitter in the optical module. The PON MAC also generates an EPON or uplink non-narrowband 10G EPON ONU uplink bandwidth allocation period according to the received configuration information, and transmits the uplink bandwidth allocation period to the EPON ONU or uplink non-narrowband 10G EPON ONU through EPON and 10G EPON downlink messages to control the uplink transmission opening time period of the EPON or uplink non-narrowband 10G EPON ONU. This ensures that, at a certain time, only one type of data is transmitted in the optical distribution network in the system bidirectional data transmission, i.e., 50G PON downlink data, EPON uplink data, or uplink non-narrowband 10G EPON uplink data. The EPON&10G EPON&50G PON multimode optical module opens or closes the 50G PON downlink optical transmitter according to the received 50G PON transmission opening enable control signal, and simultaneously completes the optical-electric and optical-electric conversion functions of the EPON, 10G EPON, and 50G PON uplink and downlink.

[0114] In an embodiment of the present disclosure, the optical distribution network includes a backbone optical fiber, an optical splitter, and a plurality of branch optical fibers. The EPON ONU and the 10G EPON ONU extract an uplink transmission time period from the received downlink data, and control the uplink transmission to open and close at a certain time without conflicting with the 10G PON downlink transmission. The 50G PON ONU includes an optical module or device with a downlink burst reception function to correctly receive the 50G PON downlink non-continuous optical signal.

[0115] In the embodiments of the present disclosure, the time / bandwidth allocation control module in the PON coexistence system can be built-in PON MAC. When the time / bandwidth allocation control module is built-in PON MAC, the downlink optical signal opening time, EPON or uplink non-narrow 10G EPON ONU opening time calculation is realized by PON MAC. At this time, the 50G PON sends an opening enable control signal, which is sent to the 50G PON optical module inside the 50G PON downlink transmitter by the PON MAC. Since the 50G PON uplink wavelength partially overlaps with the EPON uplink wavelength, at this time, the external combiner needs to be composed of a splitter, and the 50G PON optical module receiver needs to increase a band-pass filter.

[0116] In the embodiments of the present disclosure, the 50G PON downlink optical signal opening time generated by the time / bandwidth allocation control module can also be converted into downlink data information by the PON MAC to send the 50G PON optical module or the multimode optical module, and the built-in processing chip in the multimode optical module recognizes and generates a 50G PON sending opening enable control signal to control the 50G PON downlink transmitter to open and close. At this time, the built-in processing chip in the multimode optical module needs to contain a cache module to store the downlink data continuously sent by the PON MAC.

[0117] In the embodiments of the present disclosure, the EPON&10G EPON&50G PON multimode optical module can also be composed of independent EPON, 10G EPON, 50G PON modules and external combiners.

[0118] Embodiment three

[0119] In embodiment three, the specific structure and function implementation of the multimode optical module in the above embodiments are expanded. The multimode optical module provided by the embodiments of the present disclosure can realize the opening and closing functions of the 50G PON downlink optical signal, realize the optical and electrical and electrical and optical conversion functions of the EPON, 10G EPON, 50G PON uplink and downlink signals, and realize the combining and splitting functions of the EPON, 10G EPON, 50G PON.

[0120] Figure 9 is a structural schematic diagram of a multi-mode optical module according to an embodiment of the present disclosure. As shown in Figure 9, the multi-mode optical module includes an EPON laser diode driver (LDD), a 10G EPON LDD, and a 50G PON LDD unit, which respectively receive EPON, 10G EPON, and 50G PON downstream data and drive EPON, 10G EPON, and 50G PON transmitter optical sub-assemblies (TOSAs) to implement downstream electro-optical conversion and downstream signal transmission. The 50G PON LDD unit also receives a 50G PON transmission open enable control signal and opens or closes the 50G PON downstream optical transmitter according to the received enable control signal.

[0121] As shown in Figure 9, the EPON & 10G EPON & 50G PON multi-mode optical module further includes a 50G PON receiver optical sub-assembly (ROSA), an EPON & 10G EPON ROSA, which respectively convert received 50G PON and EPON & 10G EPON upstream optical signals into electrical signals and send the electrical signals to a next-stage 50G PON LA and a 50G PON clock and data recovery (CDR) or digital signal processing (DSP) and an EPON & 10G EPON LA for signal amplification and clock recovery.

[0122] As shown in Figure 9, the EPON & 10G EPON & 50G PON multi-mode optical module further includes a multiplexing / demultiplexing module for implementing multiplexing / demultiplexing of three downstream optical signals and two upstream optical signals and implementing multi-directional single-fiber transmission of the optical module. In the multi-mode optical module according to an embodiment of the present disclosure, only one of the 50G PON downstream optical signal and the EPON & 10G EPON upstream optical signal is transmitted in the optical module optical path at the same time.

[0123] Figure 10 is a structural schematic diagram of a multiplexing / demultiplexing module according to an embodiment of the present disclosure. As shown in Figure 10, the multiplexing / demultiplexing module further includes multiplexing / demultiplexer 1, which is configured to implement multiplexing / demultiplexing between 1575-1580nm 10G EPON downstream wavelengths, 1480-1500nm EPON downstream wavelengths, and 1340-1344nm 50G PON downstream wavelengths, 1284-1288nm (or 1260-12800nm, 1290-1310nm) 50G PON upstream wavelengths, and 1260-1360nm EPON&10G EPON upstream wavelengths, to implement single-fiber multi-directional optical ports.

[0124] As shown in Figure 10, the multiplexing / demultiplexing module further includes multiplexing / demultiplexer 2, which is configured to implement multiplexing between 1575-1580nm 10G EPON downstream wavelengths and 1480-1500nm EPON downstream wavelengths.

[0125] As shown in Figure 10, the multiplexing / demultiplexing module further includes a circulator, which is configured to implement multiplexing / demultiplexing between 1340-1344nm 50G PON downstream light and 50G PON upstream light, and EPON&10G EPON upstream light.

[0126] As shown in Figure 10, the multiplexing / demultiplexing module further includes an optical splitter, which is configured to implement splitting of 50G PON upstream light and EPON upstream light.

[0127] As shown in Figure 10, the multiplexing / demultiplexing module further includes a filter, which is configured to filter out EPON&10G EPON optical signals in the 50G PON upstream light path.

[0128] In an embodiment of the present disclosure, the 50G PON CDR / DSP is an optional unit, which can be externally provided in the multi-mode optical module or integrated in a system MAC chip.

[0129] According to an embodiment of the present disclosure, the PON coexistence system provided by the embodiment of the present disclosure can implement isolation of 50G PON downstream optical signals and EPON&upstream non-narrowed 10G EPON upstream optical signals, solve the problem of 50G PON downstream light reflection affecting EPON and 10G EPON upstream services, and support EPON, 10G EPON, and 50G PON three-generation coexistence.

[0130] In an embodiment of the present disclosure, the EPON and 10G EPON downstream transmission mechanism can be a continuous mode, and the EPON and 10G EPON OLT and ONU delivery mechanism, and the EPON and 10G EPON ONU clock recovery processing scheme can remain consistent with the conventional scheme adopted in the related art, without modification.

[0131] Embodiment Four

[0132] In the above embodiments of the present disclosure, the 50G PON downlink opening time is a fixed time in each 125μs PON downlink frame signal period, and the system is relatively simple to implement, but the bandwidth utilization is low.

[0133] In Embodiment Four, the 50G PON downlink opening time can be flexibly controlled according to the actual demand of upstream service bandwidth. For example, it can be opened in a certain or several consecutive 125μs PON downlink frame signal periods, and closed for several periods. Among them, different numbers of 125μs PON downlink frame signal periods are used as the first time period in the above embodiments, and the other 125μs PON downlink frame signal periods except the first time period are used as the second time period in the above embodiments. In the actual implementation process, different time lengths of downlink frame signal periods can be selected to implement the PON coexistence method of the embodiments of the present disclosure, which is not specifically limited here.

[0134] FIG. 11 is another principle schematic diagram of the PON coexistence method of the embodiments of the present disclosure, as shown in FIG. 11, which includes the following steps:

[0135] Step S1101, in one or more 125μs PON downlink frame signal periods, the 50G PON downlink optical signal is opened, and the downlink optical signal is closed in the remaining 125μs PON downlink frame signal periods. The system no longer transmits the downlink optical signal, and transmits the upstream service data.

[0136] Step S1102, when the 50G PON downlink optical signal is closed, the EPON ONU or the uplink non-narrowed 10G EPON ONU is allowed to transmit the uplink optical signal and the upstream service data. The transmission time slots of different ONUs are determined by the bandwidth allocation of the system to each ONU.

[0137] In the embodiments of the present disclosure, in one or more 125μs PON downlink frame signal periods, the 50G PON downlink optical signal is opened, and the downlink optical signal is closed in the remaining 125μs PON downlink frame signal periods.

[0138] FIG. 12 is another principle schematic diagram of the implementation mode of the optical signal opening or closing of the embodiments of the present disclosure, as shown in FIG. 12, several superframes are stopped from being transmitted. Based on the ONU side frame synchronization detection when the OLT resumes transmission, a PSync recovery block can be transmitted at the head of each superframe, and a PSync recovery block is transmitted at the tail, which is used for the ONU to recover the downlink clock and retrieve the PSync to maintain the PSync synchronization state machine.

[0139] OLT first sends N-M superframes, sends service data in the N-M superframes, then stops sending M superframes, in the M superframes, sends a PSync recovery block at the head and a PSync recovery block at the tail, then restarts a new cycle, sends N-M superframes, stops sending M superframe cycles, and so on.

[0140] The ONU first completely receives N-M superframes, then in the M superframe cycles, only identifies the PSync recovery block for maintaining the local PSync synchronization state machine, and in addition to the first superframe cycle of the M superframe cycles, also needs to recover the clock before the PSync recovery block through a recovery block, and obtains the PSync recovery block through searching. After the 50G PON downlink transmission is turned off, the 50GPON ONU supports switching from the recovery clock to the hold clock, which is used for local data processing and uplink data transmission.

[0141] Embodiment five

[0142] In the above embodiments of the present disclosure, the downlink transmission opening or closing is controlled in a 125μs cycle, the control timing sequence of the downlink signal is relatively simple, and the system clock is easy to maintain stable.

[0143] If the bandwidth allocation flexibility needs to be further improved, the 50G PON downlink transmission can be further controlled to open and close at any time, and the opening time needs to be greater than or equal to the time required for 50G PON downlink clock recovery. FIG. 13 is another principle schematic diagram of a PON coexistence method according to an embodiment of the present disclosure. As shown in FIG. 13, when the 50G PON downlink transmission is opened at any time, the EPON or uplink does not narrow the 10G EPON ONU transmission uplink optical signal.

[0144] FIG. 14 is another principle schematic diagram of an implementation mode of optical signal opening or closing according to an embodiment of the present disclosure. As shown in FIG. 14, the transmission is stopped inside the superframe. Based on the frame synchronization detection of the ONU side when the OLT recovers the transmission, a PSync recovery block can be sent at the tail of the superframe (if not at the tail of the superframe, an additional synchronization header needs to be sent, of course, the additional synchronization header can also be a PSync or other code type, such as the synchronization block in the figure, which is used to obtain the data frame start after the ONU recovers the clock), and the recovery block is used for the ONU to recover the downlink clock and retrieve the PSync, so as to maintain the PSync synchronization state machine.

[0145] The OLT divides the 125 microseconds into several 125 / n microseconds, for each 125 / n microseconds, first transmits the front 125 / n-p microseconds, including the synchronization header, transmits the service data in the front, then stops transmitting in the tail p microseconds, of course, needs to transmit the recovery block at the end of the p microseconds, and at other positions of the p microseconds, then restarts the new cycle, transmits the front 125 / n-p microseconds, stops transmitting in the tail p microseconds, and so on.

[0146] In the embodiments of the present disclosure, in the case of considering bit interleaving, it is necessary to ensure that the FEC code blocks transmitted in the 125 / n-p microseconds are 4 integer times.

[0147] The scrambling calculation is restarted at the beginning of each 125 microseconds, and the scrambling calculation is also restarted at the beginning of each 125 / n microseconds. When the start of 125 / n and 125 microseconds does not coincide, the synchronization header can be replaced by other code types.

[0148] The ONU first receives the front 125 / n-p microseconds, stops receiving in the tail p microseconds, receives the recovery block to recover the clock before the end of the p microseconds, and attempts to search for the synchronization header, the synchronization header is PSync at the beginning of each 125 microseconds, to maintain the local PSync synchronization state machine, and then starts receiving the next 125 / n microseconds. After the 50G PON downlink transmission is turned off, the 50G PON ONU supports switching from the recovery clock to the holdover clock, which is used for local data processing and uplink data transmission.

[0149] The PON coexistence method of the above-mentioned embodiment four and embodiment five is also applicable to the PON coexistence system shown in FIG. 8, the structure of the multi-mode optical module shown in FIG. 9, and the structure of the combining and separating module shown in FIG. 10. It should be noted that the difference is only that the time length and division mode of the time period of the PON coexistence method in the embodiment one are different. In actual implementation process, different time length of the downlink frame signal period can be selected to implement the PON coexistence method of the embodiment, wherein the fixed length of the time period of the downlink frame signal period of a certain time length can be used as the first time period, the non-fixed length of the time period of the downlink frame signal period of a certain time length can be used as the first time period, the continuous several time periods of the downlink frame signal period of a certain time length can be used as the first time period, the discontinuous several time periods of the downlink frame signal period of a certain time length can be used as the first time period, one or more downlink frame signal periods of the same time length can be used as the first time period, or one or more downlink frame signal periods of different time lengths can be used as the first time period. In the embodiment, the above-mentioned limitation of the first time period is only for example and is not specifically limited. In the embodiment, the example of the time period is limited in order to express that the 50G PON downlink optical signal and the EPON uplink optical signal or the 10G EPON uplink optical signal are not transmitted at the same time in the same time period.

[0150] Embodiment six

[0151] In the above-mentioned embodiment, the 50G PON downlink opening time does not conflict with the EPON or the uplink non-narrowed 10G EPON opening time. The EPON&10G EPON&50G PON multi-mode optical module needs to separate the 50G PON downlink and the EPON uplink light through the circulator optical path, needs to separate the 50G PON uplink and the EPON uplink light through the optical splitter and the filtering optical path, and the module optical path is relatively complex and has large loss.

[0152] In the embodiment six, the EPON&10G EPON&50G PON multi-mode optical module optical path is greatly simplified, and the module cost is effectively reduced.

[0153] The PON coexistence method provided by the embodiment includes that the 50G PON downlink optical signal is opened in a part of time period and is closed in a part of time period, wherein the EPON, the 10G EPON uplink optical signal and the 50G PON uplink optical signal are transmitted and closed in the 50G PON downlink optical signal opening time period. That is, in the embodiment six, the uplink optical signal of the 50G PON stops transmitting in the first time period.

[0154] In the embodiments of the present disclosure, the partial time period, i.e., the first time period, can be a fixed time within each 125 μs PON downstream frame signal period, or a certain or several continuous 125 μs PON downstream frame signal periods, or an arbitrary time period with an opening time greater than or equal to the time required for 50G PON downstream clock recovery.

[0155] In the embodiments of the present disclosure, the time / bandwidth allocation control module of the PON coexistence system can generate 50G PON downstream optical signal opening time, EPON, 10G EPON and 50G PON ONU opening time configuration according to network requirements. In the embodiments, the EPON&10G EPON&50G PON multimode optical module in the PON coexistence system can adopt different structural designs.

[0156] FIG. 15 is another structural schematic diagram of a multimode optical module according to an embodiment of the present disclosure. As shown in FIG. 15, the multimode optical module includes an EPON LDD, a 10G EPON LDD, and a 50G PON LDD unit, which respectively receive EPON, 10G EPON and 50G PON downstream data and drive the EPON TOSA, 10G EPON TOSA and 50G PON TOSA to realize downstream electro-optical conversion and downstream signal transmission. The 50G PON LDD unit also receives a 50G PON transmission opening enable control signal and opens or closes the 50G PON downstream optical transmitter according to the received enable control signal. The EPON&10G EPON&50G PON multimode optical module further includes an EPON&10G EPON&50G PON ROSA, which respectively converts the received EPON, 10G EPON and 50G PON upstream optical signals into electrical signals and transmits them to the next stage 50G PON LA&CDR / DSP and EPON&10G EPON LA for signal amplification and clock recovery processing.

[0157] As shown in FIG. 15, the multimode optical module further includes a multiplexing / demultiplexing module for realizing multiplexing / demultiplexing of three downstream optical signals and one upstream optical signal, and realizing single-fiber multi-directional transmission of the optical module. In the multimode optical module of the embodiments, at the same time, only one of the 50G PON downstream optical signal, the EPON upstream optical signal, the 10G EPON upstream optical signal and the 50G PON upstream optical signal is transmitted in the optical module optical path. Similarly, the 50G PON CDR / DSP is an optional unit, which can be externally connected to the optical module or integrated into the system MAC chip.

[0158] Figure 16 is another structural schematic diagram of the combining and splitting module of the embodiment of the present disclosure, as shown in Figure 16, the combining and splitting module only includes a single combining and splitting filter and a circulator, effectively simplifying the optical path and reducing the optical path loss. At the same time, the number of upstream receivers is halved, and the cost of the optical module is greatly reduced.

[0159] It should be noted that for the embodiment of the present disclosure, the EPON and 10G EPON downstream transmission mechanism is still in continuous mode, the EPON and 10G EPON OLT and ONU delivery mechanism, and the EPON and 10G EPON ONU clock recovery processing scheme can remain consistent with the traditional scheme and is not modified.

[0160] For the embodiment of the present disclosure, in the system registration phase, the 50G PON ONU registration online can be preferentially guaranteed, at this time the 50G PON downstream optical signal can be continuously transmitted to deliver a stable clock signal to the ONU, and deliver the 50G PON ONU downstream bandwidth allocation time slot. After the 50G PON ONU is registered online, switch to the first time period open and the second time period closed. At this time, the EPON and / or 10G EPON can be registered online in the second time period.

[0161] For the embodiment of the present disclosure, when all EPON ONUs and / or 10G EPON upstream non-narrowed ONUs in the coexistence system are replaced by 10G EPON upstream narrowed ONUs or 50G PON ONUs, the 50G PON downstream optical signal can be configured by the OLT device to be continuously transmitted.

[0162] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modification, equivalent replacement, improvement, etc. within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for coexistence of a passive optical network (PON), comprising: controlling one of a 50Gbit / s PON downstream signal and an EPON&10G EPON upstream optical signal to be transmitted in a PON optical path at a same time, wherein the 50G PON downstream signal comprises a 50G PON downstream optical signal and / or a 50G PON downstream optical reflection signal, and the EPON&10G EPON upstream optical signal comprises an EPON upstream optical signal and / or a 10G EPON upstream optical signal.

2. The method of claim 1, wherein, The controlling one of the 50Gbit / s PON downstream signal and the EPON&10G EPON upstream optical signal to be transmitted in the PON optical path at the same time comprises: controlling an optical line terminal (OLT) to transmit the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal in a first time period and to stop transmitting the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal outside the first time period; and controlling an optical network unit (ONU) to transmit the EPON upstream optical signal or the 10G EPON upstream optical signal in a second time period and to stop transmitting the EPON upstream optical signal or the 10G EPON upstream optical signal outside the second time period. 3.The method of claim 2, wherein the second time period does not overlap with the first time period. 4.The method of claim 2, wherein the second time period overlaps or partially overlaps with the first time period.

5. The method of claim 2, wherein, The first time period is at least one of: a partial time period of one downstream frame signal period of the PON; and one or more downstream frame signal periods of the PON.

6. The method of claim 5, wherein, The partial time period is at least one of: a time period of a fixed time length; and a plurality of time periods of fixed time lengths and in succession. a time period of a non-fixed time length; and a plurality of time periods of non-fixed time lengths and not in succession. 7.The method of claim 2, wherein a time length of the first time period is determined by an optical line terminal (OLT) of a PON system according to service parameter information.

8. The method of claim 7, wherein, The service parameter information comprises at least one of: downstream service traffic of the 50G PON; and upstream service traffic of the EPON or the 10G EPON. service priority of the downstream service of the 50G PON; and service priority of the upstream service of the EPON or the 10G EPON. 9.The method of claim 2, wherein an optical network unit (ONU) of the EPON or the 10G EPON controls transmission and stop of transmission of the upstream optical signal by receiving a downstream optical signal carrying indication information.

10. The method of claim 9, wherein, The indication information comprises at least one of: a physical layer operation administration and maintenance (PLOAM) message; a control frame; and a special code word.

11. The method of claim 2, wherein, Further comprising: the upstream optical signal of the 50G PON is stopped from being transmitted in the first time period.

12. The method of claim 2, wherein, Further comprising: After stopping transmitting the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal in the second time period, a preset protection time interval is passed, and then the EPON upstream optical signal or the 10G EPON upstream optical signal is transmitted.

13. The method of claim 1, wherein, The 50G PON downstream optical reflection signal is a 50G PON downstream reflection optical signal with optical power exceeding a preset threshold.

14. A passive optical network (PON) coexistence apparatus comprising: An optical line terminal (OLT) and an optical network unit (ONU), wherein, The OLT comprises a time / bandwidth allocation control module, and the ONU comprises an EPON ONU and / or a 10G EPON ONU; The time / bandwidth allocation control module is configured to generate configuration information indicating that optical signal transmission of the EPON ONU and / or the 10G EPON ONU is turned on or off, Wherein, at the same time, one of a 50G PON downstream signal and an EPON&10G EPON upstream optical signal is controlled to be transmitted in a PON optical path, the 50G PON downstream signal is a 50G PON downstream optical signal and / or a 50G PON downstream optical reflection signal, and the EPON&10G EPON upstream optical signal is an EPON upstream optical signal and / or a 10G EPON upstream optical signal.

15. The apparatus of claim 14, wherein, The configuration information is configured to, The OLT is controlled to transmit the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal in a first time period and stop transmitting the 50G PON downstream optical signal or the 50G PON downstream optical reflection signal outside the first time period; The ONU is controlled to transmit the EPON upstream optical signal or the 10G EPON upstream optical signal in a second time period and stop transmitting the EPON upstream optical signal or the 10G EPON upstream optical signal outside the second time period.

16. The apparatus of claim 15, wherein, The second time period does not overlap with the first time period.

17. The apparatus of claim 15, wherein, The second time period overlaps or partially overlaps with the first time period.

18. The apparatus of claim 15, wherein, The first time period is at least one of: a partial time period of one downstream frame signal period of a PON; one or more downstream frame signal periods of the PON.

19. The apparatus of claim 18, wherein, The partial time period is at least one of: a time period of a fixed time length; a plurality of time periods of fixed time lengths and in succession; a time period of a non-fixed time length; a plurality of time periods of non-fixed time lengths and not in succession.

20. The apparatus of claim 14, wherein, The OLT further comprises a passive optical network media access control (PON MAC) chip and a multi-mode optical module, and the multi-mode optical module comprises a 50G PON, an EPON and / or a 10G EPON; The PON MAC chip is independent of the time / bandwidth allocation control module or contains the time / bandwidth allocation control module; The 50G PON downstream signal and the EPON & 10G EPON upstream optical signal are transmitted in the optical path of the multimode optical module at the same time.

21. The apparatus of claim 20, wherein, the PON MAC chip is configured to generate an enable control signal according to the configuration information and send the enable control signal to the multimode optical module; the multimode optical module is configured to control the 50G PON transmitter to be turned on or turned off according to the enable control signal.

22. The apparatus of claim 20, wherein, the PON MAC chip is further configured to convert the configuration information into data information and send the data information to the multimode optical module.

23. The apparatus of claim 20, wherein, the multimode optical module further comprises a processing chip, a 50G PON laser driver (LDD) and a 50G PON optical transmitter subassembly (TOSA), the processing chip is configured to store and identify the data information and generate the enable control signal according to the data information to control the 50G PON LDD and 50G PON TOSA to be turned on or turned off.

24. The apparatus of claim 14, wherein, the configuration information is further configured to indicate that the upstream optical signal of the 50G PON is stopped to be sent at the first time period.

25. The apparatus of claim 20, wherein, the multimode optical module further comprises a multimode optical receiver subassembly (ROSA), the multimode ROSA is configured to receive the upstream optical signal from the EPON, and / or the 10G EPON and the 50G PON and convert the upstream optical signal into an electrical signal.

26. The apparatus of claim 20, wherein, the multimode optical module further comprises a multiplexer / demultiplexer module, the multiplexer / demultiplexer module is configured to multiplex / demultiplex a plurality of downstream optical signals and a plurality of upstream optical signals, respectively, wherein, the plurality of downstream optical signals comprise the downstream optical signal of the EPON, and / or the downstream optical signal of the 10G EPON and the downstream optical signal of the 50G PON; the plurality of upstream optical signals comprise the upstream optical signal of the 50G PON, and / or the upstream optical signal of the EPON and the upstream optical signal of the 10G EPON.

27. The apparatus of claim 26, wherein, the multiplexer / demultiplexer module is further configured to, multiplex / demultiplex a plurality of downstream optical signals and one upstream optical signal, respectively, the plurality of downstream optical signals comprise the downstream optical signal of the EPON, and / or the downstream optical signal of the 10G EPON and the downstream optical signal of the 50G PON; the one upstream optical signal is the upstream optical signal of the EPON, and / or the upstream optical signal of the 10G EPON and the upstream optical signal of the 50G PON.

28. The apparatus of claim 14, wherein, in the case that the ONU comprises a 10G EPON upstream narrow ONU and / or a 50G PON ONU, the 50G PON downstream optical signal is configured by the OLT to be in a continuous transmission mode.

29. A computer readable storage medium having stored therein a computer program, wherein, The computer program is executed by a processor to implement the method described in any one of claims 1 to 13.

30. A computer program product comprising computer programs / instructions which, when executed by a processor, implement the method recited in any one of claims 1 to 13.

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