Passive optical network (PON) coexistence method and device

Abstract

The embodiment of the invention provides a passive optical network (PON) coexistence method and device, and the method comprises the steps: controlling a 50G PON downlink signal and an EPONamp at the same moment; one of the 10G EPON uplink optical signals is transmitted in the PON optical path, and the 50G PON downlink signal comprises a 50G PON downlink optical signal and / or a 50G PON downlink optical reflection signal and EPONamp; the 10G EPON uplink optical signal comprises an EPON uplink optical signal and / or a 10G EPON uplink optical signal. According to the invention, the problem that the uplink services of the EPON and the 10G EPON are influenced by the 50G PON downlink light reflection of the PON system in the related technology is solved, and the effect of preventing the uplink services of the EPON and the 10G EPON from being influenced by the 50G PON downlink light reflection of the PON system is achieved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communications, and more specifically, to a method and apparatus for coexistence of passive optical networks (PON). Background Technology

[0002] Passive optical networks (PONs) have undergone three generations of development, originating from early A / B-PONs. The first generation, Gigabit-capable Passive Optical Networks (GPONs) and Ethernet-based Passive Optical Networks (EPONs), have become widely used and have achieved large-scale commercial application. Second-generation 10G-EPON and XG(S)-PON equipment are mature and have been commercially deployed on a large scale. With the development of PON technology, 50Gbit / s passive optical networks (50G PONs) will also begin commercial application. In the early stages of 50G PON commercialization, there will be numerous scenarios where it coexists with traditional PONs.

[0003] The coexistence of 50G PON with traditional PON mainly includes the coexistence and evolution of two systems: EPON and GPON. In the GPON system, the 50G PON wavelength planning Option 3 supports wavelength division multiplexing (WDM) with GPON and XG / XGS-PON, and can be upgraded through external coexistence components (Coexistence Element Type x, CEx) or by integrating multi-mode optical modules (MPMs) into the multiplexer / demultiplexer. However, the uplink wavelength of EPON and the asymmetric, non-narrowing uplink wavelength distribution range of 1260–1360 nm conflict with the downlink operating wavelength of 50G PON (1342+ / -2 nm). In PON (Optical Distribution Network) networks, situations such as suspended fiber optic connectors, dirt, fiber bending, or fiber damage can cause optical signal reflection. This results in the 50G PON downlink operating wavelength being reflected back to the Optical Line Terminal (OLT) optical module and entering the EPON uplink reception, leading to EPON uplink service anomalies.

[0004] In summary, the PON system in the relevant technologies has the problem of 50G PON downlink optical reflection affecting EPON and 10G EPON uplink services. Summary of the Invention

[0005] This invention provides a method and apparatus for coexistence of passive optical networks (PONs) to at least solve the problem in related technologies where the reflection of 50G PON downlink light affects EPON and 10G EPON uplink services.

[0006] According to an embodiment of the present invention, a passive optical network (PON) coexistence method is provided, comprising: controlling one of a 50G PON downlink signal and an EPON & 10G EPON uplink optical signal to be transmitted in the 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.

[0007] According to another embodiment of the present invention, a passive optical network (PON) coexistence device is provided, comprising: an optical line terminal (OLT) and an optical network unit (ONU), wherein the OLT includes a time / bandwidth allocation control module, and the ONU includes an EPONONU and / or a 10G EPON ONU; the time / bandwidth allocation control module is used to generate configuration information indicating whether the optical signal transmission of the EPON ONU and / or the 10G EPON ONU is turned on or off, wherein, at the same time, it controls one of a 50G PON downlink signal and an EPON & 10G EPON uplink optical signal to be transmitted in the PON optical path, wherein the 50G PON downlink signal is a 50G PON downlink optical signal and / or a 50G PON downlink reflected optical signal, and the EPON & 10G EPON uplink optical signal is an EPON uplink optical signal and / or a 10G EPON uplink optical signal.

[0008] According to yet another embodiment of the present invention, a computer-readable storage medium is also provided, wherein a computer program is stored therein, wherein the computer program is configured to perform the steps in any of the above method embodiments when executed.

[0009] According to yet another embodiment of the present invention, a computer program product is also provided, including a computer program / instructions that, when executed by a processor, implement the steps in any of the above method embodiments.

[0010] This invention provides a method for PON coexistence, which simultaneously controls one of the 50G PON downlink signal and the EPON & 10G EPON uplink optical signals to be transmitted in the PON optical path. The 50G PON downlink signal includes the 50G PON downlink optical signal and / or the 50G PON downlink reflected signal, and the EPON & 10G EPON uplink optical signal includes the EPON uplink optical signal and / or the 10G EPON uplink optical signal. This solves the problem in related technologies where the reflection of the 50G PON downlink optical signal in the PON system affects EPON and 10G EPON uplink services, achieving the effect of avoiding the impact of the 50G PON downlink optical signal reflection on EPON and 10G EPON uplink services. Attached Figure Description

[0011] Figure 1 This is a hardware structure block diagram of a mobile terminal for the PON coexistence method according to an embodiment of the present invention.

[0012] Figure 2 This is a flowchart of the PON coexistence method according to an embodiment of the present invention;

[0013] Figure 3 This is another flowchart of the PON coexistence method according to an embodiment of the present invention;

[0014] Figure 4 This is a structural block diagram of a PON coexistence device according to an embodiment of the present invention;

[0015] Figure 5 This is a schematic diagram illustrating the principle of the PON coexistence method according to an embodiment of the present invention;

[0016] Figure 6 This is another schematic diagram illustrating the principle of the PON coexistence method according to an embodiment of the present invention;

[0017] Figure 7 This is a schematic diagram illustrating the principle of how the optical signal is turned on or off according to an embodiment of the present invention.

[0018] Figure 8 This is a structural block diagram of a PON coexistence system according to an embodiment of the present invention;

[0019] Figure 9 This is a schematic diagram of the structure of a multimode optical module according to an embodiment of the present invention;

[0020] Figure 10 This is a schematic diagram of the structure of the combining and splitting module according to an embodiment of the present invention;

[0021] Figure 11 This is another schematic diagram illustrating the principle of the PON coexistence method according to an embodiment of the present invention;

[0022] Figure 12This is another schematic diagram illustrating the principle of how the optical signal is turned on or off according to an embodiment of the present invention;

[0023] Figure 13 This is another schematic diagram illustrating the principle of the PON coexistence method according to an embodiment of the present invention;

[0024] Figure 14 This is another schematic diagram illustrating the principle of how the optical signal is turned on or off according to an embodiment of the present invention;

[0025] Figure 15 This is another structural schematic diagram of the multimode optical module according to an embodiment of the present invention;

[0026] Figure 16 This is another structural schematic diagram of the combining and splitting module in an embodiment of the present invention. Detailed Implementation

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0029] PON technology is a point-to-multipoint (P2MP) broadband access technology based on an ODN network. Uplink and downlink transmission wavelengths are independent, and data is time-division multiplexed (TDM). The network uses a P2MP topology, allowing one PON port to connect multiple Optical Network Units (ONUs), significantly reducing central office resources. Simultaneously, the intermediate ODN network is entirely passive, facilitating construction and expansion, and resulting in low overall costs. Construction and maintenance costs are low, and it is easy to expand and upgrade. PON technology is the most mature broadband fiber optic access technology, offering advantages such as high reliability, high bandwidth, multi-service support, and low cost.

[0030] When EPON, 10GEPON, 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 EPON uplink. Related technologies address this by changing the 50GEPON downlink wavelength to prevent overlap with the EPON uplink wavelength, allowing the OLT optical module's optical path filter to remove reflected signals. However, this solution does not conform to the current 50G PON standard and requires the development of new laser types, which is detrimental to cost reduction and standardization of optical modules.

[0031] The methods and embodiments provided in this invention can be executed on a mobile terminal, a computer terminal, or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal using the PON coexistence method according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0032] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the PON coexistence method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0033] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0034] This invention provides a PON coexistence method. Figure 2 This is a flowchart of the PON coexistence method according to an embodiment of the present invention, as follows: Figure 2 As shown, the process includes the following steps:

[0035] Step S202: At the same time, control one of the 50G PON downlink signal and the EPON & 10G EPON uplink optical signal to be transmitted in the PON optical path.

[0036] In this embodiment of the invention, the 50G PON downlink signal includes a 50G PON downlink optical signal and / or a 50GPON 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.

[0037] Figure 3 This is another flowchart of the PON coexistence method according to an embodiment of the present invention, as follows: Figure 3 As shown, the process includes the following steps:

[0038] Step S302: Control the OLT to send a 50G PON downlink optical signal or a 50G PON downlink optical reflection signal during the first time period, and stop sending the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal outside the first time period.

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

[0040] In one exemplary embodiment, a portion of the time period is at least one of the following: a time period of fixed length; multiple consecutive time periods of fixed length; a time period of non-fixed length; or multiple non-consecutive time periods of non-fixed length. In this embodiment of the invention, different downlink frame signal periods of varying lengths can be selected to implement the PON coexistence method of this embodiment, without specific limitations. For example, a portion of the 125μs PON downlink frame signal period can be used as the first time period in the above embodiment, and the time periods of the 125μs PON downlink frame signal period excluding the first time period can be used as the second time period in the above embodiment. Alternatively, different numbers of 125μs PON downlink frame signal periods can be used as the first time period in the above embodiment, and other 125μs PON downlink frame signal periods excluding the first time period can be used as the second time period in the above embodiment.

[0041] In this embodiment of the invention, the first time period in a downlink frame signal period of different durations can be a fixed, continuous time period with configurable duration, or it can be multiple non-fixed time periods. For example, taking a 125μs PON downlink frame signal period as an example, the 50G PON downlink optical signal on-time in each 125μs PON downlink frame signal period can be a fixed, continuous time period with configurable duration, or it can be multiple non-fixed time periods. When the 50G PON downlink optical signal on-time is a fixed, continuous time period, the system implementation is relatively simple; when the 50G PON downlink optical signal on-time is multiple non-fixed time periods, the system bandwidth utilization can be optimized to the maximum.

[0042] In this embodiment of the invention, to ensure that the 50G PON downlink reflected light does not conflict with the EPON or 10G EPON uplink, after the 50G PON downlink optical signal is turned off and before the EPON uplink optical signal and / or the 10G EPON uplink optical signal is turned on, the system can specify a certain protection time interval.

[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 the 50G PON downlink optical signal may undergo multiple reflections in a PON network, the 50G PON downlink transmitted optical signal is the 50G PON downlink reflected optical signal whose optical power exceeds the set threshold. The set threshold can be determined based on the received optical power of the EPON or 10G EPON uplink optical signal entering the OLT in the PON network.

[0044] In an exemplary embodiment, the duration of the first time period is determined by the optical line terminal (OLT) of the PON system based on service parameter information.

[0045] In one exemplary embodiment, the service parameter information includes at least one of the following: downlink service traffic of 50G PON; uplink service traffic of EPON or 10G EPON; service priority of downlink service of 50G PON; and service priority of uplink service of EPON or 10G EPON.

[0046] In this embodiment of the invention, the opening and closing duration of the 50G PON downlink optical signal can be uniformly scheduled by the system OLT equipment based on the downlink traffic of 50G PON services, the uplink traffic of EPON and 10G EPON services, and the service priority.

[0047] In one exemplary embodiment, during a first time period, the uplink optical signal of the 50G PON stops being transmitted.

[0048] In this embodiment of the invention, the transmission of the 50G PON downlink optical signal is turned on for part of the time period (i.e., the first time period mentioned above) and turned off for part of the time period. During the time period when the 50G PON downlink optical signal is turned on, the transmission of EPON, 10G EPON uplink optical signals and 50G PON uplink optical signals is turned off.

[0049] Step S304: Control the ONU to send EPON uplink optical signals or 10G EPON uplink optical signals during the second time period, and stop sending EPON uplink optical signals or 10G EPON uplink optical signals outside the second time period.

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

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

[0052] In one embodiment, since it takes a certain amount of time for the 50G PON downlink optical signal to be reflected back to the OLT optical module, and it also takes a certain amount of time for the EPON or 10G EPON uplink optical signal to reach the OLT optical module, the first time period and the second time period can overlap or partially overlap. It is only necessary to ensure that the 50G PON downlink optical reflected signal does not conflict with the EPON or 10G EPON uplink optical signal in the PON optical path at the same time.

[0053] In one exemplary embodiment, after the transmission of 50G PON downlink optical signal or 50G PON downlink optical reflection signal is stopped during the second time period, EPON uplink optical signal or 10G EPON uplink optical signal is transmitted again after a preset protection time interval.

[0054] In this embodiment of the invention, the transmission time period of the EPON uplink optical signal or the 10G EPON uplink optical signal may not necessarily occupy the entire second time period; that is, the transmission time period of the EPON uplink optical signal or the 10G EPON uplink optical signal may be a part of the second time period.

[0055] In an exemplary embodiment, the optical network unit (ONU) of EPON or 10G EPON controls the transmission and cessation of uplink optical signals by receiving downlink optical signals carrying indication information.

[0056] In one exemplary embodiment, the indication information includes at least one of the following: a physical layer operation management and maintenance PLOAM message; a control frame; or a special codeword.

[0057] In one exemplary embodiment, the 50G PON downlink optical reflection signal is a 50GPON downlink reflected optical signal with optical power exceeding a preset threshold.

[0058] In this embodiment of the invention, the on-time of the EPON or the uplink non-narrowing 10G EPON ONU can be controlled by indication information carried in the downlink optical signal of the EPON or 10G EPON. This indication information may include Physical Layer Operations, Administration, and Maintenance (PLOAM) messages, control frames, or special codewords. The system OLT device or MAC chip sends the above indication information to the EPON or 10G EPON ONU. Upon receiving and parsing the message, the EPON or 10G EPON ONU controls the on-time and off-time of the uplink transmission signal.

[0059] Through the above steps, at the same time, one of the 50G PON downlink signal and the EPON & 10G EPON uplink optical signals is controlled to be transmitted in the PON optical path. The 50G PON downlink signal includes the 50G PON downlink optical signal and / or the 50G PON downlink reflected signal, and the EPON & 10G EPON uplink optical signal includes the EPON uplink optical signal and / or the 10G EPON uplink optical signal. This solves the problem in related technologies where the reflection of the 50G PON downlink optical signal in the PON system affects EPON and 10G EPON uplink services, achieving the effect of avoiding the impact of the 50G PON downlink optical signal reflection on EPON and 10G EPON uplink services.

[0060] In this embodiment of the invention, the PON optical path refers to the same location in the PON optical path, such as before the OLT optical module receiver, at the optical port of the OLT optical module, or at a certain optical fiber in the ODN.

[0061] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0062] This embodiment also provides a PON coexistence device (or system) for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

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

[0064] In this embodiment of the invention, the OLT 410 includes a time / bandwidth allocation control module, and the ONU 420 includes an EPON ONU and / or a 10G EPON ONU. The time / bandwidth allocation control module is used to generate configuration information indicating whether the optical signal transmission of the EPON ONU and / or the 10G EPON ONU is turned on or off. At the same time, it controls one of the 50G PON downlink signal and the EPON & 10G EPON uplink optical signal to be transmitted in the PON optical path. The 50G PON downlink signal is the 50GPON downlink optical signal and / or the 50G PON downlink optical reflection signal, and the EPON & 10G EPON uplink optical signal is the EPON uplink optical signal and / or the 10G EPON uplink optical signal.

[0065] In one exemplary embodiment, the configuration information is used to control the OLT to transmit a 50G PON downlink optical signal or a 50G PON downlink optical reflection signal in a first time period, and to stop transmitting the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal outside the first time period; and to control the ONU to transmit an EPON uplink optical signal or a 10G EPON uplink optical signal in a second time period, and to stop transmitting the EPON uplink optical signal or the 10G EPON uplink optical signal outside the second time period.

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

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

[0068] In one embodiment, since it takes a certain amount of time for the 50G PON downlink optical signal to be reflected back to the OLT optical module, and it also takes a certain amount of time for the EPON or 10G EPON uplink optical signal to reach the OLT optical module, the first time period and the second time period can overlap or partially overlap. It is only necessary to ensure that the 50G PON downlink optical reflected signal does not conflict with the EPON or 10G EPON uplink optical signal in the PON optical path at the same time.

[0069] In this embodiment of the invention, to ensure that the 50G PON downlink does not conflict with the EPON or 10G EPON uplink, after the 50GPON downlink optical signal or the 50G PON downlink optical reflection signal is turned off, and before the EPON uplink optical signal and / or the 10G EPON uplink optical signal is turned on, the system can specify a certain protection time interval.

[0070] In one exemplary embodiment, the first time period is at least one of the following: a portion of a downlink frame signal period of the PON; or one or more downlink frame signal periods of the PON. In one exemplary embodiment, the portion of the time period is at least one of the following: a time period of fixed length; multiple consecutive time periods of fixed length; a time period of non-fixed length; or multiple non-consecutive time periods of non-fixed length.

[0071] In one exemplary embodiment, the OLT 410 further includes: a passive optical network media access control (PON) MAC chip and a multimode optical module, the multimode optical including 50G PON, EPON and / or 10G EPON; the PON MAC chip is set independently of or included in the time / bandwidth allocation control module; wherein, at the same time, one of the 50G PON downlink optical signal and the EPON & 10G EPON uplink optical signal is transmitted in the optical path of the multimode optical module, and the EPON & 10G EPON uplink optical signal is the EPON uplink optical signal and / or the 10G EPON uplink optical signal.

[0072] In an exemplary embodiment, the PON MAC chip is used to generate an enable control signal based on configuration information and send the enable control signal to the multimode optical module; the multimode optical module is used to control the 50G PON transmitter to turn on or off based on the enable control signal.

[0073] In one exemplary embodiment, where the PON MAC chip includes a time / bandwidth allocation control module, the PON MAC chip is also used to generate configuration information.

[0074] In this embodiment of the invention, the time / bandwidth allocation control module may have a built-in PON MAC chip. When the time / bandwidth allocation control module has a built-in PON MAC chip, the calculation of the downlink optical signal turn-on time and the EPON or uplink non-narrowing 10G EPONONU turn-on time is implemented by the PON MAC chip.

[0075] In one exemplary embodiment, the PON MAC chip is also used to convert configuration information into data information and send the data information to the multimode optical module.

[0076] In this embodiment of the invention, when the 50G PON downlink optical signal generated by the time / bandwidth allocation control module is turned on, it can also be converted into downlink data information via PON MAC and sent to the 50G PON optical module or multimode optical module. The built-in processing chip in the multimode optical module identifies and generates a 50G PON transmit enable control signal to control the 50G PON downlink transmitter to turn on and off. At this time, the built-in processing chip in the multimode optical module needs to include a buffer module to store the downlink data continuously transmitted by the PON MAC.

[0077] In one exemplary embodiment, the multimode optical module further includes a processing chip, a 50G PON laser driver LDD, and a 50G PON optical transmitter assembly TOSA. The processing chip is used to store and identify data information and generate an enable control signal based on the data information to control the 50G PON LDD and 50G PON TOSA to be turned on or off.

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

[0079] In one exemplary embodiment, the multimode optical module further includes a multimode optical receiver assembly (ROSA) for receiving uplink optical signals from EPON, and / or 10G EPON and 50G PON, and converting the uplink optical signals into electrical signals.

[0080] In one exemplary embodiment, the multimode optical module further includes a multiplexing / demultiplexing module, which is used to perform multiplexing / demultiplexing processing on multiple downlink optical signals and multiple uplink optical signals respectively. The multiple downlink optical signals include downlink optical signals of EPON, and / or downlink optical signals of 10G EPON and downlink optical signals of 50G PON; the multiple uplink optical signals include uplink optical signals of 50GPON, and / or uplink optical signals of EPON and 10G EPON.

[0081] In an exemplary embodiment, the multiplexing / demultiplexing module is further configured to perform multiplexing / demultiplexing processing on multiple downlink optical signals and one uplink optical signal, respectively. The multiple downlink optical signals include EPON downlink optical signals, and / or 10G EPON downlink optical signals and 50G PON downlink optical signals; the one uplink optical signal is EPON, and / or 10G EPON uplink optical signals, and 50G PON uplink optical signals.

[0082] In one exemplary embodiment, when the ONU includes a 10G EPON uplink narrowing ONU and / or a 50G PON ONU, the 50G PON downlink optical signal is configured by the OLT to be transmitted in continuous mode.

[0083] In the above embodiments of the present invention, when all EPON ONUs and / or 10G EPON uplink non-narrowing ONUs in the coexistence system are replaced with 10G EPON uplink narrowing ONUs or 50G PON ONUs, the 50G PON downlink optical signal can be configured to a continuous transmission mode through the OLT device.

[0084] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0085] Embodiments of the present invention also provide a computer-readable storage medium storing a computer program, wherein the computer program is configured to perform the steps in any of the above method embodiments when executed.

[0086] In one exemplary embodiment, the aforementioned computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard disk, magnetic disk, or optical disk.

[0087] Embodiments of the present invention also provide an electronic device including a memory and a processor, the memory storing a computer program and the processor being configured to run the computer program to perform the steps in any of the above method embodiments.

[0088] In one exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.

[0089] Embodiments of the present invention also provide a computer program product, including a computer program / instructions, which, when executed by a processor, implement the steps in any of the above method embodiments.

[0090] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

[0091] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0092] To enable those skilled in the art to better understand the technical solution of the present invention, the following description is provided in conjunction with specific scenario embodiments.

[0093] Example 1

[0094] In this embodiment of the invention, a 125μs PON downlink frame signal period is used as an example to describe the PON coexistence method of this embodiment. A portion of the 125μs PON downlink frame signal period is designated as the first time period in the above embodiment, and the remaining portion of the 125μs PON downlink frame signal period excluding the first time period is designated as the second time period in the above embodiment. In actual implementation, downlink frame signal periods of different lengths can be selected to implement the PON coexistence method of this embodiment; no specific limitations are imposed here.

[0095] To address the issue of 50G PON downlink optical reflection affecting EPON and 10G EPON uplink services, this invention proposes a PON coexistence method. Figure 5 This is a schematic diagram illustrating the principle of the PON coexistence method according to an embodiment of the present invention, as shown below. Figure 5 As shown, it includes the following steps:

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

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

[0098] In one embodiment, the opening and closing duration of the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal in the above steps can be uniformly scheduled by the system OLT equipment according to the downlink traffic of 50G PON service, the uplink traffic of EPON and 10G EPON, and the service priority.

[0099] In one embodiment, in the above steps, the on-time of the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal in each 125μs PON downlink frame signal period can be a fixed, continuous time period with configurable duration, or it can be multiple non-fixed time periods. When the on-time of the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal is a fixed, continuous time period, the system implementation is relatively simple; when the on-time of the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal is multiple non-fixed time periods, the system bandwidth utilization can be optimized to the maximum.

[0100] In one embodiment, since it takes a certain amount of time for the 50G PON downlink optical signal to reflect back to the OLT optical module, and also a certain amount of time for the EPON or 10G EPON uplink optical signal to reach the OLT optical module, the first time period and the second time period can overlap or partially overlap. It is only necessary to ensure that the 50G PON downlink optical signal does not conflict with the EPON or 10G EPON uplink optical signal in the PON optical path at the same time. A specific implementation is as follows:

[0101] Figure 6 This is another schematic diagram illustrating the principle of the PON coexistence method according to an embodiment of the present invention, as shown below. Figure 6 As shown, assuming t1 is the maximum reflection delay time of the 50GPON downlink optical signal reflected back to the OLT, t2 is the time for the EPON or 10G EPON uplink optical signal to be transmitted to the OLT through the ODN, the downlink packet length of 50G PON is T1, and the uplink packet length of EPON or 10G EPON is T2, taking the 50GPON downlink packet header as the starting time, T1+t1 is greater than or equal to 2T2+t2.

[0102] In this example, time t1 can be obtained during the 50G PON registration phase by reading the received optical power of the OLT optical module in conjunction with ranging, timing and other mechanisms; time t2 can be obtained through EPON or 10G EPON ranging.

[0103] This embodiment is an exemplary implementation. When the start time of the 50G PON downlink optical transmission signal is inconsistent with that of the EPON or 10G EPON uplink optical signal packet, for example, the latter is sent later or earlier, the above-mentioned t1, t2, T1, T2 constraints are adjusted accordingly. It is only necessary to ensure that the EPON or 10G EPON uplink packet tail and the 50G PON downlink transmission optical packet head do not meet at the same position in the optical path.

[0104] Using the method of this embodiment of the invention, the downlink transmission time of 50G PON can be maintained to the maximum extent, which is beneficial to improving the bandwidth utilization of 50GPON downlink.

[0105] Figure 7 This is a schematic diagram illustrating the principle of how the optical signal is turned on or off according to an embodiment of the present invention. Figure 7 As shown, transmission stops at the end of the 125-microsecond superframe. Based on OLT resumption of transmission and ONU-side frame synchronization detection, a PSync recovery block can be sent at the end of each superframe. This PSync recovery block is used by the ONU to restore the downlink clock and retrieve the PSync recovery block to maintain the PSync synchronization state machine. The OLT first sends the first 125-p microseconds of the superframe, including the PSync recovery block, placing the service data at the beginning of the superframe. Then, transmission stops at the end of the p-microseconds of the superframe, and the PSync recovery block is sent at the end of the p-microseconds. Then, a new cycle begins, sending the first 125-p microseconds of the superframe, stopping the transmission of the end p-microseconds, and so on. In this embodiment of the invention, considering bit interleaving, it is necessary to ensure that the FEC code blocks transmitted within 125-p microseconds are multiples of 4.

[0106] The ONU first receives the first 125 p microseconds of the superframe, then stops receiving the last p microseconds. Before the p microseconds end, it receives the recovery block recovery clock and attempts to search for PSync to maintain the local PSync synchronization state machine, then begins receiving the next superframe. When 50GPON downlink transmission is disabled, the 50G PON ONU supports switching from the recovery clock to the hold clock for local data processing and uplink data transmission. In one embodiment, the PSync recovery block may also carry a downlink data end indicator bit. Upon recognizing the indicator bit, the 50G PON switches from the recovery clock to the hold clock for local data processing and uplink data transmission.

[0107] In this embodiment of the invention, the on / off time of the 50G PON downlink optical signal and the on / off time of the EPON or uplink non-narrowing 10GEPON ONU can be uniformly controlled by the system OLT device or the Media Access Control (MAC) chip.

[0108] In this embodiment of the invention, the on-time of the EPON and / or the uplink non-narrowing 10G EPON ONU can be controlled by indication information carried in the EPON and / or 10G EPON downlink optical signals. This indication information may include PLOAM messages, control frames, or special codewords. The system OLT device or MAC chip sends the aforementioned indication information to the EPON or 10G EPON ONU. Upon receiving and parsing the message, the EPON or 10G EPON ONU subsequently controls the on and off times of the uplink transmission signal.

[0109] In this embodiment of the invention, 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 through steps such as ranging, timestamp transmission, time synchronization, and protection time interval setting.

[0110] In this embodiment of the invention, the 50G PON uplink optical signal can be transmitted during the 50G PON downlink optical signal on or off cycle according to the 50G PON bandwidth allocation time slot. Through this embodiment, 50G PON uplink service transmission does not occupy its downlink time slot, which is beneficial for improving system bandwidth utilization. During the 50G PON downlink optical signal off cycle, the ONU clock module needs to maintain the downlink clock signal for uplink service transmission.

[0111] Example 2

[0112] In Embodiment 2, based on the PON coexistence method in the above embodiments, a PON coexistence system supporting the coexistence of three generations of EPON, 10G EPON and 50G PON is provided.

[0113] Figure 8 This is a structural block diagram of a PON coexistence system according to an embodiment of the present invention, as shown below. Figure 8As shown, the PON coexistence system includes: OLT central office equipment, optical distribution network, and EPON ONU, 10G EPON ONU, and 50G PON ONU. The OLT central office equipment includes a time / bandwidth allocation control module, a PON MAC, and EPON & 10G EPON & 50G PON multimode optical modules. The time / bandwidth allocation control module can generate the 50G PON downlink optical signal turn-on time and the EPON or uplink non-narrowing 10G EPON ONU turn-on time configuration according to network requirements, and send it to the PON MAC. The PON MAC generates a 50G PON transmit enable control signal based on the received configuration information and sends it to the EPON & 10G EPON & 50G PON multimode optical modules to control the turn-on and turn-off time periods of the 50G PON downlink transmitter in the optical modules. The PON MAC also generates the uplink bandwidth allocation period for the EPON or 10G EPON ONU without uplink narrowing based on the received configuration information. This period is transmitted to the EPON ONU or 10G EPON ONU without uplink narrowing via EPON and 10G EPON downlink messages, controlling the uplink transmission start time period of the EPON or 10G EPON ONU without uplink narrowing. This ensures that at any given time, only one type of data—50G PON downlink data, EPON uplink data, or 10G EPON uplink data without uplink narrowing—is transmitted in the optical distribution network during bidirectional data transmission. The EPON&10G EPON&50G PON multimode optical module turns the 50G PON downlink optical transmitter on or off based on the received 50GPON transmit enable control signal, simultaneously performing optoelectronic and optoelectronic conversion functions for EPON, 10G EPON, and 50GPON uplink and downlink.

[0114] In this embodiment of the invention, the optical distribution network includes a backbone fiber, a splitter, and several branch fibers. The EPON ONU and 10G EPON ONU extract the uplink transmission time period from the received downlink data and control the uplink transmission to open and close, ensuring that it does not conflict with the 10G PON downlink transmission at a certain time. The 50G PON ONU includes an optical module or device with downlink burst reception capability to correctly receive 50G PON downlink discontinuous optical signals.

[0115] In this embodiment of the invention, the time / bandwidth allocation control module in the aforementioned PON coexistence system can have a built-in PONMAC. When the time / bandwidth allocation control module has a built-in PONMAC, the downlink optical signal turn-on time and the EPON or uplink non-narrowing 10G EPON ONU turn-on time calculation are implemented by the PONMAC. At this time, the 50G PON sends an enable control signal, which is sent by the PONMAC to the 50G PON downlink transmitter inside the 50G PON optical module. Since the 50G PON uplink wavelength partially overlaps with the EPON uplink wavelength, the external multiplexer needs to be composed of a splitter, and the 50G PON optical module receiver needs to add a bandpass filter.

[0116] In this embodiment of the invention, when the 50G PON downlink optical signal generated by the time / bandwidth allocation control module is turned on, it can also be converted into downlink data information via PON MAC and sent to the 50G PON optical module or multimode optical module. The built-in processing chip in the multimode optical module identifies and generates a 50G PON transmit enable control signal to control the 50G PON downlink transmitter to turn on and off. At this time, the built-in processing chip in the multimode optical module needs to include a buffer module to store the downlink data continuously transmitted by the PON MAC.

[0117] In this embodiment of the invention, the EPON&10G EPON&50G PON multimode optical module can also be composed of independent EPON, 10G EPON, 50G PON modules and an external multiplexer.

[0118] Example 3

[0119] In Embodiment 3, the specific structure and functional implementation of the multimode optical module in the above embodiments will be described in detail. The multimode optical module provided by this embodiment of the invention can realize the opening and closing function of 50G PON downlink optical signal, realize the optical-electrical and electrical-optical conversion function of uplink and downlink signals of EPON, 10G EPON, and 50G PON, and realize the multiplexing and demultiplexing function of EPON, 10G EPON, and 50G PON.

[0120] Figure 9 This is a structural schematic diagram of a multimode optical module according to an embodiment of the present invention, as shown below. Figure 9As shown, the multimode optical module includes an EPON laser diode driver (LDD), a 10G EPON LDD, and a 50G PON LDD unit. These units receive downlink data from EPON, 10G EPON, and 50G PON, respectively, and drive the EPON Transmitter Optical Sub-Assembly (TOSA), 10G EPON TOSA, and 50G PON TOSA to achieve downlink electro-optical conversion and downlink signal transmission. The 50G PON LDD unit also receives a 50G PON transmit enable control signal and turns the 50G PON downlink optical transmitter on or off based on the received enable control signal.

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

[0122] like Figure 9 As shown, the EPON&10G EPON&50G PON multimode optical module also includes a multiplexing / demultiplexing module for multiplexing / demultiplexing three downlink optical signals and two uplink optical signals, enabling multidirectional transmission on a single fiber of the optical module. In the multimode optical module of this embodiment, at any given time, only one of the 50G PON downlink optical signal and the EPON&10G EPON uplink optical signal is transmitted in the optical path of the optical module.

[0123] Figure 10 This is a schematic diagram of the structure of the multiplexing / splitting module according to an embodiment of the present invention, as shown below. Figure 10As shown, the multiplexing / splitting module also includes a multiplexer / splitter 1, used to achieve multiplexing / splitting between two bands: 1575-1580nm 10G EPON downlink wavelength, 1480-1500nm EPON downlink wavelength, 1340-1344nm 50G PON downlink wavelength, 1284-1288nm (or 1260-12800nm, 1290-1310nm) 50G PON uplink wavelength, and 1260-1360nm EPON & 10G EPON uplink wavelength, realizing multi-directional optical output on a single fiber.

[0124] like Figure 10 As shown, the multiplexing / demultiplexing module also includes a multiplexer / demultiplexer 2, used to achieve multiplexing of the 1575-1580nm 10G EPON downlink wavelength and the 1480-1500nm EPON downlink wavelength.

[0125] like Figure 10 As shown, the multiplexing / demultiplexing module also includes a circulator for multiplexing / demultiplexing 1340–1344nm 50G PON downlink and 50GPON uplink, EPON & 10G EPON uplink.

[0126] like Figure 10 As shown, the multiplexing / demultiplexing module also includes a splitter for splitting 50G PON uplink and EPON uplink.

[0127] like Figure 10 As shown, the multiplexing / splitting module also includes a filter for filtering out EPON & 10GEPON optical signals in the 50G PON uplink optical path.

[0128] In this embodiment of the invention, the 50G PON CDR / DSP is an optional unit that can be externally placed in a multimode optical module or integrated into a system MAC chip.

[0129] According to the above embodiments of the present invention, the PON coexistence system provided by the present invention can achieve isolation between 50G PON downlink optical signals and EPON & 10G EPON uplink optical signals without narrowing, solve the problem of 50G PON downlink optical reflection affecting EPON and 10G EPON uplink services, and support the coexistence of EPON, 10G EPON and 50G PON.

[0130] In this embodiment of the invention, the downlink transmission mechanism of EPON and 10G EPON can be a continuous mode, the delivery mechanism of EPON and 10G EPON OLT and ONU, and the clock recovery processing scheme of EPON and 10G EPON ONU can remain consistent with the traditional schemes used in related technologies without modification.

[0131] Example 4

[0132] In the above embodiments of the present invention, the 50G PON downlink turn-on time is a fixed time within each 125μs PON downlink frame signal period. The system implementation is relatively simple, but the bandwidth utilization is low.

[0133] In Embodiment 4, the 50G PON downlink activation time can be flexibly controlled according to the actual uplink service bandwidth requirements. For example, it can be activated during one or more consecutive 125μs PON downlink frame signal cycles and deactivated during several cycles. Specifically, different numbers of 125μs PON downlink frame signal cycles are used as the first time period in the above embodiment, and other 125μs PON downlink frame signal cycles excluding the first time period are used as the second time period in the above embodiment. In actual implementation, downlink frame signal cycles of different lengths can be selected to implement the PON coexistence method of this invention; no specific limitations are imposed here.

[0134] Figure 11 This is another schematic diagram illustrating the principle of the PON coexistence method according to an embodiment of the present invention, as shown below. Figure 11 As shown, it includes the following steps:

[0135] In step S1101, during one or more 125μs PON downlink frame signal cycles, the 50G PON downlink optical signal is turned on, and the downlink optical signal is turned off during the remaining 125μs PON downlink frame signal cycles. The system no longer sends downlink optical signals and transmits downlink service data.

[0136] In step S1102, when the 50G PON downlink optical signal is turned off, the EPON ONU or the uplink-unrestricted 10G EPON ONU is allowed to transmit uplink optical signals and uplink service data. The transmission time slots of different ONUs are determined by the system's bandwidth allocation for each ONU.

[0137] In this embodiment of the invention, the 50G PON downlink optical signal is turned on during one or more 125μs PON downlink frame signal cycles, and the downlink optical signal is turned off during the remaining 125μs PON downlink frame signal cycles.

[0138] Figure 12 This is another schematic diagram illustrating the principle of how the optical signal is turned on or off according to an embodiment of the present invention, such as... Figure 12 As shown, several superframes are stopped from being sent. Based on the ONU-side frame synchronization detection during OLT resumption of transmission, a PSync recovery block can be sent at the beginning and end of each superframe. This PSync recovery block is used by the ONU to restore the downlink clock and retrieve PSync to maintain the PSync synchronization state machine.

[0139] The OLT first sends NM superframes, placing the service data in these superframes for transmission. Then it stops sending M superframes. In these M superframes, a PSync recovery block is sent at the beginning and end. Then it restarts a new cycle, sending NM superframes, stopping sending M superframes, and so on.

[0140] The ONU first receives NM superframes completely. Then, in the subsequent M superframe cycles, it only identifies the PSync recovery block to maintain the local PSync synchronization state machine. Except for the first superframe cycle of the M superframe cycles, the recovery clock needs to be restored before the PSync recovery block, and the PSync recovery block is obtained through a search. After 50G PON downlink transmission is disabled, the 50G PON ONU supports switching from the recovery clock to the hold clock for local data processing and uplink data transmission.

[0141] Example 5

[0142] In the above embodiments of the present invention, the downlink transmission is turned on or off in a 125μs period, the control timing requirements of the downlink signal are relatively simple, and it is easy to maintain the stability of the system clock.

[0143] To further enhance bandwidth allocation flexibility, the 50G PON downlink transmission can be turned on and off at any time, with the on time being greater than or equal to the time required for 50G PON downlink clock recovery. Figure 13 This is another schematic diagram illustrating the principle of the PON coexistence method according to an embodiment of the present invention, as shown below. Figure 13 As shown, when 50G PON downlink transmission is enabled at any time, EPON or uplink non-narrowing 10G EPON ONU uplink optical signal transmission is disabled.

[0144] Figure 14 This is another schematic diagram illustrating the principle of how the optical signal is turned on or off according to an embodiment of the present invention, such as... Figure 14 As shown, transmission stops within the superframe. Based on ONU-side frame synchronization detection during OLT resumption of transmission, a PSync recovery block can be sent at the end of the superframe (if not at the end of the superframe, an additional synchronization header needs to be sent; of course, the additional synchronization header can also be PSync or other code patterns, as shown in the synchronization block in the figure, used by the ONU to obtain the start of the data frame after clock recovery). This recovery block is used by the ONU to recover the downlink clock and retrieve PSync to maintain the PSync synchronization state machine.

[0145] OLT divides 125 microseconds into several 125 / n microseconds. For each 125 / n microsecond, the first 125 / np microseconds, including the synchronization header, are sent first, and the service data is sent at the beginning. Then the last p microseconds are stopped. Of course, a recovery block needs to be sent at the end of the p microseconds, and at other positions in the p microseconds. Then a new cycle is started, the first 125 / np microseconds are sent, and the last p microseconds are stopped, and so on.

[0146] In this embodiment of the invention, considering bit interleaving, it is necessary to ensure that the FEC code blocks transmitted within 125 / np microseconds are multiples of 4.

[0147] The scrambling code calculation must restart every 125 microseconds, and also every 125 / n microseconds. If the start of 125 / n and 125 microseconds do not coincide, the synchronization header can be replaced with another code pattern.

[0148] The ONU first receives the first 125 / np microseconds, then stops receiving the last p microseconds. Before the p microseconds end, it receives the recovery block recovery clock and attempts to search for the synchronization header. At the beginning of each 125 microsecond period, the synchronization header is PSync to maintain the local PSync synchronization state machine. Then, it begins receiving the next 125 / n microseconds. After 50G PON downlink transmission is disabled, the 50G PON ONU supports switching from the recovery clock to the hold clock for local data processing and uplink data transmission.

[0149] The PON coexistence methods described in Embodiments 4 and 5 above are also applicable to... Figure 8 The PON coexistence system shown Figure 9 The structure of the multimode optical module shown Figure 10The structure of the multiplexing / demultiplexing module shown is different from that in the PON coexistence method in Embodiment 1, only in the length and division of the time period. In actual implementation, as described in the above embodiments, different downlink frame signal periods can be selected to implement the PON coexistence method of this embodiment. The first time period can be a fixed length of a downlink frame signal period, a non-fixed length of a downlink frame signal period, several consecutive time periods of a downlink frame signal period, several discontinuous time periods of a downlink frame signal period, one or more downlink frame signal periods of the same length, or one or more downlink frame signal periods of different lengths. In this embodiment, the above limitation on the first time period is merely illustrative and not a specific limitation. The limitation on the time period in this embodiment is to illustrate that within the same time period, the 50G PON downlink optical signal and the EPON uplink optical signal or the 10G EPON uplink optical signal are not transmitted simultaneously.

[0150] Example 6

[0151] In the above embodiments of the present invention, the 50G PON downlink turn-on time does not conflict with the EPON or the uplink non-narrowing 10G EPON turn-on time. The EPON&10G EPON&50G PON multimode optical module requires a circulator optical path to separate the 50G PON downlink and EPON uplink optical, and requires a splitter and a filter optical path to separate the 50G PON uplink and EPON uplink optical. The module optical path is relatively complex and has high loss.

[0152] In Example 6, the optical path of the EPON&10G EPON&50G PON multimode optical module is greatly simplified, effectively reducing the module cost.

[0153] The PON coexistence method provided in this embodiment of the invention includes: 50G PON downlink optical signal transmission is turned on for part of the time period and turned off for part of the time period, wherein, during the time period when the 50G PON downlink optical signal is turned on, EPON, 10G EPON uplink optical signal and 50G PON uplink optical signal transmission are turned off. That is, in embodiment six, during the first time period, the 50G PON uplink optical signal is stopped from being transmitted.

[0154] In this embodiment of the invention, the aforementioned partial time period, namely the first time period, can be a fixed time within each 125μs PON downlink frame signal period, or one or more consecutive 125μs PON downlink frame signal periods, or any time period in which the opening time is greater than or equal to the time required for 50G PON downlink clock recovery.

[0155] In this embodiment of the invention, the time / bandwidth allocation control module of the PON coexistence system can generate the 50GPON downlink optical signal turn-on time, EPON, 10G EPON, and 50G PON ONU turn-on time configuration according to network requirements. In this embodiment, the EPON, 10G EPON, and 50G PON multimode optical modules in the PON coexistence system can adopt different structural designs.

[0156] Figure 15 This is another structural schematic diagram of the multimode optical module according to an embodiment of the present invention, such as... Figure 15 As shown, the multimode optical module includes EPON LDD, 10G EPON LDD, and 50G PON LDD units, which receive EPON, 10G EPON, and 50G PON downlink data, respectively, and drive EPON TOSA, 10G EPON TOSA, and 50G PON TOSA to perform downlink electro-optical conversion and downlink signal transmission. The 50G PON LDD unit also receives a 50G PON enable control signal and turns the 50G PON downlink optical transmitter on or off according to the received enable control signal. The EPON&10G EPON&50G PON multimode optical module also includes EPON&10G EPON&50G PON ROSA, which converts the received EPON, 10G EPON, and 50G EPON uplink optical signals into electrical signals and sends them to the next-level 50G PON LA&CDR / DSP and EPON&10G EPON LA for signal amplification and clock recovery.

[0157] like Figure 15 As shown, the multimode optical module also includes a multiplexing / demultiplexing module for multiplexing / demultiplexing three downlink optical signals and one uplink optical signal, enabling single-fiber multidirectional transmission at the optical module's optical port. In this embodiment of the multimode optical module, at any given time, only one of the 50G PON downlink optical signal, EPON uplink optical signal, 10G EPON uplink optical signal, and 50G PON uplink optical signal is transmitted in the optical module's optical path. Similarly, the aforementioned 50G PON CDR / DSP is an optional unit, which can be externally mounted on the optical module or integrated into the system MAC chip.

[0158] Figure 16 This is another structural schematic diagram of the combining and splitting module according to an embodiment of the present invention, as shown below. Figure 16As shown, the multiplexing / demultiplexing module consists of only a single multiplexer / demultiplexer and a circulator, effectively simplifying the optical path and reducing optical path loss. At the same time, the number of uplink receivers is halved, significantly reducing the cost of the optical module.

[0159] It should be noted that, for the embodiments of the present invention, the downlink transmission mechanism of EPON and 10G EPON remains in continuous mode, and the delivery mechanism of EPON and 10G EPON OLT and ONU, as well as the clock recovery processing scheme of EPON and 10G EPON ONU, can remain consistent with the traditional scheme without modification.

[0160] In the above embodiments of the present invention, during the system registration phase, priority is given to ensuring the registration and online launch of the 50G PON ONU. At this time, the 50G PON downlink optical signal can be continuously transmitted to deliver a stable clock signal to the ONU and to transmit the downlink bandwidth allocation time slot for the 50G PON ONU. After the 50G PON ONU is registered and online, the system switches to being open in the first time period and closed in the second time period. At this time, EPON and / or 10G EPON can be registered and online in the second time period.

[0161] In the above embodiments of the present invention, when all EPON ONUs and / or 10G EPON uplink non-narrowing ONUs in the coexistence system are replaced with 10G EPON uplink narrowing ONUs or 50G PON ONUs, the 50G PON downlink optical signal can be configured to a continuous transmission mode through the OLT device.

[0162] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for coexistence in a passive optical network (PON), characterized in that, include: At the same time, control one of the 50G PON downlink signal and the EPON & 10G EPON uplink optical signal of the 50Gbit / s passive optical network to be transmitted in the PON optical path, wherein the 50G PON downlink signal includes the 50G PON downlink optical signal and / or the 50GPON downlink optical reflection signal, and the EPON & 10G EPON uplink optical signal includes the EPON uplink optical signal and / or the 10G EPON uplink optical signal.

2. The method according to claim 1, characterized in that, The simultaneous control of one of the 50G PON downlink signal and the EPON & 10G EPON uplink optical signal in the PON optical path includes: The control optical line terminal (OLT) sends the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal during the first time period, and stops sending the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal outside the first time period. The control optical network unit (ONU) transmits the EPON uplink optical signal or the 10G EPON uplink optical signal during the second time period, and stops transmitting the EPON uplink optical signal or the 10G EPON uplink optical signal outside the second time period.

3. The method according to claim 2, characterized in that, in, The second time period does not overlap with the first time period.

4. The method according to claim 2, characterized in that, in, The second time period overlaps with or partially overlaps with the first time period.

5. The method according to claim 2, characterized in that, in, The first time period is at least one of the following: A portion of a downlink frame signal period in PON; One or more downlink frame signal periods of the PON.

6. The method according to claim 5, characterized in that, in, The specified time period is at least one of the following: A time period of fixed length; Multiple consecutive time periods of fixed length; A time period with a non-fixed duration; Multiple non-fixed and discontinuous time periods.

7. The method according to claim 2, characterized in that, in, The length of the first time period is determined by the optical line terminal (OLT) of the PON system based on service parameter information.

8. The method according to claim 7, characterized in that, The business parameter information includes at least one of the following: Downlink traffic of 50G PON; Uplink traffic of EPON or 10G EPON; Service priority of downlink services in 50G PON; The service priority of uplink services of EPON or 10G EPON.

9. The method according to claim 2, characterized in that, in, The optical network unit (ONU) of EPON or 10G EPON controls the transmission and cessation of uplink optical signals by receiving downlink optical signals carrying indication information.

10. The method according to claim 9, characterized in that, in, The indication information includes at least one of the following: Physical layer operation, management, and maintenance of PLOAM messages; control frames; special codewords.

11. The method according to claim 2, characterized in that, Also includes: During the first time period, the uplink optical signal of the 50G PON stops being transmitted.

12. The method according to claim 2, characterized in that, Also includes: After the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal is stopped during the second time period, the EPON uplink optical signal or the 10G EPON uplink optical signal is sent again after a preset protection time interval.

13. The method according to claim 1, characterized in that, in, The 50G PON downlink optical reflection signal is a 50G PON downlink reflected optical signal with optical power exceeding a preset threshold.

14. A passive optical network (PON) coexistence device, characterized in that, include: Optical Line Terminal (OLT) and Optical Network Unit (ONU), among which, The OLT includes a time / bandwidth allocation control module, and the ONU includes an EPON ONU and / or a 10G EPON ONU; The time / bandwidth allocation control module is used to generate configuration information that indicates whether the optical signal transmission of the EPON ONU and / or the 10G EPON ONU is turned on or off. Simultaneously, one of the 50G PON downlink signal and the EPON & 10G EPON uplink optical signal is controlled to be transmitted in the PON optical path. The 50G PON downlink signal is the 50G PON downlink optical signal and / or the 50G PON downlink optical reflection signal, and the EPON & 10G EPON uplink optical signal is the EPON uplink optical signal and / or the 10G EPON uplink optical signal.

15. The apparatus according to claim 14, characterized in that, in, The configuration information is used for, The OLT is controlled to send the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal during the first time period, and to stop sending the 50G PON downlink optical signal or the 50G PON downlink optical reflection signal outside the first time period. The ONU is controlled to send the EPON uplink optical signal or the 10G EPON uplink optical signal during the second time period, and to stop sending the EPON uplink optical signal or the 10G EPON uplink optical signal outside the second time period.

16. The apparatus according to claim 15, characterized in that, in, The second time period does not overlap with the first time period.

17. The apparatus according to claim 15, characterized in that, in, The second time period overlaps with or partially overlaps with the first time period.

18. The apparatus according to claim 15, characterized in that, in, The first time period is at least one of the following: A portion of a downlink frame signal period in PON; One or more downlink frame signal periods of the PON.

19. The apparatus according to claim 18, characterized in that, in, The specified time period is at least one of the following: A time period of fixed length; Multiple consecutive time periods of fixed length; A time period with a non-fixed duration; Multiple non-fixed and discontinuous time periods.

20. The apparatus according to claim 14, characterized in that, in, The OLT also includes: a passive optical network media access control (PON) MAC chip and a multimode optical module, wherein the multimode optical module includes 50G PON, EPON and / or 10GEPON; The PON MAC chip is set independently of or includes the time / bandwidth allocation control module; At the same time, one of the 50G PON downlink signal and the EPON & 10G EPON uplink optical signal is transmitted in the optical path of the multimode optical module.

21. The apparatus according to claim 20, characterized in that, in, The PON MAC chip is used 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 used to control the 50G PON transmitter to turn on or off according to the enable control signal.

22. The apparatus according to claim 20, characterized in that, in, The PON MAC chip is also used to convert the configuration information into data information and send the data information to the multimode optical module.

23. The apparatus according to claim 20, characterized in that, in, The multimode optical module also includes a processing chip, a 50G PON laser driver LDD, and a 50G PON optical transmitter assembly TOSA. The processing chip is used 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 turn on or off.

24. The apparatus according to claim 14, characterized in that, in, The configuration information is also used to indicate that the uplink optical signal of the 50G PON stops being transmitted during the first time period.

25. The apparatus according to claim 20, characterized in that, in, The multimode optical module also includes a multimode optical receiver component (ROSA). The multimode ROSA is used to receive uplink optical signals from the EPON, and / or the 10G EPON and the 50G PON, and convert the uplink optical signals into electrical signals.

26. The apparatus according to claim 20, characterized in that, in, The multimode optical module also includes: a multiplexing / demultiplexing module. The multiplexing / demultiplexing module is used to perform multiplexing / demultiplexing processing on multiple downlink optical signals and multiple uplink optical signals, respectively. The multiple downlink optical signals include 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; The multi-path uplink optical signals include the uplink optical signals of the 50G PON, and / or the uplink optical signals of the EPON and the 10GEPON.

27. The apparatus according to claim 26, characterized in that, in, The multiplexing / splitting module is also used for, Multiple downlink optical signals and one uplink optical signal are subjected to multiplexing and demultiplexing processing respectively. The multiple downlink optical signals include 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; The uplink optical signal is the uplink optical signal of the EPON, and / or the 10G EPON, as well as the 50GPON uplink optical signal.

28. The apparatus according to claim 14, characterized in that, in, In the case where the ONU includes a 10G EPON uplink narrowing ONU and / or a 50G PON ONU, the 50GPON downlink optical signal is configured by the OLT to be transmitted continuously.

29. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the method described in any one of claims 1 to 13.

30. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the method described in any one of claims 1 to 13.

Images