Passive optical network system, data transmission method and apparatus

Abstract

The application provides a passive optical network system, a data transmission method and device. The data transmission method comprises the following steps: transmitting different-rate downlink data sent by an OLT or downlink data sent by multiple OLTs on a first specified wavelength in a time division multiplexing (TDM) mode on a downlink of the passive optical network system; and transmitting different-rate uplink data sent by an ONU to the OLT or uplink data sent by the ONU to multiple OLTs on a second specified wavelength in a TDM mode on an uplink of the passive optical network system. The application solves the problem of how to realize coexistence of PON systems on the basis of saving wavelength resources.

Description

[0001] This application is a divisional application of the original application with the application number: 201711060525.4, the application date: November 01, 2017, and the invention name: Passive optical network system, data transmission method and device. TECHNICAL FIELD

[0002] The present application relates to the field of communication, in particular to a passive optical network system, a data transmission method and device. BACKGROUND

[0003] In the IEEE NGEPON standardization process, some operators tend to use 25Gbps as the single wavelength rate from the perspective of EPON / GPON evolution demand, that is, the evolution route is from EPON / GPON to 25Gbps PON, and some operators tend to use 50Gbps as the single wavelength rate from the perspective of 10GEPON / XG-PON evolution demand, that is, the evolution route is from 10GEPON / 10GGPON to 50Gbps PON. When both 25GPON and 50GPON exist demand, if defined as two sets of systems, it is difficult to meet due to the shortage of wavelength resources, and if the same wavelength is used, the completely different rates of uplink and downlink also greatly increase the difficulty.

[0004] In view of the above technical problems in the related art, no effective solution has been proposed so far. SUMMARY

[0005] Embodiments of the present application provide a passive optical network system, a data transmission method and device to at least solve the problem of how to realize PON system coexistence on the basis of saving wavelength resources.

[0006] According to an embodiment of the present application, a passive optical network system is provided, comprising: a downlink and an uplink, wherein different rate downlink data transmitted by an OLT or downlink data transmitted by a plurality of OLTs are transmitted on a first specified wavelength in a time division multiplexing (TDM) manner on the downlink; and different rate uplink data transmitted by an ONU to an OLT or uplink data transmitted by an ONU to a plurality of OLTs are transmitted on a second specified wavelength in a TDM manner on the uplink.

[0007] Optionally, in the case that different rate downlink data transmitted by an OLT are transmitted on a first specified wavelength in a time division multiplexing (TDM) manner on the downlink, and different rate uplink data transmitted by an ONU to an OLT are transmitted on a second specified wavelength in a TDM manner on the uplink, the OLT is configured to transmit the different rate downlink data in different time slots on the first specified wavelength, and receive the different rate uplink data in different time slots on the second specified wavelength.

[0008] Optionally, the OLT is further configured to send first indication information and / or second indication information to the ONU, wherein the first indication information is used to indicate that the ONU receives the downstream data in the first specified time slot, and the second indication information is used to indicate that the ONU transmits the upstream data in the second specified time slot at a rate supported by the ONU.

[0009] Optionally, the ONU is further configured to report the rate supported by the ONU to the OLT, and the OLT is further configured to adjust the transmission mode of the downstream data according to the rate supported by the ONU.

[0010] Optionally, in the case that the ONU supports multiple rates, the ONU is further configured to determine the rate used by the ONU according to the configuration of the OLT.

[0011] Optionally, in the case that the downstream data transmitted by the multiple OLTs is transmitted on the first specified wavelength in a time division multiplexing (TDM) manner on the downstream link, and the upstream data transmitted by the ONU to the multiple OLTs is transmitted on the second specified wavelength in a TDM manner on the upstream link, the transmission rates of the downstream data transmitted by the multiple OLTs are the same or different, and the transmission rates of the upstream data transmitted by the ONU to the multiple OLTs are the same or different.

[0012] Optionally, in the case that the transmission rates of the downstream data transmitted by the multiple OLTs are the same, and the transmission rates of the upstream data transmitted by the ONU to the multiple OLTs are the same, each of the multiple OLTs is connected to a group of ONUs, and service isolation is performed between the multiple groups of ONUs connected by the multiple OLTs.

[0013] According to an embodiment of the present application, a data transmission method is provided, comprising: transmitting downstream data of different rates transmitted by an OLT or downstream data transmitted by multiple OLTs on a first specified wavelength in a time division multiplexing (TDM) manner on a downstream link of a passive optical network system; and transmitting upstream data of different rates transmitted by an ONU to an OLT or upstream data transmitted by the ONU to multiple OLTs on a second specified wavelength in a TDM manner on an upstream link of the passive optical network system.

[0014] Optionally, the transmitting of the downstream data of different rates transmitted by the OLT on the first specified wavelength in the TDM manner on the downstream link of the passive optical network system comprises: transmitting, by the OLT, the downstream data of different rates in different time slots on the first specified wavelength, respectively; and the transmitting of the upstream data of different rates transmitted by the ONU to the OLT on the second specified wavelength in the TDM manner on the upstream link of the passive optical network system comprises: receiving, by the OLT, the upstream data of different rates in different time slots on the second specified wavelength.

[0015] Optionally, after the OLT transmits the downstream data of different rates on the first designated wavelength in different time slots respectively, the method further comprises: the OLT sends first indication information to the ONU, wherein the first indication information is used to instruct the ONU to receive the downstream data in the first designated time slot.

[0016] Optionally, before the OLT receives the upstream data of different rates in different time slots on the second designated wavelength, the method further comprises: the OLT sends second indication information to the ONU, wherein the second indication information is used to instruct the ONU to transmit the upstream data in the second designated time slot according to the rate supported by the ONU.

[0017] Optionally, before the OLT sends the second indication information to the ONU, the method further comprises: the OLT sends configuration information to the ONU, wherein the configuration information is used for the ONU to determine the rate used by the ONU.

[0018] Optionally, the method further comprises: in the case that the rate supported by the ONU changes, the OLT receives the rate currently supported by the ONU reported by the ONU; and the OLT adjusts the transmission mode of the downstream data according to the rate currently supported by the ONU.

[0019] According to an embodiment of the present application, a data transmission device is provided, comprising: a first transmission module, configured to transmit downstream data of different rates transmitted by an OLT or downstream data transmitted by a plurality of OLTs on a first designated wavelength in a time division multiplexing (TDM) manner on a downlink of a passive optical network system; and a second transmission module, configured to transmit upstream data of different rates transmitted by an ONU to the OLT or upstream data transmitted by the ONU to a plurality of OLTs on a second designated wavelength in a TDM manner on an uplink of the passive optical network system.

[0020] According to yet another embodiment of the present application, a storage medium is provided, which comprises a stored program, wherein the program performs any of the above methods when executed.

[0021] According to yet another embodiment of the present application, a processor is provided, which is used to execute a program, wherein the program performs any of the above methods when executed.

[0022] By the present application, since the uplink in the passive optical network system uses the time division multiplexing mode to transmit the different rate downlink data sent by the OLT on the first designated wavelength or the downlink data sent by the multiple OLTs, and to transmit the different rate uplink data sent by the ONU to the OLT on the second designated wavelength or the uplink data sent by the ONU to the multiple OLTs in the TDM mode on the uplink, that is, the time division multiplexing mode is used to transmit different data on the uplink and the downlink, and the same wavelength is used on the downlink and the uplink, and then the coexistence of the PON can be realized on the basis of saving the wavelength resources, thus the problem of how to realize the coexistence of the PON system on the basis of saving the wavelength resources can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0024] Figure 1 is a flowchart of a data transmission method according to an embodiment of the present application;

[0025] Figure 2 is a schematic diagram of multi-rate downlink coexistence according to a preferred embodiment of the present application;

[0026] Figure 3 is a schematic diagram of multi-rate uplink coexistence according to a preferred embodiment of the present application. DETAILED DESCRIPTION

[0027] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0028] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence.

[0029] The embodiment of the present application provides a passive optical network system, which can be a passive optical network system with multiple rates coexisting or a passive optical network system with multiple passive optical network modes coexisting. The passive optical network system provided by the embodiment of the present application comprises a downlink and an uplink, wherein the downlink is used to transmit different-rate downlink data sent by an OLT or downlink data sent by multiple OLTs on a first specified wavelength in a time division multiplexing (TDM) mode; and the uplink is used to transmit different-rate uplink data sent by an ONU to the OLT or uplink data sent by the ONU to multiple OLTs on a second specified wavelength in a TDM mode.

[0030] It should be noted that, when the downlink is used to transmit different-rate downlink data sent by an OLT on a first specified wavelength in a time division multiplexing (TDM) mode, and the uplink is used to transmit different-rate uplink data sent by an ONU to the OLT on a second specified wavelength in a TDM mode, the passive optical network system can support multiple rates coexisting, for example, can support EPON, GPON, 10GEPON, XG-PON, 25GPON, 50GPON coexisting, but is not limited thereto. At this time, the passive optical network system can comprise one or more OLTs, and the different-rate uplink data can be sent by one OLT, but is not limited thereto.

[0031] When the downlink is used to transmit downlink data sent by multiple OLTs on a first specified wavelength in a time division multiplexing (TDM) mode, and the uplink is used to transmit uplink data sent by an ONU to multiple OLTs on a second specified wavelength in a TDM mode, the passive optical network system can support multiple services under the same PON system or the coexistence of multiple OLTs of multiple services.

[0032] It should be noted that, if the multiple OLTs are located in different multiple PON systems respectively, the passive optical network system can also realize the coexistence of multiple PON systems by adopting the mode of transmitting downlink data sent by multiple OLTs or uplink data received by multiple OLTs in a TDM mode.

[0033] Through the passive optical network system, different data are transmitted in a time division multiplexing mode on the uplink and the downlink, and the same wavelength is adopted on the downlink and the same wavelength is adopted on the uplink, so that the coexistence of PONs can be realized on the basis of saving wavelength resources, and thus the problem of how to realize the coexistence of PON systems on the basis of saving wavelength resources can be solved.

[0034] It should be noted that different rates correspond to different PON systems, and in the case that the above-mentioned passive optical network system can support multiple rates coexistence, that is, multiple PON systems corresponding to multiple rates coexist, the OLT in the above-mentioned passive optical network system has uplink bandwidth allocation capability and downlink bandwidth allocation capability, that is, the OLT can inform multiple ONUs connected to the OLT which ONUs receive or send data on which time slots, and in an embodiment of the present application, the above-mentioned OLT in the above-mentioned passive optical network system is further used to send first indication information and / or second indication information to the ONU, wherein the first indication information is used to indicate that the ONU receives downlink data on a first specified time slot, and the second indication information is used to indicate that the ONU sends uplink data on a second specified time slot according to the rate supported by the ONU.

[0035] In an embodiment of the present application, the ONU is further used to report the rate supported by the ONU to the OLT, and the OLT is further used to adjust the sending mode of the downlink data according to the rate supported by the ONU.

[0036] It should be noted that the above-mentioned sending mode can include at least one of the following, but is not limited thereto: modulation format, sending rate, baud rate, working wavelength, and used optical module.

[0037] It should be noted that the above-mentioned modulation format can include at least one of the following, but is not limited thereto: Non-Return to Zero (NRZ) modulation format, 4-level Pulse Amplitude Modulation (PAM4) modulation format, and Duo Binary (DB) modulation format.

[0038] In an embodiment of the present application, in the case that the ONU supports multiple rates, the ONU is further used to determine the rate used by the ONU for work according to the configuration of the OLT. For example, in the case that the ONU supports 25Gbps and 50Gbps, the OLT configures the ONU to use 25Gbps, and then the ONU determines that the rate used by the ONU for work is 25Gbps.

[0039] It should be noted that when a part of the ONUs in the passive optical network system is isolated from the service of another part of the ONUs, a plurality of OLTs can be used to communicate with a plurality of ONUs, one OLT communicates with only a part of the ONUs, and the ONU communicates with only one OLT, at this time, the downlink transmission of the plurality of OLTs is of the same rate or system transmission mode, and the TDM mode needs to be used to transmit the downlink data, and the uplink data is similar, therefore, in an embodiment of the present application, the downlink data transmitted by the plurality of OLTs is transmitted on a first specified wavelength in a time division multiplexing (TDM) mode on the downlink, and the uplink data transmitted by the ONU to the plurality of OLTs is transmitted on a second specified wavelength in a TDM mode on the uplink, the transmission rate of the downlink data transmitted by the plurality of OLTs is the same, and the transmission rate of the uplink data transmitted by the ONU to the plurality of OLTs is the same.

[0040] It should be noted that when the transmission rate of the downlink data transmitted by the plurality of OLTs is the same, and the transmission rate of the uplink data transmitted by the ONU to the plurality of OLTs is the same, each of the plurality of OLTs is connected to a group of ONUs, and the service isolation between the plurality of groups of ONUs connected by the plurality of OLTs.

[0041] It should be noted that the transmission rate of the downlink data transmitted by the plurality of OLTs can also be different, and the transmission rate of the uplink data transmitted by the ONU to the plurality of OLTs can also be different.

[0042] It should be noted that the transmission of the downlink data transmitted by the plurality of OLTs in a time division multiplexing (TDM) mode on a first specified wavelength on the downlink can be that the plurality of OLTs respectively transmit downlink data in different time slots, and the transmitted downlink data is transmitted on the first specified wavelength on the downlink; the transmission of the uplink data transmitted by the ONU to the plurality of OLTs in a TDM mode on a second specified wavelength on the uplink can be that the uplink data is transmitted in different time slots on the uplink, and the plurality of OLTs receives the uplink data in the corresponding time slots.

[0043] It should be noted that each of the plurality of OLTs is connected to a group of ONUs, and the service isolation between the plurality of groups of ONUs connected by the plurality of OLTs.

[0044] It should be noted that the two end nodes of the uplink and the downlink can be the OLT and the ONU in the passive optical network system, but are not limited thereto.

[0045] The embodiment of the present application also provides a data transmission method running in the passive optical network system, Figure 1 is a flowchart of the data transmission method provided by the embodiment of the present application, asFigure 1 The method comprises:

[0046] In step S102, different rates of downlink data sent by the OLT or sent by multiple OLTs are transmitted on a first designated wavelength in a time division multiplexing (TDM) manner on a downlink of the passive optical network system.

[0047] In step S104, different rates of uplink data sent by the ONU to the OLT or sent by the ONU to multiple OLTs are transmitted on a second designated wavelength in a TDM manner on an uplink of the passive optical network system.

[0048] Through the above steps, different data are transmitted in a TDM manner on the uplink and the downlink, and the same wavelength is used on the downlink and the same wavelength is used on the uplink, thereby realizing coexistence of PONs on the basis of saving wavelength resources, and thus the problem of how to realize coexistence of PON systems on the basis of saving wavelength resources can be solved.

[0049] It should be noted that the above step S102 and the above step S104 do not represent the order of execution of the steps, that is, the above step S102 can be executed simultaneously with the above step S104, or the step S102 can be executed first and then the step S104 can be executed, or the step S104 can be executed first and then the step S102 can be executed, but is not limited thereto.

[0050] In an embodiment of the present application, transmitting different rates of downlink data sent by the OLT on a first designated wavelength in a time division multiplexing (TDM) manner on a downlink of the passive optical network system can be manifested as follows: the OLT sends different rates of downlink data in different time slots on the first designated wavelength; and transmitting different rates of uplink data sent by the ONU to the OLT on a second designated wavelength in a TDM manner on an uplink of the passive optical network system can be manifested as follows: the OLT receives different rates of uplink data in different time slots on the second designated wavelength.

[0051] It should be noted that after the OLT sends different rates of downlink data in different time slots on the first designated wavelength, the above method can further comprise: the OLT sends first indication information to the ONU, wherein the first indication information is used to instruct the ONU to receive downlink data in the first designated time slot.

[0052] It should be noted that before the OLT receives different rates of uplink data in different time slots on the second designated wavelength, the above method can further comprise: the OLT sends second indication information to the ONU, wherein the second indication information is used to instruct the ONU to send uplink data in the second designated time slot at a rate supported by the ONU.

[0053] It should be noted that before the OLT sends the second indication information to the ONU, the above method can further include that the OLT sends configuration information to the ONU, wherein the configuration information is used for the ONU to determine a rate used by the ONU.

[0054] It should be noted that the above method can further include that in a case where a rate supported by the ONU changes, the OLT receives a rate currently supported by the ONU reported by the ONU, and adjusts a sending mode of the downlink data according to the rate currently supported by the ONU.

[0055] In an embodiment of the present application, in a case where the downlink data sent by the plurality of OLTs is transmitted on the first specified wavelength in a time division multiplexing (TDM) manner on the downlink, and the uplink data sent by the ONU to the plurality of OLTs is transmitted on the second specified wavelength in a TDM manner on the uplink, the transmission rate of the downlink data sent by the plurality of OLTs is the same, and the transmission rate of the uplink data sent by the ONU to the plurality of OLTs is the same. In the same case, the coexistence of a plurality of services in the same PON system can be realized.

[0056] It should be noted that the transmission rate of the downlink data sent by the plurality of OLTs can also be different, and the transmission rate of the uplink data sent by the ONU to the OLT can also be different. In the case of different transmission rates, that is, the plurality of OLTs are located in different PON systems, and thus the coexistence of a plurality of PON systems is realized.

[0057] Transmitting the downlink data sent by the plurality of OLTs on the first specified wavelength in a time division multiplexing (TDM) manner on the downlink can be manifested as that the plurality of OLTs respectively send the downlink data in different time slots, and the sent downlink data is transmitted on the first specified wavelength of the downlink; and transmitting the uplink data sent by the ONU to the plurality of OLTs on the second specified wavelength in a TDM manner on the uplink can be manifested as that the uplink data is transmitted in different time slots on the uplink, and the plurality of OLTs receive the uplink data in the corresponding time slots.

[0058] Those skilled in the art can clearly understand the method according to the above embodiments can be realized by means of software and necessary general hardware platform, 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 present application can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a plurality of instructions for making a terminal device (which can be a mobile phone, computer, server, or network device, etc.) execute the method described in each embodiment of the present application.

[0059] The embodiment of the present application further provides a data transmission device, which comprises:

[0060] a first transmission module, which is used for transmitting different-rate downlink data sent by an OLT or uplink data sent by a plurality of ONUs in a time division multiplexing (TDM) mode on a first designated wavelength on a downlink of a passive optical network (PON) system;

[0061] a second transmission module, which is used for transmitting different-rate uplink data sent by an ONU to an OLT or uplink data sent by a plurality of ONUs to a plurality of OLTs in a TDM mode on a second designated wavelength on an uplink of the PON system.

[0062] Through the device, different data are transmitted in a TDM mode on the uplink and the downlink, and the same wavelength is used on the downlink and the uplink, so that the coexistence of PONs can be realized on the basis of saving wavelength resources, and thus the problem of how to realize the coexistence of PON systems on the basis of saving wavelength resources can be solved.

[0063] It should be noted that the first transmission module and the second transmission module can be connected or not connected, and are not limited thereto, that is, the first transmission module and the second transmission module can be independent modules or interrelated modules.

[0064] In an embodiment of the present application, the first transmission module can comprise an OLT, an ONU and an uplink between the OLT and the ONU, and the second transmission module can comprise the OLT, the ONU and a downlink between the OLT and the ONU, but is not limited thereto.

[0065] In an embodiment of the present application, the OLT is used for sending different-rate downlink data in different time slots on the first designated wavelength, and the OLT is used for receiving different-rate uplink data in different time slots on the second designated wavelength.

[0066] It should be noted that the OLT is used for sending first indication information to the ONU, wherein the first indication information is used for instructing the ONU to receive downlink data in a first designated time slot.

[0067] It should be noted that the OLT is used for sending second indication information to the ONU, wherein the second indication information is used for instructing the ONU to send uplink data in a second designated time slot according to a rate supported by the ONU.

[0068] It should be noted that the OLT is used for sending configuration information to the ONU, wherein the configuration information is used for the ONU to determine a rate used by the ONU for working.

[0069] It should be noted that in the case that the rate supported by the ONU changes, the OLT is configured to receive the rate currently supported by the ONU reported by the ONU, and adjust the transmission mode of the downstream data according to the rate currently supported by the ONU.

[0070] In an embodiment of the present application, the plurality of OLTs are configured to transmit the downstream data in different time slots respectively, wherein the transmitted downstream data is transmitted on the first designated wavelength of the downstream link, and the upstream data is transmitted in different time slots of the upstream link, and the plurality of OLTs are further configured to receive the upstream data in the corresponding time slots.

[0071] It should be noted that the transmission rates of the downstream data transmitted by the plurality of OLTs are the same or different, and the transmission rates of the upstream data transmitted by the ONU to the plurality of OLTs are the same or different.

[0072] An embodiment of the present application further provides a storage medium, which comprises a stored program, wherein the program performs the method of any one of the above when running.

[0073] Optionally, in the embodiment, the storage medium can comprise 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 storage program codes.

[0074] An embodiment of the present application further provides a processor, which is used for running a program, wherein the program performs the steps in the method of any one of the above when running.

[0075] Optionally, specific examples in the embodiment can refer to the examples described in the above embodiments and optional implementation manners, and the embodiment will not be described here.

[0076] In order to better understand the present application, the present application is further explained in combination with preferred embodiments.

[0077] In order to solve the problem of wavelength resource shortage and realize wavelength sharing by different rates, an embodiment of the present application provides a passive optical network system architecture in which a plurality of PON systems coexist, wherein the upstream data is transmitted in a TDM manner on the upstream wavelength, and the downstream data is transmitted in a TDM manner on the downstream wavelength.

[0078] Generally, the ONUs with same transmission rate or transmission mode are connected with the same OLT, but in some scenarios, for example, when the services of some ONUs are isolated from the services of another group of ONUs, a plurality of OLTs can be used to communicate with some ONUs, one OLT only communicates with a part of the ONUs, and the ONUs only communicate with one OLT, in this case, the downlink transmission of the plurality of OLTs is of same rate or system transmission mode, and TDM mode is also needed to transmit the downlink data.

[0079] It should be noted that the uplink data described above can be uplink data with same transmission rate sent by different OLTs, uplink data with different transmission rates sent by different OLTs, or uplink data with different transmission rates sent by the same OLT. The downlink data described above can be uplink data with same transmission rate received by different OLTs, uplink data with different transmission rates received by different OLTs, or uplink data with different transmission rates received by the same OLT.

[0080] The following describes the uplink data described above as uplink data with different transmission rates sent by the same OLT, and the downlink data described above as downlink data with different transmission rates received by the same OLT, that is, the provided passive optical network system architecture supports multiple rates, different rates support TDM working mode on the same uplink wavelength, and support TDM working mode on the same downlink wavelength, different rate data is sent and received in different time slots, different rates use different sending modes in the corresponding time slots, for example, same baud rate and different modulation formats, different baud rates and same modulation formats, and the like, which are not limited thereto, the sending end (OLT) can adjust the sending mode of the OLT itself according to the rate supported by the target ONU, and the receiving end (ONU) can adjust the receiving mode according to the indication in the frame sent by the sending end, Figure 2 is a schematic diagram of coexistence of multiple rates in downlink according to a preferred embodiment of the present application, Figure 3 is a schematic diagram of coexistence of multiple rates in uplink according to a preferred embodiment of the present application, as shown in Figure 2 and Figure 3 OLT adjusts the receiving mode according to the bandwidth allocation, and ONU decides whether to receive the corresponding time slot according to the indication in the frame.

[0081] In the passive optical network system, the OLT can support the transmission and reception of data at different rates, the ONU can fixedly support one working mode (such as fixedly supporting a rate of 25 Gbps or fixedly supporting a rate of 50 Gbps) or support multiple working modes (such as supporting both a rate of 25 Gbps and a rate of 50 Gbps), and the ONU can work in one of the modes according to the configuration of the OLT when supporting multiple working modes.

[0082] In the passive optical network system, when the working mode of the ONU is adjustable, the OLT discovers that the ONU has the capability of supporting multiple rates and can adjust the working mode of the ONU according to the rate currently supported by the ONU or set the working mode of the ONU.

[0083] The following is described by taking the coexistence of 25 Gbps PON and 50 Gbps PON as an example.

[0084] Preferred embodiment one

[0085] In the NGEPON standardization, the 25G PON and the 50G PON are regarded as the same generation standard, the downstream wavelength adopts 1330 nm, the upstream wavelength adopts 1280 nm, the 25G PON and the 50G PON adopt the same optical module, the same baud rate, and different modulation formats. It should be noted that the modulation format can include at least one of the following: a Non-Return to Zero (NRZ) modulation format, a Pulse Amplitude Modulation (PAM4) modulation format, and a Db modulation format. The 25G PON and the 50G PON adopt different modulation formats in many combinations, such as adopting the NRZ modulation format, the system working at 25 Gbps, i.e., symmetric 25G PON; adopting the PAM4 modulation format, the system working at 50 Gbps, i.e., symmetric 50G PON; but not limited thereto.

[0086] The 25G PON and the 50G PON are the same in the upstream and downstream wavelengths, the optical module, and the baud rate except for the different modulation formats.

[0087] It should be noted that the optical module can be an OLT, an ONU, and the like but is not limited thereto.

[0088] Preferred embodiment two

[0089] The 25G PON and the 50G PON based on the preferred embodiment one can coexist in the same system.

[0090] 1、25G PON and 50G PON downlink work at 1330nm wavelength, using TDM working mode, OLT sends 25Gbps rate data and 50Gbps rate data in different time slots respectively;

[0091] (1) OLT has downlink bandwidth allocation capability, ONU receives data in corresponding time slot according to OLT indication; it should be noted that the downlink bandwidth allocation capability can refer to the following capability of OLT: indicating which ONU in the system receives downlink data in which time slot, but is not limited thereto.

[0092] (2) OLT indicates rate, payload length and other information in corresponding time slot, ONU performs corresponding rate, payload analysis according to the indication.

[0093] 2、25G PON and 50G PON uplink work at 1280nm wavelength, using TDM working mode, OLT allocates uplink bandwidth, the allocated uplink bandwidth is sent to ONU, ONU sends data at a specified rate in the respective uplink bandwidth, OLT has uplink bandwidth allocation capability;

[0094] 3、25G PON and 50G PON use different modulation modes;

[0095] 4、OLT simultaneously supports sending and receiving of 25Gbps and 50Gbps data;

[0096] 5、ONU can support 25Gbps and 50Gbps, but works in one rate mode under OLT configuration, such as only supports 25Gbps or only supports 50Gbps; ONU optional, ONU 25G, ONU 50G.

[0097] 6、25Gbps and 50Gbps rate data are sent and received in different time slots, OLT can adjust its sending rate and receiving rate in time according to the receiving rate and sending rate of ONU, ONU supporting 25Gbps and 50Gbps rate can adjust its sending rate and receiving rate according to the setting of OLT.

[0098] 7、OLT discovers the capabilities supported by ONU, and can adjust its working mode according to the capabilities supported by ONU, or set the working mode of ONU.

[0099] Preferred embodiment three

[0100] In NGEPON standardization, 25G PON and 50G PON are regarded as the same generation standard, the downstream wavelength adopts 1330nm, the upstream wavelength adopts 1280nm, 25G PON and 50G PON adopt the same optical module and different baud rates, when the 25Gbps baud rate is adopted, the system works at 25Gbps, that is, symmetric 25GPON. When the 50Gbps baud rate is adopted, the system works at 50Gbps, that is, symmetric 50GPON.

[0101] 25GPON and 50GPON adopt the same modulation format except that the baud rates are different, and the upstream and downstream wavelengths are the same.

[0102] It should be noted that 25GPON and 50Gbps PON can adopt NRZ modulation format or PAM4 modulation format or Db modulation format, but are not limited thereto, as long as the modulation formats adopted by 25GPON and 50Gbps PON are the same.

[0103] Preferred Embodiment Four

[0104] Based on preferred embodiment three, 25GPON and 50GPON can coexist in the same system.

[0105] 1. 25G PON and 50G PON work at 1330nm wavelength in the downstream, adopt TDM working mode, and OLT sends 25Gbps rate data and 50Gbps rate data in different time slots respectively;

[0106] (1) OLT has downstream bandwidth allocation capability, and ONU receives data in the corresponding time slot according to the indication of OLT; it should be noted that the downstream bandwidth allocation capability can refer to the capability of OLT to indicate which ONU in the system receives downstream data in which time slot, but is not limited thereto.

[0107] 2. 25G PON and 50G PON work at 1280nm wavelength in the upstream, adopt TDM working mode, OLT allocates upstream bandwidth, the allocated upstream bandwidth is sent to ONU, ONU sends data at the specified rate in the respective upstream bandwidth, and OLT has upstream bandwidth allocation capability;

[0108] 3. 25G PON adopts 25Gbps baud rate, and 50Gbps PON adopts 50Gbps baud rate;

[0109] 4. OLT simultaneously supports the transmission and reception of 25Gbps and 50Gbps data;

[0110] 5、ONU can support 25Gbps, 50Gbps optional, but in OLT configuration can only work in one rate mode, such as only support 25Gbps or only support 50Gbps;

[0111] 6、25Gbps, 50Gbps rate data are sent and received at different time slots, OLT can adjust its sending rate and receiving rate in time according to the receiving rate and sending rate of ONU, and 25Gbps, 50Gbps rate ONU can adjust its sending rate and receiving rate according to the setting of ONU.

[0112] 7、OLT discovers the supported capability of ONU, and can adjust its working mode according to the supported capability of ONU, or set the working mode of ONU.

[0113] Preferred embodiment five

[0114] After the deployment of 25GPON system, there is a demand for evolution to 50GPON, for example, the bandwidth demand of users is increased, or the cost of 50GPON is reduced, etc.

[0115] The preferred embodiment is executed on the basis of preferred embodiment two, four, and the 25GPON system gradually evolves to 50GPON system.

[0116] The 25GPON OLT is replaced by a hybrid OLT supporting 25GPON and 50GPON; it should be noted that the 25GPON OLT is replaced by a hybrid OLT supporting 25GPON and 50GPON can be realized by changing the working mode of OLT (such as changing the working mode of OLT from supporting 25GPON to supporting 25GPON and 50GPON at the same time), but is not limited thereto, such as directly replacing the OLT.

[0117] 2、25GPON ONU is upgraded to 50GPON ONU by changing the modulation format, or 25GPON ONU is directly replaced by 50GPON ONU; it should be noted that when the ODN, OLT, ONU design does not meet the power budget requirement, methods such as increasing the transmitting optical power, receiving sensitivity, enhancing FEC, and increasing the amplifier can be used to make the ODN, OLT, ONU meet the power budget requirement.

[0118] 3、In the evolution process of upgrading 25GPON ONU to 50GPON ONU, OLT and passive optical network system work in 25G / 50G hybrid mode;

[0119] 4、When all 25GPON ONUs are upgraded to 50GPON ONUs, OLT and passive optical network system can work in 50G mode.

[0120] Preferred Embodiment Six

[0121] In the 50GPON system deployment, when the ONU is far away from the OLT, or the quality of the fiber line of some ONU branches is poor, some ONUs cannot achieve the best effect if they work in 50GPON, and need to be reduced to 25GPON operation.

[0122] The preferred embodiment is executed on the basis of preferred embodiments two and four, and the 50GPON system is degraded to 25GPON / 50GPON mixed operation mode.

[0123] The 50GPON OLT is converted to 25G / 50G mixed mode;

[0124] The 50GPON ONU with poor link quality is reduced to 25GPON ONU operation mode by replacing the modulation format with the modulation format used by the 25GPON ONU;

[0125] 3. The OLT and the passive optical network system work in 25G / 50G mixed mode.

[0126] Obviously, those skilled in the art should understand that the modules or steps of the present application described above can be realized by general computing devices, which can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be realized by program codes executable by the computing devices, so that they can be stored in storage devices and executed by the computing devices, 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 can be manufactured into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.

[0127] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A downlink data transmission method applied to an optical line terminal (OLT), comprising: The method comprises the following steps: One or more OLTs send different rate downstream data and first indication information to an optical network unit (ONU) on a specified downstream wavelength in a time division multiplexing manner. The different rate downstream data is realized by different sending manners, and the different sending manners comprise one of the following: different baud rates, different modulation formats, different baud rates and different modulation formats. The first indication information is used to indicate that the ONU receives the downstream data on a first specified time slot and a receiving manner of the downstream data. The OLT adjusts the sending manner of the downstream data according to a supported rate of the ONU.

2. The method of claim 1, wherein, The method further comprises the following steps: The OLT changes the rate of sending the downstream data to the ONU by changing the modulation format.

3. The method of claim 1, wherein, The method further comprises the following steps: The OLT acquires the supported rate of the ONU according to a report of the ONU.

4. A method of downstream data transmission, applied to an optical network unit (ONU), the method comprising: The method comprises the following steps: The ONU decides whether to receive the downstream data on the first specified time slot and a receiving manner of the downstream data according to first indication information sent by an optical line terminal (OLT); wherein the receiving manner comprises one of the following: different baud rates, different modulation formats, different baud rates and different modulation formats. The sending manner of the downstream data is adjusted by the OLT according to a supported rate of the ONU.

5. The method of claim 4, wherein, The method further comprises the following steps: The ONU reports the supported rate to the OLT.

6. The method of claim 4, wherein, The method further comprises the following steps: The receiving manner of the downstream data is adjusted according to the first indication information sent by the OLT.

7. An optical line terminal (OLT), comprising: The method comprises the following steps: A sending module is configured to send different rate downstream data and first indication information to an optical network unit (ONU) on a specified downstream wavelength in a time division multiplexing manner. The different rate downstream data is realized by different sending manners, and the different sending manners comprise one of the following: different baud rates, different modulation formats, different baud rates and different modulation formats. The first indication information is used to indicate that the ONU receives the downstream data on a first specified time slot and a receiving manner of the downstream data. A first adjusting module is configured to adjust the sending manner of the downstream data according to a supported rate of the ONU.

8. An optical line termination as claimed in claim 7, characterised in that, The method further comprises the following steps: A changing module is configured to change the rate of sending the downstream data to the ONU by changing the modulation format.

9. An optical line termination as claimed in claim 7, characterized in that, The method further comprises the following steps: An acquiring module is configured to acquire the supported rate of the ONU according to a report of the ONU.

10. An optical network unit (ONU) comprising: The method comprises the following steps: A deciding module is configured to decide whether to receive the downstream data on the first specified time slot and a receiving manner of the downstream data according to first indication information sent by an optical line terminal (OLT); wherein the receiving manner comprises one of the following: different baud rates, different modulation formats, different baud rates and different modulation formats; wherein the sending manner of the downstream data is adjusted by the OLT according to a supported rate of the ONU.

11. The optical network unit of claim 10, wherein, The method further comprises the following steps: A reporting module is configured to report the supported rate to the OLT.

12. The optical network unit of claim 10, wherein, The method further comprises the following steps: A second adjusting module is configured to adjust the receiving manner of the downstream data according to the first indication information sent by the OLT.

13. A passive optical network system, characterized by comprising: The method comprises the following steps: The optical line terminal OLT of any one of claims 1-3 and the optical network unit ONU of any one of claims 4-6.

14. A storage medium, characterized by The storage medium comprises a stored program, wherein the program is executed by the processor to implement the steps of the method of any one of claims 1 to 3, or to implement the steps of the method of any one of claims 4 to 6.

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