WO2019227733A1 - Passive optical network system-based capacity expansion method and system - Google Patents

Abstract

Disclosed in the present invention are a passive optical network system-based capacity expansion method and system, relating to the technical field of capacity expansion of a PON system. The method comprises the following steps: S1. creating a PON system, the PON system including one OLT device, one ODN network, and a plurality of ONU devices that are connected in sequence; S2. expanding the capacity of the OLT device, so that the OLT device is provided with at least one uplink channel and at least two downlink channels; and S3. providing at least one uplink channel and at least one downlink channel in each ONU device, the uplink channels in each ONU device respectively matching any uplink channels in the OLT device, and the downlink channels in each ONU device respectively matching any downlink channels in the OLT device. The PON system of the present invention adds a downlink channel at the OLT end, thereby accomplishing system capacity expansion, providing more choices and higher bandwidth for the PON system, and satisfying the usage demand of increasing users.

Description

Capacity expansion method and system based on passive optical network system Technical field

The present invention relates to the technical field of capacity expansion of a PON system, and in particular, to a method and system for capacity expansion based on a passive optical network system.

Background technique

When the existing passive optical network system is undergoing system expansion, a system expansion and upgrade method that directly increases the rate on the structure is often adopted. This method is a hard upgrade method. It has proposed extremely high bandwidth for optical devices and network management technologies. High requirements

This upgrade method requires updating and re-development of all components of the passive optical network system. The labor and capital costs for the system provider are high, and the system expansion and upgrade costs and maintenance costs are increased for operation.

Therefore, a capacity expansion and upgrade method is needed to meet service bandwidth requirements, and at the same time, it provides a relatively low-cost solution for operators to implement capacity expansion and upgrade.

Summary of the Invention

Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a method and system for expanding capacity based on a passive optical network system, which adds a downlink channel to the OLT side of the PON system. Increased user demand.

In order to achieve the above objectives, the technical solutions adopted by the present invention are:

A capacity expansion method based on a passive optical network system. The method is suitable for a PON system in a time division multiplexing mode. The method includes the following steps:

S1. Create a PON system, which includes one OLT device, one ODN network, and multiple ONU devices connected in sequence;

S2. Expand the OLT equipment so that the OLT equipment is provided with at least one uplink channel and at least two downlink channels;

S3. Each ONU device is provided with at least one uplink channel and at least one downlink channel. The uplink channel in each ONU device matches any uplink channel in the OLT device. The downlink channel in each ONU device is connected to the OLT device. Any downstream channel within the match.

Based on the above technical solution, the method further includes the following steps:

Expand the capacity of the OLT equipment so that it contains at least 2 uplink channels, and each uplink channel of the ONU equipment is matched with any uplink channel of the OLT equipment.

Based on the above technical solution, the method further includes the following steps:

Expand the capacity of the ONU equipment. There are at least 2 uplink channels in the ONU equipment, and each uplink channel of the ONU equipment is matched with any uplink channel in the OLT equipment.

Based on the above technical solution, the method further includes the following steps:

Expand the capacity of the ONU equipment. There are at least two downlink channels in the ONU equipment. Each downstream channel of the ONU equipment is matched with any downstream channel in the OLT equipment.

Based on the above technical solution, the method further includes the following steps:

Expand the capacity of the OLT equipment. There are at least 2 uplink channels in the OLT equipment.

Expand the capacity of the ONU equipment. There are at least 2 uplink channels and at least 2 downlink channels in the ONU equipment.

Based on the above technical solution, after the OLT device is expanded, a PLOAM message is added, and the PLOAM message is sent to each ONU device. The ONU device adjusts the uplink transmission mode and obtains the downlink channel information according to the PLOAM message.

The invention discloses a capacity expansion system based on a passive optical network system. The system is suitable for a PON system in a time division multiplexing mode. The system includes:

1 OLT device, 1 ODN network, and multiple ONU devices connected in sequence;

The OLT device is provided with at least one uplink channel and at least two downlink channels;

Each ONU device is provided with at least one uplink channel and at least one downlink channel; the uplink channel in each ONU device matches any uplink channel in the OLT device, and the downlink channel in each ONU device is respectively Match with any downlink channel in the OLT device.

On the basis of the above technical solution, the OLT device includes at least two uplink channels, and each uplink channel of the ONU device is matched with any uplink channel of the OLT device, respectively.

Based on the above technical solution, the ONU device includes at least two uplink channels, and each uplink channel of the ONU device is matched with any uplink channel of the OLT device.

On the basis of the above technical solution, the ONU device includes at least two downlink channels, and each downlink channel of the ONU device is matched with any downlink channel of the OLT device.

On the basis of the above technical solution, the OLT device includes at least 2 uplink channels;

The ONU device includes at least two uplink channels and at least two downlink channels.

Based on the above technical solution, the OLT device adds a PLOAM message and sends the PLOAM message to each ONU device. The ONU device adjusts the uplink transmission mode and obtains the downlink channel information according to the PLOAM message.

Compared with the prior art, the advantages of the present invention are:

(1) The present invention adds a downstream channel to the PON system at the OLT side to complete the system expansion. Under the premise of ensuring low cost, it provides more options and higher bandwidth for the PON system to meet the increasing demand for users.

(2) The present invention achieves the purpose of increasing the uplink bandwidth capacity by a geometric multiple by adding at least two uplink wavelength channels at the OLT equipment side.

(3) The present invention achieves the objective of increasing the uplink bandwidth capacity by a geometric multiple by setting at least two uplink wavelength channels on the ONU equipment side.

(4) The present invention further increases the downlink bandwidth capacity by a geometric multiple by adding at least two downlink wavelength channels at the ONU device side.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a step diagram of a capacity expansion method based on a passive optical network system in Embodiment 1 of the present invention; FIG.

2 is a step diagram of a capacity expansion method based on a passive optical network system in Embodiment 2 of the present invention;

3 is a step diagram of a capacity expansion method based on a passive optical network system in Embodiment 3 of the present invention;

4 is a step diagram of a capacity expansion method based on a passive optical network system in Embodiment 4 of the present invention;

5 is a step diagram of a capacity expansion method based on a passive optical network system in Embodiment 5 of the present invention;

6 is a schematic structural diagram of a capacity expansion system based on a passive optical network system in Embodiment 7 of the present invention;

7 is a schematic structural diagram of a capacity expansion system based on a passive optical network system in Embodiment 8 of the present invention;

8 is a schematic structural diagram of a capacity expansion system based on a passive optical network system in Embodiment 9 of the present invention;

9 is a schematic structural diagram of a capacity expansion system based on a passive optical network system in Embodiment 10 of the present invention;

10 is a schematic structural diagram of a capacity expansion system based on a passive optical network system in Embodiment 11 of the present invention;

Detailed ways

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Example 1

For convenience of description, the upstream channel according to the present invention stipulates that the data flow is from the ONU device to the OLT device, and the downstream channel according to the present invention refers to the data channel from the OLT device to the ONU device.

As shown in FIG. 1, Embodiment 1 of the present invention provides a capacity expansion method based on a passive optical network system. The method is applicable to a PON system in a time division multiplexing mode. The method includes the following steps:

S1. Create a PON system. The PON system includes one OLT device, one ODN network, and multiple ONU devices connected in sequence;

S2. Expand the capacity of the OLT equipment, so that the OLT equipment is provided with at least one uplink channel and at least two downlink channels;

S3. Each ONU device is provided with at least one uplink channel and at least one downlink channel. The uplink channel in each ONU device matches any uplink channel in the OLT device. The downlink channel in each ONU device is connected to the OLT device. Any downstream channel within the match.

In the existing TDM-PON system, which is a passive optical network system in the time division multiplexing mode, it includes one OLT device, one ODN network, and multiple ONU devices. The downlink shares the downlink channel with a wavelength of λ _d1 by broadcast, and the uplink passes The time division method shares the uplink channel with a wavelength of λ _u1 .

In the present invention, the downlink channel of the OLT device is expanded so that the passive optical network system, that is, the PON system includes at least two downlink channels. The PON system includes one OLT device, one ODN network, and multiple ONU devices connected in sequence. The broadcast mode shares the bandwidth of the downlink wavelength channel that it supports. The uplink shares the uplink channel with an uplink wavelength of λ _u1 by time division. The downlink channel adds m downlink channels. That is, after adding an original downlink channel, the PON system includes m. +1 downlink channels, and the wavelengths of the downlink channels are λ _d1 … to λ _{dm + 1 respectively} , where λ _d1 is the wavelength used by the original downlink channel;

At this time, the ONU device includes an upstream channel and a downstream channel. The downstream channel in each ONU device matches one of the downstream channels in the OLT device. That is, the wavelength used by the downstream channel of each ONU is at the OLT downstream channel wavelength λ _d1. … To λ _{dm + 1} , one of the downstream channels in one ONU device corresponds to one of the downstream channels of the OLT device.

In the present invention, the PON system adds a downlink channel at the OLT side, thereby completing system expansion, providing more options and higher bandwidth for the PON system, and meeting the increasing demand for users.

It should be noted that after the PON system is expanded, all ONU devices are uniformly managed, and there is a unique number in the system, and the number of the ONU device before the expansion is maintained in the system and remains unique.

In terms of office and remote device management, the asymmetric system in the expanded PON system has multiple downlink channels and one uplink channel. The central office equipment OLT needs to know the remote equipment ONU equipment form and access channel.

At the central office OLT side, the OLT equipment adds a management control message. In EPON or 10G EPON systems, the line message type is added in MPCP (multipoint control protocol), and in GPON or XG (s) PON systems, it is added. A downlink PLOAM (physical layer OAM) message type, broadcasting the channel number and wavelength frequency of this channel on all channels,

On the remote ONU side, the ONU receives the channel number and wavelength frequency management control message broadcasted by the OLT, and collates the receiving drive circuit of the ONU optical module to make it receive the central wavelength and The wavelengths are consistent. And record the correspondence between the channel number and wavelength frequency. During the discovery and registration process, the ONU reports the number of downlink channels and channel numbers of the downlink channels it has received.

On the OLT side of the central office, the OLT records the channel information reported by the ONU, and establishes a mapping relationship between the ONU number and the number of downstream channels and channel numbers of the downstream channels. The OLT selects a channel to send a ranging management control message for ranging. In the subsequent data transmission bandwidth authorization process, the OLT may select a relatively idle channel among the downlink channels supported by the ONU to send a management control message to the ONU.

In addition, the OLT device includes a MAC and logic controller, an optical module, and a multiplexer / demultiplexer, and the optical module includes a receiving end for processing an uplink channel and a sending end for a downlink channel. It can be understood that the number of receiving ends and The number of uplink channels matches, and the number of senders matches the number of downlink channels;

The ONU device includes a MAC and a logic controller, a receiving end, and a transmitting end. The receiving end of the ONU device is used to process the downstream channels. The number of the ONU device matches the number of the downstream channels. The number matches the number of upstream channels.

It should be noted that the Passive Optical Network (PON) technology is a broadband optical access technology based on optical fiber. The PON system consists of an Optical Line Terminal (OLT) and an Optical Distribution Network (ODN). ) And Optical Network Unit (ONU);

Currently, the EPON system of the IEEE standard system and the GPON system of the ITU standard system are currently commonly used. Currently, passive optical network systems can provide 1 Gb / s or 2.5 Gb / s bandwidth capabilities. With the increasing demand for bandwidth from users, Began to upgrade and deploy a single-channel 10Gb / s system, which can provide users with a bandwidth capacity of 10Gb / s peak;

However, as the application of 5G and new services has a higher demand for bandwidth, the optical access network system needs to evolve to a higher rate (such as 25Gb / s or 50Gb / s). The most important principle for the evolution of PON networks is Shared ODN, including original investment;

However, due to the limited uplink wavelength resources of PON, 1Gb / sPON systems and 10Gb / sPON systems occupy low-cost uplink wavelength windows (1270nm +/- 10nm and 1310nm +/- 10nm), making the next-generation super 10G rate system wavelength resources very tight. It also makes it difficult for the next-generation post-10Gb / s technology to coexist with the existing PON technology in the same ODN.

In addition, it should be noted that the PON system in the present invention may specifically be a TDM-PON system, and TDM is a time division multiplexing mode.

Example 2

Referring to FIG. 2, Embodiment 2 of the present invention provides a capacity expansion method based on a passive optical network system. Based on Embodiment 1, the method further includes the following steps after step S3:

It also includes the following operation steps: S4. Expand the capacity of the OLT device to include at least 2 uplink channels, and each uplink channel of the ONU device matches any uplink channel of the OLT device.

In this embodiment, S2 is to expand the downlink channel of the OLT equipment of the PON system, S3 is to match the ONU equipment with the expanded OLT equipment, and the subsequent step is to expand the uplink channel of the OLT equipment, so that Expansion of the upstream channel of the PON system can also expand the upstream capacity of the system;

On the basis of meeting the downstream capacity expansion of the passive optical network system, according to user requirements and operational deployment, by adding at least two uplink wavelength channels on the OLT equipment side, the purpose of increasing the uplink bandwidth capacity to a geometric multiple is achieved;

The formed at least two upstream wavelength channels use different wavelengths from the existing system's upstream channels. The additional channels are added to the original ODN network by adding a multiplexer / demultiplexer to the OLT equipment.

It should be noted that the present invention first expands the downlink channel of the OLT device, so that the passive optical network system, that is, the PON system includes at least two downlink channels, and the PON system includes one OLT device, one ODN network, and multiple ONUs connected in sequence. Equipment, the downlink channel adds m downlink channels, that is, after adding an original downlink channel, the PON system includes m + 1 downlink channels, and the wavelengths of the downlink channels are λ _d1 … to λ _{dm + 1} , where λ _d1 is the wavelength used by the original downlink channel;

The uplink channel of the OLT equipment is expanded, so that the passive optical network system, that is, the PON system, includes at least two uplink channels, and the uplink channel adds n uplink channels. That is, after adding an original uplink channel, the PON system includes n + 1 uplink channel, and the wavelength of the uplink channel is λ _u1 … to λ _{un + 1} , where λ _u1 is the wavelength used by the original uplink channel;

At this time, the ONU device includes an upstream channel and a downstream channel. The downstream channel in each ONU device matches one of the downstream channels in the OLT device. That is, the wavelength used by the downstream channel of each ONU is at the OLT downstream channel wavelength λ _d1. … To λ _{dm + 1} , one of the downstream channels in one ONU device corresponds to one of the downstream channels of the OLT device;

The upstream channel in each ONU device matches one of the upstream channels in the OLT device, that is, the wavelength used by the upstream channel of each ONU is selected from the OLT upstream channel wavelength λ _u1 … to λ _{un + 1} , and one of the ONU devices The uplink channel corresponds to one of the uplink channels of the OLT device.

In the present invention, the PON system adds a downlink channel and an uplink channel at the same time on the OLT side, thereby completing system expansion, providing more options and higher bandwidth for the PON system, and meeting the increasing demand for users.

Example 3

As shown in FIG. 3, an embodiment of the present invention provides a method for expanding a capacity based on a passive optical network system. Based on Embodiment 1, the method further includes the following steps after step S3:

S4. Expand the capacity of the OLT device so that it includes at least two uplink channels, and each uplink channel of the ONU device matches any uplink channel of the OLT device.

S5. Expand the capacity of the ONU equipment. There are at least two uplink channels in the ONU equipment, and each uplink channel of the ONU equipment is matched with any uplink channel in the OLT equipment.

In this embodiment, S2 is to expand the downlink channel of the OLT equipment of the PON system, S3 is to match the ONU equipment with the expanded OLT equipment, and the subsequent step is to perform the uplink channel of the ONU equipment of the PON system. Expansion to expand the upstream capacity of the system to meet different usage needs;

On the basis of meeting the downstream capacity expansion of the passive optical network system, according to user needs and operational deployment, at least two uplink wavelength channels are set on the ONU device side to achieve the purpose of increasing the uplink bandwidth capacity to a geometric multiple;

At least two upstream wavelength channels use different wavelengths from the existing system's upstream channels. The new channels are added to the original ODN network by adding multiplexers and demultiplexers to the OLT equipment.

It should be noted that the present invention first expands the downlink channel of the OLT device, so that the passive optical network system, that is, the PON system includes multiple downlink channels, and the PON system includes one OLT device, one ODN network, and multiple ONU devices connected in sequence. , The downlink channel adds m downlink channels, that is, after adding an original downlink channel, the PON system includes m + 1 downlink channels, and the wavelengths of the downlink channels are λ _d1 … to λ _{dm + 1} , of which λ _d1 The wavelength used by the original downlink channel;

The upstream channel of the OLT equipment is expanded, and the upstream channel is added with n uplink channels. That is, after adding an original uplink channel, the PON system includes n + 1 uplink channels, and the wavelengths of the upstream channels are λ _u1. … To λ _{un + 1} , where λ _u1 is the wavelength used by the original uplink channel;

At this time, the ONU device includes at least two uplink channels and one downlink channel. The downlink channel in each ONU device matches one of the downlink channels in the OLT device, that is, the wavelength used by the downlink channel of each ONU is the wavelength of the OLT downlink channel. λ _d1 … to λ _{dm + 1} , one of the downstream channels in one ONU device corresponds to one of the downstream channels of the OLT device;

Each upstream channel in each ONU device matches one of the upstream channels in the OLT device, that is, the wavelength used by the upstream channel of each ONU is selected from the OLT upstream channel wavelength λ _u1 … to λ _{un + 1} , and one of the ONUs Each uplink channel in the device corresponds to one of the uplink channels of the OLT device.

It should be noted that, in this embodiment, the ONU device includes at least two uplink channels. Therefore, a multiplexer is configured to the ONU device as needed, and the type of the multiplexer is selected according to the actual use situation.

Example 4

As shown in FIG. 4, an embodiment of the present invention further provides a method for expanding capacity based on a passive optical network system. Based on Embodiment 1, the method further includes the following steps after step S3:

S4. Expand the capacity of the ONU equipment. There are at least two downstream channels in the ONU equipment, and each downstream channel of the ONU equipment is matched with any downstream channel in the OLT equipment.

In this embodiment, S2 is to expand the downstream channel of the OLT device of the PON system, S3 is to match the ONU device with the expanded OLT device, and the subsequent step is to perform the downstream channel of the ONU device of the PON system. Expansion can also expand the downlink capacity of the system;

On the basis of meeting the downstream capacity expansion of the OLT equipment side of the passive optical network system, according to user requirements and operational deployment, at least two downstream wavelength channels are added through the ONU equipment side to further achieve the purpose of increasing the downstream bandwidth capacity to a geometric multiple;

The formed at least two downlink wavelength channels use different wavelengths from the downlink channels of the existing system, and the new channels are integrated into the original ODN equipment by adding a multiplexer / demultiplexer to the OLT equipment.

It should be noted that the present invention first expands the downlink channel of the OLT device, so that the passive optical network system, that is, the PON system includes multiple downlink channels, and the PON system includes one OLT device, one ODN network, and multiple ONU devices connected in sequence. The downlink shares the bandwidth of the downlink wavelength channel it supports by broadcasting. The downlink channel adds m downlink channels, that is, after adding an original downlink channel, the PON system includes m + 1 downlink channels, and the wavelength of the downlink channel. Λ _d1 … to λ _{dm + 1 respectively} , where λ _d1 is the wavelength used by the original downlink channel, and the uplink shares the uplink channel with wavelength λ _u1 by time division;

At this time, the ONU device includes an upstream channel and at least two downstream channels. The downstream channel in each ONU device matches one of the downstream channels in the OLT device, that is, the wavelength used by the downstream channel of each ONU is in the OLT downstream channel. The wavelengths λ _d1 … to λ _{dm + 1} are selected, and different downstream channels in one ONU device correspond to one of the downstream channels of the OLT device.

It should be noted that, in this embodiment, the ONU device includes at least two downlink channels. If the ONU device is provided with only one receiving end or transmitting end, a demultiplexer must be configured to the ONU device. If the ONU device is provided with multiple At the receiving end, there is no need to configure a demultiplexer to the ONU equipment, and the type of the demultiplexer is selected according to the actual use situation.

Example 5

As shown in FIG. 5, an embodiment of the present invention further provides a method for expanding a capacity based on a passive optical network system. On the basis of Embodiment 1, the method further includes the following steps after step S3:

S4. Expand the capacity of the OLT equipment. There are at least two uplink channels in the OLT equipment.

S5. Expand the capacity of the ONU equipment. There are at least 2 uplink channels and at least 2 downlink channels in the ONU equipment.

It should be noted that the uplink channel in each ONU device matches any uplink channel in the OLT device, and the downlink channel in each ONU device matches any downlink channel in the OLT device.

In this embodiment, S2 is to expand the downlink channel of the OLT equipment of the PON system, S3 is to match the ONU equipment with the expanded OLT equipment, and the subsequent step S4 is to expand the uplink channel of the OLT equipment. Step S5 is to simultaneously expand the uplink and downlink channels of the ONU equipment, thereby expanding the uplink channel and downlink channel of the PON system, and also expanding the system's uplink capacity and downlink capacity;

The formed at least two upstream wavelength channels and at least two downstream wavelength channels use different wavelengths from the existing system's upstream channels. The new channels are integrated into the original ODN network by adding multiplexers and demultiplexers to the OLT equipment.

It should be noted that the present invention first expands the downlink channel of the OLT device, so that the passive optical network system, that is, the PON system includes multiple downlink channels, and the PON system includes one OLT device, one ODN network, and multiple ONU devices connected in sequence. , The downlink channel adds m downlink channels, that is, after adding an original downlink channel, the PON system includes m + 1 downlink channels, and the wavelengths of the downlink channels are λ _d1 … to λ _{dm + 1} , where λ _d1 The wavelength used by the original downlink channel;

The upstream channel of the OLT equipment is expanded, and the upstream channel is added with n uplink channels. That is, after adding an original uplink channel, the PON system includes n + 1 uplink channels, and the wavelengths of the upstream channels are λ _u1. … To λ _{un + 1} , where λ _u1 is the wavelength used by the original uplink channel;

At this time, the ONU device includes at least two uplink channels and at least two downlink channels. The downlink channels in each ONU device match one of the downlink channels in the OLT device, that is, the wavelength used by the downlink channels of each ONU is at the OLT. The downlink channel wavelengths λ _d1 … to λ _{dm + 1} are selected, and different downlink channels in one ONU device respectively correspond to one of the downlink channels of the OLT device;

Each upstream channel in each ONU device matches one of the upstream channels in the OLT device, that is, the wavelength used by the upstream channel of each ONU is selected from the OLT upstream channel wavelength λ _u1 … to λ _{un + 1} , and one of the ONUs Each uplink channel in the device corresponds to one of the uplink channels of the OLT device.

It should be noted that, in this embodiment, the ONU device includes at least two uplink channels. Therefore, the ONU device is configured with a multiplexer as required, and the model of the multiplexer is selected according to the actual use situation;

In addition, in this embodiment, the ONU device includes at least two downlink channels. Therefore, if the ONU device is provided with only one receiving end or transmitting end, a demultiplexer must be configured to the ONU device. If the ONU device is provided with multiple receiving channels, End, there is no need to configure a demultiplexer to the ONU equipment, and the type of the demultiplexer is selected according to the actual use situation.

Example 6

The embodiment of the present invention provides a capacity expansion method based on a passive optical network system. Based on Embodiment 1,

Each downstream channel of the OLT device is connected to an optical fiber through a multiplexer / demultiplexer and connected to the ODN network.

In this embodiment, after the OLT device is expanded, a PLOAM message is added and the PLOAM message is sent to each ONU device. The ONU device adjusts the uplink transmission mode and obtains the downlink channel information according to the PLOAM message.

In this embodiment, after the expansion, on the OLT equipment side, an optical module transmission driving circuit with an extended wavelength is added to the physical layer, and waves of multiple downlink channels are combined into a multiplexer / demultiplexer for optical fiber transmission. The rate can be the same or different, and a higher rate downlink rate mode can be adopted. The wavelength channel rate of the downlink channel can be configured according to the network structure or system capacity requirements, and the expanded ODN network retains the existing deployment.

It should be noted that PLOAM stands for Physical Layer Operation, Administration and Maintenance, and the Chinese meaning is physical layer operation management and maintenance.

In this embodiment, on the OLT side, the expanded OLT equipment allows ONU equipment in the PON system to sense the structure of the PON system. The expanded OLT equipment needs to add a new PLOAM (physical layer OAM) message, which is a Wavelength Channel PLOAM message;

Assume that the OLT device has two downlink channels, the wavelength λ channel and the wavelength λ1 channel broadcast Wavelength Channel PLOAM (physical layer OAM) messages to inform all ONU equipment systems of the downstream wavelength channel information.

In the downstream wavelength λ channel, Wavelength Channel PLOAM informs that the downstream channel number is 0 and the center wavelength is λ;

In the downlink wavelength λ ₁ channel, Wavelength Channel PLOAM informs the downlink channel number 1 and the center wavelength λ ₁ ;

The ONU device adjusts the uplink transmission mode through the received Profile PLOAM (physical layer OAM) message. The ONU device obtains the downstream channel information of the ONU access through the received Wavelength Channel PLOAM (physical layer OAM) message; such as the physical sequence. The Wavelength Channel PLOAM received by the ONU device number SN1 is the downstream channel number 0 and the center wavelength is λ. This ONU device corrects the reception center frequency of the ONU optical module to reduce signal loss;

The ONU device records that the number of downstream channels supported by the ONU is 1, and the number of the downstream channel accessed is 0, which is reported to the OLT.

For ONU devices that support dual downstream channels, such as ONU devices with physical serial number SN2, they can receive two Wavelength Channel PLOAM messages from the downstream wavelength λ channel and the downstream wavelength λ ₁ channel. Similarly, the ONU device corrects the reception of the ONU optical module. Center frequency. It is also recorded that the number of downstream channels supported by the ONU is 2, and the channel numbers are 0 and 1.

Example 7

For convenience of description, the upstream channel according to the present invention stipulates that the data flow is from the ONU device to the OLT device, and the downstream channel according to the present invention refers to the data channel from the OLT device to the ONU device.

As shown in FIG. 6, an embodiment of the present invention provides a capacity expansion system based on a passive optical network system. The system is suitable for a PON system in a time division multiplexing mode. The system includes an OLT device and an ODN network connected in this order. And multiple ONU equipment;

The OLT equipment is provided with at least one uplink channel and at least two downlink channels;

Each ONU device is provided with at least one uplink channel and at least one downlink channel; the uplink channel in each ONU device matches any uplink channel in the OLT device, and the downlink channel in each ONU device matches any arbitrary channel in the OLT device. Downstream channels match.

In the existing TDM-PON system, which is a passive optical network system in the time division multiplexing mode, it includes one OLT device, one ODN network, and multiple ONU devices. The downlink shares the downlink channel with a wavelength of λ _d1 by broadcast, and the uplink passes The time division method shares the uplink channel with a wavelength of λ _u1 .

In the present invention, the downlink channel of the OLT device is expanded so that the passive optical network system, that is, the PON system includes at least two downlink channels. The PON system includes one OLT device, one ODN network, and multiple ONU devices connected in sequence. The broadcast mode shares the bandwidth of the downlink wavelength channel that it supports. The uplink shares the uplink channel with an uplink wavelength of λ _u1 by time division. The downlink channel adds m downlink channels. That is, after adding an original downlink channel, the PON system includes m. +1 downlink channels, and the wavelengths of the downlink channels are λ _d1 … to λ _{dm + 1 respectively} , where λ _d1 is the wavelength used by the original downlink channel;

At this time, the ONU device includes an upstream channel and a downstream channel. The downstream channel in each ONU device matches one of the downstream channels in the OLT device. That is, the wavelength used by the downstream channel of each ONU is at the OLT downstream channel wavelength λ _d1. … To λ _{dm + 1} , one of the downstream channels in one ONU device corresponds to one of the downstream channels of the OLT device.

In the present invention, the PON system adds a downlink channel at the OLT side, thereby completing system expansion, providing more options and higher bandwidth for the PON system, and meeting the increasing demand for users.

It should be noted that after the PON system is expanded, all ONU devices are uniformly managed, and there is a unique number in the system, and the number of the ONU device before the expansion is maintained in the system and remains unique.

In terms of office and remote device management, the asymmetric system in the expanded PON system has multiple downlink channels and one uplink channel. The central office equipment OLT needs to know the remote equipment ONU equipment form and access channel.

At the central office OLT side, the OLT equipment adds a management control message. In EPON or 10G EPON systems, the line message type is added in MPCP (multipoint control protocol), and in GPON or XG (s) PON systems, it is added. A downlink PLOAM (physical layer OAM) message type, broadcasting the channel number and wavelength frequency of this channel on all channels,

On the remote ONU side, the ONU receives the channel number and wavelength frequency management control message broadcasted by the OLT, and collates the receiving drive circuit of the ONU optical module to make it receive the center wavelength and the channel number and wavelength frequency management control message broadcasted by the OLT. The wavelengths are consistent. And record the correspondence between the channel number and wavelength frequency. During the discovery and registration process, the ONU reports the number of downlink channels and channel numbers of the downlink channels it has received.

On the OLT side of the central office, the OLT records the channel information reported by the ONU, and establishes a mapping relationship between the ONU number and the number of downstream channels and channel numbers of the downstream channels. The OLT selects a channel to send a ranging management control message for ranging. In the subsequent data transmission bandwidth authorization process, the OLT may select a relatively idle channel among the downlink channels supported by the ONU to send a management control message to the ONU.

In addition, the OLT device includes a MAC and logic controller, an optical module, and a multiplexer / demultiplexer, and the optical module includes a receiving end for processing an uplink channel and a sending end for a downlink channel. It can be understood that the number of receiving ends and the The number of uplink channels matches, and the number of senders matches the number of downlink channels;

The ONU device includes a MAC and a logic controller, a receiving end, and a transmitting end. The receiving end of the ONU device is used to process the downstream channels. The number of the ONU device matches the number of the downstream channels. The number matches the number of upstream channels.

It should be noted that the Passive Optical Network (PON) technology is a broadband optical access technology based on optical fiber. The PON system consists of an Optical Line Terminal (OLT) and an Optical Distribution Network (ODN). ) And Optical Network Unit (ONU);

Currently, the EPON system of the IEEE standard system and the GPON system of the ITU standard system are currently commonly used. Currently, passive optical network systems can provide 1 Gb / s or 2.5 Gb / s bandwidth capabilities. With the increasing demand for bandwidth from users, Began to upgrade and deploy a single-channel 10Gb / s system, which can provide users with a bandwidth capacity of 10Gb / s peak;

However, as the application of 5G and new services has a higher demand for bandwidth, the optical access network system needs to evolve to a higher rate (such as 25Gb / s or 50Gb / s). The most important principle for the evolution of PON networks is Shared ODN, including original investment;

However, due to the limited uplink wavelength resources of PON, 1Gb / sPON systems and 10Gb / sPON systems occupy low-cost uplink wavelength windows (1270nm +/- 10nm and 1310nm +/- 10nm), making the next-generation super 10G rate system wavelength resources very tight. It also makes it difficult for the next-generation post-10Gb / s technology to coexist with the existing PON technology in the same ODN.

In addition, it should be noted that the PON system in the present invention may specifically be a TDM-PON system, and TDM is a time division multiplexing mode.

Among them, in FIG. 6, m = 1 is used as an example to show a system structural block diagram of this embodiment.

Example 8

Referring to FIG. 7, an embodiment of the present invention provides a capacity expansion system based on a passive optical network system. Based on Embodiment 7,

The OLT device includes at least two uplink channels, and each uplink channel of the ONU device matches any uplink channel of the OLT device.

This embodiment first expands the downlink channel of the OLT equipment of the PON system, then matches the ONU equipment with the expanded OLT equipment, and then expands the uplink channel of the OLT equipment, thereby performing the uplink channel of the PON system. Expansion can also expand the uplink capacity of the system;

On the basis of meeting the downstream capacity expansion of the passive optical network system, according to user requirements and operational deployment, by adding at least two uplink wavelength channels on the OLT equipment side, the purpose of increasing the uplink bandwidth capacity to a geometric multiple is achieved;

The formed at least two upstream wavelength channels use different wavelengths from the existing system's upstream channels. The additional channels are added to the original ODN network by adding a multiplexer / demultiplexer to the OLT equipment.

It should be noted that the present invention first expands the downlink channel of the OLT device, so that the passive optical network system, that is, the PON system includes at least two downlink channels, and the PON system includes one OLT device, one ODN network, and multiple ONUs connected in sequence. Equipment, the downlink shares the bandwidth of the downlink wavelength channel that it supports by broadcasting. The downlink channel adds m downlink channels, that is, after adding an original downlink channel, the PON system includes m + 1 downlink channels, and the downlink channel's The wavelengths are λ _d1 … to λ _{dm + 1} , where λ _d1 is the wavelength used by the original downlink channel;

The uplink channel of the OLT equipment is expanded, so that the passive optical network system, that is, the PON system, includes at least two uplink channels, and the uplink channel adds n uplink channels. That is, after adding an original uplink channel, the PON system includes n + 1 uplink channel, and the wavelength of the uplink channel is λ _u1 … to λ _{un + 1} , where λ _u1 is the wavelength used by the original uplink channel;

At this time, the ONU device includes an upstream channel and a downstream channel. The downstream channel in each ONU device matches one of the downstream channels in the OLT device. That is, the wavelength used by the downstream channel of each ONU is at the OLT downstream channel wavelength λ _d1. … To λ _{dm + 1} , one of the downstream channels in one ONU device corresponds to one of the downstream channels of the OLT device;

The upstream channel in each ONU device matches one of the upstream channels in the OLT device, that is, the wavelength used by the upstream channel of each ONU is selected from the OLT upstream channel wavelength λ _u1 … to λ _{un + 1} , and one of the ONU devices The uplink channel corresponds to one of the uplink channels of the OLT device.

In the present invention, the PON system adds downlink channels and uplink channels at the OLT side at the same time, thereby completing system expansion, providing more options and higher bandwidth for the PON system, and meeting the increasing demand for users.

Among them, in FIG. 7, m = 1 and n = 1 are taken as an example to show a system structural block diagram of this embodiment. In actual setting, the values of m and n may be different according to requirements.

Example 9

Referring to FIG. 8, an embodiment of the present invention provides a capacity expansion system based on a passive optical network system. Based on Embodiment 8:

The ONU device includes at least 2 uplink channels, and each uplink channel of the ONU device matches any uplink channel of the OLT device.

This embodiment first expands the downlink channel of the OLT equipment of the PON system, then matches the ONU equipment with the expanded OLT equipment, and subsequently expands the downstream channel of the ONU equipment of the PON system. The system can also be expanded. Downlink capacity

On the basis of meeting the downstream capacity expansion of the OLT equipment side of the passive optical network system, according to user requirements and operational deployment, at least two uplink wavelength channels are added through the ONU equipment side to further achieve the purpose of increasing the uplink bandwidth capacity to a geometric multiple;

The formed at least two uplink wavelength channels use different wavelengths from the uplink channels of the existing system, and the new channels are integrated into the original ODN equipment by adding a multiplexer / demultiplexer to the OLT equipment.

It should be noted that the present invention first expands the downlink channel of the OLT device, so that the passive optical network system, that is, the PON system includes multiple downlink channels, and the PON system includes one OLT device, one ODN network, and multiple ONU devices connected in sequence. The downlink shares the bandwidth of the downlink wavelength channel it supports by broadcasting. The downlink channel adds m downlink channels, that is, after adding an original downlink channel, the PON system includes m + 1 downlink channels, and the wavelength of the downlink channel. Λ _d1 … to λ _{dm + 1 respectively} , where λ _d1 is the wavelength used by the original downlink channel;

The upstream channel of the OLT equipment is expanded, and the upstream channel is added with n uplink channels. That is, after adding an original uplink channel, the PON system includes n + 1 uplink channels, and the wavelengths of the upstream channels are λ _u1. … To λ _{un + 1} , where λ _u1 is the wavelength used by the original uplink channel;

At this time, the ONU device includes at least two uplink channels and one downlink channel. The downlink channel in each ONU device matches one of the downlink channels in the OLT device, that is, the wavelength used by the downlink channel of each ONU is the wavelength of the OLT downlink channel. λ _d1 … to λ _{dm + 1} , one of the downstream channels in one ONU device corresponds to one of the downstream channels of the OLT device;

Each upstream channel in each ONU device matches one of the upstream channels in the OLT device, that is, the wavelength used by the upstream channel of each ONU is selected from the OLT upstream channel wavelength λ _u1 … to λ _{un + 1} , and one of the ONUs Each uplink channel in the device corresponds to one of the uplink channels of the OLT device.

Among them, in FIG. 8, m = 1 and n = 1 are taken as examples to show the system structure block diagram of this embodiment. In actual setting, the values of m and n may be different according to requirements.

It should be noted that, in this embodiment, the ONU device includes at least two uplink channels. Therefore, a multiplexer is configured to the ONU device as needed, and the type of the multiplexer is selected according to the actual use situation.

Example 10

As shown in FIG. 9, an embodiment of the present invention provides a capacity expansion system based on a passive optical network system. Based on Embodiment 7, the ONU device includes at least two downlink channels, and each downlink channel of the ONU device is separately connected to the OLT device. Matches any of the downstream channels.

This embodiment first expands the downlink channel of the OLT equipment of the PON system, then matches the ONU equipment with the expanded OLT equipment, and then expands the upstream channel of the ONU equipment of the PON system to expand the capacity of the system. Capacity to meet different usage needs;

On the basis of meeting the downstream capacity expansion of the passive optical network system, according to user requirements and operational deployment, at least two downstream wavelength channels are set on the ONU equipment side to achieve the purpose of increasing the downstream bandwidth capacity to a geometric multiple;

At least two downlink wavelength channels use different wavelengths than the downlink channels of the existing system. By adding multiplexers and demultiplexers to the OLT equipment, the new channels are integrated into the original ODN network.

It should be noted that the present invention first expands the downlink channel of the OLT device, so that the passive optical network system, that is, the PON system includes multiple downlink channels, and the PON system includes one OLT device, one ODN network, and multiple ONU devices connected in sequence. The downlink shares the bandwidth of the downlink wavelength channel it supports by broadcasting. The downlink channel adds m downlink channels, that is, after adding an original downlink channel, the PON system includes m + 1 downlink channels, and the wavelength of the downlink channel. Λ _d1 … to λ _{dm + 1 respectively} , where λ _d1 is the wavelength used by the original downlink channel, and the uplink shares the uplink channel with wavelength λ _u1 by time division;

At this time, the ONU device includes an upstream channel and at least two downstream channels. The downstream channel in each ONU device matches one of the downstream channels in the OLT device, that is, the wavelength used by the downstream channel of each ONU is in the OLT downstream channel. The wavelengths λ _d1 … to λ _{dm + 1} are selected, and different downlink channels in one ONU device respectively correspond to one of the downlink channels of the OLT device;

Among them, in FIG. 9, taking m = 1 as an example, a system structural block diagram of this embodiment is shown.

It should be noted that, in this embodiment, the ONU device includes at least two downlink channels. If the ONU device is provided with only one receiving end or transmitting end, a demultiplexer must be configured to the ONU device. If the ONU device is provided with multiple At the receiving end, there is no need to configure a demultiplexer to the ONU equipment, and the type of the demultiplexer is selected according to the actual use situation.

Example 11

10, an embodiment of the present invention provides a capacity expansion system based on a passive optical network system. Based on Embodiment 7, the OLT device includes at least two uplink channels;

The OLT device includes at least two uplink channels and at least two downlink channels.

This embodiment first expands the downstream channel of the OLT equipment of the PON system, then matches the ONU equipment with the expanded OLT equipment, and then expands the upstream channel of the OLT equipment, and finally the upstream and downstream of the ONU equipment The capacity of the channel is expanded at the same time, so that the upstream channel and the upstream channel of the PON system can be expanded, and the upstream capacity and the downstream capacity of the system can also be expanded;

The formed at least two upstream wavelength channels and at least two downstream wavelength channels use different wavelengths from the existing system's upstream channels. The new channels are integrated into the original ODN network by adding multiplexers and demultiplexers to the OLT equipment.

It should be noted that the present invention first expands the downlink channel of the OLT device, so that the passive optical network system, that is, the PON system includes multiple downlink channels, and the PON system includes one OLT device, one ODN network, and multiple ONU devices connected in sequence. The downlink shares the bandwidth of the downlink wavelength channel it supports by broadcasting. The downlink channel adds m downlink channels, that is, after adding an original downlink channel, the PON system includes m + 1 downlink channels, and the wavelength of the downlink channel. Λ _d1 … to λ _{dm + 1 respectively} , where λ _d1 is the wavelength used by the original downlink channel;

The upstream channel of the OLT equipment is expanded, and the upstream channel is added with n uplink channels. That is, after adding an original uplink channel, the PON system includes n + 1 uplink channels, and the wavelengths of the upstream channels are λ _u1. … To λ _{un + 1} , where λ _u1 is the wavelength used by the original uplink channel;

At this time, the ONU device includes at least two uplink channels and at least two downlink channels. The downlink channels in each ONU device match one of the downlink channels in the OLT device, that is, the wavelength used by the downlink channels of each ONU is at the OLT. The downlink channel wavelengths λ _d1 … to λ _{dm + 1} are selected, and different downlink channels in one ONU device respectively correspond to one of the downlink channels of the OLT device;

Each upstream channel in each ONU device matches one of the upstream channels in the OLT device, that is, the wavelength used by the upstream channel of each ONU is selected from the OLT upstream channel wavelength λ _u1 … to λ _{un + 1} , and one of the ONUs Each uplink channel in the device corresponds to one of the uplink channels of the OLT device.

Among them, in FIG. 10, m = 1 and n = 1 are taken as an example to show the system structure block diagram of this embodiment. In actual setting, the values of m and n may be different according to requirements.

It should be noted that, in this embodiment, the ONU device includes at least two uplink channels. Therefore, the ONU device is configured with a multiplexer as required, and the model of the multiplexer is selected according to the actual use situation;

In addition, in this embodiment, the ONU device includes at least two downlink channels. Therefore, if the ONU device is provided with only one receiving end or transmitting end, a demultiplexer must be configured to the ONU device. If the ONU device is provided with multiple receiving channels, End, there is no need to configure a demultiplexer to the ONU equipment, and the type of the demultiplexer is selected according to the actual use situation.

Example 12

The embodiment of the present invention provides a capacity expansion system based on a passive optical network system. Based on Embodiment 7, the OLT device adds a PLOAM message and sends the PLOAM message to each ONU device. The ONU device adjusts the uplink transmission mode according to the PLOAM message. And obtain downlink channel information.

In this embodiment, after the expansion, on the OLT equipment side, an optical module transmission driving circuit with an extended wavelength is added to the physical layer, and waves of multiple downlink channels are combined into a multiplexer / demultiplexer for optical fiber transmission. The rate can be the same or different, and a higher rate downlink rate mode can be adopted. The wavelength channel rate of the downlink channel can be configured according to the network structure or system capacity requirements, and the expanded ODN network retains the existing deployment.

It should be noted that PLOAM stands for Physical Layer Operation, Administration and Maintenance, and the Chinese meaning is physical layer operation management and maintenance.

In this embodiment, on the OLT side, the expanded OLT equipment allows ONU equipment in the PON system to sense the structure of the PON system. The expanded OLT equipment needs to add a new PLOAM (physical layer OAM) message, which is a Wavelength Channel PLOAM message;

Assume that the OLT device has two downlink channels, the wavelength λ channel and the wavelength λ1 channel broadcast Wavelength Channel PLOAM (physical layer OAM) messages to inform all ONU equipment systems of the downstream wavelength channel information.

In the downstream wavelength λ channel, Wavelength Channel PLOAM informs that the downstream channel number is 0 and the center wavelength is λ;

In the downlink wavelength λ ₁ channel, Wavelength Channel PLOAM informs the downlink channel number 1 and the center wavelength λ ₁ ;

The ONU device adjusts the uplink transmission mode through the received Profile PLOAM (physical layer OAM) message. The ONU device obtains the downstream channel information of the ONU access through the received Wavelength Channel PLOAM (physical layer OAM) message; such as the physical sequence. The Wavelength Channel PLOAM received by the ONU device number SN1 is the downstream channel number 0 and the center wavelength is λ. This ONU device corrects the reception center frequency of the ONU optical module to reduce signal loss;

The ONU device records that the number of downstream channels supported by the ONU is 1, and the number of the downstream channel accessed is 0, which is reported to the OLT.

For ONU devices that support dual downstream channels, such as ONU devices with physical serial number SN2, they can receive two Wavelength Channel PLOAM messages from the downstream wavelength λ channel and the downstream wavelength λ ₁ channel. Similarly, the ONU device corrects the reception of the ONU optical module. Center frequency. It is also recorded that the number of downstream channels supported by the ONU is 2, and the channel numbers are 0 and 1.

The present invention is not limited to the above-mentioned preferred embodiments. Anyone can obtain other various forms of products under the inspiration of the present invention, but regardless of any changes in its shape or structure, all of them have the same or similar Similar technical solutions are within the scope of protection.

Claims (12)

A capacity expansion method based on a passive optical network system, which is applicable to a PON system in a time division multiplexing mode, is characterized in that the method includes the following steps: S1. Create a PON system, which includes one OLT device, one ODN network, and multiple ONU devices connected in sequence; S2. Expand the OLT equipment so that the OLT equipment is provided with at least one uplink channel and at least two downlink channels; S3. Each ONU device is provided with at least one uplink channel and at least one downlink channel. The uplink channel in each ONU device matches any uplink channel in the OLT device. The downlink channel in each ONU device is connected to the OLT device. Any downstream channel within the match. The method for expanding a capacity based on a passive optical network system according to claim 1, further comprising the following steps: Expand the capacity of the OLT equipment so that it contains at least 2 uplink channels, and each uplink channel of the ONU equipment is matched with any uplink channel of the OLT equipment. The method for expanding a capacity based on a passive optical network system according to claim 2, further comprising the following steps: Expand the capacity of the ONU equipment. There are at least 2 uplink channels in the ONU equipment, and each uplink channel of the ONU equipment is matched with any uplink channel in the OLT equipment. The method for expanding a capacity based on a passive optical network system according to claim 1, further comprising the following steps: Expand the capacity of the ONU equipment. There are at least two downlink channels in the ONU equipment. Each downstream channel of the ONU equipment is matched with any downstream channel in the OLT equipment. The method for expanding capacity based on a passive optical network system according to claim 1, characterized in that: the OLT equipment is expanded, and the OLT equipment is provided with at least two uplink channels; Expand the capacity of the ONU equipment. There are at least 2 uplink channels and at least 2 downlink channels in the ONU equipment. The capacity expansion method based on the passive optical network system according to claim 1, wherein after the OLT equipment is expanded, a PLOAM message is added, and the PLOAM message is sent to each ONU device, and the ONU device adjusts according to the PLOAM message Uplink sending mode and obtaining downlink channel information. A capacity expansion system based on a passive optical network system, which is suitable for a PON system in a time division multiplexing mode, is characterized in that the system includes: 1 OLT device, 1 ODN network, and multiple ONU devices connected in sequence; The OLT device is provided with at least one uplink channel and at least two downlink channels; Each ONU device is provided with at least one uplink channel and at least one downlink channel; the uplink channel in each ONU device matches any uplink channel in the OLT device, and the downlink channel in each ONU device is respectively Match with any downlink channel in the OLT device. The capacity expansion system based on the passive optical network system according to claim 7, characterized in that: The OLT device includes at least two uplink channels, and each uplink channel of the ONU device is matched with any uplink channel of the OLT device. The capacity expansion system based on the passive optical network system according to claim 8, characterized in that: The ONU device includes at least two uplink channels, and each uplink channel of the ONU device is matched with any uplink channel of the OLT device. The capacity expansion system based on the passive optical network system according to claim 7, wherein the ONU device includes at least two downlink channels, and each downlink channel of the ONU device is matched with any downlink channel of the OLT device. The capacity expansion system based on the passive optical network system according to claim 7, wherein the OLT device includes at least two uplink channels; The ONU device includes at least two uplink channels and at least two downlink channels. The capacity expansion system based on the passive optical network system according to claim 7, characterized in that: the OLT device adds a PLOAM message, and sends the PLOAM message to each ONU device, and the ONU device adjusts an uplink transmission mode according to the PLOAM message And obtain downlink channel information.

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