CN101505440B - Bidirectional IP converting CATV optical fiber network based on PON - Google Patents
Bidirectional IP converting CATV optical fiber network based on PON Download PDFInfo
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- CN101505440B CN101505440B CN2009100607719A CN200910060771A CN101505440B CN 101505440 B CN101505440 B CN 101505440B CN 2009100607719 A CN2009100607719 A CN 2009100607719A CN 200910060771 A CN200910060771 A CN 200910060771A CN 101505440 B CN101505440 B CN 101505440B
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Abstract
The invention discloses a two-way IP CATV optical fiber network based on PON, which comprises an optical line terminal, a light distribution network and an optical network unit connected one by one, wherein a PON data interface lower-connection module is arranged in the optical line terminal and is used for sending and receiving optical data signals of the optical line terminal; a PON data interface upper-connection module is arranged in the optical network unit and is used for sending and receiving optical data signals of the optical network unit; and an IP video interface lower-connection module is also arranged in the optical line terminal and is used for sending IP video signals of the optical line terminal. The network has the advantages of upgrading the bandwidth of the prior PON data network, improving the bearing capacity and transmission efficiency of the PON data network for video service, greatly applying to the two-way IP transformation of CATV optical fiber networks and simultaneously applying to the bearing optimization of telecommunication access networks for IPTV service.
Description
Technical field
The invention belongs to the Optical Access Network field, be specifically related to CATV (cable TV) optical networking that two-way IP (Internet Protocol) changes.
Background technology
Along with professional popularization such as Web TV (IPTV), video request program (VOD), and the demand that multi-service is merged transmission, many net unifications, traditional optical CATV network more and more can not satisfy user's demand at present, it is carried out two-way IPization transformation become a kind of trend.EPON (PON) technology has high bandwidth, advantage such as non-maintaining, has become the generally acknowledged technology of carrying out the two-way IPization transformation of CATV optical networking that is best suited for.At present, the user is more and more higher to the needs of high-quality video business, with the rate bit stream of one road high definition video steaming is that the rate bit stream of 10Mb/s, the clear video flowing of a road sign is that 2Mb/s calculates, if provide 250 cover SD programs and 20 cover high definition programs will need the 700Mb/s bandwidth, in the conventional P ON network, this video traffic will be broadcast in the downlink data channel of each PON port, occupy a large amount of bandwidth, and its efficiency of transmission is quite low.
Summary of the invention
Technical problem to be solved by this invention is: a kind of bidirectional IP converting CATV optical fiber network based on PON is provided, improve the network bandwidth and service bearer ability simultaneously, can satisfy professional requirement such as high-quality video TV, VOD, finish multi-service and merge, net more unification network.
To achieve these goals, technical scheme of the present invention comprises:
The optical line terminal of Xiang Lianing, Optical Distribution Network and optical network unit successively;
PON data-interface second line of a couplet module is housed in the described optical line terminal, is used for optical line terminal and sends and receive the light data-signal;
PON data-interface first line of a couplet module is housed in the described optical network unit, is used for optical network unit and receives and send the light data-signal;
IP video interface second line of a couplet module also is housed in the described optical line terminal, is used for optical line terminal and sends the IP vision signal;
IP video interface first line of a couplet module also is housed in the described optical network unit, is used for optical network unit and receives the IP vision signal.
Advantage of the present invention: can improve the network bandwidth, service bearer ability and the efficiency of transmission of CATV optical networking simultaneously, can satisfy professional requirement such as high-quality video TV, VOD, finish multi-service and merge, net more unification to network.The present invention is highly suitable for the two-way IPization transformation of CATV optical networking, also is applicable to simultaneously to optimize the carrying of telecommunications access network to the IPTV business.
Description of drawings
Fig. 1 is the bidirectional IP converting CATV optical fiber network structural representation based on PON of the present invention;
Fig. 2 is an optical line terminal OLT device for carrying out said internal structure schematic diagram of the present invention;
Fig. 3 is an optical network unit ONU device for carrying out said internal structure schematic diagram of the present invention.
Embodiment
Core concept of the present invention is: by increase the mode of the one road independent down going channel that is exclusively used in IP video multicast data again on the basis of existing EPON or GPON data transmission system, promote Network Transmission bandwidth and video traffic bearing capacity thereof, have quite high video transmission efficient, satisfy in the two-way IPization transformation of CATV optical networking demand high bandwidth, integrated services.
According to above-mentioned thinking, a kind of new network transmission system based on the PON technology is proposed, described transmission system has been inherited the bidirectional data path of PON, on the basis of up time-division data channel, downlink broadcast data channel, increased by one the tunnel in addition again and be exclusively used in the descending multicast channel that the IP video multicasting transmits, improved the efficiency of transmission of IP video traffic and guaranteed its service quality (QoS).Described three paths adopt the mode of wavelength division multiplexing to transmit in simple optical fiber, and the up-downgoing data channel adopts 1310nm and 1490nm wavelength respectively, and downstream IP video traffic multicast channel adopts the 1550nm wavelength.
Below in conjunction with accompanying drawing preferred implementation of the present invention is elaborated.
Fig. 1 is a kind of bidirectional IP converting CATV optical fiber network structural representation based on PON of the present invention.
Bidirectional IP converting CATV optical fiber network based on PON comprises:
The optical line terminal OLT of Xiang Lianing, Optical Distribution Network ODN and optical network unit ONU successively; Optical line terminal OLT equipment provides several PON optical ports to be connected to Optical Distribution Network ODN, and described ODN distributes the back to be connected with some optical network unit ONU through light signal;
PON data-interface second line of a couplet module is housed in the described optical line terminal, is used for optical line terminal and sends and receive the light data-signal;
PON data-interface first line of a couplet module is housed in the described optical network unit, is used for optical network unit and receives and send the light data-signal;
IP video interface second line of a couplet module also is housed in the described optical line terminal, is used for optical line terminal and sends the IP vision signal;
IP video interface first line of a couplet module also is housed in the described optical network unit, is used for optical network unit and receives the IP vision signal.
As shown in Figure 2, backboard can be housed in the described optical line terminal and converge Switching Module; Described backboard converges connecting port is housed in the Switching Module, converges interface, and described IP video interface second line of a couplet module is positioned at backboard and converges Switching Module; The IP vision signal that described upward connecting port receives is forwarded to described IP video interface second line of a couplet module, exports light signal then; All the other signal forwarding that described upward connecting port receives are exported the signal of telecommunication then to the described interface that converges; The described interface that converges links to each other with described PON data-interface second line of a couplet module, by PON data-interface second line of a couplet module output light signal.
The described interface that converges can have N (N is a natural number) individual, and described PON data-interface second line of a couplet module has N, and N wavelength division multiplexer is housed in the described optical line terminal; Described IP video second line of a couplet module is connected to optical branching device Splitter, along separate routes than being 1: N, the output of optical branching device Splitter all links to each other with all wavelength division multiplexers; Each converges interface and is connected to a PON data-interface second line of a couplet module, and each PON data-interface second line of a couplet module is connected to a wavelength division multiplexer.
As shown in Figure 3, in the described optical network unit Ethernet crosspoint can be housed, described Ethernet crosspoint all links to each other with described PON data-interface first line of a couplet module, described IP video interface first line of a couplet module.
Described Ethernet crosspoint is connected to user port; At up direction, described Ethernet crosspoint receives the data that send from user port, is transmitted to PON data-interface first line of a couplet module then, in specific time slot on transmission; At down direction, described Ethernet crosspoint receives the downlink data that transmits from PON data-interface first line of a couplet module, and from the downstream IP video data that IP video interface first line of a couplet module transmits, and sends to user port after converging circulation then.
Described Optical Distribution Network can be made up of the passive light splitter, adopts one-level beam split or multistage beam-splitting structure.
Described IP video interface second line of a couplet module sends the method for IP vision signal, can adopt the down direction multicast.
Described PON data-interface second line of a couplet module sends the method for light data-signal, adopts down direction broadcasting; Described PON data-interface second line of a couplet module receives the method for light data-signal, adopts the up direction time division multiplexing.
Described IP video interface second line of a couplet module sends before the IP vision signal, can earlier the CATV analog signal conversion be become digital signal, and be packaged into the ethernet ip Frame, be i.e. the IP vision signal.
Down direction: the light data-signal that light signal that described optical line terminal sends and described optical network unit receive, wavelength can be 1490nm; The IP vision signal that IP vision signal that described optical line terminal sends and described optical network unit receive, wavelength can be 1550nm;
Up direction: the light signal that light data-signal that described optical network unit sends and described optical line terminal receive, wavelength can be 1310nm.
Embodiment:
As shown in Figure 1, according to the bidirectional IP converting CATV optical fiber network of above-mentioned preferred implementation composition based on PON.Described OLT provides up-down bidirectional data service channel and a tunnel to be exclusively used in the down going channel of IP video multicasting to optical network unit ONU equipment.OLT provides n (n is a natural number) individual PON optical port, i.e. a PON optical port, the 2nd PON optical port ... the nPON optical port; Comprise three road light signals in each PON optical port: the IP video multicast light signal of the data light signal of up 1310nm wavelength, the data light signal of descending 1490nm wavelength and descending 1550nm wavelength, three road signals are coupled to back transmission downwards in the simple optical fiber by the mode of wavelength division multiplexing.Transmission Fibers has the n bar.
Described ODN is used to converge up smooth data-signal, simultaneously the light signal break into portions of descending smooth data service and downstream IP video multicasting is delivered to optical network unit ONU.ODN adopts the passive light splitter to realize, can adopt one or more levels beam-splitting structure, transfers to each ONU by the ODN interface after light signal is branched off into some parts.For guaranteeing the flatness of three band of light decay of 1310nm, 1490nm and 1550nm, described passive light splitter adopts planar optical waveguide device to realize.ODN comprises the first optical branching device splitter1, the second optical branching device splitter2 ... n optical branching device splittern also has n.The first optical branching device splitter1 also is connected to n optical network unit, i.e. the 11st optical network unit ONU 11, the 12 optical network unit ONU 12 ... 1n optical network unit ONU 1n; All the other optical branching devices also are connected to n optical network unit respectively, and until n optical branching device splittern, it is connected to n1 optical network unit ONU n1, n2 optical network unit ONU n2 ... nn optical network unit ONU nn.Described ONU transmits upstream data service in specific time slot, converge downstream data traffic and downstream IP video multicasting simultaneously, and several user interfaces are provided.
Fig. 2 is an OLT device for carrying out said internal structure schematic diagram of the present invention.It comprises n EPON (Ethernet passive optical network) or GPON (gigabit passive optical network) data-interface second line of a couplet module, and backboard converges Switching Module, passive optical splitter Splitter.It also comprises the individual wavelength division multiplex device of n (n is a natural number), the i.e. first wavelength division multiplexer WDM1, the second wavelength division multiplexer WDM2 ... n wavelength division multiplexer WDMn etc.Described EPON (or GPON) data-interface second line of a couplet module adopts the special-purpose OLT MAC of EPON (or GPON) chip to realize, up/descending smooth data-signal can be provided, and finishes the broadcasting with downstream data traffic of converging of upstream data service.
Described backboard converges Switching Module and adopts big capacity Ethernet switching chip to realize, that can finish a plurality of PON data-interfaces converges, provides unified functions such as first line of a couplet network interface, and downstream IP video multicast data-interface also is provided in addition.As shown in Figure 2, backboard converges Switching Module and comprises connecting port, IP video interface second line of a couplet module, and n that also is provided for converging the PON data is converged interface, promptly first converges interface, second and converges interface ... n converges interface.Backboard converges Switching Module and uses the special switching technology of Ethernet, finishes data forwarding and exchange between each interface simultaneously.The forwarding rule realization of converging exchange chip by the definition backboard will be gone up the received video multicast data of connecting port and all will be redirected to IP video interface second line of a couplet module.IP video interface second line of a couplet module is carried all video multicastings, and this interface module generates downstream IP video multicasting light signal by the optical transmitter of 1550nm wavelength.
Described EPON (or GPON) data-interface second line of a couplet module comprises special-purpose OLT media interviews control (MAC) chip of EPON (or GPON) and optical interface.Each EPON (or GPON) data-interface second line of a couplet module, be connected to the corresponding interface that converges that backboard converges Switching Module in first line of a couplet direction in the mode of the signal of telecommunication, promptly an EPON (or GPON) data-interface second line of a couplet module is connected to first and converges interface, and the 2nd EPON (or GPON) data-interface second line of a couplet module is connected to second and converges interface ... nEPON (or GPON) data-interface second line of a couplet module is connected to n and converges interface.In second line of a couplet direction, it is that 1310nm, downstream wavelength are the light signal of 1490nm that each EPON (or GPON) data-interface second line of a couplet module provides up wavelength by optical interface.
It is the light signal of 1550nm that the IP video interface second line of a couplet module that described backboard converges Switching Module provides downstream wavelength, after by optical branching device splitter downlink optical signal being divided into n part, up/the downlink optical signal that is provided with every road EPON (or GPON) data-interface second line of a couplet module, at the first wavelength division multiplexer WDM1, the second wavelength division multiplexer WDM2 ... n wavelength division multiplexer WDMn carries out wavelength division multiplexing in the place, then respectively by a PON optical port, the 2nd PON optical port ... the nPON optical port is coupled in the respective transmissions optical fiber to the ONU of subordinate device transmission.
Fig. 3 is an ONU device for carrying out said internal structure schematic diagram of the present invention.ONU is used to send up smooth data-signal, receives descending smooth data-signal and downstream IP video multicast signal, and offers user port after downstream data traffic and IP video multicasting converged circulation.
ONU comprises wavelength division multiplexer WDM, EPON (or GPON) data-interface first line of a couplet module, IP video interface first line of a couplet module and Ethernet crosspoint.Wherein EPON (or GPON) data-interface first line of a couplet module adopts special-purpose ONU MAC chip and optical transceiver module to realize that optical transceiver module comprises optical transmitter and optical receiver; IP video interface first line of a couplet module is finished simple opto-electronic conversion, adopts the normal optical receiver to realize; The Ethernet crosspoint can adopt and can realize by the self-defined special exchange chip of transmitting rule, finish the exchange of EPON (or GPON) data-interface first line of a couplet module and IP video interface first line of a couplet data that module transmits and converge, provide several user interfaces to be connected to subscriber terminal equipment simultaneously.ONU receives the signal that transmits from ODN, passes through wavelength division multiplexer WDM then with light data-signal and the beam split of IP video multicast signal, reaches EPON (or GPON) data-interface first line of a couplet module and IP video interface first line of a couplet module respectively.
In the uplink direction, the Ethernet crosspoint receives the data that send from user port, be transmitted to then EPON (or GPON) data-interface first line of a couplet module in specific time slot on transmission; At down direction, the Ethernet crosspoint transfers to user port after downstream data traffic and downstream IP video multicasting are converged circulation.
The present invention is not restricted to listed utilization in specification and the execution mode.For a person skilled in the art, can make various corresponding changes and modification, and all these corresponding changes and modification all belong to the protection range of claim of the present invention according to the present invention.
Claims (9)
1. based on the bidirectional IP converting CATV optical fiber network of PON, comprising:
The optical line terminal of Xiang Lianing, Optical Distribution Network and optical network unit successively;
PON data-interface second line of a couplet module is housed in the described optical line terminal, is used for optical line terminal and sends and receive the light data-signal;
PON data-interface first line of a couplet module is housed in the described optical network unit, is used for optical network unit and receives and send the light data-signal;
It is characterized in that,
IP video interface second line of a couplet module also is housed in the described optical line terminal, is used for optical line terminal and sends the IP vision signal;
IP video interface first line of a couplet module also is housed in the described optical network unit, is used for optical network unit and receives the IP vision signal;
Backboard also is housed in the described optical line terminal converges Switching Module;
Described backboard converges and connecting port is housed in the Switching Module and converges interface, and described IP video interface second line of a couplet module is positioned at backboard and converges Switching Module;
The IP vision signal that described upward connecting port receives is forwarded to described IP video interface second line of a couplet module, and all the other signal forwarding that described upward connecting port receives are to the described interface that converges;
The described interface that converges links to each other with described PON data-interface second line of a couplet module.
2. CATV optical networking as claimed in claim 1 is characterized in that: the Ethernet crosspoint also is housed in the described optical network unit, and described Ethernet crosspoint all links to each other with described PON data-interface first line of a couplet module, described IP video interface first line of a couplet module.
3. CATV optical networking as claimed in claim 1 is characterized in that:
The described interface that converges has N, and described PON data-interface second line of a couplet module has N, and N wavelength division multiplexer is housed in the described optical line terminal;
Described IP video interface second line of a couplet module is connected to optical branching device, along separate routes than being 1: N, the output of optical branching device all links to each other with all wavelength division multiplexers;
Each converges interface and is connected to a PON data-interface second line of a couplet module, and each PON data-interface second line of a couplet module is connected to a wavelength division multiplexer.
4. as each described CATV optical networking of claim 1～3, it is characterized in that: described Optical Distribution Network is made up of the passive light splitter, adopts one-level beam split or multistage beam-splitting structure.
5. as each described CATV optical networking of claim 1～3, it is characterized in that: described IP video interface second line of a couplet module sends the method for IP vision signal, adopts the down direction multicast.
6. as each described CATV optical networking of claim 1～3, it is characterized in that: described PON data-interface second line of a couplet module sends the method for light data-signal, adopts down direction broadcasting; Described PON data-interface second line of a couplet module receives the method for light data-signal, adopts the up direction time division multiplexing.
7. as each described CATV optical networking of claim 1～3, it is characterized in that: described IP video interface second line of a couplet module sends before the IP vision signal, earlier the CATV analog signal conversion is become digital signal, and be packaged into the ethernet ip Frame, be i.e. the IP vision signal.
8. CATV optical networking as claimed in claim 2 is characterized in that:
Described Ethernet crosspoint is connected to user port;
At up direction, described Ethernet crosspoint receives the data that send from user port, is transmitted to PON data-interface first line of a couplet module then, in specific time slot on transmission;
At down direction, described Ethernet crosspoint receives the downlink data that transmits from PON data-interface first line of a couplet module, and from the downstream IP vision signal that IP video interface first line of a couplet module transmits, and sends to user port after converging circulation then.
9. as each described CATV optical networking of claim 1～3, it is characterized in that,
Down direction: the light data-signal that light data-signal that described optical line terminal sends and described optical network unit receive, wavelength is 1490nm; The IP vision signal that IP vision signal that described optical line terminal sends and described optical network unit receive, wavelength is 1550nm;
Up direction: the light data-signal that light data-signal that described optical network unit sends and described optical line terminal receive, wavelength is 1310nm.
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| CN102799160A (en) * | 2012-08-08 | 2012-11-28 | 武汉长光科技有限公司 | PON (Passive Optical Network)-based power transmission line induction monitoring device |
| CN103974151B (en) * | 2013-02-05 | 2019-02-12 | 中兴通讯股份有限公司 | The sending method and the same axle unit of light of downlink message in a kind of Opto-electronic system |
| CN106992817B (en) * | 2017-05-17 | 2023-08-18 | 华数传媒网络有限公司 | Light receiving device and equipment |
| CN107612623A (en) * | 2017-09-05 | 2018-01-19 | 深圳市微风通讯技术有限公司 | A kind of multi-service expanding communication equipment |
| CN107592159A (en) * | 2017-09-29 | 2018-01-16 | 深圳达实智能股份有限公司 | A kind of intelligent building optical network system and optical network apparatus |
| CN109600167B (en) * | 2018-11-27 | 2021-09-03 | 成都成电光信科技股份有限公司 | Digital array radar optical fiber transmission network and control method thereof |
| CN109600169A (en) * | 2018-11-28 | 2019-04-09 | 青岛海信宽带多媒体技术有限公司 | A kind of video reception optical module and optical network unit |
| CN110312174A (en) * | 2019-07-23 | 2019-10-08 | 上海地面通信息网络股份有限公司 | A kind of private line network access system |
| CN111654759A (en) * | 2020-05-05 | 2020-09-11 | 上海云则信息技术有限公司 | IP video transmission system |
| CN114071265A (en) * | 2021-11-15 | 2022-02-18 | 太仓市同维电子有限公司 | System, method, device, processor and storage medium for realizing electromagnetic compatibility test for PON uplink telecommunication terminal |
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