CN100413237C - Selective waveband light network structure for supporting communication in light network unit group - Google Patents
Selective waveband light network structure for supporting communication in light network unit group Download PDFInfo
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- CN100413237C CN100413237C CNB2005100279330A CN200510027933A CN100413237C CN 100413237 C CN100413237 C CN 100413237C CN B2005100279330 A CNB2005100279330 A CN B2005100279330A CN 200510027933 A CN200510027933 A CN 200510027933A CN 100413237 C CN100413237 C CN 100413237C
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Abstract
The present invention relates to a selective waveband passive light network structure for supporting communication in a light network unit group, which comprises a light line terminal, a plurality of light network units, a light branching device and optical fiber, wherein the light line terminal, the light network units, the light branching device and the optical fiber are connected in a tree structure; each light network unit and the light line terminal are both connected to the light branching device by the optical fiber; the light line terminal comprises an adjustable wave length transmitter, a wideband receiver and a dynamic waveband reflector; the adjustable wave length transmitter and the wideband receiver are connected with the dynamic waveband reflector by a circulator, and the other end of the dynamic waveband reflector is connected with the optical fiber; each light network unit is assigned with a fixing wave length transmitter and a fixing waveband receiver. The present invention avoids time delay because of the photoelectric light conversion of the light line terminal, largely speeds up communicating speed, and can simultaneously do business in a virtual private network and in a non virtual private network. Thus, the throughput of a network can be improved.
Description
Technical field
What the present invention relates to is a kind of optical network structure of technical field of optical fiber communication, a kind of selective waveband optical network system of supporting direct communication in the optical network unit group of saying so more specifically.
Background technology
EPON (PON) is the most promising development program in the optical access network.PON is made up of an optical line terminal (OLT) and N optical network unit (ONU), is a kind of light user network of setting the type distributed topology, and a network terminal communicates by optical fiber and a large number of users terminal.In PON, to ONU broadcast transmission packet, and each ONU sends packet by up channel to OLT with time-multiplexed form to OLT by down channel.For traditional PON, if need communication between the ONU, the ONU that at first makes a start issues OLT with packet.The OLT termination is received the packet from ONU, converts thereof into the signal of telecommunication, obtains purpose ONU, converts thereof into light signal again and is transmitted to receiving end ONU.The photoelectricity light conversion conversion of OLT end has constituted the electronic bottleneck in the whole transmission course.In the network of VPN (VPN) and super large computer cascade, the communication meeting between the part of O NU frequently in and other ONU between and communication between OLT and the ONU.In vogue day by day along with these networks overcomes electronic bottleneck, provides the direct high-speed traffic between the ONU to seem more and more important.In existing P ON structure, OLT is to ONU emission multi-wavelength's light signal, and these light signals are at the down channel wavelength division multiplexing.Each ONU selectively receives the light signal of respective wavelength according to control signal, control signal is included in and sends with the header form in the packet or send by independent wavelength channel, this structure can improve the capacity of down channel, but do not consider the direct communication between the ONU, the communication between the ONU still needs the forwarding by OLT.
Find through literature search prior art, support in the prior art of communication in the ONU group, people such as C.Chae are published in the article " A PON System Suitable for InternetworkingOptical Network Units Using a Fiber Bragg Grating on the Feeder Fiber (using Bragg grating to realize the interconnected PON system of optical network unit in the optical fiber branch line) " in scholarly publication " IEEE Photonics Technology Letters " (" IEEE photon technology wall bulletin ") 1999 the 11st volume, mention and between optical fiber branch line star coupler and OLT, placed a Bragg grating, this Bragg grating can reflect from the light of ONU and by coupler and be broadcasted to other ONU, does not need so just can realize communication between the ONU through OLT.The shortcoming of this technology is that each ONU needs two transmitters and two receivers, has increased the cost of system greatly.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of selective waveband optical network system of supporting communication in the optical network unit group is provided, make it realize direct communication between optical network units with less systematic cost, reduce communication delay between the optical network unit, and compatible mutually with traditional passive optical network structure.
The present invention is achieved by the following technical solutions, and the present invention is compatible mutually with traditional passive optical network structure, comprising: optical line terminal, some optical network units, optical branching device, an optical fiber are formed.Optical line terminal, optical network unit, optical branching device, optical fiber link to each other with tree, and each optical network unit and optical line terminal are connected in optical branching device by optical fiber.
Described optical line terminal is made up of wavelengthtunable transmitter, broadband receiver, dynamic wavestrip speculum, and the wavelengthtunable transmitter links to each other with dynamic wavestrip speculum by circulator with broadband receiver, and dynamically the other end of wavestrip speculum links to each other with optical fiber.
Described optical network unit is made up of fixed wavelength transmitter and fixed waveband receiver.Each optical network unit is assigned a fixing transmission wavelength, the fixing wavestrip that receives, and the fixing wavelength that sends is positioned at the fixing wavestrip that receives, and adjacent transmission wavelength is formed wavestrip, and the transmission wavelength of the optical network unit in the same VPN is formed a wavestrip.
The fixed wavelength transmitter of described optical network unit end is used for sending packet to other optical network units or optical line terminal with fixed wave length.
The fixed waveband receiver of described optical network unit end, the wavelength that receives from other optical network unit or optical line terminal is positioned at this fixing packet that receives wavestrip.For the optical network unit in the VPN, receive the packet of other all nodes in the VPN since then by the wavestrip receiver.
The wavelengthtunable transmitter of described optical line terminal, the node beyond other optical network units or EPON is sent out packet.By regulating the transmission wavelength of this wavelength-tunable transmitter, send packet to different optical network unit nodes.
The broadband receiver of described optical line terminal receives the packet from all optical network units and EPON exterior node.
The dynamic wavestrip speculum of described optical line terminal can lead directly to the packet by it on the one hand, can reflect the packet from optical network unit on the other hand, makes it be redirected to other optical network units.
Described optical branching device (or adopting the wavestrip multiplexer) between optical line terminal and optical network unit, is used for and will issues each optical network unit from the downstream message of optical line terminal along separate routes and will carry out multiplexing from the upstream message of each optical network unit.
Different with the traditional passive optical-fiber network, optical line terminal has increased dynamic wavestrip speculum, and this speculum is used to realize the direct communication of VPN interior lights network node.When two optical network units in the VPN intercom mutually, the dynamic wavestrip speculum of regulating optical line terminal is redirected to optical network unit with packet, the wavelength of this packet is positioned at the reception wavestrip of VPN optical network unit, and the wavestrip receiver that passes through in the VPN is received.Like this, the communication of optical network unit needn't pass through the optical link unit in the VPN, thereby the time delay of having avoided the photoelectricity light conversion of optical link unit side to bring has been quickened the speed that they are communicated by letter greatly.
Because the transmitter and receiver limited in number of optical line terminal, non-VPN interior business is carried out time division multiplexing in up link and down link respectively.The communication of optical network unit is without the optical link unit in the VPN, and they are not subjected to the restriction of optical link unit side, and business and non-virtual private network service can carry out simultaneously in the VPN, thereby can improve network throughput.
Description of drawings
Fig. 1 general structure block diagram of the present invention
Fig. 2 optical network unit sends the schematic diagram of packet to up link
Fig. 3 optical line terminal utilizes down link to send the schematic diagram of packet to optical network unit
The schematic diagram of communicating by letter between Fig. 4 VPN interior lights network element
Fig. 5 embodiment of the invention realizes schematic diagram
Embodiment
As shown in Figure 1, in the passive optical network, two virtual private network VPNs are arranged, there are two optical network unit ONU each VPN inside, there is an optical network unit ONU not belong to any VPN (with this passive optical network is example, but the interstitial content among VPN number and each VPN is not limited thereto structure in the EPON).As shown in the figure, each optical network unit ONU and optical line terminal OLT are interconnected with tree, optical network unit ONU 1 and optical network unit ONU 2 belong to first virtual private network VPN, their fixedly reception wavelength is positioned at same wavestrip, optical network unit ONU 3 and optical network unit ONU 4 belong to second virtual private network VPN, their fixedly reception wavelength is positioned at same wavestrip, optical network unit ONU 5 fixedly accept wavelength not in above-mentioned two wavestrips.Optical network unit ONU is modulated to this fixing transmission on the wavelength to send packet by fixed wavelength transmitter with packet; When optical network unit ONU received packet, wavestrip receiver receiver wavelength range was positioned at its all packets that receive wavestrip; Optical line terminal OLT sends packet by adjustable transmitter capable to optical network unit ONU; Optical line terminal OLT is by the packet of broadband receiver reception from all optical network unit ONU; All packets in adjustable its wavestrip of wavestrip mirror reflects, that is to say by regulating the wavestrip speculum, the intercommunicating packet of virtual private network VPN is redirected to other optical network unit ONU, and the optical network unit ONU in the virtual private network VPN receives packet by the wavestrip receiver.Occupy demand according to different channels, the communication in the EPON be divided into 4 kinds of situations, specifically introduce the working method of wavelength selection type EPON by describing their communication modes separately:
(1) optical network unit ONU is sent out packet to optical line terminal OLT, and optical network unit ONU sends its packet by fixed wavelength transmitter, and optical line terminal OLT receives this packet by broadband receiver.As shown in Figure 2.
(2) do not belong to communication between the optical network unit ONU between same virtual private network VPN, the optical network unit ONU of making a start sends packet by fixed wavelength transmitter, optical line terminal OLT receives packet by broadband receiver, analyze its destination through electric treatment then, optical line terminal OLT is adjusted to packet on the reception wavelength of corresponding purpose optical network unit ONU by the wavelength-tunable transmitter again and sends, and the purpose optical network unit ONU is accepted packet by the wavestrip receiver.Shown in Fig. 2 and 3.
(3) optical line terminal OLT is sent out packet to optical network unit ONU, optical line terminal OLT is adjusted to packet by the wavelength-tunable transmitter on the reception wavelength of purpose optical network unit ONU and sends, and the purpose optical network unit ONU is accepted packet by the wavestrip receiver.As shown in Figure 3.
(4) communication between the inner optical network unit ONU of virtual private network VPN, optical network unit ONU sends packet by fixed wavelength transmitter, its speculum regulated by adjustable wavestrip speculum so that packet is reflected onto all optical network unit ONU nodes when arriving speculum, the wavelength of this packet is positioned at the reception wavestrip of all optical network unit ONU fixed waveband receivers of VPN, so received by all optical network unit ONU in the VPN.As shown in Figure 4.
(5) because optical line terminal OLT has only a fixed waveband receiver, receive packet for fear of the optical line terminal OLT termination and produce conflict, the packet described in (1) and (2) carries out time division multiplexing in optical network unit ONU in the up channel of optical line terminal OLT.
(6) because optical line terminal OLT has only a wavelength-tunable transmitter, for fear of the transmitter conflict of optical line terminal OLT end, the packet in (2) and (3) carries out time division multiplexing in optical line terminal OLT in the down channel of optical network unit ONU.
(7) owing to the processing of the business in (4) without optical line terminal OLT, do not need to avoid the conflict of optical line terminal OLT end, but need to consider the restriction of optical network unit ONU end Receiver And Transmitter, an optical network unit ONU has only a fixed wavelength transmitter and a fixed waveband receiver, all wavelengths channel in the VPN wavestrip all is not used in up link and down link, and the VPN internal node can be communicated by letter.
As shown in Figure 5, be a kind of specific embodiment of the present invention.Contain a virtual private network VPN in the EPON, comprise two optical network unit ONU in the virtual private network VPN, dynamically the wavestrip speculum links to each other with the optical fiber of optical branching device by 12 kms, the dynamic reflective mirroring is from the packet of optical network unit ONU and straight-through packet from OLT, the dynamic adjustable speculum realizes that with the wavelength demultiplexer that has speculum fixed wavelength transmitter adopts the LD laser.The fixed transmission wavelength of optical network unit ONU 1 is 1547.8nm, and the fixed transmission wavelength of OLT is 1547.0nm, and the reception length of the wave band filter of optical network unit ONU 2 is 1547.4 ± 2nm.Embodiment demonstrated OLT to 2 packets of optical network unit ONU and optical network unit ONU 1 to two kinds of situations of 2 packets of optical network unit ONU.
In this selective waveband optical network system, business in the virtual private network VPN is without the processing of OLT end, directly be redirected to the purpose optical network unit ONU by adjustable wavestrip speculum, significantly reduced processing delay, also avoid OLT end transmitter and receiver to limit the conflict that brings, thereby increased the throughput of network.
Claims (8)
1. support the interior selective waveband optical network system of communicating by letter of optical network unit group for one kind, comprise: optical line terminal, some optical network units, optical branching device, optical fiber, it is characterized in that, optical line terminal, optical network unit, optical branching device, optical fiber link to each other with tree with EPON, and each optical network unit and optical line terminal all are connected in optical branching device by optical fiber; Optical line terminal is made up of wavelengthtunable transmitter, broadband receiver, dynamic wavestrip speculum, and the wavelengthtunable transmitter links to each other with dynamic wavestrip speculum by circulator with broadband receiver, and dynamically the other end of wavestrip speculum links to each other with optical fiber; Optical network unit is made up of fixed wavelength transmitter, fixed waveband receiver.
2. the selective waveband optical network system of communication is characterized in that described fixed wavelength transmitter sends packet to other optical network unit or optical line terminal with fixed wave length in the support optical network unit group as claimed in claim 1.
3. the selective waveband optical network system of communication in the support optical network unit group as claimed in claim 1, it is characterized in that, described fixed waveband receiver, the wavelength that receives from other optical network unit or optical line terminal is positioned at this fixing packet that receives wavestrip.
4. as claim 1 or the interior selective waveband optical network system of communicating by letter of 2 or 3 described support optical network unit groups, it is characterized in that, described optical network unit, each optical network unit distributes a fixing transmission wavelength, the fixing wavestrip that receives, the fixing wavelength that sends receives in the wavestrip fixing, adjacent transmission wavelength is formed a wavestrip, the transmission wavelength of the optical network unit in the same VPN is positioned at a wavestrip, when optical network unit sent packet, fixed wavelength transmitter was modulated to the fixing wavelength that sends with packet.
5. the selective waveband optical network system of communication in the support optical network unit group as claimed in claim 1, it is characterized in that, described dynamic wavestrip speculum, reflection wavelength is positioned at all packets of this wavestrip, makes packet retargetable that optical network unit the sends out other optical network unit to VPN inside.
6. the selective waveband optical network system of communication in the support optical network unit group as claimed in claim 1, it is characterized in that, described optical branching device or employing wavestrip multiplexer, between optical line terminal and optical network unit, be used for and issue each optical network unit from the downstream message of optical line terminal along separate routes and will carry out multiplexing from the upstream message of each optical network unit.
7. the selective waveband optical network system of communication in the support optical network unit group as claimed in claim 1, it is characterized in that, described optical network unit, to packet that optical line terminal is sent out and optical network unit to the packet that optical network unit is sent out of other VPN in the up link time division multiplexing of optical network unit to optical line terminal; Optical line terminal arrives the down link time division multiplexing of optical network unit at optical line terminal to the packet that optical network unit is sent out of other VPN to packet that optical network unit is sent out and optical network unit.
8. as claim 1 or the interior selective waveband optical network system of communicating by letter of 7 described support optical network unit groups, it is characterized in that, described optical network unit, during the intercommunication of the optical network unit in the same VPN, the dynamic wavestrip speculum that is positioned at optical line terminal is redirected to each optical network unit with packet, and other optical network unit receives packet by wave band filter in this VPN.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452682C (en) * | 2006-06-08 | 2009-01-14 | 上海交通大学 | Method for implementing whole optical virtual private network in passive optical network |
| CN102325083B (en) * | 2006-11-09 | 2014-11-05 | 华为技术有限公司 | Bandwidth allocation method and device for passive optical network (PON) with different transmission rates |
| CN101330764B (en) * | 2008-06-20 | 2010-09-08 | 北京邮电大学 | Method for direct communication between optical network units and passive optical network system |
| CN101674498B (en) | 2008-09-12 | 2013-03-20 | 华为技术有限公司 | Method, equipment and system for transmitting constant-rate data stream |
| CN107453817A (en) * | 2017-07-10 | 2017-12-08 | 武汉邮电科学研究院 | A kind of passive optical network based on time-division and wavelength-division multiplex |
| CN117319845A (en) * | 2022-06-24 | 2023-12-29 | 中兴通讯股份有限公司 | Enhanced optical network unit, passive optical network and communication method |
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| US20040013360A1 (en) * | 2002-07-22 | 2004-01-22 | Smets Rob C J | Reflective splitting passive optical network |
| CN1497894A (en) * | 2002-10-01 | 2004-05-19 | Dense wave division multiplex passive optical network system for self-implant locked Fabry-Perot laser diode | |
| CN1593027A (en) * | 2001-09-28 | 2005-03-09 | 英特尔公司 | Method and apparatus for transmission of upstream data in an optical network |
| US20050074239A1 (en) * | 2003-10-02 | 2005-04-07 | Nokia Corporation | Secure upstream transmission in passive optical networks |
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2005
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Patent Citations (4)
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|---|---|---|---|---|
| CN1593027A (en) * | 2001-09-28 | 2005-03-09 | 英特尔公司 | Method and apparatus for transmission of upstream data in an optical network |
| US20040013360A1 (en) * | 2002-07-22 | 2004-01-22 | Smets Rob C J | Reflective splitting passive optical network |
| CN1497894A (en) * | 2002-10-01 | 2004-05-19 | Dense wave division multiplex passive optical network system for self-implant locked Fabry-Perot laser diode | |
| US20050074239A1 (en) * | 2003-10-02 | 2005-04-07 | Nokia Corporation | Secure upstream transmission in passive optical networks |
Non-Patent Citations (2)
| Title |
|---|
| A PON System Suitable for Internetworking Optical NetworkUnits Using a Fiber Bragg Grating on the Feeder Fiber. Chang-Joon Chae,Seung-Tak Lee,Geun-Young Kim andHeesang Park.IEEE Photonics Technology Letter,Vol.Vol.11 No.No.12. 1999 |
| A PON System Suitable for Internetworking Optical NetworkUnits Using a Fiber Bragg Grating on the Feeder Fiber. Chang-Joon Chae,Seung-Tak Lee,Geun-Young Kim andHeesang Park.IEEE Photonics Technology Letter,Vol.Vol.11 No.No.12. 1999 * |
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