CN101197638B - hybrid passive optical network system - Google Patents
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- CN101197638B CN101197638B CN2007101722946A CN200710172294A CN101197638B CN 101197638 B CN101197638 B CN 101197638B CN 2007101722946 A CN2007101722946 A CN 2007101722946A CN 200710172294 A CN200710172294 A CN 200710172294A CN 101197638 B CN101197638 B CN 101197638B
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Abstract
The invention relates to a mixed type passive optical network system which comprises a plurality of optical line terminals, a coarse wavelength division multiplexing and demultiplexing device, an optical branching device, and a plurality of optical network units, wherein, each optical line terminal occupies two different wavelengths of coarse wavelength division multiplexing standards, and the two different wavelengths are respectively used for transmitting optical signals of a transmitting end and a receiving end of the optical line terminal; the optical branching device is provided with a plurality of ports and connected with the coarse wavelength division multiplexing and demultiplexing device through an optical fiber; the network units are connected with corresponding ports of the optical branching device through optical communication. The invention adopts mature coarse wavelength division technologies to make a plurality of mutually independent EPON systems enter into a single optical fiber through simultaneous superposition of different CWDM optical wavelengths and simultaneously be shared by each ONU through the optical branching device. By adoption of the topological structure, the invention has the advantages of great conversation of optical fiber resources connected between metropolitan area networks and cells, simultaneous further exertion of EPON advantages, capability of flexibly increasing user number, reduction of cost of each line, and acceleration of promotion of an EPON network.
Description
Technical field
The present invention relates to EPON (PON) system.
Background technology
EPON (PON) provides being connected of optical line terminal (OLT) and a plurality of optical network units (ONU); Share OLT to the optical fiber medium between the distant-end node (RN); Have cost low, be convenient to safeguard, to advantages such as miscellaneous service are transparent; While PON transition to optical fiber smoothly arrives family (FTTH), thereby has fine development prospect.
Ethernet passive optical network (EPON) is a power Splittable EPON, adopts star coupler along separate routes, on/descending transmission adopts time division multiple access (TDMA)/Time Division Multiplexing mode to realize the shared channel bandwidth.It is the mode that adopts luminous power to distribute, and this has limited ONU quantity, and has influenced the further network capacity extension.
1 OLT can be installed on the every optical fiber of traditional EPON system carry 32 tunnel user.Although saving that can be a large amount of than traditional transmission means fiber resource because domestic original fiber resource is not enough, still had a strong impact on the development of EPON.If lay optical fiber again, this will cause whole network cost very expensive, existing network caused to seriously influence simultaneously.
Technical scheme provided by the invention relates to existing CWDM (CWDM) system, i.e. coarse wavelength division multiplexer system, and it is attached to transmit in the optical fiber through the wavelength that utilizes optical multiplexer and will in different fiber, transmit and realizes.At the receiving terminal of link, utilize the wavelength after demodulation multiplexer will decompose to deliver to different fibers respectively, receive the different received machine.The channel spacing of CWDM is 20nm, and the channel spacing of DWDM does not wait from 0.2nm to 1.2nm, so with respect to dense wave division multipurpose (DWDM) system, CWDM is called coarse wave division multiplexing technology.
Summary of the invention
The objective of the invention is to, a kind of hybrid passive optical network system is provided.
For reaching above-mentioned purpose, the present invention adopts following technical scheme:
A kind of hybrid passive optical network system comprises:
A plurality of optical line terminals, each optical line terminal take two different wave lengths of CWDM standard, and two different wave lengths are respectively applied for the transmission of the light signal of optical line terminal transmitting terminal and receiving terminal;
Multiplexing device is conciliate in CWDM, is used for the wavelength optical signals of said a plurality of optical line terminals is transmitted on simple optical fiber;
Be provided with the optical branching device of a plurality of ports, conciliate multiplexing device with said CWDM and be connected, be used for the luminous power on the optical fiber is assigned to each port through optical fiber;
A plurality of optical network units are connected with the optical communication of optical branching device corresponding port, and said optical network unit adopts with two identical optical wavelength of corresponding optical line terminal and transmits the uplink and downlink data respectively.
The present invention has the following advantages:
1, utilizes ripe CWDM (CWDM) technology in simple optical fiber, to superpose the EPON system, save the optical fiber cost of metropolitan area network, enlarge whole PON network of network scope.
2, can realize that a plurality of EPON network equipments place in the same core machine room, be convenient to unified network performance maintenance and management.
3, can make EPON on original basis, increase tens of times transmission bandwidth through the CWDM technology, insert quantity thereby increase tens of times user.
4, adopt the light signal of the intermodule OLT of CWDM to converge on the optical fiber at local side; Save the line loss of light; The mode that adopts optical branching device to utilize light intensity to distribute at far-end is connected the port that makes ONU and splitter and has nothing to do with ONU, greatly reduce on practice of construction the trouble caused in order to distinguish wavelength.
5,, make the direct light signal that can filter inoperative, a light signal through operation wavelength at ONU built-in optical filter plate; In practical application; The workmen need not carry out the output wavelength test of each splitter, only needs directly to be connected with splitter to get final product, and has reduced mounting hardness.
6, the ONU side has adopted the Distributed Feedback Laser of CWDM standard, makes whole system be operated in 1400～1600 wave bands, can effectively avoid the 1310nm wave band in traditional cable TV, can mix with traditional cable network and use.
7, the OLT unification is positioned in the core computer lab management, and need not image intensifer.In sub-district machine room or building, passive devices such as the demodulation multiplexer of a light that the needs placement is temperature independent and optical branching device effectively increase the useful life of circuit, and have reduced the maintenance cost of network.
8, the device that uses among the present invention all can adopt ripe device, and cost is low, and reliability is high.
9, network system provided by the invention when bandwidth upgrading, need not carried out big transformation to network, reduces the upgrade of network cost.
Description of drawings
Fig. 1 is an embodiment of the invention structural representation.
Embodiment
As shown in Figure 1, a kind of hybrid passive optical network system comprises:
The optical line terminal of a plurality of ether optical-fiber networks (OLT) 10, promptly the OLT1, OLT2, OLT3 among the figure ..., OLTn, each optical line terminal 10 takies two different wave lengths of CWDM (CWDM) standard.For example, OLT1 is respectively λ 1, λ 1 ', and OLT2 is respectively λ 2, λ 2 '; OLT3 is respectively λ 3, λ 3 '; OLTn is respectively λ n, λ n '.Be respectively applied for the transmission of the light signal of OLT transmitting terminal and receiving terminal.Wherein, the transmitting terminal of OLT can adopt distributed feedback bragg grating (DFB) laser, and each OLT is arranged side by side leaves the core machine room in.
Be provided with the optical branching device 12 of a plurality of ports, conciliate multiplexing device 11 with said CWDM and be connected, be used for the luminous power on the optical fiber is assigned to each port through optical fiber;
A plurality of optical network units (ONU) 13 are connected with said optical branching device 12 corresponding port optical communications, and ONU adopts with two identical optical wavelength of corresponding OLT and transmits the uplink and downlink data respectively.Can be equipped with corresponding ONU quantity according to corresponding OLT user's needs.For example, suppose that OLT1 need be equipped with two ONU, i.e. ONU1 and ONU1, this moment, the operation wavelength of transmitting terminal of ONU1, ONU2 was identical with the operation wavelength λ 1 of the receiving terminal of corresponding OLT; The operation wavelength of ONU receiving terminal is identical with the operation wavelength λ 1 ' of corresponding OLT transmitting terminal.
Wherein, the mode of the filter plate that the transmitting terminal of each ONU and receiving terminal can be through built-in CWDM the light signal of operation wavelength can be passed through, and the light signal of other inoperative wavelength will be isolated out.ONU can leave in the user building.
The novel hybrid passive optical network that the embodiment of the invention provides adopts ripe thick wavelength-division technology that a plurality of separate EPON systems are superposeed through different CWDM optical wavelength simultaneously and gets in the simple optical fiber.Share among each ONU through optical branching device simultaneously.This topological structure is saved the fiber resource that connects between metropolitan area network and the sub-district greatly, has further brought into play the advantage of EPON simultaneously, can increase number of users neatly, has reduced the cost of every line, has quickened the popularization of EPON network.
Claims (5)
1. hybrid passive optical network system is characterized in that comprising:
A plurality of optical line terminals, each optical line terminal take two different wave lengths of CWDM standard, and two different wave lengths are respectively applied for the transmission of the light signal of optical line terminal transmitting terminal and receiving terminal;
Multiplexing device is conciliate in CWDM, is used for the wavelength optical signals of said a plurality of optical line terminals is transmitted on simple optical fiber;
Be provided with the optical branching device of a plurality of ports, conciliate multiplexing device with said CWDM and be connected, be used for the luminous power on the optical fiber is assigned to each port through optical fiber;
A plurality of optical network units are connected with the optical communication of optical branching device corresponding port, and said optical network unit adopts with two identical optical wavelength of corresponding optical line terminal and transmits the uplink and downlink data respectively; Said optical network unit adopts the Distributed Feedback Laser of CWDM standard, makes whole system be operated in 1400～1600 wave bands.
2. hybrid passive optical network system according to claim 1 is characterized in that: the transmitting terminal of said optical line terminal adopts the distributed feedback bragg grating laser.
3. hybrid passive optical network system according to claim 2 is characterized in that: said optical line terminal is positioned at the core machine room.
4. hybrid passive optical network system according to claim 1 is characterized in that: the transmitting terminal of said optical network unit and receiving terminal are built-in with the filter plate of CWDM.
5. hybrid passive optical network system according to claim 4 is characterized in that: said optical network unit is positioned at the user building.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101722946A CN101197638B (en) | 2007-12-14 | 2007-12-14 | hybrid passive optical network system |
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| CN2007101722946A CN101197638B (en) | 2007-12-14 | 2007-12-14 | hybrid passive optical network system |
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| CN101197638A CN101197638A (en) | 2008-06-11 |
| CN101197638B true CN101197638B (en) | 2012-02-01 |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043216A (en) * | 2010-05-07 | 2011-05-04 | 上海光城邮电通信设备有限公司 | Wave-combining optical branching device |
| CN103338088A (en) * | 2013-06-17 | 2013-10-02 | 太仓市同维电子有限公司 | Optical fiber communication multiplexing device |
| CN103297168A (en) * | 2013-06-19 | 2013-09-11 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| CN103297869A (en) * | 2013-06-19 | 2013-09-11 | 苏州彩云飞电子有限公司 | Downlink transmission method of multi-wavelength passive optical network system |
| CN103297872A (en) * | 2013-06-19 | 2013-09-11 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| CN103297870A (en) * | 2013-06-19 | 2013-09-11 | 苏州彩云飞电子有限公司 | Downlink transmission method of multi-wavelength passive optical network system |
| CN103281611A (en) * | 2013-06-19 | 2013-09-04 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| CN103281609A (en) * | 2013-06-19 | 2013-09-04 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| CN103281610A (en) * | 2013-06-19 | 2013-09-04 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| CN103281612A (en) * | 2013-06-19 | 2013-09-04 | 苏州彩云飞电子有限公司 | Method for downlink transmission of multi-wavelength passive optical network system |
| CN103281627A (en) * | 2013-06-20 | 2013-09-04 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| CN103281637A (en) * | 2013-06-20 | 2013-09-04 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| CN103281630A (en) * | 2013-06-21 | 2013-09-04 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| WO2017070835A1 (en) * | 2015-10-27 | 2017-05-04 | 华为技术有限公司 | Wavelength locking method, network device and wdm pon system |
| CN107765113B (en) * | 2017-09-12 | 2021-01-05 | 江西洪都航空工业集团有限责任公司 | Method for shunting aircraft test signal |
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| CN201150067Y (en) * | 2007-12-14 | 2008-11-12 | 上海未来宽带技术及应用工程研究中心有限公司 | New-style mixed type passive optical network system |
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2007
- 2007-12-14 CN CN2007101722946A patent/CN101197638B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514566A (en) * | 2003-07-04 | 2004-07-21 | 上海全光网络科技股份有限公司 | Same wave length single fiber biairection sparse interleave multiplex transmission system |
| CN101073211A (en) * | 2004-02-06 | 2007-11-14 | Ut斯达康公司 | System and apparatus for a carrier class WDM pon accommodating multiple services or protocols |
| CN1787419A (en) * | 2004-12-07 | 2006-06-14 | 冲电气工业株式会社 | Optical communication network |
| CN201150067Y (en) * | 2007-12-14 | 2008-11-12 | 上海未来宽带技术及应用工程研究中心有限公司 | New-style mixed type passive optical network system |
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Owner name: SHANGHAI FUTURE BROADBAND TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHANGHAI B-STAR BROADBAND TECHNOLOGY + APPLICATION ENGINEERING RESEARCH CENTER CO., LTD. |
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Denomination of invention: Hybrid passive optical network system Effective date of registration: 20220121 Granted publication date: 20120201 Pledgee: Hongkou Branch of Shanghai Rural Commercial Bank Co.,Ltd. Pledgor: SHANGHAI B-STAR TECHNOLOGY CO.,LTD. Registration number: Y2021310000130 |
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Date of cancellation: 20231026 Granted publication date: 20120201 Pledgee: Hongkou Branch of Shanghai Rural Commercial Bank Co.,Ltd. Pledgor: SHANGHAI B-STAR TECHNOLOGY CO.,LTD. Registration number: Y2021310000130 |