CN104660475B - Asymmetric passive fiber train bus-line topological structure and each terminal interconnected method - Google Patents
Asymmetric passive fiber train bus-line topological structure and each terminal interconnected method Download PDFInfo
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Abstract
A kind of asymmetric passive fiber train bus-line topological structure, includes a fiber buss, and the fiber buss includes optical cable and multiple passive fiber difference units in Passive Optical Components；The passive fiber difference unit includes three ports and the three end branch road multiplexing couplers for the optical signal of three ports to be carried out to branch/combining；Three end branch road multiplexing coupler includes asymmetrical multiplexing coupling glass knot；Glass knot is coupled by the asymmetrical multiplexing, first port connects with second port, forms the first smooth branch road, is connected for fiber link；First port connects with the 3rd port, forms the second smooth branch road；Second port connects with the 3rd port, forms the 3rd smooth branch road.The high speed interconnection between train apparatus is not only have effectively achieved, and the quantity that connects of terminal is significantly increased, while it is easily installed and possesses good electromagnetism interference and be dielectrically separated from performance.
Description
Technical field
The present invention relates to a kind of line topological areas of information technology of track traffic, more particularly to a kind of asymmetric passive light
Fine train bus-line topological structure and each terminal interconnected method.
Background technology
Urban track traffic is to belong to the complication system for integrating multi-specialized, more work posts, have freight volume is big, speed is fast,
Safety, on schedule, environmental protection, save the energy and the features such as land used.Countries in the world it is well recognized that：Solve the traffic problems in city
Fundamental solution be to first develop urban public tranlport system using track traffic as backbone.
To ensure in driving conditions, each system operation is normal, including running interval, driving route and traffic safety, row
The communication system of car is then particularly important.
At present, train network mainly uses the bus-type topology network architecture based on twisted pair physical media, using more work(
Can vehicle bus (Multifunction Vehicle Bus, abbreviation：MVB), controller LAN (Controller Area
Network, referred to as：The vehicle bus standard such as CAN).MVB network speed can reach 2Mb/s in 1.5Mb/s, CAN highests.
But have become train network skill for the demand of modern train equipment and technology development, network transfer speeds
The bottleneck of art development.
In order to adapt to train network technology growth requirement, train express network is realized, Some Enterprises start to apply based on double
The ethernet technology of twisted wire and the fiber optic Ethernet of Star topology develop the highspeed network applications on train.
But it is while train high speed network transmission is realized, because medium is based on plain conductors such as twisted-pair feeders
Technology is, it is necessary to do complicated electromagnetic protection measure to meet EMC Requirements, especially when with high-tension circuit case cabinet altogether altogether
Also to take into full account the measure such as insulation protection and crosstalk protection.
And the fiber optic Ethernet technology experimentally applied is due to the limitation of its topological mode, wherein, passive optical-fiber network
(Passive Optical Network, referred to as:PON) light net forms false bus-type topology, when realizing interconnection, it is still desirable to
One center switch is set, and the information for terminal room exchanges, it is impossible to realize the signal broadcast on medium, in link exchange also
It is to belong to star structure, it is necessary to expend substantial amounts of cable, causes the problems such as wiring is complicated, the workload of equipment installation maintenance is big.
And central node burden weight, is formed " bottleneck ", once breaking down, then the whole network is impacted.
The content of the invention
The purpose of the present invention, it is exactly overcome the deficiencies in the prior art, there is provided a kind of asymmetric passive fiber train bus-line is opened up
Structure is flutterred, the train bus-line topological structure not only have effectively achieved the high speed interconnection between train apparatus, and end is significantly increased
End connects quantity, while it is easily installed and possesses good electromagnetism interference and be dielectrically separated from performance.
In order to achieve the above object, adopt the following technical scheme that：
A kind of asymmetric passive fiber train bus-line topological structure, include a fiber buss, the fiber buss bag
Include the optical cable in Passive Optical Components and multiple passive fiber difference units.
The passive fiber difference unit includes three ports and for the optical signal of three ports to be carried out into branch/conjunction
The three end branch road multiplexing couplers on road；Three end branch road multiplexing coupler includes asymmetrical multiplexing coupling glass knot；Pass through
The asymmetrical multiplexing couples glass knot, and first port connects with second port, forms the first smooth branch road, connects for fiber link
Connect；First port connects with the 3rd port, forms the second smooth branch road；Second port connects with the 3rd port, forms the 3rd smooth discrimination
Road.Wherein, the maximum splitting ratio in the first smooth branch road and the second smooth branch road is 32:1；First smooth branch road and the maximum in the 3rd smooth branch road
Splitting ratio is 32:1；The splitting ratio in the second smooth branch road and the 3rd smooth branch road is 1:1.
As a kind of specific embodiment, the branch ratio in the first smooth branch road and the second smooth branch road is 19：1；Described
The branch ratio in one smooth branch road and the 3rd smooth branch road is 19：1.
Further, a kind of asymmetric passive fiber train bus-line topological structure, also includes multiple network terminals, and
The high speed fibre transceiver being connected between the network terminal and the 3rd port.
Further, it is connected with optical transceiver connector at the 3rd port.
Further, the joints of optical fibre are respectively connected with the first port and second port.
Further, the joints of optical fibre include fibre-optical splice and ceramic contact pin.
Each terminal interconnected method in a kind of asymmetric passive fiber train bus-line topological structure, this method include：
When topological terminal device of the optical signal from first port：
Optical signal is passed to passive fiber difference unit by the joints of optical fibre of first port；Passive fiber difference unit leads to
Asymmetrical multiplexing coupling glass knot is crossed, most of optical signal is oriented to the first smooth branch road, continues by second port to bus and passes
It is defeated；Fraction optical signal is oriented to the second smooth branch road, it is through the optical transceiver connector at the 3rd port that optical signal is incoming at a high speed
Fiber optical transceiver, the high speed fibre transceiver convert optical signals into electric signal, the equipment for being sent to the 3rd port topology.
When topological terminal device of the optical signal from second port：
Optical signal is passed to passive fiber difference unit by the joints of optical fibre of second port；Passive fiber difference unit leads to
Asymmetrical multiplexing coupling glass knot is crossed, most of optical signal is oriented to the first smooth branch road, continues by first port to bus and passes
It is defeated；Fraction optical signal is oriented to the second smooth branch road, it is through the optical transceiver connector at the 3rd port that optical signal is incoming at a high speed
Fiber optical transceiver, the high speed fibre transceiver convert optical signals into electric signal, the equipment for being sent to the 3rd port topology.
When topological terminal device of the optical signal from the 3rd port：
Electric signal is passed to high speed fibre transceiver by the topological terminal positioned at the 3rd port, and the high speed fibre transceiver will
Electric signal is converted into optical signal, and optical signal is passed into passive fiber difference unit through the optical transceiver connector at the 3rd port；
Optical signal is divided into two identical optical signals by the asymmetrical multiplexing coupling glass knot, is individually directed the second smooth branch road and the 3rd
Light branch road；Then continue respectively by the joints of optical fibre at first port, second port to bus and transmit.
Further, optical path signal data are modulated/demodulated by the way of time division multiple acess.
Compared with prior art, the beneficial effects of the present invention are：
(1) the asymmetric light splitting function of optical fiber backbone light path is realized by three end branch road multiplexing couplers, is overcome existing
There is 1 point of 2 light splitting technology to realize the problem of a small amount of terminal is expanded when causing main optical path (the first smooth branch road) bus-type topology,
The optical signal rational and efficient use of backbone optical path can be made, terminal is significantly increased connects quantity.
(2) bus type topological structure of light net truly is realized, solves and is opened up on original train using star
Flutter or annular midsequent topology has the problem of optical cable dosage is big, and trunking is more and reliability weak spot is more.
(3) coupling glass knot is multiplexed by asymmetric three end difference, light web frame is realized the direct of each terminal
Broadcast type is sent, and is avoided existing PON and be must be set up the switching centre that center switch is sent as data, so as to simplify net
Network equipment, and equipment transmission time delay process and repeated bandwidth occupancy are reduced, improve efficiency of transmission and bandwidth availability ratio.
Brief description of the drawings
Fig. 1 is the principle schematic diagram of the asymmetric passive fiber train bus-line topological structure of the present invention.
Fig. 2 is the principle schematic diagram of passive fiber difference unit of the present invention.
Fig. 3 is the principle schematic of topological terminal device of the optical signal from first port.
Fig. 4 is the principle schematic of topological terminal device of the optical signal from second port.
Fig. 5 is the principle schematic of topological terminal device of the optical signal from the 3rd port.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific implementation method, the present invention schematic implementation and
Illustrate for explaining the present invention, but it is not as a limitation of the invention.
As shown in Figure 1, 2, a kind of fiber optic network bus topolopy of the present invention, includes：One fiber buss, the light
Fine bus includes optical cable 1 and multiple passive fiber difference units 2 in Passive Optical Components.Also include multiple network terminals, Fig. 1
In only depict 4 each terminals.And it is connected to the high speed fibre transceiver between the network terminal and the 3rd port 23.
The passive fiber difference unit 2 include three ports and for by the optical signal of three ports carry out branch/
Three end branch road multiplexing couplers 24 of combining；Three end branch road multiplexing coupler includes asymmetrical multiplexing coupling glass knot；
Wherein, the asymmetrical multiplexing coupling glass knot, by fused biconical taper technology, each self-forming 1*2 point at three ends of glass knot
Light cone, by multi-model fusion drawn to suitable splitting ratio, wherein maximum can be pulled to 32:1, it can at most realize 1*8 roads point
Light；Glass knot is coupled by the asymmetrical multiplexing, first port 21 connects with second port 22, forms the first smooth branch road, uses
In fiber link connection, namely trunk roads, i.e. total line.First port 21 connects with the 3rd port 23, forms the second smooth branch road
242；Second port 22 connects with the 3rd port 23, forms the 3rd smooth branch road 243.
Wherein, optical signal is divided into two parts asymmetric optical signal by asymmetrical multiplexing of the invention coupling glass knot, respectively
It is oriented to the first smooth smooth 242 or the 3rd smooth branch road 243 of branch road in branch road 241 and second.
Preferably, the branch ratio in the described first smooth 241 and second smooth branch road 242 of branch road can be 19：1；First light
The branch ratio in 241 and the 3rd smooth branch road 243 of branch road can be 19：1；Point in second smooth 242 and the 3rd smooth branch road 243 of branch road
Road ratio is 1：1.
It should be noted that the branch ratio between the different branch roads of the present invention is not restricted to 32:1,19:1 or 1:1, according to
Actual use demand, carry out the light splitting of different proportion.
Wherein, the optical transceiver connector 26 for being used for being connected with high speed fibre transceiver is provided with the 3rd port 23.
At first port 21 and second port 22, by the joints of optical fibre 25, by passive fiber difference unit 2 and the optical cable at both ends
1 is attached, and is transmitted with ensureing that optical signal continues to bus.
Wherein, the joints of optical fibre 25 include fibre-optical splice and ceramic contact pin (not shown).
The present invention, will by three end difference multiplexing coupling glass knots in the passive fiber difference unit 2 on fiber buss
Optical signal is divided into asymmetric two parts；Realize the interconnection between each topological terminal, and between each terminal optical signal it is direct
Broadcast type is sent, and is avoided existing PON and be must be set up the switching centre that center switch is sent as data, so as to simplify net
Network equipment, and equipment transmission time delay process and repeated bandwidth occupancy are reduced, improve efficiency of transmission and bandwidth availability ratio.
Specifically, the interconnected method between each terminal, illustrated with a passive fiber difference unit, such as the institute of Fig. 3,4,5
Show, light signal energy size is represented with arrow size in figure.
Using the branch ratio in the first smooth 241 and second smooth branch road 242 of branch road as 19：1；The first smooth branch road 241 and the 3rd
The branch ratio in light branch road 243 is 19：1；The branch ratio in second smooth 242 and the 3rd smooth branch road 243 of branch road is 1：1 illustrates
It is bright：
As shown in figure 3, when topological terminal device of the optical signal from first port：
Optical signal, now light signal strength is represented with big arrow at first port, passes through the joints of optical fibre of first port
Incoming passive fiber difference unit；Passive fiber difference unit couples glass knot by asymmetrical multiplexing, by 95% optical signal,
Represented with middle arrow, be oriented to the first smooth branch road, continued by second port to bus and transmit；By 5% optical signal, with small arrow
Represent, be oriented to the second smooth branch road, through the optical transceiver connector at the 3rd port by optical signal, now or small arrow represents.
Incoming high speed fibre transceiver, the high speed fibre transceiver convert optical signals into electric signal, are sent to the 3rd port topology
Equipment.
As shown in figure 4, when topological terminal device of the optical signal from second port：
Optical signal is passed to passive fiber difference unit by the joints of optical fibre of second port；Passive fiber difference unit leads to
Asymmetrical multiplexing coupling glass knot is crossed, 95% optical signal is oriented to the first smooth branch road, continues by first port to bus and passes
It is defeated；5% optical signal is oriented to the second smooth branch road, optical signal is passed to high-speed light through the optical transceiver connector at the 3rd port
Fine transceiver, the high speed fibre transceiver convert optical signals into electric signal, the equipment for being sent to the 3rd port topology.
As shown in figure 5, when topological terminal device of the optical signal from the 3rd port：
Electric signal (big arrow) is passed to high speed fibre transceiver, the high speed fibre by the topological terminal positioned at the 3rd port
Transceiver converts the electrical signal to optical signal, and optical signal is passed into passive fiber point through the optical transceiver connector at the 3rd port
Discrimination unit；Optical signal is divided into two identical optical signals by the asymmetrical multiplexing coupling glass knot, is individually directed the second smooth discrimination
Road and the 3rd smooth branch road, the second smooth branch road are identical with the arrow size in the 3rd smooth branch road；Then respectively by first port, the
The joints of optical fibre at Two-port netwerk continue to bus to be transmitted.
Wherein, the optical path signal data message based on optic path uses TDMA (time division multiple acesses：time division
Multiple access) mode be modulated/demodulate.
The asymmetric light splitting function of optical fiber backbone light path is realized by three end branch road multiplexing couplers, overcomes existing 1
2 light splitting technologies are divided to cause that the problem of a small amount of terminal is expanded can only be realized during main optical path (the first smooth branch road) bus-type topology, can
So that the optical signal rational and efficient use of backbone optical path, terminal is significantly increased connects quantity.In practice, root on fiber buss
There can be multiple topological terminal devices according to needs.The bus type topological structure of light net truly is realized, is solved original
It is big using Star topology or annular midsequent topology to there is optical cable dosage on train, trunking is more and reliability weak spot more than
Problem.
Meanwhile from based on the plain conductors such as twisted-pair feeder with too network technology it is different, the present invention is easily installed and possessed good
Electromagnetism interference and it is dielectrically separated from performance.The electromagnetic protection measure can that complexity need not be done meets EMC Requirements,
When with high-tension circuit case cabinet altogether altogether, it is not required that the problems such as being protected for insulation protection and crosstalk does special consideration.
The technical scheme provided above the embodiment of the present invention is described in detail, specific case used herein
The principle and embodiment of the embodiment of the present invention are set forth, the explanation of above example is only applicable to help and understands this
The principle of inventive embodiments；Meanwhile for those of ordinary skill in the art, according to the embodiment of the present invention, in specific embodiment party
There will be changes in formula and application, in summary, this specification content should not be construed as limiting the invention.
Claims (10)
1. a kind of asymmetric passive fiber train bus-line topological structure, it is characterised in that include：
One fiber buss, the fiber buss include optical cable and multiple passive fiber difference units in Passive Optical Components；
The passive fiber difference unit includes three ports and for the optical signal of three ports to be carried out into branch/combining
Three end branch road multiplexing couplers；
Three end branch road multiplexing coupler includes asymmetrical multiplexing coupling glass knot；
Glass knot is coupled by the asymmetrical multiplexing, first port connects with second port, the first smooth branch road is formed, for light
Fine link connection；First port connects with the 3rd port, forms the second smooth branch road；Second port connects with the 3rd port, is formed
3rd smooth branch road；
Wherein, the maximum splitting ratio in the first smooth branch road and the second smooth branch road is 32:1；
The maximum splitting ratio in the first smooth branch road and the 3rd smooth branch road is 32:1；
The splitting ratio in the second smooth branch road and the 3rd smooth branch road is 1:1.
2. asymmetric passive fiber train bus-line topological structure according to claim 1, it is characterised in that：
The splitting ratio in the first smooth branch road and the second smooth branch road is 19：1；
The splitting ratio in the first smooth branch road and the 3rd smooth branch road is 19：1.
3. asymmetric passive fiber train bus-line topological structure according to claim 1, it is characterised in that：
A kind of asymmetric passive fiber train bus-line topological structure, also includes multiple network terminals, and is connected to network end
High speed fibre transceiver between end and the 3rd port.
4. asymmetric passive fiber train bus-line topological structure according to claim 1, it is characterised in that：
Optical transceiver connector is connected with 3rd port.
5. asymmetric passive fiber train bus-line topological structure according to claim 1, it is characterised in that：
The joints of optical fibre are respectively connected with the first port and second port.
6. asymmetric passive fiber train bus-line topological structure according to claim 5, it is characterised in that：
The joints of optical fibre include fibre-optical splice and ceramic contact pin.
A kind of 7. each terminal interconnected method in asymmetric passive fiber train bus-line topological structure, it is characterised in that this method bag
Include：
When topological terminal device of the optical signal from first port：
Optical signal is passed to passive fiber difference unit by the joints of optical fibre of first port；
Passive fiber difference unit couples glass knot by asymmetrical multiplexing, and most of optical signal is oriented into the first smooth branch road, warp
Cross second port and continue transmission to bus；
Fraction optical signal is oriented to the second smooth branch road, it is through the optical transceiver connector at the 3rd port that optical signal is incoming at a high speed
Fiber optical transceiver, the high speed fibre transceiver convert optical signals into electric signal, the equipment for being sent to the 3rd port topology.
A kind of 8. each terminal interconnected method in asymmetric passive fiber train bus-line topological structure, it is characterised in that this method bag
Include：
When topological terminal device of the optical signal from second port：
Optical signal is passed to passive fiber difference unit by the joints of optical fibre of second port；
Passive fiber difference unit couples glass knot by asymmetrical multiplexing, and most of optical signal is oriented into the first smooth branch road, warp
Cross first port and continue transmission to bus；
Fraction optical signal is oriented to the second smooth branch road, it is through the optical transceiver connector at the 3rd port that optical signal is incoming at a high speed
Fiber optical transceiver, the high speed fibre transceiver convert optical signals into electric signal, the equipment for being sent to the 3rd port topology.
A kind of 9. each terminal interconnected method in asymmetric passive fiber train bus-line topological structure, it is characterised in that this method bag
Include：
When topological terminal device of the optical signal from the 3rd port：
Electric signal is passed to high speed fibre transceiver by the topological terminal positioned at the 3rd port, and the high speed fibre transceiver is by telecommunications
Number optical signal is converted into, optical signal is passed to passive fiber difference unit through the optical transceiver connector at the 3rd port；
Optical signal is divided into two identical optical signals by asymmetrical multiplexing coupling glass knot, is individually directed the second smooth branch road and the 3rd
Light branch road；Then continue respectively by the joints of optical fibre at first port, second port to bus and transmit.
10. each terminal interconnection in the asymmetric passive fiber train bus-line topological structure according to claim any one of 7-9
Method, it is characterised in that：Optical path signal data are modulated/demodulated by the way of time division multiple acess.
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| WO2019153333A1 (en) * | 2018-02-12 | 2019-08-15 | 深圳前海达闼云端智能科技有限公司 | Pon-can bus architecture and robot system |
| CN112468234B (en) * | 2020-12-10 | 2023-02-21 | 中国人民解放军陆军工程大学 | A centerless single-fiber passive optical bus network system using coupler bifurcation |
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