CN101521613B - Method for designing optical fiber communication network structure, and extensible network structure - Google Patents
Method for designing optical fiber communication network structure, and extensible network structure Download PDFInfo
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Abstract
The invention provides a network method for designing optical fiber network structure, and a structure capable of flexible extension. The method is characterized in that a first-level network structure is taken as a center; by connecting every edge node of the center with a three-port basic network unit with internal intercommunication function, the network structure is extended outwards to realize the multiplication of the number of the network edge nodes and the interconnection-intercommunication among all the edge nodes and to form a second-level network structure; and by analogy, every edge node of a formed i-level network continues to be connected with one basic network having three ports, so that the outward radiation-extension of the network structure and the multiplication of the number of the network edge nodes are realized so as to form an i+1 level network structure till the number of the network edge nodes of a formed M-level network structure meets design requirements. The network structure is characterized in reliability, high flexibility and extensibility, and has the advantages of low complexity, low cost and realization easiness.
Description
Technical field
The present invention relates to optical fiber communication and communication network technology field, but be specifically related to a kind of method for designing of novel optical fiber communication network architecture and the network configuration of flexible expansion thereof.
Background technology
Optical fiber communication has characteristics such as large transmission bandwidth, low transmission loss and anti-electromagnetic interference, so it can be used for effectively supporting the application of high speed internet, high definition digital television and cable television service, digital speech business, long-distance education, digital library, tele-medicine, ecommerce, intelligent transportation, data grids and the extensive distributed science calculating of multi-site, wired home net, industrial automation etc.In addition, because optical fiber also has the advantage of little, the in light weight and electromagnetic-radiation-free of volume, Fibre Optical Communication Technology has important use value with local area network (LAN), aeronautics and space data/address bus and other military data communication network aspect on vehicle-mounted data bus, naval vessel.Topology of networks design is a very important job for the realization of fiber optic communication network, because its flexibility and reliability and complexity aspect network operation and maintenance will have influence on the cost of network and communication performance, use the time.
In general, star structure and loop configuration are two kinds of topological structures that present Networks of Fiber Communications often uses.Loop configuration is meant the shared optical fiber link of all communication nodes, and the network configuration of a loop of the end to end formation of optical fiber link.In the case, each node is connected with its two adjacent nodes respectively with optical fiber by using optical transceiver, so the data-signal that each communication node sent on the net will be along a direction transmission at fiber annular.For star topology, all communication nodes all need to be connected on the Centroid, and each user terminal must carry out information exchange by a star-type coupler that is positioned at Centroid.Therefore, there is not the problem of loss accumulation in this network configuration, and is easy to realize upgrading and dilatation.In actual applications, adopt the optical networking Luoque of common loop configuration to exist the problem of poor reliability, in case because certain communication node on this network breaks down or a certain section optical fiber is damaged, then interrupting will appear in network service.This can't be applicable to that communication reliability is had the very applied environment of high request, for example the local area network (LAN) of aeronautics and space data/address bus, vehicle-mounted data bus, military carrier-borne local area network (LAN), Banking sector and public security system inside or local access network etc.In order to improve the reliability of common ring l network, fiber optic communication network generally all adopts dual-ring network structure or " self-healing cyclization " technology in actual applications.This just needs to use the optical fiber and the connector thereof of light shutter device and greater number, thereby has increased the cost and the complexity of fiber optic network, so this design can't be satisfied at home network, the application requirements on local area network (LAN) and the local access network cheaply.In addition, in view of the reason that structural complexity and volume and weight increase, " self-healing cyclization " technology also is unfavorable at aeronautics and space data/address bus, vehicle-mounted data bus, tank with the application on the data/address bus.On the other hand, adopt the fiber optic network of star structure to compare with ring network, have cost lower, be easy to realize, the advantage that complexity is low and reliability is high of communication node.In addition, passive star-like optical coupler also has the function that the light signal of its input port is distributed to equably whole output ports of star coupler, thereby greatly reduce the requirement to the input optical signal dynamic range of optical receiver, this will help to simplify the design of optical receiver and reduce cost.Therefore, adopt the fiber optic network of star structure to be used to support the application of LAN (Local Area Network), aeronautics and space data/address bus, tank at large with data/address bus or local access network etc.But stellate reticulum need be connected on the Centroid (being star coupler) by the communication node that it is all, could realize the communication between the network-termination device.Therefore, this network exists shortcomings such as relatively poor and position distribution network-termination device of reliability is limited.For example, in case the centralization star coupler of star optical networking (being the Centroid of network) is damaged/smash, then paralysis will appear in the communication of whole network, and this will cause significant problem when using at aspects such as tank, the ship of war, military command car, aircraft, satellite, guided missiles.In addition, in the commercial communication field, the star optical networking generally all requires its communication node, and nearer or its communication node all compares the concentrated area and is distributed in a small range apart from the Centroid of this network, so that connect networking with optical fiber.This just significantly limits the location distribution of each terminal equipment, so the range of application of star fiber optic network also just has been subjected to limitation.For example, be separated by when some terminal use is far away apart from the Centroid of network or between most of terminal use when far away and distributed more widely, its corresponding terminal device just needs to use long separately optical fiber to link to each other one by one with the Centroid of network respectively or from all quarter optical fiber separately is connected respectively to a centralization node of network (it can be positioned in a room or the rack).This will increase the difficulty and the complexity of optical fiber wiring significantly, thereby has reduced flexibility and ductility that network connects.
In view of existing star structure and loop configuration fiber optic network exist aforesaid shortcoming or problem in actual applications, therefore necessaryly design a kind of novel optical fiber communication network structure, to satisfy the desired high reliability of practical application, high flexibility and ductility.Simultaneously, it also should have low-complexity, low cost and the easy advantage that realizes.
Summary of the invention
At the prior art above shortcomings, the purpose of this invention is to provide a kind of according to practical application needs and customer requirements, can use optical fiber will be in each subscriber terminal equipment of diverse location or communication equipment neatly and be connected with each other and form a communication network, can completely or partially realize the function of star topology and have high reliability, simultaneously the novel optical fiber network configuration that can also expand flexibly network configuration.
The object of the present invention is achieved like this: a kind of fiber optic network structure Design method, it is characterized in that, with first order network configuration is the center, by on its each fringe node, connecting three port basic network unit with inner IWF, network configuration is outwards expanded, interconnecting between the multiplication of realization network edge node number and the whole fringe node forms second level network configuration; By that analogy, continue to connect the basic network unit with three ports again on each fringe node of the i level network that has constituted, the multiplication that the outside width of cloth of realization network configuration is penetrated expansion and network edge node number forms i+1 level network configuration; Wherein, i=1,2,3,4 ...., M-1; Till formed M level network configuration has the network edge node number that meets design requirement;
The fringe node number K of M level network configuration satisfies following formula:
K＝2
M-1N (1)
Described first order network configuration is formed by connecting by some passive light coupling units and optical fiber; N is the fringe node number of first order network configuration, and the value of N is 3 or 4;
Three port basic network unit and first order network configuration with inner IWF use optical fiber and passive light coupling unit to realize.
Further characteristics are, described three port basic network unit with intraconnection IWF, and its input and output port can exchange; Be that two of each passive light coupling unit outputs or input port all need to be connected with corresponding output of two other passive light coupling unit that is in its left and right sides or input port respectively by two sections Transmission Fibers; Utilize the 3rd section optical fiber that still untapped separately output of other two passive light coupling units or input port are linked to each other again; When light signal is imported into any one input port of this basic network unit, it at first by a passive light coupling unit be divided into two ways of optical signals and respectively along about two sections Optical Fiber Transmission to two other passive light coupling unit of this basic network unit, thereby realized that light signal is through any one port input and from the propagation function of two other port output.
Described passive light coupling unit is conventional passive optical coupler, or is formed by a pair of passive optical coupler cascade.
Compared to existing technology, the present invention has following beneficial effect:
1, adopts modularization and standardized designs, realize first order network configuration and three port basic network unit fast with inner IWF.Based on first order network configuration,, just can reach the purpose of the multiplication of the outside expansion of network configuration and fringe node number by on its all fringe nodes, connecting one three port basic network unit (seeing shown in Figure 3) respectively separately.Based on this modular stacked method for designing, each only the need by external separately one three port basic network unit on whole fringe nodes of upper level network configuration, expansion can stretch out, constitute the next stage network configuration, thereby realize having the Networks of Fiber Communications of required fringe node number fast, and can guarantee the function that interconnects between all fringe nodes.
2, can be according to the needs of practical application, select the length of the inner Transmission Fibers in each " three port basic network unit " neatly, make the fringe node of the designed fiber optic communication network that goes out easily to be connected to subscriber terminal equipment or the communication equipment that is in diverse location/place, thereby the signal of guaranteeing any one user can transmit through this fiber optic communication network, is imported into then on other all subscriber terminal equipments or communication equipment on the network.And each " three port basic network unit " inner optical fiber and the passive light coupling unit transmission that can both carry bidirectional optical signal, one of them passive light coupling unit that this just means one the three port basic network unit that each user can both be by its fringe node place, position sends to its light signal on the communication network or receives the light signal that comes from other user on this communication network.This shows, with adopt conventional, compare based on the fiber optic communication network of centralization star coupler, the fiber optic communication network that the present invention designs has simple, the convenient and high advantage of optical fiber utilance of optical fiber wiring.
3,, just can guarantee that the designed Networks of Fiber Communications that goes out can support the transmission of multiple wavelength optical signal by using the passive light coupling unit that wavelength is insensitive or wavelength sensitivity is low to realize each " three port basic network unit ".Therefore, the method for designing of the present invention's proposition also can be supported the application of wavelength division multiplexing/dense wave division multipurpose (WDM/DWDM) fiber optic network.
4, the novel optical fiber communication network of designing according to the present invention, not only can guarantee the light signal of Any user terminal equipment or communication equipment, be input to after transmitting through this network in all the other the whole subscriber terminal equipments or communication equipment except this emission user, and can also be according to the requirement realization multipath light signal of some communication protocol that fiber optic network adopted and network management at the parallel transmission on the same network or support data communication between a plurality of subscriber terminal equipments or the communication equipment simultaneously.This will support advanced optical fiber group-net communication The Application of Technology, for example, and WDM/DWDM technology, optics time division multiplexing (OTDM) technology, optics code division multiplexing (OCDM) technology etc.
5, for a fiber optic communication network with M level network configuration, can select the coupling coefficient of relevant " three port basic network unit " inner passive optical coupler or on some specific optical path, introduce suitable optical attenuator by suitable, just can guarantee from the optical power signals of any one fringe node input of M level network configuration, after through this fiber optic communication network transmission, be distributed to all the other whole fringe nodes places of M level network configuration equably, promptly the optical power signals of these fringe node outputs all equates.This moment, the designed fiber optic communication network that goes out was said whole logic functions of the star structure fiber optic network that has just had a standard on stricti jurise.
Description of drawings
Fig. 1 is the schematic diagram based on the novel optical fiber network configuration of the first order network configuration of three ports and three port basic network unit that the present invention proposes;
Fig. 2 is the schematic diagram based on the novel optical fiber network configuration of the first order network configuration of four ports and three port basic network unit that the present invention proposes;
Fig. 3 is three port basic network cellular construction schematic diagrames among Fig. 1 and Fig. 2;
Fig. 4 is the first order fiber optic network structural representation of first kind of execution mode of the present invention;
Fig. 5 is the first order fiber optic network structural representation of second kind of execution mode of the present invention;
Fig. 6 is the optical fiber communication network structure schematic diagram of relevant 6 fringe nodes of the third execution mode of the present invention;
Fig. 7 is the optical fiber communication network structure schematic diagram of relevant 8 fringe nodes of the 4th kind of execution mode of the present invention.
Embodiment
As depicted in figs. 1 and 2, it is fiber optic network structure Design method of the present invention, be to be the center with first order network configuration, by on its each fringe node, connecting three port basic network unit (referring to shown in Figure 3) with inner IWF, reach the purpose of the outside expansion of network configuration, interconnecting between the multiplication of realization network edge node number and the whole fringe node, thus second level network configuration formed.By that analogy, if on each fringe node of the i level network that has constituted, continue to connect a basic network unit again with three ports, the outside width of cloth that just can realize network configuration is penetrated the multiplication of expansion and network edge node number, forms i+1 level network configuration.Wherein, i=1,2,3,4 ...., M-1.Repeat this step, till formed M level network configuration has the network edge node number that meets design requirement.If first order network configuration has N fringe node (for example, N equals 3 or 4), the fringe node number K of M level network configuration just can calculate by following formula so:
K＝2
M-1N (1)
For example, when N equaled 3 and 4 respectively, the fiber optic network construction design method that adopts the present invention to propose can guarantee that the fringe node number K of the 4th grade of network configuration is respectively 24 and 32.
Three port basic network unit and first order network configuration with inner IWF can use optical fiber and passive optical coupler to realize.
Fig. 3 is the design diagram of this three ports basic network unit.It is made up of three passive light coupling units and three sections optical fiber.According to actual needs, a passive light coupling unit can be the passive optical coupler of a routine, also can be to be formed by a pair of passive optical coupler cascade.Therefore, its input and output port can exchange.In order to realize the inside IWF of basic network unit, two outputs of each passive light coupling unit (perhaps input) port all needs to export (perhaps input) port respectively accordingly with two other passive light coupling unit that is in its left and right sides by two sections Transmission Fibers and is connected.And then utilize the 3rd section optical fiber that the still untapped separately output of other two passive light coupling units (perhaps input) port is linked to each other.When light signal is imported into any one input port of this basic network unit, it at first by a passive light coupling unit be divided into two ways of optical signals and respectively along about two sections Optical Fiber Transmission to two other passive light coupling unit of this basic network unit, thereby realized that light signal from the propagation function that two other port is exported, has so just constituted three port basic network unit with intraconnection IWF through any one port input.The similar design method also can be used to realize first order network configuration, and concrete design example will carry out more detailed introduction in an embodiment.
In actual applications, being connected of the tail optical fiber of Transmission Fibers and passive light coupling unit can realize that the permanent fixation formula connects by means of optical fiber splicer, perhaps by using the optical fiber connector to realize that the plug-in between two optical fiber flexibly connects.In addition, every section Transmission Fibers both can be an optical fiber, also can be formed by connecting by several optical fiber (they can have or not have the optical fiber connector).(for example, 0.2dB/km), even therefore the length of monomode fiber changes one kilometer, the conversion of the output optical signal power that it caused also is very little (for example, being about about 5%) because existing monomode fiber has very low loss; And the variation of the caused output light signal strength of the difference of 100 meters fiber lengths is just littler.This is very useful for the design of " three port basic network unit ".Because it allows that the length of three sections Transmission Fibers can be not wait, so can select the length of three sections Transmission Fibers neatly according to the needs of practical application, realization has three port basic network unit of inner IWF, is used to make up the fiber optic communication network of each subscriber terminal equipment of flexible connection or communication equipment.In addition, for particular application (for example, vehicle-mounted/carrier-borne/airborne fiber optic network, satellite/guided missile fiber buss, the industrial automation optical networking, the optical fiber supervisory control systems of used in nuclear power station etc.), the Networks of Fiber Communications of designing according to the present invention also allows to go up in some or all " three port basic network unit " according to actual needs to use special optical fiber and/or passive optical coupler, to reach anti-high/low temperature, resistance to compression, anti-nuclear radiation/purposes such as anti-space irradiation.The technology that the present invention proposes also is included in and adopts on the structural design that various measures realize shock resistances, resistance to wear, three port basic network unit of anti-bending/twisting, oil resistant dirt and anti-chemical contamination etc.
The basic functional principle of the novel optical fiber communication network architecture that the present invention designs is: all subscriber terminal equipment or communication equipment all are connected to a fiber optic communication network with M level network configuration by the fringe node of M level network configuration, as depicted in figs. 1 and 2.When certain subscriber terminal equipment or communication equipment (being called for short A) need be sent to its information every other subscriber terminal equipment on this network or communication equipment, this information sends user at first needs one of them passive light coupling unit of one three port basic network unit by its fringe node place, position that the light signal that it will send is divided into two-way, then respectively along about two sections Optical Fiber Transmission to two other passive light coupling unit of same basic network unit.Can connect two subscriber terminal equipments or communication equipment (being A and B) respectively owing to be positioned at each three port basic network unit at fringe node place, so equipment B can receive the light signal that comes from device A by another passive light coupling unit that is attached thereto.Simultaneously, the light signal that this remaining that passive light coupling unit in three ports basic network unit is used for that then device A is sent be input to link to each other with this passive light coupling unit but be positioned at M-1 level network configuration place one three port basic network unit (for ease of the narration, abbreviate basic network unit Ω as).When the light signal of device A transmission has arrived this three ports basic network unit that is positioned at M-1 level network configuration place, it still is divided into two ways of optical signals, then respectively along about two sections Optical Fiber Transmission to two other passive light coupling unit of basic network unit Ω.Because these two passive light coupling units are upwards to link to each other with M-2 level network configuration and link to each other with M level network configuration downwards respectively, therefore the light signal that comes from device A just can be transferred to the another one three port basic network unit that are attached thereto, be positioned at M level network configuration place by this passive light coupling unit of downward connection, through its inner transmission along separate routes, the light signal that will come from device A at last is input to two other subscriber terminal equipment or the communication equipment (being called for short C and D) that is positioned at the network edge node place again.So far, the light signal that sends of device A has been input to B, C and D in totally three equipment.Simultaneously, after transmitting along separate routes through the inside of the basic network unit Ω at M-1 level network configuration place, the light signal that comes from device A arrived that passive light coupling unit that upwards connects, again by be attached thereto but be positioned at one the three port basic network unit (abbreviating basic network unit Γ as) at M-2 level network configuration place, just can realize the light signal that device A is exported is fed to M-2 level network configuration.Based on identical principle, be positioned at that the basic network unit Γ at M-2 level network configuration place will receive from the light signal of device A through inner transmission along separate routes after, upwards be transported to M-3 level network configuration, so that reach further upwards the purpose of transmission step by step; And to next by link to each other with basic network unit Γ but the signal transmission of broadcast type is realized in one three port basic network unit being positioned at M-1 level network configuration place, the light signal that will come from device A at last is input to other four subscriber terminal equipments or the communication equipment (being called for short E, F, G and H) that is positioned at the network edge node place.At this moment, the light signal that sends of device A can by B to H totally seven equipment receive.By that analogy, the light signal that device A sends also carries out the signal transmission of broadcast type downwards simultaneously in through the process of upwards transmitting step by step, finally be input in increasing subscriber terminal equipment or the communication equipment.When the light signal of device A transmission has arrived the 1st grade of network configuration, it will realize downward broadcast type transmission by remaining the three port basic network unit that links to each other with this grade network configuration, so that further cover before this those three ports basic network unit of also failing to relate in the transmission course step by step, thereby realized the light signal that device A sends is transferred to respectively in the same fiber optic communication network armamentarium that connect, except that device A upwards.Because any one user's light signal can transmit on the designed fiber optic communication network that goes out through these three port basic network unit with IWF, and then be distributed on other all subscriber terminal equipments or communication equipment of this communication network, so this has just had the main topology feature of a star network.
Below will be respectively at first order network configuration with three ports and four ports, and the specific design example of relevant therewith part optical fiber communication network structure is further set forth the present invention.
As shown in Figure 4, by the optical fiber communication network structure of first kind of execution mode of the inventive method design, by a first order network configuration with three ports can with three routines, coupling coefficient is that the 2X2 passive light directional coupler of 50:50 is formed by connecting with three sections optical fiber respectively.When the input port of light signal by any one optical directional coupler (be called for short A) enters into this first order network configuration, it at first is divided into two by A, become the output light signal that two-way equates and be input to respectively about transmit in two sections optical fiber, arrive the input port of all the other two optical directional couplers (being called for short B and C) of this network configuration then respectively.Respectively its input optical signal separately is divided into two through B and C again, so from the light signal of coupler A input after by the transmission of first order network configuration, just can be distributed to the output port of coupler B and C equably.Because the remaining separately port of input of B and C also is connected by one section optical fiber, therefore this has just realized light signal through any one fringe node input and from the propagation function of two other fringe node output, thereby has constituted a first order network configuration that has the interconnection and interflow function, has 3 fringe nodes.
As shown in Figure 5, press a kind of optical fiber communication network structure of second kind of execution mode of the inventive method design, can be formed by connecting with six sections optical fiber respectively by the 2X3 passive light directional coupler (coupling coefficient of its three output/input ports is 33.33:33.33:33.33, and the coupling coefficient of two I/O ports then is 50:50) of four standards by a first order network configuration with four ports.When the input port of light signal by any one optical directional coupler (be called for short A) enters into this first order network configuration, it at first is divided into three by A one, become three tunnel output light signals that equate and be input to respectively in the three sections optical fiber in left, center, right and transmit, arrive the input port of its excess-three optical directional coupler (abbreviating B, C and D as) of this network configuration then respectively.Respectively its input optical signal separately is divided into two through B, C and D again, so from the light signal of coupler A input after by the transmission of first order network configuration, just can be distributed to the output port of coupler B, C and D equably.Because B, C also are connected by two sections optical fiber respectively with remaining separately two input ports of D, therefore this has just realized light signal through any one fringe node input and from the propagation function of other three fringe nodes output, thereby has constituted a first order network configuration that has the interconnection and interflow function, has 4 fringe nodes.
As shown in Figure 6, by the optical fiber communication network structure of the third execution mode of the inventive method design, can be formed by connecting with three " three port basic network unit " respectively with a first order network configuration with three ports by an optical fiber communication network structure that has 2 grades of network configurations, has 6 fringe nodes.The 2X2 passive light directional coupler that the shared coupling coefficient of one of them port that it should be noted that each fringe node of first order network configuration herein and each three port basic network unit is 50:50.In addition, all the other two ports of each three port basic network unit need use the 1X2 passive optical coupler of two coupling coefficients as 33.33:66.67 respectively.According to three port basic network unit recited above and operation principle with first order network configuration of three ports, the optical fiber communication network structure that designed of going out has 2 grades of network configurations, have 6 fringe nodes can be guaranteed light signal through any one fringe node input of second level network configuration and evenly export from other five fringe nodes of this grade network configuration, and promptly the optical power signals of these fringe nodes outputs all equates.The optical fiber communication network structure of realizing according to this method for designing has just had whole logic functions of a star structure fiber optic network.
As shown in Figure 7, by the optical fiber communication network structure of the 4th kind of execution mode of the inventive method design, can be formed by connecting with four " three port basic network unit " respectively with a first order network configuration with four ports by an optical fiber communication network structure that has 2 grades of network configurations, has 8 fringe nodes.Herein, the 2X3 passive light directional coupler of the shared standard of one of them port of each fringe node of first order network configuration and each three port basic network unit.In order to ensure the output of constant power light signal, the coupling coefficient that is positioned at every 1X2 optical coupler at network configuration fringe node place, the second level should be chosen as 29:71.According to three port basic network unit recited above with have the operation principle of the first order network configuration of four ports, the optical fiber communication network structure that designed of going out has 2 grades of network configurations, have 8 fringe nodes can guarantee that light signal is through any one fringe node input of second level network configuration and evenly export from other seven fringe nodes of this grade network configuration.Therefore, the designed optical fiber communication network structure that goes out has just had whole logic functions of a star structure fiber optic network.
Though above specific design example mainly carries out at the 2X3 passive light directional coupler that adopts present commercialization, conventional 2X2 passive light directional coupler, 1X2 passive optical coupler and standard, the method for designing that the present invention proposes also is applicable to and adopts integrated optics technique or integrated 2X2 passive light directional coupler, 1X2 passive light directional coupler and the 2X3 passive light directional coupler of optics to realize the designed optical fiber communication network structure that goes out.
In the present invention, described fringe node is meant: (1) for M level network configuration, its fringe node is a fiber optic network port/interface that is used for connecting terminal equipment and/or communication equipment.(2) if on i level network configuration (i=1,2,3, ..., M-1), its fringe node then is a fiber optic network port/interface that is used for connecting this grade network configuration and next stage network configuration, promptly is used to connect each " the three port basic network unit " between i level network configuration and the i+1 level network configuration and is positioned at a fiber optic network port/interface of i level network configuration.
Fiber optic network structure of the present invention, employing be the multi-stage fiber network configuration of extension expansion arbitrarily, is connected each terminal equipment and/or communication equipment by optical fiber effectively with passive optical coupler, realizes network service.In actual applications, these terminal equipments and communication equipment both can have been concentrated to be positioned over a place, also can be distributed in different position/places.
Claims (2)
1. fiber optic network structure Design method, it is characterized in that, with first order network configuration is the center, by on its each fringe node, connecting three port basic network unit with inner IWF, network configuration is outwards expanded, interconnecting between the multiplication of realization network edge node number and the whole fringe node forms second level network configuration; By that analogy, on each fringe node of the i level network that has constituted, continue to connect a basic network unit again, realize the multiplication to external radiation expansion and network edge node number of network configuration, form i+1 level network configuration with three ports; Wherein, i=1,2,3,4 ...., M-1; Till formed M level network configuration has the network edge node number that meets design requirement;
The fringe node number K of M level network configuration satisfies following formula:
K＝2
M-1N (1)
Described first order network configuration is formed by connecting by some passive light coupling units and optical fiber; N is the fringe node number of first order network configuration, and the value of N is 3 or 4;
Three port basic network unit and first order network configuration with inner IWF use optical fiber and passive light coupling unit to realize;
Described fringe node is meant: (1) for M level network configuration, its fringe node is a fiber optic network port/interface that is used for connecting terminal equipment and/or communication equipment; (2) if on i level network configuration, i=1,2,3, ..., M-1, its fringe node then is a fiber optic network port/interface that is used for connecting this grade network configuration and next stage network configuration, promptly is used to connect each the three port basic network unit between i level network configuration and the i+1 level network configuration and is positioned at a fiber optic network port/interface of i level network configuration.
2. extendible fiber optic network structure according to claim 1 is characterized in that, described passive light coupling unit is conventional passive optical coupler, or is formed by a pair of passive optical coupler cascade.
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| WO2014091507A1 (en) * | 2012-12-13 | 2014-06-19 | Fincantieri S.P.A. | "ship, in particular cruise ship, with integrated communication network on board" |
| CN105824083B (en) * | 2013-09-13 | 2017-12-22 | 华为技术有限公司 | For in fiber optic cable networks to fibre method, apparatus and fiber optic cable networks |
| CN104954217A (en) * | 2015-05-05 | 2015-09-30 | 电子科技大学 | Multi-NC (network controller) star topological structure on basis of FC-AE-1553 (fiber channel-avionics environment-1553) protocols |
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| CN1414710A (en) * | 2001-10-22 | 2003-04-30 | 上海贝尔有限公司 | Distribution type large sacle star coupler used in photo network system |
| CN1514605A (en) * | 2003-03-27 | 2004-07-21 | 中国科学院计算机网络信息中心 | Hierarchical exchange network system |
| CN1545238A (en) * | 2003-11-13 | 2004-11-10 | 上海交通大学 | Eight-channel full fiber coarse wavelength-division multiplexer/demultiplexer |
| CN1791011A (en) * | 2005-12-06 | 2006-06-21 | 电子科技大学 | Network topology automatic forming method in network management system |
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2008
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414710A (en) * | 2001-10-22 | 2003-04-30 | 上海贝尔有限公司 | Distribution type large sacle star coupler used in photo network system |
| CN1514605A (en) * | 2003-03-27 | 2004-07-21 | 中国科学院计算机网络信息中心 | Hierarchical exchange network system |
| CN1545238A (en) * | 2003-11-13 | 2004-11-10 | 上海交通大学 | Eight-channel full fiber coarse wavelength-division multiplexer/demultiplexer |
| CN1791011A (en) * | 2005-12-06 | 2006-06-21 | 电子科技大学 | Network topology automatic forming method in network management system |
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