CN1889405A - Optical splitter and passive optical network loop system - Google Patents
Optical splitter and passive optical network loop system Download PDFInfo
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- CN1889405A CN1889405A CN 200510080112 CN200510080112A CN1889405A CN 1889405 A CN1889405 A CN 1889405A CN 200510080112 CN200510080112 CN 200510080112 CN 200510080112 A CN200510080112 A CN 200510080112A CN 1889405 A CN1889405 A CN 1889405A
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Abstract
This invention discloses a light-splitting device and a passive optical network ring system, in which, the passive optical network ring system includes a primary and a standby optical circuit terminals independent logically and several optical network units and several light splitting devices with two-way splitting function corresponding to the optical network units one by one, the two optical circuit terminals independent logically and the light splitting devices are connected to a ring net by fibers and connected correspondingly. When the device is used to access said optical network unit into the passive optical network ring system, there is not limit to the port number of the network unit, so it can access more terminal users at the same time.
Description
Technical field
The present invention relates to the networking technology of EPON, relate in particular to a kind of light-dividing device and passive optical network loop system.
Background technology
In the increasing broadband access network of scale, the most existing local area network (LAN) all operates on the network of 100Mbit/s, and many large-scale commercial companies are to the gigabit Ethernet transition.The bandwidth capacity of metro core net and metro edge net is all very abundant at present, and this makes Access Network partly produce serious bandwidth bottleneck.Compare advantage such as Optical Fiber Transmission has that capacity is big, loss is little, anti-electromagnetic interference capability is strong, thereby along with the cost of Optical Fiber Transmission progressively descends, the fiberize of the Access Network development trend that is inevitable with cable transmission.
PON (Passive Optical Network, EPON) be a kind of Passive Optical Components to be inserted into prefect dielectric network in the network, there is not any active device between from the Central Exchange to the local network of users, and on entire path, guide the flow of transmission by the power of separated light wavelength, thereby effectively avoided the influence of electromagnetic interference and thunder and lightning, improved the reliability of communication system external equipment.Passive optical branching device and coupler only play the effect of transmitting and limiting light, do not need power supply and information processing, and have unrestricted mean time between failures (MTBF), can reduce service supplier's maintenance cost comprehensively.Because the growth of terminal use's bandwidth demand and declining to a great extent of optical device price, PON becomes the long-range solution of optical access network gradually.
The networking mode of PON mainly adopts tree topology or ring topology in the prior art.
Figure 1 shows that the structural representation of tree type PON, this PON is by an OLT (Optical Line Terminal who is positioned at service exchange, optical line terminal), several are positioned at ONU (the OpticalNetwork Unit of user resident, optical network unit) and ODN (Optical Distribution Network, optical distribution network) forms, wherein OLT is connected with several ONU by ODN, and ODN is made of devices such as optical fiber, optical branching device or optical couplers.In order to improve the reliability and stability of PON, the optical fibre protection inverting mode that PON adopted of tree topology mainly contains two kinds: a kind of mode is key optical fibre protection inverting, and another kind of mode is a fully protective switching, describes respectively below.
Figure 2 shows that tree type PON adopts the schematic diagram of key optical fibre protection inverting mode.As seen from the figure; adopt the tree type PON of key optical fibre protection inverting mode on the key circuit between OLT and the optical branching device, to adopt backup optical fiber; when breaking down, the optical fiber between OLT and optical branching device can carry out APS; and can't protect, thereby can't adapt to the environment that the protection of PON is had relatively high expectations to the fault of optical fiber between optical branching device and the ONU.
Figure 3 shows that tree type PON adopts the schematic diagram of fully protective switching mode.As seen from the figure, the tree type PON of fully protective switching mode is all redundant from OLT to ONU, has two cover optical branching devices.This full guard mode is actually and adopts one main one to be equipped with the redundancy issue that two cover PON solve each node; auto switching is carried out optical transmission to standby PON when the PON of main usefulness breaks down; adopt all at double the increases of the employed optical fiber of PON of fully protective switching mode and optical branching device, thereby cause the cost increase at double of PON.
The routing policy of ring-like PON is very simple, and the control of Internet resources and management are relatively easy, and is cut off or network node when breaking down at the optical fiber of PON loop, can protect fast and reliable in simple mode.Figure 4 shows that the structural representation of PON loop with APS function; this PON mainly comprises two OLT, several dual-ports ONU and several 2 * 2 optical couplers; can communicate between two OLT; OLT and a plurality of 2 * 2 optical couplers are linked to be ring-type by optical fiber, and 2 * 2 optical couplers pass through the corresponding connection of optical fiber with ONU.Wherein 2 * 2 optical couplers have four ports, and two in two ports of ONU and four ports of 2 * 2 optical couplers are connected respectively.The ONU that inserts on the PON loop by 2 * 2 optical couplers can have two kinds of working methods, and a kind of is that another port of a port working is monitored, and promptly a port working is in any OLT subsystem, and another port is a standby port; Another kind is that two ports are worked in the load sharing mode, and promptly each port working is in an OLT subsystem.The port of each ONU is the interface of corresponding OLT respectively, and each port of ONU can not carry out light with two ports of OLT simultaneously and be connected.
Figure 5 shows that the APS schematic diagram when PON loop generation single-point opens circuit; before optical fiber generation single-point opens circuit; the working method that ONU1-ONU6 adopts port of a port working to monitor; ONU1 wherein; ONU2; ONU3 is operated in the OLT1 subsystem; ONU4; ONU5; ONU6 is operated in the OLT2 subsystem; suppose that the optical fiber trip point occurs between ONU1 and the ONU2; after generation optical fiber single-point opens circuit; ONU1 still works in the OLT1 subsystem; ONU2 will interrupt communicating by letter in the OLT1 subsystem simultaneously with ONU3; because ONU2 and ONU3 have two ports; therefore can utilize standby port to automatically switch to the OLT2 subsystem and continue operation, can finish APS.Must adopt optical coupler in this PON loop and have the ONU of dual-port; otherwise can not carry out APS; and each port of the ONU of dual-port is the interface of corresponding OLT respectively, and each port of ONU can not carry out light with two ports of OLT simultaneously and be connected.Because the ONU inside of dual-port only has two line terminals (LT) module, so its terminal use's that can insert limited amount.
Summary of the invention
The invention provides a kind of light-dividing device and passive optical network loop system, in order to solve the problem that to use the optical network unit of optical coupler and dual-port in the EPON loop that has the APS function in the prior art.
The present invention is by the following technical solutions:
A kind of light-dividing device is used for the EPON loop; Its structure is made of two 1:N+1 type optical branching devices and N 1:2 type optical branching device, a Zhi Luduan of one of them 1:N+1 type optical branching device is connected with a Zhi Luduan of another 1:N+1 type optical branching device, and the residue Zhi Luduan of each 1:N+1 type optical branching device is connected with a Zhi Luduan of each 1:2 type optical branching device respectively.
The trunk end of the trunk end of described N 1:2 type optical branching device and two 1:N+1 type optical branching devices has constituted the N+2 of light-dividing device to external port.
A kind of passive optical network loop system comprises in logic and independently one leading with standby two optical line terminals and several optical network units; Comprise that also several have the light-dividing device of two-way beam split function one to one with optical network unit; Independently two optical line terminals and several light-dividing devices are linked to be ring-type by optical fiber in logic, and light-dividing device passes through the corresponding connection of optical fiber with optical network unit.
Described in logic independently two optical line terminals constitute by the optical line terminal physical equipment that an inside has two line terminator modules, perhaps the optical line terminal that has a line terminator module respectively by two inside constitutes.Described in logic independently two optical line terminals respectively with loop in each optical network unit all of the port with set up light and be connected.
Described optical network unit is inner N port optical network unit with N line terminator module, and the numerical value of N is the integer more than or equal to 1.The described light-dividing device that is connected with N port optical network unit has N+2 port, and wherein N port is used to connect N port optical network unit, and two other port is used for N port optical network unit is inserted the EPON loop.
The light-dividing device of the described N+2 of a having port is made of two 1:N+1 type optical branching devices and N 1:2 type optical branching device, a Zhi Luduan of one of them 1:N+1 type optical branching device is connected with a Zhi Luduan of another 1:N+1 type optical branching device, and the residue Zhi Luduan of each 1:N+1 type optical branching device is connected with a Zhi Luduan of each 1:2 type optical branching device respectively.N the port that is used to connect optical network unit in the described light-dividing device is respectively the trunk end of N 1:2 type optical branching device; Be used for two ports that optical network unit inserts the EPON loop are respectively the trunk end of two 1:N+1 type optical branching devices in the described light-dividing device.
A kind of EPON loop protecting method, described EPON loop comprise that one is main with standby two optical line terminals and several optical network units, set up light respectively with two optical line terminals in the described optical network unit access loop and are connected; Comprise step:
Optical network unit in A, the loop by self working port with main with optical line terminal and carry out optical communication, standby optical line terminal is in holding state;
B, when the optical fiber of EPON loop opens circuit, standby optical line terminal switches to operating state by holding state; Carry out optical communication with main with optical line terminal by the working port continuation of self with the main optical network unit that keeps light to be connected with optical line terminal; The optical network unit that is connected with standby optical network unit maintenance light switches to working port with standby optical network unit and carries out optical communication.
Described optical network unit is that inside has N line terminator module N port optical network unit, and the numerical value of N is the integer more than or equal to 1.
When N equaled 1, the N of a described optical network unit port all was a working port, when the working port of described optical network unit breaks down, and this optical network unit off-line.
When the numerical value of N is during greater than 1 integer, the N of a described optical network unit port all is that working port or part port wherein are working port, and all the other ports are standby port.When the working port of described optical network unit breaks down, the light signal flow that non-working port is born will switch to optical network unit other be in the port of normal condition, port after the switching can be a standby port, also can be the working port that carries out load sharing with the port that breaks down.
The present invention has adopted above technical scheme, has following beneficial effect:
Light-dividing device with two-way beam split function of the present invention is made of two 1:N+1 type optical branching devices and N 1:2 type optical branching device, when using this light-dividing device that optical network unit is inserted passive optical network loop system, to the port number of optical network unit without limits, make the EPON loop can insert more terminal use simultaneously.
Description of drawings
Fig. 1 is the structural representation of tree type PON in the prior art;
Fig. 2 adopts the schematic diagram of key optical fibre protection inverting mode for tree type PON in the prior art;
Fig. 3 is the schematic diagram that tree type PON adopts the fully protective switching mode in the prior art;
Fig. 4 is for having the structural representation of the PON loop of APS function in the prior art;
APS schematic diagram when Fig. 5 opens circuit for PON loop generation single-point in the prior art;
Fig. 6 is a PON cyclic system structural representation of the present invention;
Fig. 7 is the structural representation with light-dividing device of N+2 port of the present invention;
Fig. 8 is the structural representation with light-dividing device of three ports of the present invention;
Fig. 9 is the structural representation with light-dividing device of four ports of the present invention;
Figure 10 A, Figure 10 B are the schematic diagram of PON Fiber In The Loop FITE generation single-point open circuit fault of the present invention;
Figure 11 carries out the flow chart of APS for the port of ONU work at present of the present invention breaks down.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Figure 6 shows that PON cyclic system structural representation of the present invention, its structure mainly by in logic independently two OLT, several ONU, with ONU one to one several at least one optical fiber that have the light-dividing device of two-way beam split function and surround ring-type formed, in this PON cyclic system, independently two OLT are connected to each other in logic, can communicate, OLT and several light-dividing devices connect into ring-type in turn by optical fiber, and light-dividing device passes through the corresponding connection of optical fiber with ONU.Independently two OLT can be the OLT physical equipments that an inside has two line terminator modules in logic, also can be the OLT physical equipments that two inside have a line terminator module respectively.
PON cyclic system of the present invention both can insert the ONU of single port to the port number of the ONU that inserts without limits, also can insert the ONU of multiport.When the access of PON loop had the ONU of N port, the light-dividing device that is connected with this ONU should have N+2 port, and wherein two ports are used for this ONU is inserted the PON loop, and all the other N port is used for being connected one by one with N the port of ONU.
Figure 7 shows that the structural representation of light-dividing device with N+2 port, this light-dividing device can be at least two wavelength windows operate as normal, wherein have at least a wavelength to be used for transmit ascending data, have at least a wavelength to be used for transmitting downlink data.As seen from the figure, this light-dividing device is made of two 1:N+1 type optical branching devices and N 1:2 type optical branching device, a Zhi Luduan of one of them 1:N+1 type optical branching device is connected with a Zhi Luduan of another 1:N+1 type optical branching device, and the residue Zhi Luduan of each 1:N+1 type optical branching device is connected with a Zhi Luduan of each 1:2 type optical branching device respectively.In the N+2 of this light-dividing device port, be used for ONU is inserted two port P of PON loop
1And P
2Be respectively the trunk end of two 1:N+1 type optical branching devices, be used to connect N the port P of ONU
3-P
N+2Be respectively the trunk end of N 1:2 type optical branching device.On 1:N+1 type optical branching device, can set its terminal output light signal splitting ratio, work as P
1When port receives the downlink optical signal that is sent by OLT, P
2-P
N+2Port is according to the ratio output light signal of setting; Work as P
2When port receives the downlink optical signal that is sent by OLT, P
1Port and P
3-P
N+2Port generally speaking, should be provided with identical splitting ratio according to the ratio output light signal of setting on two 1:N+1 type optical branching devices.And work as P
3-P
N+2In arbitrary port when receiving the uplink optical signal that sends by ONU, P
1Port and P
2Port is respectively exported 50% light signal.
Often use the ONU of single port or the ONU of dual-port in the actual networking, the light-dividing device that is used to connect single port ONU should have three ports, the light-dividing device that is used to connect dual-port ONU should have four ports, respectively the structure of the light-dividing device of the light-dividing device of three ports and four ports is described below.
As shown in Figure 8, the light-dividing device of three ports is made of three 1:2 type optical branching devices, the trunk end of three 1:2 type optical branching devices is respectively three ports of light-dividing device, these three port derelictions branch that takes second place, can receive and dispatch light signal, any one port wherein can be connected with the port of the ONU of single port, and two other port inserts in the PON loop.
As shown in Figure 9, the light-dividing device of four ports is made of two 1:2 type optical branching devices and two 1:3 type optical branching devices, the trunk end of two 1:3 optical branching devices is two ports that are used to insert the PON loop of the two-way light-dividing device of 1:3 type respectively, and the trunk end of two 1:2 optical branching devices is respectively two ports being connected respectively with two ports of the ONU of dual-port of being used for of the two-way light-dividing device of 1:3 type.These four ports can be received and dispatched light signal.
When the PON loop is working properly, for two OLT independently in logic, have only an OLT job, another OLT is in standby holding state.As shown in Figure 6, in this PON loop, independently two OLT are OLT physical equipments that an inside has two line terminator modules in logic, and a line terminator module of this OLT physical equipment is in running order, and another line terminator module is in standby holding state.Wherein the ONU1 of single port inserts in the PON loop by the light-dividing device of three ports, the ONU2 of dual-port and ONU3 insert in the PON loop by the light-dividing device of one four port respectively, and the ONU4 of three ports inserts in the PON loop by the light-dividing device of a five-port.For ONU with a plurality of ports, as the ONU2 among the figure, ONU3 and ONU4, a plurality of line terminator modules of each ONU inside can have two kinds of working methods: a kind ofly be in the load sharing working method for a plurality of line terminator modules, promptly all line terminator modules of ONU inside all will be worked; Part in a plurality of line terminator modules of another kind is in running order, and another part is in stand-by state, and the quantity that is in the module of stand-by state generally speaking should be less than or equal to the quantity of in running order module.
When PON loop shown in Figure 6 was in normal operating conditions, the LT1 among the OLT was in running order, and LT2 is in standby holding state, and the flow direction of the downlink optical signal that OLT sends is a clockwise direction, and LT1 among the ONU2 and LT2 carry out load sharing work; LT1 work among the ONU3, LT2 is standby; LT1 among the ONU4 and LT2 work, LT3 is standby.This moment, shown in Figure 10 A, then LT2 automatically switched to operating state by standby holding state as if the current key optical fiber generation single-point open circuit fault that is using of PON loop, and the flow direction of the downlink optical signal that OLT sends is transferred to counterclockwise by clockwise direction.If the user side optical fiber generation single-point open circuit fault of PON loop, shown in Figure 10 B, any one line terminator module of OLT inside sent light signal and all can not arrive whole ONU on the PON loop this moment, in this case, the LT1 and the LT2 of OLT inside work simultaneously, ONU1, ONU2 and ONU3 receive the light signal that LT1 sends, and ONU4 and ONU5 receive the light signal that is sent by LT2, constitute two independently tree type PON networks respectively.
In PON loop of the present invention, fault has taken place if independently carrying out the OLT of work in logic among two independent O LT, then standby OLT transfers operating state automatically to, luminous signal under the ONU in the PON loop.
As shown in figure 11; when the port of ONU work at present breaks down; failure cause has two kinds; fault has taken place in the inner current line terminator module of working of a kind of ONU of being; another kind is that current port of working and the optical fiber between the light-dividing device have taken place to open circuit among the ONU; in this case, the PON loop of the present invention process of carrying out APS is as follows:
Step S10, ONU are when operate as normal, and whether the state of the current port of working of real-time judge is normal, if fault has taken place current port of working, then change step S11 over to, otherwise ONU continue operate as normal;
Step S11, judge whether ONU is the ONU of single port, if, ONU off-line then, otherwise change step S12 over to;
Step S12, the light signal flow that the port that breaks down among the ONU is born switch to other ports that do not open circuit, and other ports that do not open circuit can be standby ports, also can be the ports that carries out load sharing with the port that breaks down.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (15)
1, a kind of light-dividing device is used for the EPON loop; It is characterized in that, its structure is made of two 1:N+1 type optical branching devices and N 1:2 type optical branching device, a Zhi Luduan of one of them 1:N+1 type optical branching device is connected with a Zhi Luduan of another 1:N+1 type optical branching device, and the residue Zhi Luduan of each 1:N+1 type optical branching device is connected with a Zhi Luduan of each 1:2 type optical branching device respectively.
2, light-dividing device according to claim 1 is characterized in that, N+2 of the trunk end formation light-dividing device of the trunk end of described N 1:2 type optical branching device and two 1:N+1 type optical branching devices to external port.
3, a kind of passive optical network loop system comprises in logic and independently one leading with standby two optical line terminals and several optical network units; It is characterized in that, comprise that also several have the light-dividing device of two-way beam split function one to one with optical network unit; Independently two optical line terminals and several light-dividing devices are linked to be ring-type by optical fiber in logic, and light-dividing device is by optical fiber and corresponding optical network unit connection.
4, passive optical network loop system according to claim 3, it is characterized in that, described in logic independently two optical line terminals constitute by the optical line terminal physical equipment that an inside has two line terminator modules, perhaps the optical line terminal that has a line terminator module respectively by two inside constitutes.
5, passive optical network loop system according to claim 3 is characterized in that, described in logic independently two optical line terminals respectively with loop in each optical network unit all of the port with set up light and be connected.
6, passive optical network loop system according to claim 3 is characterized in that, described optical network unit is inner N port optical network unit with N line terminator module, and the numerical value of N is the integer more than or equal to 1.
7, passive optical network loop system according to claim 5, it is characterized in that, the described light-dividing device that is connected with N port optical network unit has N+2 port, wherein N port is used to connect N port optical network unit, and two other port is used for N port optical network unit is inserted the EPON loop.
8, passive optical network loop system according to claim 7, it is characterized in that, the light-dividing device of the described N+2 of a having port is made of two 1:N+1 type optical branching devices and N 1:2 type optical branching device, a Zhi Luduan of one of them 1:N+1 type optical branching device is connected with a Zhi Luduan of another 1:N+1 type optical branching device, and the residue Zhi Luduan of each 1:N+1 type optical branching device is connected with a Zhi Luduan of each 1:2 type optical branching device respectively.
9, passive optical network loop system according to claim 8 is characterized in that, N the port that is used to connect optical network unit in the described light-dividing device is respectively the trunk end of N 1:2 type optical branching device; Be used for two ports that optical network unit inserts the EPON loop are respectively the trunk end of two 1:N+1 type optical branching devices in the described light-dividing device.
10, a kind of EPON loop protecting method, described EPON loop comprise that one is main with standby two optical line terminals and several optical network units, set up light respectively with two optical line terminals in the described optical network unit access loop and are connected; It is characterized in that, comprise step:
Optical network unit in A, the loop by self working port with main with optical line terminal and carry out optical communication, standby optical line terminal is in holding state;
B, when the optical fiber of EPON loop opens circuit, standby optical line terminal switches to operating state by holding state; Carry out optical communication with main with optical line terminal by the working port continuation of self with the main optical network unit that keeps light to be connected with optical line terminal; The optical network unit that is connected with standby optical network unit maintenance light switches to working port with standby optical network unit and carries out optical communication.
11, EPON loop protecting method according to claim 10 is characterized in that, described optical network unit is that inside has N line terminator module N port optical network unit, and the numerical value of N is the integer more than or equal to 1.
12, EPON loop protecting method according to claim 11 is characterized in that, when N equaled 1, the N of a described optical network unit port all was a working port.
13, EPON loop protecting method according to claim 12 is characterized in that, when the working port of described optical network unit breaks down, and this optical network unit off-line.
14, EPON loop protecting method according to claim 11; it is characterized in that; when the numerical value of N is during greater than 1 integer, the N of a described optical network unit port all is that working port or part port wherein are working port, and all the other ports are standby port.
15, EPON loop protecting method according to claim 14; it is characterized in that; when the working port of described optical network unit breaks down; the light signal flow that non-working port is born will switch to optical network unit other be in the port of normal condition; port after the switching can be a standby port, also can be the working port that carries out load sharing with the port that breaks down.
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| WO2009076862A1 (en) * | 2007-12-07 | 2009-06-25 | Huawei Technologies Co., Ltd. | A method for primary and backup links protection in passive optical network and a ring-based system |
| CN101707507A (en) * | 2009-10-28 | 2010-05-12 | 北京邮电大学 | Multi-wavelength passive optical network system and protecting method thereof as well as multi-wavelength far-end nodes |
| CN101150367B (en) * | 2007-11-08 | 2010-09-29 | 杭州华三通信技术有限公司 | A backup method and device for passive optical network OLT device |
| CN101013921B (en) * | 2007-01-12 | 2010-10-13 | 东南大学 | Optical path double-in multi-out splitter of plane light wave with redundant channel |
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| CN103414510A (en) * | 2013-08-12 | 2013-11-27 | 浙江宇视科技有限公司 | EPON protection device and method |
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| CN101013921B (en) * | 2007-01-12 | 2010-10-13 | 东南大学 | Optical path double-in multi-out splitter of plane light wave with redundant channel |
| CN101394614B (en) * | 2007-09-18 | 2012-09-05 | 中兴通讯股份有限公司 | Multipoint connection processing method and system for optical fiber |
| CN101150367B (en) * | 2007-11-08 | 2010-09-29 | 杭州华三通信技术有限公司 | A backup method and device for passive optical network OLT device |
| WO2009076862A1 (en) * | 2007-12-07 | 2009-06-25 | Huawei Technologies Co., Ltd. | A method for primary and backup links protection in passive optical network and a ring-based system |
| US8768162B2 (en) | 2007-12-07 | 2014-07-01 | Huawei Technologies Co., Ltd. | PON ring system, and method for realizing primary and backup link protection in PON |
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| CN102511140B (en) * | 2009-09-23 | 2015-01-14 | 空中客车运营简化股份公司 | Multiport passive optical signal sharing device |
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