CN104518829B - A kind of optical branching device and annular EPON - Google Patents
A kind of optical branching device and annular EPON Download PDFInfo
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- CN104518829B CN104518829B CN201310454247.6A CN201310454247A CN104518829B CN 104518829 B CN104518829 B CN 104518829B CN 201310454247 A CN201310454247 A CN 201310454247A CN 104518829 B CN104518829 B CN 104518829B
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Abstract
The invention provides a kind of optical branching device and annular EPON.Optical branching device therein includes：First photo-coupler, the second photo-coupler and shell.Annular EPON therein includes：OLT, multiple optical branching devices and multiple ONU；The first OLT ports and the 2nd OLT ports are provided with OLT；Multiple optical branching devices are connected in series by the first port and second port of each optical branching device；OLT the first OLT ports are connected by optical fiber with the first port of first optical branching device, and OLT the 2nd OLT ports are connected by optical fiber with the second port of last optical branching device；Each ONU corresponds respectively to an optical branching device；The first first line of a couplet port and the second first line of a couplet port are provided with each ONU；The 3rd port and the connection of the 4th port of corresponding optical branching device are distinguished in each ONU the first first line of a couplet port and the second first line of a couplet port.Annular EPON can be set up using the present invention, cost is saved, looped network protection is realized, the reliability of network is improved.
Description
Technical field
The application is related to mobile communication technology field, more particularly to a kind of optical branching device and annular EPON.
Background technology
EPON in the prior art（PON）Networking mode be stelliform connection topology configuration.Fig. 1 is of the prior art
PON networking mode schematic diagrames.As shown in figure 1, PON of the prior art mainly includes：Optical line terminal（OLT）11st, Duo Gewu
Source optical splitter（Passive Optical Splitter）12nd, multiple optical network units（ONU）13 and a plurality of optical fiber.One OLT
Multiple ONU can be forwarded to by passive optical splitters, are connected between OLT and optical splitter by optical fiber, optical splitter and each ONU it
Between also by optical fiber be connected, therefore, one can be provided with one or more optical splitters between OLT and ONU.
Because whole PON link need not all power and without special environmental requirement, so can greatly reduce
Equipment failure rate and extra machine room resource is not needed, therefore there is in cost larger advantage.But, due to existing skill
PON in art is stelliform connection topology configuration, therefore the problem of have as described below：
1st, when somewhere fibre break occurs in PON（As shown in Figure 1）, the follow-up ONU after breaking optical fiber will not
It can realize and communicate with OLT, thus be likely to result in the paralysis of large area PON.Carried out if solving the above problems
Link protection, then generally require and lay special slack, therefore realizes that difficulty is big, and cost of implementation is high.
2nd, most important optical device is optical branching device in existing PON（Passive optical splitters i.e. shown in Fig. 1）.But
It is that optical branching device of the prior art is star-like passive device, is typically to be equally distributed to received luminous power
On each connected branch road, so as to be easily caused two problems as described below：
1）Can only be used for setting up Star Network using optical branching device of the prior art, and be difficult to set up loop network or
Wireless mesh network（MESH）；
2）PON Star Networks in actual use, the ONU connected under next OLT of normal conditions PON ports number
Amount is far smaller than the branch road quantity under optical branching device, therefore the characteristic of optical branching device mean allocation luminous power will cause to be not connected with
Waste of the ONU optical splitter port to luminous power.
The content of the invention
In view of this, the invention provides a kind of optical branching device and annular EPON, so as to set up annular nothing
Source optical-fiber network, improves the service efficiency of inputs light beam, improves the reliability of optical-fiber network.
What technical scheme was specifically realized in：
A kind of optical branching device, the optical branching device includes：First photo-coupler, the second photo-coupler and shell；
First port, second port, the 3rd port and the 4th port are provided with the shell；
First photo-coupler is connected with the first port on the shell, the 3rd port respectively；Second optocoupler
Clutch is connected with the second port on the shell, the 4th port respectively；One end of first photo-coupler and described second
One end connection of photo-coupler；
First photo-coupler and the second photo-coupler respectively there is default wavelength to associate splitting ratio；
The light beam that first photo-coupler will be inputted according to its default wavelength association splitting ratio from the first port
The 3rd port and the second photo-coupler are respectively outputted to, and the light beam from the 3rd port and the input of the second photo-coupler is defeated
Go out to the first port；
The light beam that second photo-coupler will be inputted according to its default wavelength association splitting ratio from the second port
The 4th port and the first photo-coupler are respectively outputted to, and the light beam from the 4th port and the input of the first photo-coupler is defeated
Go out to the second port.
Preferably, the wavelength association splitting ratio of first photo-coupler associates splitting ratio with the wavelength of the second photo-coupler
Differ.
Preferably, the wavelength association splitting ratio of first photo-coupler associates splitting ratio with the wavelength of the second photo-coupler
It is identical.
Preferably, when the wavelength of the light beam of input is default first wave length λ 1, the wavelength of first photo-coupler
It is 10 that association splitting ratio, which associates splitting ratio with the wavelength of the second photo-coupler,：90；
Or, when the wavelength of the light beam of input is default second wave length λ 2, the wavelength of first photo-coupler is closed
It is 20 that connection splitting ratio, which associates splitting ratio with the wavelength of the second photo-coupler,：80；
Or, when the wavelength of the light beam of input is default wavelength lambda 3, the wavelength of first photo-coupler is closed
It is 30 that connection splitting ratio, which associates splitting ratio with the wavelength of the second photo-coupler,：70.
Present invention also offers a kind of annular EPON, the annular EPON includes：Optical line terminal OLT,
Multiple optical branching devices as claimed in claim 1 and multiple optical network unit ONUs；
The first OLT ports and the 2nd OLT ports are provided with the OLT；
The multiple optical branching device is connected in series by the first port and second port of each optical branching device；
The first OLT ports of the OLT are connected by optical fiber with the first port of first optical branching device, the OLT's
2nd OLT ports are connected by optical fiber with the second port of last optical branching device, form ring-like network structure；
Each ONU corresponds respectively to an optical branching device；
The first first line of a couplet port and the second first line of a couplet port are provided with each ONU；Each ONU the first first line of a couplet port and
Distinguish the 3rd port and the connection of the 4th port of corresponding optical branching device in two first line of a couplet ports.
Preferably, when the annular EPON normal work, the first OLT ports of the OLT be used to export and
Receive light beam；The 2nd OLT ports of the OLT are used to receive light beam；Each ONU is received or exported by the first first line of a couplet port
Light beam；Beam Propagation is then given the OLT or next optical branchings by each optical branching device by first port and second port
Device, and it is by the 3rd port that beam Propagation is to connected ONU or defeated by the 3rd port connected ONU of reception
The light beam gone out.
Preferably, when there is fibre break failure at one in the annular EPON, at fibre break failure with
Each optical branching device between OLT the 2nd OLT ports is by the 4th port by beam Propagation is to connected ONU or leads to
Cross the light beam that the 4th port receives connected ONU outputs；At fibre break failure between OLT the 2nd OLT ports
Each ONU is received or output beam by the second first line of a couplet port；OLT the 2nd OLT ports are used to exporting and receiving light beam.
Preferably, when the annular EPON normal work, the 2nd OLT ports of the OLT be used to export and
Receive light beam；The first OLT ports of the OLT are used to receive light beam；Each ONU is received or exported by the second first line of a couplet port
Light beam；Beam Propagation is then given the OLT or next optical branchings by each optical branching device by first port and second port
Device, and it is by the 4th port that beam Propagation is to connected ONU or defeated by the 4th port connected ONU of reception
The light beam gone out.
Preferably, when there is fibre break failure at one in the annular EPON, at fibre break failure with
Each optical branching device between OLT the first OLT ports is by the 3rd port by beam Propagation is to connected ONU or leads to
Cross the light beam that the 3rd port receives connected ONU outputs；At fibre break failure between OLT the first OLT ports
Each ONU is received or output beam by the first first line of a couplet port；OLT the first OLT ports are used to exporting and receiving light beam.
As seen from the above technical solution, a kind of new optical branching device with multiple ports, the light are proposed in the present invention
Shunt has multiple ports, and its splitting ratio can dynamically be changed by adjusting the wavelength of inputted light beam, therefore can
To set up corresponding annular EPON using above-mentioned optical branching device.In the annular EPON, due to optical-fiber network
In each optical branching device be not the output of each port of mean allocation luminous power, and simply by the fraction work(of inputs light beam
Rate is transferred on the ONU being connected with optical branching device, and most of power of inputs light beam will be transferred to next by optical branching device
Optical branching device, therefore, even if will not also cause larger waste to luminous power without connection ONU on some optical branching device, so that
The luminous power of inputs light beam can be greatlyd save, the service efficiency of inputs light beam is improved, it is cost-effective.Being additionally, since to lead to
Adjustment is crossed from the wavelength of the OLT light beams exported come the splitting ratio of each optical branching device in dynamically adjusting annular EPON, is fitted
The luminous power on each ONU is assigned to when allotment, it is ensured that light beam there are enough power transmissions to next ONU, so as to
Ensure that greater number of optical branching device and ONU can be connected in annular EPON.In addition, in the annular nothing using the present invention
During the optical-fiber network of source, even if when somewhere fibre break occurs in annular EPON, the follow-up ONU after breaking optical fiber is still
It can realize and communicate with OLT, it is thus possible to effectively realize looped network protection, it is to avoid the paralysis of annular EPON occur, greatly
The reliability of annular EPON is improved greatly.Meanwhile, the passive light ring network in the present invention is simple in construction, is also easy to reality
It is existing.
Brief description of the drawings
Fig. 1 is PON networking modes schematic diagram of the prior art.
Fig. 2 be the embodiment of the present invention in optical branching device structural representation.
Fig. 3 be the embodiment of the present invention in annular EPON structural representation.
Fig. 4 be the embodiment of the present invention in annular EPON reverse method schematic diagram.
Embodiment
For technical scheme and advantage is more clearly understood, below in conjunction with drawings and the specific embodiments, to this
Invention is described in further detail.
Fig. 2 is the structural representation of the optical branching device in the embodiment of the present invention.As shown in Fig. 2 in the embodiment of the present invention
Optical branching device includes：First photo-coupler 201, the second photo-coupler 202 and shell 203；
First port 204, second port 205, the 3rd port 206 and the 4th port 207 are provided with the shell 203；
First photo-coupler 201 is connected with the first port 204 on the shell 203, the 3rd port 206 respectively；
Second photo-coupler 202 is connected with the second port 205 on the shell 203, the 4th port 207 respectively；Described first
One end of photo-coupler 201 is connected with one end of second photo-coupler 202；
First photo-coupler 201 respectively there is default wavelength to associate splitting ratio with the second photo-coupler 202；
First photo-coupler 201 will be inputted according to its default wavelength association splitting ratio from the first port 204
Light beam be respectively outputted to the 3rd port 206 and the second photo-coupler 202, and will be from the 3rd port 206 and the second optocoupler
The light beam that clutch 202 is inputted is output to the first port 204；
Second photo-coupler 202 will be inputted according to its default wavelength association splitting ratio from the second port 205
Light beam be respectively outputted to the 4th port 207 and the first photo-coupler 201, and will be from the 4th port 207 and the first optocoupler
The light beam that clutch 201 is inputted is output to the second port 205.
Specifically, in the technical field of the present invention, described photo-coupler is that one kind is used for by a certain percentage dividing/closing
The Passive Optical Components of light beam.The definition of the splitting ratio of photo-coupler is：The power output ratio of each output port of photo-coupler.One
As for, the splitting ratio of photo-coupler is relevant with the wavelength for the light that it is transmitted.That is, for the different wave length that is inputted
Light beam, photo-coupler is by with different splitting ratios.For example, a photo-coupler is in the light beam that transmission wavelength is 1.31 microns
When, the splitting ratio of two output end is 50：50, will the light beam 50% power respectively from the output of two output ends；And
When transmission wavelength is 1.5 microns of light beam, the splitting ratio of two output end is then changed into 70：30, will the light beam 70% work(
Rate is exported from first output end, and the power of the light beam 30% is exported from second output end.Therefore, also can be by photo-coupler
Splitting ratio be referred to as wavelength association splitting ratio.
In a particular embodiment of the present invention, the photo-coupler 202 of the first photo-coupler 201 and second all has respectively
Default wavelength associates splitting ratio.Preferably, in a particular embodiment of the present invention, the wavelength of first photo-coupler 201
Associate splitting ratio identical with the wavelength association splitting ratio of the second photo-coupler 202.In addition, in another specific implementation of the present invention
In example, the wavelength association splitting ratio of first photo-coupler 201 associates splitting ratio with the wavelength of the second photo-coupler 202 and also may be used
To differ.
The wavelength association splitting ratio with first photo-coupler is associated into light splitting with the wavelength of the second photo-coupler below
Exemplified by identical, technical scheme is further introduced.
Preferably, in a particular embodiment of the present invention, when the wavelength of the light beam of input is default first wave length λ 1,
It is 10 that the wavelength association splitting ratio of first photo-coupler 201, which associates splitting ratio with the wavelength of the second photo-coupler 202,：90；
Or, when the wavelength of the light beam of input is default second wave length λ 2, the wavelength association light splitting of first photo-coupler 201
It is 20 to associate splitting ratio than the wavelength with the second photo-coupler 202：80；Or, when the wavelength of the light beam of input is default the
During wavelength lambda 3, the wavelength association splitting ratio of first photo-coupler 201 associates light splitting with the wavelength of the second photo-coupler 202
Than for 30：70.
For example, when wavelength is input in the first photo-coupler 201 for λ 1 light beam from first port 204, described first
Photo-coupler 201 is by the power output of the inputs light beam 90% to the second photo-coupler 202, by the power output of the light beam 10%
To the 3rd port 206；When power output to the second photo-coupler 202 of the light beam 90%, the second photo-coupler 202 will be connect
90% power of the light beam received（81% power of the light beam inputted from first port 204）Export to second port
205, therefore, overall, when wavelength inputs for the first port 204 of the optical branching device shown in λ 1 light beam from Fig. 2,
81% power of the light beam will be exported from the second port 205 of the optical branching device, and 10% power of the light beam will be from the light
3rd port 206 of shunt is exported.
Similarly, when wavelength is input in the second photo-coupler 202 for λ 1 light beam from second port 205, described second
Photo-coupler 202 is by the power output of the inputs light beam 90% to the first photo-coupler 201, by the power output of the light beam 10%
To the 4th port 207；When power output to the first photo-coupler 201 of the light beam 90%, the first photo-coupler 201 will be connect
90% power of the light beam received（81% power of the light beam inputted from second port 205）Export to first port
204, therefore, overall, when wavelength inputs for λ 1 light beam from the second port 205 of the optical branching device, the light beam
81% power will be exported from the first port 204 of the optical branching device, 10% power of the light beam will be from the optical branching device
The 4th port 207 export.
In addition, when wavelength is input in the first photo-coupler 201 for λ 1 light beam from the 3rd port 206, described first
Photo-coupler 201 is by the power output of the inputs light beam 10% to first port 204；And when wavelength for λ 1 light beam from the 4th end
Mouthfuls 207 when being input in the second photo-coupler 202, and second photo-coupler 202 is by the power output of the inputs light beam 10%
To second port 205.Therefore, overall, when wavelength inputs for λ 1 light beam from the 3rd port 206 of the optical branching device
When, 10% power of the light beam will be exported from the first port 204 of the optical branching device；When wavelength divides for λ 1 light beam from the light
During the 4th port 207 input of road device, 10% power of the light beam will be exported from the second port 205 of the optical branching device.
It can be seen from above-mentioned record, the optical branching device in the embodiment of the present invention has multiple ports, but also can lead to
Cross and adjust the wavelength of inputted light beam dynamically to change the splitting ratio of the optical branching device, and then change each end of the optical branching device
The power of mouth output beam.Therefore, when the optical branching device is used for multiple cascades, the light with mean allocation power in the prior art
Shunt is compared, and its power budget has obvious advantage, therefore goes in EPON, is especially suitable for group
Build annular EPON.
Using the optical branching device shown in Fig. 2, corresponding annular EPON can be set up.
Fig. 3 be the embodiment of the present invention in annular EPON structural representation.As shown in figure 3, the present invention is implemented
Annular EPON in example includes：OLT, multiple optical branching devices and multiple ONU；
The first OLT ports and the 2nd OLT ports are provided with the OLT；
The multiple optical branching device is connected in series by the first port 204 and second port 205 of each optical branching device；
The first OLT ports of the OLT are connected by optical fiber with the first port 204 of first optical branching device, the OLT
The 2nd OLT ports be connected by optical fiber with the second port 205 of last optical branching device, formed ring-like network structure；
Each ONU corresponds respectively to an optical branching device；
The first first line of a couplet port and the second first line of a couplet port are provided with each ONU；Each ONU the first first line of a couplet port and
The 3rd port 206 and the 4th port 207 that corresponding optical branching device is distinguished in two first line of a couplet ports are connected.
Wherein, above-mentioned optical branching device is the optical branching device shown in Fig. 2, thus optical branching device concrete structure herein
Repeat no more.
By taking Fig. 3 as an example, there are an OLT, 6 optical branching devices and 6 ONU in the annular EPON shown in Fig. 3.Its
In, OLT the first OLT ports are connected with the first port 204 of optical branching device 1, second port 205 and the light point of optical branching device 1
The first port 204 of road device 2 is connected ... ..., and the second port 205 of optical branching device 5 connects with the first port 204 of optical branching device 6
Connect, the second port 205 of optical branching device 6 is connected with OLT the 2nd OLT ports, so as to form a ring-like network structure.6
Individual ONU corresponds respectively to 6 optical branching devices, and each ONU the first first line of a couplet port and the second first line of a couplet port is corresponding respectively
Optical branching device the 3rd port 206 and the 4th port 207 connect.
When the annular EPON normal work shown in Fig. 3, an annular working link can be formed（As in Fig. 3
Double-head arrow shown in）.For example, the light beam exported from OLT the first OLT ports is transferred to the first of optical branching device 1 by optical fiber
During port 204,10% power of the light beam will be transferred to ONU1 the first first line of a couplet end from the 3rd port 206 of optical branching device 1
Mouth is simultaneously input in ONU1, and 81% power of the light beam will be transferred to optical branching device 2 from the second port 205 of optical branching device 1
First port 204；..., the like, until the light beam is transferred to OLT eventually through the second port 205 of optical branching device 6
The 2nd OLT ports.Now, OLT the 2nd OLT ports not output beam and only receive light beam, therefore can be by OLT now
The 2nd OLT ports be referred to as OLT receiving port.So, when OLT the 2nd OLT ports are received by OLT the first OLT ends
During the light beam of mouth output, you can show that above-mentioned annular EPON is currently under normal operating conditions.
Now, when in the annular working link normal work, OLT the first OLT ports can export and receive light beam, and
OLT the 2nd OLT ports（That is OLT receiving port）It is only capable of receiving light beam without output beam；Each ONU is by first
Join port to receive or output beam；And each optical branching device is then by first port 204 and second port 205 by beam Propagation
Give OLT or next optical branching devices, and by the 3rd port 206 by beam Propagation is to connected ONU or passes through the 3rd
Port 206 receives the light beam of connected ONU outputs.
In the inventive solutions, due to being provided with two OLT ports on the OLT in annular EPON, and
Two first line of a couplet ports are then provided with ONU, therefore in addition to the annular working link shown in Fig. 3, in the annular nothing of the present invention
Other annular working links can also be formed in the optical-fiber network of source.For example, the light beam exported from OLT the 2nd OLT ports passes through
When optical fiber is transferred to the second port 205 of optical branching device 6,10% power of the light beam is by from the 4th port of optical branching device 6
207 are transferred to ONU6 the second first line of a couplet port and are input in ONU6, and 81% power of the light beam is by from the of optical branching device 6
Single port 204 is transferred to the second port 205 of optical branching device 5；..., the like, until the light beam is eventually through optical branching
The first port 204 of device 1 is transferred to OLT the first OLT ports.Now, OLT the first OLT ports not output beam and only
Light beam is received, therefore the first OLT ports of OLT now can be referred to as to OLT receiving port.So, as OLT the first OLT
When port receives the light beam by OLT the 2nd OLT ports output, you can show that above-mentioned annular EPON is currently under
Normal operating conditions.
Now, when in the annular working link normal work, OLT the 2nd OLT ports can export and receive light beam, and
OLT the first OLT ports（That is OLT receiving port）It is only capable of receiving light beam without output beam；Each ONU is by second
Join port to receive or output beam；And each optical branching device is then by first port 204 and second port 205 by beam Propagation
Give OLT or next optical branching devices, and by the 4th port 207 by beam Propagation is to connected ONU or passes through the 4th
Port 207 receives the light beam of connected ONU outputs.
, can group by using the optical branching device shown in Fig. 2 it can be seen from the structure of above-mentioned annular EPON
Build corresponding annular EPON（For example, the annular EPON shown in Fig. 3）.Moreover, annular in the present invention
In EPON, because each optical branching device in optical-fiber network is not the luminous power of each port of mean allocation output, and
Simply by the fraction power transmission of inputs light beam to the ONU being connected with optical branching device, most of power of inputs light beam will
Next optical branching device is transferred to by optical branching device, therefore, even if without connection ONU on some optical branching device, also will not be right
Luminous power causes larger waste, so as to greatly save the luminous power of inputs light beam, improves the service efficiency of inputs light beam,
It is cost-effective.
In addition, in actual application, can be according to practical situations, by adjusting from the OLT light beams exported
Wavelength dynamically adjusts the splitting ratio of each optical branching device in annular EPON, and appropriate allotment being assigned on each ONU
Luminous power, it is ensured that light beam has enough power transmissions to next ONU, so that it is guaranteed that can be connected in annular EPON
Greater number of optical branching device and ONU.
In addition, in the inventive solutions, due to being provided with two OLT ends on the OLT in annular EPON
Mouthful, and two OLT ports can determine whether output beam according to practical situations, and be also both provided with each ONU
Two first line of a couplet ports, and the light beam that optical branching device is transmitted can be received by any one in the two first line of a couplet ports, therefore
When there is somewhere fibre break in above-mentioned annular EPON, active link can be switched, to ensure annular
The normal work of EPON.
For example, when annular EPON is in normal operating conditions, annular EPON can be used such as Fig. 3 institutes
The annular working link shown.Now, OLT the first OLT ports can export and receive light beam, and OLT the 2nd OLT ports are only
Light beam can be received without output beam；Each ONU is received or output beam by the first first line of a couplet port；And each optical branching device
OLT or next ONU then are given by beam Propagation by first port 204 and second port 205, and pass through the 3rd port
206 receive the light beam of connected ONU outputs by beam Propagation to connected ONU or by the 3rd port 206.
If at a time there is fibre break failure at one in annular EPON, for example, optical branching device 2 and light
Open circuit occurs for the optical fiber between shunt 3, and now, optical branching device 1 and optical branching device 2 are due to before breaking optical fiber（That is light
At fine open circuit fault between OLT the first OLT ports）, therefore remain to receive the light from OLT the first OLT ports output
Beam, so the ONU1 and ONU2 that are connected with optical branching device 1 and optical branching device 2 are also uninfluenced, therefore without modification；But, its
Its each optical branching device（That is optical branching device 3,4,5 and 6）Due to after breaking optical fiber, therefore after fibre break, this 4
2nd OLT ports of individual optical branching device and OLT all can be no longer received by the light beam of OLT the first OLT ports output.Institute
With, when there is fibre break failure at one in the annular EPON, at fibre break failure and OLT the 2nd OLT
The receiving port of each optical branching device, ONU and OLT between port（For example, the 2nd OLT ports of the OLT in Fig. 3）It will all enter
Row active link switching operation, as shown in figure 4, each light point i.e. at fibre break failure between OLT the 2nd OLT ports
Road device will be connected thereto by the 4th port 207 by beam Propagation to connected ONU or by the reception of the 4th port 207
ONU output light beam；Each ONU at fibre break failure between OLT the 2nd OLT ports then passes through second first line of a couplet
Port is received or output beam；Now, OLT receiving port（For example, the 2nd OLT ports of the OLT in Fig. 3 and Fig. 4）Also will
For exporting and receiving light beam.
Similarly, when annular EPON is used to export and connect in normal operating conditions, and OLT the 2nd OLT ports
Receipts light beam, and OLT the first OLT ports（That is OLT receiving port）When being only capable of receiving light beam without output beam, if at certain
There is fibre break failure at one in one moment annular EPON（For example, the light between optical branching device 2 and optical branching device 3
Open circuit occurs for fibre）, now, the optical branching device and ONU at fibre break failure between OLT the 2nd OLT ports are uninfluenced,
The light beam from OLT the 2nd OLT ports output can be still received, so without modification；But at fibre break failure and OLT
The first OLT ports of each optical branching device, ONU and OLT between the first OLT ports will all be operated link switchover behaviour
Make, i.e., each optical branching device at fibre break failure between OLT the first OLT ports will be incited somebody to action by the 3rd port 206
Beam Propagation receives the light beam of connected ONU outputs to connected ONU or by the 3rd port 206；Fibre break
Each ONU at failure between OLT the first OLT ports is then received or output beam by the first first line of a couplet port；Now,
OLT the first OLT ports will also be used to exporting and receiving light beam.
After carrying out above-mentioned active link switching operation, at fibre break failure after each optical branching device, ONU and
OLT receiving port will all carry out the transmission of light beam according to new active link.Certainly, because active link now there occurs
Change, the path delay of OLT both sides will also change in EPON, so needing ONU and OLT to shift to an earlier date in standby port
Carry out the operation such as ranging.
In summary, in the inventive solutions, it is proposed that a kind of new optical branching device with multiple ports, and
And can dynamically change the splitting ratio of the optical branching device by adjusting the wavelength of inputted light beam, and then change the optical branching
The power of each port output beam of device, therefore above-mentioned optical branching device can be used to set up corresponding annular EPON.
In the annular EPON, because each optical branching device in optical-fiber network is not the light of each port of mean allocation output
Power, and simply by the fraction power transmission of inputs light beam to the ONU being connected with optical branching device, the major part of inputs light beam
Power will be transferred to next optical branching device by optical branching device, therefore, even if without connection ONU on some optical branching device,
Larger waste will not be caused to luminous power, so as to greatly save the luminous power of inputs light beam, making for inputs light beam is improved
It is cost-effective with efficiency.Being additionally, since can be passive dynamically to adjust annular by adjusting the wavelength from the OLT light beams exported
The splitting ratio of the optical branching device of each in optical-fiber network, appropriate allotment is assigned to the luminous power on each ONU, it is ensured that light beam has enough
Power transmission is on next ONU, so as to ensure that greater number of optical branching device can be connected in annular EPON
And ONU.In addition, in the annular EPON using the present invention, even if when generation somewhere optical fiber in annular EPON
When breaking, the follow-up ONU after breaking optical fiber still can be realized with OLT to communicate, it is thus possible to effectively realize looped network protection,
The paralysis of annular EPON is avoided the occurrence of, the reliability of annular EPON is substantially increased.Meanwhile, in the present invention
Passive light ring network is simple in construction, is also easy to realize.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (9)
1. a kind of optical branching device, it is characterised in that the optical branching device includes：First photo-coupler, the second photo-coupler and shell；
First port, second port, the 3rd port and the 4th port are provided with the shell；
First photo-coupler is connected with the first port on the shell, the 3rd port respectively；Second photo-coupler
It is connected respectively with the second port on the shell, the 4th port；One end of first photo-coupler and second optocoupler
One end connection of clutch；
First photo-coupler and the second photo-coupler respectively there is default wavelength to associate splitting ratio；
First photo-coupler associates splitting ratio according to its default wavelength and distinguishes the light beam inputted from the first port
The 3rd port and the second photo-coupler are output to, and the light beam from the 3rd port and the input of the second photo-coupler is output to
The first port；
Second photo-coupler associates splitting ratio according to its default wavelength and distinguishes the light beam inputted from the second port
The 4th port and the first photo-coupler are output to, and the light beam from the 4th port and the input of the first photo-coupler is output to
The second port.
2. optical branching device according to claim 1, it is characterised in that：
The wavelength association splitting ratio of first photo-coupler associates splitting ratio with the wavelength of the second photo-coupler and differed.
3. optical branching device according to claim 1, it is characterised in that：
The wavelength association splitting ratio of first photo-coupler is identical with the wavelength association splitting ratio of the second photo-coupler.
4. optical branching device according to claim 3, it is characterised in that：
When input light beam wavelength be default first wave length λ 1 when, first photo-coupler wavelength association splitting ratio with
The wavelength association splitting ratio of second photo-coupler is 10：90；
Or, when the wavelength of the light beam of input is default second wave length λ 2, the wavelength association point of first photo-coupler
It is 20 that light associates splitting ratio than the wavelength with the second photo-coupler：80；
Or, when the wavelength of the light beam of input is default wavelength lambda 3, the wavelength association point of first photo-coupler
It is 30 that light associates splitting ratio than the wavelength with the second photo-coupler：70.
5. a kind of annular EPON, it is characterised in that the annular EPON includes：Optical line terminal OLT, Duo Geru
Optical branching device and multiple optical network unit ONUs described in claim 1；
The first OLT ports and the 2nd OLT ports are provided with the OLT；
The multiple optical branching device is connected in series by the first port and second port of each optical branching device；
The first OLT ports of the OLT are connected by optical fiber with the first port of first optical branching device, and the second of the OLT
OLT ports are connected by optical fiber with the second port of last optical branching device, form ring-like network structure；
Each ONU corresponds respectively to an optical branching device；
The first first line of a couplet port and the second first line of a couplet port are provided with each ONU；On each ONU the first first line of a couplet port and second
Join the 3rd port and the connection of the 4th port that corresponding optical branching device is distinguished in port.
6. annular EPON according to claim 5, it is characterised in that：
When the annular EPON normal work, the first OLT ports of the OLT are used to exporting and receiving light beam；Institute
Stating OLT the 2nd OLT ports is used to receive light beam；Each ONU is received or output beam by the first first line of a couplet port；Each light
Beam Propagation is then given the OLT or next optical branching devices by shunt by first port and second port, and is passed through
3rd port receives the light beam of connected ONU outputs by beam Propagation to connected ONU or by the 3rd port.
7. annular EPON according to claim 6, it is characterised in that：
When there is fibre break failure at one in the annular EPON, at fibre break failure and OLT the 2nd OLT
Each optical branching device between port connects by the 4th port by beam Propagation to connected ONU or by the 4th port
Receive the light beam of connected ONU outputs；Each ONU at fibre break failure between OLT the 2nd OLT ports passes through
Second first line of a couplet port is received or output beam；OLT the 2nd OLT ports are used to exporting and receiving light beam.
8. annular EPON according to claim 5, it is characterised in that：
When the annular EPON normal work, the 2nd OLT ports of the OLT are used to exporting and receiving light beam；Institute
Stating OLT the first OLT ports is used to receive light beam；Each ONU is received or output beam by the second first line of a couplet port；Each light
Beam Propagation is then given the OLT or next optical branching devices by shunt by first port and second port, and is passed through
4th port receives the light beam of connected ONU outputs by beam Propagation to connected ONU or by the 4th port.
9. annular EPON according to claim 8, it is characterised in that：
When there is fibre break failure at one in the annular EPON, at fibre break failure and OLT the first OLT
Each optical branching device between port connects by the 3rd port by beam Propagation to connected ONU or by the 3rd port
Receive the light beam of connected ONU outputs；Each ONU at fibre break failure between OLT the first OLT ports passes through
First first line of a couplet port is received or output beam；OLT the first OLT ports are used to exporting and receiving light beam.
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|---|---|---|---|---|
| WO2005098994A1 (en) * | 2004-04-12 | 2005-10-20 | Gyeongsang National University | Thread-type flexible battery |
| US7272321B1 (en) * | 1999-05-10 | 2007-09-18 | Alloptic, Inc. | Passive optical network |
| CN101895463A (en) * | 2010-04-20 | 2010-11-24 | 上海大学 | System and method for achieving network reconfigurability of mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network) |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7272321B1 (en) * | 1999-05-10 | 2007-09-18 | Alloptic, Inc. | Passive optical network |
| WO2005098994A1 (en) * | 2004-04-12 | 2005-10-20 | Gyeongsang National University | Thread-type flexible battery |
| CN101895463A (en) * | 2010-04-20 | 2010-11-24 | 上海大学 | System and method for achieving network reconfigurability of mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network) |
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