CN102045604B - Wavelength division multiplexing (WDM) module and method for realizing single-fiber transmission in 10G Ethernet passive optical network (EPON) system - Google Patents
Wavelength division multiplexing (WDM) module and method for realizing single-fiber transmission in 10G Ethernet passive optical network (EPON) system Download PDFInfo
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Abstract
The invention relates to a wavelength division multiplexing (WDM) module and method for realizing single-fiber transmission in a 10giga (G) Ethernet passive optical network (EPON) system. The WDM module comprises a three-channel WDM module installed at the optical line terminal (OLT) and a two-channel WDM module installed at the optical network unit (ONU) terminal, wherein the three-channel WDM module completes WDM of the three-channel four-wavelength optical signals; and the two-channel WDM module completes WDM of two-channel two-wavelength optical signals. The WDM module and the method have the following beneficial effects: the WDM module and the method avoid overlap of the two kinds of optical signals by controlling the wavelength range of the optical signals with the wavelength of 1270nm to be 1270+/-6.5nm and controlling the wavelength range of the optical signals with the wavelength of 1310nm to be 1280-1360nm, thus realizing WDM of the optical signals with various wavelengths, so that the 10G EPON system can adopt the single fiber for transmission, thus simplifying networking.
Description
Technical field
The present invention relates to multiple wavelength optical signal wavelength-division multiplex technique field in 10G EPON system, is WDM module and the method that realizes the single fiber transmission in 10G EPON system specifically.
Background technology
At present, main flow PON (EPON) technology has obtained obvious progress and beginning large scale deployment.EPON (Ethernet passive optical network), GPON (Gigabit Passive Optical Network) technology all obtain greater advance at aspects such as technical standard, functions of the equipments and performance, interoperability equipment costs, and these all indicate maturation and the sizable application of second generation PON technology.But on the other hand, some new business (as HDTV (high definition TV), the net business such as true), new network design mode are had higher requirement to the PON technology, even surpass 100 users such as requiring each ONU (optical network unit) to cover tens, each PON mouth covers number of users and can reach 512 even higher.Along with the maturation of 10Gbps technology, under the driving of this business demand, industry begin one's study and develop have high-transmission ability more, PON technology of future generation---the 10G EPON of stronger business support ability, more perfect management and control function.
The main feature of 10G EPON technology is:
1,10Gbps and above transmission rate, the symmetrical 10Gbps of up-downgoing or the up 1Gpbs of descending 10Gbps;
2, higher shunt ratio, support 1: 64 at least;
3, stronger networking capability;
4, to the compatibility of EPON/GPON.
Since 2005, IEEE just began research and the standardization effort of 10G EPON technology, had issued the IEEE802.3av standard in September, 2009.
For the compatibility that realizes 10G EPON and 1G EPON and the smooth evolution of network, IEEE 802.3av standard is having special consideration aspect Wavelength Assignment, multiple spot controlling mechanism, coexists on same ODN (Optical Distribution Network) to guarantee 10G EPON and 1G EPON system.
As shown in Figure 1, aspect wavelength planning, for realizing the compatibility of 10G EPON and 1G EPON, 10G EPON does not use the 1490nm that the 1G EPON system uses (downstream wavelength of 1480nm～1500nm), ((1574nm～1580nm) is as the wavelength of 10Gbps downstream signal for 1600～1650nm), IEEE802.3av Standard Selection 1577nm to consider simultaneously to avoid analog video wavelength 1550nm and OTDR (optical time domain reflectometer) test wavelength.Therefore, in descending (Downstream) direction, 10Gbps signal and 1Gbps signal are WDM (wavelength division multiplexing) mode.And up (Upstream) direction, the wavelength of 1Gbps signal is 1310nm (1260～1360nm), IEEE802.3av standard code 10Gbps signal uplink wavelength is 1270nm (1260～1280nm), and that this has is overlapping, the WDM mode can not be adopted, dual rate TDMA (time division multiplexing) mode can only be adopted.Therefore cause the problems that to use two fine transmission in 10G EPON system, make troubles to networking.
Summary of the invention
For the defective that exists in prior art, the object of the present invention is to provide the WDM module and the method that realize the single fiber transmission in 10G EPON system, by controlling the wave-length coverage of 1270nm and two wavelength light signals of 1310nm, avoid two kinds of light signals lap to occur, thereby realize the wavelength division multiplexing of each wavelength light signal, make 10G EPON system can use the single fiber transmission, simplify networking.
For reaching above purpose, the technical scheme that the present invention takes is:
Realize the WDM module of single fiber transmission in 10G EPON system, it is characterized in that, comprising: be arranged on the triple channel WDM module of OLT end and be arranged on the two passage WDM modules that ONU holds,
Described triple channel WDM module comprises with lower component:
1270nm Coarse Wavelength Division Multiplexing band pass filter, the input of 1270nm Coarse Wavelength Division Multiplexing band pass filter connects the optical fiber common port, 1270nm Coarse Wavelength Division Multiplexing band pass filter transparent transmission 1270 ± 6.5nm light signal is to the 1270nm light signal output end, the 1270nm light signal output end is used for connecting 1270nm passage tail optical fiber
1270nm Coarse Wavelength Division Multiplexing band pass filter refracted optical signal is to T 1310﹠amp; 1490/R 1550nm wavelength division multiplexing band pass filter, T 1310﹠amp; 1490/R 1550nm wavelength division multiplexing band pass filter transparent transmission 1310﹠amp; The 1490nm light signal is to 1310﹠amp; The 1490nm light signal output end, and with 1310nm light signal scope control at 1280nm～1360nm, 1310﹠amp; The 1490nm light signal output end is used for connecting 1310﹠amp; 1490nm passage tail optical fiber,
Described two passage WDM modules comprise with lower component:
On the basis of technique scheme, in triple channel WDM module, described 1270nm Coarse Wavelength Division Multiplexing band pass filter, T 1310﹠amp; 1490/R 1550nm wavelength division multiplexing band pass filter and 1577nm Coarse Wavelength Division Multiplexing band pass filter use respectively the encapsulation of metal tube, totally 3 metal tubes, and described metal tube is of a size of 5.5 * 38mm;
In two passage WDM modules, described T 1310/R 1550nm wavelength division multiplexing band pass filter and 1577nm Coarse Wavelength Division Multiplexing band pass filter use respectively the encapsulation of metal tube, totally 2 metal tubes, and described metal tube is of a size of 5.5 * 38mm.
On the basis of technique scheme, in triple channel WDM module, the fiber lengths of optical fiber common port is 30cm, and the fiber lengths of 1270nm light signal output end is 45cm, 1310nm﹠amp; The fiber lengths of 1490nm light signal output end is 56cm, and the fiber lengths of 1577nm light signal output end is 45cm;
In two passage WDM modules, the fiber lengths of optical fiber common port is 30cm, and the fiber lengths of 1310nm light signal output end is 45cm, and the fiber lengths of 1577nm light signal output end is 45cm.
On the basis of technique scheme, in triple channel WDM module, the optical fiber common port is provided with SC/PC type adapter, 1310﹠amp; 1490 light signal output ends are provided with SC/PC type adapter, and 1270nm and 1577nm light signal output end are provided with LC/PC type adapter;
In two passage WDM modules, the optical fiber common port is provided with SC/PC type adapter, and 1270nm and 1577nm light signal output end are provided with LC/PC type adapter.
Realize the single fiber transmission method in a kind of 10G EPON system of above-mentioned WDM module, it is characterized in that:
Inner at 10G OLT:
The 1577nm passage tail optical fiber of 10G OLT PON optical module transmitting terminal connecting tee road WDM module,
The 1270nm passage tail optical fiber of 10G OLT PON optical module receiving terminal connecting tee road WDM module;
1G OLT PON optical module is by flange connecting tee road WDM module " T 1310﹠amp; 1490/R 1550nm " the passage tail optical fiber,
After connection is completed, according to OLT﹠amp; The actual single-deck situation of ONU is determined the fine scheme of dish, and by coiling fine support to after coiling fibre and being fixed, the optical fiber common port of triple channel WDM module connects the panel flange of 10GOLT;
Inner at 10G ONU:
10G ONU PON optical module transmitting terminal connects the 1270nm passage tail optical fiber of two passage WDM modules,
10G ONU PON optical module receiving terminal connects the 1577nm passage tail optical fiber of two passage WDM modules,
After connection is completed, according to OLT﹠amp; The actual single-deck situation of ONU is determined the fine scheme of dish, and by coiling fine support to after coiling fibre and being fixed, the optical fiber common port of two passage WDM modules connects the panel flange of 10GONU;
The main fibre of 10G OLT is connected to splitter from the panel flange of 10G OLT, and the optical fiber of 10G ONU is connected to splitter from the panel flange of 10G ONU, and described splitter is the 1:32 splitter.
On the basis of technique scheme, hang simultaneously as required 10G ONU and 1G ONU below splitter.
Realize WDM module and the method for single fiber transmission in 10G EPON of the present invention system, by controlling the wave-length coverage of 1270nm and two wavelength light signals of 1310nm, making the 1270nm wave-length coverage is 1270 ± 6.5nm, making the 1310nm wave-length coverage is 1280～1360nm, avoid two kinds of light signals lap to occur, thereby realize the wavelength division multiplexing of each wavelength light signal, make 10G EPON system can use the single fiber transmission, simplify networking.
Description of drawings
The present invention has following accompanying drawing:
The planning of Fig. 1 10G EPON system wavelength,
The structure of Fig. 2 triple channel WDM module,
The structure of Fig. 3 two passage WDM modules,
Fig. 4 10G EPON system group network figure.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention is by controlling wave-length coverage, (controlling the 1270nm wave-length coverage is 1270 ± 6.5nm to make up wavelength overlapping phenomenon not occur, controlling the 1310nm wave-length coverage is 1280～1360nm), thereby the light signal wavelength division multiplexing of each wavelength, realize the single fiber transmission, simplified the networking of 10G EPON system, made the compatible 10G﹠amp better of 10G EPON system; 1G ONU.
The present invention has provided the WDM module that realizes the single fiber transmission in following 10G EPON system, described WDM module comprises: be arranged on the triple channel WDM module of OLT end and be arranged on the two passage WDM modules that ONU holds, described triple channel WDM module is completed the wavelength division multiplexing of triple channel four wavelength light signals; Described two passage WDM modules are completed the wavelength division multiplexing of two passage two wavelength light signals;
As shown in Figure 2, described triple channel WDM module comprises with lower component:
1270nm Coarse Wavelength Division Multiplexing band pass filter (1270nm CWDM Bandpass filter), the input of 1270nm Coarse Wavelength Division Multiplexing band pass filter connects optical fiber common port (Comfiber), 1270nm Coarse Wavelength Division Multiplexing band pass filter transparent transmission 1270 ± 6.5nm light signal is to 1270nm light signal output end (1270nm Pass port), the 1270nm light signal output end is used for connecting 1270nm passage tail optical fiber
It is the 1270nm Coarse Wavelength Division Multiplexing band pass filter of OSM-D-1-01-270-1-C-L-04-SU that described 1270nm Coarse Wavelength Division Multiplexing band pass filter can be selected model;
1270nm Coarse Wavelength Division Multiplexing band pass filter refracted optical signal is to T 1310﹠amp; 1490/R 1550nm wavelength division multiplexing band pass filter (T 1310﹠amp; 1490/R 1550nm WDM Bandpass filter), T 1310﹠amp; 1490/R 1550nm wavelength division multiplexing band pass filter transparent transmission 1310﹠amp; The 1490nm light signal is to 1310﹠amp; 1490nm light signal output end (1310﹠amp; 1490nm Pass port), and with 1310nm light signal scope control at 1280nm～1360nm, 1310﹠amp; The 1490nm light signal output end is used for connecting 1310﹠amp; 1490nm passage tail optical fiber,
Described T 1310﹠amp; It is the T 1310﹠amp of OSM-D-1-01-1310-1-C-L-04-SU that 1490/R 1550nm wavelength division multiplexing band pass filter can be selected model; 1490/R 1550nm wavelength division multiplexing band pass filter;
It is the 1577nm Coarse Wavelength Division Multiplexing band pass filter of OSM-D-1-01-577-1-C-L-04-SU that described 1577nm Coarse Wavelength Division Multiplexing band pass filter can be selected model.
On the basis of technique scheme, in triple channel WDM module, described 1270nm Coarse Wavelength Division Multiplexing band pass filter, T 1310﹠amp; 1490/R 1550nm wavelength division multiplexing band pass filter and 1577nm Coarse Wavelength Division Multiplexing band pass filter use respectively the encapsulation of metal tube, totally 3 metal tubes, and described metal tube is of a size of 5.5 * 38mm.
On the basis of technique scheme, in triple channel WDM module, the fiber lengths of optical fiber common port is 30cm, and the fiber lengths of 1270nm light signal output end is 45cm, 1310nm﹠amp; The fiber lengths of 1490nm light signal output end is 56cm, and the fiber lengths of 1577nm light signal output end is 45cm.The fine situation of dish during fiber lengths can use according to reality customizes.
On the basis of technique scheme, in triple channel WDM module, the optical fiber common port is provided with SC/PC (standard flat square joint) type adapter, 1310﹠amp; 1490 light signal output ends are provided with SC/PC (standard flat square joint) type adapter, and 1270nm and 1577nm light signal output end are provided with LC/PC (small-sized plane square joint) type adapter.
Triple channel WDM module is for realizing 1270nm, 1310﹠amp; 1490nm, 1577nm triple channel Wavelength division multiplexing module by controlling the scope of 1270nm and two kinds of wavelength of 1310nm, make them wavelength not occur overlapping, thereby realize wavelength division multiplexing.The parameters such as insertion loss, the wavelength temperature that this module while has accurately been controlled individual wavelength signals waftd, return loss, luminous power, design parameter such as table 1:
Table 1 triple channel WDM module parameter table
As shown in Figure 3, described two passage WDM modules comprise with lower component:
It is the T 1310/R 1550nm wavelength division multiplexing band pass filter of OSM-D-1-01-1310-2-C-L-04-SU that described T 1310/R 1550nm wavelength division multiplexing band pass filter can be selected model;
It is the 1577nm Coarse Wavelength Division Multiplexing band pass filter of OSM-D-1-01-577-1-C-L-04-SU that described 1577nm Coarse Wavelength Division Multiplexing band pass filter can be selected model.
On the basis of technique scheme, in two passage WDM modules, described T 1310/R 1550nm wavelength division multiplexing band pass filter and 1577nm Coarse Wavelength Division Multiplexing band pass filter use respectively the encapsulation of metal tube, totally 2 metal tubes, and described metal tube is of a size of 5.5 * 38mm.
On the basis of technique scheme, in two passage WDM modules, the fiber lengths of optical fiber common port is 30cm, (wave-length coverage is 1260nm-1360nm to 1310nm, comprising the 1270nm light signal) fiber lengths of light signal output end is 45cm, the fiber lengths of 1577nm light signal output end is 45cm.The fine situation of dish during fiber lengths can use according to reality customizes;
On the basis of technique scheme, in two passage WDM modules, the optical fiber common port is provided with SC/PC (standard flat square joint) type adapter, and 1270nm and 1577nm light signal output end are provided with LC/PC (small-sized plane square joint) type adapter.
Two passage WDM modules are for realizing 1310nm (wave-length coverage is 1260nm-1360nm, comprises the 1270nm light signal) and 1577nm two passage Wavelength division multiplexing modules.The parameters such as insertion loss, the wavelength temperature that this module while has accurately been controlled individual wavelength signals waftd, return loss, luminous power, design parameter such as table 2:
Table 2 liang passage WDM module table parameter
| Operating Temperature (operating temperature | ℃ | -5℃～+65℃ |
| Storage Temperature (storing temperature) | ℃ | -40℃～+85℃ |
| Fiber Type (fiber type) | / | |
| Connector Type (connector type) | / | |
| Pigtail Type (tail optical fiber type) | / | |
| Pigtail Lengt (tail optical fiber length) | m | |
| Package Dimension (package dimension) | mm | 5.5×38 |
In table 2, the implication of each parameter is with table 1.
Realize in above-mentioned 10G EPON system on the basis of WDM module of single fiber transmission, the present invention gives the method that realizes the single fiber transmission in a kind of 10G EPON system, 10G EPON system group network figure as shown in Figure 4.
Inner at 10G OLT, the 1577nm passage tail optical fiber of 10G OLT PON optical module transmitting terminal connecting tee road WDM module, the 1270nm passage tail optical fiber of 10G OLT PON optical module receiving terminal connecting tee road WDM module; 1G OLT PON optical module is by flange connecting tee road WDM module " T 1310﹠amp; 1490/R 1550nm " the passage tail optical fiber, after connection is completed, according to OLT﹠amp; The actual single-deck situation of ONU is determined the fine scheme of dish, and by coiling fine support to after coiling fibre and being fixed, the optical fiber common port of triple channel WDM module connects the panel flange of 10G OLT;
Inner at 10G ONU, 10G ONU PON optical module transmitting terminal connects the 1270nm passage tail optical fiber of two passage WDM modules, and 10G ONU PON optical module receiving terminal connects the 1577nm passage tail optical fiber of two passage WDM modules, after connection is completed, according to OLT﹠amp; The actual single-deck situation of ONU is determined the fine scheme of dish, and by coiling fine support to after coiling fibre and being fixed, the optical fiber common port of two passage WDM modules connects the panel flange of 10G ONU;
The main fibre of 10G OLT is connected to splitter from the panel flange of 10G OLT, and the optical fiber of 10G ONU is connected to splitter from the panel flange of 10G ONU, and described splitter is the 1:32 splitter.
On the basis of technique scheme, hang simultaneously as required 10G ONU and 1G ONU below splitter.The wave separater situation of closing of light signal in each part and 10GOLT/10G ONU in 10G EPON system as shown in Figure 4, the 10G/1G optical module is by triple channel WDM module in 10G OLT, go out single fiber to panel, connect splitter (1:32) after connecting main fibre, connect 10G ONU and 1G ONU under splitter, 10G ONU realizes that by two passage WDM modules the single fiber light signal is to the conversion of the two fine light signals of 10G ONU optical module in inside.
The present invention overcomes the two fine transmission of 10G optical module and 10G﹠amp by said method and WDM module; The partly overlapping problem of the up wavelength of 1G realizes single fiber transmission in 10G EPON system, supports simultaneously 10G ONU and 1G ONU, and networking is succinctly convenient, is conducive to 1G EPON system seamlessly transitting to 10G EPON system.
Claims (6)
1.10G realize the WDM module of single fiber transmission in the EPON system, it is characterized in that, comprising: be arranged on the triple channel WDM module of OLT end and be arranged on the two passage WDM modules that ONU holds,
Described triple channel WDM module comprises with lower component:
1270nm Coarse Wavelength Division Multiplexing band pass filter, the input of 1270nm Coarse Wavelength Division Multiplexing band pass filter connects the optical fiber common port, 1270nm Coarse Wavelength Division Multiplexing band pass filter transparent transmission 1270 ± 6.5nm light signal is to the 1270nm light signal output end, the 1270nm light signal output end is used for connecting 1270nm passage tail optical fiber
1270nm Coarse Wavelength Division Multiplexing band pass filter refracted optical signal is to T 1310﹠amp; 1490/R 1550nm wavelength division multiplexing band pass filter, T 1310﹠amp; 1490/R 1550nm wavelength division multiplexing band pass filter transparent transmission 1310﹠amp; The 1490nm light signal is to 1310﹠amp; The 1490nm light signal output end, and with 1310nm light signal scope control at 1280nm～1360nm, 1310﹠amp; The 1490nm light signal output end is used for connecting 1310﹠amp; 1490nm passage tail optical fiber,
T 1310﹠amp; 1490/R 1550nm wavelength division multiplexing band pass filter refracted optical signal is to 1577nm Coarse Wavelength Division Multiplexing band pass filter, 1577nm Coarse Wavelength Division Multiplexing band pass filter transparent transmission 1577nm light signal is to the 1577nm light signal output end, and the 1577nm light signal output end is used for connecting 1577nm passage tail optical fiber;
Described two passage WDM modules comprise with lower component:
T 1310/R 1550nm wavelength division multiplexing band pass filter, the input of T 1310/R 1550nm wavelength division multiplexing band pass filter connects the optical fiber common port, T 1310/R 1550nm wavelength division multiplexing band pass filter transparent transmission 1310nm light signal is to the 1310nm light signal output end, the 1310nm light signal output end is used for connecting 1310nm passage tail optical fiber
T 1310/R 1550nm wavelength division multiplexing band pass filter refracted optical signal is to 1577nm Coarse Wavelength Division Multiplexing band pass filter, 1577nm Coarse Wavelength Division Multiplexing band pass filter transparent transmission 1577nm light signal is to the 1577nm light signal output end, and the 1577nm light signal output end is used for connecting 1577nm passage tail optical fiber.
2. realize the WDM module of single fiber transmission in 10G EPON as claimed in claim 1 system, it is characterized in that: in triple channel WDM module, described 1270nm Coarse Wavelength Division Multiplexing band pass filter, T 1310﹠amp; 1490/R 1550nm wavelength division multiplexing band pass filter and 1577nm Coarse Wavelength Division Multiplexing band pass filter use respectively the encapsulation of metal tube, totally 3 metal tubes, and described metal tube is of a size of 5.5 * 38mm;
In two passage WDM modules, described T 1310/R 1550nm wavelength division multiplexing band pass filter and 1577nm Coarse Wavelength Division Multiplexing band pass filter use respectively the encapsulation of metal tube, totally 2 metal tubes, and described metal tube is of a size of 5.5 * 38mm.
3. realize the WDM module of single fiber transmission in 10G EPON as claimed in claim 1 system, it is characterized in that: in triple channel WDM module, the fiber lengths of optical fiber common port is 30cm, and the fiber lengths of 1270nm light signal output end is 45cm, 1310nm﹠amp; The fiber lengths of 1490nm light signal output end is 56cm, and the fiber lengths of 1577nm light signal output end is 45cm;
In two passage WDM modules, the fiber lengths of optical fiber common port is 30cm, and the fiber lengths of 1310nm light signal output end is 45cm, and the fiber lengths of 1577nm light signal output end is 45cm.
4. realize the WDM module of single fiber transmission in 10G EPON as claimed in claim 1 system, it is characterized in that: in triple channel WDM module, the optical fiber common port is provided with SC/PC type adapter, 1310﹠amp; 1490 light signal output ends are provided with SC/PC type adapter, and 1270nm and 1577nm light signal output end are provided with LC/PC type adapter;
In two passage WDM modules, the optical fiber common port is provided with SC/PC type adapter, and 1310nm and 1577nm light signal output end are provided with LC/PC type adapter.
5. realize the single fiber transmission method in the 10G EPON system based on the described WDM module of claim 1, it is characterized in that:
Inner at 10G OLT:
The 1577nm passage tail optical fiber of 10G OLT PON optical module transmitting terminal connecting tee road WDM module,
The 1270nm passage tail optical fiber of 10G OLT PON optical module receiving terminal connecting tee road WDM module;
1G OLT PON optical module is by flange connecting tee road WDM module " T 1310﹠amp; 1490/R 1550nm " the passage tail optical fiber,
After connection is completed, according to OLT﹠amp; The actual single-deck situation of ONU is determined the fine scheme of dish, and by coiling fine support to after coiling fibre and being fixed, the optical fiber common port of triple channel WDM module connects the panel flange of 10G OLT;
Inner at 10G ONU:
10G ONU PON optical module transmitting terminal connects the 1310nm passage tail optical fiber of two passage WDM modules,
10G ONU PON optical module receiving terminal connects the 1577nm passage tail optical fiber of two passage WDM modules,
After connection is completed, according to OLT﹠amp; The actual single-deck situation of ONU is determined the fine scheme of dish, and by coiling fine support to after coiling fibre and being fixed, the optical fiber common port of two passage WDM modules connects the panel flange of 10G ONU;
The main fibre of 10G OLT is connected to splitter from the panel flange of 10G OLT, and the optical fiber of 10G ONU is connected to splitter from the panel flange of 10G ONU, and described splitter is 1: 32 splitter.
6. realize the single fiber transmission method in 10G EPON as claimed in claim 5 system, it is characterized in that: hang simultaneously as required 10G ONU and 1G ONU below splitter.
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| CN101835070A (en) * | 2010-05-06 | 2010-09-15 | 上海大学 | System and method for realizing wavelength reusing and broadcasting functions of wavelength division multiplexing passive optical network |
| CN101877802A (en) * | 2010-05-28 | 2010-11-03 | 浙江大学 | Wavelength division multiplexing passive optical network based on circulating wavelength routing characteristic of wavelength division multiplexer |
| CN101902666A (en) * | 2010-04-23 | 2010-12-01 | 中兴通讯股份有限公司 | Optical code-division multiple-access (OCDMA) passive optical network system, optical distribution network device and optical line terminal |
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| CN101902666A (en) * | 2010-04-23 | 2010-12-01 | 中兴通讯股份有限公司 | Optical code-division multiple-access (OCDMA) passive optical network system, optical distribution network device and optical line terminal |
| CN101835070A (en) * | 2010-05-06 | 2010-09-15 | 上海大学 | System and method for realizing wavelength reusing and broadcasting functions of wavelength division multiplexing passive optical network |
| CN101877802A (en) * | 2010-05-28 | 2010-11-03 | 浙江大学 | Wavelength division multiplexing passive optical network based on circulating wavelength routing characteristic of wavelength division multiplexer |
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