CN101729943B - System and method for using wavelength division multiplex passive optical network to realize sharing of downlink wavelength - Google Patents
System and method for using wavelength division multiplex passive optical network to realize sharing of downlink wavelength Download PDFInfo
- Publication number
- CN101729943B CN101729943B CN2009101995514A CN200910199551A CN101729943B CN 101729943 B CN101729943 B CN 101729943B CN 2009101995514 A CN2009101995514 A CN 2009101995514A CN 200910199551 A CN200910199551 A CN 200910199551A CN 101729943 B CN101729943 B CN 101729943B
- Authority
- CN
- China
- Prior art keywords
- wavelength
- optical
- optical network
- waveguide grating
- wavestrip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Optical Communication System (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
Abstract
The invention relates to a system and a method for using a wavelength division multiplex passive optical network to realize sharing of downlink wavelengths. In the system, an optical line terminal is connected with a remote node, and the remote node is connected with n optical network units, wherein n is a natural number that is greater than 2. A high-power laser, a photovoltaic converter, a switch driving circuit, an optical switch and the like applied in the optical line terminal and the remote node not only realize the sharing of the downlink wavelengths but also keep the advanced characteristics of the passive network. Based on the system, the invention uses an application-dispatching sharing model to realize the wavelength sharing of downlink optical network units. The invention has the characteristics that wavelengths and routes can be reconstructed as required, the utilization ratio of wavelength resources are high, the cost of network creation is low, and the like.
Description
Technical field
The present invention relates to optical communication field, specifically relate to a kind of WDM passive optical network system and method that realizes that the down direction wavelength is shared based on photovoltage conversion and wavelength path reconstruct.
Background technology
Advantages such as Wave division multiplexing passive optical network is good because of its exclusive Information Security, and bandwidth resources are very abundant and extensively thought the evolution direction of next generation ultra wide band Access Network by industry.WDM passive optical network system now adopts the static allocation mode of each ONU corresponding to a wavelength more; Because the cost of single wavelength laser is too high; This method of salary distribution will not only cause user average cost to rise, and make that the utilance of system's medium wavelength resource is lower.The Wave division multiplexing passive optical network that wavelength is shared does not distribute corresponding wavelength for each ONU; But all ONU share the wavelength resource of some; The introducing of wavelength sharing mode will reduce user average cost, promote the utilance of wavelength resource and alleviate the nervous pressure of following wave band resource.Therefore, the present invention will play a key effect in the process that Wave division multiplexing passive optical network is popularized in a large number.
At present, realize that in Wave division multiplexing passive optical network the method that wavelength is shared is applied to up direction more, i.e. the direction of user side to central office.This thinking follows from Ethernet passive optical network, and is not suitable for Wave division multiplexing passive optical network.This is because in Wave division multiplexing passive optical network, and down direction information transmitted amount is ten times of up direction often.Therefore, realize the shared realistic meaning that has more of wavelength of Wave division multiplexing passive optical network at down direction.In addition, the wavelength shared system that proposes at present adopts the core distributing equipment of waveguide array grating as far-end node place, however the output port of AWG fix, therefore be difficult to realize freely sharing of each downstream wavelength.Can solve the problem that wavelength is shared though dispose a plurality of wavelength shifters at far-end node place, cost is too high, has run counter to the original intention of wavelength sharing mode reduction system cost.The existence of above problem has increased the realization difficulty that low-cost Wave division multiplexing passive optical network down direction wavelength is shared.
Summary of the invention
The system and method that the objective of the invention is to overcome the shortcoming of prior art in the above-mentioned argumentation and provide a kind of Wave division multiplexing passive optical network realization down direction wavelength to share.Design of the present invention is: in order to achieve the above object, system is not used for transfer of data for each optical network unit distributes certain wavelengths, but all optical network units are shared the wavelength resource of some.System adopts optical network unit to send application, and optical line terminal is shared agreement according to certain wavelengths and distributed the mode of wavelength to realize that the down direction wavelength is shared.Through reducing the number of optical sender in the optical line terminal and deposit transmitter thereof with upper type, thereby overcome problem such as the low and user average cost height of existing Wave division multiplexing passive optical network resource utilization.
According to the foregoing invention design, the present invention uses following technical scheme:
A kind of Wave division multiplexing passive optical network is realized the system that the down direction wavelength is shared, and be connected through feed fiber with the far-end node by optical line terminal, and the far-end node is connected through profile fiber with optical network unit and constitutes.It is characterized in that: optical line terminal is by n fixed receiver; One first waveguide grating router, a wavestrip demodulation multiplexer, n dynamic adjustable receiver; A superpower laser; A wavestrip multiplexer, a central scheduler and a multifrequency laser are formed, and n is the natural number greater than 2.Wherein, n fixed receiver is connected with the 1-n port of first waveguide grating router respectively, n dynamic adjustable receiver then respectively with 2 of first waveguide grating router
*-(n+1)
*Port is connected.Central scheduler is connected with n fixed receiver array bottom and multifrequency laser simultaneously.1 of 1 port of wavestrip demodulation multiplexer and first waveguide grating router
*Port is connected, and 2 ports of wavestrip demodulation multiplexer are connected with the n+1 port of first waveguide grating router.1 port of wavestrip multiplexer is connected with superpower laser, and 2 ports of wavestrip multiplexer are connected with the right-hand member of multifrequency laser.Optical line terminal is through wherein 3 ports of wavestrip demodulation multiplexer and 3 ports of wavestrip multiplexer are realized being connected with the far-end node.
The said distal ends node is by a wavestrip multiplexer, a wavestrip demodulation multiplexer, an array waveguide grating, a photovoltage transducer, a switch driving circuit, one second waveguide grating router, a n
*The optical switch of n port and n and optical network unit two waveband demodulation multiplexer one to one constitute.1 port and 1 port of wavestrip demodulation multiplexer of distant-end node through being arranged in wavestrip multiplexer wherein realized respectively being connected with 3 ports of optical line terminal wavestrip demodulation multiplexer and 3 ports of wavestrip multiplexer.Simultaneously, optical switch and n the two waveband demodulation multiplexer realization of far-end node through wherein and n optical network unit is connected respectively.
Above-mentioned optical network unit ONU all has identical configuration, respectively by a light-emitting diode, and a coupler, an optical circulator, a reflective semiconductor optical amplifier, a 3dB power dispenser and a dynamic adjustable receiver constitute.Wherein, light-emitting diode is connected with coupler, and optical circulator is connected respectively with coupler, reflective semiconductor optical amplifier and 3dB power dispenser.The dynamic adjustable receiver is connected with 3dB power dispenser.The coupler of each ONU through wherein and the corresponding connection of two waveband demodulation multiplexer in the far-end node, simultaneously, each ONU also passes through 1 of optical switch in 3dB power dispenser and the far-end node
*-n
*Port links to each other respectively.
A kind of Wave division multiplexing passive optical network is realized the method that the down direction wavelength is shared; Adopt said system to carry out sharing of wavelength resource; It is characterized in that: when needs carry out the wavelength resource application; Each optical network unit loads up wavelength application information through L-band light-emitting diode wherein, and the array waveguide grating through far-end node place carries out after frequency spectrum cuts apart, and the wavelength application signal of different optical network units closes the road and in feed fiber, is sent to optical line terminal.The wavelength application signal of each optical network unit through the first waveguide grating router demultiplexing after, receive respectively by the fixed receiver array of the first waveguide grating router left end wavelength application information each optical network unit.
The central scheduler at optical line terminal place will gather and analyze the wavelength application information that receives, and the output that protocol dynamic is controlled multifrequency laser is shared according to predefined wavelength in the back, to satisfy the actual demand of optical network unit to wavelength.The multi-wavelength C-band downstream signal of multifrequency laser output is sent to the far-end node, carries out demultiplexing by second waveguide grating router.Different wave length downstream signal behind the demultiplexing is input to the corresponding fixed port of optical switch left end successively.Disposed n in this two dimension optical switch
*N micro-reflector has n input port and n output port.Can realize that through the on off state of dynamic each micro mirror of control any input wavelength exports from any output port.The downlink optical signal of different wave length can be through 1 after the optical switch routing
*-n
*Port arrives the ONU place of corresponding proposition wavelength application.For the passive characteristic that keeps distant-end node herein and be optical switch supply electric energy, system has used a superpower laser that wavelength is 1480nm in optical line terminal.The multi-wavelength signals of wavelength signals that this laser sends and multifrequency laser output is undertaken multiplexing in optical line terminal by a wavestrip multiplexer, after feed fiber transfers to the distant-end node place, carry out demultiplexing by the wavestrip demodulation multiplexer in the distant-end node.The entrained energy of the light signal that this high power laser sends changes electric energy into by the photovoltage transducer, the work of the controlling electric energy optical switch after the switch driving circuit utilization conversion.Only it is pointed out that at wavelength needs electric energy from the moment that an optical network unit is dispatched to another optical network unit, and wavelength connect and during service corresponding micro mirror state will remain unchanged.Remove the moment of wavelength path reconstruct like this, distant-end node will maintain passive states.
When descending wavelength signals arrives optical network unit, the 3dB power dispenser in the optical network unit will be divided into two parts to the power averaging of downstream signal: a part is received by dynamic adjustable receiver wherein; Another part arrives reflective semiconductor optical amplifier through optical circulator.Here; Light source in the optical network unit adopts the ring of light to return mode; The blank parts modulation upstream data information that reflective semiconductor optical amplifier is reserved at downstream signal, these upstream data message transmission to far-end nodes are also undertaken multiplexing by wherein second waveguide grating router.For thereby the quantity of feed fiber in the minimizing system makes this system more tally with the actual situation, at the distant-end node place, the up wavelength letter of application of the upstream data. signals of C-band and L-band number will be undertaken multiplexing by a wavestrip multiplexer.The signal of two wavestrips after multiplexing transfers to optical line terminal through the feed fiber of 20km; After wherein wavestrip demodulation multiplexer carries out the demultiplexing of different wavestrips; The upstream data. signals of C-band is through the first waveguide grating router demultiplexing, and received by the dynamic adjustable array acceptor on its right side.When the optical network unit sign off need carry out wavelength release, will load up wavelength through light-emitting diode equally and discharge information.After optical line terminal is received wavelength release information,, central scheduler accomplishes whole " application---connections---release " communication process thereby will stopping the emission of corresponding wavelength in the multifrequency laser.Wavelength after the release will be distributed by the next ONU that waits in line to serve and then realized that wave cycle is shared.
Compared with prior art, unique advantage of the present invention and conspicuousness characteristic are: (1) has realized really that through the effective configuration to optical network unit, far-end node and optical line terminal all ONU share and wavelength path reconstruct at the wavelength of down direction; (2) through optical line terminal place configuration superpower laser and at far-end node place the mode of configuration photovoltage transducer and switch driving circuit; Both solve the powerup issue of optical switch in the far-end node, kept the sourceless characteristic of far-end node and whole network again; (3) through in optical line terminal and far-end node, disposing two pairs of wavestrip multiplexers and wavestrip demodulation multiplexer respectively, the feeder line number of fibers in the system can be reduced to two, thereby has reduced the system constructing cost, makes it to correspond to actual needs more.
Description of drawings
Fig. 1 realizes the block diagram of down direction wavelength shared system for Wave division multiplexing passive optical network of the present invention.
Embodiment
Accompanying drawings, the preferred embodiments of the present invention are following: (comprising device number)
Embodiment one: Wave division multiplexing passive optical network is realized the system that the down direction wavelength is shared, and comprises 1 optical line terminal (22), 1 far-end node (23) and 32 optical network unit (24) three parts (n=32).Optical line terminal (22) is by 32 fixed receivers (9); 1 first waveguide grating router (8); 1 wavestrip demodulation multiplexer (7), 32 dynamic adjustable receivers (18), 1 superpower laser (19); 1 wavestrip multiplexer (5), 1 central scheduler (10) and a multifrequency laser (11) interconnect composition.Far-end node (23) is by 1 wavestrip multiplexer (5), 1 wavestrip demodulation multiplexer (7), 1 array waveguide grating (4), 1 photovoltage transducer (20), 1 switch driving circuit (21), 1 second waveguide grating router (12), 1 32
*The optical switch of 32 ports (13) and 32 two waveband demodulation multiplexers (3) are formed.Optical network unit (24) is by 1 light-emitting diode (1), 1 coupler (2), and 1 optical circulator (16), 1 reflective semiconductor optical amplifier (17), 1 3dB power dispenser (14) and 1 dynamic adjustable receiver (15) are formed.3 ports of 3 ports of wavestrip demodulation multiplexer (7) and wavestrip multiplexer (5) are realized being connected with 1 port of the middle wavestrip multiplexer (5) of far-end node (23) and 1 port of wavestrip demodulation multiplexer (7) through 2 20 kilometers feed fiber (6) respectively in the optical line terminal (22); 1 of 32 two waveband demodulation multiplexers (3) in the far-end node (23) and optical switch (13)
*-32
*Output port realize respectively with 32 optical network units (24) in coupler (2) be connected with optical circulator (16).More than connect and compose system as shown in Figure 1.
Embodiment two: adopt said system; Realize the concrete grammar that network down direction wavelength is shared: when optical network unit (24) need carry out downstream wavelength when sharing; To load up wavelength application information through L-band light-emitting diode (1) wherein; The array waveguide grating (4) that the wavelength application information of different optical network units is located through far-end node (23) carries out closing the road and in feed fiber (6), being sent to optical line terminal (22) after frequency spectrum cuts apart.The wavelength application signal of each optical network unit (24) through first waveguide grating router (8) demultiplexing after, receive respectively by the fixed receiver array (9) of the first waveguide grating router left end.The central scheduler at optical line terminal place (10) will gather and analyze the wavelength application information that receives, and the output that protocol dynamic is controlled multifrequency laser (11) is shared according to predefined wavelength in the back, to satisfy the actual demand of optical network unit to wavelength.The multi-wavelength C-band downstream signal of multifrequency laser output is sent to far-end node (23), carries out demultiplexing by second waveguide grating router (12).Different wave length downstream signal behind the demultiplexing is input to the corresponding fixed port of optical switch (13) left end successively.After downstream wavelength is changed through the inner wavelength path of optical switch, by 1 of optical switch below
*-32
*Port is dynamically exported.When descending wavelength arrives optical network unit, the 3dB power dispenser (14) in the optical network unit will be divided into two parts to the power averaging of downstream wavelength signal: a part is received by the dynamic adjustable receiver (15) in the optical network unit; Another part arrives reflective semiconductor optical amplifier (17) through optical circulator (16).Reflective semiconductor optical amplifier will load the uplink information that optical network unit need transmit, and these upstream datas still are on the former downstream wavelength.The uplink information of each optical network unit transfers to far-end node (23) and is undertaken multiplexing by wherein second waveguide grating router (12).33 ports of first waveguide grating router (8) in upstream data message transmission to the optical line terminal (22) after multiplexing; Behind this waveguide grating router demultiplexing, receive respectively by 32 dynamic adjustable receivers (18) of the first waveguide grating router right-hand member.
Claims (2)
1. a Wave division multiplexing passive optical network is realized the system that the down direction wavelength is shared; Be connected through feed fiber (6) with far-end node (23) by optical line terminal (22); And far-end node (23) is connected through profile fiber with optical network unit (24) and constitutes, and it is characterized in that:
A. said optical line terminal (22) is made up of n fixed receiver (9), 1 first waveguide grating router (8), 1 the first wavestrip demodulation multiplexer (7), a n dynamic adjustable receiver (18), 1 superpower laser (19), 1 the first wavestrip multiplexer (5), 1 central scheduler (10) and a multifrequency laser (11); N is the natural number greater than 2; Wherein, N fixed receiver (9) is connected with No. 1-n port of first waveguide grating router (8) respectively, n dynamic adjustable receiver (18) then respectively with No. 2 of first waveguide grating router (8)-(n+1) number port is connected; Central scheduler (10) is connected with n fixed receiver (9) array bottom and multifrequency laser (11) simultaneously; 1 port of the first wavestrip demodulation multiplexer (7) is connected with No. 1 port of first waveguide grating router (8), and 2 ports of the first wavestrip demodulation multiplexer (7) are connected with (n+1) number port of first waveguide grating router; 1 port of the first wavestrip multiplexer (5) is connected with superpower laser (19), and 2 ports of the first wavestrip multiplexer (5) are connected with the right-hand member of multifrequency laser (11); Optical line terminal (22) is through wherein 3 ports of the first wavestrip demodulation multiplexer (7) and 3 ports of wavestrip multiplexer (5) are realized being connected with far-end node (23);
B. said far-end node (23) is by 1 second wavestrip multiplexer (26); 1 second wavestrip demodulation multiplexer (25); 1 array waveguide grating (4); 1 photovoltage transducer (20); 1 switch driving circuit (21), 1 second waveguide grating router (12), the optical switch (13) of 1 n
n port and n two waveband demodulation multiplexer (3) are formed; 1 port and 1 port of second wavestrip demodulation multiplexer (25) of far-end node (23) through being arranged in the second wavestrip multiplexer (26) wherein realized respectively being connected with 3 ports of far-end node (23) second wavestrip demodulation multiplexers (25) and 3 ports of the second wavestrip multiplexer (26); Simultaneously, optical switch (13) and n two waveband demodulation multiplexer (3) realization of far-end node (23) through wherein and n optical network unit (24) is connected respectively;
C. each optical network unit (24) is by 1 light-emitting diode (1); 1 coupler (2); 1 optical circulator (16), 1 reflective semiconductor optical amplifier (17), 1 3dB power dispenser (14) and 1 dynamic adjustable receiver (15) are formed; Wherein, light-emitting diode (1) is connected with coupler (2), and optical circulator (16) is connected respectively with coupler (2), reflective semiconductor optical amplifier (17) and 3dB power dispenser (14); Dynamic adjustable receiver (15) is connected with 3dB power dispenser (14); The corresponding connection of two waveband demodulation multiplexer (3) in the coupler (2) of each optical network unit (24) through wherein and the far-end node (23); Simultaneously, each optical network unit (24) also links to each other respectively through No. 1-n port of optical switch (13) in 3dB power dispenser (14) and the far-end node.
2. a Wave division multiplexing passive optical network is realized the method that the down direction wavelength is shared; The system that adopts the described Wave division multiplexing passive optical network of claim 1 to realize that the down direction wavelength is shared carries out the wavelength down direction and shares; It is characterized in that: when optical network unit (24) need carry out downstream wavelength when sharing; To load up wavelength application information through L-band light-emitting diode (1) wherein; The array waveguide grating (4) that the wavelength application information of different optical network units is located through far-end node (23) carries out closing the road and in feed fiber (6), being sent to optical line terminal (22) after frequency spectrum cuts apart; The wavelength application signal of each optical network unit (24) through first waveguide grating router (8) demultiplexing after, receive respectively by the fixed receiver (9) of the first waveguide grating router left end; The central scheduler at optical line terminal place (10) will gather and analyze the wavelength application information that receives, and the output that protocol dynamic is controlled multifrequency laser (11) is shared according to predefined wavelength in the back, to satisfy the actual demand of optical network unit to wavelength; The multi-wavelength C-band downstream signal of multifrequency laser output is sent to the far-end node, carries out demultiplexing by second waveguide grating router (12); Different wave length downstream signal behind the demultiplexing is input to the corresponding fixed port of optical switch (13) left end successively; Downstream wavelength is dynamically exported by No. 1-n port of optical switch below after changing through the inner wavelength path of optical switch; When descending wavelength arrives optical network unit, the 3dB power dispenser (14) in the optical network unit will be divided into two parts to the power averaging of downstream wavelength signal: a part is received by the dynamic adjustable receiver (15) in the optical network unit; Another part arrives reflective semiconductor optical amplifier (17) through optical circulator (16); Reflective semiconductor optical amplifier will load the uplink information that optical network unit need transmit, and these upstream datas still are on the former downstream wavelength; The uplink information of each optical network unit transfers to far-end node (23) and is undertaken multiplexing by wherein second waveguide grating router (12); (n+1) number port of first waveguide grating router (8) in upstream data message transmission to the optical line terminal (22) after multiplexing; Behind this waveguide grating router demultiplexing, receive respectively by n the dynamic adjustable receiver (18) of the first waveguide grating router right-hand member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101995514A CN101729943B (en) | 2009-11-26 | 2009-11-26 | System and method for using wavelength division multiplex passive optical network to realize sharing of downlink wavelength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101995514A CN101729943B (en) | 2009-11-26 | 2009-11-26 | System and method for using wavelength division multiplex passive optical network to realize sharing of downlink wavelength |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101729943A CN101729943A (en) | 2010-06-09 |
| CN101729943B true CN101729943B (en) | 2012-10-31 |
Family
ID=42449996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101995514A Expired - Fee Related CN101729943B (en) | 2009-11-26 | 2009-11-26 | System and method for using wavelength division multiplex passive optical network to realize sharing of downlink wavelength |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101729943B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115378505A (en) * | 2022-08-23 | 2022-11-22 | 重庆邮电大学 | Multi-mode optical fiber turbulence-resistant free space optical communication system, device and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008034378A1 (en) * | 2006-08-28 | 2008-03-27 | Huawei Technologies Co., Ltd. | A wave division multiplexing optical access transmission system, method and device |
| CN101262299A (en) * | 2008-04-24 | 2008-09-10 | 上海交通大学 | Wave-division multiplexing passive optical network system for supporting multicast function |
-
2009
- 2009-11-26 CN CN2009101995514A patent/CN101729943B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008034378A1 (en) * | 2006-08-28 | 2008-03-27 | Huawei Technologies Co., Ltd. | A wave division multiplexing optical access transmission system, method and device |
| CN101262299A (en) * | 2008-04-24 | 2008-09-10 | 上海交通大学 | Wave-division multiplexing passive optical network system for supporting multicast function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101729943A (en) | 2010-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8554079B2 (en) | Wavelength division and time division multiplex mixing passive optical network system, terminal and signal transmission method | |
| CN101197638B (en) | hybrid passive optical network system | |
| CN109560891B (en) | Method and device for realizing wavelength division multiplexing optical signal shunting | |
| CN106304419B (en) | Wireless forward transmission system for digital optical transmission based on multi-core optical fiber | |
| US9264169B2 (en) | Method for the adaptive configuration of the transmission spectrum in WDM-PONs | |
| CN108092734B (en) | Electric power data transmission device, system and detection method | |
| CN101848054A (en) | System and method for leading wavelength division multiplexing passive optical network to realize broadcast function with self-healing function | |
| TWI513207B (en) | A remote node device, an optical network unit, a system and a communication method thereof | |
| CN101521836B (en) | System and method for online updating of bandwidth of optical network unit in wavelength division multiplexing optical access network | |
| US7639949B2 (en) | TDM PON and dynamic bandwidth allocation method thereof | |
| Li et al. | Dual-fiber-ring architecture supporting discretionary peer-to-peer intra-communication and bidirectional inter-communication in metro-access network | |
| CN101729943B (en) | System and method for using wavelength division multiplex passive optical network to realize sharing of downlink wavelength | |
| CN202004922U (en) | Passive optical network system on wavelength division multiplexing | |
| CN100488083C (en) | Service scheduling device in optical communication network and method thereof | |
| Garg et al. | Resilient, bandwidth scalable and energy efficient hybrid PON architecture | |
| CN101188470A (en) | Uplink and downlink wavelength distribution and management method based on rough wave division multiple address FTTH technology | |
| CN105307057A (en) | Device for supporting ONU inter-station communication in PON system | |
| CN107911190B (en) | A kind of optical line terminal for supporting ultra dense wavelength division multiple | |
| Sachdeva et al. | Energy efficient hybrid WDM-TDM passive optical networks with access-load difference between ONUs using FBGs, SOA and DWS | |
| CN201114072Y (en) | Novel wired network system | |
| CN101374022A (en) | Novel wired network system | |
| JP7524938B2 (en) | CONTROL DEVICE, CONTROL METHOD, CONTROL PROGRAM, AND OPTICAL COMMUNICATION SYSTEM | |
| Goyal et al. | A novel design of energy efficient bidirectional passive optical green networks using reduced buffer with small packet size technique | |
| Shen et al. | Experimental demonstration of reconfigurable long-reach ultraflow access: software-defined dual-mode networks | |
| Zhao et al. | Hybrid WDM-TDM PON enabled by TWC based switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121031 Termination date: 20151126 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |