CN101729942B - System and method for using wavelength division multiplex passive optical network to realize ring local area network - Google Patents
System and method for using wavelength division multiplex passive optical network to realize ring local area network Download PDFInfo
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- CN101729942B CN101729942B CN200910199550XA CN200910199550A CN101729942B CN 101729942 B CN101729942 B CN 101729942B CN 200910199550X A CN200910199550X A CN 200910199550XA CN 200910199550 A CN200910199550 A CN 200910199550A CN 101729942 B CN101729942 B CN 101729942B
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Abstract
The invention relates to a system and a method for using a wavelength division multiplex passive optical network to realize a ring local area network. In the system, an optical line terminal OLT is connected with a remote node RN through a feeding mode, and the remote node RN is connected with a plurality of optical network units ONU. The system comprises N wavelengths and N optical network units ONU, wherein N is a natural number except zero, all the optical network units ONU share one wavelength, and the wavelength of signals of the local area network and the wavelength of point-to-point signals are on different wave bands. The method adopts the system to realize the local area network with a ring logical structure, the OLT transmits the signals of the local area network to the RN, the signals of the local area network are transmitted to all the ONU in turn to be received and modulated through an N+3 port optical ring inside the RN, and finally returned to the OLT, thereby realizing the logically ring local area network, establishing direct connection among the ONU, and greatly improving the communication efficiency among the ONU.
Description
Technical field
The present invention relates to optical communication field, specifically relate to a kind of Wave division multiplexing passive optical network WDM passive optical network system and method that realizes annular local area network (LAN).
Background technology
The Wave division multiplexing passive optical network Wave division multiplexing passive optical network technology bandwidth of can under the situation that does not change physical basis equipment, upgrading significantly promotes the transmission capacity of network, in the middle of optical access network, gathers around to have broad application prospects.And be to use very general type in all kinds of Wave division multiplexing passive optical network WDM passive optical network systems based on the Wave division multiplexing passive optical network WDM passive optical network system that the ring of light returns; Also more this type of employing of present Wave division multiplexing passive optical network WDM passive optical network system, so the present invention has important effect in the Wave division multiplexing passive optical network WDM passive optical network system.
The network configuration of conventional optical loop echo division multiplexing passive optical network is tree-like often; Realized virtual point-to-point the connection between each optical network unit ONU and the optical line terminal OLT, this make between each optical network unit ONU and the optical line terminal OLT communicate by letter safer and efficient.Yet this structure makes that but the Communication Realization between optical network unit ONU and the optical network unit ONU is comparatively difficult.Though can between each optical network unit ONU, set up a local area network (LAN) through the mode that each optical network unit ONU and optical line terminal OLT connect.But because this connection is a kind of indirect connection; Each optical network unit ONU needs to communicate with optical line terminal OLT earlier; And then communicate through optical line terminal OLT and target optical network unit ONU, therefore, this communication mode need take the point-to-point bandwidth of two optical network unit ONU simultaneously; Its efficient is very low, but also has strengthened the intractability of optical line terminal OLT.Present existing scheme all fails to solve the problem of each optical network unit ONU direct communication, that is: in a local area network (LAN), connect for setting up directly between each optical network unit ONU, enables direct communication.
Summary of the invention
The objective of the invention is to defective, provide a kind of Wave division multiplexing passive optical network to realize annular LAN system and method to the prior art existence.
In order to achieve the above object, design of the present invention is: in tree-like Wave division multiplexing passive optical network, set up the local area network (LAN) of a logical construction for annular.All optical network unit ONU have been comprised in this local area network (LAN); Thereby each optical network unit ONU all can be set up with its target optical network unit ONU through this annular local area network (LAN) and directly be connected; Thereby it is underground to have overcome in the conventional scheme between the optical network unit ONU communication efficiency, and must take the problem of the point-to-point bandwidth of optical network unit ONU of respectively communicating by letter.
In order to address the above problem, the present invention has been local area network (LAN) specific assigned wavelength, this wavelength is in different wave bands with point-to-point wavelength.Therefore, the local area network signal of each optical network unit ONU needn't take point-to-point bandwidth, and can be through a relatively inexpensive Coarse Wave Division Multiplexer with local area network signal and point-to-point Signal Separation.In addition, set up the optical circulator of a multiport at distant-end node RN place, make local area network signal to be annular local area network (LAN) thereby between each optical network unit ONU, set up a logical construction successively through optical line terminal OLT and each optical network unit ONU.Thus, each optical network unit ONU all can directly be connected through setting up between this annular local area network (LAN) and the target optical network unit ONU, reaches the purpose of communication efficiency between the raising optical network unit ONU.
According to the foregoing invention design, the present invention adopts following technical proposals:
A kind of Wave division multiplexing passive optical network is realized annular LAN system; By optical line terminal OLT, distant-end node RN and optical network unit ONU constitute, wherein; Optical line terminal OLT is connected with distant-end node RN through feed fiber, and optical network unit ONU then is connected with distant-end node RN through profile fiber.Total N the wavelength of system and N optical network unit ONU, N is the natural number except that zero, each optical network unit ONU exclusively enjoys a wavelength, wherein, the wavelength of local area network signal and the wavelength of point-to-point signal is in different-waveband.It is characterized in that: said optical line terminal OLT is by N point-to-point transmitter, a N point-to-point receiver, 1 local area network (LAN) transmitter; 1 local area network (LAN) receiver; 2 N port first array waveguide grating AWG, 2 first Coarse Wave Division Multiplexer CWDM and 13 port photocirculator constitute; Said array waveguide grating AWG demultiplexing end links to each other with said point-to-point transmitter; Its multiplexing end links to each other with said Coarse Wave Division Multiplexer CWDM demultiplexing end; And another multiplexing end of Coarse Wave Division Multiplexer CWDM links to each other with the local area network (LAN) transmitter, and its multiplexing end then links to each other with said optical circulator port one, and said array waveguide grating AWG demultiplexing end links to each other with said point-to-point receiver; Its multiplexing end links to each other with said Coarse Wave Division Multiplexer CWDM demultiplexing end; And another multiplexing end of Coarse Wave Division Multiplexer CWDM links to each other with the local area network (LAN) receiver, and its multiplexing end then links to each other with said optical circulator port 3, and optical circulator port 2 links to each other with feed fiber.
The said distal ends node RN is by 1 second Coarse Wave Division Multiplexer CWDM, 1 second array waveguide grating AWG, and 1 N+3 port photocirculator and N the 3rd Coarse Wave Division Multiplexer CWDM constitute; Said N+3 port photocirculator port one is connected with port N+3; The multiplexing end of the said second Coarse Wave Division Multiplexer CWDM with present light and be connected; The demultiplexing end is connected with N+3 port photocirculator port 2 with the multiplexing end of the said second array waveguide grating AWG respectively; Said the 3rd Coarse Wave Division Multiplexer CWDM demultiplexing end is connected with N+3 port photocirculator port 3 to port N+2 with the second array waveguide grating AWG demultiplexing end respectively, and its multiplexing end is connected with profile fiber.
Above-mentioned optical network unit ONU is by 1 the 4th Coarse Wave Division Multiplexer CWDM; 2 couplers; 1 point-to-point reflective semiconductor optical amplifier RSOA, 1 point-to-point receiver, 1 local area network (LAN) reflective semiconductor optical amplifier RSOA and 1 local area network (LAN) receiver constitute; The multiplexing end of said the 4th Coarse Wave Division Multiplexer CWDM is connected with profile fiber; The demultiplexing end is connected with the multiplexing end of said coupler respectively; Coupler demultiplexing end links to each other with point-to-point receiver with said point-to-point reflective semiconductor optical amplifier RSOA respectively, and coupler demultiplexing end links to each other with the local area network (LAN) receiver with local area network (LAN) reflective semiconductor optical amplifier RSOA respectively.
This Wave division multiplexing passive optical network is realized annular LAN system local area network signal transmission method: adopt said system to transmit; It is characterized in that: send signal by the local area network (LAN) transmitter; After closing ripple through the first Coarse Wave Division Multiplexer CWDM and descending point-to-point signal; Injected feed fiber and be sent to distant-end node RN by optical circulator, in distant-end node RN, local area network signal is through the second Coarse Wave Division Multiplexer CWDM and descending point-to-point signal partial wave and be sent to the N+3 ports light rings; By the N+3 port photocirculator with signal be sent to successively each optical network unit ONU receive with modulation again after; Close ripple through the second Coarse Wave Division Multiplexer CWDM and point-to-point upward signal, be injected into feed fiber subsequently and be back in the optical line terminal OLT, in optical line terminal OLT; Local area network signal passes through another first Coarse Wave Division Multiplexer CWDM and up point-to-point signal partial wave, and is sent to the reception of local area network (LAN) receiver.
The present invention compared with prior art; Have following conspicuous outstanding substantive distinguishing features and remarkable advantage: the local area network (LAN) of logical construction for annular set up in (1) in tree row WDM passive optical network system, also make and realized direct communication in the system between each optical network unit ONU; (2) required optical network unit optical network unit ONU need not built-in expensive mode-locked laser in the system, so its cost is cheaper, has also further reduced network cost simultaneously; (3) network is lower for the requirement of device, and is easy to implement.
Description of drawings
Fig. 1 realizes the system architecture diagram of annular local area network (LAN) for one embodiment of the invention card Wave division multiplexing passive optical network.
Embodiment
The preferred embodiments of the present invention accompanying drawings is following:
Embodiment one: referring to Fig. 1; This Wave division multiplexing passive optical network realizes that annular LAN system is by optical line terminal OLT (1); Distant-end node RN (2) and optical network unit ONU (3) constitute; Wherein, optical line terminal OLT (1) is connected with distant-end node RN (2) through feed fiber (4), and optical network unit ONU (3) then is connected with distant-end node RN (2) through profile fiber.Total N wavelength of system and N optical network unit ONU (3), N is the natural number except that zero, each optical network unit ONU (3) exclusively enjoys a wavelength, wherein, the wavelength of local area network signal and the wavelength of point-to-point signal is in different-waveband.Referring to Fig. 1; The optical line terminal OLT of said system (1) is by N point-to-point transmitter (5), a N point-to-point receiver (6), 1 local area network (LAN) transmitter (7); 1 local area network (LAN) receiver (8), 2 N port first array waveguide grating AWG (9,10); 2 first Coarse Wave Division Multiplexer CWDM (11,12) and 13 port photocirculator (14) constitute.After local area network signal is sent by local area network (LAN) transmitter (7); Spread out of optical line terminal OLT (1) through the first Coarse Wave Division Multiplexer CWDM (11) with optical circulator (14) successively, the local area network signal that is sent to optical line terminal OLT (1) then is sent to local area network (LAN) receiver (8) through optical circulator (1) and another first Coarse Wave Division Multiplexer CWDM (12) successively and receives.
Referring to Fig. 1, the distant-end node RN (2) of said system is by 1 second Coarse Wave Division Multiplexer CWDM (13), 1 second array waveguide grating AWG (15), and 1 N+3 port photocirculator (16) and N the 3rd Coarse Wave Division Multiplexer CWDM (17) constitutes.The local area network signal that is sent to distant-end node RN (2) sends and is sent to N+3 port photocirculator (16) through the second Coarse Wave Division Multiplexer CWDM (13); Then; By N+3 port photocirculator (16) signal being sent to each optical network unit ONU (3) successively receives and revises; After signal returns to optical circulator (16) by last optical network unit ONU (3), will send it back in the middle of the optical line terminal OLT (1) through the second Coarse Wave Division Multiplexer CWDM (13).
Referring to Fig. 1; The optical network unit ONU of said system (3) is by 1 the 4th Coarse Wave Division Multiplexer CWDM (18); 2 couplers (19); 1 point-to-point reflective semiconductor optical amplifier RSOA (21), 1 point-to-point receiver (20), 1 local area network (LAN) reflective semiconductor optical amplifier RSOA (23) and 1 local area network (LAN) receiver (22) constitute.The local area network signal that is sent to optical network unit ONU (3) sends optical coupler (19) to through the 4th Coarse Wave Division Multiplexer CWDM (18); And be divided into two parts by coupler (19): a part is sent to local area network (LAN) receiver (22) and receives, and another part is sent to local area network (LAN) reflective semiconductor optical amplifier RSOA (23) and amplifies with modulation again and be back to distant-end node RN (2) through coupler (19) and Coarse Wave Division Multiplexer CWDM (18) successively.
Referring to Fig. 1; This Wave division multiplexing passive optical network is realized annular LAN system local area network signal transmission method: above-mentioned Wave division multiplexing passive optical network is realized annular LAN system; Send local area network signal by local area network (LAN) transmitter (7); After closing ripple through the first Coarse Wave Division Multiplexer CWDM (11) and descending point-to-point signal; Injected feed fiber (4) and be sent to distant-end node RN (2) by optical circulator (14), in distant-end node RN (2), local area network signal is through the second Coarse Wave Division Multiplexer CWDM (13) and descending point-to-point signal partial wave and be sent in the N+3 port photocirculator (16); By N+3 port photocirculator (16) with signal be sent to successively each optical network unit ONU (3) receive with modulation again after; Close ripple through the second Coarse Wave Division Multiplexer CWDM (13) with point-to-point upward signal, be injected into feed fiber (4) subsequently and be back in the optical line terminal OLT (1), in optical line terminal OLT (1); Local area network signal passes through another first Coarse Wave Division Multiplexer CWDM (12) and up point-to-point signal partial wave, and is sent to local area network (LAN) receiver (8) reception.
Claims (2)
1. a Wave division multiplexing passive optical network is realized annular LAN system; By optical line terminal OLT (1); Distant-end node RN (2) and optical network unit ONU (3) constitute; Wherein, optical line terminal OLT (1) is connected with distant-end node RN (2) through feed fiber (4), and optical network unit ONU (3) then is connected with distant-end node RN (2) through profile fiber; Total N wavelength of system and N optical network unit ONU (3), N is the natural number except that zero, each optical network unit ONU (3) exclusively enjoys a wavelength, wherein, the wavelength of local area network signal and the wavelength of point-to-point signal is in different-waveband; It is characterized in that: said optical line terminal OLT (1) is by N point-to-point transmitter (5), a N point-to-point receiver (6), 1 local area network (LAN) transmitter (7); 1 local area network (LAN) receiver (8); 2 N port first array waveguide grating AWG (9; 10), 2 first Coarse Wave Division Multiplexer CWDM (11,12) and 13 port photocirculator (14) constitute; Said first array waveguide grating AWG (9) the demultiplexing end links to each other with said point-to-point transmitter (5); Its multiplexing end links to each other with said first Coarse Wave Division Multiplexer CWDM (11) the demultiplexing end; And another demultiplexing end of the first Coarse Wave Division Multiplexer CWDM (11) links to each other with local area network (LAN) transmitter (7); Its multiplexing end then links to each other with said 3 port photocirculators (14) port one; Another first array waveguide grating AWG (10) demultiplexing end links to each other with said point-to-point receiver (6), and its multiplexing end links to each other with another first Coarse Wave Division Multiplexer CWDM (12) demultiplexing end, and another demultiplexing end of another first Coarse Wave Division Multiplexer CWDM (12) links to each other with local area network (LAN) receiver (8); Its multiplexing end then links to each other with said 3 port photocirculators (14) port 3, and 3 port photocirculators (14) port 2 links to each other with feed fiber (4); Said distant-end node RN (2) is by 1 second Coarse Wave Division Multiplexer CWDM (13), 1 second array waveguide grating AWG (15), and 1 N+3 port photocirculator (16) and N the 3rd Coarse Wave Division Multiplexer CWDM (17) constitutes; Said N+3 port photocirculator (16) port one is connected with port N+3; The multiplexing end of the said second Coarse Wave Division Multiplexer CWDM (13) is connected with feed fiber; The demultiplexing end is connected with N+3 port photocirculator (16) port 2 with the multiplexing end of the said second array waveguide grating AWG (15) respectively; The demultiplexing end of said N the 3rd Coarse Wave Division Multiplexer CWDM (17) is connected with second array waveguide grating AWG (15) the demultiplexing end respectively; Another demultiplexing end of said N the 3rd Coarse Wave Division Multiplexer CWDM (17) is connected with N+3 port photocirculator (16) port 3 to port N+2 respectively, and its multiplexing end is connected with profile fiber; Said optical network unit ONU (3) is by 1 the 4th Coarse Wave Division Multiplexer CWDM (18); 2 couplers (19); 1 point-to-point reflective semiconductor optical amplifier RSOA (21); 1 point-to-point receiver (20), 1 local area network (LAN) reflective semiconductor optical amplifier RSOA (23) and 1 local area network (LAN) receiver (22) constitute; The multiplexing end of said the 4th Coarse Wave Division Multiplexer CWDM (18) is connected with profile fiber; The demultiplexing end is connected with the multiplexing end of said coupler (19) respectively; A coupler (19) demultiplexing end links to each other with point-to-point receiver (20) with said point-to-point reflective semiconductor optical amplifier RSOA (21) respectively, and another coupler (19) demultiplexing end links to each other with local area network (LAN) receiver (22) with local area network (LAN) reflective semiconductor optical amplifier RSOA (23) respectively.
2. a Wave division multiplexing passive optical network is realized annular LAN system local area network signal transmission method: adopt Wave division multiplexing passive optical network according to claim 1 to realize that annular LAN system carries out the signal transmission; It is characterized in that: send local area network signal by local area network (LAN) transmitter (7); After closing ripple through the first Coarse Wave Division Multiplexer CWDM (11) and descending point-to-point signal; Inject feed fiber (4) and be sent to distant-end node RN (2) by 3 port photocirculators (14); In distant-end node RN (2); Local area network signal is through the second Coarse Wave Division Multiplexer CWDM (13) and descending point-to-point signal partial wave and be sent in the N+3 port photocirculator (16), by N+3 port photocirculator (16) with signal be sent to successively each optical network unit ONU (3) receive with modulation again after, close ripple through the second Coarse Wave Division Multiplexer CWDM (13) with point-to-point upward signal; Being injected into feed fiber (4) subsequently is back in the optical line terminal OLT (1); In optical line terminal OLT (1), local area network signal passes through another first Coarse Wave Division Multiplexer CWDM (12) and up point-to-point signal partial wave, and is sent to local area network (LAN) receiver (8) reception.
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| EP2573967B1 (en) * | 2011-09-26 | 2017-03-15 | NTT DoCoMo, Inc. | System for interconnecting nodes attached to a passive optical network |
| CN103139672B (en) * | 2013-02-01 | 2016-05-04 | 北京邮电大学 | In EPON, support the network coding method of wire and wireless hybird environment |
| CN104486028B (en) * | 2014-12-08 | 2018-05-01 | 上海大学 | The system and method for wavelength-division multiplex soft exchange net low cost LAN service transmission |
| CN105992075B (en) * | 2015-01-27 | 2019-12-24 | 上海诺基亚贝尔股份有限公司 | Method and device for supporting inter-station communication of ONU (optical network Unit) of PON (Passive optical network) system |
| FR3060248B1 (en) * | 2016-12-09 | 2019-03-15 | Safran Electrical & Power | OPTICAL RING OPERATED COMMUNICATION NETWORK FOR AIRCRAFT |
| CN106792283B (en) * | 2016-12-14 | 2019-08-16 | 电子科技大学 | A kind of optical access network system based on multilayer ring structure |
| CN117434664A (en) * | 2022-07-12 | 2024-01-23 | 中兴通讯股份有限公司 | Optical splitter, optical distribution network unit, and network system |
| CN117676391A (en) * | 2022-08-31 | 2024-03-08 | 华为技术有限公司 | Data transmission method, related equipment and system |
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