CN101741502A - System for implementing self-healing function for ring wave division multiplexing passive optical network and transmission method thereof - Google Patents
System for implementing self-healing function for ring wave division multiplexing passive optical network and transmission method thereof Download PDFInfo
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Abstract
The invention relates to a system for implementing self-healing function for a ring wave division multiplexing passive optical network and a transmission method thereof. The system is connected with an RN by an OLT through feed, and the RN is connected with a plurality of ONUs; and the system has N wavelengths and N ONUs, and each ONU independently shares one wavelength. The method adopts the system to realize the self-healing function of the network when the optical fiber is damaged; a downlink signal is divided into a working downlink wavelength and a protecting downlink wavelength at the RN, and the ONU transmits uplink and downlink signals through a distributed optical fiber link on one side under the normal condition; and when the distributed optical fiber is broken, the ONU behind a breaking point is automatically switched to a protective state and transmits the uplink and downlink signals through an undamaged link on the other side; therefore, through the mode, the self-healing function of the system is realized without increasing a protective distributed optical fiber and a special monitoring channel, and the cost of the system is greatly reduced.
Description
Technical field
The present invention relates to optical communication field, specifically relate to a kind of ring wave division multiplexing passive optical network network system and method for realizing self-healing function.
Background technology
EPON (WDM-PON) based on wavelength division multiplexing has big capacity, and advantages such as protocol transparency and smooth upgrade are considered to the important development direction of following high-speed access network.The WDM-PON system has all distributed one/a pair of independently wavelength transmission uplink and downlink signals for each optical network unit (ONU), so each ONU speed all can arrive 1.25Gbit/s, 2.5Gbit/s even higher.Under the transmission conditions of two-forty, the communicating interrupt that fibercuts causes causes enormous economic loss probably.Therefore, how effectively optical fiber to be protected one of important directions that has become WDM-PON research with the self-healing property that improves WDM-PON.
According to the difference of physical topological structure, WDM-PON can be divided into tree type and annular.That research is more at present is tree type WDM-PON, yet tree type WDM-PON itself does not have self-healing property.Though there is the part scholar to propose some solutions; but these schemes not only need be set up a large amount of optical fiber in legacy network; and the protection of its feed fiber and profile fiber is relevant often; that is: when the protection feed fiber is switched to user mode; part protects profile fiber also will be forced to switch to user mode, loses its original defencive function thus.Annular WDM-PON itself possesses good self-healing property, can satisfy the requirement of people to following Access Network " high survivability ", and its technology is full-fledged in the main line looped network.Yet in the present annular WDM-PON scheme of carrying, although adopted low-cost ONU light source, its system cost is still too high, is difficult to be applied in the middle of the reality.Its basic reason is, all ONU all need install the high optical add/drop multiplexer of price as wavelength selector in the network, thereby caused the significantly rising of entire system cost.Therefore, existing each scheme all can not solve self-cure type Wavelength division multiplexing-passive light net networking cost height at present, uses the big problem of amount of fibre.
Summary of the invention
The objective of the invention is to defective, the system and the transmission method thereof of the ring wave division multiplexing passive optical network network realization self-healing function of a kind of low cost, low optical fiber occupancy is provided at the prior art existence.
In order to achieve the above object; design of the present invention is: adopt single profile fiber to connect each ONU; under the normal operation; each ONU all uses the same side link to carry out the signal transmission; when fibercuts; be in each ONU after the breakaway poing and then automatically switch to the unspoiled link of opposite side and carry out the signal transmission, therefore the whole network profile fiber that do not need protection can be realized the self-healing function under the profile fiber damage condition, thereby has significantly reduced the optical fiber occupancy of whole system.In addition, ONU adopts the optical add/drop multiplexer of cheap F-P etalon rather than costliness as wavelength selector spare, makes the cost of all ONU and even whole system remain on lower level.
According to the foregoing invention design, the present invention adopts following technical proposals:
A kind of ring wave division is taken the system that EPON is realized self-healing function, 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 by feed fiber, and optical network unit ONU then is connected with distant-end node RN by profile fiber.System ONU number and wavelength number are N, each ONU use one independently wavelength communicate.It is characterized in that: described OLT is by N transmitter, N receiver, and 2 wavelength division multiplexers, 1 optical circulator and an optical switch constitute; Described wavelength division multiplexer demultiplexing end is connected with described transmitter; multiplexing end is connected with described optical circulator 1 port; described wavelength division multiplexer demultiplexing end is connected with described receiver; multiplexing end is connected with optical circulator 3 ports; optical circulator port 2 is connected with described optical switch, and all the other ports of optical switch are connected with the protection feed fiber with the work feed fiber respectively.
The said distal ends node RN is made of 1 coupler; 2 ports of coupler one end are connected with the protection feed fiber with the work feed fiber respectively, and 2 ports of the other end are connected with 2 ONU respectively.
Above-mentioned ONU is by 14 port photocirculator, 2 F-P etalons, and 1 2*2 optical switch, 1 coupler, 1 receiver, 1 SOA, 1 watch-dog and 1 isolator constitute; It is characterized in that: described optical circulator port one, 3 is connected with other ONU respectively, 2,4 ports are connected with two described F-P etalons respectively, 2 ports of described optical switch one end are connected with the F-P etalon respectively, the other end is connected with optical isolator with the multiplexing end of coupler respectively, wherein the circuit tap that is connected with the multiplexing end of coupler is to watch-dog, and by the monitoring of watch-dog enforcement to optical switch, the demultiplexing end of coupler is connected with SOA with receiver respectively, and the SOA other end is connected with optical isolator.
This Wave division multiplexing passive optical network is realized the transmission method of the system of self-healing function: adopt said system to transmit, it is characterized in that: each transmitter among the OLT sends downstream signal, and after closing ripple by wavelength division multiplexer, by optical circulator and optical switch injection work feed fiber, and be sent to RN by it; In RN, downstream signal is divided into two parts, and a part is transmitted along clockwise direction as the work downstream signal, and another part is as protection downstream signal, transmission in the counterclockwise direction; Under normal condition, each ONU all receives the work downstream signal and the shielding protection downstream signal, and the upward signal that is sent by each ONU then injects RN along the direction opposite with the work downstream signal, promptly makes uplink and downlink signals all by same link transmission; When profile fiber ruptures, being in breakaway poing ONU does not before damage owing to its link, so still be in normal condition, ONU behind the breakaway poing then automatically switches to guard mode because link damages, the ONU that is in guard mode receives the protection downstream signal, and with its upward signal by injecting RN with the opposite transmission direction of protection downstream signal, make that promptly the ONU that is in guard mode utilizes the unspoiled link of opposite side to carry out the transmission of uplink and downlink signals, thereby the system that makes has realized self-healing function; Uplink signal transmissions is to RN, and in work feed fiber transmission OLT, signal is transferred into the wavelength division multiplexer demultiplexing by optical switch and optical circulator successively subsequently, is sent to receiver at last and receives.
The method that above-mentioned link automaticallyes switch is: under normal mode, the signal that ONU I receives comprises the work downstream signal λ i-λ N that imports into from left end and the protection downstream signal λ 1-λ i that imports into from right-hand member and the upward signal of ONU afterwards.In the middle of these signals, have only work downstream signal λ i and protection downstream signal λ i can pass through the F-P etalon, all the other signals then are sent to the other end of ONU via reflection of F-P etalon and optical circulator from an end.After protection downstream signal λ i reaches the F-P etalon by optical circulator, be sent to the conductively-closed of optical isolator place through optical switch.After work downstream signal λ i reaches the F-P etalon by optical circulator, be sent to coupler through optical switch, and by it signal be divided into two parts, a part is delivered to receiver and is received, and another part is amplified by SOA, and modulation becomes upward signal again.Upward signal λ ' i is successively by being injected into the port 4 of optical circulator behind isolator, optical switch, the FP etalon, and by port one output, is back to RN according to the direction opposite with the work downstream signal.When fracture appears in the optical fiber of ONU front, this ONU will not receive the work downstream signal, and this moment, its watch-dog can change the optical switch state automatically, made ONU enter protected mode.At this moment; the signal that ONU receives is the protection downstream signal that the upward signal λ ' K-λ ' i-1 that imports into of left end and right-hand member import into; have only protection downstream signal λ i can pass through the F-P etalon, all the other signals then are sent to the other end of ONU via reflection of F-P etalon and optical circulator from an end.The λ i of protection downstream signal will be modulated into upward signal λ ' i by the same the amplification by SOA again according to the work downstream signal of normal mode.Then, this upward signal will be injected into the port 2 of optical circulator, and by port 3 outputs, send back RN according to the direction opposite with the protection downstream signal.
The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and remarkable advantage: (1) scheme need not to be provided with specially any monitor channel, can finish the switching of protection link to keep communication under the situation that profile fiber damages; (2) scheme need not to set up the protection profile fiber and can realize protection to whole distributed network, thereby has significantly reduced the optical fiber occupancy; (3) 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; (4) network is lower for the requirement of device, and is easy to implement.
Description of drawings
Fig. 1 realizes system's structured flowchart under normal condition of self-healing function for one embodiment of the invention card Wavelength division multiplexing-passive light net.
Fig. 2 realizes system's structured flowchart under guard mode of self-healing function for one embodiment of the invention card Wavelength division multiplexing-passive light net.
Fig. 3 is optical network unit ONU structured flowchart under normal condition in the system of one embodiment of the invention card Wavelength division multiplexing-passive light net realization self-healing function.
Fig. 4 is optical network unit ONU structured flowchart under guard mode in the system of one embodiment of the invention card Wavelength division multiplexing-passive light net realization self-healing function.
Embodiment
The preferred embodiments of the present invention accompanying drawings is as follows:
Embodiment one: referring to Fig. 1 Fig. 2, this Wavelength division multiplexing-passive light net realizes that the system of self-healing function is by optical line terminal optical line terminal OLT (1), distant-end node distant-end node RN (2) and optical network unit optical network unit ONU (3) constitute, wherein, optical line terminal optical line terminal OLT (1) is connected with distant-end node distant-end node RN (2) by feed fiber, and optical network unit optical network unit ONU (3) then is connected with distant-end node distant-end node RN (2) by profile fiber.System's optical network unit ONU (3) number and wavelength number are N, each optical network unit ONU (3) use one independently wavelength communicate.
Embodiment two: present embodiment is identical with embodiment one, and special feature is: referring to Fig. 1 Fig. 2, above-mentioned optical line terminal OLT (1) is by N transmitter (6), N receiver (7), 2 wavelength division multiplexers (8,9), 1 optical circulator (10) and an optical switch (11) constitute; Downstream signal closes ripple by wavelength division multiplexer (3) after being sent by transmitter (6), then successively by in the middle of optical circulator (10) and optical switch (11) the injection work feed fiber (4); After upward signal is sent to optical line terminal OLT (1) by work feed fiber (4), be sent to wavelength division multiplexer (9) punishment ripple by optical switch (11) and optical circulator (10) successively, send to each receiver (7) at last and receive.
Referring to Fig. 1 Fig. 2; said distal ends node RN (2) is made of coupler (12); its role is to downstream signal be divided into work downstream signal and protection downstream signal respectively according to clockwise with counterclockwise pass to each optical network unit ONU (3), and the upward signal of each optical network unit ONU (3) injected work feed fiber (4) respectively and protect feed fiber (5) thus being sent to optical line terminal OLT (1) locates.
Embodiment three: present embodiment is identical in embodiment one, special feature is: referring to Fig. 3 Fig. 4, above-mentioned optical network unit ONU (3) is by 14 port photocirculator (14), 2 F-P etalons (15), 1 2*2 optical switch (17), 1 coupler (18), 1 receiver (19), 1 semiconductor optical amplifier SOA (20), 1 watch-dog (16) and 1 isolator (21) constitute; The main effect of optical network unit ONU (3,13) is: receive the work downstream signal under the normal condition, and the shielding protection downstream signal, and upward signal is sent to distant-end node RN (2) according to the opposite transmission direction of work downstream signal; Under the guard mode, receive the protection downstream signal, and upward signal is sent to distant-end node RN (2) according to the opposite transmission direction of protection downstream signal.
Embodiment four: referring to Fig. 1 Fig. 2, this Wave division multiplexing passive optical network realizes that the transmission method of the system of self-healing function is: adopt said system to transmit, it is characterized in that: each transmitter (6) in the optical line terminal OLT (1) sends downstream signal, and after closing ripple by wavelength division multiplexer (8), inject work feed fiber (4) by optical circulator (10) and optical switch (11), and be sent to distant-end node RN (2) by it; In distant-end node RN (2), downstream signal is divided into two parts, and a part is transmitted along clockwise direction as the work downstream signal, and another part is as protection downstream signal, transmission in the counterclockwise direction; Under normal condition, each optical network unit ONU (3) all receives the work downstream signal and the shielding protection downstream signal, the upward signal that is sent by each optical network unit ONU (3) then injects distant-end node RN (2) along the direction opposite with the work downstream signal, promptly makes uplink and downlink signals all by same link transmission; When profile fiber ruptures, being in breakaway poing optical network unit ONU (3) does not before damage owing to its link, so still be in normal condition, optical network unit ONU behind the breakaway poing (13) then automatically switches to guard mode because link damages, the optical network unit ONU (13) that is in guard mode receives the protection downstream signal, and with its upward signal by injecting distant-end node RN (2) with the opposite transmission direction of protection downstream signal, promptly make the optical network unit ONU (13) that is in guard mode utilize the unspoiled link of opposite side to carry out the transmission of uplink and downlink signals, thereby the system that makes has realized self-healing function; Uplink signal transmissions is to distant-end node RN (2), in work feed fiber (4) transmission ray road terminal OLT (1), signal is transferred into wavelength division multiplexer (9) demultiplexing by optical switch (11) and optical circulator (10) successively subsequently, is sent to receiver (7) at last and receives.
Embodiment five: present embodiment is identical with embodiment four; special feature is: referring to Fig. 3 Fig. 4; the method that above-mentioned link automaticallyes switch is: under normal mode, the signal that optical network unit ONU (3) I receives comprises the work downstream signal λ i-λ N that imports into from left end and the protection downstream signal λ 1-λ i that imports into from right-hand member and the upward signal of optical network unit ONU (3) afterwards.In the middle of these signals; have only work downstream signal λ i and protection downstream signal λ i can pass through F-P etalon (15); all the other signals then are sent to the other end of optical network unit ONU (3) via F-P etalon (15) reflection and optical circulator (14) from an end; after protection downstream signal λ i reaches F-P etalon (15) by optical circulator (14); be sent to optical isolator (21) through optical switch (17) and locate conductively-closed; after work downstream signal λ i reaches F-P etalon (15) by optical circulator (14); be sent to coupler (18) through optical switch (17); and signal is divided into two parts by it; a part is delivered to receiver (19) and is received; another part is amplified by semiconductor optical amplifier SOA (20), and modulation becomes upward signal again.Upward signal λ ' i is successively by being injected into the port 4 of optical circulator (14) behind isolator (21), optical switch (17), the F-P etalon (15), and by port one output, is back to distant-end node RN (2) according to the direction opposite with the work downstream signal; When fracture appears in the optical fiber of optical network unit ONU (13) front; this optical network unit ONU (13) will not receive the work downstream signal; its watch-dog this moment (16) can change optical switch (17) state automatically; make optical network unit ONU (3) enter protected mode; at this moment; the signal that optical network unit ONU (13) receives is the protection downstream signal that the upward signal λ ' K-λ ' i-1 that imports into of left end and right-hand member import into; have only protection downstream signal λ i can pass through F-P etalon (15), all the other signals then are sent to the other end of optical network unit ONU (13) via F-P etalon (15) reflection and optical circulator (14) from an end.The λ i of protection downstream signal will be modulated into upward signal λ ' i by the same the amplification by semiconductor optical amplifier SOA (20) again according to the work downstream signal of normal mode.Then, this upward signal will be injected into the port 2 of optical circulator (14), and by port 3 outputs, send back distant-end node RN (2) according to the direction opposite with the protection downstream signal.
Claims (5)
1. a ring wave division multiplexing passive optical network network is realized the system of self-healing function, 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) by feed fiber (4,5), and optical network unit ONU (3) then is connected with distant-end node distant-end node RN (2) by 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.It is characterized in that: described optical line terminal OLT (1) is by N transmitter (6), N receiver (7), and 2 wavelength division multiplexers (8,9), 1 optical circulator (10) and an optical switch (11) constitute; A described wavelength division multiplexer (8) demultiplexing end is connected with described transmitter (6); multiplexing end is connected with described optical circulator (10) 1 ports; described wavelength division multiplexer (9) demultiplexing end is connected with described receiver (7); multiplexing end is connected with optical circulator (10) 3 ports; optical circulator (10) port 2 is connected with described optical switch (11), and all the other ports of optical switch (11) are connected with protection feed fiber (5) with work feed fiber (4) respectively.
2. realize the system of self-healing function according to claims 1 described ring wave division multiplexing passive optical network network, it is characterized in that: described distant-end node RN (2) is made of 1 coupler (12); 2 ports of coupler (12) one ends are connected with protection feed fiber (5) with work feed fiber (4) respectively, and 2 ports of the other end are connected with 2 optical network unit ONU (3) respectively.
3. realize the system of self-healing function according to claims 1 described ring wave division multiplexing passive optical network network, it is characterized in that: described optical network unit ONU (3) is by 14 port photocirculator (14), 2 F-P etalons (15), 1 2*2 optical switch (17), 1 coupler (18), 1 receiver (19), 1 semiconductor optical amplifier SOA (20), 1 watch-dog (16) and 1 isolator (21) constitute; Described optical circulator (14) port one, 3 are connected with adjacent optical network unit ONU (3) respectively, they are 2 years old, 4 ports are connected with two described F-P etalons (15) respectively, 2 ports of described optical switch (17) one ends are connected with two F-P etalons (15) respectively, the other end is connected with optical isolator (21) with the multiplexing end of coupler (18) respectively, wherein the circuit tap that is connected with the multiplexing end of coupler (18) is to watch-dog (16), and by the monitoring of watch-dog (16) enforcement to optical switch (17), the demultiplexing end of coupler (18) is connected with semiconductor optical amplifier SOA (20) with receiver (19) respectively, and semiconductor optical amplifier SOA (20) other end is connected with optical isolator (21).
4. a ring wave division multiplexing passive optical network network is realized the transmission method of the system of self-healing function: adopt said system to transmit, it is characterized in that: each transmitter (6) in the optical line terminal OLT (1) sends downstream signal, and after closing ripple by wavelength division multiplexer (8), inject work feed fiber (4) by optical circulator (10) and optical switch (11), and be sent to distant-end node RN (2 by it; In distant-end node RN (2), downstream signal is divided into two parts, and a part is transmitted along clockwise direction as the work downstream signal, and another part is as protection downstream signal, transmission in the counterclockwise direction; Under normal condition, each optical network unit ONU (3) all receives the work downstream signal and the shielding protection downstream signal, the upward signal that is sent by each optical network unit ONU (3) then injects distant-end node RN (2) along the direction opposite with the work downstream signal, promptly makes uplink and downlink signals all by same link transmission; When profile fiber ruptures, being in breakaway poing optical network unit ONU (13) does not before damage owing to its link, so still be in normal condition, optical network unit ONU behind the breakaway poing (13) then automatically switches to guard mode because link damages, the optical network unit ONU (13) that is in guard mode receives the protection downstream signal, and with its upward signal by injecting distant-end node RN (2) with the opposite transmission direction of protection downstream signal, promptly make the optical network unit ONU (13) that is in guard mode utilize the unspoiled link of opposite side to carry out the transmission of uplink and downlink signals, thereby the system that makes has realized self-healing function; Uplink signal transmissions is to distant-end node RN (2), in work feed fiber (4) transmission ray road terminal OLT (1), signal is transferred into wavelength division multiplexer (9) demultiplexing by optical switch (11) and optical circulator (10) successively subsequently, is sent to receiver (7) at last and receives.
5. ring wave division multiplexing passive optical network network according to claim 4 realize self-healing function the transmission method of system; it is characterized in that the method that described link automaticallyes switch is: under normal mode, the signal that optical network unit ONU (3) I receives comprises the work downstream signal λ i-λ N that imports into from left end and the protection downstream signal λ 1-λ i that imports into from right-hand member and the upward signal of optical network unit ONU (3) afterwards.In the middle of these signals; have only work downstream signal λ i and protection downstream signal λ i can pass through F-P etalon (15); all the other signals then are sent to the other end of optical network unit ONU (3) via F-P etalon (15) reflection and optical circulator (14) from an end; after protection downstream signal λ i reaches F-P etalon (15) by optical circulator (14); be sent to optical isolator (21) through optical switch (17) and locate conductively-closed; after work downstream signal λ i reaches F-P etalon (15) by optical circulator (14); be sent to coupler (18) through optical switch (17); and signal is divided into two parts by it; a part is delivered to receiver (19) and is received; another part is amplified by semiconductor optical amplifier SOA (20), and modulation becomes upward signal again.Upward signal λ ' i is successively by being injected into the port 4 of optical circulator (14) behind isolator (21), optical switch (17), the F-P etalon (15), and by port one output, is back to distant-end node RN (2) according to the direction opposite with the work downstream signal; When fracture appears in the optical fiber of optical network unit ONU (13) front; this optical network unit ONU (13) will not receive the work downstream signal; its watch-dog this moment (16) can change optical switch (17) state automatically; make optical network unit ONU (3) enter protected mode; at this moment; the signal that optical network unit ONU (13) receives is the protection downstream signal that the upward signal λ ' K-λ ' i-1 that imports into of left end and right-hand member import into; have only protection downstream signal λ i can pass through F-P etalon (15), all the other signals then are sent to the other end of optical network unit ONU (13) via F-P etalon (15) reflection and optical circulator (14) from an end.The λ i of protection downstream signal will be modulated into upward signal λ ' i by the same the amplification by semiconductor optical amplifier SOA (20) again according to the work downstream signal of normal mode.Then, this upward signal will be injected into the port 2 of optical circulator (14), and by port 3 outputs, send back distant-end node RN (2) according to the direction opposite with the protection downstream signal.
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| CN102075282A (en) * | 2011-02-24 | 2011-05-25 | 上海大学 | System and method for realizing dynamic wavelength scheduling and protection functions in wavelength division multiplexing passive optical network |
| CN103314542A (en) * | 2010-12-20 | 2013-09-18 | 瑞典爱立信有限公司 | Method and arrangement for receiving an optical input signal and transmittning an optical output signal |
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| CN106788744A (en) * | 2017-02-14 | 2017-05-31 | 国网江苏省电力公司无锡供电公司 | Power system halo network link nodes unattended intelligent switching system |
| CN112088501A (en) * | 2019-03-29 | 2020-12-15 | 华为技术有限公司 | Single-fiber looped network structure |
| CN112088501B (en) * | 2019-03-29 | 2022-07-12 | 华为技术有限公司 | Single-fiber looped network structure |
| CN114095810A (en) * | 2022-01-21 | 2022-02-25 | 武汉一网万联科技有限公司 | Optical fiber to desktop system capable of preventing interruption and arrangement method thereof |
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