CN101841746B - Wavelength division multiplexing passive optical network optical line terminal having shared protection function - Google Patents
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Abstract
The invention discloses a wavelength division multiplexing passive optical network optical line terminal having a shared protection function. The outside of the optical line terminal is provided with two ports, namely a primary port and a backup port; the inside of the optical line terminal comprises a primary optical transceiver module, a backup optical transceiver module and a control module as well as a 2*2 optical path switching module for optical path selection and switching; wherein the control module is connected to the primary optical transceiver module and the backup optical transceiver module, the number of the optical transceiver units of the backup optical transceiver module is not more than that of the optical transceiver unit needed to be protected by the primary optical transceiver module, at least light sources of part of optical transceiver units are wavelength-adjustable light sources; the primary optical transceiver module and the backup optical transceiver module are respectively connected with the primary port and the backup port through the 2*2 optical path, and the control module is also connected to a control end of the 2*2 optical path connected with the backup port; the control module is connected with the primary optical transceiver module and the backup optical transceiver module; and a light source of at least part of optical transceiver units of the backup optical transceiver module adopts a wavelength dimmablelight source. The optical line terminal provided by the invention can realize the protection to all wavelength optical transceivers in the wavelength division multiplexing passive optical network optical line terminal at the low cost of a redundant device, can realize the fault protection switching to a feeder line fiber and the local recovery to local faults of a distribution fiber, and even canrealize the recovery of a plurality of concurrent faults in a network when used in the network having double-fiber backups.
Description
Technical field
The present invention relates to EPON, relate in particular to the optical line terminal of Wave division multiplexing passive optical network.
Background technology
Characteristics such as the optical fiber access technology is one of major technique that realizes broadband access network of future generation, has high bandwidth, and big capacity is highly reliable, and service quality is good are convenient to realize many net unifications of voice, data, video etc.Increase along with Access Network institute loaded service kind and bandwidth; especially incorporating into of possible speech business; make more and more higher to the requirement of its reliability; concrete show the raising that network survivability is required; namely require network when breaking down, to have redundancy protecting and fast restoration capabilities, even occurring also keeping communication under the situation of catastrophic failure to greatest extent.Consider from the angle of network cost, also will realize such protection with little cost.
In EPON (hereinafter to be referred as PON) technology, mainly there are Wave division multiplexing passive optical network (hereinafter to be referred as WDM-PON) and two kinds of technology of time division multiplexing EPON (hereinafter to be referred as TDM-PON) at present, the TDM-PON technology is ripe relatively, the bandwidth availability ratio height, device cost is relatively low, existing application more widely; WDM-PON accesses terminal higher bandwidth is provided and can be each, favorable expandability, can be following network application upgrading expansion gives security, can be described as the development trend of following optical access network, but its element cost is higher relatively, and the utilization rate to the wide resource of light belt is relatively low, and however the proposition of various low-cost multi wave length illuminating source schemes makes the practicability of WDM-PON become possibility.In addition, no matter be TDM-PON technology or WDM-PON technology, the maximum user number that can insert all is subjected to the restriction of power and bandwidth, still there is restriction in this for applications that some high density inserts, as in the big urban cells of the density of population, skyscraper, occasions such as company, universities and colleges will utilize TDM-PON or WDM-PON technology to realize that real Fiber to the home or fiber to the desk still has difficulties at present merely.By contrast, use the mixing of TDM-PON and WDM-PON technology the user's access number that under the prerequisite that guarantees bandwidth, to realize hundreds of nearly even several thousand, have higher bandwidth resources utilance and high cost performance, and can be TDM-PON and provide level and smooth transition to the escalation process of WDM-PON.
Optical access network is mainly by optical line terminal (hereinafter to be referred as OLT); several parts of optical fiber distributing network (hereinafter to be referred as OND) and corresponding link nodes (generally including a distant-end node (hereinafter to be referred as RN)) and optical network unit (hereinafter to be referred as ONU)/Optical Network Terminal (hereinafter to be referred as ONT) are formed; redundancy protecting to optical access network also can carry out respectively at these several parts; because the light trunk/fault of feeder line fiber section can have influence on the access of all users in the network in OLT and the fiber distribution network, so the position that when considering network protection, normally at first will consider.Again since to the protection of fiber section except adopting double optical fiber even separate route; usually have OLT or ONU end to provide the monitoring switch function to cooperate realization to protection and the recovery of optical fiber link, the OLT that therefore has defencive function is the key that realizes network protection and recovery.
At present can adopt double optical transceiver module or double OLT to realize to the protection of OLT among the TDM-PON; even if so because have only a pair of optical transceiver module to adopt the increase of double its cost of redundancy not very remarkable with respect to whole network among the OLT; but to the protection of OLT among the WDM-PON if also adopt double redundancy then the cost of its required increase will become the major limitation that this scheme realizes, its protection efficient is low too simultaneously.At present; WDM-PON has the mutual backup of the OLT that utilizes different PON to realize the protection of fiber failure; having provides switch function to realize the protection of slack light path in OLT or ONU; also have in OLT and to use redundant light source that other fixed wave length light source among the OLT is protected, both can protect also and can the scheme that fiber failure is protected not seen as yet the optical transceiver among the OLT.
Summary of the invention
Goal of the invention: in order to overcome the limitation of in the prior art PON being protected, the invention provides the OLT with share protect function of a kind of WDM-PON of being applicable to, it can be that network provides flexibly and protection more comprehensively with less redundant cost.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
A kind of Wavelength division multiplexing passive optical network optical line terminal with share protect function; its outside is provided with two ports; be called main port and standby port; on the main port/the downlink working wavelength number is m; on the standby port/the downlink working wavelength number is n; inside comprises key light transceiver module, standby optical transceiver module, and control module, the inner function that can work independent of one another, back up mutually, also can work simultaneously by two ports of following connected mode realization.It is λ that the key light transceiver module sends wavelength
1～λ
mDownstream signal, reception wavelength be λ
1'～λ
m' upward signal, connect main port; Standby optical transceiver module comprises one or more smooth Transmit-Receive Units, and the transmission wavelength is Λ
1～Λ
nDownstream signal, reception wavelength be Λ
1'～Λ
n' upward signal, connect standby port, (adjustable) wave-length coverage of its light Transmit-Receive Unit will cover all wave-length coverages that need protection of main port at least, also can be in residing wave-length coverage after the non-zero integer multiples of (hereinafter to be referred as FSR) between the free spectrum zone of the transmission wave-length coverage translation distant-end node that described main port needs protection for (adjustable) wave-length coverage of light source, the light source of all or part of smooth Transmit-Receive Unit adopts Wavelength tunable light source; Control module receives from the feedback signal of key light transceiver module and standby optical transceiver module and controls the transmitting-receiving of key light transceiver module and standby optical transceiver module, and the control end with key light transceiver module and standby optical transceiver module is connected respectively.That the OLT of this kind connected mode is called is main-be equipped with OLT.
Described OLT can also comprise that a 2 * 2(g * h who is used for the light path selection and switches represents to have g input port and h output port, perhaps have h input port and g output port) the optical path switching module, described key light transceiver module is connected main port and standby port with standby optical transceiver module respectively by 2 * 2 optical path switching modules, described control module is also controlled switching of 2 * 2 optical path switching modules, connects the control end of 2 * 2 optical path switching modules.The OLT of this kind connected mode is called and lead-be equipped with-switches OLT.
Described key light transceiver module can adopt the structure of optical transceiver module among the OLT of existing various WDM-PON, compare the lower-cost transmission wavelength of tunable light source and be respectively λ as adopting the light of being formed by fabry-Perot type laser array (hereinafter to be referred as the FP-LD array), array waveguide grating (hereinafter to be referred as AWG) and wideband light source to receive and dispatch array structure, also can adopting
1～λ
mThe structure of fixed wave length light source, and use in wavelength multiplexing to an optical fiber of multiplexer with all transmissions, similarly use demodulation multiplexer that wavelength is λ
1'～λ
m' downstream signal receive in each photodetector.Go up here/downstream signal can also can make up with optical circulator or broadband wave multiplexer at the output/input of multiplexer/demultiplexer in the inner combination of light Transmit-Receive Unit.
The light Transmit-Receive Unit number of the above standby optical transceiver module can be not more than the light Transmit-Receive Unit number that needs protection in the key light transceiver module, and the receiving and transmitting signal of light Transmit-Receive Unit combines (according to last/following road wavelength Λ by coupler or optical circulator
i' and Λ
i, n 〉=i 〉=1, between relation select to use coupler or the relevant coupler of wavelength of Wavelength-independent type, also claim broadband multiplexer/wave multiplexer).During n=1, OLT has the highest protection efficient, recommends under the situation that the failure rate of OLT and optical fiber link is very low in network to use; N〉1 o'clock, also need use mixer or optical switch and multiplexer that multiple signals are combined into one the tunnel and link to each other with standby port; Be under the situation of tunable light source at n light source, need to use the optical switch of n * m that these light Transmit-Receive Units are linked to each other with m input port of multiplexer, in the backup optical transceiver module, use under the situation of the individual fixed wave length light source of n ', use (n-n ') * optical switch of m links to each other the tunable optical Transmit-Receive Unit with m input port of multiplexer.When n=1, or use mixer at n〉1 o'clock multiple signals are combined under one tunnel the situation, need to use the wavelength-tunable photodetector, its bandwidth is less than channel spacing.The wavelength regulation scope of described Wavelength tunable light source will cover all occupied wave-length coverages of transmission wavelength that need protection of main port, perhaps cover residing wave-length coverage after the non-zero integer multiples of described transmission wave-length coverage translation distant-end node FSR, the wavelength regulation scope of wavelength-tunable photodetector will cover all occupied wave-length coverages of reception wavelength that need protection of main port; Described wavelength-tunable photodetector can be made up of a broadband light detector and a tunable filter.
Beneficial effect: OLT provided by the invention, adopt the share protect technology can improve the protection efficient of WDM-PON, especially in standby optical transceiver module, during the number n=1 of light Transmit-Receive Unit, can realize the protection to all working wavelength light Transmit-Receive Unit among the OLT with the redundancy of minimum; In network, adopt when using OLT provided by the invention under the situations of two fine backups, also can realize recovering to trunk/feeder line optical fiber and distribution optical fibers fault, local fault for some distribution optical fibers can realize local recovery under the situation that does not influence other operate as normal ONU, and can realize the recovery to many places concurrent fault in the network; Adopt unified light Transmit-Receive Unit design can reduce type and the quantity of the required standby device of OLT in the standby optical transceiver module, reduce the mounted inside of OLT and the complexity that is connected with external devices thereof simultaneously.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of key light transceiver module;
Fig. 3 is the structural representation of standby optical transceiver module;
Fig. 4 realizes the schematic diagram of recovery under several network failure situations for the WDM-PON network that uses OLT provided by the invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explanation.
Letter in the figure and symbol description:
Be illustrated in figure 1 as the OLT that is used for WDM-PON with share protect function, the outside is provided with main port and standby port.In the need protection of main port/the downlink working wavelength number is m (need protection with whole wavelength here and be example), is designated as λ respectively
1'～λ
m' and λ
1～λ
m, m wherein〉and 1; On the standby port/the downlink working wavelength number is n, is designated as Λ respectively
1'～Λ
n' and Λ
1～Λ
n, m 〉=n 〉=1 wherein, its connected mode by Fig. 1 realizes that two ports can be worked independent of one another, backup mutually, the function that also can work simultaneously.As shown in Figure 1, it comprises key light transceiver module, standby optical transceiver module and control module and 2 * 2 optical switches that use as 2 * 2 optical path switching modules, and wherein key light transceiver module transmission wavelength is λ
1～λ
mDownstream signal, the reception wavelength is λ
1'～λ
m' upward signal; Standby optical transceiver module comprises one or more smooth Transmit-Receive Units, and the light source of all or part of smooth Transmit-Receive Unit adopts Wavelength tunable light source, and it sends wavelength is Λ
1～Λ
nDownstream signal, the reception wavelength is Λ
1'～Λ
n' upward signal; Control module connects the control port of key light transceiver module and standby optical transceiver module, the transmitting-receiving of control key light transceiver module and standby optical transceiver module; 2 * 2 optical switches are used for the selection of light path and switch, and are controlled by control module equally.
Be illustrated in figure 2 as three kinds of structural representations of the key light transceiver module in Fig. 1 structure.Fig. 2 (a) adopts the transmission wavelength to be respectively λ
1～λ
mAnd receive wavelength and be respectively λ
1'～λ
m' the fixed wave length optical transceiver, and use multiplexer/demultiplexer that all downstream signals and upward signal are carried out multiplexing and demultiplexing.The structure that Fig. 2 (b) adopts light source and photodetector to separate, on/following road light signal is in the output of multiplexer/demultiplexer/go into end to make up by optical circulator, Fig. 2 (c) then be on/following road light signal is in the output of multiplexer/demultiplexer/go into end to make up by the broadband wave multiplexer.
Be illustrated in figure 3 as three kinds of structural representations of the standby optical transceiver module in Fig. 1 structure.Wherein Fig. 3 (a) is the simple structure of standby transceiver module, receiving and transmitting signal is combined by coupler (or optical circulator) by a Wavelength tunable light source (can be with isolator) and a wavelength-tunable photodetector, described Wavelength tunable light source is made of an adjustable wavelength laser, described wavelength-tunable photodetector is made of a tunable filter and a photodetector, and described coupler can be selected according to the relation between last/following road wavelength; Use the OLT of the standby optical transceiver module of this structure to have the highest protection efficient, under the very low situation of the failure rate of OLT and optical fiber link, recommend to use.The wavelength regulation scope of described Wavelength tunable light source will cover all occupied wave-length coverages of transmission wavelength that need protection of main port; perhaps cover residing wave-length coverage after the non-zero integer multiples of described transmission wave-length coverage translation distant-end node FSR, the wavelength regulation scope of wavelength-tunable photodetector will cover all occupied wave-length coverages of reception wavelength that need protection of main port.A kind of structure of Fig. 3 (b) when having the light Transmit-Receive Unit of n wavelength in the standby optical transceiver module, it uses the optical switch of n * m that n light Transmit-Receive Unit port linked to each other with m input port of multiplexer, and multiple signals are combined into one the tunnel link to each other with standby port.The another kind of structure of Fig. 3 (c) when having the light Transmit-Receive Unit of n wavelength in the standby optical transceiver module, it uses a mixer that multiple signals are combined, this structure in the value of n than hour adopting.
Fig. 4 is the WDM-PON network of use OLT provided by the invention is realized recovery under several network failure situations situation, but wherein solid line is the optical fiber of proper communication, and dotted line is the optical fiber that breakpoint is arranged, can not proper communication.Recovery situation when Fig. 4 (a) is the network local fault, among the OLT indivedual light Transmit-Receive Unit faults appear in the key light transceiver module or/and the distribution optical fibers of the corresponding ONU that connects when breaking down, can utilize the signal of the light Transmit-Receive Unit transmitting-receiving corresponding failure wavelength of standby optical transceiver module to realize recovering; Shown in Fig. 4 (a), TR in the key light transceiver module of OLT
X2Or/and the uplink and downlink operation wavelength corresponding with it is λ
2' and λ
2ONU
2When the distribution optical fibers that connects broke down, standby optical transceiver module (having adopted the simple structure of single smooth Transmit-Receive Unit here) was λ by the transmitting-receiving wavelength
2' and λ
2Signal realize the recovery of network function; Utilize the OLT of this structure when this local fault is recovered, can not influence other wavelength (downstream signal λ in this example
1, λ
3λ
m, upward signal λ
1', λ
3' ... λ
m') operate as normal.Fig. 4 (b) is the network recovery situation under the feeder line fiber failure situation, and through the switching of 2 * 2 optical path switching modules, the signal in the key light transceiver module can communicate with each ONU through standby optical fiber link.Recovery situation under the situation of many places fault appears in Fig. 4 (c) for distribution optical fibers, adopt the standby optical transceiver module that has only a light Transmit-Receive Unit, as shown in the figure, and when connecting ONU
1And ONU
2Main distribution optical fibers and connect ONU
mStandby distribution optical fibers when all breaking down, OLT can will descend the road wavelength X by switching of 2 * 2 optical path switching modules
1λ
M-1And the wavelength of setting out on a journey is λ
1' ... λ
M-1' signal be switched to the transmission of getting on of standby optical fiber, and utilize standby transceiver module transmitting-receiving λ
m', λ
mWavelength signals is through main distribution optical fibers and ONU
mCommunication realizes the recovery of whole network; Similarly when use among the OLT has the standby optical transceiver module of n light Transmit-Receive Unit, can realize the recovery fully to 2n+1 local fault of the light Transmit-Receive Unit fault that comprises the key light transceiver module in the network and distribution optical fibers single fiber fault at least.Recovery situation when Fig. 4 (d) ring occurs and goes up the optical fiber link failure when being depicted as OLT provided by the invention and being used in the network with ring topology is when ring is gone up ONU
11And ONU
12When fibre appears breaking in the optical fiber link that couples together, if these two ONU use/following road wavelength X
1'/λ
1, in TDM/WDM-PON, then can utilize two ports of OLT to receive and dispatch λ simultaneously
1', λ
1Realize affected ONU
12Business recovery.
The above only is preferred implementation of the present invention; be noted that for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. Wavelength division multiplexing passive optical network optical line terminal with share protect function, it is characterized in that: described optical line terminal outside is provided with two ports, be called main port and standby port, inside comprises and can work independent of one another, backup mutually, the key light transceiver module that also can work simultaneously and standby optical transceiver module, and receive from the feedback signal of key light transceiver module and standby optical transceiver module and control the control module of the transmitting-receiving of key light transceiver module and standby optical transceiver module, described control module is connected with the control end of key light transceiver module and standby optical transceiver module respectively; Described standby optical transceiver module comprises one or more smooth Transmit-Receive Units, the light Transmit-Receive Unit number of standby optical transceiver module is not more than the number of the light Transmit-Receive Unit that the key light transceiver module needs protection, and the light source of all or part of smooth Transmit-Receive Unit adopts Wavelength tunable light source; Described key light transceiver module is connected main port and standby port with standby optical transceiver module respectively by 2 * 2 optical path switching modules, and described control module also is connected with the control end of 2 * 2 optical path switching modules;
The OLT that has the standby optical transceiver module of n light Transmit-Receive Unit for use, when n+1 place fault appears in main distribution optical fibers, and the standby distribution optical fibers number of defects is when being less than the main distribution optical fibers number of defects, described optical line terminal will be transmitted in by switching of described 2 * 2 optical path switching modules and main be switched to the transmission of getting on of standby optical fiber with the uplink and downlink signal on the optical fiber, and utilize the light Transmit-Receive Unit of standby optical transceiver module to communicate by letter with the optical network unit that still is subjected to fault effects with optical fiber through main, realize the recovery of whole network.
2. the Wavelength division multiplexing passive optical network optical line terminal with share protect function according to claim 1 is characterized in that: use optical switch and multiplexer multiple signals to be combined into one the tunnel in the light Transmit-Receive Unit number of described standby optical transceiver module during more than one.
3. the Wavelength division multiplexing passive optical network optical line terminal with share protect function according to claim 1 is characterized in that: use mixer multiple signals to be combined into one the tunnel in the light Transmit-Receive Unit number of described standby optical transceiver module during more than one.
4. the Wavelength division multiplexing passive optical network optical line terminal with share protect function according to claim 3 is characterized in that: to adopting the light Transmit-Receive Unit of Wavelength tunable light source in the described standby optical transceiver module, use the wavelength-tunable photodetector.
5. the Wavelength division multiplexing passive optical network optical line terminal with share protect function according to claim 1 is characterized in that: when the light Transmit-Receive Unit number of described standby optical transceiver module was one, this light Transmit-Receive Unit used wavelength-tunable photodetector.
6. according to claim 4 or 5 described Wavelength division multiplexing passive optical network optical line terminals with share protect function, it is characterized in that: described wavelength-tunable photodetector is connected with the broadband light detector by wavelength tunable filter and is constituted.
7. the Wavelength division multiplexing passive optical network optical line terminal with share protect function according to claim 1 is characterized in that: the signal that the light Transmit-Receive Unit of described standby optical transceiver module sends and receives is by coupler or optical circulator combination.
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| CN102421205A (en) * | 2011-12-09 | 2012-04-18 | 佛山科学技术学院 | Zigbee network coordinator |
| WO2015060277A1 (en) | 2013-10-25 | 2015-04-30 | 日本電信電話株式会社 | Optical communication system and optical communication abnormality-recovery method |
| CN104301029A (en) * | 2014-04-22 | 2015-01-21 | 国家电网公司 | Wavelength division multiplexing passive optical network system based on single fiber |
| CN104390685A (en) * | 2014-11-18 | 2015-03-04 | 苏州佳因特光电科技有限公司 | Portable optical fiber dynamic weighing system |
| CN105763245A (en) * | 2014-12-18 | 2016-07-13 | 中兴通讯股份有限公司 | Optical transceiving module |
| CN106033993B (en) * | 2015-03-16 | 2019-01-18 | 东南大学 | Optical line terminal interface arrangement and its error protection and power-economizing method |
| CN113872685B (en) * | 2020-06-30 | 2023-04-11 | 华为技术有限公司 | Optical line terminal OLT equipment and optical path processing method |
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