CN1258969A - 4 optical fibre bidirectional circuit change ring network system in valve division multiplex system - Google Patents
4 optical fibre bidirectional circuit change ring network system in valve division multiplex system Download PDFInfo
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- CN1258969A CN1258969A CN99118615A CN99118615A CN1258969A CN 1258969 A CN1258969 A CN 1258969A CN 99118615 A CN99118615 A CN 99118615A CN 99118615 A CN99118615 A CN 99118615A CN 1258969 A CN1258969 A CN 1258969A
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- protection circuit
- wavelength division
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0289—Optical multiplex section protection
- H04J14/0291—Shared protection at the optical multiplex section (1:1, n:m)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
- H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0215—Architecture aspects
- H04J14/0216—Bidirectional architectures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0283—WDM ring architectures
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention provides a 4-optical BLSR (fiber bidirectional line switch ring) network. Two pairs of working and protecting lines for transmitting wave division multiplexing (WDM) optical signal are used for connecting plural nodes. Each node has a first and a second add-drop multiplexers (ADM) each of which are connected to a pair of working and protecting lines in order to add add-drop multiplexer for working line thereby relaying for the protecting line via optical amplification.
Description
The application quotes the application of early submitting in Korea S industrial assets office aspire on December 30th, 1998, also formally given sequence number No.98-61037 there that is entitled as " 4 fiber bi-directional line switched ring networks in the wavelength-division multiplex system ", it is included in this, and requires to obtain all interests from this application generation according to 35 U.S.C. § 119.
The present invention relates to BLSR (bidirectional line switched rings) network, in more detail, relate to a kind of one of them node is connected to adjacent node by two pairs of work and protection circuit 4 optical fiber BLSR networks.
BLSR is a kind of selfreparing ring that generally is used for protecting synchronous digital hierarchy (SHD) network.The selfreparing ring is divided into BLSR and UPSR (one-way passage commutative ring).Although the latter has the simple advantage of operation algorithm, the former is more widely used, because the delivery value of its every optical fiber is higher.In BLSR, as at typical linear network, it is two-way sending and receiving, and BLSR has two types: 2 optical fiber BLSR and 4 optical fiber BLSR.
Simultaneously, wavelength division multiplexing (WDM) scheme becomes more universal in optical transmission system.The WDM transmission is the propagation of the optical signalling of multiple different wave length by one optical fiber.On the other hand, wavelength division multiplex decomposes the anti-operation that refers to wavelength division multiplexing.
The WDM transmission technology is to improve the method the most easily of transmittability in the optical communication network, and is embodied in the WDM transmission system.The WDM transmission system is carried out wavelength division multiplexing to the multi-channel data of transmission, the data that receive is carried out wavelength division multiplex decompose, and the multichannel decomposed data is assigned to the lower rate transmissions system of lower level.Here, wavelength division multiplexing is carried out with optical coupler or AWG (array waveguide grating), and the wavelength division multiplex decomposition is then carried out with AWG or FBG (optical fiber Bragg raster).EDFA (bait doped optical fibre amplifier) is as optical amplifier.
In the exploitation of WDM transmission system, below 3 problems be that tool is challenging: (1) be contained in the multiplex signal with respect to the skew stability of each wavelength of reference wavelength and the power flatness of wavelength; (2) the relevant technology of optical coupler, AWG or FBG of decomposing with the wavelength division multiplex that is used for each wavelength; (3) the EDFA technology used apart from optical signal transmission of the length that does not have electrical-optical conversion or light-electricity to change.
People make an effort so that provide resist technology for obtaining stable service from each system that satisfies above-mentioned 3 requirements.But; because optical switch and the SNR (signal to noise ratio) of EDFA and the power inhomogeneities of each wavelength; can only reach the protection of 1+1 with interpolation-landing (add-drop) multiplexer (ADM), and under present technological level, still can't achieve the goal with 4 optical fiber BLSR.
This is must pass through wavelength division multiplex decomposer and 3R channel converter owing to passed through the optical multiplexing signal of interpolation-landing (add-drop) multiplexer (ADM) node and EDFA.If it is directly by wavelength division multiplexer, then because the long Distance Transmission of the difference on the luminous power of wavelength is impossible.The 3R channel converter carries out pumping again, more regularly and remove glitch (reglitching).In operation, the 3R channel converter converts light signal to the signal of telecommunication, and this signal of telecommunication is carried out timing again and removes glitch (reglitching), and the gained electrical signal conversion is become light signal, and this light signal is carried out pumping again.The complexity that this has increased design has improved equipment cost.As mentioned above, although wavelength-division multiplex system presses for 4 optical fiber BLSR, 4 optical fiber BLSR but are difficult to reach with present technology, and show the not high shortcoming of efficient on design and the cost.
Therefore, an object of the present invention is to provide simple and effective 4 optical fiber BLSR networks in a kind of wavelength-division multiplex system.
In order to achieve the above object, provide a kind of 4 optical fiber BLSR networks.A plurality of nodes are connected with protection circuit with two pairs of work, are used for transmitting the light signal of wavelength division multiplexing (WDM).Each node all has the first and second interpolation-landing (add-drop) multiplexers (ADM); and each ADM is connected on a pair of work and the protection circuit; so that add-land multiplexed for working line, and carry out relaying by light amplification for protection circuit.
By being described in detail with reference to the attached drawings most preferred embodiment of the present invention, it is more obvious that above-mentioned purpose of the present invention and advantage will become.In the accompanying drawing:
Fig. 1 is the sketch according to 4 optical fiber BLSR networks of one embodiment of the invention; And
Fig. 2 is the sketch of this 4 optical fiber BLSR network, and the optical cable between node A100 shown in Fig. 1 and the Node B 102 is cut off.
Fig. 1 illustrates according to 3 node A100 in the 4 optical fiber BLSR networks of one embodiment of the invention, the normal talking of B102 and C104.Adjacent node with a pair of working line 106 with 110 and a pair of protection circuit 108 be connected with 112, be used for transmitting wdm optical signal.Node A100, the configuration of B102 and C104 is identical, and the internal structure of two nodes is shown among the figure.Here be noted that identical parts are marked with different labels in two nodes.Now incite somebody to action description node A100 as an example.
Node A100 comprises first and second ADM114 and 116 that structure is identical.The one ADM114 is connected with protection circuit 108 with working line 106, and the 2nd ADM116 is connected with protection circuit 112 with working line 110.Identical parts are marked with different labels among first and second ADM114 and 116.After this a ADM114 as the 2nd ADM116 representative will only be described.
The one ADM114 comprises work preamplifier 200, first ring switch 202, wavelength division multiplex decomposer 204, channel modulator 206, wavelength division multiplexer 208, second ring switch 210, work booster amplifier 212 and bridge switch 214 along working line 106.The one ADM114 also comprises second ring switch 210, protection booster amplifier 216 and first ring switch 202 along protection circuit 108.First and second ring switches 202 and 210 all both had been connected to working line 106, were connected to protection circuit 108 again, were used for when the protection exchange working line 106 being parallel on the protection circuit 108.
As shown in an ADM114, the 4 optical fiber BLSR networks of Fig. 1 are carried out different operations to working line 106 with protection circuit 108.In other words, it is multiplexed to carry out typical interpolation-landing along working line 106, and finishes relay function as the protection booster amplifier 216 of EDFA by light amplification along 108 utilizations of protection circuit.
The working line 106 of heavy line indication among Fig. 1 and 110 work talk streams now will be described.Straight-through or add conversation, for example, SDH 2.5Gbps (gigabit/second) call volume is modulated into different wave length by channel modulator 206.Wavelength division multiplexer 208 is carried out multiplexed to wavelength optical signals on an optical fiber.Led to work booster amplifier 212 by multiplexed light signal or exchange on the protection circuit 108 by second ring switch 210.Under the normal condition shown in Fig. 1, worked booster amplifier 212 of multiplex signal amplifies, and is fed to Node B 102.The work preamplifier 400 of Node B 102 amplifies the light signal that receives from node A100.Signal after the amplification is decomposed into the signal of different wave length by first ring switch 402 by wavelength division multiplex decomposer 404 wavelength division multiplexs.Signal after multichannel is decomposed is landed or is straight-through.
Fig. 2 illustrates 4 optical fiber BLSR networks, between node A100 shown in Fig. 1 and Node B 102 with fiber cut.In Fig. 2, between the node adjacent, carry out and switch with the optical cable that cuts off.Both be added on the work booster amplifier 212 through the signal of wavelength division multiplexer 208 wavelength division multiplexing shunt operation, be added in again on the protection booster amplifier 216 by second ring switch 210.216 pairs of light signals that receive of protection booster amplifier carry out light amplification, and the light signal after amplifying is fed to node C104.Node C104 makes the light signal that receives along protection circuit transmission or amplification without the switching of ring switch, and output signal is fed to Node B 102.On the other hand, Node B 102 utilizes the switching in first ring switch 402 that the light signal that receives by protection circuit is switched to working line.Wavelength division multiplex decomposer 404 is decomposed into wavelength optical signals to the signal wavelength division multiplex that receives by working line.Signal after multichannel is decomposed drops to the lower level system, or is transferred to channel modulator 406.Among Fig. 2, the signal after all multichannels are decomposed all lands.Light path subsequently is identical with normal condition.
According to the present invention; because it is multiplexed to carry out typical 4 optical fiber BLSR interpolation-landing along working line; and only utilize single image intensifer to finish relay function by light amplification along protection circuit; can realize the reliable protection switching so needn't carry out light-electricity conversion or electrical-optical conversion; the result has simplified design, has reduced cost.Can utilize the 3R channel converter that the cost that carries out requiring when light-electricity conversion or electrical-optical are changed is reduced about 30 to 40%.
Although the present invention describes in detail with reference to certain embodiments, this is an example use.Though can hold 8 nodes of 80 kilometers of euclidean distance between node pair in the present invention at most; because depend on the number of EDFA at the situation lower node number that does not have light-electricity conversion or electrical-optical conversion; but, use the 3R repeater just can in the current SDH network, realize the multinode loop configuration every 7 nodes along protection circuit.Therefore, obviously, any one technical staff of this specialty can make many variations within the spirit and scope of the present invention.
Claims (3)
1. an optical fiber BLSR (bidirectional line switched rings) network, it comprises:
The a plurality of nodes that are connected with protection circuit by two pairs of work that are used for transmitting wavelength division multiplexing (WDM) light signal,
It is characterized in that: each node all has the first and second interpolation-landing (add-drop) multiplexers (ADM); and each ADM is connected on a pair of work and the protection circuit; so that add-land multiplexed for working line, and carry out relaying by light amplification for protection circuit.
2. 4 optical fiber BLSR networks of claim 1 is characterized in that each ADM comprises:
The work preamplifier, it is connected to the working line of first adjacent node, in order to amplify the light signal that receives by described working line from described adjacent node;
First ring switch, it is connected to the outlet line of described work preamplifier and the protection circuit of described first adjacent node, is used for when protection is switched the described outlet line of described work preamplifier being shunted to described protection circuit;
The wavelength division multiplex decomposer is used for being decomposed into wavelength optical signals by described working line from the light signal wavelength division multiplex that described first ring switch receives;
Channel modulator, be used for receive from the wavelength division multiplex decomposer and be modulated to different wave length with being fed to the through connect signal that second adjacent node goes and adding signal;
Wavelength division multiplexer is used for the signal that receives from described channel modulator is carried out wavelength division multiplexing;
Second ring switch, it is connected to the described output services circuit of described wavelength division multiplexer and the described protection circuit of described second adjacent node, is used for the described outlet line of described wavelength division multiplexer is shunted to described protection circuit;
The work booster amplifier is used for amplifying the light signal that receives by described working line from described second ring switch, and the optical signal transmission after will amplifying is given the described working line that is connected to described second adjacent node; With
The protection booster amplifier is used for amplifying the light signal that receives from described second ring switch by described protection circuit, and the optical signal transmission after will amplifying is given the described protection circuit that is connected to described first ring switch.
3. 4 optical fiber BLSR networks of claim 2 is characterized in that also comprising bridge switch in each node, and the latter is connected to the described outlet side of described work booster amplifier and the described protection circuit of described another ADM.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR61037/1998 | 1998-12-30 | ||
| KR1019980061037A KR20000044538A (en) | 1998-12-30 | 1998-12-30 | Bidirectional line switching ring network typed 4 lines in wdm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1258969A true CN1258969A (en) | 2000-07-05 |
Family
ID=19567793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99118615A Pending CN1258969A (en) | 1998-12-30 | 1999-08-30 | 4 optical fibre bidirectional circuit change ring network system in valve division multiplex system |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20000044538A (en) |
| CN (1) | CN1258969A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100346588C (en) * | 2001-10-29 | 2007-10-31 | 上海贝尔有限公司 | System of dual fibers two-way channel/multiplexing segment rotating loop for wavelength division multiplexing optical network |
| CN100353695C (en) * | 2001-04-11 | 2007-12-05 | 模式转换控股公司 | Low loss WDM add drop node |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100342426B1 (en) * | 2000-10-04 | 2002-07-03 | 윤덕용 | Automatic retrieval of wavelength-division multiplexed ring network |
| KR100411734B1 (en) * | 2001-02-12 | 2003-12-18 | 한국과학기술원 | Bidirectional wavelength division multiplexed add/drop self-healing Metro-ring network |
| KR100617752B1 (en) * | 2004-11-17 | 2006-08-28 | 삼성전자주식회사 | Bi-directional metro-access network |
| KR100703825B1 (en) * | 2005-12-08 | 2007-04-04 | 한국전자통신연구원 | A dynamic wavelength assignment method and apparatus by using 3r wavelength converters of limited wavelength conversion range |
-
1998
- 1998-12-30 KR KR1019980061037A patent/KR20000044538A/en not_active Application Discontinuation
-
1999
- 1999-08-30 CN CN99118615A patent/CN1258969A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353695C (en) * | 2001-04-11 | 2007-12-05 | 模式转换控股公司 | Low loss WDM add drop node |
| CN100346588C (en) * | 2001-10-29 | 2007-10-31 | 上海贝尔有限公司 | System of dual fibers two-way channel/multiplexing segment rotating loop for wavelength division multiplexing optical network |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20000044538A (en) | 2000-07-15 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |