CN101179338A - Large dispersion compensating method of optical transmission system - Google Patents
Large dispersion compensating method of optical transmission system Download PDFInfo
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- CN101179338A CN101179338A CN 200610138664 CN200610138664A CN101179338A CN 101179338 A CN101179338 A CN 101179338A CN 200610138664 CN200610138664 CN 200610138664 CN 200610138664 A CN200610138664 A CN 200610138664A CN 101179338 A CN101179338 A CN 101179338A
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Abstract
The invention discloses a large dispersion amount compensation method, which relates to the technical field of the optical transmission. The invention is invented in order to simplify the system design and lower the construction cost. The method is mainly characterized in that of all the optical line amplification nodes, most of the line amplification nodes only accomplish power amplification anterior link loss compensation function except for the nodes with dispersion compensation function. The optical line amplification nodes with dispersion compensation function or the optical receiving nodes accomplish anterior link loss compensation and at the same time centralize to compensate dispersion of the front sections of links with a dispersion compensation amount of over 2,720ps/nm at a time. Nodes at the receiving terminal can adopt multiplex section dispersion compensation or the optical path electric dispersion compensation as well, with a dispersion compensation amount of over 2,720ps/nm. The method is especially suitable for the application situation of 2.5Gb/s WDM optical fiber transmission system upgrading to the 10Gb/s WDM optical fiber transmission system.
Description
Technical field
The present invention relates to the optical transport technology field, relate in particular to the dispersion compensation realization technology of optical transmission system.
Background technology
Along with the quick growth of society to communication requirement, close wavelength-division multiplex technology (DWDM) developed rapidly in recent years, and 40 * 10Gb/s and the positive large-scale application of 160 * 10Gb/s wavelength-division multiplex system are in metropolitan area network and backbone network.In big capacity optical transmission system, how the compensated line chromatic dispersion is one of technical barrier that emphasis solves in the system design.
By checking relevant chromatic dispersion optimized light-guide patent, from the port number of handling, dispersion compensation can be divided into single channel dispersion compensation technology and multiplex section dispersion compensation technology two classes, often two kinds of cooperations during specific implementation.Single channel dispersion compensation technology can advance generally to be divided into two kinds of electrical dispersion compensation and light territory dispersion compensations again, light territory single channel dispersion compensation generally adopts Fiber Bragg Grating technology, concrete patent such as US2004091272, GB2355610, US6476950, EP1130829A2, EP1030472A2, EP0954127A2 etc.; Also there is relevant patent (as WO0239625A2, JP2003060574A etc.) to relate to prechirp and dispersion compensation cooperation; Relevant in addition publication (as: WO2004032385, WO9403987A1, US5526159 etc.) relates to single channel electrical dispersion compensation technology.(relevant patent is seen: US6674557 in the distributed dispersion compensation technology of the general employing of multiplex section dispersion compensation, US6570691 etc.), so-called distributed dispersion compensation technology promptly compensates certain chromatic dispersion in advance at transmitting terminal, circuit amplifies node and compensates the certain chromatic dispersion of leading portion circuit step by step, the mode that receiving terminal carries out certain back dispersion compensation realizes circuit chromatic dispersion and dispersion slope compensation to guarantee the smooth received signal of optical receiver, these patents difference slightly when specific implementation, but starting point all is to consider how to realize that meticulous dispersion compensation is to realize the farther of jumbo system transmissions.
The circuit that carries out dispersion compensation in actual engineering amplifies in the node, the dispersion measure of the application system compensation of each producer is generally at 40km to 120km, cause nearly all node all will carry out dispersion compensation like this, the kind of producer's dispersion compensation also requires a lot, circuit amplifies also more complicated of node configuration, whole system construction cost height, particularly for the 2.5Gb/s wdm system to 10Gb/s WDM upgrading circuit, often will all the amplification nodes in the system be redesigned, the system upgrade cost is very high.
By patent retrieval, mention G655 optical fiber multi-span chromatic dispersion accumulation back centralized compensation method at patent WO0241535, and propose corresponding EDFA/Raman mixed light and amplify design of node, it mainly is because G.655 the optical fiber dispersion coefficient is little that this method can be adopted, and the accumulated chromatic dispersion of (as 300km) system neither be very big behind the accumulation multistage.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method of optical transmission system large dispersion compensating, can simplify the design of optical transmission system and reducings the construction costs.
For solving the problems of the technologies described above, the technical scheme that the method for a kind of large dispersion compensating of the present invention adopts comprises step:
(1) transmitting terminal of optical transmission system carries out chromatic dispersion and mends in advance;
(2) the small part intermediate light circuit of optical transmission system amplification node has chromatic dispersion compensating function, intermediate light circuit with chromatic dispersion compensating function amplifies node, when finishing power amplification compensation prime link load, concentrate chromatic dispersion to compensate to its several sections links in front;
(3) the light-receiving node of optical transmission system concentrates the chromatic dispersion to its several sections links in front to compensate when finishing power amplification compensation prime link load.Wherein,
Described step (2) is specially:
(21A) the one-level image intensifer with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the one-level power amplification;
(22A) the firsts and seconds dispersion compensation device with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the firsts and seconds dispersion compensation respectively;
(23A) the secondary light amplifier with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the secondary power amplification.
Described step (2) also is specially:
(21B) the one-level dispersion compensation device with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the one-level dispersion compensation;
(22B) the one-level image intensifer with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the one-level power amplification;
(23B) the secondary dispersion compensation device with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the secondary dispersion compensation;
(24B) the secondary light amplifier with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the secondary power amplification.
Described step (3) is specially:
(31A) the one-level image intensifer of light-receiving node is finished the one-level power amplification;
(32A) the firsts and seconds dispersion compensation device of light-receiving node is finished the firsts and seconds dispersion compensation respectively;
(33A) the secondary light amplifier of light-receiving node is finished the secondary function amplification.
Described step (3) also is specially:
(31B) the one-level dispersion compensation device of light-receiving node is finished the one-level dispersion compensation;
(32B) the one-level image intensifer of light-receiving node is finished the one-level power amplification;
(33B) the secondary dispersion compensation device of light-receiving node is finished the secondary dispersion compensation;
(34B) the secondary light amplifier of light-receiving node is finished the secondary power amplification.
Described step (3) is specially again:
(31C) image intensifer of light-receiving node is finished power amplification;
(32C) channel-splitting filter of light-receiving node carries out partial wave;
(33C) the reception OUT of light-receiving node finishes dispersion compensation.
The dispersion measure that the intermediate light circuit that the method for above-mentioned optical transmission system large dispersion compensating, light-receiving node and each have a chromatic dispersion compensating function amplifies the node compensation is all greater than the G.652 optical fiber dispersion amount of 160km.
Preferably, described method can be used in combination with the method that existing optical link amplification node power compensates and dispersion compensation is finished simultaneously.
Compared with prior art, adopt the method for a kind of optical transmission system large dispersion compensating of the present invention, owing to amplify in the node at optical link, except having the node of chromatic dispersion compensating function, most of circuit amplifies node and only finishes power amplification compensation prime link load function, like this, both simplified optical transmission system light amplification node configuration, reduce light amplification node cost, and then reduction system construction cost, realize easily that again the 2.5Gb/s wdm system to 10Gb/s wdm system upgrading, changes all light amplification nodes when avoiding upgrading, general only need transform to the circuit node up and down of interpole minority and light-receiving node just realize upgrading.
Description of drawings
Shown in Figure 1 is traditional wdm system schematic diagram;
Shown in Figure 2 is traditional circuit amplifier architecture composition diagram;
Shown in Figure 3 is large dispersion compensating optical transmission system schematic diagram;
Shown in Figure 4 is that the large dispersion compensating circuit amplifies the node structure schematic diagram;
Shown in Figure 5 is receiving device large dispersion compensating structural representation;
Shown in Figure 6 is a kind of reception OTU veneer illustrative view of functional configuration of the EDC of having function;
Shown in Figure 7 is the moderate distance transmission system that adopts large dispersion compensating.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
In conjunction with the current techniques current situation, the present invention breaks through the restriction of meticulous multiple step format dispersion compensation tradition thinking, has proposed a kind of method of large dispersion compensating, mainly is a kind of dispersion compensation method that proposes at fiber optic transmission system G.652.
Be different from the nearly all optical link of traditional optical transmission system circuit and amplify the method that node power compensates and dispersion compensation is finished simultaneously, the main feature of method that the present invention proposes is:
(1) amplify node at optical link, except having the node of chromatic dispersion compensating function, most of circuit amplifies node and only finishes power amplification compensation prime link load function; Optical link amplification node or light-receiving node with chromatic dispersion compensating function concentrate the chromatic dispersion to several sections links in front to compensate when finishing compensation prime link load, and the dispersion measure of disposable compensation surpasses 2720ps/nm (greater than the G.652 optical fiber dispersion amount of 160km).
(2) can adopt multiplex section dispersion compensation mode at receiving terminal node, also can adopt the optical channel electrical dispersion compensation, the dispersion measure of compensation surpasses 2720ps/nm (greater than the G.652 optical fiber dispersion amount of 160km).
(3) system is when the configuration optical link amplifies node, and node structure will be simplified, and configuration will be more reasonable, and the whole system design also will be simplified greatly.
The present invention has broken through the thought that traditional optical transmission system dispersion compensation and power back-off are almost carried out simultaneously, having proposed in the optical link node most of circuit amplifies node and only carries out power back-off, amplify node or optical receiving device node at optical link with chromatic dispersion compensating function, except the loss of compensation leading portion circuit, also adopt dispersion compensation device to several sections circuit chromatic dispersions in front centralized compensation.
Amplify node at optical link, described dispersion compensation device generally is a dispersion compensating fiber, and at optical receiving end equipment, described dispersion compensation device can be a dispersion compensating fiber, also can be single channel electrical dispersion compensation device EDC.
Fig. 1 is traditional WDM optical transmission system schematic diagram, generally form by sending ending equipment, transmission link, optical link amplification node, optical receiving end equipment, dispersion compensation in the system generally adopts a certain amount of pre-benefit at transmitting terminal, circuit amplifies the chromatic dispersion that node generally compensates the leading portion circuit step by step, and optical receiving end carries out a certain amount of back according to the chromatic dispersion of whole system and mends.
Fig. 2 is that traditional optical link amplifies node, generally forms structure for two kinds by (a) and (b), and (a) optical link of structure amplification node generally is applicable to the bigger occasion of leading portion optical link Insertion Loss, amplifies by two-stage, adopts dispersion compensation device in the middle of two amplifiers; (b) optical link of structure amplification node is applicable to the less occasion of leading portion circuit light Insertion Loss.See that comprehensively traditional optical transmission system is followed every 40km to 120km basically and carried out dispersion compensation, so almost each light amplification node is finished dispersion compensation and light amplification simultaneously.
Shown in Figure 3 is the optical transmission system schematic diagram that adopts large dispersion compensating method of the present invention, and as shown in the figure, this system is except having a certain amount of pre-dispersion compensation-D at transmitting terminal
TOutward, optical link amplifies node i, optical link amplifies node j... and optical receiving end is the node with chromatic dispersion compensating function.The chromatic dispersion of supposing optical transmission chain 1, optical transmission chain 2...... optical transmission chain i, optical transmission chain j...., optical transmission chain N is respectively D
1, D
2... ..D
i, D
j... ..D
N, the chromatic dispersion compensation quantity that amplifies node i, j and optical receiving end equipment R at optical link is respectively-D
Ni,-D
Nj,-D
NR..
It is as follows to adopt the large dispersion compensating method to learn expression formula with concrete offset value:
D
1+ D
2+ ...+D
i-D
Ni≈ 0; (D wherein
Ni＞2720ps/nm)
D
I+1+ D
I+2+ ...+D
j-D
Nj≈ 0; (D wherein
Nj＞2720ps/nm)
..
..
D
K+1+ D
K+2+ ...+D
N-1-D
NR≈ 0; (D wherein
NR＞2720ps/nm)
In addition, the circuit residual dispersion amount of whole system will satisfy requirement of system design.
As shown in Figure 4, the optical link of large dispersion compensating amplifies node structure generally two kinds of structures (a) and (b), and (a) optical link of structure amplification node is applicable to that the leading portion circuit grows (about 80km), the occasion that Insertion Loss is bigger; (b) optical link of structure amplification node is applicable to leading portion line length moderate (about 50km), the occasion that Insertion Loss is less.
As shown in Figure 5, the optical receiving end equipment of large dispersion compensating generally also has two kinds of compensation ways, a kind of is multiplex section dispersion compensation mode, shown in Fig. 5 (b), (c), it is similar that this compensation configuration and optical link amplify node, another kind is a single channel electricity chromatic dispersion EDC compensation way, adopts the EDC technology directly the circuit chromatic dispersion to be compensated (shown in Fig. 5 (a)) in receiving OTU, and this technology is specially adapted to the SDH system.
Shown in Figure 6 is the reception OTU illustrative view of functional configuration with EDC electrical dispersion compensation, as shown in the figure, chromatic dispersion causes the light signal of signal broadening to enter the receiver side of the integrated module of optical transceiver, finish photoelectricity O/E conversion and stride the resistance amplification by PIN or APD earlier and enter EDC, CDR and DEMUX functional unit through TLA, 16 road LVDS data behind this functional unit demultiplexing enter the fec decoder module, data before the decoding and error calculate the preceding error rate of error correction, and this error rate data loopback EDC, CDR and DEMUX functional unit are used for the feedback information that EDC adjusts; All the other B1, J0 monitoring function module, AD/DA conversion functional module, optical transmission module and the control information of corresponding C PU minimum system enable as laser, and biasing control etc. are identical with traditional reception OTU functional structure.
Shown in Figure 7 is a point-to-point optical transmission system that always is about 200km, this system carries out a certain amount of chromatic dispersion and mends in advance in sending ending equipment, middle all optical links amplify node and do not carry out dispersion compensation, after receiving terminal is through amplification and partial wave, the chromatic dispersion of each passage adopts the electrical dispersion compensation technology to finish in OTU, to guarantee that receiver normally receives judgement.
Adopt dispersion compensation method provided by the invention when practical application, can adopt the mode that combines with traditional dispersion compensation method.Promptly part section of striding and amplification node adopt traditional dispersion compensation mode, and part section of striding (several) and amplification node adopt the method for large dispersion compensating, can satisfy the various application demands of existing network by the combination of two kinds of methods.
The present invention is applicable to G.652 fiber optic transmission system, 10Gb/s SDH fiber optic transmission system G.652 of various modulation format 10Gb/s WDM, is specially adapted to 2.5Gb/s WDMG.652 fiber optic transmission system to the 10Gb/s WDM application scenario of fiber optic transmission system upgrading G.652; Original technical scheme reduces upgrade cost greatly upgrading and can only the redesign of light amplification node being adopted the inventive method to significantly reduce workload is changed in the design of optical link node; The present invention simultaneously also is applicable to the G.655 various application scenarios of fiber optic transmission system.
Claims (8)
1. the method for an optical transmission system large dispersion compensating is characterized in that, comprises step:
(1) transmitting terminal of optical transmission system carries out chromatic dispersion and mends in advance;
(2) the small part intermediate light circuit of optical transmission system amplification node has chromatic dispersion compensating function, intermediate light circuit with chromatic dispersion compensating function amplifies node, when finishing power amplification compensation prime link load, concentrate chromatic dispersion to compensate to its several sections links in front;
(3) the light-receiving node of optical transmission system concentrates the chromatic dispersion to its several sections links in front to compensate when finishing power amplification compensation prime link load.
2. the method for optical transmission system large dispersion compensating according to claim 1 is characterized in that,
Described step (2) is specially:
(21A) the one-level image intensifer with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the one-level power amplification;
(22A) the firsts and seconds dispersion compensation device with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the firsts and seconds dispersion compensation respectively;
(23A) the secondary light amplifier with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the secondary power amplification.
3. want the method for 1 described optical transmission system large dispersion compensating according to right, it is characterized in that,
Described step (2) is specially:
(21B) the one-level dispersion compensation device with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the one-level dispersion compensation;
(22B) the one-level image intensifer with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the one-level power amplification;
(23B) the secondary dispersion compensation device with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the secondary dispersion compensation;
(24B) the secondary light amplifier with intermediate light circuit amplification node of chromatic dispersion compensating function is finished the secondary power amplification.
4. the method for optical transmission system large dispersion compensating according to claim 1 is characterized in that,
Described step (3) is specially:
(31A) the one-level image intensifer of light-receiving node is finished the one-level power amplification;
(32A) the firsts and seconds dispersion compensation device of light-receiving node is finished the firsts and seconds dispersion compensation respectively;
(33A) the secondary light amplifier of light-receiving node is finished the secondary function amplification.
5. the method for optical transmission system large dispersion compensating according to claim 1 is characterized in that,
Described step (3) is specially:
(31B) the one-level dispersion compensation device of light-receiving node is finished the one-level dispersion compensation;
(32B) the one-level image intensifer of light-receiving node is finished the one-level power amplification;
(33B) the secondary dispersion compensation device of light-receiving node is finished the secondary dispersion compensation;
(34B) the secondary light amplifier of light-receiving node is finished the secondary power amplification.
6. the method for optical transmission system large dispersion compensating according to claim 1 is characterized in that,
Described step (3) is specially:
(31C) image intensifer of light-receiving node is finished power amplification;
(32C) channel-splitting filter of light-receiving node carries out partial wave;
(33C) the reception OUT of light-receiving node finishes dispersion compensation.
7. according to the method for the described optical transmission system large dispersion compensating of arbitrary claim in the claim 1 to 6, it is characterized in that the dispersion measure that the intermediate light circuit that light-receiving node and each have a chromatic dispersion compensating function amplifies the node compensation is all greater than the G.652 optical fiber dispersion amount of 160km.
8. the method for optical transmission system large dispersion compensating according to claim 7 is characterized in that, described method can be amplified the method that node power compensates and dispersion compensation is finished simultaneously with existing optical link and is used in combination.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102308499A (en) * | 2009-02-04 | 2012-01-04 | 日本电气株式会社 | Optical communication system and optical communication method |
| CN102571202A (en) * | 2012-03-08 | 2012-07-11 | 大连大学 | Laser link loss calculating method under complex weather |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6674557B1 (en) * | 1998-09-21 | 2004-01-06 | Corning Incorporated | Wavelength division multiplexing systems |
| JP2002525967A (en) * | 1998-09-21 | 2002-08-13 | コーニング インコーポレイテッド | Wavelength division multiplexing system |
| CN1783757A (en) * | 2004-11-30 | 2006-06-07 | 中兴通讯股份有限公司 | Dispersion compensator of dense wave division multiplex system |
-
2006
- 2006-11-10 CN CN 200610138664 patent/CN101179338B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102308499A (en) * | 2009-02-04 | 2012-01-04 | 日本电气株式会社 | Optical communication system and optical communication method |
| US8909060B2 (en) | 2009-02-04 | 2014-12-09 | Nec Corporation | Optical communication system and optical communication method |
| CN102308499B (en) * | 2009-02-04 | 2015-01-21 | 日本电气株式会社 | Optical communication system and optical communication method |
| CN102571202A (en) * | 2012-03-08 | 2012-07-11 | 大连大学 | Laser link loss calculating method under complex weather |
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