CN101431376B - Dispersion compensator of ultra-high capacity optical transmission system - Google Patents
Dispersion compensator of ultra-high capacity optical transmission system Download PDFInfo
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- CN101431376B CN101431376B CN2008102368116A CN200810236811A CN101431376B CN 101431376 B CN101431376 B CN 101431376B CN 2008102368116 A CN2008102368116 A CN 2008102368116A CN 200810236811 A CN200810236811 A CN 200810236811A CN 101431376 B CN101431376 B CN 101431376B
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Abstract
The invention relates to a dispersion compensation device for an ultra-high capacity optical transmission system and a method thereof. The device consists of four compensation units, can realize fourth-order dispersion compensation for transmitting optical fiber dispersion, and simultaneously effectively compensates for transmission optical fiber because of chromatic dispersion caused by manufacturing technology and random error of chromatic dispersion gradient, thereby realizing fourth-order dispersion compensation for all band of arbitrary optical fiber types and arbitrary fiber lengths so as to carry out high precision compensation for all channels of a DWDM optical system one time. As the invention can provide ultra-high precision dispersion compensation of the high capacity DWDM transmission system higher than 100G/channel, the optical network can realize one-off upgrading and solve dispersion problems of a fiber circuit for a full due.
Description
Technical field
The present invention relates to a kind of dispersion compensator of ultra-high capacity optical transmission system.
Background technology
The dispersion compensation technology is occupied the market more than 90% based on dispersion compensating fiber (DCF) in the market. and other have optical fiber light to delete (FBG), virtual image (VIPA), electronic compensating (EDC) etc.Except that DCF, other dispersion compensation technology is the single channel compensation, the cost height, encapsulation is complicated, is not suitable for extensive use, and it is relevant with system transmissions speed, also must change simultaneously during the power system capacity upgrading, at the bottom of the DCF cost, be used widely, be one of network major technique of from 2.5G to 10G, upgrading, yet the precision that present DCF product provides have huge gap apart from 100G.The dispersion tolerance of 10G system (tolerance) is 1000ps/nm, and the dispersion tolerance of 100G system (tolerance) is 10ps/nm, little 100 times, the wavelength channel of fibre system is by itu standard ITU standard, total plate has 320 wavelength channels, all single channel products must satisfy the ITU standard, it is the high main cause of single channel product cost, and the DCF product of low precision can not adapt to needs of high capacity system, need replenishing of single channel product, thereby cause the expensive and somewhat complex design of light communication system.
The main cause that influences the fiber optic transmission system chromatic dispersion has two big classes, and the error of first manufacturing process comprises the part and dispersion compensation device (overwhelming majority the is a dispersion compensating fiber) part of delivery fiber dispersion; It two is high-order dispersion of delivery fiber dispersion, or non-linear chromatic dispersion part.Present solution rests on expensive single channel adjustable dispersion compensating technology, because what adopt all is to be Base Design with the filter, such as optical fiber light delete, virtual image array etc., all possess expensive, single channel, compensation range is limited, complicated control circuit, undercompensation or the like challenge has hindered practical application greatly.
Summary of the invention
Purpose of the present invention is in order to overcome problem and the shortcoming that above-mentioned prior art exists, a kind of dispersion compensator of ultra-high capacity optical transmission system is provided, the present invention makes full use of the characteristic of low cost, high-performance, high reliability and the full tunnel of optical fiber, in conjunction with device of the present invention, key technology and market indexs such as low cost, high accuracy, full tunnel have been realized.Manufacturing cost of the present invention and DCF are approaching, it is 1/5 to 1/10 of single channel product, and precision reaches the requirement of 100G, can compensate all passages simultaneously until the precision of 100G, and the standardization and the standardization of aspects such as network, transmission system, route, network management had great significance.
The present invention is based on the practical application of first generation extra long distance dwdm system, thousands of real network measurement result development.Network fiber has comprised the synergy of multidimensional changing factors such as time, geography, manufacturer, kind, distance, we can say that it is the same not having an optical fiber, even two optical fiber in same optical cable all are different.Fig. 1 is near the actual measured results of the North America operator Denver.The scope of dispersion variation surpasses the 20%. optical fiber dispersions distributions that are similar to Fig. 1 and also is present in other different types of optical fiber, control to the fiber cores warp when its basic reason is the optical fiber manufacturing has certain error, thereby causing the drift of zero-dispersion wavelength. this also is why the optical fiber dispersion among Fig. 1 becomes the almost reason of parallel lines. for optical fiber G.652,20% distance that means every 80km has the variation of 272ps/nm.This 100G system that tolerance limit is had only 10ps/nm considerably beyond.
Optical fiber dispersion can be with following formulate
D(λ)＝D(λ
0)+S*(λ-λ
0)+H*(λ-λ
0)
2+...(1)
Wherein D is chromatic dispersion, and λ is a wavelength, and S is a chromatic dispersion gradient, and H is the fourth-order dispersion coefficient, λ
0Be a certain wavelength, not necessarily zero-dispersion wavelength.The unit of chromatic dispersion is ps/nm/km normally, and what equation (1) was represented is abbe number, both the dispersion values of unit length.The chromatic dispersion of Transmission Fibers represents with Dt, and the chromatic dispersion of i compensating device represents with Di, the requirement of dispersion compensation be total chromatic dispersion in whole interested wave band, such as the C-band of ITU standard, L-band, or other wave band are zero, are formulated as follows:
Dt(λ
0)*Lt+D
1L
1+D
2L
2+D
3L
3+D
4L
4+...＝0 (2)
St(λ
0)*Lt+S
1L
1+S
2L
2+S
3L
3+S
4L
4+...＝0 (3)
Ht(λ
0)*Lt+H
1L
1+H
2L
2+H
3L
3+H
4L
4+...＝0 (4)
Here D, S and H are at λ
0The optical fiber dispersion of wavelength, chromatic dispersion gradient and fourth-order dispersion parameter value have omitted λ for convenient meter in the formula
0As seen from Figure 1, it is identical almost not having an optical fiber, if go compensation or design according to equation (2-4), needs then to be compensator of each root optical fiber designs that this obviously is unpractical, although possible in theory.Yet the variation of actual fiber chromatic dispersion has its feature, and this also is the foundation that classification of the present invention progressively compensates.Fig. 1 and other a large amount of actual measured results show that the overwhelming majority (90%) that optical fiber dispersion distributes is linear from the drift of zero wavelength basically, and remaining non-linear partial is only less than 10%.What Fig. 2 represented is that the actual fiber chromatic dispersion is compensating the residual dispersion behind the linear segment, and what curve 1 was represented is the H item, and just the fourth-order dispersion of traditional definition is parabolic shape substantially, and curve 2 expressions is the later more high-order of H item compensation.Note curve 2 is the numerical value after having amplified 100 times, and residual dispersion is less than 0.01ps/nm.This shows that chromatic dispersion is required light communication system for the 100G OOK modulation of＜10ps/nm, and it is just enough to compensate to H item or quadravalence.
Technical scheme of the present invention is:
A kind of dispersion compensator of ultra-high capacity optical transmission system is made up of four compensating units, it is characterized in that: per two compensating units are connected into an integral device, and two devices that will be connected into integral device again insert in the optical fibre channel that will compensate.Realize a certain by the compensation of the quadravalence of the chromatic dispersion of compensated fiber, in other words to being compensated simultaneously by the dispersion parameters of adjusting four compensating units by the non-linear chromatic dispersion of the chromatic dispersion of compensated fiber, chromatic dispersion gradient and quadravalence.
The dispersion parameters D of first, second two compensating units in described four compensating units
1, D
2, S
1, S
2, L
1, L
2Selection to make Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2), then Dt, St are by the chromatic dispersion of compensated fiber and chromatic dispersion gradient, D
1, D
2, S
1, S
2, L
1, L
2Be respectively chromatic dispersion, chromatic dispersion gradient and the length parameter of first, second compensating unit, can be compensated simultaneously by the chromatic dispersion of compensated fiber and chromatic dispersion gradient.
The dispersion parameters D of first, second two compensating units in described four compensating units
1, D
2, S
1, S
2, satisfy relation of plane D down
1/ S
1=(Dt/St) (1-Δ), D
2/ S
2=(Dt/St) (1+ Δ), wherein Δ is the design parameter less than 1, so at D
1, D
2, S
1, S
2, L
1, L
2Satisfy Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2) condition under, first, second compensating unit can be in compensation by the ratio of the chromatic dispersion of compensated fiber and chromatic dispersion gradient at D
1/ S
1=(Dt/St) (1-Δ) is with D
2/ S
2=(Dt/St) arbitrary value between (1+ Δ); In other words, by adjusting L
1, L
2Ratio, satisfying Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2) condition under, select D
1, D
2, S
1, S
2, beyond by the technology of compensated fiber dispersion parameters or statistical error scope, can be in compensation of dispersion, chromatic dispersion gradient, the technology or the statistical error of compensation of dispersion parameter in a scope of design.
The dispersion parameters of the 3rd, the 4 two compensating unit satisfies S in described four compensating units
r=S
3* L
3, H
r=H
4* L
4Condition under, can compensate S to nonlinear fourth-order dispersion component
3, H
4, L
3, L
4, S
3Be the residual dispersion slope of the 3rd compensating unit, H
4Be the fourth-order dispersion coefficient of the 4th compensating unit, L
3, L
4Then be the surplus length parameter of third and fourth compensating unit, S
rBy the residual dispersion slope of compensated fiber, H
rBy the fourth-order dispersion coefficient of compensated fiber.
If adjust the dispersion parameters D of first, second two compensating units in four compensating units simultaneously
1, D
2, S
1, S
2, L
1, L
2Satisfy Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2); Or the dispersion parameters of first, second two compensating units satisfies relation of plane D down
1/ S
1=(Dt/St) (1-Δ), D
2/ S
2=(Dt/St) (1+ Δ), wherein Δ is the design parameter less than 1, by adjusting L
1, L
2Ratio, satisfying Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2) condition under; The dispersion parameters of the 3rd, the 4 two compensating unit satisfies S simultaneously
r=S
3* L
3, H
r=H
4* L
4Condition under, thereby the compensation by the chromatic dispersion of compensated fiber, chromatic dispersion gradient, the non-linear dispersive component of fabrication error and 4 rank.Use under the condition of the compensated fiber below four kinds or four kinds, can carry out full remuneration, compensate to quadravalence to the optical fiber dispersion that changes in the certain limit.
A kind of ultra-high capacity optical transmission system dispersion compensation method, carry out according to the following steps: (1) compensates by the linear segment of compensated fiber with the dispersion compensation device or the dispersion compensating fiber of two series connection, compensates the statistics branch of different fiber dispersion parameters simultaneously; (2) dispersion compensation device or the dispersion compensating fiber with two series connection compensates by the trickle correction of compensated fiber quadravalence;
The compensation principle of the first step can be with the The Representation Equation of following simplification, Dt (λ
0) * Lt+D
1L
1+ D
2L
2+ [St (λ
0) * Lt+S
1L
1+ S
2L
2] * (λ-λ
0)=0 (5)
Equation (5) further can become Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2) (6)
Wherein, Dt, St be by the chromatic dispersion of compensated fiber, chromatic dispersion gradient parameter, D
1, D
2, S
1, S
2, L
1, L
2Then be the chromatic dispersion of first and second compensating unit, chromatic dispersion gradient, length parameter;
Equation (6) has following meaning: if the optical fiber Dt/St that is compensated is constant, then adjust L
1Or L
2, then theoretical the preceding paragraph compensator is just enough, if changed by compensated fiber or the parameter of compensated fiber own, so by adjusting L
1Or L
2Size just can satisfy the requirement of (6).In the Compensation Design, the parameter of compensating unit, D
1, D
2, S
1, S
2, can be selected in the certain limit up and down of average Dt/St value, then can compensate any optical fiber dispersion in this scope, that is to say
D
1/S
1＝(Dt/St)(1+/-Δ)，D
2/S
2＝(Dt/St)(1+/-Δ) (7)
Δ is the design parameter less than 1, and the selection of its size is a foundation with the excursion that satisfies optical fiber parameter.Suitable selection Δ can compensate simultaneously by the intrinsic chromatic dispersion and the fabrication error of compensated fiber, can also remedy the fabrication error of compensating unit itself, thereby guarantee just can compensate the purpose of any optical fiber, and do not need compensating unit for a coupling of each root optical fiber designs with a spot of compensating unit;
Second step was the trickle correction of quadravalence, and for the transmission photosystem of ultra-high capacity, the quadravalence compensation has great importance, and the remainder after the first step compensation is made up of two-part usually,
D
r＝S
r*λ+H
r*λ
2 (8)
S
r, H
rFor by compensated fiber residual dispersion slope and fourth-order dispersion coefficient.This shows that the compensating unit in second step needs D
3, D
4Have following characteristic,
D
3＝S
3*λ (9)
D
4＝H
4*λ
2 (10)
Select suitable compensated fiber length, make
S
r＝S
3*L
3 (11)
H
r＝H
4*L
4 (12)
D
3, D
4Be respectively the chromatic dispersion of third and fourth compensating unit, S
3The residual dispersion slope of the 3rd compensating unit, H
4The fourth-order dispersion coefficient of the 4th compensating unit, L
3, L
4It then is the length parameter of third and fourth compensating unit.Then can finish compensation to the residue high-order dispersion.
The present invention does not need again laying optical fiber, only need device of the present invention to be inserted in the optical fibre channel at selected central machine room, superhigh precision compensation up to the 100G/ passage just can be provided, and optical-fiber network can be realized disposable upgrading, the chromatic dispersion problem of the solution fibre circuit of putting things right once and for all.And present solution is excessive property basically, and the bulk weight that all needs to check colors of system speed-raising each time newly compensates.The cycle of system upgrade does not thoroughly solve chromatic dispersion problem greatly about 5-7, and new system just must constantly drop into, and causes repetition and waste.
The present invention has following characteristic: (1) has effectively compensated the error of optic fibre manufacture process; (2) compensation technique has been considered the fabrication error of compensating device itself simultaneously; (3) very low cost; (4) full tunnel high-order dispersion compensation; (5) passive, need not any circuit control; (6) superhigh precision dispersion compensation; (7) the disposable upgrading of optical fiber.
Description of drawings
Fig. 1 is North America optical fiber dispersion actual measured results figure.
Fig. 2 is that the actual fiber chromatic dispersion is at compensated linear part back residual dispersion figure.
Fig. 3 is a schematic representation of apparatus of the present invention.
Fig. 4 is an actual fiber Compensation Design schematic diagram of the present invention.
Embodiment
A kind of dispersion compensator of ultra-high capacity optical transmission system is made up of four compensating units, it is characterized in that: per two compensating units are connected into an integral device, and two devices that will be connected into integral device again insert in the selected optical fibre channel of central machine room.Realize a certain by the compensation of the quadravalence of the chromatic dispersion of compensated fiber, in other words to being compensated simultaneously by the dispersion parameters of adjusting four compensating units by the non-linear chromatic dispersion of the chromatic dispersion of compensated fiber, chromatic dispersion gradient and quadravalence.
The dispersion parameters D of first, second two compensating units in described four compensating units
1, D
2, S
1, S
2, L
1, L
2Selection to make Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2), then Dt, St are by the chromatic dispersion of compensated fiber and chromatic dispersion gradient, can be compensated simultaneously by the chromatic dispersion of compensated fiber and chromatic dispersion gradient.
The dispersion parameters D of first, second two compensating units in described four compensating units
1, D
2, S
1, S
2, satisfy relation of plane D down
1/ S
1=(Dt/St) (1-Δ), D
2/ S
2=(Dt/St) (1+ Δ), wherein Δ is the design parameter less than 1, so at D
1, D
2, S
1, S
2, L
1, L
2Satisfy Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2) condition under, first, second compensating unit can be in compensation by the ratio of the chromatic dispersion of compensated fiber and chromatic dispersion gradient at D
1/ S
1=(Dt/St) (1-Δ) is with D
2/ S
2=(Dt/St) arbitrary value between (1+ Δ); In other words, by adjusting L
1, L
2Ratio, satisfying Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2) condition under, select D
1, D
2, S
1, S
2, beyond by the technology of compensated fiber dispersion parameters or statistical error scope, can be in compensation of dispersion, chromatic dispersion gradient, the technology or the statistical error of compensation of dispersion parameter in a scope of design.
The dispersion parameters of the 3rd, the 4 two compensating unit satisfies S in described four compensating units
r=S
3* L
3, H
r=H
4* L
4Condition under, can compensate S to nonlinear fourth-order dispersion component
3, H
4, L
3, L
4, S
3Be the residual dispersion slope of the 3rd compensating unit, H
4Be the fourth-order dispersion coefficient of the 4th compensating unit, L
3, L
4Then be the surplus length parameter of third and fourth compensating unit, S
rBy the residual dispersion slope of compensated fiber, H
rBy the fourth-order dispersion coefficient of compensated fiber.
If adjust the dispersion parameters D of first, second two compensating units in four compensating units simultaneously
1, D
2, S
1, S
2, L
1, L
2Satisfy Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2); Or the dispersion parameters of first, second two compensating units satisfies relation of plane D down
1/ S
1=(Dt/St) (1-Δ), D
2/ S
2=(Dt/St) (1+ Δ), wherein Δ is the design parameter less than 1, by adjusting L
1, L
2Ratio, satisfying Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2) condition under; The dispersion parameters of the 3rd, the 4 two compensating unit satisfies S simultaneously
r=S
3* L
3, H
r=H
4* L
4Condition under, thereby the compensation by the chromatic dispersion of compensated fiber, chromatic dispersion gradient, the non-linear dispersive component of fabrication error and 4 rank.Use under the condition of the compensated fiber below four kinds or four kinds, can carry out full remuneration, compensate to quadravalence to the optical fiber dispersion that changes in the certain limit.
A kind of ultra-high capacity optical transmission system dispersion compensation method, carry out according to the following steps: (1) compensates by the linear segment of compensated fiber with the dispersion compensation device or the dispersion compensating fiber of two series connection, compensates the statistics branch of different fiber dispersion parameters simultaneously; (2) dispersion compensation device or the dispersion compensating fiber with two series connection compensates by the trickle correction of compensated fiber quadravalence;
The compensation principle of the first step can be with the The Representation Equation of following simplification, Dt (λ
0) * Lt+D
1L
1+ D
2L
2+ [St (λ
0) * Lt+S
1L
1+ S
2L
2] * (λ-λ
0)=0 (5)
Equation (5) further can become Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2) (6)
Wherein, Dt, St be by the chromatic dispersion of compensated fiber, chromatic dispersion gradient parameter, D
1, D
2, S
1, S
2, L
1, L
2Then be the chromatic dispersion of first and second compensating unit, chromatic dispersion gradient, length parameter;
Equation (6) has following meaning: if the optical fiber Dt/St that is compensated is constant, then adjust L
1Or L
2, then theoretical the preceding paragraph compensator is just enough, if changed by compensated fiber or the parameter of compensated fiber own, so by adjusting L
1Or L
2Size just can satisfy the requirement of (6).In the Compensation Design, the parameter of compensating unit, D
1, D
2, S
1, S
2, can be selected in the certain limit up and down of average Dt/St value, then can compensate any optical fiber dispersion in this scope, that is to say
D
1/S
1＝(Dt/St)(1+/-Δ)，D
2/S
2＝(Dt/St)(1+/-Δ) (7)
Δ is the design parameter less than 1, and the selection of its size is a foundation with the excursion that satisfies optical fiber parameter.Suitable selection Δ can compensate simultaneously by the intrinsic chromatic dispersion and the fabrication error of compensated fiber, can also remedy the fabrication error of compensating unit itself, thereby guarantee just can compensate the purpose of any optical fiber, and do not need compensating unit for a coupling of each root optical fiber designs with a spot of compensating unit;
Second step was the trickle correction of quadravalence, and for the transmission photosystem of ultra-high capacity, the quadravalence compensation has great importance, and the remainder after the first step compensation is made up of two-part usually,
D
r＝S
r*λ+H
r*λ
2 (8)
S
r, H
rFor by compensated fiber residual dispersion slope and fourth-order dispersion coefficient.This shows that the compensating unit in second step needs D
3, D
4Have following characteristic,
D
3＝S
3*λ (9)
D
4＝H
4*λ
2 (10)
Select suitable compensated fiber length, make
S
r＝S
3*L
3 (11)
H
r＝H
4*L
4 (12)
D
3, D
4Be respectively the chromatic dispersion of third and fourth compensating unit, S
3The residual dispersion slope of the 3rd compensating unit, H
4The fourth-order dispersion coefficient of the 4th compensating unit, L
3, L
4It then is the length parameter of third and fourth compensating unit.Then can finish compensation to the residue high-order dispersion.
Claims (2)
1. a dispersion compensator of ultra-high capacity optical transmission system is made up of four compensating units, it is characterized in that: per two compensating units are connected into an integral device, and two devices that will be connected into integral device again insert in the optical fibre channel that will compensate; The dispersion parameters D of first, second two compensating units in described four compensating units
1, D
2, S
1, S
2, L
1, L
2Selection to make Dt/St=(D
1L
1+ D
2L
2)/(S
1L
1+ S
2L
2), then Dt, St are by the chromatic dispersion of compensated fiber and chromatic dispersion gradient, D
1, D
2, S
1, S
2, L
1, L
2Be respectively chromatic dispersion, chromatic dispersion gradient and the length parameter of first, second compensating unit; The dispersion parameters of the 3rd, the 4 two compensating unit satisfies S in described four compensating units
r=S
3* L
3, H
r=H
4* L
4, S
3Be the residual dispersion slope of the 3rd compensating unit, H
4Be the fourth-order dispersion coefficient of the 4th compensating unit, L
3, L
4Then be the length parameter of third and fourth compensating unit, S
rBy the residual dispersion slope of compensated fiber, H
rBy the fourth-order dispersion coefficient of compensated fiber.
2. dispersion compensator of ultra-high capacity optical transmission system according to claim 1 is characterized in that: the dispersion parameters D of first, second two compensating units in described four compensating units
1, D
2, S
1, S
2, satisfy relation of plane D down
1/ S
1=(Dt/St) (1-Δ), D
2/ S
2=(Dt/St) (1+ Δ), wherein Δ is the design parameter less than 1.
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|---|---|---|---|
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|---|---|---|---|
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| CN101431376B true CN101431376B (en) | 2011-07-20 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1492247A (en) * | 2002-09-30 | 2004-04-28 | Fitel | Dispersion compensation module |
| CN101202592A (en) * | 2006-11-03 | 2008-06-18 | 德雷卡通信技术公司 | Chromatic dispersion compensating fiber |
| CN101207446A (en) * | 2006-12-20 | 2008-06-25 | 日立通讯技术株式会社 | Dispersion compensator, optical transmission system and optical transmission method |
-
2008
- 2008-12-12 CN CN2008102368116A patent/CN101431376B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1492247A (en) * | 2002-09-30 | 2004-04-28 | Fitel | Dispersion compensation module |
| CN101202592A (en) * | 2006-11-03 | 2008-06-18 | 德雷卡通信技术公司 | Chromatic dispersion compensating fiber |
| CN101207446A (en) * | 2006-12-20 | 2008-06-25 | 日立通讯技术株式会社 | Dispersion compensator, optical transmission system and optical transmission method |
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