CN2517184Y - Optical transmission system - Google Patents
Optical transmission system Download PDFInfo
- Publication number
- CN2517184Y CN2517184Y CN 01279962 CN01279962U CN2517184Y CN 2517184 Y CN2517184 Y CN 2517184Y CN 01279962 CN01279962 CN 01279962 CN 01279962 U CN01279962 U CN 01279962U CN 2517184 Y CN2517184 Y CN 2517184Y
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- China
- Prior art keywords
- optical
- transmission
- optical transmission
- module
- transmission system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/2525—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
- H04B10/25253—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres with dispersion management, i.e. using a combination of different kind of fibres in the transmission system
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The utility model relates to an optical transmission system, which mainly comprises sequential connected optical signal emission module; a plurality of optical transmission segments; optical signal receiving module, the utility model is characterized in that the optical transmission segments comprise at least a segment of transmission optical fiber, at least a dispersion compensation optical amplifier in series, a optical amplifier, wherein the transmission optical fiber and the dispersion compensation optical fiber are orderly cyclically connected in series and then be connected in series with the optical amplifier, and the quantity of the dispersion compensation optical fiber in the whole optical transmission segment is at least one more than the quantity of the optical amplifier. Because the utility model uses the structure of increasing the quantity of the dispersion compensation optical fiber in the optical transmission system, the distance of the dispersion compensation is shorter than the distance of the power compensation, the dispersion compensation distance on the optical fiber transmission line is not proceeded at the same time with the power compensation, so that the influence of nonlinear effect is abated effectively, the transmission performance of the optical transmission system is improved, the utility model is favorable to achieve the optical transmission system with longer distance, larger capacity and without electronic relay.
Description
Technical field
The utility model relates to a kind of optical transmission system, the optical transmission system of particularly a kind of time division multiplexing (TDM-Time Division Multiplexing) or wavelength division multiplexing (WDM-Wave-length DivisionMultip lexing).
Background technology
Optical fiber communication has become one of main means of message transmission.Fibre system realize being decayed in the transmission, the restriction of chromatic dispersion, three kinds of factors of nonlinear effect.After deliberation multiple technologies and means the chromatic dispersion in the Optical Fiber Transmission process effectively compensates to light signal, wherein adopt the dispersion compensating fiber opposite to carry out dispersion compensation application very widely in practice with delivery fiber dispersion.The maturation of erbium-doped fiber amplifier technology also makes the optical power attenuation in the transmission course in time to be compensated.Traditional optical relay mode is that the power back-off and the dispersion compensation of light signal finished simultaneously, and as shown in Figure 1, the light signal that is sent by light signal transmitter module 1 arrives optical signal receiving module 3 through several span lines 2.For light signal can be identified at receiving terminal, after light signal transmits through one section Transmission Fibers 4 (TF:Transmission Fiber), need carry out dispersion compensation through one section dispersion compensating fiber 5 opposite (DCF:DispersionCompensation Fiber) with its chromatic dispersion, recover pulse shape, by image intensifer 6 (OA:Optical Amplifier) light signal is amplified the luminous power of regeneration to lose in the compensation transmission course simultaneously., require to increase the power of fiber middle light signal in order to overcome the spontaneous emission noise that image intensifer is introduced, to be met the Optical Signal To Noise Ratio of requirement, especially for big capacity, the transmission system of two-forty.The increase of luminous power, can cause the nonlinear effect of can not ignore, and the interaction between chromatic dispersion and the nonlinear effect can cause expendable pulse shape distortion, therefore placement location and the size of the compensation rate result that all can influence nonlinear effect of dispersion compensating fiber on transmission line, how to carry out rational dispersion management, make it both can finish dispersion compensation, suppress nonlinear effect again, realize that the without electronic relay Optical Fiber Transmission of more jumbo longer distance becomes an important topic of optical transmission system.
Summary of the invention
The purpose of this utility model is at the problems referred to above, provide a kind of new dispersion compensation to open up the benefit structure, by rational dispersion management, make the ability that the utlity model has stronger opposing nonlinear effect, to realize longer distance, more jumbo without electronic relay optical transmission system.
The technical solution of the utility model is: the utility model mainly comprises and being linked in sequence
The light signal transmitter module;
Some optical transmission sections;
Optical signal receiving module
It is characterized in that described optical transmission section comprises the Transmission Fibers more than at least one section, at least more than one dispersion compensating fiber, an image intensifer, wherein preface circulation serial connection back is connected in series with image intensifer between Transmission Fibers and dispersion compensating fiber, and the quantity of the dispersion compensating fiber in the described optical transmission section is Duoed more than one than the quantity of image intensifer at least.
Be the difficulty of avoiding causing that system cost increases and the reduction system realizes because of frequent increase dispersion compensating fiber, above-mentioned optical transmission section also includes the optical node module, this optical node module is serially connected between adjacent two Transmission Fibers, and is provided with at least more than one dispersion compensating fiber in this optical node module.
The utility model is owing to adopt the structure that increases dispersion compensating fiber quantity in optical transmission system, make the dispersion compensation spacing be shorter than the power back-off spacing, dispersion compensation and power back-off are not carried out simultaneously on the optical fiber transmission line, thereby effectively weaken the influence of nonlinear effect, improve the transmission performance of optical transmission system, help realizing transmitting in longer distance, the more jumbo without electronic relay.The utility model is owing to be integrated in the dispersion compensating fiber that increases in the existing optical node module (as road module and light signal Cross module about the light signal) simultaneously, can effectively avoid because of frequently increasing the difficulty that system cost increases and the reduction system realizes that dispersion compensating fiber quantity causes, it is simple and compact for structure, realization is easy, cost performance is high, can be widely used in TDM and the WDM optical transmission system.
Describe the basic structure of the present utility model and the course of work in detail below in conjunction with accompanying drawing:
Description of drawings
Fig. 1 is existing optical transmission system structural representation;
Fig. 2 is that structure of the present utility model is formed schematic diagram;
Fig. 3 is the structural representation of the utility model preferred forms.
Fig. 4 is the transmission performance comparison diagram of the TDM optical transmission system of 10Gbit/s with dispersion compensating fiber quantity;
Fig. 5 is the transmission performance comparison diagram of the WDM optical transmission system of 10Gbit/s with dispersion compensating fiber quantity.
Embodiment
As shown in Figure 2, the utility model mainly comprises and to be linked in sequence
Light signal transmitter module 1 is used to produce and send the light signal with a plurality of wavelength period of needs transmission
Some optical transmission sections 2;
Optical signal receiving module 3 is used to receive the light signal with a plurality of wavelength period that is sent and transmitted by optical transmission section 2 by the light signal transmitter module;
Wherein said optical transmission section 2 comprises Transmission Fibers 4 more than at least one section, at least more than one dispersion compensating fiber 5, an image intensifer 6, wherein 5 preface circulations of Transmission Fibers 4 and dispersion compensating fiber serial connection back is connected in series with image intensifer 6, and the quantity of the dispersion compensating fiber 5 in the overall optical span line 2 is Duoed more than one than the quantity of image intensifer 6 at least.Be the difficulty of avoiding causing that system cost increases and the reduction system realizes because of frequent increase dispersion compensating fiber, as shown in Figure 3, preferred forms of the present utility model is, optical transmission section 2 also includes optical node module 7, this optical node module 7 is serially connected between adjacent two Transmission Fibers 4, and is provided with at least more than one dispersion compensating fiber 5 in this optical node module 7.Wherein optical node module 7 is on the light signal/following road module (OADM---Optical Add/Drop Module), light signal Cross module (OXC---Optical Cross Connect) or other optical node module.
Groundwork process of the present utility model is: as shown in Figure 3, light signal through one section Transmission Fibers 4 after, on the arrival light signal/following road module (OADM---Optical Add/DropModule) 7, on finishing light signal/following road in, on the light signal/5 pairs of light signals of dispersion compensating fiber in the module of following road carry out a certain amount of dispersion compensation.Carry out dispersion compensation and power back-off by one section Transmission Fibers 4 and a chromatic dispersion compensated fiber 5 and image intensifer 6 again through the light signal behind the OADM, equally, light signal arrives light signal Cross module OXC through one section Transmission Fibers, 4 backs again, light signal Cross module (OXC---Optical Cross Connect) 7 is when finishing light and intersecting, and also the dispersion compensating fiber 5 by wherein carries out a certain amount of dispersion compensation.Thereby the spacing of the dispersion compensation in the shortening optical transmission system, and under the situation of the spacing that does not change image intensifer 6 power back-offs, increase the quantity of dispersion compensating fiber 5, because of the distribution of the chromatic dispersion cumulant on Kerr effect in the nonlinear effect in the fiber optic transmission system and the transmission line closely related, as increasing the distortion that can aggravate with dispersion measure to waveform from phase modulated, thereby deterioration system transmissions, the intensity of four-wave mixing effect is vibrated with dispersion measure, but general in the scope that system relates to, weaken with the increase of dispersion measure; The cross-phase modulation also can weaken with the increase of dispersion measure.So can be by the distribution of dispersion measure on the reasonable control optical transmission line, make the combined influence minimum of several effects to system.
In sum, consult Fig. 4, Fig. 5 adopts the dispersion compensation structure that the utility model proposes can make the ability of the utility model opposing nonlinear effect stronger as can be seen, Fig. 4 wherein, abscissa among Fig. 5 is the distance of transmission, ordinate is a Q value of weighing the optical transmission system transmission quality, and the Q value is big more to show that the transmission performance of optical transmission system is good more, wherein, numeral on the curve shows each power back-off loose quantity of compensation of the circumstances in which people get things ready for a trip of advancing, for example 4. dispersion compensation has been carried out in expression 4 times, and the spacing of power back-off is always 80 kilometers, simultaneously as can be seen by Fig. 4 and Fig. 5, for the TDM optical transmission system, the influence that quantity that can be by increasing dispersion compensation as much as possible or number of times weaken nonlinear effect, for the WDM optical transmission system, can improve the transmission performance of optical transmission system by the spacing that suitably reduces dispersion compensation.
Claims (4)
1, a kind of optical transmission system mainly comprises being linked in sequence
Light signal transmitter module (1);
Some optical transmission sections (2);
Optical signal receiving module (3)
It is characterized in that described optical transmission section (2) comprises Transmission Fibers (4), at least more than one dispersion compensating fiber (5), the image intensifer (6) more than at least one section, wherein preface circulation serial connection back is connected in series with image intensifer (6) between Transmission Fibers (4) and dispersion compensating fiber (5), and the quantity of the dispersion compensating fiber (5) in the overall optical span line (2) is Duoed more than one than the quantity of image intensifer (6) at least.
2, optical transmission system according to claim 1, it is characterized in that above-mentioned optical transmission section (2) also includes optical node module (7), this optical node module (7) is serially connected between adjacent two Transmission Fibers (4), and is provided with at least more than one dispersion compensating fiber (5) in this optical node module (7).
3, optical transmission system according to claim 2, it is characterized in that above-mentioned optical node module (7) on the light signal/following road module, light signal Cross module.
4, according to claim 2 or 3 described optical transmission systems, it is characterized in that above-mentioned dispersion compensating fiber (5) be integrated on the light signal/following road module or light signal Cross module in.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01279962 CN2517184Y (en) | 2001-12-29 | 2001-12-29 | Optical transmission system |
| AU2002344523A AU2002344523A1 (en) | 2001-12-29 | 2002-10-22 | Optical transmission system |
| PCT/CN2002/000743 WO2003056726A1 (en) | 2001-12-29 | 2002-10-22 | Optical transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01279962 CN2517184Y (en) | 2001-12-29 | 2001-12-29 | Optical transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2517184Y true CN2517184Y (en) | 2002-10-16 |
Family
ID=4738703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01279962 Expired - Lifetime CN2517184Y (en) | 2001-12-29 | 2001-12-29 | Optical transmission system |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN2517184Y (en) |
| AU (1) | AU2002344523A1 (en) |
| WO (1) | WO2003056726A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7616893B2 (en) | 2003-03-03 | 2009-11-10 | Fujitsu Limited | Wavelength division multiplexing optical repeating transmission method and repeating apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU664449B2 (en) * | 1992-06-22 | 1995-11-16 | Nec Corporation | Optical communication transmission system |
| CA2297332A1 (en) * | 1997-07-22 | 1999-02-04 | British Telecommunications Public Limited Company | Optical transmission systems using spectral inversion for dispersion and non-linearities compensation |
| EP0954126A1 (en) * | 1998-04-28 | 1999-11-03 | Lucent Technologies Inc. | Optical dispersion compensation |
-
2001
- 2001-12-29 CN CN 01279962 patent/CN2517184Y/en not_active Expired - Lifetime
-
2002
- 2002-10-22 AU AU2002344523A patent/AU2002344523A1/en not_active Abandoned
- 2002-10-22 WO PCT/CN2002/000743 patent/WO2003056726A1/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7616893B2 (en) | 2003-03-03 | 2009-11-10 | Fujitsu Limited | Wavelength division multiplexing optical repeating transmission method and repeating apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003056726A1 (en) | 2003-07-10 |
| AU2002344523A1 (en) | 2003-07-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20111229 Granted publication date: 20021016 |
|
| DD01 | Delivery of document by public notice |
Addressee: Huawei Technologies Co., Ltd. Document name: Notification of Expiration of Patent Right Duration |