CN1300958C - A multi-wavelength single-span long distance transmission method and system - Google Patents
A multi-wavelength single-span long distance transmission method and system Download PDFInfo
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- CN1300958C CN1300958C CNB021525528A CN02152552A CN1300958C CN 1300958 C CN1300958 C CN 1300958C CN B021525528 A CNB021525528 A CN B021525528A CN 02152552 A CN02152552 A CN 02152552A CN 1300958 C CN1300958 C CN 1300958C
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- raman
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Abstract
The present invention relates to a method and a system for the multi-wavelength single-span long distance transmission of a multiplex system. The present invention is characterized in that a remote pump amplifier and a Raman amplifier are adopted in a single-span segment of a multi-wavelength transmission link, and relevant pumping sources of the remote pump amplifier and the Raman amplifier are placed at the information sink end or the information source end of the single-span segment; the pumping source of the Raman amplifier adopts pumping wavelength which corresponds to signal wavelength and has small gain for the remote pump amplifier, pumping wavelength which has large gain for the signal wavelength is selected according to the relationship between Raman gain and wavelength difference, and the wavelength difference is the difference between the signal wavelength and the pumping wavelength of the pumping source; the remote pump amplifier can adopt the ways of directional pumping, reverse pumping or bidirectional pumping. The present invention has the advantages of low cost, high gain and good performance.
Description
Technical field
The present invention relates to multiplex system, relate in particular to a kind of multi-wavelength single span long-distance transmission method and system.
Background technology
Particular application in seabed transmission or land is because the natural conditions restriction can't be set up active relaying and supervisory control system in transmission link; Perhaps use operation and maintenance cost behind the active relaying can't bear, at this moment just must increase multi-wavelength single span transmission span by operator.At present in the single span long haul transmission system, the main employing has the Raman amplifying technique, promptly, utilize the Raman effect of optical fiber that signal is amplified at stay of two nights end (stay of two nights refers to next stage relaying or receiving terminal) reverse coupled pump light or at information source end (the information source end can refer to previous stage relaying or the transmitting terminal) pump light that is coupled in the same way; Another kind method is to adopt distant pump amplifying technique, promptly rare-earth doped optical fibre is placed in the transmission link, and pumping source amplifies information source end or stay of two nights end, and pump light is coupled to rare-earth doped optical fibre signal is amplified after transmission.
In the prior art, the gain that the shortcoming of Raman amplifying technique mainly provides is less, generally has only 4～11dB, can not satisfy longer transmission span requirement; Distant pump amplifying technique is difficult to the control amplifier gain flatness when high-gain is provided, cause each channel performance widely different, has limited the further raising of transmission span.
Summary of the invention
The object of the present invention is to provide a kind of height and good multi-wavelength single span long-distance transmission method and system of performance of gaining.
The method applied in the present invention is: this multi-wavelength single span long-distance transmission method, it is characterized in that: adopt remote optical pumping amplifier and raman amplifier in the single span section of multi-wavelength transmission link, the pumping source of described remote optical pumping amplifier and raman amplifier is positioned over the stay of two nights end or the information source end of this single span section;
First pumping source of described raman amplifier adopts the pumping wavelength for the less wavelength correspondence of remote optical pumping amplifier gain, and according to the relation of Raman gain and wavelength difference, selection is for the bigger pumping wavelength of described raman amplifier wavelength gain, and described wavelength difference is pumping wavelength poor of wavelength and pumping source;
N pumping wavelength of the pumping source of described raman amplifier adopt for remote optical pumping amplifier with comprise having the 1st the less corresponding pumping wavelength of wavelength of comprehensive gain to the raman amplifier of n-1 pumping wavelength, relation according to Raman gain and wavelength difference, selection is for the bigger pumping wavelength of described raman amplifier wavelength gain, described wavelength difference is pumping wavelength poor of wavelength and raman amplifier pumping source, adjusts pumping source power according to the requirement to output spectrum flatness again;
Described remote optical pumping amplifier can adopt pumping in the same way. backward pumping or two directional pump mode.
The multi-wavelength single span long haul transmission system of the long-distance transmission method that this realization is above-mentioned, comprise the multi-wavelength transmission link, single span section in the transmission link has information source end and stay of two nights end, it is characterized in that: connect at least one remote optical pumping amplifier and a raman amplifier in the single span section of described multi-wavelength transmission link, the pumping source of remote optical pumping amplifier and raman amplifier is positioned over the information source end or the stay of two nights end of this single span section;
Described remote optical pumping amplifier comprises the pump laser as pumping source. wavelength division multiplexer WDM and the one section rare-earth doped optical fibre that places transmission link, and pumping source transfers to rare-earth doped optical fibre through optical fiber by wavelength division multiplexer WDM signal is amplified;
The pumping source wavelength of described remote optical pumping amplifier is 1480nm;
Described raman amplifier comprises pump laser 1 as pumping source to pump laser n, wavelength division multiplexer WDM and circulator, and pumping source is coupled in the optical fiber through wavelength division multiplexer WDM and circulator signal is amplified;
Described raman amplifier comprises pump laser 1 as pumping source to pump laser n, wavelength division multiplexer WDM and coupler, and pumping source is coupled in the optical fiber through wavelength division multiplexer WDM and coupler signal is amplified;
The pumping source wavelength range of choice of described raman amplifier is at 1400nm～1500nm.
Beneficial effect of the present invention is: adopt remote optical pumping amplifier and multi-wavelength raman amplifier simultaneously in the same section of striding, the whole system gain amplifier comprises Raman amplifier gain and remote optical pumping amplifier gain, the invention provides bigger gain, single span transmission span can further increase, on the other hand, the pumping source of raman amplifier adopts for remote optical pumping amplifier gain or the remote optical pumping amplifier pumping wavelength corresponding than small wavelength with the comprehensive gain of raman amplifier, relation according to Raman gain and wavelength difference, select the bigger pumping wavelength of signal wavelength gain hereto, the wavelength and the power of the multi wavelength pumping laser by adjusting raman amplifier, make each channel power of stay of two nights end be tending towards equal, like this, when the laser diode pump pumping wavelength of the pumping source of selecting raman amplifier, the gain of raman amplifier can be pointedly forms complementation to the gain of remote optical pumping amplifier, make system obtain the gain spectral of relatively flat on the whole, promote the Channel Transmission performance, optimize multi-wavelength single span transmission performance, do not need to adopt pre-emphasis technique to come optimization system by the transmitted power that reduces big gain channel, each channel power is carried out equilibrium, therefore, cost of the present invention is low. and gain height and performance are good.
Description of drawings
Fig. 1 is a system configuration schematic diagram of the present invention;
Fig. 2 is an information source end schematic diagram;
Fig. 3 is a stay of two nights end schematic diagram;
Fig. 4 is a remote optical pumping amplifier gain spectral schematic diagram;
Fig. 5 is the schematic diagram that concerns of Raman gain and wavelength difference.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
According to Fig. 1. Fig. 2 and Fig. 3, the present invention includes the multi-wavelength transmission link, single span section in the transmission link has information source end 1 and stay of two nights end 2, connect at least one remote optical pumping amplifier and a raman amplifier in the described single span section, the pumping source of remote optical pumping amplifier and raman amplifier is positioned over the information source end 1 or the stay of two nights end 2 of this single span section.
Remote optical pumping amplifier comprises the 1480nm pump laser as pumping source. the one section rare-earth doped optical fibre that places transmission link of wavelength division multiplexer WDM, present embodiment uses Er-doped fiber EDF, and pumping source transfers to Er-doped fiber EDF through optical fiber by wavelength division multiplexer WDM signal is amplified.
Raman amplifier comprises pump laser 1 as pumping source to pump laser n. wavelength division multiplexer WDM and circulator, and the also available coupler of circulator replaces, and the decay of introducing when using coupler is bigger.Pumping source amplifies signal through wavelength division multiplexer WDM and circulator, and the pumping source wavelength range of choice of raman amplifier is generally at 1400nm～1500nm.
Information source end 1 can be a transmitting terminal, and also active relaying as shown in Figure 2, comprises sending module λ
T1To sending module λ
TnWave multiplexer MUX. dispersion pre-compensation module DCM and power amplifier EDFA are sending module λ
T1To sending module λ
TnSignal deliver to wave multiplexer MUX, wave multiplexer MUX links to each other with power amplifier EDFA successively with dispersion pre-compensation module DCM again; If information source end 1 is an active relaying, then only comprise dispersion compensation module DCM and power amplifier EDFA.
Stay of two nights end 2 can be a receiving terminal, also can be active relaying, as shown in Figure 3, comprises receiver module λ
R1To receiver module λ
Rn, and channel-splitting filter DMUX, in the present invention, also be connected with dispersion compensation module DCM and amplifier Amplifiers before the channel-splitting filter DMUX; Stay of two nights end 2 can be active relaying, then only comprises dispersion compensation module DCM and amplifier Amplifiers.
The typical gains of single remote optical pumping amplifier is composed as shown in Figure 4, and the curve on top is the channel response gain curve, and the curve of bottom is corresponding noise gain curve, and when channel number increased, gain flatness worsened.
In the present invention, the pumping source of raman amplifier adopts the pumping wavelength for the less wavelength correspondence of remote optical pumping amplifier gain, relation according to Raman gain and wavelength difference, selection is for the bigger pumping wavelength of described wavelength gain, described wavelength difference is pumping wavelength poor of wavelength and pumping source, for example, for the pump laser that remote optical pumping amplifier adopted among the present invention, according to as shown in Figure 4 gain curve as can be known, when wavelength X s, less for the remote optical pumping amplifier gain, this moment, wavelength X s was about 1540nm; When selecting the 1st pumping source pump laser 1 of raman amplifier, according to the relation of as shown in Figure 5 Raman gain and wavelength difference as can be known, gain maximum when the difference of the pumping wavelength of wavelength and this pump laser 1 is 100nm, when then pump laser 1 is chosen 1440nm, the gain maximum that the signal wavelength lambda s of 1 couple of 1540nm of pump laser produces, this system of selection helps the gain of raman amplifier and the gain of remote optical pumping amplifier forms complementation, makes system obtain the channel gain of relatively flat on the whole.
Raman amplifier can only adopt a pump laser as pumping source, also can adopt a plurality of pump lasers as pumping source, as shown in Figure 1, the present invention adopts n pump laser as pumping source, equally, n pumping wavelength of the pumping source of raman amplifier adopt for remote optical pumping amplifier with comprise having the 1st the less corresponding pumping wavelength of signal wavelength of comprehensive gain to the raman amplifier of n-1 pumping wavelength, relation according to Raman gain and wavelength difference, selection is for the bigger pumping wavelength of described signal wavelength gain, described wavelength difference is pumping wavelength poor of wavelength and raman amplifier pumping source, for example, when selecting the 2nd pumping source pump laser 2 of raman amplifier, can be according to the 1480nm pump laser that aforementioned remote optical pumping amplifier adopted, and the 1st pump laser 1 of the 1440nm of the raman amplifier of choosing according to calculating, obtain the less signal wavelength lambda c of corresponding comprehensive gain, again according to the relation of Raman gain and wavelength difference, selection is for the bigger pumping wavelength of signal wavelength lambda c gain, thereby obtains the wavelength value of pump laser 2; In like manner, rule is up to choosing n pump laser wavelength like this, and by adjusting the power of each pump laser, whole system can obtain the gain spectral of a relatively flat again.
As shown in Figure 1, remote optical pumping amplifier adopts the backward pumping mode, and for the present invention, no matter remote optical pumping amplifier adopts pumping in the same way or two directional pump mode, its operation principle. and structure and method of work and noted earlier basic identical repeat no more herein.
Claims (1)
1. the gain compensating method of a multi-wavelength single span section is characterized in that: adopt raman amplifier that remote optical pumping amplifier is gained in the single span section of multi-wavelength transmission link and the gain flatness compensation, its step is as follows:
A raman amplifier the 1st pumping source adopts the pumping wavelength for the minimum wavelength correspondence of remote optical pumping amplifier gain;
B raman amplifier the 2nd pumping source adopts for comprehensively the gain corresponding pumping wavelength of wavelength of minimum of remote optical pumping amplifier and the raman amplifier that adopts the 1st pumping source;
The rest may be inferred for C, raman amplifier N pumping source adopt for remote optical pumping amplifier with comprise having comprehensively the gain corresponding pumping wavelength of wavelength of minimum of the 1st raman amplifier to the N-1 pumping source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021525528A CN1300958C (en) | 2002-11-17 | 2002-11-17 | A multi-wavelength single-span long distance transmission method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021525528A CN1300958C (en) | 2002-11-17 | 2002-11-17 | A multi-wavelength single-span long distance transmission method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1501598A CN1501598A (en) | 2004-06-02 |
| CN1300958C true CN1300958C (en) | 2007-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021525528A Expired - Lifetime CN1300958C (en) | 2002-11-17 | 2002-11-17 | A multi-wavelength single-span long distance transmission method and system |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102404053B (en) * | 2011-09-20 | 2014-07-30 | 中国电力工程顾问集团公司 | Optical fiber communication system capable of simultaneously realizing remote pump amplification and Raman amplification |
| CN105262540B (en) * | 2015-07-24 | 2019-03-15 | 国家电网公司 | Multi-wavelength single span section transmission method and system |
| CN105258781B (en) * | 2015-09-24 | 2018-11-16 | 中国石油天然气股份有限公司 | Optical fiber vibration detection system and optical fiber vibration detection method |
| CN107294604B (en) * | 2017-05-26 | 2019-06-25 | 烽火通信科技股份有限公司 | A kind of single span long-distance WDM circuit optical fiber Transmission system |
| CN111711055B (en) * | 2020-06-11 | 2021-09-10 | 武汉光迅科技股份有限公司 | Bidirectional Raman erbium-doped fiber hybrid amplifier, optical signal amplification method and system |
| CN112490830A (en) * | 2020-11-16 | 2021-03-12 | 武汉光迅电子技术有限公司 | Remote pumping system for increasing distance between pumping unit and gain unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193752A (en) * | 1997-03-13 | 1998-09-23 | 富士通株式会社 | Remotely pumping type multi-wavelength light transmission system |
| FR2787954A1 (en) * | 1998-12-28 | 2000-06-30 | Cit Alcatel | Non soliton fibre optic transmission repeaters system having Raman effect distributed pre amplifier feeding main amplifier. |
| CN1369734A (en) * | 2001-02-02 | 2002-09-18 | 日本电信电话株式会社 | Optical fiber amplifier and optical communication system using same |
| US6535331B2 (en) * | 2000-01-19 | 2003-03-18 | Advantest, Corp. | Wideband optical amplifier and wideband variable wavelength optical source |
-
2002
- 2002-11-17 CN CNB021525528A patent/CN1300958C/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193752A (en) * | 1997-03-13 | 1998-09-23 | 富士通株式会社 | Remotely pumping type multi-wavelength light transmission system |
| FR2787954A1 (en) * | 1998-12-28 | 2000-06-30 | Cit Alcatel | Non soliton fibre optic transmission repeaters system having Raman effect distributed pre amplifier feeding main amplifier. |
| US6535331B2 (en) * | 2000-01-19 | 2003-03-18 | Advantest, Corp. | Wideband optical amplifier and wideband variable wavelength optical source |
| CN1369734A (en) * | 2001-02-02 | 2002-09-18 | 日本电信电话株式会社 | Optical fiber amplifier and optical communication system using same |
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| CN1501598A (en) | 2004-06-02 |
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