CN1300958C - A multi-wavelength single-span long distance transmission method and system - Google Patents
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Abstract
一种涉及多路复用系统的多波长单跨长距离传输方法和系统,其特征在于:在多波长传输链路的单跨段中采用遥泵放大器和拉曼放大器,有关遥泵放大器和拉曼放大器的泵浦源放置于该单跨段的信宿端或信源端;所述的拉曼放大器的泵浦源采用对于遥泵放大器增益较小的信号波长对应的泵浦波长,根据拉曼增益与波长差的关系,选择对于所述的信号波长增益较大的泵浦波长,所述的波长差为信号波长与泵浦源的泵浦波长之差;所述的遥泵放大器可采用同向泵浦.反向泵浦或双向泵浦方式,本发明成本低,增益高而且性能好。
A multi-wavelength single-span long-distance transmission method and system involving a multiplexing system, characterized in that: a remote pump amplifier and a Raman amplifier are used in a single-span section of a multi-wavelength transmission link, and the remote pump amplifier and the Raman amplifier are used. The pumping source of the Mann amplifier is placed on the sink end or the source end of the single-span section; the pumping source of the Raman amplifier adopts the pumping wavelength corresponding to the smaller signal wavelength for the remote pumping amplifier gain, according to the Raman The relationship between gain and wavelength difference, select the pump wavelength with larger gain for the signal wavelength, the wavelength difference is the difference between the signal wavelength and the pump wavelength of the pump source; the remote pump amplifier can use the same Direct pumping, reverse pumping or bidirectional pumping, the invention has low cost, high gain and good performance.
Description
技术领域technical field
本发明涉及多路复用系统,尤其涉及一种多波长单跨长距离传输方法和系统。The invention relates to a multiplexing system, in particular to a multi-wavelength single-span long-distance transmission method and system.
背景技术Background technique
在海底传输或陆地上的特殊应用场合,由于自然条件限制,无法在传输链路中建立有源中继及监控系统;或者使用有源中继后的运营和维护费用让运营商无法承受,这时就必须要增大多波长单跨传输跨距。目前在单跨长距离传输系统中,主要采用有拉曼放大技术,即在信宿端(信宿指下一级中继或接收端)反向耦合泵浦光或在信源端(信源端可指前一级中继或发送端)同向耦合泵浦光,利用光纤的拉曼效应对信号进行放大;另一种方法是采用遥泵放大技术,即把稀土掺杂光纤放置在传输链路中,泵浦源放大信源端或信宿端,泵浦光经传输后耦合到稀土掺杂光纤对信号进行放大。In submarine transmission or special applications on land, due to natural conditions, it is impossible to establish an active relay and monitoring system in the transmission link; or the operation and maintenance costs after using active relay are unaffordable for operators It is necessary to increase the multi-wavelength single-span transmission span. At present, in the single-span long-distance transmission system, the Raman amplification technology is mainly used, that is, the pump light is reversely coupled at the sink end (the sink refers to the next-level relay or receiving end) or at the source end (the source end can be Refers to the previous relay or sending end) Coupling the pump light in the same direction, using the Raman effect of the fiber to amplify the signal; another method is to use the remote pump amplification technology, that is, place the rare earth doped fiber in the transmission link In the above, the pump source amplifies the source end or the sink end, and the pump light is transmitted and then coupled to the rare earth-doped optical fiber to amplify the signal.
现有技术中,拉曼放大技术的缺点主要是提供的增益较小,一般只有4~11dB,不能满足更长的传输跨距要求;遥泵放大技术在提供高增益时,很难控制放大器增益平坦度,造成各信道性能差异很大,限制了传输跨距的进一步提高。In the existing technology, the disadvantage of Raman amplification technology is mainly that the gain provided is small, generally only 4-11dB, which cannot meet the requirements of longer transmission span; when the remote pump amplification technology provides high gain, it is difficult to control the amplifier gain The flatness causes great differences in the performance of each channel, which limits the further improvement of the transmission span.
发明内容Contents of the invention
本发明的目的在于提供一种增益高且性能好的多波长单跨长距离传输方法和系统。The purpose of the present invention is to provide a multi-wavelength single-span long-distance transmission method and system with high gain and good performance.
本发明所采用的方法为:这种多波长单跨长距离传输方法,其特征在于:在多波长传输链路的单跨段中采用遥泵放大器和拉曼放大器,所述遥泵放大器和拉曼放大器的泵浦源放置于该单跨段的信宿端或信源端;The method adopted in the present invention is: this multi-wavelength single-span long-distance transmission method, which is characterized in that: a remote pump amplifier and a Raman amplifier are used in the single-span section of the multi-wavelength transmission link, and the remote pump amplifier and the Raman amplifier are used. The pump source of the Mann amplifier is placed at the sink or source end of the single-span segment;
所述的拉曼放大器的第一泵浦源采用对于遥泵放大器增益较小的波长对应的泵浦波长,并根据拉曼增益与波长差的关系,选择对于所述拉曼放大器波长增益较大的泵浦波长,所述的波长差为波长与泵浦源的泵浦波长之差;The first pumping source of the described Raman amplifier adopts the pumping wavelength corresponding to the wavelength with the smaller gain of the remote-pumped amplifier, and according to the relationship between the Raman gain and the wavelength difference, the wavelength gain for the Raman amplifier is selected to be larger pumping wavelength, the wavelength difference is the difference between the wavelength and the pumping wavelength of the pumping source;
所述的拉曼放大器的泵浦源的第n个泵浦波长采用对于遥泵放大器与包括具有第1至第n-1泵浦波长的拉曼放大器的综合增益较小的波长对应的泵浦波长,根据拉曼增益与波长差的关系,选择对于所述拉曼放大器波长增益较大的泵浦波长,所述的波长差为波长与拉曼放大器泵浦源的泵浦波长之差,再根据对输出端光谱平坦度的要求调整泵浦源功率;The nth pumping wavelength of the pumping source of the Raman amplifier adopts the pumping wavelength corresponding to the wavelength corresponding to the integrated gain of the Raman amplifier having the 1st to n-1th pumping wavelengths for the remote pumping amplifier Wavelength, according to the relationship between the Raman gain and the wavelength difference, select the pump wavelength that is larger for the wavelength gain of the Raman amplifier, and the wavelength difference is the difference between the wavelength and the pump wavelength of the Raman amplifier pump source, and then Adjust the power of the pump source according to the requirements for spectral flatness at the output end;
所述的遥泵放大器可采用同向泵浦.反向泵浦或双向泵浦方式。The remote pumping amplifier can be pumped in the same direction, reversed or bidirectionally pumped.
这种实现上述的长距离传输方法的多波长单跨长距离传输系统,包括多波长传输链路,传输链路中的单跨段具有信源端和信宿端,其特征在于:所述的多波长传输链路的单跨段中连接至少一个遥泵放大器和一个拉曼放大器,遥泵放大器和拉曼放大器的泵浦源放置于该单跨段的信源端或信宿端;This multi-wavelength single-span long-distance transmission system that realizes the above-mentioned long-distance transmission method includes a multi-wavelength transmission link, and the single-span section in the transmission link has a source end and a destination end, and is characterized in that: the multi-wavelength At least one remote-pump amplifier and one Raman amplifier are connected to the single-span section of the wavelength transmission link, and the pump sources of the remote-pump amplifier and the Raman amplifier are placed at the source or sink end of the single-span section;
所述的遥泵放大器包括作为泵浦源的泵浦激光器.波分复用器WDM和置于传输链路中的一段稀土掺杂光纤,泵浦源经光纤通过波分复用器WDM传输至稀土掺杂光纤对信号进行放大;The remote pump amplifier includes a pump laser as a pump source, a wavelength division multiplexer WDM and a section of rare earth-doped optical fiber placed in the transmission link, and the pump source is transmitted to the Rare earth-doped optical fiber amplifies the signal;
所述的遥泵放大器的泵浦源波长为1480nm;The pump source wavelength of the remote pump amplifier is 1480nm;
所述的拉曼放大器包括作为泵浦源的泵浦激光器1至泵浦激光器n、波分复用器WDM和环行器,泵浦源经波分复用器WDM和环行器耦合到光纤中对信号进行放大;The Raman amplifier includes pumping laser 1 to pumping laser n, wavelength division multiplexer WDM and circulator as the pumping source, and the pumping source is coupled to the optical fiber through the wavelength division multiplexing device WDM and circulator. The signal is amplified;
所述的拉曼放大器包括作为泵浦源的泵浦激光器1至泵浦激光器n、波分复用器WDM和耦合器,泵浦源经波分复用器WDM和耦合器耦合到光纤中对信号进行放大;Described Raman amplifier comprises pumping laser 1 to pumping laser n, wavelength division multiplexer WDM and coupler as pumping source, and pumping source is coupled in the optical fiber through wavelength division multiplexer WDM and coupler The signal is amplified;
所述的拉曼放大器的泵浦源波长选择范围在1400nm~1500nm。The pump source wavelength selection range of the Raman amplifier is 1400nm-1500nm.
本发明的有益效果为:在同一跨段同时采用遥泵放大器和多波长拉曼放大器,整个系统放大增益包括拉曼放大器增益和遥泵放大器增益,本发明提供了更大的增益,单跨传输跨距可进一步增大,另一方面,拉曼放大器的泵浦源采用对于遥泵放大器增益或遥泵放大器与拉曼放大器的综合增益较小波长对应的泵浦波长,根据拉曼增益与波长差的关系,选择对于这个信号波长增益较大的泵浦波长,通过调整拉曼放大器的多波长泵浦激光器的波长和功率,使信宿端各信道功率趋于相等,这样,在选择拉曼放大器的泵浦源的激光器泵浦波长时,拉曼放大器的增益可针对性地对遥泵放大器的增益形成互补,使系统在整体上获得相对平坦的增益谱,提升信道传输性能,优化多波长单跨传输性能,不需要采用预加重技术通过降低大增益信道的发送功率来优化系统,对各信道功率进行均衡,因此,本发明成本低.增益高而且性能好。The beneficial effects of the present invention are: the remote pump amplifier and the multi-wavelength Raman amplifier are used simultaneously in the same span, and the amplification gain of the whole system includes the Raman amplifier gain and the remote pump amplifier gain. The span can be further increased. On the other hand, the pump source of the Raman amplifier adopts the pump wavelength corresponding to the smaller wavelength of the gain of the remote pump amplifier or the combined gain of the remote pump amplifier and the Raman amplifier. According to the Raman gain and wavelength Poor relationship, choose the pump wavelength with a larger gain for this signal wavelength, and adjust the wavelength and power of the multi-wavelength pump laser of the Raman amplifier to make the power of each channel at the sink end tend to be equal. In this way, when selecting the Raman amplifier When the laser pumping wavelength of the pumping source is used, the gain of the Raman amplifier can complement the gain of the remote pumping amplifier in a targeted manner, so that the system can obtain a relatively flat gain spectrum as a whole, improve channel transmission performance, and optimize multi-wavelength single Cross-transmission performance does not need to use pre-emphasis technology to optimize the system by reducing the transmission power of large-gain channels, and equalize the power of each channel. Therefore, the present invention has low cost, high gain and good performance.
附图说明Description of drawings
图1为本发明系统结构示意图;Fig. 1 is a schematic structural diagram of the system of the present invention;
图2为信源端示意图;Figure 2 is a schematic diagram of the source end;
图3为信宿端示意图;Fig. 3 is a schematic diagram of the sink end;
图4为遥泵放大器增益谱示意图;Fig. 4 is a schematic diagram of the gain spectrum of the remote pump amplifier;
图5为拉曼增益与波长差的关系示意图。FIG. 5 is a schematic diagram of the relationship between Raman gain and wavelength difference.
具体实施方式Detailed ways
下面根据附图和实施例对本发明作进一步详细说明:Below according to accompanying drawing and embodiment the present invention will be described in further detail:
根据图1.图2和图3,本发明包括多波长传输链路,传输链路中的单跨段具有信源端1和信宿端2,所述的单跨段中连接至少一个遥泵放大器和一个拉曼放大器,遥泵放大器和拉曼放大器的泵浦源放置于该单跨段的信源端1或信宿端2。According to Fig. 1. Fig. 2 and Fig. 3, the present invention comprises multi-wavelength transmission link, the single-span section in the transmission link has information source end 1 and
遥泵放大器包括作为泵浦源的1480nm泵浦激光器.波分复用器WDM的置于传输链路中的一段稀土掺杂光纤,本实施例使用掺铒光纤EDF,泵浦源经光纤通过波分复用器WDM传输至掺铒光纤EDF对信号进行放大。The remote pump amplifier includes a 1480nm pump laser as a pump source. A section of rare earth-doped optical fiber placed in the transmission link of the wavelength division multiplexer WDM, the present embodiment uses an erbium-doped optical fiber EDF, and the pump source passes through the optical fiber. The division multiplexer WDM transmits to the erbium-doped fiber EDF to amplify the signal.
拉曼放大器包括作为泵浦源的泵浦激光器1至泵浦激光器n.波分复用器WDM和环行器,环行器也可用耦合器代替,使用耦合器时引入的衰减较大。泵浦源经波分复用器WDM和环行器对信号进行放大,拉曼放大器的泵浦源波长选择范围一般在1400nm~1500nm。The Raman amplifier includes pump laser 1 to pump laser n as the pumping source, a wavelength division multiplexer WDM and a circulator. The circulator can also be replaced by a coupler, and the attenuation introduced when the coupler is used is relatively large. The pump source amplifies the signal through the wavelength division multiplexer WDM and the circulator, and the pump source wavelength of the Raman amplifier generally ranges from 1400nm to 1500nm.
信源端1可以是发送端,也可是有源中继,如图2所示,包括发送模块λt1至发送模块λtn。合波器MUX.色散预补偿模块DCM和功率放大器EDFA是,发送模块λt1至发送模块λtn的信号送至合波器MUX,合波器MUX再与色散预补偿模块DCM和功率放大器EDFA依次相连;若信源端1是有源中继,则只包含色散补偿模块DCM和功率放大器EDFA。The source end 1 may be a sending end or an active relay, as shown in FIG. 2 , including a sending module λ t1 to a sending module λ tn . The multiplexer MUX. The dispersion precompensation module DCM and the power amplifier EDFA are, the signal from the transmission module λ t1 to the transmission module λ tn is sent to the multiplexer MUX, and the multiplexer MUX is connected with the dispersion precompensation module DCM and the power amplifier EDFA in sequence connected; if the source terminal 1 is an active relay, it only includes the dispersion compensation module DCM and the power amplifier EDFA.
信宿端2可以是接收端,也可以是有源中继,如图3所示,包括接收模块λr1至接收模块λrn,以及分波器DMUX,在本发明中,分波器DMUX前还连有色散补偿模块DCM和放大器Amplifiers;信宿端2可以为有源中继,则只包含色散补偿模块DCM和放大器Amplifiers。The
单个遥泵放大器的典型增益谱如图4所示,上部的曲线为信道响应增益曲线,下部的曲线为相应的噪声增益曲线,当信道数目增加时,增益平坦度恶化。The typical gain spectrum of a single remote pump amplifier is shown in Figure 4. The upper curve is the channel response gain curve, and the lower curve is the corresponding noise gain curve. When the number of channels increases, the gain flatness deteriorates.
在本发明中,拉曼放大器的泵浦源采用对于遥泵放大器增益较小的波长对应的泵浦波长,根据拉曼增益与波长差的关系,选择对于所述的波长增益较大的泵浦波长,所述的波长差为波长与泵浦源的泵浦波长之差,例如,对于本发明中遥泵放大器所采用的泵浦激光器,根据如图4所示的增益曲线可知,在波长λs时,对于遥泵放大器增益较小,此时波长λs约为1540nm;在选择拉曼放大器的第1个泵浦源泵浦激光器1时,根据如图5所示的拉曼增益与波长差的关系可知,当波长与该泵浦激光器1的泵浦波长之差为100nm时的增益最大,则泵浦激光器1选取1440nm时,泵浦激光器1对1540nm的信号波长λs产生的增益最大,这种选择方法有利于拉曼放大器的增益与遥泵放大器的增益形成互补,使系统在整体上获得相对平坦的信道增益。In the present invention, the pumping source of the Raman amplifier adopts the pumping wavelength corresponding to the wavelength with the smaller gain of the remote pump amplifier, and according to the relationship between the Raman gain and the wavelength difference, the pumping source with a larger gain for the wavelength is selected. wavelength, the wavelength difference is the difference between the wavelength and the pumping wavelength of the pumping source, for example, for the pumping laser used in the remote pumping amplifier of the present invention, according to the gain curve shown in Figure 4, at the wavelength λs When the gain of the remote pump amplifier is small, the wavelength λs is about 1540nm at this time; when the first pumping source of the Raman amplifier is selected to pump the laser 1, according to the Raman gain and wavelength difference as shown in Figure 5 It can be seen from the relationship that when the difference between the wavelength and the pumping wavelength of the pumping laser 1 is 100nm, the gain is the largest, and when the pumping laser 1 is selected to be 1440nm, the gain generated by the pumping laser 1 to the signal wavelength λs of 1540nm is the largest. The selection method is beneficial for the gain of the Raman amplifier and the gain of the remote pump amplifier to complement each other, so that the system as a whole can obtain a relatively flat channel gain.
拉曼放大器可以只采用一个泵浦激光器作为泵浦源,也可采用多个泵浦激光器作为泵浦源,如图1所示,本发明采用n个泵浦激光器作为泵浦源,同样,拉曼放大器的泵浦源的第n个泵浦波长采用对于遥泵放大器与包括具有第1至第n-1泵浦波长的拉曼放大器的综合增益较小的信号波长对应的泵浦波长,根据拉曼增益与波长差的关系,选择对于所述的信号波长增益较大的泵浦波长,所述的波长差为波长与拉曼放大器泵浦源的泵浦波长之差,例如,在选择拉曼放大器的第2个泵浦源泵浦激光器2时,可根据前述遥泵放大器所采用的1480nm泵浦激光器,以及根据计算选取的拉曼放大器的1440nm的第1个泵浦激光器1,得到相应的综合增益较小的信号波长λc,再根据拉曼增益与波长差的关系,选择对于信号波长λc增益较大的泵浦波长,从而取得泵浦激光器2的波长值;同理,照此规律直到选取第n个泵浦激光器波长,再通过调整各泵浦激光器的功率,整个系统可得到一个相对平坦的增益谱。The Raman amplifier can only use one pump laser as the pump source, or multiple pump lasers as the pump source. As shown in Figure 1, the present invention uses n pump lasers as the pump source. Similarly, the The nth pumping wavelength of the pumping source of the Mann amplifier adopts the pumping wavelength corresponding to the signal wavelength corresponding to the integrated gain of the Raman amplifier having the 1st to n-1th pumping wavelengths for the remote pumping amplifier, according to The relationship between Raman gain and wavelength difference, select the pump wavelength with larger gain for the signal wavelength, the wavelength difference is the difference between the wavelength and the pump wavelength of the Raman amplifier pump source, for example, when selecting When the second pumping source of the Raman amplifier pumps the
如图1所示,遥泵放大器采用反向泵浦方式,对于本发明而言,无论遥泵放大器采用同向泵浦或双向泵浦方式,其工作原理.结构以及工作方法与前面所述基本相同,此处不再赘述。As shown in Figure 1, the remote pumping amplifier adopts the reverse pumping mode. For the present invention, no matter whether the remote pumping amplifier adopts the same direction pumping or bidirectional pumping mode, its working principle, structure and working method are basically the same as those described above. Same, no more details here.
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| CN105262540B (en) * | 2015-07-24 | 2019-03-15 | 国家电网公司 | Multi-wavelength single-span 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 |
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|---|---|---|---|---|
| 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 | QUASI-DISTRIBUTED AMPLIFICATION IN A FIBER OPTIC TRANSMISSION SYSTEM |
| 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 the optical fiber amplifier |
| US6535331B2 (en) * | 2000-01-19 | 2003-03-18 | Advantest, Corp. | Wideband optical amplifier and wideband variable wavelength optical source |
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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 | QUASI-DISTRIBUTED AMPLIFICATION IN A FIBER OPTIC TRANSMISSION SYSTEM |
| 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 the optical fiber amplifier |
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| CN1501598A (en) | 2004-06-02 |
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