CN101989879B - Electronic dispersion compensation method, device and system in burst mode - Google Patents
Electronic dispersion compensation method, device and system in burst mode Download PDFInfo
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- CN101989879B CN101989879B CN2009100907253A CN200910090725A CN101989879B CN 101989879 B CN101989879 B CN 101989879B CN 2009100907253 A CN2009100907253 A CN 2009100907253A CN 200910090725 A CN200910090725 A CN 200910090725A CN 101989879 B CN101989879 B CN 101989879B
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Abstract
The invention discloses an electronic dispersion compensation method, an electronic dispersion compensation device and an electronic dispersion compensation system in a burst mode. The method comprises the following steps of: determining the current working mode of an optical network unit (ONU), wherein the current working mode is a normal working mode or an initialization working mode; obtainingan initial value of a filter coefficient in the current working mode, wherein the initial value of the filter coefficient in the initialization working mode is a preset random value and the initial value of the filter coefficient in the normal working mode is a final value of the filter coefficient in the initialization working mode; receiving data sent by the ONU and filtering the data sent by the ONU by adopting the initial value of the filter coefficient in the current working mode so as to obtain the data subjected to electronic dispersion compensation (EDC). The embodiment of the invention can realize electronic dispersion compensation in the burst mode.
Description
Technical field
The present invention relates to optical communication technique, particularly electrical dispersion compensation methods, devices and systems under a kind of burst mode.
Background technology
Adopt the optical communication technique of optical fiber in wire access technology, more and more to occupy critical role, in optical communication technique, need constantly to reduce the cost of optical-fiber network product.EPON (Passive OpticalNetwork, PON) in the system, a plurality of optical network units (Optical Network Unit, ONU) can share an optical line terminal (Optical Line Termination, OLT).In order to reduce the cost of ONU, can use FP (Fabry-Perot) laser to substitute distributed Feedback (Distributed Feedback, DFB) laser is as transmitter module, but, can there be very big shake (having electric dispersion phenomenon) in the data that send to OLT with the FP laser as transmitter module when arriving OLT, make CDR among the OLT can not accurately recover clock and the data when sending from the data that receive.Even when transmission range is far away, also may there be very big shake in the employing Distributed Feedback Laser when arriving OLT.Clock and data when sending for OLT can accurately be recovered need arrange a compensating module to compensate electric dispersion phenomenon in OLT.At present, in transmitting net, there is a kind of electrical dispersion compensation (ElectronicDispersion Compensation, EDC) method, but, because what transmit the net employing is continuous communiction mode (being continuous mode), be burst communication mode (being burst mode) and the PON system adopts, can not directly directly apply in the PON system transmitting the EDC method that adopts in the net.
To be the inventor find prior art in realizing process of the present invention there are the following problems at least: lack at the EDC method under the burst mode in the prior art.
Summary of the invention
The present invention provides electrical dispersion compensation methods, devices and systems under a kind of burst mode, solves in the prior art to lack at the EDC method under the burst mode.
The embodiment of the invention provides electrical dispersion compensation method under a kind of burst mode, comprising:
Determine the work at present pattern of optical network unit, described work at present pattern is normal mode of operation or initial work pattern;
Obtain the initial value of the filter factor under the described work at present pattern, the initial value of the filter factor under the initial work pattern is predefined random value, and the initial value of the filter factor under the normal mode of operation is the final value of the filter factor under the initial work pattern;
Receive the data that described optical network unit sends, adopt the initial value of the filter factor under the described work at present pattern, the data that described optical network unit sends are carried out filtering, obtain the data behind the electrical dispersion compensation.
The embodiment of the invention provides electrical dispersion compensation device under a kind of burst mode, comprising:
Control module, for the work at present pattern of determining optical network unit, described work at present pattern is normal mode of operation or initial work pattern;
Coefficient module, be used for obtaining the initial value of the filter factor under the described work at present pattern, the initial value of the filter factor under the initial work pattern is predefined random value, and the initial value of the filter factor under the normal mode of operation is the final value of the filter factor under the initial work pattern;
Filtration module be used for to receive the data that described optical network unit sends, and adopts the initial value of the filter factor under the described work at present pattern, and the data that described optical network unit sends are carried out filtering, obtains the data behind the electrical dispersion compensation.
The embodiment of the invention provides electrical dispersion compensation system under a kind of burst mode, comprising:
First device is for the ID that obtains optical network unit according to optical network unit and the relation that takies time slot;
Second device, be used for receiving the ID of described optical network unit, determine the work at present pattern of described optical network unit according to the ID of described optical network unit, obtain the initial value of the filter factor under the described work at present pattern, adopt the initial value of the filter factor under the described work at present pattern that the data that described optical network unit sends are carried out filtering, obtain the data behind the electrical dispersion compensation, described work at present pattern is normal mode of operation or initial work pattern, the initial value of the filter factor under the initial work pattern is predefined random value, and the initial value of the filter factor under the normal mode of operation is the final value of the filter factor under the initial work pattern.
As shown from the above technical solution, the initial value of the filter factor under the normal mode of operation of the embodiment of the invention is the final value of the filter factor under the initial work pattern, because the final value of the filter factor under the initial work pattern is the coefficient value that obtains after filtering a period of time, adopt this coefficient value can make the data behind the EDC reach stable substantially, therefore, when ONU is operated in normal mode of operation following time, can begin to carry out filtering from making data behind the EDC reach stable coefficient value substantially, realize carrying out under the normal mode of operation the quick convergence of the data of EDC, namely realize the EDC under the burst mode.
Description of drawings
The schematic flow sheet of first method that Fig. 1 provides for the embodiment of the invention;
First structural representation that installs that Fig. 2 provides for the embodiment of the invention;
Fig. 3 be the embodiment of the invention based on the structural representation of PON communication system;
Fig. 4 be the embodiment of the invention based on the uplink physical layer principle schematic of PON communication system;
Second structural representation that installs that Fig. 5 provides for the embodiment of the invention;
The schematic flow sheet of second method that Fig. 6 provides for the embodiment of the invention;
The structural representation of the system that Fig. 7 provides for the embodiment of the invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The schematic flow sheet of first method that Fig. 1 provides for the embodiment of the invention comprises:
Step 11:EDC compensation arrangement is determined the work at present pattern of ONU, and described work at present pattern is normal mode of operation or initial work pattern.
ONU is divided into two kinds of mode of operations in the embodiment of the invention, comprise initial work pattern and normal mode of operation, the initial work pattern refers to that ONU is operated under registration and the distance measuring states, this moment, ONU did not also obtain media access control layer (the Media Access Control of OLT, MAC) id of entity distribution, perhaps, but ONU has obtained the EDC compensation arrangement of id OLT end also to fail to obtain initial coefficients by the adaptive algorithm convergence.Can determine whether ONU is registered according to the corresponding relation of whether having preserved filter factor and id in the memory module in the embodiment of the invention.
Step 12: this device obtains the initial value of the filter factor under the described work at present pattern, the initial value of the filter factor under the initial work pattern is predefined random value, and the initial value of the filter factor under the normal mode of operation is the final value of the filter factor under the initial work pattern.
Step 13: this device receives the data that described ONU sends, and adopts the initial value of the filter factor under the described work at present pattern, and the data that described ONU sends are carried out filtering, obtains the data behind the EDC.
Present embodiment can also comprise: the data that the described ONU that handles through described filtering sends are carried out self-adaptive processing, obtain the updating value of the filter factor under the described work at present pattern; Receive the data that described ONU sends again, adopt the updating value of the filter factor under the described work at present pattern, the described data that receive are again carried out filtering, the data behind the EDC after obtaining upgrading.
Can also comprise: when described work at present pattern is the initial work pattern, obtain the final value of the filter factor under the initial work pattern that obtains after the self-adaptive processing, and the corresponding relation between the ID of the filter factor that obtains of storage and ONU; When described work at present pattern is normal mode of operation, obtain the filter factor under the normal mode of operation that obtains after the self-adaptive processing, and the corresponding relation between the ID of the filter factor of updated stored and ONU.
Particularly, under the initial work pattern, this device can begin adaptive-filtering from a predefined initial value and obtain filter factor, and than prior art, the embodiment of the invention need be preserved each filter factor that obtains.The mode of preserving can be that last filter factor that obtains under the initial work pattern is stored, perhaps, first filter factor that obtains under the initial work pattern begins storage, afterwards, and the filter factor of the filter factor updated stored after the renewal that obtains with self-adaptive processing.The stored filter coefficients that finally obtains is the final value of the filter factor under the initial work pattern.
Afterwards, under normal mode of operation, can begin to carry out filtering from stored filter coefficients and handle.And prior art is still to begin to carry out filtering from predefined initial value to handle, and namely prior art also needs to carry out the flow process under the initial work pattern in the embodiment of the invention one time again.The embodiment of the invention need not to carry out the convergence process under the initial work pattern one time by preserving filter factor again, can realize quick convergence, to be applicable to burst mode.
At this moment, determine that the mode of operation of ONU can comprise: receive the ID of the described ONU of the MAC entity transmission among the OLT, described MAC entity obtains the ID of described ONU according to ONU and the relation that takies time slot; When storing described corresponding relation, obtaining described mode of operation is normal mode of operation; When not storing described corresponding relation, obtaining described mode of operation is the initial work pattern.
The initial value of the filter factor under the normal mode of operation of present embodiment is the final value of the filter factor under the initial work pattern, because the final value of the filter factor under the initial work pattern is the coefficient value that obtains after filtering a period of time, adopt this coefficient value can make the data behind the EDC reach stable substantially, therefore, when ONU is operated in normal mode of operation following time, can begin to carry out filtering from making data behind the EDC reach stable coefficient value substantially, realize carrying out under the normal mode of operation the quick convergence of the data of EDC, namely realize the EDC under the burst mode.
Fig. 2 comprises control module 21, coefficient module 22 and filtration module 23 for first structural representation that installs that the embodiment of the invention provides.Control module 21 is used for determining the work at present pattern of ONU, and described work at present pattern is normal mode of operation or initial work pattern; Coefficient module 22 is connected with control module 21, be used for obtaining the initial value of the filter factor under the described work at present pattern, the initial value of the filter factor under the initial work pattern is predefined random value, and the initial value of the filter factor under the normal mode of operation is the final value of the filter factor under the initial work pattern; Filtration module 23 is connected with coefficient module 22, be used for to receive the data that described ONU sends, and adopts the initial value of the filter factor under the described work at present pattern, and the data that described ONU sends are carried out filtering, obtains the data behind the EDC.
The initial value of the filter factor under the normal mode of operation of present embodiment is the final value of the filter factor under the initial work pattern, because the final value of the filter factor under the initial work pattern is the coefficient value that obtains after filtering a period of time, adopt this coefficient value can make the data behind the EDC reach stable substantially, therefore, when ONU is operated in normal mode of operation following time, can begin to carry out filtering from making data behind the EDC reach stable coefficient value substantially, realize carrying out under the normal mode of operation the quick convergence of the data of EDC, namely realize the EDC under the burst mode.
Fig. 3 be the embodiment of the invention based on the structural representation of PON communication system, comprise ONU31, power divider (splitter) 32 and OLT33.Because the PON system is a time-division multiplex connecting system, when switching to another one ONU from an ONU, variation has taken place in link, need refresh its coefficient to adapt to new link if carry out the EDC compensation.
Fig. 4 be the embodiment of the invention based on the uplink physical layer principle schematic of PON communication system, comprise ONU41, optical fiber 42 and OLT43.Wherein, ONU41 comprises burst mode laser driver (BM LDD) 411 and light source 412, and light source 412 can be Distributed Feedback Laser or FP laser or other lasers, and the light that ONU41 sends sends to OLT43 through optical fiber 42.OLT43 comprises photoelectric detector 431, burst mode trans-impedance amplifier (BM TIA) 432, burst mode limiting amplifier (BM LA) 433, burst mode electrical dispersion compensation unit (BM EDC) 434 and burst mode data clock recovery circuit (BM CDR) 435.Photoelectric detector 431 can be avalanche photo diode (APD) or phase switcher diode (PIN) and other types detector, the electric current that photoelectric detector 431 produces is converted into voltage signal by burst mode trans-impedance amplifier 432 with current signal, and be converted into logic level signal by follow-up burst mode limiting amplifier 433,434 pairs of chromatic dispersions in burst mode electrical dispersion compensation unit that provide through the embodiment of the invention afterwards compensate, signal after the compensation recovers data and clock by burst mode data clock recovery circuit 435, for follow-up use.
Fig. 5 comprises control module 51, coefficient module 52, filtration module 53 for second structural representation that installs that the embodiment of the invention provides, and also comprises adaptive algorithm module 54, memory module 55, first switch module 56 and second switch module 57.
Present embodiment adopts adaptive algorithm that the filter factor under the different working modes is upgraded, and realizes the self adaptation of filtering; The filter factor that obtains under the initial work pattern is carried out corresponding preservation with the id of corresponding ONU, can be downloaded in normal mode of operation to make filtered data reach stable initial value comparatively fast, realize the quick convergence of data, satisfy the EDC demand under the burst mode.
The schematic flow sheet of second method that Fig. 6 provides for the embodiment of the invention comprises:
Step 601: beginning.
Step 602: control module judges whether ONU is registered, if, execution in step 607, otherwise, execution in step 603.
The MAC entity of step 603:OLT distributes id to give ONU.
When not obtaining id that the MAC entity of OLT distributes, carries out ONU this step.
Step 604: the adaptive algorithm module obtains filter factor by adaptive algorithm.Afterwards, filter factor is sent to memory module.
Step 605: memory module is set up or renewal id and filter factor corresponding relation.
When not preserving this corresponding relation in the memory module, need newly-built this corresponding relation, when having preserved this corresponding relation in the memory module, behind the filter factor that the calculating of adaptive algorithm module makes new advances, upgrade this corresponding relation.
Step 606: judge whether this ONU time slot corresponding finishes, if, execution in step 613, otherwise, repeated execution of steps 604.
Step 607:MAC entity passes to control module with the id of ONU.
Step 608: the filter factor that the id that the id that control module provides according to the MAC entity preserves from memory module is corresponding with taking-up in the corresponding relation of filter factor is composed to coefficient module.
Step 609: filtration module and adaptive algorithm module, the initial filter coefficients from coefficient module begins the self adaptation convergence process.
Step 610: the filter factor of preserving in the filter factor updated stored module after the adaptive algorithm module will be upgraded.
Step 611: the filter factor after memory module will be upgraded is given filtration module by the coefficient module assignment, adopts new filter factor to proceed the self adaptation convergence process.
Step 612: judge whether this ONU time slot corresponding finishes, if, execution in step 613, otherwise, repeated execution of steps 609.
Step 613: finish.
Present embodiment adopts adaptive algorithm that the filter factor under the different working modes is upgraded, and realizes the self adaptation of filtering; The filter factor that obtains under the initial work pattern is carried out corresponding preservation with the id of corresponding ONU, can be downloaded in normal mode of operation to make filtered data reach stable initial value comparatively fast, realize the quick convergence of data, satisfy the EDC demand under the burst mode
The structural representation of the system that Fig. 7 provides for the embodiment of the invention comprises first device, 71 and second device 72.First device 71 is used for obtaining according to ONU and the relation that takies time slot the ID of ONU to be communicated by letter; Second device 72 is used for receiving the ID of described ONU, determine the work at present pattern of described ONU according to the ID of described optical network unit, obtain the initial value of the filter factor under the described work at present pattern, adopt the initial value of the filter factor under the described work at present pattern that the data that described ONU sends are carried out filtering, obtain the data behind the EDC, described work at present pattern is normal mode of operation or initial work pattern, the initial value of the filter factor under the initial work pattern is predefined random value, and the initial value of the filter factor under the normal mode of operation is the final value of the filter factor under the initial work pattern.
Wherein, first device 71 can be the MAC entity among the OLT; Second device 72 can be Fig. 2 or EDC device shown in Figure 5.
Present embodiment is operated in normal mode of operation following time at ONU, by obtaining the filter factor under the initialize mode, can begin to carry out filtering from making data behind the EDC reach stable coefficient value substantially, therefore can realize carrying out under the normal mode of operation the quick convergence of the data of EDC, realize the EDC under the burst mode.
On the basis of above-described embodiment, the embodiment of the invention also provides a kind of OLT, comprises Fig. 2 or EDC device shown in Figure 5, perhaps comprises system shown in Figure 7.
The OLT of present embodiment is operated in normal mode of operation following time at ONU, by obtaining the filter factor under the initialize mode, can begin to carry out filtering from making data behind the EDC reach stable coefficient value substantially, therefore can realize carrying out under the normal mode of operation the quick convergence of the data of EDC, realize the EDC under the burst mode.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (10)
1. electrical dispersion compensation method under the burst mode is characterized in that, comprising:
Determine the work at present pattern of optical network unit, described work at present pattern is normal mode of operation or initial work pattern; Wherein, the work at present pattern of described definite optical network unit comprises: receive the ID of the described optical network unit of the media access control layer entity transmission in the optical line terminal, described media access control layer entity obtains the ID of described optical network unit according to optical network unit and the relation that takies time slot; When the corresponding relation between the ID that stores filter factor and optical network unit, obtaining described mode of operation is normal mode of operation; When the corresponding relation between the ID that does not store filter factor and optical network unit, obtaining described mode of operation is the initial work pattern;
Obtain the initial value of the filter factor under the described work at present pattern, the initial value of the filter factor under the initial work pattern is predefined random value, and the initial value of the filter factor under the normal mode of operation is the final value of the filter factor under the initial work pattern;
Receive the data that described optical network unit sends, adopt the initial value of the filter factor under the described work at present pattern, the data that described optical network unit sends are carried out filtering, obtain the data behind the electrical dispersion compensation.
2. method according to claim 1 is characterized in that, also comprises: the data that the described optical network unit of handling through described filtering sends are carried out self-adaptive processing, obtain the updating value of the filter factor under the described work at present pattern;
Receive the data that described optical network unit sends again, adopt the updating value of the filter factor under the described work at present pattern, the described data that receive are again carried out filtering, the data behind the electrical dispersion compensation after obtaining upgrading.
3. method according to claim 2 is characterized in that, also comprises:
When described work at present pattern is the initial work pattern, obtain the final value of the filter factor under the initial work pattern that obtains after the self-adaptive processing, and the corresponding relation between the ID of the filter factor that obtains of storage and optical network unit;
When described work at present pattern is normal mode of operation, obtain the filter factor under the normal mode of operation that obtains after the self-adaptive processing, and the corresponding relation between the ID of the filter factor of updated stored and optical network unit.
4. electrical dispersion compensation device under the burst mode is characterized in that, comprising:
Control module, for the work at present pattern of determining optical network unit, described work at present pattern is normal mode of operation or initial work pattern; Wherein, described control module comprises: the ID acquiring unit, be used for to receive the ID of the described optical network unit that the media access control layer entity of optical line terminal sends, described media access control layer entity obtains the ID of described optical network unit according to optical network unit and the relation that takies time slot; Determining unit, during for the corresponding relation between the ID that stores filter factor and optical network unit in memory cell, obtaining described work at present pattern is normal mode of operation, when not storing the corresponding relation between the ID of filter factor and optical network unit in described memory cell, obtaining described work at present pattern is the initial work pattern;
Coefficient module, be used for obtaining the initial value of the filter factor under the described work at present pattern, the initial value of the filter factor under the initial work pattern is predefined random value, and the initial value of the filter factor under the normal mode of operation is the final value of the filter factor under the initial work pattern;
Filtration module be used for to receive the data that described optical network unit sends, and adopts the initial value of the filter factor under the described work at present pattern, and the data that described optical network unit sends are carried out filtering, obtains the data behind the electrical dispersion compensation.
5. device according to claim 4 is characterized in that, also comprises:
The adaptive algorithm module is used for the data after handling through described filtration module are carried out self-adaptive processing, obtains the updating value of the filter factor under the described work at present pattern;
Described coefficient module also is used for obtaining the updating value of the filter factor under the described work at present pattern;
Described filtration module also is used for receiving the data that described optical network unit sends again, adopts the updating value of the filter factor under the described work at present pattern, and the data that receive are again carried out filtering, the data behind the electrical dispersion compensation after obtaining upgrading.
6. device according to claim 5 is characterized in that, also comprises:
Memory module, be connected with described adaptive algorithm module, be used for when described work at present pattern is the initial work pattern, obtain the final value of the filter factor under the initial work pattern that obtains after the self-adaptive processing, and the corresponding relation between the ID of the final value of the filter factor under the initial work pattern that obtains of storage and optical network unit; When described work at present pattern is normal mode of operation, obtain the filter factor under the normal mode of operation that obtains after the self-adaptive processing, and with the corresponding relation between the ID of the filter factor of the filter factor updated stored under the normal mode of operation that obtains and optical network unit.
7. device according to claim 6 is characterized in that, also comprises:
First switch module is used for being communicated with described adaptive algorithm module and described coefficient module when described control module determines that described work at present pattern is the initial work pattern;
The second switch module is used for being communicated with described memory module and described coefficient module when described control module determines that described work at present pattern is normal mode of operation.
8. device according to claim 7 is characterized in that,
Described first switch module also is used for disconnecting described adaptive algorithm module and described coefficient module when described control module determines that described work at present pattern is normal mode of operation; Perhaps,
Described second switch module also is used for disconnecting described memory module and described coefficient module when described control module determines that described work at present pattern is the initial work pattern.
9. electrical dispersion compensation system under the burst mode is characterized in that, comprising:
First device is for the ID that obtains optical network unit according to optical network unit and the relation that takies time slot;
Second device, be used for receiving the ID of described optical network unit, determine the work at present pattern of described optical network unit according to the ID of described optical network unit, obtain the initial value of the filter factor under the described work at present pattern, adopt the initial value of the filter factor under the described work at present pattern that the data that described optical network unit sends are carried out filtering, obtain the data behind the electrical dispersion compensation, described work at present pattern is normal mode of operation or initial work pattern, the initial value of the filter factor under the initial work pattern is predefined random value, and the initial value of the filter factor under the normal mode of operation is the final value of the filter factor under the initial work pattern; Wherein, described ID according to optical network unit determines the work at present pattern of described optical network unit, comprise: receive the ID of the described optical network unit of the media access control layer entity transmission in the optical line terminal, described media access control layer entity obtains the ID of described optical network unit according to optical network unit and the relation that takies time slot; When the corresponding relation between the ID that stores filter factor and optical network unit, obtaining described mode of operation is normal mode of operation; When the corresponding relation between the ID that does not store filter factor and optical network unit, obtaining described mode of operation is the initial work pattern.
10. system according to claim 9 is characterized in that, described system is optical line terminal.
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| CN102412897B (en) * | 2011-08-17 | 2014-12-10 | 索尔思光电（成都）有限公司 | Single-fiber four-way symmetrical optical module |
| CN103281129A (en) * | 2013-05-20 | 2013-09-04 | 青岛海信宽带多媒体技术有限公司 | Optical module and electric domain dispersion compensation method thereof |
| CN108574532B (en) * | 2017-03-13 | 2022-11-08 | 中兴通讯股份有限公司 | Optical signal power control method and device and optical line terminal |
| CN113242094B (en) * | 2021-04-30 | 2022-11-15 | 武汉联特科技股份有限公司 | Optical module-based electric dispersion compensation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1323475A (en) * | 1998-09-21 | 2001-11-21 | 康宁股份有限公司 | Pre-and post-compensation techniques for wavelength division multiplexing system |
| CN1939020A (en) * | 2004-03-31 | 2007-03-28 | 英国电讯有限公司 | Communication system |
| EP1971051A1 (en) * | 2005-12-20 | 2008-09-17 | ZTE Corporation | An apparatus and method for selfadapting dispersion compensation |
| CN101447834A (en) * | 2008-09-16 | 2009-06-03 | 北京邮电大学 | Electrical domain dispersion compensation method based on dispersion curve in WDM network |
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| US7522841B2 (en) * | 2005-10-21 | 2009-04-21 | Nortel Networks Limited | Efficient data transmission and training of data processing functions |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323475A (en) * | 1998-09-21 | 2001-11-21 | 康宁股份有限公司 | Pre-and post-compensation techniques for wavelength division multiplexing system |
| CN1939020A (en) * | 2004-03-31 | 2007-03-28 | 英国电讯有限公司 | Communication system |
| EP1971051A1 (en) * | 2005-12-20 | 2008-09-17 | ZTE Corporation | An apparatus and method for selfadapting dispersion compensation |
| CN101447834A (en) * | 2008-09-16 | 2009-06-03 | 北京邮电大学 | Electrical domain dispersion compensation method based on dispersion curve in WDM network |
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