CN113810114B - Remote pump Raman amplification method in long-distance optical fiber transmission system - Google Patents
Remote pump Raman amplification method in long-distance optical fiber transmission system Download PDFInfo
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- CN113810114B CN113810114B CN202111365491.6A CN202111365491A CN113810114B CN 113810114 B CN113810114 B CN 113810114B CN 202111365491 A CN202111365491 A CN 202111365491A CN 113810114 B CN113810114 B CN 113810114B
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 32
- 230000003321 amplification Effects 0.000 title claims abstract description 30
- 230000005540 biological transmission Effects 0.000 title claims abstract description 30
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 30
- 239000013307 optical fiber Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008878 coupling Effects 0.000 claims abstract description 3
- 238000010168 coupling process Methods 0.000 claims abstract description 3
- 238000005859 coupling reaction Methods 0.000 claims abstract description 3
- 239000000835 fiber Substances 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 15
- 238000002310 reflectometry Methods 0.000 claims description 10
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000009022 nonlinear effect Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
- H04B10/2916—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin amplifiers
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Abstract
The invention discloses a remote pump Raman amplification method in a long-distance optical fiber transmission system, which comprises a first step of generating high-order pump light, a second step of outputting multi-order mixed pump light by using a pump light generation module, a third step of outputting first-order pump light by using a pump light amplification module, and a fourth step of coupling the first-order pump light into a gain optical fiber at a system gain point to amplify signal light; according to the invention, the generation of a nonlinear effect is inhibited through a distributed amplification structure, and incoherent broadband first-order pump light generated by a high-order pump source is adopted to amplify signal light, so that higher gain flatness and better noise performance in a C + L waveband range are realized on the basis of low maintenance cost, and the self-adaptive adjustment of gain size and flatness is realized through the feedback control of gain performance on each module.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a remote pump Raman amplification method in a long-distance optical fiber transmission system.
Background
In the long-distance optical communication scene of electric power communication, the complex geographic environment causes that the construction and maintenance of the electric relay equipment are very difficult and the cost is overhigh, and the long-distance unrepeatered optical fiber transmission system makes up the defect, thereby becoming the preferred communication system in the scene, and under the requirement of the current big data era, the transmission bandwidth is widened to the C + L waveband, so that the transmission capacity can be further increased, the era requirement is met, in the system, the optical signal is greatly lost after long-distance transmission, and the system performance can be seriously influenced;
at present, an erbium-doped fiber amplifier widely used can amplify transmission signals in a remote pump mode, has high gain, but has poor noise performance and flatness performance, can accumulate large gain deviation during long-distance amplification, and is difficult to apply to long-distance transmission of a C + L waveband, while a Raman amplifier based on a Raman effect can realize good noise performance due to introduction of a high-order pump source, has flat gain within a certain frequency band range, but needs to adjust power of more pump lasers when realizing the flat gain, has high cost, and is difficult to determine the power value of each laser due to the phenomenon that energy is transferred from high frequency to low frequency, so that the Raman amplifier is inconvenient to design the flat gain, and therefore, the invention provides a Raman amplification method of a pump in a remote fiber transmission system to solve the problems in the prior art.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a remote pump raman amplification method in a long-distance optical fiber transmission system, in which generation of a nonlinear effect is suppressed by a distributed amplification structure, and incoherent broadband first-order pump light generated by a high-order pump source is used to amplify signal light, so that high gain flatness and good noise performance in a C + L band range are achieved on the basis of low maintenance cost, and adaptive adjustment of gain size and flatness is achieved by feedback control of gain performance on each module.
In order to realize the purpose of the invention, the invention is realized by the following technical scheme: a remote pump Raman amplification method in a long-distance optical fiber transmission system comprises the following steps:
step one, a high-order pump laser at a receiving end generates a light wave with a frequency range of Stokes frequency shift of pump source orders relative to a transmission signal as a high-order pump source;
step two, the high-order pump source outputs multi-order mixed pump light which is formed by continuous order pump light including high-order pump light and first-order pump light and has pump source order number Stokes frequency shift relative to the transmission signal in a frequency range through the pump light generation module;
inputting the multi-order mixed pump light into a pump light amplification module, and outputting two paths of amplified first-order pump light;
and step four, respectively taking two paths of first-order pump light as bidirectional pump sources through a combined structure of a remote pump and a selectable pump structure, transmitting the bidirectional pump light to a gain point of the long-distance unrepeatered optical fiber transmission system in a C + L waveband in a way of following and bypassing, and coupling the bidirectional pump light to a gain optical fiber in a selectable pump way to amplify the signal light.
The further improvement lies in that: and in the second step, the high-order pump light sequentially generates pump light with the order being gradually reduced through a pump light generation module consisting of a plurality of reflection filters, a plurality of sections of single-mode fibers, a single-mode fiber with one end coated with a reflection film and a circulator, and outputs multi-order mixed pump light, wherein the reflection filters are reflection filters with adjustable reflectivity.
The further improvement lies in that: the multi-order mixed pump light is amplified and outputs two paths of first-order pump light through a resonant cavity formed by two reflection filters with adjustable reflectivity and a gain fiber, the reflectivity of each sub-band in the reflection filters is adjusted in a self-adaptive mode through the feedback of received signals, and the pump light amplification module in the third step is formed by two reflection amplifiers and a gain fiber.
The further improvement lies in that: the feedback of the receiving signal comprises noise estimation information and gain flatness information, and the noise performance of the reflection amplifier is optimized by adjusting the proportion of forward pump light and backward pump light by adjusting the relative reflectivity of two reflection filters; the gain flatness of the reflection amplifier is optimized by adjusting the relative reflectivities of the different frequency bands in the reflection filter.
The further improvement lies in that: in the second step, the pumping light source generating module divides the input high-order pumping light into two paths, one path is used for generating low-order pumping light, the other path is used for amplifying the low-order pumping light, and the power distribution proportion is adjusted according to the received signal, wherein the power distribution proportion comprises a power distributor, each-order self-excited Raman effect modules, a first-order self-excited Raman effect module and a wave combiner.
The further improvement lies in that: the power divider distributes and inputs high-order pump light according to a given power ratio, outputs two paths of three-order pump light with a certain power ratio, and the power ratio is adjusted according to feedback of received signals;
each order of self-excited Raman effect modules respectively comprise two reflection amplifiers and a single mode fiber, high-order pump light generates self-excited Raman effect in the single mode fiber after passing through the reflection amplifiers, generated second-order pump light is amplified and output in a resonant cavity formed by the two reflection amplifiers, the output comprises the high-order pump light and the second-order pump light, and the high-order pump light outputs multi-order mixed pump light taking the second-order pump light as the main part through cascaded self-excited Raman effect modules except for the first order;
the wave combiner combines the output of the first-order self-excited Raman effect module with the high-order pump light output by the other path of the power distributor, and outputs multi-order mixed pump light consisting of continuous-order pump light including high-power high-order pump light and first-order pump light.
The further improvement lies in that: in the combined structure of the remote pump and the bidirectional pump structure in the fourth step, the reflection coefficient of the reflection filter at one side in the pump light resonance amplification module is adjusted to be the highest, so that the pump light is coupled into the fiber only from the front direction or the back direction, and the signal amplification is carried out in a selectable pump mode.
The further improvement lies in that: and when the signals in the fourth step are optically coupled, the multi-order mixed pumping light is coupled into a gain optical fiber connected with a reflection filter which has a section of Stokes frequency shift relative to the transmission signal in two reflection frequency ranges through an optical isolator, wherein the reflection coefficient of each frequency range of the reflection filter is adjusted according to the feedback of a receiving end.
The invention has the beneficial effects that: according to the invention, the generation of a nonlinear effect is inhibited through a distributed amplification structure, and incoherent broadband first-order pump light generated by a high-order pump source is adopted to amplify signal light, so that higher gain flatness and better noise performance in a C + L waveband range are realized on the basis of low maintenance cost, and the self-adaptive adjustment of gain size and flatness is realized through the feedback control of gain performance on each module.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Fig. 2 is a structural diagram of a pump light generation module according to an embodiment of the invention.
Fig. 3 is a structural diagram of a pump light amplification module according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a system for amplifying signal light according to an embodiment of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
According to fig. 1, 2, 3 and 4, the present embodiment provides a method for remote pump raman amplification in a long-distance optical fiber transmission system, including the following steps:
step one, a plurality of lasers with different frequencies at a receiving end are combined to generate optical waves with the frequency range of 1225-1325nm, the optical waves are used as a three-order pump source, and two paths of three-order pump light are output through a power divider;
step two, the third-order pump source passes through the pump light generation module composed of two reflection filters with the reflection frequency range of 1325nm-1425nm, two-end single-mode fibers and a circulator, as shown in the attached figure 3 of the specification, the output frequency range is variable, and in the embodiment, the output frequency range is mixed pump light composed of third-order, second-order and first-order pump lights with the reflection frequency ranges of 1225-1325nm, 1325-1425nm and 1425-1525 nm;
inputting the mixed pump light into a pump light amplification module consisting of two reflection filters with the reflection frequency range of 1425nm-1525nm and a section of gain fiber, and outputting two paths of amplified first-order pump light as shown in the attached figure 3 of the specification;
step four, two paths of first-order pump light are respectively used as bidirectional pump sources through a combined structure of a remote pump and a bidirectional pump structure, transmitted to a gain point of a long-distance unrepeatered optical fiber transmission system in a C + L waveband in a channel following and bypass mode, and coupled to a gain optical fiber in a selectable pump mode to amplify signal light, wherein the system is shown as an attached figure 4 in the specification;
and step five, the amplified and transmitted optical signals are received and analyzed, and the gain size, the flatness and the noise performance of the amplifier are evaluated, so that the parameters of a power divider and a reflection filter in the pump light generation module are adjusted, and the optimal gain performance matched with the current signal and the channel is realized.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A remote pump Raman amplification method in a long-distance optical fiber transmission system is characterized by comprising the following steps:
step one, generating a light wave with a frequency range of Stokes frequency shift of pump source orders relative to a transmission signal by a high-order pump laser at a receiving end, and taking the light wave as a high-order pump source;
step two, the high-order pump source outputs multi-order mixed pump light which is formed by continuous order pump light including high-order pump light and first-order pump light and has pump source order number Stokes frequency shift relative to the transmission signal in a frequency range through the pump light generation module;
inputting the multi-order mixed pump light into a pump light amplification module, and outputting two paths of amplified first-order pump light;
step four, respectively taking two paths of first-order pump light as two-way pump sources through a combined structure of a remote pump and a two-way pump structure, transmitting the two paths of first-order pump light to a gain point of a long-distance unrepeatered optical fiber transmission system in a channel following and bypass mode, and coupling the two paths of first-order pump light to a gain optical fiber in a selectable pump mode to amplify signal light;
in the combined structure of the remote pump and the bidirectional pump structure in the fourth step, the reflection coefficient of the reflection filter at one side in the pump light resonance amplification module is adjusted to be the highest, so that the pump light is coupled into the fiber only from the front direction or the back direction, and the signal amplification is carried out in a selectable pump mode.
2. A method of raman amplification by a remote pump in a long haul optical fiber transmission system according to claim 1, wherein: and in the second step, the pump light generation module consists of a plurality of reflection filters, a plurality of sections of common single-mode optical fibers, a single-mode optical fiber with one end coated with a reflection film and a circulator, wherein the reflection filters are reflection filters with adjustable reflectivity.
3. A method of raman amplification by a remote pump in a long haul optical fiber transmission system according to claim 2, wherein: the multi-order mixed pump light is amplified and outputs two paths of first-order pump light through a resonant cavity formed by two reflection filters with adjustable reflectivity and a gain fiber, the reflectivity of each sub-band in the reflection filters is adjusted in a self-adaptive mode through the feedback of received signals, and the pump light amplification module in the third step is formed by two reflection amplifiers and a gain fiber.
4. A method of raman amplification by a remote pump in a long haul optical fiber transmission system according to claim 3, wherein: the feedback of the receiving signal comprises noise estimation information and gain flatness information, and the noise performance of the reflection amplifier is optimized by adjusting the proportion of forward pump light and backward pump light by adjusting the relative reflectivity of two reflection filters; the gain flatness of the reflection amplifier is optimized by adjusting the relative reflectivities of the different frequency bands in the reflection filter.
5. A method of raman amplification by a remote pump in a long haul optical fiber transmission system according to claim 1, wherein: and the second pump light generation module divides the input high-order pump light into two paths, one path is used for generating low-order pump light, the other path is used for amplifying the low-order pump light, and the power distribution proportion is adjusted according to the received signal, wherein the second pump light generation module comprises a power distributor, each-order self-excited Raman effect module, a first-order self-excited Raman effect module and a wave combiner.
6. A method of Raman amplification of a remote pump in a long haul optical fiber transmission system according to claim 5, wherein: the power divider distributes and inputs high-order pump light according to a given power ratio, outputs two paths of three-order pump light with a certain power ratio, and the power ratio is adjusted according to feedback of received signals;
each order of self-excited Raman effect modules respectively comprise two reflection amplifiers and a single mode fiber, high-order pump light generates self-excited Raman effect in the single mode fiber after passing through the reflection amplifiers, generated second-order pump light is amplified and output in a resonant cavity formed by the two reflection amplifiers, the output comprises the high-order pump light and the second-order pump light, and the high-order pump light outputs multi-order mixed pump light taking the second-order pump light as the main part through cascaded self-excited Raman effect modules except for the first order;
the first-order self-excitation Raman effect module consists of a circulator and a single-mode fiber, after multi-order mixed pump light mainly comprising second-order pump light is input into the circulator from the first port, the self-excitation Raman effect is generated in the single-mode fiber connected with the second port to generate first-order pump light, and the third port outputs multi-order mixed pump light consisting of continuous-order pump light including high-order pump light and first-order pump light;
the wave combiner combines the output of the first-order self-excited Raman effect module with the high-order pump light output by the other path of the power distributor, and outputs multi-order mixed pump light consisting of continuous-order pump light including high-power high-order pump light and first-order pump light.
7. A method of raman amplification by a remote pump in a long haul optical fiber transmission system according to claim 1, wherein: and when the signals in the fourth step are optically coupled, the multi-order mixed pumping light is coupled into a gain optical fiber connected with two reflection filters with the reflection frequency ranges of one section of Stokes frequency shift relative to the transmission signals through an optical isolator, wherein the reflection coefficients of all the frequency ranges of the reflection filters are adjusted according to the feedback of a receiving end.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6163636A (en) * | 1999-01-19 | 2000-12-19 | Lucent Technologies Inc. | Optical communication system using multiple-order Raman amplifiers |
| CN102404053A (en) * | 2011-09-20 | 2012-04-04 | 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 |
| CN105262540A (en) * | 2015-07-24 | 2016-01-20 | 国家电网公司 | Multi-wavelength single span transmission method and system |
| CN107181529A (en) * | 2017-07-03 | 2017-09-19 | 无锡市德科立光电子技术有限公司 | A kind of multi-wavelength repeatless transmission system |
| CN112033447A (en) * | 2020-09-08 | 2020-12-04 | 东南大学 | Brillouin optical time domain analysis system based on quasi-distributed passive remote pump amplification |
| CN112953640A (en) * | 2021-01-18 | 2021-06-11 | 中国南方电网有限责任公司超高压输电公司 | Cascade remote pump amplification system, remote gain unit and signal light amplification method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165530B (en) * | 2019-06-24 | 2024-01-26 | 中国人民解放军国防科技大学 | High-power Raman fiber laser generation method and system |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6163636A (en) * | 1999-01-19 | 2000-12-19 | Lucent Technologies Inc. | Optical communication system using multiple-order Raman amplifiers |
| CN102404053A (en) * | 2011-09-20 | 2012-04-04 | 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 |
| CN105262540A (en) * | 2015-07-24 | 2016-01-20 | 国家电网公司 | Multi-wavelength single span transmission method and system |
| CN107181529A (en) * | 2017-07-03 | 2017-09-19 | 无锡市德科立光电子技术有限公司 | A kind of multi-wavelength repeatless transmission system |
| CN112033447A (en) * | 2020-09-08 | 2020-12-04 | 东南大学 | Brillouin optical time domain analysis system based on quasi-distributed passive remote pump amplification |
| CN112953640A (en) * | 2021-01-18 | 2021-06-11 | 中国南方电网有限责任公司超高压输电公司 | Cascade remote pump amplification system, remote gain unit and signal light amplification method |
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