CN216251606U - Rear pumping Raman optical fiber amplifier based on tellurate glass optical fiber - Google Patents
Rear pumping Raman optical fiber amplifier based on tellurate glass optical fiber Download PDFInfo
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- CN216251606U CN216251606U CN202123002580.2U CN202123002580U CN216251606U CN 216251606 U CN216251606 U CN 216251606U CN 202123002580 U CN202123002580 U CN 202123002580U CN 216251606 U CN216251606 U CN 216251606U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 56
- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 45
- XHGGEBRKUWZHEK-UHFFFAOYSA-L tellurate Chemical compound [O-][Te]([O-])(=O)=O XHGGEBRKUWZHEK-UHFFFAOYSA-L 0.000 title claims abstract description 36
- 238000005086 pumping Methods 0.000 title claims abstract description 25
- 239000011521 glass Substances 0.000 title claims description 15
- 230000003287 optical effect Effects 0.000 claims abstract description 54
- 239000003365 glass fiber Substances 0.000 claims abstract description 34
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 230000008030 elimination Effects 0.000 claims abstract description 13
- 238000003379 elimination reaction Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 4
- SITVSCPRJNYAGV-UHFFFAOYSA-L tellurite Chemical compound [O-][Te]([O-])=O SITVSCPRJNYAGV-UHFFFAOYSA-L 0.000 claims description 15
- 230000003321 amplification Effects 0.000 abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 11
- 238000004891 communication Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000001228 spectrum Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004038 photonic crystal Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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Abstract
The utility model relates to a backward pumping Raman fiber amplifier based on tellurate glass fiber, which comprises: the combiner is used for coupling the signal lights with different wavelengths emitted by the optical transmitters to generate coupled signal lights; the pump laser is used for emitting pump light with different wavelengths; the optical coupler is used for coupling the pump light to generate coupled pump light; the tellurate glass fiber is used for providing a gain medium for the reaction between the coupled signal light and the coupled pump light, and the coupled signal light and the coupled pump light generate amplified signal light and residual pump light after the stimulated Raman scattering effect; the band elimination filter is used for filtering residual pump light and transmitting amplified signal light; and the wave separator is used for separating the amplified signal light transmitted by the band elimination filter into single light beams with different wavelengths and transmitting the single light beams to each optical receiver for receiving. The utility model can realize high gain, low flatness and low noise, and can be flexibly applied to each position of the optical fiber communication network amplification.
Description
Technical Field
The utility model relates to the field of Raman fiber amplifiers, in particular to a backward pumping Raman fiber amplifier based on tellurite glass fibers.
Background
With the commercialization of 5G networks and the gradual development of 6G system research, the challenges faced by modern optical communication networks are gradually changed into increasing the transmission rate of optical signals, increasing the energy of dense wavelength division multiplexing and increasing the rapid amplification capability of signals. In the transmission process of optical signals, a Raman Fiber Amplifier (RFA) is one of the important approaches for solving the above problems due to its characteristics of high gain, wide spectrum, narrow pulse, and corresponding time of only sub picosecond. However, the existing cascade structure raman amplifier, forward multi-pump raman amplifier, hybrid amplifier and the like have defects of too much noise, large flatness fluctuation range or complex structure and the like introduced into the system respectively.
Disclosure of Invention
The utility model aims to provide a backward pumping Raman fiber amplifier based on tellurate glass fiber, which not only can realize high gain, low flatness and low noise, but also can be flexibly applied to each position of optical fiber communication network amplification.
In order to achieve the purpose, the utility model provides the following scheme:
a backward pumping Raman fiber amplifier based on tellurate glass fiber is respectively connected with a plurality of optical transmitters and a plurality of optical receivers, and comprises:
the combiner is connected with each optical transmitter and is used for coupling the signal light with different wavelengths emitted by each optical transmitter to generate coupled signal light;
the pump laser is used for emitting pump light with different wavelengths;
the optical coupler is connected with the pump laser and is used for coupling the pump light to generate coupled pump light;
the tellurate glass optical fiber is respectively connected with the wave combiner and the optical coupler and used for providing a gain medium for a stimulated Raman scattering effect between the coupled signal light and the coupled pump light, and the coupled signal light and the coupled pump light generate amplified signal light and residual pump light after the stimulated Raman scattering effect occurs;
the band elimination filter is used for filtering the residual pump light and transmitting the amplified signal light;
and the wave splitter is respectively connected with the band elimination filter and each optical receiver and is used for separating the amplified signal light transmitted by the band elimination filter into single light beams with different wavelengths and transmitting the single light beams to each optical receiver for receiving.
Optionally, the number of the pump lasers is plural.
Optionally, when the number of the pump lasers is 4, the pump lasers are respectively a first pump laser, a second pump laser, a third pump laser and a fourth pump laser;
the wavelength of the first pump laser is 1429.4162nm, and the power of the first pump laser is 0.0071 w;
the wavelength of the second pump laser is 1440.2533nm, and the power of the second pump laser is 0.0867 w;
the wavelength of the third pump laser is 1444.7234nm, and the power of the third pump laser is 0.2598 w;
the wavelength of the fourth pump laser is 1463.6060nm, and the power of the fourth pump laser is 1.7179 w.
Optionally, the tellurite glass fiber is a TBZN-type tellurite glass fiber.
Optionally, the TBZN-type tellurite glass fiber has a length of 25 m.
According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects:
the utility model adopts the excitation mode of injecting the optical fiber into the backward pump to enable the output gain flatness of the Raman optical fiber amplifier to reach an extremely low value, simultaneously adopts the tellurate glass optical fiber as a gain medium, has a higher Raman gain coefficient by one order of magnitude compared with different optical fibers such as quartz optical fiber, commonly used photonic crystal optical fiber and the like, obviously improves the gain effect, and adopts a band-stop filter to filter redundant residual pump light to reduce the influence of noise and realize the amplification of low-noise signal light; meanwhile, the Raman fiber amplifier structure of the utility model is a discrete amplifier, and can be flexibly applied to each position of the amplification of the optical fiber communication network.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a backward pumping Raman fiber amplifier based on tellurate glass fiber according to the present invention;
FIG. 2 is a Raman gain spectrum of a TBZN type tellurate glass fiber according to an embodiment of the present invention;
fig. 3 is a backward pumping RFA output gain diagram of a TBZN-type tellurate glass fiber according to an embodiment of the present invention.
Description of the symbols:
the optical fiber coupling device comprises an optical transmitter-1, a first optical fiber-2, a wave combiner-3, a tellurate glass optical fiber-4, an optical coupler-5, a second optical fiber-6, a pump laser-7, a third optical fiber-8, a band-stop filter-9, a fourth optical fiber-10, a wave splitter-11, a fifth optical fiber-12 and an optical receiver-13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model aims to provide a backward pumping Raman fiber amplifier based on tellurate glass fiber, which not only can realize high gain, low flatness and low noise, but also can be flexibly applied to each position of optical fiber communication network amplification.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the backward pumping raman fiber amplifier based on tellurite glass fiber of the present invention is connected to a plurality of optical transmitters 1 and a plurality of optical receivers 13, respectively. The backward pumping Raman fiber amplifier based on the tellurate glass fiber comprises: the device comprises a wave combiner 3, a pumping laser 7, an optical coupler 5, a tellurite glass optical fiber 4, a band-stop filter 9 and a wave splitter 11.
Specifically, the combiner 3 is connected to each of the optical transmitters 1, and the combiner 3 is configured to couple signal light with different wavelengths emitted by each of the optical transmitters 1 to generate coupled signal light; the pump laser 7 is used for emitting pump light with different wavelengths; the optical coupler 5 is connected with the pump laser 7, and the optical coupler 5 is used for coupling the pump light to generate coupled pump light; the tellurate glass fiber 4 is respectively connected with the wave combiner 3 and the optical coupler 5, the tellurate glass fiber 4 is used for providing a gain medium for a stimulated Raman scattering effect between the coupled signal light and the coupled pump light, and the coupled signal light and the coupled pump light generate amplified signal light and residual pump light after the stimulated Raman scattering effect occurs; the band-stop filter 9 is used for filtering the residual pump light and transmitting the amplified signal light; the demultiplexer 11 is connected to the band elimination filter 9 and each optical receiver 13, and the demultiplexer 11 is configured to separate the amplified signal light transmitted by the band elimination filter 9 into single light beams with different wavelengths, and transmit the single light beams to each optical receiver 13 for reception.
Further, the number of the pump lasers 7 is plural, and when the number of the pump lasers 7, the set power, and the set wavelength are different, the output gain of the amplified signal light is also different.
And when the number of the pump lasers is 4, the first pump laser, the second pump laser, the third pump laser and the fourth pump laser are respectively used.
Wherein the first pump laser: wavelength lambdap11429.4162 nm; power p1＝0.0071w。
A second pump laser: wavelength lambdap21440.2533 nm; power p2＝0.0867w。
A third pump laser: wavelength lambdap31444.7234 nm; power p3＝0.2598w。
A fourth pump laser: wavelength lambdap41463.6060 nm; power p4＝1.7179w。
In the present embodiment, the tellurite glass fiber 4 is a TBZN-type tellurite glass fiber. Preferably, the length of the TBZN tellurate optical fiber is as follows: and L is 25 m.
Further, as shown in fig. 1, the backward pumping raman fiber amplifier based on tellurite glass fiber of the present invention further includes: a first optical fiber 2. The first optical fiber 2 is respectively connected with each optical transmitter 1 and the combiner 3, and the first optical fiber 2 is used for transmitting signal light with different wavelengths emitted by each optical transmitter 1 to the combiner 3.
Further, as shown in fig. 1, the backward pumping raman fiber amplifier based on tellurite glass fiber of the present invention further includes: a second optical fiber 6. The second optical fiber 6 is respectively connected to the optical coupler 5 and the pump laser 7, and the second optical fiber 6 is used for transmitting the pump light with different wavelengths emitted by the pump laser 7 to the optical coupler 5.
Further, as shown in fig. 1, the backward pumping raman fiber amplifier based on tellurite glass fiber of the present invention further includes: a third optical fiber 8. The third optical fiber 8 is respectively connected with the tellurate glass optical fiber 4 and the band-stop filter 9, and the third optical fiber 8 is used for transmitting the amplified signal light and the residual pump light generated by the tellurate glass optical fiber 4 to the band-stop filter 9.
Further, as shown in fig. 1, the backward pumping raman fiber amplifier based on tellurite glass fiber of the present invention further includes: a fourth optical fiber 10. The fourth optical fiber 10 is respectively connected to the band-stop filter 9 and the wave splitter 11, and the fourth optical fiber 10 is configured to transmit the amplified signal light in the band-stop filter 9 to the wave splitter 11.
Further, as shown in fig. 1, the backward pumping raman fiber amplifier based on tellurite glass fiber of the present invention further includes: a fifth optical fiber 12. The fifth optical fiber 12 is connected to each of the optical receivers 13 and the demultiplexer 11, and the fifth optical fiber 12 is configured to transmit signal light with different wavelengths in the demultiplexer 11 to each of the optical receivers 13.
The first optical fiber 2, the second optical fiber 6, the third optical fiber 8, the fourth optical fiber 10, and the fifth optical fiber 12 are all conventional single-mode optical fibers and are only used for transmission of different segments of signal light.
Wherein the central wavelength lambda of the optical transmitter 1i1530 and 1565nm, i is the serial number of the optical transmitter. The power of the optical transmitter 1 is 0.01mw each.
Specifically, the present invention takes 51 optical transmitters 1, 51 optical receivers 13, and 4 pump lasers 7 as an example, and the operation principle thereof is explained:
4 paths of pumping light emitted by 4 pumping lasers 7 are transmitted into a light coupler 5 through a second optical fiber 6 and enter the tail end of a tellurate glass optical fiber 4(TBZN tellurate glass optical fiber) after being coupled, 51 paths of signal light with different wavelengths emitted by a light emitter 1 are transmitted through a first optical fiber 2 to reach the input end of a wave combiner 3 and are coupled into the front end of the tellurate glass optical fiber 4 through the wave combiner, and the two signals are transmitted in the tellurate glass optical fiber 4. When the signal light and the pump light do not meet, the energy of the signal light is slowly attenuated in the first optical fiber 2 due to various losses until the signal light and the pump light meet in the tellurite glass optical fiber 4, the coupled signal light is amplified through the stimulated Raman scattering effect (the pump light with short wavelength emitted by the coupled pump light is subjected to energy transfer, and the energy of the coupled pump light is transferred to the coupled signal light with long wavelength), and the energy of the coupled pump light is reduced due to the transfer. Subsequently, the amplified coupled signal light (i.e., amplified signal light) and the coupled pump light (i.e., residual pump light) after the self energy is transferred are input to the input end of the band elimination filter 9 together through the third optical fiber 8, the band elimination filter 9 filters the residual pump light, and only the output of the amplified signal light is reserved. Amplified signal light output by the band elimination filter 9 is input into the wave splitter 11 through the fourth optical fiber 10, the wave splitter 11 is connected with the optical receiver 13 through the fifth optical fiber 12, and the wave splitter 11 separates out 51 paths of required signal light and transmits the signal light to the optical receiver 13, so that the amplification process of the whole signal light is completed.
Refer to the Raman gain diagram of the gain medium of Raman fiber amplifier, TBZN type tellurate glass fiber, shown in FIG. 2. Its Raman frequency shift range is [0, 1100]cm-1In this way, amplification of different degrees can be achieved when the frequency difference between the pump light and the signal light is within this range. When amplifying the signal light of C wave band, selecting [300, 800 ]]cm-1The curve of the range is exaggerated. Therefore, the utility model can only use a part of the gain spectrum of the TBZN type tellurate optical fiber as an amplification gain medium under the excitation of only four backward pumps in the structure, thereby realizing the pairAnd amplifying the C-band signal light.
Referring to fig. 3, which is a graph showing the backward pumping RFA output gain of the TBZN type tellurate glass fiber, it can be seen from fig. 3 that the average gain reaches 23.7388dB, and the gain flatness is only 0.2098 dB.
In summary, the present invention employs a backward multi-pump injection fiber to make the output gain flatness of the raman amplifier reach a very low value, and on this basis, optimization is performed to obtain a more ideal output flatness, which is significantly reduced, and a band-stop filter is employed to filter out the redundant residual pump light to reduce the influence of noise, thereby realizing low-noise signal light amplification. Meanwhile, the Raman amplifier of the embodiment has a simple structure and is easy to disassemble, so that the Raman amplifier can be used as a discrete amplifier and can be flexibly applied to each amplification position of an optical fiber communication network. Meanwhile, the spectral width of the Raman gain spectrum of the TBZN type tellurate glass optical fiber reaches 1000cm-1The Raman amplifier applied to the embodiment can effectively widen the feasible bandwidth of the amplifier, has the gain coefficient as high as 3.8 multiplied by 10 < -12 > m/W, is higher by one order of magnitude compared with the Raman gain coefficients of different fibers such as quartz fibers, common photonic crystal fibers and the like, and obviously improves the gain effect.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.
Claims (5)
1. A backward pumping Raman fiber amplifier based on tellurate glass fiber is respectively connected with a plurality of optical transmitters and a plurality of optical receivers, and is characterized in that the backward pumping Raman fiber amplifier based on tellurate glass fiber comprises:
the combiner is connected with each optical transmitter and is used for coupling the signal light with different wavelengths emitted by each optical transmitter to generate coupled signal light;
the pump laser is used for emitting pump light with different wavelengths;
the optical coupler is connected with the pump laser and is used for coupling the pump light to generate coupled pump light;
the tellurate glass optical fiber is respectively connected with the wave combiner and the optical coupler and used for providing a gain medium for a stimulated Raman scattering effect between the coupled signal light and the coupled pump light, and the coupled signal light and the coupled pump light generate amplified signal light and residual pump light after the stimulated Raman scattering effect occurs;
the band elimination filter is used for filtering the residual pump light and transmitting the amplified signal light;
and the wave splitter is respectively connected with the band elimination filter and each optical receiver and is used for separating the amplified signal light transmitted by the band elimination filter into single light beams with different wavelengths and transmitting the single light beams to each optical receiver for receiving.
2. The backward pumped raman fiber amplifier based on tellurite glass fiber according to claim 1, characterized in that the number of said pump lasers is plural.
3. The tellurate glass fiber-based backward pumping Raman fiber amplifier according to claim 2, wherein the first, second, third and fourth pump lasers are respectively provided when the number of the pump lasers is 4;
the wavelength of the first pump laser is 1429.4162nm, and the power of the first pump laser is 0.0071 w;
the wavelength of the second pump laser is 1440.2533nm, and the power of the second pump laser is 0.0867 w;
the wavelength of the third pump laser is 1444.7234nm, and the power of the third pump laser is 0.2598 w;
the wavelength of the fourth pump laser is 1463.6060nm, and the power of the fourth pump laser is 1.7179 w.
4. The backward pumping raman fiber amplifier based on tellurate glass fiber according to claim 1, wherein the tellurate glass fiber is TBZN type tellurate glass fiber.
5. The backward pumping Raman fiber amplifier based on tellurate glass fiber according to claim 4, wherein the length of the TBZN type tellurate glass fiber is 25 m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024183442A1 (en) * | 2023-03-03 | 2024-09-12 | 武汉光迅科技股份有限公司 | Amplification apparatus and method for optical signal, and optical communication system |
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| WO2024183442A1 (en) * | 2023-03-03 | 2024-09-12 | 武汉光迅科技股份有限公司 | Amplification apparatus and method for optical signal, and optical communication system |
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