CN111929964A - Combined amplification method and device of few-mode parameter and strong coupling Raman - Google Patents
Combined amplification method and device of few-mode parameter and strong coupling Raman Download PDFInfo
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- CN111929964A CN111929964A CN202010999307.2A CN202010999307A CN111929964A CN 111929964 A CN111929964 A CN 111929964A CN 202010999307 A CN202010999307 A CN 202010999307A CN 111929964 A CN111929964 A CN 111929964A
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- 230000003321 amplification Effects 0.000 title claims abstract description 29
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 29
- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 20
- 238000010168 coupling process Methods 0.000 title claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000008878 coupling Effects 0.000 title claims abstract description 11
- 239000000835 fiber Substances 0.000 claims abstract description 30
- 239000013307 optical fiber Substances 0.000 claims abstract description 27
- 230000010287 polarization Effects 0.000 claims abstract description 19
- 238000005516 engineering process Methods 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 238000005086 pumping Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 6
- 238000001228 spectrum Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F1/395—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves in optical waveguides
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- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a combined amplification method of few-mode parameters and strong coupling Raman, which comprises the following steps: carrying out signal modulation on the signal light to obtain four kinds of polarization mode signal light; enabling the four polarization mode signal lights to enter the few-mode optical fiber through a photon lantern mode division multiplexing technology; performing signal modulation on the pump light to obtain four kinds of polarization mode pump light, and coupling the four kinds of light into the long tapered fiber; the pump light after coupling output is coupled into a coupler through phase matching and signal light after being output by the few-mode optical fiber, and then the pump light is input into an amplifier; and (4) uniformly outputting the obtained amplified light through a photon lantern. The invention also discloses a combined amplification device of few-mode parameters and strong coupling Raman. The invention realizes the amplification of high gain and large bandwidth of signal light; the amplified light beam has higher signal-to-noise ratio and better light beam quality, the performance of the optical fiber communication system is effectively improved, and the transmission distance of the optical fiber communication system is increased.
Description
Technical Field
The invention relates to an optical amplification technology in the field of communication, in particular to a combined amplification method and a combined amplification device of few-mode parameters and strong-coupling Raman.
Background
With the rapid development of services such as cloud computing, big data, network television and the like and the arrival of the 5G era, the requirements on the transmission capacity, the transmission rate and the transmission distance of an optical fiber communication system are higher and higher. In order to meet the requirements of optical fiber communication systems, multiplexing technologies such as optical time division multiplexing, wavelength division multiplexing, polarization multiplexing, space division multiplexing, dense wavelength division multiplexing, etc. are continuously proposed and applied to the expansion of optical communication systems, however, for optical fiber communication systems with long-distance transmission, the refraction and scattering of light beams, and the scattering and absorption of optical waves by optical fibers will cause the transmitted signals to be attenuated, the performance of the optical fiber communication systems is deteriorated, and the information of the original signals cannot be accurately received at the receiving end. In order to ensure the transmission quality of the optical fiber communication system, an optical amplifier is added to amplify the signal during the signal transmission process, so that the signal can be transmitted over a long distance.
Currently, optical amplifiers used at home and abroad mainly include the following three types: erbium-doped fiber amplifiers, fiber Raman amplifiers, and fiber parametric amplifiers. The erbium-doped fiber amplifier has uneven gain and narrow gain bandwidth, and can only amplify light with wavelength of about 1550 nm; the disadvantage of fiber raman amplifiers is the relatively low gain per unit length; the phase matching of the optical fiber parametric amplifier in the optical fiber parametric amplification is difficult, and the gain spectrum is hump-shaped, the center is sunken, and the flat gain cannot be realized. The design of an amplification mode with a flat gain spectrum by using the three different amplifiers becomes a problem to be solved urgently at present.
Disclosure of Invention
The purpose of the invention is as follows: in view of the above problems, the present invention provides a combined amplification method of few-mode parameters and strongly coupled raman for equalizing gain, and another object of the present invention is to provide a combined amplification device of few-mode parameters and strongly coupled raman.
The technical scheme is as follows: the invention relates to a combined amplification method of few-mode parameters and strong coupling Raman, which comprises the following steps:
s1: carrying out signal modulation on the signal light to obtain four kinds of polarization mode signal light;
s2: enabling the four polarization mode signal lights to enter the few-mode optical fiber through a photon lantern mode division multiplexing technology;
s3: performing signal modulation on the pump light to obtain four kinds of polarization mode pump light, and coupling the four kinds of light into the long tapered fiber; s4: the pump light after coupling output in the S3 is coupled into a coupler through phase matching and signal light after being output by the S2 few-mode optical fiber to realize the process of optical fiber parametric amplification, the signal light is amplified with large bandwidth and high gain, and then output light is input into an amplifier;
s5: the amplified light obtained at S4 is equalized and output through a photonic lantern.
The modes of the four polarization mode signal lights in step S1 are LP01、LP11、LP21、LP02Since the signal light of these four modes is orthogonal, there are fewThe intermodal dispersion in a mode fiber is almost zero.
The step S3 polarization mode pump light has the same mode as the step S1 polarization mode signal light.
The step S4 amplifier includes a few-mode fiber, a coupler and a pump light source, the signal light enters the coupler after passing through the few-mode fiber, the pump light in the same mode is injected reversely, backward raman amplification is realized, the raman amplification gain spectrum is opposite to the parametric amplification gain spectrum by adjusting the wavelength of the pump light, and thus balanced gain for the signal light is realized.
A combined amplification device of few-mode parameters and strong-coupling Raman comprises a signal light source, a first photon lantern, few-mode optical fibers, a first pump light source, a phase matcher, a first coupler, an amplifier and a second photon lantern,
the signal light source generates signal light, the signal light is input into the first photon lantern after being modulated by signals, and the output signal light is input into the few-mode optical fiber; the pumping light source generates pumping light, the pumping light is input into the long tapered fiber after signal modulation, output light is incident to the phase matcher, the pumping light after phase matching and signal light output from the few-mode fiber are incident to the amplifier through the coupler to obtain amplified light, and finally the amplified light is output through the second photon lantern.
The amplifier comprises a few-mode fiber, a second coupler and a second pump light source, wherein signal light enters the second coupler after passing through the few-mode fiber, and pump light in the same mode is injected reversely.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
1. the invention utilizes the optical fiber parametric amplification technology and the backward Raman amplification technology to realize the amplification of high gain and large bandwidth of the signal light, thereby realizing the balanced gain of the signal light of four different modes;
2. the noise of the pump light source of the reverse pump is averaged in the transmission process, the signal-to-noise ratio of the amplified light beam is higher, the quality of the light beam is better, the performance of the optical fiber communication system is effectively improved, and the transmission distance of the optical fiber communication system is increased.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
Detailed Description
The combined amplification method of few-mode parameters and strong coupling Raman described in this embodiment includes the following steps:
s1: signal modulation is carried out on the signal light to obtain four kinds of polarization mode signal light, respectively LP 012、LP 113、LP 214、LP 025。
S2: the four polarization mode signal lights enter the few-mode optical fiber 10 through the photon lantern mode division multiplexing technology.
S3: performing signal modulation on the pump light to obtain four kinds of pump light with polarization modes, respectively LP 012、LP 113、LP 214、LP 025. These four types of light are coupled into a long tapered fiber 6.
S4: and (3) the pump light coupled and output in the S3 is coupled into a coupler through phase matching with the signal light output by the S2 few-mode optical fiber 10 to realize optical fiber parametric amplification, the signal light is amplified with large bandwidth and high gain, and then the output light is input into an amplifier. The amplifier comprises a few-mode fiber, a coupler and a pumping light source, signal light enters the coupler after passing through the few-mode fiber, pumping light in the same mode is injected reversely, backward Raman amplification is achieved, the Raman amplification gain spectrum is opposite to the parametric amplification gain spectrum by adjusting the wavelength of the pumping light, and then balanced gain of the signal light is achieved.
S5: the amplified light obtained at S4 is equalized and output through a photonic lantern.
As shown in fig. 1, the combined amplification device of few-mode parameter and strong-coupling raman according to the present embodiment includes a signal light source 8, a first photon lantern 9, a first few-mode fiber 10, a first pump light source 1, a phase matcher 7, a first coupler 11, an amplifier, and a second photon lantern 13, where the signal light source 8 generates signal light, the signal light is modulated by a signal and then input to the first photon lantern 9, and the output signal light is input to the first few-mode fiber 10; the first pump light source 1 generates pump light, the pump light is input to the long tapered fiber 6 after signal modulation, output light is incident to the phase matcher 7, the pump light after phase matching and signal light output from the first few-mode fiber 10 are incident to the amplifier through the first coupler 11 to obtain amplified light, and finally the amplified light is output through the second photon lantern 13. The amplifier comprises a few-mode fiber, a second coupler 12 and a second pump light source 14, wherein signal light enters the second coupler 12 after passing through the few-mode fiber, and pump light in the same mode is injected reversely.
Claims (6)
1. A combined amplification method of few-mode parameters and strong-coupling Raman is characterized by comprising the following steps:
s1: carrying out signal modulation on the signal light to obtain four kinds of polarization mode signal light;
s2: enabling the four polarization mode signal lights to enter the few-mode optical fiber through a photon lantern mode division multiplexing technology;
s3: performing signal modulation on the pump light to obtain four kinds of polarization mode pump light, and coupling the four kinds of light into a long tapered fiber (6);
s4: the pump light after being coupled and output in the S3 is coupled into a coupler through phase matching with the signal light after being output by the S2 few-mode optical fiber, and then the output light is input into an amplifier;
s5: the amplified light obtained at S4 is equalized and output through a photonic lantern.
2. The method of claim 1, wherein the modes of the four polarization mode signal lights of step S1 are LP01（2）、LP11（3）、LP21（4）、LP02（5）。
3. The method of claim 1, wherein the step S3 polarization mode pump light and the step S1 polarization mode signal light have the same mode.
4. The method of claim 1, wherein the step S4 amplifier comprises a few-mode fiber, a coupler and a pump light source, and the signal light enters the coupler after passing through the few-mode fiber, and the pump light of the same mode is injected in reverse.
5. A combined amplification device of few-mode parameters and strong-coupling Raman is characterized by comprising a signal light source (8), a first photon lantern (9), few-mode optical fibers, a first pump light source (1), a phase matcher (7), a first coupler (11), an amplifier and a second photon lantern (13), wherein the signal light source (8) generates signal light, the signal light is input into the first photon lantern (9) after being modulated by signals, and the output signal light is input into the few-mode optical fibers; the first pump light source (1) generates pump light, the pump light is input to the long tapered fiber (6) after signal modulation, output light is incident to the phase matcher (7), the pump light after phase matching and signal light output from the few-mode fiber are incident to the amplifier through the coupler to obtain amplified light, and finally the amplified light is output through the second photon lantern (13).
6. The device of claim 5, wherein the amplifier comprises a few-mode fiber, a second coupler (12) and a second pump light source (14), and the signal light enters the second coupler (12) after passing through the few-mode fiber, and the pump light of the same mode is injected in a reverse direction.
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| CN202010999307.2A CN111929964A (en) | 2020-09-22 | 2020-09-22 | Combined amplification method and device of few-mode parameter and strong coupling Raman |
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| CN202010999307.2A CN111929964A (en) | 2020-09-22 | 2020-09-22 | Combined amplification method and device of few-mode parameter and strong coupling Raman |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089580A (en) * | 2021-11-12 | 2022-02-25 | 南京信息工程大学 | Novel few-mode loop wavelength conversion device |
| CN114499676A (en) * | 2022-03-16 | 2022-05-13 | 南京信息工程大学 | Signal transmission method based on mode cycle conversion |
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|---|---|---|---|---|
| CN102103300A (en) * | 2001-08-16 | 2011-06-22 | 艾利森电话股份有限公司 | Optical amplifier |
| CN102844689A (en) * | 2010-01-27 | 2012-12-26 | 中弗罗里达州大学研究基金会 | Optical transmission using few-mode fibers |
| WO2016103200A2 (en) * | 2014-12-23 | 2016-06-30 | Eni S.P.A. | Optical fiber vibration measurement system in multiphase flows with related method to monitor multiphase flows |
| CN111664881A (en) * | 2020-07-24 | 2020-09-15 | 南京信息工程大学 | Bidirectional distributed sensing system and method based on multi-core few-mode optical fiber |
-
2020
- 2020-09-22 CN CN202010999307.2A patent/CN111929964A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103300A (en) * | 2001-08-16 | 2011-06-22 | 艾利森电话股份有限公司 | Optical amplifier |
| CN102844689A (en) * | 2010-01-27 | 2012-12-26 | 中弗罗里达州大学研究基金会 | Optical transmission using few-mode fibers |
| WO2016103200A2 (en) * | 2014-12-23 | 2016-06-30 | Eni S.P.A. | Optical fiber vibration measurement system in multiphase flows with related method to monitor multiphase flows |
| CN111664881A (en) * | 2020-07-24 | 2020-09-15 | 南京信息工程大学 | Bidirectional distributed sensing system and method based on multi-core few-mode optical fiber |
Non-Patent Citations (5)
| Title |
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| JIAXIONG LI等: "Experimental demonstration of a few-mode Raman amplifier with a flat gain covering 1530–1605 nm", 《OPTICS LETTERS》 * |
| JIAXIONG LI等: "Ultra-Low-Noise Mode-Division Multiplexed WDM Transmission Over 100-km FMF Based on a Second-Order Few-Mode Raman Amplifier", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089580A (en) * | 2021-11-12 | 2022-02-25 | 南京信息工程大学 | Novel few-mode loop wavelength conversion device |
| CN114499676A (en) * | 2022-03-16 | 2022-05-13 | 南京信息工程大学 | Signal transmission method based on mode cycle conversion |
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