CN115986544A - Stimulated Brillouin scattering suppression device and method - Google Patents
Stimulated Brillouin scattering suppression device and method Download PDFInfo
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- CN115986544A CN115986544A CN202310006018.1A CN202310006018A CN115986544A CN 115986544 A CN115986544 A CN 115986544A CN 202310006018 A CN202310006018 A CN 202310006018A CN 115986544 A CN115986544 A CN 115986544A
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- 230000001629 suppression Effects 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 69
- 239000013307 optical fiber Substances 0.000 claims abstract description 45
- 230000008646 thermal stress Effects 0.000 claims abstract description 17
- 230000000737 periodic effect Effects 0.000 claims abstract description 12
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 17
- 239000000835 fiber Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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- 230000002401 inhibitory effect Effects 0.000 description 1
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Abstract
The invention provides a stimulated Brillouin scattering suppression device which comprises an optical fiber and a random resistance heating wire, wherein the random resistance heating wire is wound outside the optical fiber and heats the optical fiber, when a random resistance wire is electrified and has the same current I, the generated heat is used for calculating the time t of Q = I2R randomly through a formula, and the obtained heat is also random; random heating generates random heat distribution in the optical fiber, thereby causing random thermal stress in the radial direction of the optical fiber; the random resistance heating wire is wound on the surface of the optical fiber, the thermal stress of the optical fiber is introduced through heating, the random thermal stress field is superposed with a periodic acoustic wave field causing Brillouin scattering, the periodicity of the acoustic wave field is destroyed, so that the periodic coupling between laser and backward Brillouin scattering light is broken, and the generation of the stimulated Brillouin scattering is inhibited. The invention adopts a simple random heating mode to destroy the periodic acoustic field, has simple operation and can fundamentally inhibit the generation of the stimulated Brillouin scattering.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a stimulated Brillouin scattering suppression device and a method thereof.
Background
The stimulated brillouin scattering is mainly generated because the incident light is very high in power, ultrasonic waves are excited in a substance by an electromagnetic stretching effect generated by light waves, and the incident light is scattered by the ultrasonic waves. When the strong pumping laser field is injected into the medium, the electrostrictive effect of the light wave field starts to act, so that the acoustic vibration (phonon) of some states in the medium is greatly enhanced, the enhanced acoustic wave field also enhances the scattering effect on the injected laser, and the acoustic wave field, the laser wave field and the scattered light wave field of the laser exist in the medium at the same time and are mutually coupled. When the intensity of the incident laser reaches a threshold value, the enhancement effect of the acoustic wave field and the scattered light wave field in the medium compensates respective loss effect, the stimulated amplification or oscillation effect of the induction acoustic wave field and the Brillouin scattered light wave field is generated, and the scattered light has the characteristics of stimulated emission such as small divergence angle, narrow line width and the like, so that the stimulated Brillouin scattering is realized.
In the narrow linewidth laser, after the laser intensity reaches a certain value, a stimulated Brillouin scattering effect is caused, and the effect can cause forward-transmitted laser to excite backward-transmitted scattered laser, so that the transmission and amplification of the narrow linewidth laser are influenced.
The phase modulation method in the prior art, such as CN111564750A, is a system and method for suppressing the stimulated brillouin scattering effect in a high-power, narrow-linewidth fiber laser amplifier; an inclined grating method, e.g., CN109378687A, a stimulated brillouin scattering suppression method of a fiber laser amplifier system; magnetic doping in combination with an external magnetic field, such as CN102608829A, is a preferred method for suppressing stimulated brillouin scattering of a pulsed laser beam in an optical fiber.
The prior art is complex to operate, high in technical difficulty and high in cost.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, the main object of the present invention is to solve the above-mentioned problems in the prior art by introducing a random thermal stress region in the radial direction of an optical fiber by randomly heating the optical fiber, so as to break a periodic acoustic wave field caused by an electrostrictive effect when a narrow-linewidth laser is transmitted in a medium, thereby reducing the energy coupling between the laser and a scattered light wave field of the laser, and playing a role in suppressing stimulated brillouin scattering.
The invention provides a stimulated Brillouin scattering suppression device, which comprises an optical fiber and a random resistance heating wire,
the random resistance heating wire is wound outside the optical fiber and heats the optical fiber, and because the resistances R of the random resistance heating wire are distributed randomly, when the random resistance wire is electrified and the same current I is carried out, the generated heat is calculated by a formula, and the time t of Q = I2R is random, so that the obtained heat is also random;
the random heating produces a random thermal distribution within the optical fiber, thereby causing random thermal stress in the radial direction of the optical fiber; the random resistance heating wire is wound on the surface of the optical fiber, the thermal stress of the optical fiber is introduced through heating, the random thermal stress field is superposed with a periodic acoustic wave field causing Brillouin scattering, the periodicity of the acoustic wave field is destroyed, so that the periodic coupling between laser and backward Brillouin scattering light is broken, and the generation of the stimulated Brillouin scattering is inhibited.
The invention also provides an operation method adopting the stimulated brillouin scattering suppression device, which comprises the following steps:
and 3, electrifying the random resistance heating wire, and heating.
Further, the random resistance heating wire is wound on the surface of the optical fiber, and the thermal stress of the optical fiber is introduced by heating.
Further, the random resistance heating wire is formed by randomly connecting resistance wires with the same diameter and different resistance values in series.
Further, the diameter of the random resistance heating wire is changed according to the diameter of the optical fiber, so that the purpose of facilitating winding is achieved; the diameter of the random resistance heating wire is 100 micrometers-5 millimeters.
Further, the resistance value of the random resistance heating wire is randomly selected, and the resistance value is not limited.
Further, the lengths of all sections of the random resistance heating wires are random when the random resistance heating wires are spliced, and are 1mm-100cm.
The method of the invention has the following advantages:
the invention adopts a simple random heating mode to generate a random stress area in the optical fiber, thereby destroying the periodic acoustic wave field, the method has simple operation, and the generation of the stimulated Brillouin scattering can be fundamentally inhibited.
Drawings
FIG. 1 is a schematic diagram of stimulated Brillouin scattering generation;
fig. 2 is a schematic diagram of the suppression of stimulated brillouin scattering by fiber heating.
Wherein the method comprises the following steps: 1-Stokes scattered light; 2-pump light; interaction of 3-Stokes light with pump light; 4-sound waves; 5-heating wires; 6-an optical fiber; 7-random resistance heating wire.
Detailed Description
Preferred embodiments of the present invention will be described in detail with reference to the following examples. It is to be understood that the following examples are given for illustrative purposes only and are not intended to limit the scope of the present invention. Various modifications and substitutions may be made by those skilled in the art without departing from the spirit and scope of the invention, and all such modifications and substitutions are intended to be within the scope of the claims.
As shown in fig. 1, when the pump light 2 of the pump laser field is incident into the medium, the electrostrictive effect of the optical wave field starts to act, so that the acoustic frequency vibration (phonon) of some states in the medium is greatly enhanced, the sound wave 4 of the enhanced acoustic wave field enhances the scattering effect on the incident laser in turn, and the sound wave 4 of the acoustic wave field, the pump light 2 of the laser wave field and the Stokes scattering light 1 of the laser scattering optical wave field exist in the medium at the same time and are coupled with each other. When the intensity of the incident laser reaches a threshold value, the respective loss effects are compensated by the enhancement effect of the acoustic wave 4 of the acoustic wave field in the medium and the Stokes scattered light 1 of the scattered light wave field, the stimulated amplification or oscillation effect of the induced acoustic wave field and the Brillouin scattered light wave field is generated, and the interaction 3 of the Stokes light and the pumping light is generated.
The invention designs a stimulated Brillouin scattering suppression device, as shown in figure 2, firstly, resistance heating wires 5 with different resistance values are connected together in a random length and sequence random collocation manner to manufacture a random resistance heating wire 7 with randomly distributed resistors. The random thermal stress area is introduced into the optical fiber 6 in the radial direction in a random optical fiber heating mode, so that a periodic acoustic wave field caused by an electrostrictive effect when narrow-linewidth laser is transmitted in a medium is broken, the energy coupling between the laser and a scattered light wave field of the laser is reduced, and the effect of inhibiting stimulated Brillouin scattering is achieved.
In fig. 2, the present invention mainly includes two parts, i.e., an optical fiber 6 and a random resistance heating wire 7, the random resistance heating wire 7 is wound outside the optical fiber 6, and the random resistance heating wire 7 is responsible for heating the optical fiber 6, because the resistances (R) thereof are randomly distributed, when the heating wire is energized, and the same current (I) is applied, the generated heat is calculated by a formula (Q = I2R random t) to obtain the heat which is also random. This random heating creates a random thermal distribution within the fiber, causing random thermal stresses in the fiber in the radial direction. The heating wire is wound on the surface of the optical fiber, the thermal stress of the optical fiber is introduced through heating, the random thermal stress field is superposed with the periodic acoustic wave field causing the Brillouin scattering, the periodicity of the acoustic wave field is destroyed, the periodic coupling between the laser and the backward Brillouin scattering light is broken, and the generation of the stimulated Brillouin scattering is inhibited.
The invention also provides an operation method adopting the stimulated brillouin scattering inhibition device, which comprises the following steps:
and 3, electrifying the heating wire and heating.
The invention winds the heating wire on the surface of the optical fiber and introduces the thermal stress of the optical fiber by heating.
The heating wire is formed into a random resistance heating wire by randomly connecting resistance wires with the same diameter and different resistances in series.
The diameter of the heating wire is changed according to the diameter of the optical fiber, so that the purpose of facilitating winding is achieved. The diameter of the heating wire is 100 micrometers-5 millimeters.
The resistance value of the heating wire is randomly selected, and is not limited.
When the heating wires are spliced, the length of each segment is random and is 1mm-100cm.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. A stimulated Brillouin scattering suppression device is characterized by comprising an optical fiber and a random resistance heating wire,
the random resistance heating wire is wound outside the optical fiber and heats the optical fiber, and because the resistances R of the random resistance heating wire are distributed randomly, when the random resistance wire is electrified and the same current I is carried out, the generated heat is calculated by a formula, and the time t of Q = I2R is random, so that the obtained heat is also random;
the random heating produces a random thermal distribution within the optical fiber, thereby causing random thermal stress in the radial direction of the optical fiber; the random resistance heating wire is wound on the surface of the optical fiber, the thermal stress of the optical fiber is introduced through heating, the random thermal stress field is superposed with a periodic acoustic wave field causing Brillouin scattering, the periodicity of the acoustic wave field is destroyed, so that the periodic coupling between laser and backward Brillouin scattering light is broken, and the generation of the stimulated Brillouin scattering is inhibited.
2. An operation method using the stimulated brillouin scattering suppression apparatus according to claim 1, characterized by comprising:
step 1, preparing a random resistance heating wire;
step 2, winding the random resistance heating wire on the surface of an optical fiber;
and 3, electrifying the random resistance heating wire, and heating.
3. The method of claim 2, wherein the random resistance heating wire is wound around the surface of the optical fiber to induce optical fiber thermal stress by heating.
4. The method of claim 3, the random resistance heating wire is formed by randomly connecting resistance wires with the same diameter and different resistance values in series.
5. The method according to claim 4, wherein the diameter of the random resistance heating wire is varied according to the diameter of the optical fiber for the purpose of facilitating winding; the diameter of the random resistance heating wire is 100 micrometers-5 millimeters.
6. The method according to claim 5, wherein the resistance value of the random resistance heating wire is randomly selected and is not limited.
7. The method of claim 6, wherein the random resistance heating wire is spliced at random lengths of 1mm to 100cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310006018.1A CN115986544A (en) | 2023-01-04 | 2023-01-04 | Stimulated Brillouin scattering suppression device and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060109877A1 (en) * | 2004-06-21 | 2006-05-25 | Caton John W | External cavity laser with adaptive fiber bragg grating (FBG) for minimizing noise related to stimulated brillouin scattering (SBS) in dispersive fiber links |
| US20080198880A1 (en) * | 2007-02-21 | 2008-08-21 | Deep Photonics Corporation | Method and apparatus for increasing fiber laser output power |
| JP2009151253A (en) * | 2007-12-25 | 2009-07-09 | Nippon Telegr & Teleph Corp <Ntt> | Stimulated brillouin scattering suppressing method and optical fiber cable |
| CN102314041A (en) * | 2011-09-01 | 2012-01-11 | 华北电力大学（保定） | Suppression method of stimulated Brillouin scattering in optical fiber |
| CN106451046A (en) * | 2016-11-17 | 2017-02-22 | 深圳番越光电有限公司 | Compact type linear-polarization and single-frequency all-fiber laser amplifier |
-
2023
- 2023-01-04 CN CN202310006018.1A patent/CN115986544A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060109877A1 (en) * | 2004-06-21 | 2006-05-25 | Caton John W | External cavity laser with adaptive fiber bragg grating (FBG) for minimizing noise related to stimulated brillouin scattering (SBS) in dispersive fiber links |
| US20080198880A1 (en) * | 2007-02-21 | 2008-08-21 | Deep Photonics Corporation | Method and apparatus for increasing fiber laser output power |
| JP2009151253A (en) * | 2007-12-25 | 2009-07-09 | Nippon Telegr & Teleph Corp <Ntt> | Stimulated brillouin scattering suppressing method and optical fiber cable |
| CN102314041A (en) * | 2011-09-01 | 2012-01-11 | 华北电力大学（保定） | Suppression method of stimulated Brillouin scattering in optical fiber |
| CN106451046A (en) * | 2016-11-17 | 2017-02-22 | 深圳番越光电有限公司 | Compact type linear-polarization and single-frequency all-fiber laser amplifier |
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