CN117134183A - Erbium-doped fiber laser for self-organizing feedback Brillouin laser and production method thereof - Google Patents
Erbium-doped fiber laser for self-organizing feedback Brillouin laser and production method thereof Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims abstract description 105
- 238000004519 manufacturing process Methods 0.000 title abstract description 4
- 239000006096 absorbing agent Substances 0.000 claims abstract description 26
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 25
- 238000005086 pumping Methods 0.000 claims description 29
- 239000013307 optical fiber Substances 0.000 claims description 25
- 230000002269 spontaneous effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 229910052691 Erbium Inorganic materials 0.000 claims description 9
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000003321 amplification Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1086—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using scattering effects, e.g. Raman or Brillouin effect
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06791—Fibre ring lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/083—Ring lasers
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- Optics & Photonics (AREA)
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Abstract
The application provides an erbium-doped fiber laser for self-organizing feedback Brillouin laser and a production method thereof. The ultra-narrow linewidth Brillouin erbium-doped fiber laser with the wavelength being randomly adjustable is realized. The light transmitted in two directions on the saturated absorber is used to interfere with each other to form stable standing wave, namely, a self-organizing feedback narrow-band dynamic grating is generated, and the central wavelength of the grating is related to the parameters of the cavity and the light wave transmitted in the cavity. The bandwidth of the self-organizing feedback dynamic grating is extremely narrow, the central wavelength of the self-organizing feedback dynamic grating is determined by the parameters of the cavity and the light transmitted in the cavity, and the central wavelength of the filter is not required to be adjusted manually.
Description
Technical Field
The application belongs to the technical field of fiber lasers, and particularly relates to an erbium-doped fiber laser for self-organizing feedback Brillouin laser and a generation method thereof.
Background
The Brillouin erbium-doped fiber laser (BEFL) combines the characteristics of the narrow linewidth of the Brillouin fiber laser and the high power (about 10 mW) of the erbium-doped fiber laser (EDFL), is a novel ultra-narrow linewidth fiber laser source, and can be applied to a high-precision interference type fiber sensing system, a coherent optical communication system and the like.
The traditional Brillouin erbium-doped fiber laser (BEFL) needs hundreds of meters of single-mode fiber as a gain medium, the cavity length is too long, the mode jump is easy, and stable single-frequency Brillouin laser is the key point of BEFL research. The patent application with publication number of CN102361210A discloses a single-frequency ultra-narrow linewidth Brillouin erbium-doped fiber laser, which adopts a single-mode fiber with the length smaller than 10m, increases the longitudinal mode interval (about 10 MHz) so that only one laser mode exists in a Brillouin gain spectrum, and further realizes stable single-frequency BEFL output. Patent application publication No. CN102946041A discloses a tunable single-polarization ultra-narrow linewidth Brillouin erbium-doped fiber laser, which utilizes 4m erbium-doped fiber to serve as a Brillouin gain medium and provide linear erbium-doped fiber amplification so as to realize single longitudinal mode output of an ultra-short annular cavity BEFL. To suppress the intra-cavity spontaneous emission and to ensure that the laser operates in the BEFL mode, tunable narrow band filters are typically introduced into the BEFL cavity. In addition, by adjusting the brillouin pump wavelength and the narrow band filter center wavelength simultaneously, a brillouin erbium doped fiber laser (BEFL) can achieve tunable laser output.
The disadvantage of the above solution is that each time the operating wavelength of the brillouin erbium doped fiber laser (BEFL) is changed, the center wavelength of the filter needs to be adjusted to match the wavelength of the brillouin pump light, which results in the brillouin erbium doped fiber laser being inconvenient to use.
Disclosure of Invention
Aiming at the problems existing in the prior art, the application provides an erbium-doped fiber laser for self-organizing feedback Brillouin laser and a production method thereof, and aims to realize an ultra-narrow linewidth Brillouin erbium-doped fiber laser with randomly adjustable wavelength.
In order to achieve the technical purpose, the application adopts the following technical scheme:
an erbium-doped fiber laser for self-organizing feedback Brillouin laser comprises a narrow linewidth pump laser, an erbium-doped fiber pump light source, a saturated absorber and a laser cavity formed by connecting a first circulator, a wavelength division multiplexer, a first erbium-doped fiber, a second circulator and a fiber coupler;
the narrow linewidth pump laser is connected to a first port of the first circulator, a second port of the first circulator is connected with a reflection port of the wavelength division multiplexer, the erbium-doped fiber pump light source is connected with a passband port of the wavelength division multiplexer, and a public port of the wavelength division multiplexer is connected with a first end of the first erbium-doped fiber; the second end of the first erbium-doped fiber is connected with a third port of the fiber coupler;
the first port of the second circulator is connected with the third port of the first circulator, and the second port of the second circulator is connected with the saturated absorber; the third port of the second circulator is connected with the first port of the optical fiber coupler (8), and the fourth port of the optical fiber coupler outputs laser, wherein the saturated absorber is used for bidirectionally transmitting light, and the bidirectionally transmitted light on the saturated absorber interferes with each other to form stable standing waves, so that a self-organized feedback narrow-band dynamic grating is generated.
Further, the saturated absorber is a section of unpumped second erbium-doped fiber, the second port of the second circulator is connected to the first end of the second erbium-doped fiber, and the second end of the second erbium-doped fiber is a reflecting end for reflecting the optical signal from the first end of the second erbium-doped fiber back. Preferably, the second end of the second erbium doped fiber is plated with a metal reflective film.
Further, the saturated absorber may also be a Sagnac loop consisting of an unpumped second erbium-doped fiber.
Further, the pumping mode of the first erbium-doped fiber is not limited, and may be single forward pumping, single backward pumping or bidirectional pumping.
Further, the erbium-doped fiber pump light source is a semiconductor laser with wavelength of 980nm or 1480 nm.
Further, the narrow linewidth pump laser is a semiconductor laser or an optical fiber laser, and the wavelength is located in the C band.
In another aspect, the present application provides a method for generating self-organizing feedback brillouin laser, which is based on any one of the erbium-doped fiber lasers for self-organizing feedback brillouin laser, to generate and output brillouin laser.
Specifically, light output by the narrow linewidth pump laser enters the first erbium-doped optical fiber through the first circulator and the wavelength division multiplexer, and is used as the Brillouin pump light to excite and carry out Brillouin amplification on the narrow-band backward stimulated Brillouin scattered light on the first erbium-doped optical fiber, and the frequency of the backward stimulated Brillouin scattered light and the frequency of the narrow linewidth pump laser have a fixed frequency difference, and the frequency difference is called Brillouin frequency shift;
the light output by the erbium-doped fiber pumping light source enters the first erbium-doped fiber through the wavelength division multiplexer and linearly amplifies the backward stimulated Brillouin scattered light;
the first erbium-doped fiber is pumped by an erbium-doped fiber pumping light source and generates spontaneous emission noise light with a wide spectrum; the backward stimulated Brillouin scattering light and spontaneous emission noise light on the first erbium-doped fiber enter a saturated absorber through the first circulator and the second circulator, light transmitted in two directions on the saturated absorber mutually interferes to form stable standing waves and generate a self-organized feedback narrow-band dynamic grating, and the self-organized feedback dynamic grating has a filtering effect, can inhibit most spontaneous emission noise in a laser cavity and prevents the laser cavity from generating an erbium-doped fiber laser mode; the center wavelength of the self-organizing feedback dynamic grating is matched with the wavelength of the backward stimulated Brillouin scattering light, the backward stimulated Brillouin scattering light is not filtered, and part of the backward stimulated Brillouin scattering light is output out of the laser cavity after passing through the optical fiber coupler, and the other part of the backward stimulated Brillouin scattering light returns into the laser cavity to be amplified continuously;
the process is repeated circularly, and the backward stimulated Brillouin scattering light forms stable oscillation in the laser cavity and continuously outputs Brillouin laser to the outside of the laser cavity.
When the Brillouin pumping wavelength changes by changing narrow linewidth pumping lasers with different wavelengths, the backward stimulated Brillouin scattering wavelength in the laser cavity correspondingly changes, and the center wavelength of the self-organizing feedback dynamic grating correspondingly changes, so that the random Brillouin laser wavelength output of the erbium-doped fiber laser is realized.
The Brillouin erbium-doped fiber laser using the conventional tunable filter has to adjust the center wavelength of the filter to match with the Brillouin laser or the Brillouin pump light before operation, otherwise, the Brillouin laser is filtered by the filter, and the Brillouin laser cannot be formed in the cavity. If the narrow linewidth pump laser is replaced, that is, the wavelength of the pump laser is changed, the center wavelength of the filter needs to be adjusted, otherwise, the laser cannot work.
In order to overcome the defects, the self-organizing feedback Brillouin erbium-doped fiber laser provided by the application utilizes the mutual interference of light transmitted in two directions on a saturated absorber to form stable standing waves, namely, a self-organizing feedback narrow-band dynamic grating is generated, and the central wavelength of the grating is related to the parameters of a cavity and light waves transmitted in the cavity. The bandwidth of the self-organizing feedback dynamic grating is extremely narrow, the central wavelength of the self-organizing feedback dynamic grating is determined by the parameters of the cavity and the light transmitted in the cavity, the central wavelength of a filter does not need to be adjusted manually, and most of spontaneous radiation noise can be filtered, and the laser can be ensured to work in a Brillouin laser mode. When the narrow linewidth pumping laser, namely the Brillouin pumping light wavelength is changed, the backward stimulated Brillouin scattering light wavelength in the cavity is correspondingly changed, and the center wavelength of the self-organizing feedback dynamic grating is correspondingly changed, so that the Brillouin erbium-doped fiber laser with arbitrary wavelength output without manual filter adjustment is realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of the present application;
reference numerals in the drawings:
1. a narrow linewidth pump laser;
2. a first circulator; 21. a first circulator first port; 22. a first circulator second port; 23. a first circulator third port;
3. a wavelength division multiplexer; 31. a reflection port of the wavelength division multiplexer; 32. passband ports of the wavelength division multiplexer; 33. a common port of the wavelength division multiplexer;
4. an erbium-doped fiber pump light source;
5. a first erbium-doped fiber;
6. a second circulator; 61. a second circulator first port; 62. a second circulator second port; 63. a second circulator third port;
7. a saturated absorber;
8. an optical fiber coupler; 81. a fiber coupler first port; 82. a second port of the fiber optic coupler; 83. a third port of the fiber coupler; 84. and a fourth port of the fiber coupler.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed description of the preferred embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the spirit of the present disclosure will be clearly described in the following drawings and detailed description, and any person skilled in the art, after having appreciated the embodiments of the present disclosure, may make alterations and modifications by the techniques taught by the present disclosure without departing from the spirit and scope of the present disclosure. The exemplary embodiments of the present application and the descriptions thereof are intended to illustrate the present application, but not to limit the present application.
An embodiment provides an erbium-doped fiber laser for self-organizing feedback Brillouin laser, which comprises a narrow linewidth pump laser 1, an erbium-doped fiber pump light source 4, a saturation absorber 7 and a laser cavity formed by connecting a first circulator 2, a wavelength division multiplexer 3, a first erbium-doped fiber 5, a second circulator 6 and a fiber coupler 8;
the narrow linewidth pump laser 1 is connected to a first port 21 of a first circulator 2, a second port 22 of the first circulator 2 is connected to a reflection port 31 of the wavelength division multiplexer 3, the erbium-doped fiber pump light source 4 is connected to a passband port 32 of the wavelength division multiplexer, and a public port 33 of the wavelength division multiplexer 3 is connected to a first end of the first erbium-doped fiber 5; a second end of the first erbium doped fiber 5 is connected to a third port 83 of the fiber coupler 8;
the first port 61 of the second circulator 6 is connected with the third port 23 of the first circulator 2, and the second port 62 of the second circulator 6 is connected with the saturated absorber 7; the third port 63 of the second circulator 6 is connected to the first port 81 of the optical fiber coupler 8, and the fourth port 84 of the optical fiber coupler 8 outputs laser light, wherein the saturated absorber is used for bi-directionally transmitting light, and the bi-directionally transmitted light on the saturated absorber interferes with each other to form a stable standing wave, so as to generate a self-organized feedback narrow-band dynamic grating.
The implementation manner of the saturated absorber 7 is not limited, and may be a section of unpumped second erbium-doped fiber, as shown in fig. 1, where the second port 62 of the second circulator 6 is connected to a first end of the second erbium-doped fiber, and the second end of the second erbium-doped fiber is a reflective end, and is configured to reflect the optical signal from the first end of the second erbium-doped fiber back to the optical signal path. Such as a second end of the second erbium doped fiber, is coated with a metal reflective film. The second erbium-doped fiber is not pumped, and is used as a saturated absorber to form a narrow-band dynamic grating, so that light in a laser cavity is subjected to self-adaptive filtering, and spontaneous radiation noise in the cavity is restrained, and therefore the narrow-linewidth pumping laser with any wavelength can excite Brillouin laser oscillation in the cavity.
Alternatively, the saturated absorber 7 may be a Sagnac loop consisting of an unpumped second erbium-doped fiber.
The pumping mode of the first erbium-doped fiber 5 in the present application is not limited, and may be single forward pumping, single backward pumping or bidirectional pumping.
The erbium-doped fiber pump light source 4 in the application is a semiconductor laser with wavelength of 980nm or 1480 nm. The narrow linewidth pump laser 1 is a semiconductor laser or an optical fiber laser, and the wavelength is located in a C band.
The method for outputting the Brillouin laser by the erbium-doped fiber laser for self-organizing feedback of the Brillouin laser comprises the following steps: light output by the narrow-linewidth pump laser 1 enters the first erbium-doped optical fiber 5 through the first circulator 2 and the wavelength division multiplexer 3, and is used as Brillouin pump light to excite narrow-band backward stimulated Brillouin scattered light on the first erbium-doped optical fiber 5 and carry out Brillouin amplification, and the frequency of the backward stimulated Brillouin scattered light and the frequency of the narrow-linewidth pump laser 1) have a fixed frequency difference, and the frequency difference is called Brillouin frequency shift-11 GHz@1550nm;
the light output by the erbium-doped fiber pumping light source 4 enters the first erbium-doped fiber 5 through the wavelength division multiplexer 3 and linearly amplifies the backward stimulated Brillouin scattered light;
the first erbium-doped fiber 5 is pumped by the erbium-doped fiber pumping light source 4 and generates spontaneous emission noise light of a wide spectrum; the backward stimulated Brillouin scattering light and spontaneous emission noise light on the first erbium-doped optical fiber 5 enter the second erbium-doped optical fiber through the first circulator 2 and the second circulator 6, the second end of the second erbium-doped optical fiber is plated with a metal reflecting film, the light which is transmitted in two directions on the second erbium-doped optical fiber is mutually interfered to form stable standing waves and generate a narrow-band dynamic grating with self-organized feedback, and the self-organized feedback dynamic grating has a filtering effect, can inhibit most spontaneous emission noise in a laser cavity and prevent the generation of an erbium-doped optical fiber laser mode in the laser cavity; the center wavelength of the self-organizing feedback dynamic grating is matched with the wavelength of the backward stimulated Brillouin scattering light, the backward stimulated Brillouin scattering light is not filtered, and part of the backward stimulated Brillouin scattering light is output out of the laser cavity after passing through the optical fiber coupler 8, and the other part of the backward stimulated Brillouin scattering light returns into the laser cavity to be amplified continuously;
the process is repeated circularly, and the backward stimulated Brillouin scattering light forms stable oscillation in the laser cavity and continuously outputs Brillouin laser to the outside of the laser cavity. The fact that the center wavelength of the self-organizing feedback dynamic grating is matched with the wavelength of the backward stimulated Brillouin scattering light means that the wavelength of the backward stimulated Brillouin scattering light is located in the passband range of the self-organizing feedback dynamic grating.
When the Brillouin pumping wavelength changes by changing narrow linewidth pumping lasers with different wavelengths, the backward stimulated Brillouin scattering wavelength in the laser cavity correspondingly changes, and the center wavelength of the self-organizing feedback dynamic grating correspondingly changes, so that the random Brillouin laser wavelength output of the erbium-doped fiber laser is realized.
The application is not a matter of the known technology.
The technical features of the above embodiments may be arbitrarily combined, and for brevity, all of the possible combinations of the technical features of the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description of the present specification;
the foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application; it should be noted that it is possible for a person skilled in the art to make several variants and modifications without departing from the concept of the application, all of which fall within the scope of protection of the application; accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. The self-organizing feedback Brillouin laser erbium-doped fiber laser is characterized by comprising a narrow linewidth pumping laser (1), an erbium-doped fiber pumping light source (4), a saturated absorber (7) and a laser cavity formed by connecting a first circulator (2), a wavelength division multiplexer (3), a first erbium-doped fiber (5), a second circulator (6) and a fiber coupler (8);
the narrow linewidth pump laser (1) is connected to a first port (21) of the first circulator (2), a second port (22) of the first circulator (2) is connected to a reflection port (31) of the wavelength division multiplexer (3), the erbium-doped fiber pump light source (4) is connected to a passband port (32) of the wavelength division multiplexer, and a common port (33) of the wavelength division multiplexer (3) is connected to a first end of the first erbium-doped fiber (5); the second end of the first erbium-doped fiber (5) is connected with a third port (83) of the fiber coupler (8);
the first port (61) of the second circulator (6) is connected with the third port (23) of the first circulator (2), and the second port (62) of the second circulator (6) is connected with the saturated absorber (7); the third port (63) of the second circulator (6) is connected with the first port (81) of the optical fiber coupler (8), and the fourth port (84) of the optical fiber coupler (8) outputs laser, wherein the saturated absorber is used for bidirectionally transmitting light, and the bidirectionally transmitted light on the saturated absorber interferes with each other to form stable standing waves, so that a self-organizing feedback narrow-band dynamic grating is generated.
2. The self-organizing feedback brillouin laser according to claim 1, wherein the saturated absorber (7) is a length of unpumped second erbium-doped fiber, the second port (62) of the second circulator (6) is connected to the first end of the second erbium-doped fiber (7), and the second end of the second erbium-doped fiber (7) is a reflective end for reflecting the optical signal from the first end of the second erbium-doped fiber (7) back.
3. A self-organising feedback brillouin laser as claimed in claim 2, characterised in that the second end of the second erbium doped fibre (7) is coated with a metallic reflective film.
4. The self-organizing feedback brillouin laser erbium doped fiber laser according to claim 1, characterized in that the saturated absorber (7) is a Sagnac loop of unpumped second erbium doped fiber.
5. The self-organizing feedback brillouin laser of claim 1 or 2 or 3 or 4, wherein the first erbium-doped fiber (5) is pumped in a single forward pumping, a single backward pumping or a bi-directional pumping.
6. The self-organizing feedback brillouin laser erbium-doped fiber laser according to claim 5, characterized in that the erbium-doped fiber pump light source (4) is a semiconductor laser with a wavelength of 980nm or 1480 nm.
7. The self-organizing feedback brillouin laser erbium-doped fiber laser according to claim 6, wherein the narrow linewidth pump laser (1) is a semiconductor laser or a fiber laser, and the wavelength is in the C-band.
8. A method for generating a self-organizing feedback brillouin laser, characterized in that an erbium-doped fiber laser based on the self-organizing feedback brillouin laser according to claim 1 or 2 or 3 or 4 or 6 or 7 generates and outputs the brillouin laser.
9. The method for generating the self-organizing feedback brillouin laser according to claim 8, wherein the light output by the narrow linewidth pump laser (1) enters the first erbium-doped optical fiber (5) through the first circulator (2) and the wavelength division multiplexer (3), and the light is used as brillouin pump light to excite and brillouin amplify the narrow-band backward stimulated brillouin scattered light on the first erbium-doped optical fiber (5), and the frequency of the backward stimulated brillouin scattered light and the frequency of the narrow linewidth pump laser (1) have a fixed frequency difference, and the frequency difference is called brillouin frequency shift;
the light output by the erbium-doped fiber pumping light source (4) enters the first erbium-doped fiber (5) through the wavelength division multiplexer (3) and linearly amplifies the backward stimulated Brillouin scattered light;
the first erbium-doped fiber (5) is pumped by the erbium-doped fiber pumping light source (4) and generates spontaneous emission noise light with a wide spectrum; the backward stimulated Brillouin scattering light and spontaneous emission noise light on the first erbium-doped optical fiber (5) enter a saturated absorber (7) through the first circulator (2) and the second circulator (6), the light which is transmitted in two directions on the saturated absorber (7) is mutually interfered to form stable standing waves and generate a self-organized feedback narrow-band dynamic grating, and the self-organized feedback dynamic grating has a filtering effect, can inhibit most of spontaneous emission noise in a laser cavity and prevent the generation of an erbium-doped optical fiber laser mode in the laser cavity; the center wavelength of the self-organizing feedback dynamic grating is matched with the wavelength of the backward stimulated Brillouin scattering light, the backward stimulated Brillouin scattering light is not filtered, and part of the backward stimulated Brillouin scattering light is output out of the laser cavity through the optical fiber coupler (8), and the other part of the backward stimulated Brillouin scattering light returns into the laser cavity to be amplified continuously;
the process is repeated circularly, and the backward stimulated Brillouin scattering light forms stable oscillation in the laser cavity and continuously outputs Brillouin laser to the outside of the laser cavity.
10. The method for generating self-organizing feedback brillouin laser according to claim 9, wherein the center wavelength of the self-organizing feedback dynamic grating is related to the brillouin pumping light wavelength, when the brillouin pumping light wavelength is changed by changing the narrow linewidth pumping lasers with different wavelengths, that is, the backward stimulated brillouin scattering light wavelength in the laser cavity is changed correspondingly, and the center wavelength of the self-organizing feedback dynamic grating is changed correspondingly, so that the arbitrary brillouin laser wavelength output of the erbium-doped fiber laser is realized.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117833001A (en) * | 2024-03-01 | 2024-04-05 | 中北大学 | Tunable narrow linewidth self-excited Brillouin fiber laser |
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2023
- 2023-09-13 CN CN202311179261.XA patent/CN117134183A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117833001A (en) * | 2024-03-01 | 2024-04-05 | 中北大学 | Tunable narrow linewidth self-excited Brillouin fiber laser |
| CN117833001B (en) * | 2024-03-01 | 2024-05-10 | 中北大学 | Tunable narrow linewidth self-excited Brillouin fiber laser |
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