CN112117629A - All-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device - Google Patents

All-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device Download PDF

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CN112117629A
CN112117629A CN202011008816.0A CN202011008816A CN112117629A CN 112117629 A CN112117629 A CN 112117629A CN 202011008816 A CN202011008816 A CN 202011008816A CN 112117629 A CN112117629 A CN 112117629A
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mode
fiber
acousto
erbium
doped
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曾祥龙
徐江韬
张龙坤
张亮
陆佳峰
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University of Shanghai for Science and Technology
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    • 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
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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    • 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
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    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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    • 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
    • H01S3/1068—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 an acousto-optical device
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    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1608—Solid materials characterised by an active (lasing) ion rare earth erbium
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    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
    • H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre

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Abstract

The invention discloses an all-fiber high-order mode Brillouin erbium-doped laser based on an acousto-optic device, which comprises: tunable narrow linewidth laser light source, circulator, erbium-doped fiber pump light source, wavelength division multiplexer, erbium-doped fiber, spectrum analyzer, fiber mode selection coupler, few-mode fiber, and acousto-optic device; the tunable narrow linewidth laser light source, the circulator, the wavelength division multiplexer, the erbium-doped optical fiber, the optical fiber mode selection coupler, the few-mode optical fiber and the acousto-optic device are sequentially connected, and the acousto-optic device is connected with the circulator; the erbium-doped optical fiber pumping light source is connected with the wavelength division multiplexer 5, and the spectrum analyzer is connected with the optical fiber mode selection coupler. The invention can effectively reduce the threshold value of Brillouin pumping, realize the Brillouin output of a high-order mode and the tunability of output wavelength, realize the output of a dynamic mode and greatly reduce the manufacturing cost.

Description

All-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device
Technical Field
The invention relates to the technical field of fiber lasers, in particular to an all-fiber high-order mode Brillouin erbium-doped laser based on an acousto-optic device.
Background
The Brillouin optical fiber laser has a good line width compression characteristic, and the line width compression characteristic can be used in the field of coherent communication. Meanwhile, the Brillouin optical fiber laser has the Brillouin frequency shift characteristic, and the Brillouin frequency shift characteristic is usually used in the field of distributed optical fiber sensing, for example, used for manufacturing the BOTDR of the Brillouin optical time domain meter. And the optical signal to noise ratio of the Brillouin laser is very high, noise can be suppressed, and the Brillouin laser can be used in an interference type optical fiber sensing system.
On the other hand, brillouin lasers also have some disadvantages to be solved, which are high pumping threshold and low output power, and to solve the above disadvantages, brillouin erbium doped lasers have been proposed, which have both the advantages of low pumping threshold and high output power, and are relatively easy to implement. Most of the research on the brillouin laser at present focuses on its line width compression and shortening of cavity length, and there is little research on the high-order mode output of the brillouin laser. Two methods for studying high-order mode output of brillouin exist at the present stage, one is to use two mode selection couplers to realize mode conversion outside the cavity, but the pumping threshold of the brillouin laser realized by the method is very high, and the wavelength cannot be tuned. The other method is to use two photon lanterns to realize the output of the high-order mode Brillouin laser, and the method has high cost, needs few-mode optical fibers with the length of one thousand meters, has low purity of the output mode, and cannot realize the dynamic switching of the high-order mode. Namely, both of the above methods have certain drawbacks.
In summary, finding a high-order mode brillouin laser with a low brillouin pumping threshold and a tunable wavelength is an urgent technical problem to be solved at present.
Disclosure of Invention
The invention aims to provide an all-fiber high-order mode Brillouin erbium-doped laser based on an acousto-optic device, which aims to solve the technical problems in the prior art, effectively reduce the threshold value of Brillouin pumping, realize the tunable output of Brillouin output and output wavelength of a high-order mode, realize the output of a dynamic mode and greatly reduce the manufacturing cost.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an all-fiber high-order mode Brillouin erbium-doped laser based on an acousto-optic device, which comprises: tunable narrow linewidth laser light source, circulator, erbium-doped fiber pump light source, wavelength division multiplexer, erbium-doped fiber, spectrum analyzer, fiber mode selection coupler, few-mode fiber, and acousto-optic device;
the tunable narrow linewidth laser light source, the circulator, the wavelength division multiplexer, the erbium-doped optical fiber, the optical fiber mode selection coupler, the few-mode optical fiber and the acousto-optic device are sequentially connected, and the acousto-optic device is connected with the circulator; the erbium-doped optical fiber pumping light source is connected with the wavelength division multiplexer, and the spectrum analyzer is connected with the optical fiber mode selection coupler.
Preferably, the circulator is provided with three ports, namely a circulator first port, a circulator second port and a circulator third port; the first port of the circulator is connected with the tunable narrow-linewidth laser light source, the second port of the circulator is connected with the wavelength division multiplexer, and the third port of the circulator is connected with the acousto-optic device.
Preferably, the wavelength division multiplexer is provided with three ports, namely a reflection port of the wavelength division multiplexer, a pass band port of the wavelength division multiplexer and a common port of the wavelength division multiplexer; the wavelength division multiplexer reflection port is connected with the circulator, the wavelength division multiplexer pass band port is connected with the erbium-doped optical fiber pump light source, and the wavelength division multiplexer public port is connected with the erbium-doped optical fiber.
Preferably, the optical fiber mode selective coupler is provided with three ports, namely a single-mode input end of the optical fiber mode selective coupler, a few-mode input end of the optical fiber mode selective coupler and a few-mode output end of the optical fiber mode selective coupler; the single-mode input end of the optical fiber mode selection coupler is connected with the erbium-doped optical fiber; the few-mode input end of the optical fiber mode selection coupler is the output end of the Brillouin erbium-doped laser and is connected with the optical spectrum analyzer; and the few-mode output end of the optical fiber mode selection coupler is connected with the few-mode optical fiber.
Preferably, the brillouin erbium-doped laser further includes two polarization controllers, which are a first polarization controller and a second polarization controller, respectively, where the first polarization controller is disposed between the tunable narrow linewidth laser light source and the circulator, and the second polarization controller is disposed between the optical fiber mode selective coupler and the few-mode optical fiber.
Preferably, the acousto-optic device comprises an aluminum cone, a piezoelectric ceramic piece, a signal generator and a voltage amplifier which are connected in sequence; the signal generator is used for generating radio frequency signals, the voltage amplifier is used for amplifying the radio frequency signals and loading the radio frequency signals to the piezoelectric ceramic plate, the piezoelectric ceramic plate drives the aluminum cone to vibrate to cause an acoustic grating effect, and the light signal is completed from LP01Mode to LP11And (4) switching modes.
Preferably, the optical fiber mode selection coupler is formed by coupling a single mode optical fiber and a few-mode optical fiber according to a preset core mode.
Preferably, the tunable narrow linewidth laser light source is a semiconductor laser or a fiber laser; the tuning wavelength of the tunable narrow linewidth laser light source is in a C wave band.
Preferably, the output wavelength of the brillouin erbium-doped laser is adjusted by synchronously changing the light source of the tunable narrow linewidth laser and the center wavelength of the mode conversion of the acousto-optic device; wherein the center wavelength of the mode conversion of the acousto-optic device is adjusted by changing the input frequency of the signal generator.
Preferably, the center wavelength of the acousto-optic device mode conversion is coincident with the center wavelength of the tunable narrow linewidth laser light source.
The invention discloses the following technical effects:
the all-fiber high-order mode Brillouin erbium-doped laser based on the acousto-optic device can effectively reduce the threshold value of Brillouin pumping due to the addition of the erbium-doped fiber and the erbium-doped fiber pumping light source; meanwhile, due to the existence of the acousto-optic device and the optical fiber mode selection coupler, the Brillouin output of a high-order mode can be realized. In addition, the invention can realize the function of tuning the output wavelength by simultaneously tuning the mode conversion central wavelength of the acousto-optic device and the central wavelength of the tunable narrow linewidth laser light source; the invention can also control the existence of the vibration by opening or closing the signal generator, thereby realizing the function of switching the output of the dynamic mode and greatly reducing the manufacturing cost.
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 structural diagram of an all-fiber high-order mode Brillouin erbium-doped laser based on an acousto-optic device according to the present invention;
FIG. 2 is a graph of a spectrum received by a spectrum analyzer in an embodiment of the present invention;
fig. 3 is a corresponding graph of the input power of the erbium-doped fiber pump light source and the output power of the brillouin erbium-doped laser when the output wavelength of the tunable narrow linewidth laser light source is fixed and the output power is 10mW in the embodiment of the present invention;
FIG. 4 is a comparison of the input frequencies of the signal generator at 0kHz and 918kHz, respectively, for the output modes of the few-mode input end of the fiber mode selection coupler according to an embodiment of the present invention;
the optical fiber polarization amplifier comprises a tunable narrow linewidth laser light source 1, a first polarization controller 2, a circulator 3, an erbium-doped fiber pump light source 4, a wavelength division multiplexer 5, an erbium-doped fiber 6, a spectrum analyzer 7, a fiber mode selection coupler 8, a polarization controller 9, a few-mode fiber 10, an acousto-optic device 11, a circulator first port 31, a circulator second port 32, a circulator third port 33, a wavelength division multiplexer reflection port 51, a wavelength division multiplexer pass-band port 52, a wavelength division multiplexer common port 53, an optical fiber mode selection coupler single-mode input end 81, an optical fiber mode selection coupler few-mode input end 82, an optical fiber mode selection coupler few-mode output end 83, a conical aluminum, B, a piezoelectric ceramic chip, C, a signal generator and D, and a voltage amplifier.
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.
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.
Referring to fig. 1, the present embodiment provides an all-fiber high-order mode brillouin erbium-doped laser based on an acousto-optic device, including: the device comprises a tunable narrow-linewidth laser light source 1, two polarization controllers, a circulator 3, an erbium-doped fiber pump light source 4, a wavelength division multiplexer 5, an erbium-doped fiber 6, a spectrum analyzer 7, a fiber mode selection coupler 8, a few-mode fiber 10 and an acousto-optic device 11;
the circulator 3 is provided with three ports, namely a circulator first port 31, a circulator second port 32 and a circulator third port 33; the wavelength division multiplexer 5 is provided with three ports, namely a wavelength division multiplexer reflection port 51, a wavelength division multiplexer pass band port 52 and a wavelength division multiplexer common port 53; the optical fiber mode selection coupler 8 is provided with three ports, namely a single-mode input end 81 of the optical fiber mode selection coupler, a few-mode input end 82 of the optical fiber mode selection coupler and a few-mode output end 83 of the optical fiber mode selection coupler;
the tunable narrow linewidth laser light source 1 is connected with the circulator first port 31 through a single mode fiber, the circulator second port 32 is connected with the wavelength division multiplexer reflection port 51 through a single mode fiber, the erbium-doped fiber pump light source 4 is connected with the wavelength division multiplexer passband port 52 through a single mode fiber, the wavelength division multiplexer common port 53 is connected with the erbium-doped fiber 6 through a single mode fiber and then connected with the fiber mode selection coupler single mode input end 81 through a single mode fiber, the fiber mode selection coupler few-mode output end 83 is connected with the few-mode fiber 10 through a few-mode fiber, the few-mode fiber 10 is connected with the output end of the acousto-optic device 11 through a few-mode fiber, and the input end of the acousto-optic device 11 is connected with the circulator third port 33 through a single mode fiber; the fiber mode selection coupler few-mode input end 82 is connected with the spectrum analyzer 7. In which a single-mode fibre supports only one mode in its operating band, the fundamental mode (LP)01Mode).
The polarization controller comprises a first polarization controller 2 and a second polarization controller 9, the first polarization controller 2 is arranged between the tunable narrow linewidth laser light source 1 and the circulator first port 31, the second polarization controller 9 is arranged between the optical fiber mode selection coupler few-mode output end 83 and the few-mode optical fiber 10, and the output of laser is ensured by adjusting the first polarization controller 2 and the second polarization controller 9.
The acousto-optic device 11 comprises an aluminum cone A, a piezoelectric ceramic piece B, a signal generator C and a voltage amplifier D which are sequentially connected; the signal generator C generates a radio frequency signal, the radio frequency signal is amplified by the voltage amplifier D and then loaded to the piezoelectric ceramic piece B, the piezoelectric ceramic piece B drives the aluminum cone A to vibrate to cause an acoustic grating effect, and an optical signal is completed from LP01Mode to LP11And (4) switching modes.
The optical fiber mode selection coupler 8 is formed by coupling a single mode optical fiber and a few-mode optical fiber according to a preset fiber core mode, wherein the coupling ratio of the single mode optical fiber and the few-mode optical fiber is selected according to actual requirements. The fiber mode selective coupler 8 enables slave LP01Mode to LP11Can also realize the mode conversion from LP11Mode to LP01The mode of (2) is switched.
Further optimizing the scheme, the tunable narrow linewidth laser light source 1 is a semiconductor laser or a fiber laser; the tuning wavelength of the tunable narrow linewidth laser light source 1 is in a C wave band (the frequency is from 4.0 to 8.0 GHz); the output wavelength of the erbium-doped brillouin laser can be changed by synchronously changing the center wavelengths of the tunable narrow linewidth laser light source 1 and the mode conversion of the acousto-optic device 11. Wherein the center wavelength of the mode conversion of the acousto-optic device 11 is varied by varying the input frequency of the signal generator C.
In a further optimized scheme, the center wavelength of the mode conversion of the acousto-optic device 11 is consistent with the center wavelength of the tunable narrow linewidth laser light source 1.
In a further optimized scheme, all the optical fibers used in the acousto-optic device 11 are few-mode optical fibers.
In a further optimized scheme, the length of the erbium-doped fiber 6 is 0.8 m; the erbium doped fiber 6 can also be selected to have different lengths according to actual requirements.
In a further optimized scheme, the length of the few-mode optical fiber 10 is more than 500 meters and less than 4 kilometers.
In a further optimized scheme, the erbium-doped fiber pump light source 4 is a 980nm semiconductor laser.
The working principle of the all-fiber high-order mode Brillouin erbium-doped laser based on the acousto-optic device is as follows:
the optical signal output by the tunable narrow linewidth laser light source 1 is input through the first port 31 of the circulator, output from the second port 32 of the circulator, and transmitted to the reflection port 51 of the wavelength division multiplexer through the single mode fiber, and is transmitted from the wavelength division multiplexer together with the optical signal emitted by the erbium-doped fiber pump light source 4The common port 53 outputs and is amplified by the erbium doped fiber 6; the amplified light beam passes through a fiber mode selective coupler 8 and passes through LP01Mode conversion to LP11Mode, LP11After passing through the second polarization controller 9, the optical signal of the mode excites Stimulated Brillouin Scattering (SBS) on the few-mode fiber 10 to generate backward stokes light, which has a LP transfer mode11Mode, LP11The stokes light of a mode is split into two optical signals by the fiber mode selective coupler 8: one path outputs LP through single mode input 81 of fiber mode selective coupler01The Stokes light of the mode is amplified by the erbium-doped fiber 6, then input into the second port 32 of the circulator and output LP from the third port 33 of the circulator01Mode Stokes light, LP01The Stokes light of the mode is converted into LP by the acousto-optic device 1111Mode, LP11Stokes light of the mode is transmitted to the optical fiber mode selection coupler 8 after passing through the few-mode optical fiber 10 to form a counterclockwise cycle; the other path outputs LP through the few-mode input end 82 of the optical fiber mode selection coupler11Mode stokes light. When the power input by the tunable narrow linewidth laser light source 1 and the erbium-doped fiber pump light source 4 reaches the threshold of the brillouin erbium-doped laser, the few-mode input end 82 of the fiber mode selection coupler outputs an optical signal, and the output optical signal is received by the optical spectrum analyzer 7.
The spectrum received by the spectrum analyzer 7 is as shown in fig. 2, when 918KHz sine wave is input into the signal generator C, enters the piezoelectric ceramic plate B, and is amplified by the aluminum cone A, the laser output obtained by the spectrum analyzer 7 is as shown by the solid line in fig. 2, and LP can be obtained11Outputting the mode Brillouin laser; when the signal generator C is turned off, the spectrum analyzer 7 obtains LP as indicated by the dashed line in FIG. 201Outputting the mode Brillouin laser; when the central wavelength of the tunable narrow linewidth laser light source 1 and the input frequency of the signal generator C are simultaneously changed, the tunability of the output wavelength can be realized, as shown by the square connecting line in fig. 2; when 919KHz sine wave is input into the signal generator C, the central wavelength output by the Brillouin erbium-doped laser is shifted to the right;in fig. 2, the small peak to the left of the output peak is caused by rayleigh scattering.
In this embodiment, the coupling ratio of the optical fiber mode selective coupler 8 is set to 9: 1, and when the output wavelength of the tunable narrow linewidth laser source 1 is fixed and the output power is 10mW, the corresponding curves of the input power of the erbium-doped fiber pump light source 4 and the output power of the brillouin erbium-doped laser are shown in fig. 3. As can be seen from FIG. 3, when the output laser light is LP01In the mode, the threshold value of the Brillouin laser is 150mW, and when the output laser is LP11The threshold at this time is 170mW for mode, and there is a difference in the results obtained when selecting fiber mode selection couplers 8 of different coupling ratios.
When the input frequency of the signal generator C is 0kHz, no signal is input into the acousto-optic device 11, the acousto-optic device 11 cannot realize mode conversion, and the mode output by the brillouin erbium-doped laser from the few-mode input end 82 of the optical fiber mode selection coupler is LP01Mode(s). When the input frequency of the signal generator C is 918kHz, the acousto-optic device 11 will LP01Mode conversion to LP11The mode of the Brillouin erbium-doped laser output from the less-mode input end 82 of the optical fiber mode selection coupler is LP11Mode(s). The mode observed by the Brillouin erbium-doped laser at the fiber mode-selective coupler multimode input 82 will also be at LP when the signal generator C input frequency is switched back and forth between 0kHz and 918kHz01Mode and LP11The mode switches back and forth as shown in fig. 4.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (10)

1. An all-fiber high-order mode Brillouin erbium-doped laser based on an acousto-optic device is characterized by comprising: the device comprises a tunable narrow-linewidth laser light source (1), a circulator (3), an erbium-doped fiber pump light source (4), a wavelength division multiplexer (5), an erbium-doped fiber (6), a spectrum analyzer (7), a fiber mode selection coupler (8), a few-mode fiber (10) and an acousto-optic device (11);
the tunable narrow linewidth laser light source (1), the circulator (3), the wavelength division multiplexer (5), the erbium-doped fiber (6), the fiber mode selection coupler (8), the few-mode fiber (10) and the acousto-optic device (11) are sequentially connected, and the acousto-optic device (11) is connected with the circulator (3); the erbium-doped optical fiber pump light source (4) is connected with the wavelength division multiplexer (5), and the spectrum analyzer (7) is connected with the optical fiber mode selection coupler (8).
2. The all-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device of claim 1, wherein the circulator (3) is provided with three ports, namely a circulator first port (31), a circulator second port (32) and a circulator third port (33); the first port (31) of the circulator is connected with the tunable narrow linewidth laser light source (1), the second port (32) of the circulator is connected with the wavelength division multiplexer (5), and the third port (33) of the circulator is connected with the acousto-optic device (11).
3. The all-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device of claim 1, wherein the wavelength division multiplexer (5) is provided with three ports, which are a wavelength division multiplexer reflection port (51), a wavelength division multiplexer pass band port (52), and a wavelength division multiplexer common port (53); the wavelength division multiplexer reflection port (51) is connected with the circulator (3), the wavelength division multiplexer pass band port (52) is connected with the erbium-doped optical fiber pump light source (4), and the wavelength division multiplexer common port (53) is connected with the erbium-doped optical fiber (6).
4. The all-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device of claim 1, wherein the fiber mode selective coupler (8) has three ports, namely a single-mode input end (81) of the fiber mode selective coupler, a few-mode input end (82) of the fiber mode selective coupler, and a few-mode output end (83) of the fiber mode selective coupler; the single-mode input end (81) of the optical fiber mode selection coupler is connected with the erbium-doped optical fiber (6); the few-mode input end (82) of the optical fiber mode selection coupler is the output end of the Brillouin erbium-doped laser and is connected with the optical spectrum analyzer (7); and the few-mode output end (83) of the optical fiber mode selection coupler is connected with the few-mode optical fiber (10).
5. The all-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device of claim 1, wherein the Brillouin erbium-doped laser further comprises two polarization controllers, namely a first polarization controller (2) and a second polarization controller (9), the first polarization controller (2) is disposed between the tunable narrow-linewidth laser light source (1) and the circulator (3), and the second polarization controller (9) is disposed between the fiber mode selective coupler (8) and the few-mode fiber (10).
6. The all-fiber high-order mode Brillouin erbium-doped laser based on an acousto-optic device according to claim 1, wherein the acousto-optic device (11) comprises an aluminum cone (A), a piezoelectric ceramic plate (B), a signal generator (C) and a voltage amplifier (D) which are connected in sequence; the signal generator (C) is used for generating radio frequency signals, the voltage amplifier (D) is used for amplifying the radio frequency signals and loading the radio frequency signals to the piezoelectric ceramic piece (B), the piezoelectric ceramic piece (B) drives the aluminum cone (A) to vibrate to cause an acousto-optic grating effect, and the optical signals are completed by an LP01Mode to LP11And (4) switching modes.
7. The all-fiber high-order mode Brillouin erbium-doped laser based on an acousto-optic device as claimed in claim 1, wherein the fiber mode selection coupler (8) is formed by coupling a single-mode fiber and a few-mode fiber according to a preset core mode.
8. The all-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device of claim 1, wherein the tunable narrow linewidth laser light source (1) is a semiconductor laser or a fiber laser; the tuning wavelength of the tunable narrow linewidth laser light source (1) is in a C wave band.
9. The all-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device of claim 6, wherein the output wavelength of the Brillouin erbium-doped laser is adjusted by synchronously changing the center wavelength of mode conversion of the tunable narrow linewidth laser light source (1) and the acousto-optic device (11); wherein the center wavelength of the mode conversion of the acousto-optic device (11) is adjusted by changing the input frequency of the signal generator (C).
10. The all-fiber high-order mode brillouin erbium-doped laser based on acousto-optic device of claim 1, characterized in that the center wavelength of mode conversion of the acousto-optic device (11) coincides with the center wavelength of the tunable narrow-linewidth laser light source (1).
CN202011008816.0A 2020-09-23 2020-09-23 All-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device Pending CN112117629A (en)

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CN112781840A (en) * 2021-01-05 2021-05-11 电子科技大学 Method for measuring absorption coefficient of few-mode erbium-doped fiber
CN114069377A (en) * 2021-11-17 2022-02-18 上海大学 Mode control system based on acousto-optic device
CN114447754A (en) * 2022-01-28 2022-05-06 上海大学 Femtosecond visible vortex light laser based on optical fiber internal transverse mode modulation

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CN108418086A (en) * 2018-04-18 2018-08-17 华南理工大学 A kind of all -fiber high-order mode Brillouin optical fiber laser
CN110429988A (en) * 2019-09-19 2019-11-08 上海大学 It is a kind of based on fiber mode conversion all -fiber outside difference detector part

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CN110429988A (en) * 2019-09-19 2019-11-08 上海大学 It is a kind of based on fiber mode conversion all -fiber outside difference detector part

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112781840A (en) * 2021-01-05 2021-05-11 电子科技大学 Method for measuring absorption coefficient of few-mode erbium-doped fiber
CN112781840B (en) * 2021-01-05 2021-10-22 电子科技大学 Method for measuring absorption coefficient of few-mode erbium-doped fiber
CN114069377A (en) * 2021-11-17 2022-02-18 上海大学 Mode control system based on acousto-optic device
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CN114447754B (en) * 2022-01-28 2023-10-31 上海大学 Femtosecond visible vortex light laser based on optical fiber internal transverse mode modulation

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