CN208723306U - A kind of all -fiber high-order mode Brillouin optical fiber laser - Google Patents
A kind of all -fiber high-order mode Brillouin optical fiber laser Download PDFInfo
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- CN208723306U CN208723306U CN201820551972.3U CN201820551972U CN208723306U CN 208723306 U CN208723306 U CN 208723306U CN 201820551972 U CN201820551972 U CN 201820551972U CN 208723306 U CN208723306 U CN 208723306U
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Abstract
The utility model discloses a kind of all -fiber high-order mode Brillouin optical fiber lasers, coupler is selected with ring cavity structure, including narrow linewidth pump laser, image intensifer, the first Polarization Controller, optical fiber circulator, the first fiber mode selection coupler, the second Polarization Controller, single mode optical fiber, less fundamental mode optical fibre and the second fiber mode；Wherein the first fiber mode selects coupler and the second fiber mode to select coupler for intracavity modal switching device, the M8003 line coupling of specific high-order mode in fundamental transverse mode and less fundamental mode optical fibre in single mode optical fiber may be implemented, Brillouin's non-linear gain based on less fundamental mode optical fibre in annular chamber, realize that higher order mode amplifies in intracavitary resonance, directly output higher order mode laser.The high-order mode laser stability of the utility model output is good, and mode purity is high, compact-sized using all optical fibre structure, at low cost, easily integrated with fibre system, improves the practicability and reliability of high-order mode laser.
Description
Technical field
The utility model relates to optical fiber laser, optical communication field, in particular to a kind of all -fiber high-order mode Brillouin light
Fibre laser.
Background technique
High-order mode laser is with a wide range of applications, and draw due to its unique spatial-intensity, phase and polarisation distribution
The more and more interest of people are played.For example, information is modulated in several different high-order modes in optical communication field, that is,
Mode divides multiplexing technology, can significantly improve the transmission capacity in optic communication.In sensory field of optic fibre, high-order mode be can achieve more
High temperature and strain resolving accuracy.In addition, the vortex laser from high-order mode variation, in quantum and nanocomposite optical, optics
Manipulation, super-resolution imaging and laser material processing etc. have very big potentiality.
Under the promotion of these applications, researchers propose many methods to generate high-order mode laser.Currently, generating high
The laser of rank mould laser can be roughly divided into two types: volume elements part solid state laser and full-optical-fiber laser.Compared with the former, entirely
Optical fiber laser has many advantages, such as that at low cost, flexibility is good, stability is good, small in size, high-efficient.Realize full-optical-fiber laser
Critical component is efficient all -fiber mode conversion or selector, including dislocation coupling technique, less fundamental mode optical fibre Prague light
Grid, long-period fiber grating and model selection coupler.The cloth of the conversion of these modes or selector in full-optical-fiber laser
Office can be divided into two classes.The first kind, which is placed on the outside of resonant cavity, and grade is associated in the output of fundamental transverse mode (LP01) laser
In light path.Second class, it is intracavitary which is placed on the laser resonance comprising single mode gain media.But strictly speaking, this two
Class laser is still the amplification of fundamental transverse mode resonance, rather than desired high-order mode resonance amplifies.In addition, because of the endless of device
Kind, both layouts also result in light beam power and quality degradation, and output high-order mode mode purity is low.Therefore, it realizes a kind of high
The method of efficiency, all -fiber and low cost has weight to obtain high-purity, high stability and compact-sized high-order mode laser
The meaning wanted.
Utility model content
The shortcomings that the purpose of the utility model is to overcome the prior arts and insufficient is provided in a kind of all -fiber high-order mode cloth
It is humorous to realize intracavitary high-order mode using passive less fundamental mode optical fibre as gain media based on Brillouin's nonlinear effect for deep optical fiber laser
Vibration amplification, directly obtains the high-order mode laser of height mode purity in laser output.In addition, the laser also has structure tight
It gathers, adjust the advantages of aspects such as easy, cheap, stability is high.
The purpose of this utility model is realized by the following technical solution: a kind of all -fiber high-order mode Brillouin fiber optic laser
Device, comprising: narrow linewidth pump laser, image intensifer, the first Polarization Controller, optical fiber circulator, the selection of the first fiber mode
Coupler, the second Polarization Controller, single mode optical fiber, less fundamental mode optical fibre and the second fiber mode select coupler；
Wherein, the optical fiber circulator is the three fiber ports annular equipped with first port, second port and third port
Device, the narrow linewidth pump laser are connected to image intensifer by single mode optical fiber, and the image intensifer passes through single mode optical fiber
It is connected to the first port of optical fiber circulator, the second port of the optical fiber circulator connects the first optical fiber mode by single mode optical fiber
Formula selects the first port of coupler, and the third port of the optical fiber circulator connects the choosing of the second fiber mode by single mode optical fiber
The first port of coupler is selected, the second port of the first fiber mode selection coupler is connected to second by less fundamental mode optical fibre
Fiber mode selects the second port of coupler, constitutes ring cavity structure；First Polarization Controller is added in image intensifer company
On the single mode optical fiber for connecing the first port of optical fiber circulator, second Polarization Controller is added in the selection coupling of the first fiber mode
The second port of device connects on the less fundamental mode optical fibre of the second port of the second fiber mode selection coupler；First fiber mode
The third port of coupler is selected to export laser.
Preferably, the narrow linewidth pump laser, the narrow linewidth semiconductor that C-band power adjustable can be selected humorous swash
Light device or narrow cable and wide optical fiber laser, line width are lower than 1MHz.
Preferably, the image intensifer can select high-gain erbium-doped fiber amplifier or 1550nm wave band semiconductor
Image intensifer.
Preferably, the optical fiber circulator, the tail optical fiber of three ports are common communications single mode optical fiber, each port single-mode optics
Fine length range is 0.1m to 1m.
Preferably, the less fundamental mode optical fibre is 1550nm wave band less fundamental mode optical fibre, and the pattern count of support is greater than 2 modes, long
Degree is greater than 20m.
Preferably, first fiber mode selection coupler and the second fiber mode select coupler, are single mode
2 × 2 coupler, may be implemented the fundamental transverse mode and less fundamental mode optical fibre in single mode optical fiber made from optical fiber and less fundamental mode optical fibre fused biconical taper
In M8003 line coupling between specific higher order mode, first and the 4th port be single mode optical fiber, second and third port are few mould
Optical fiber.
The optical fiber laser of the utility model is ring cavity structure, includes an optical fiber circulator and two light in annular chamber
Fine model selection coupler and the single mode optical fiber and less fundamental mode optical fibre of connection, wherein two fiber modes of connection select coupler
Less fundamental mode optical fibre account for entire annular chamber long 99% or more.First fiber mode selects coupler and the selection coupling of the second fiber mode
Device is intracavity modal switching device, and the M8003 line of specific high-order mode in fundamental transverse mode and less fundamental mode optical fibre in single mode optical fiber may be implemented
Coupling realizes that higher order mode amplifies in intracavitary resonance based on the excited Brillouin non-linear gain of less fundamental mode optical fibre in annular chamber,
The high-order mode Brillouin laser for stablizing high-purity is generated at room temperature.
The utility model compared with prior art, is had the following advantages and beneficial effects:
1, the utility model selects coupler as laser resonator intracavity modal switching device, loss using fiber mode
It is small, it is high-efficient.
2, the utility model is based on Brillouin's non-linear gain, realizes the intracavitary resonance amplification of higher order mode, the high-order of acquisition
Mould zlasing mode purity is high.
3, for the utility model using the passive less fundamental mode optical fibre of general commercial as gain media, it is convenient to obtain, easy to spread
It uses.
4, the utility model uses all optical fibre structure, simple and compact for structure, at low cost, adjusts simplicity, is easy to fibre system
Integrated, output laser stability is good, and line width improves the practicability and reliability of high-order mode laser.
Detailed description of the invention
Fig. 1 is the schematic diagram of embodiment all -fiber high-order mode Brillouin optical fiber laser.
Fig. 2 is laser power curve graph.
Fig. 3 is pumping laser and output Brillouin's Stokes laser light spectrogram.
In Fig. 1: 1- narrow linewidth pump laser；2- image intensifer；The first Polarization Controller of 3-；4- optical fiber circulator；5-
First fiber mode selects coupler；The second Polarization Controller of 6-；7- less fundamental mode optical fibre；The second fiber mode of 8- selects coupler.
Specific embodiment
The present invention will be further described in detail with reference to the embodiments and the accompanying drawings, but the implementation of the utility model
Mode is without being limited thereto.
Embodiment 1
As shown in Figure 1, a kind of all -fiber high-order mode Brillouin optical fiber laser of this example, comprising: narrow linewidth pumping swashs
Light device 1, image intensifer 2, the first Polarization Controller 3, optical fiber circulator 4, the first fiber mode selection coupler 5, second polarize
Controller 6, less fundamental mode optical fibre 7 and the second fiber mode select coupler 8.
The laser that narrow linewidth pump laser 1 exports carries out power amplification, amplified high power pump light by amplifier 2
The first port 401 of injection fibre circulator 4, then the selection of the first fiber mode is injected from the second port 402 of optical fiber circulator 4
The first port 501 of coupler 5, after the first fiber mode selects coupler 5, pump light is by single-mode optics in first port 501
Fine fundamental transverse mode is changed into the specific high-order mode of less fundamental mode optical fibre in the second port 502 of the first fiber mode selection coupler 5, produces
Raw high-order mode pump light injects in less fundamental mode optical fibre 7 through the second port 502 of the first fiber mode selection coupler 5.When light is put
When the big amplified pumping light power of device 2 is more than the Brillouin threshold of less fundamental mode optical fibre 7, stimulated Brillouin scattering effect occurs,
Generate Brillouin's stokes light of inverted running.The Brillouin's stokes light generated in less fundamental mode optical fibre 7 is successively through the first light
First port 501, the second port 402 of optical fiber circulator 4, the third port of optical fiber circulator 4 of fine model selection coupler 5
403, the second port of the first port 801 of the second fiber mode selection coupler 8 and the second fiber mode selection coupler 8
802 are again introduced into less fundamental mode optical fibre 7, and oscillation is formed in resonant cavity, that is, generate one and move down in single order cloth than pumping light frequency
Deep stokes light, this rank Brillouin stokes light are exported through the third port 503 of the first fiber mode selection coupler 5.
The first Polarization Controller 3 and the first optical fiber mode between image intensifer 2 and the first port 401 of optical fiber circulator 4
Formula selects the second polarization between the second port 502 of coupler 5 and the second port 802 of the second fiber mode selection coupler 8
The polarization state of controller 6 co- controlling pump light and Brillouin's pump light, to obtain maximum Brillouin's non-linear gain.
Narrow linewidth pump laser 1, image intensifer 2, optical fiber circulator 4, the first fiber mode select the first of coupler 5
The tail optical fiber of port 501 and the 4th port 504, the first port 801 of the second fiber mode selection coupler 8 and the 4th port 804
(connection optical fiber) is common communications single mode optical fiber.Due to the first fiber mode selection coupler 5 and the in optical fiber loop
Two fiber modes select coupler 8, and the orientation choosing of specific high-order mode in fundamental transverse mode and less fundamental mode optical fibre 7 in single mode optical fiber may be implemented
Select coupling, thus in less fundamental mode optical fibre 7 specific higher order mode will resonance amplification, thus the first fiber mode select coupler
5 third output end 503 obtains the high-order mode laser of height mode purity.
Narrow linewidth pump laser, the narrow linewidth semiconductor laser that C-band power adjustable can be selected humorous or narrow linewidth
Optical fiber laser, line width are lower than 1MHz.
Image intensifer can select high-gain erbium-doped fiber amplifier or 1550nm wave band semiconductor optical amplifier.
The tail optical fiber of optical fiber circulator, three ports is common communications single mode optical fiber, and each port single-mode optical fiber length range is
0.1m to 1m.
Less fundamental mode optical fibre is 1550nm wave band less fundamental mode optical fibre, and the pattern count of support is greater than 2 modes, and length is greater than 20m.
Embodiment 2
A kind of all -fiber high-order mode Brillouin optical fiber laser, structural schematic diagram are as shown in Figure 1.Narrow linewidth pump laser
1 uses 1550nm wave band narrow-line width single frequency optical fiber laser, line width 10kHz, laser power 30mW.Image intensifer 2 uses
Commercial 1550nm wave band semiconductor optical amplifier, amplifying power is up to 5W.Optical fiber circulator 4 is using commercial three port single mode optical fibers
Circulator.First fiber mode selects coupler 5 and the second fiber mode selection coupler 8 by common communications single mode optical fiber
2 × 2 coupler made from SMF-28e and commercial two mode steps jump optical fiber fused tapering, LP01 mould in single mode optical fiber to two moulds
The transfer efficiency of LP11 mode is 90% in step optical fiber.Single mode optical fiber in optical path is SMF-28e optical fiber.Two in annular chamber
The length of mould step optical fiber is 50m, single-mode optical fiber length 0.4m, therefore two mode steps jump fiber lengths accounting is 99.2%.The
It is 80: 20 that one fiber mode, which selects the first port 501 of coupler 5 and the splitting ratio of third port 503,.
Brillouin's Stokes when amplified pump laser power is gradually increased to 780mW, in optic fiber ring-shaped cavity
Light generates resonance.Pump power continues to increase, and obtains stable laser in the third port of the first fiber mode selection coupler
Output.Fig. 2 is laser power curve graph, and slope efficiency 15.6%, as pump power 3W, laser output power reaches
350mW.Fig. 3 is pumping laser and output Brillouin's Stokes laser light spectrogram, and the Brillouin laser of output is relative to pumping
The frequency displacement of 10.9GHz has occurred in light.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (7)
1. a kind of all -fiber high-order mode Brillouin optical fiber laser characterized by comprising narrow linewidth pump laser, light are put
Big device, the first Polarization Controller, optical fiber circulator, the first fiber mode select coupler, the second Polarization Controller, single-mode optics
Fine, less fundamental mode optical fibre and the second fiber mode select coupler；
Wherein, the optical fiber circulator is the three fiber port circulators equipped with first port, second port and third port, institute
The narrow linewidth pump laser stated is connected to image intensifer by single mode optical fiber, and the image intensifer is connected to by single mode optical fiber
The second port of the first port of optical fiber circulator, the optical fiber circulator connects the selection of the first fiber mode by single mode optical fiber
The third port of the first port of coupler, the optical fiber circulator connects the selection coupling of the second fiber mode by single mode optical fiber
The second port of the first port of device, the first fiber mode selection coupler is connected to the second optical fiber mode by less fundamental mode optical fibre
Formula selects the second port of coupler, constitutes ring cavity structure；First Polarization Controller is added in image intensifer connection optical fiber
On the single mode optical fiber of the first port of circulator, second Polarization Controller is added in the of the first fiber mode selection coupler
Two-port netwerk connects on the less fundamental mode optical fibre of the second port of the second fiber mode selection coupler；First fiber mode selects coupling
The third port of clutch exports laser.
2. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that the narrow linewidth
Pump laser, the narrow linewidth semiconductor laser or narrow cable and wide optical fiber laser for selecting C-band power adjustable humorous, line width are lower than
1MHz。
3. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that the light amplification
Device selects high-gain erbium-doped fiber amplifier or 1550nm wave band semiconductor optical amplifier.
4. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that the fiber optic loop
Shape device, the tail optical fiber of three ports are common communications single mode optical fiber, and each port single-mode optical fiber length range is 0.1m to 1m.
5. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that few mould light
Fibre is 1550nm wave band less fundamental mode optical fibre, and the pattern count of support is greater than 2 modes, and length is greater than 20m.
6. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that first light
Fine model selection coupler and the second fiber mode select coupler, are made from single mode optical fiber and less fundamental mode optical fibre fused biconical taper
The M8003 line coupling in the fundamental transverse mode and less fundamental mode optical fibre in single mode optical fiber between specific higher order mode may be implemented in 2 × 2 coupler
Close, first and the 4th port be single mode optical fiber, second and third port be less fundamental mode optical fibre.
7. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that all -fiber high-order mode
Brillouin optical fiber laser is annular cavity laser, wherein the less fundamental mode optical fibre of two fiber mode selection couplers of connection accounts for entirely
Annular chamber long 99% or more.
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| CN201820551972.3U CN208723306U (en) | 2018-04-18 | 2018-04-18 | A kind of all -fiber high-order mode Brillouin optical fiber laser |
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| CN201820551972.3U CN208723306U (en) | 2018-04-18 | 2018-04-18 | A kind of all -fiber high-order mode Brillouin optical fiber laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108418086B (en) * | 2018-04-18 | 2023-08-22 | 华南理工大学 | All-fiber high-order mode Brillouin fiber laser |
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