CN105305223B - A kind of Brillouin's dynamic raster generation device and method - Google Patents
A kind of Brillouin's dynamic raster generation device and method Download PDFInfo
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- CN105305223B CN105305223B CN201510821264.8A CN201510821264A CN105305223B CN 105305223 B CN105305223 B CN 105305223B CN 201510821264 A CN201510821264 A CN 201510821264A CN 105305223 B CN105305223 B CN 105305223B
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Abstract
The invention belongs to nonlinear fiber optics technical field, a kind of Brillouin's dynamic raster generation device and method are disclosed, for solving the problems, such as to be not easy to tune, ensure system long-term stable operation using the feedback stability technology of complexity is needed existing for electro-optic modulation method using complicated existing for double Light Source Methods.The present invention includes lasing light emitter, microwave source, light polarization modulator, the first Polarization Controller, analyzer, the second Polarization Controller, adjustable differential group delay device, the 3rd Polarization Controller and the first polarization beam apparatus, first fiber amplifier, the first optoisolator, the 4th Polarization Controller and optical fiber, the second fiber amplifier, the second optoisolator, the 5th Polarization Controller, the second polarization beam apparatus, optical circulator and the 6th Polarization Controller, the input of the 6th Polarization Controller have measured signal.
Description
Technical field
The invention belongs to nonlinear fiber optics technical field, discloses a kind of Brillouin's dynamic raster generation device and side
Method.
Background technology
Brillouin's Dynamic Optical Fiber grating (Brillouin Dynamic Grating, BDG) based on stimulated Brillouin scattering
Technology is one of fiber optic communication and the emerging study hotspot of sensory field, compared to traditional fiber grating, have position it is adjustable,
The advantages such as spectrum is adjustable, quick reconfiguration, in distributed fiber-optic sensor, adjustable light wave-filter, photoswitch, fibre delay line, light
Storage medium etc. has important application value.
In order to produce stable BDG, the two beam pump light requirement polarization states transmitted in opposite directions in optical fiber are consistent, and frequency interval
For Brillouin's offset of optical fiber used.Currently, the method for constructing two beam pump lights has two kinds：Double Light Source Methods and Electro-optical Modulation
Method.During using double Light Source Methods, not only require that two light sources are respectively provided with super-narrow line width, and need extra frequency meter to lock two
The difference on the frequency of light source, make stable in Brillouin shift amount in its long-time；Therefore, there is system architecture complexity and be not easy in the program
The shortcomings that tuning.During using electro-optic modulation method, two beam pump lights are both from same light source, and pump light is directly defeated by light source all the way
Go out, another way pump light is produced by single-side belt carrier suppressed modulation.Such as Application No. 201510420967.X patent of invention
Disclose a kind of Brillouin scattering dynamic raster generation device and method based on capillary, including two light paths, a light path
For laser, coupler, amplifier, the first Polarization Controller and the nonlinear optical fiber being sequentially connected, another goes out from coupler
Hair is sequentially connected the second Polarization Controller, modulator, polarization beam combiner and eventually passes back to nonlinear optical fiber, in addition to Synchronization Control
Device, modulator is connected by microwave signal source while isochronous controller is connected with laser；Nonlinear optical fiber is with capillary
For the optical fiber of carrier, capillary inside is filled with refraction inner core.This scheme simplifies system knot due to only using single source
Structure, and do not influenceed by optical source wavelength drift.But the electrooptic modulator for realizing single-side belt carrier suppressed modulation is light orthogonal modulation
Device (I/Q Modulator), it includes two rf inputs mouths and three direct current biasing control ports.To produce high quality
Single-side belt carrier suppressed modulation signal, the microwave signal of two rf inputs mouth injections need to ensure that constant amplitude and phase-shift phase difference are essence
True pi/2, three direct current biasing points need accurate setting in addition, therefore usually require complicated feedback stability technology to ensure to be
The long-term stable operation of system.
The content of the invention
The present invention is in order to solve the problems, such as that prior art is not easy to tune and adopted using complicated existing for double Light Source Methods
The problem of feedback stability technology of complexity is to ensure system long-term stable operation is needed existing for electro-optic modulation method, and provides one
Kind of Brillouin's dynamic raster generation device and method, have it is simple in construction, be easy to tune, and be capable of the spy of long-term stable operation
Point.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of Brillouin's dynamic raster generation device, it is characterised in that including be sequentially connected lasing light emitter, Polarization Modulation
Device, the first Polarization Controller, analyzer, the second Polarization Controller, adjustable differential group delay device, the 3rd Polarization Controller and first
The A ports of polarization beam apparatus, the 3rd Polarization Controller and the first polarization beam apparatus are connected, and the light polarization modulator is also associated with micro-
Wave source, the B ports of first polarization beam apparatus are connected with the first fiber amplifier, the first optoisolator, the 4th polarization in turn
Controller and optical fiber, the C-terminal mouth of first polarization beam apparatus be connected with turn the second fiber amplifier, the second optoisolator,
5th Polarization Controller, the 5th Polarization Controller are connected with the second polarization beam apparatus, and the 5th Polarization Controller and
The B ports connection of two polarization beam apparatus, the input signal of the second polarization beam apparatus B ports are defeated by the second polarization beam apparatus A ports
Go out the optical fiber to be connected with the A ports of the second polarization beam apparatus, the C-terminal mouth of second polarization beam apparatus is connected with the ring of light in turn
Shape device and the 6th Polarization Controller, the 6th Polarization Controller input have measured signal.
A kind of Brillouin's dynamic raster production method, it is characterised in that lasing light emitter output laser injection light polarization modulator, partially
Shake modulator prevention at radio-frequency port connection microwave source output, the Polarization Controller of optical signals first after light polarization modulator is modulated
The polarization state of analyzer is incided in regulation, and the output of analyzer is injected into adjustable after the second Polarization Controller adjusts polarization state
The input of differential group delay device, the output signal of adjustable differential group delay device enter after the 3rd Polarization Controller adjusts polarization state
Be mapped to the A ports of the first polarization beam apparatus, A ports input signal is divided into two-way pump light by the first polarization beam apparatus, respectively by
The B ports of first polarization beam apparatus and the output of C-terminal mouth；
First via pump light is exported by the B ports of the first polarization beam apparatus and injects the first fiber amplifier, through the first light
The first optoisolator is incided after fiber amplifier amplification, the emergent light of the first optoisolator is adjusted by the 4th Polarization Controller to be polarized
Incided after state in optical fiber, the first pump light after transmitting in a fiber enters the A ports of the second polarization beam apparatus；
Second road pump light is exported by the C-terminal mouth of the first polarization beam apparatus and is injected into the second fiber amplifier, through second
The 5th Polarization Controller is incided by the second optoisolator after fiber amplifier amplification, the 5th Polarization Controller adjusts the second tunnel
The polarization state of pump light, the 5th Polarization Controller are connected with the B ports of the second polarization beam apparatus, and via the second polarization beam splitting
The A ports output of device；
Measured signal inputs a ports of optical circulator after the 6th Polarization Controller adjusts polarization state, and by optical circulator
B ports output, the b ports of optical circulator are connected with the C-terminal mouth of the second polarization beam apparatus, from the second polarization beam apparatus C-terminal mouth
A port of the signal of input through the second polarization beam apparatus exports and enters optical fiber, what measured signal was generated when optical fiber transmits
Brillouin's dynamic raster reflects, and reflected signal enters from the A ports of the second polarization beam apparatus, and through the C of the second polarization beam apparatus
Port is emitted, the b ports of the reflected signal injection optical circulator of the C-terminal mouth outgoing of the second polarization beam apparatus, finally by ring of light shape
The c ports output of device.
The polarization direction of the analyzer and the polarization direction of a main shaft of polarization modulator are at 45 °；Pass through regulation the
One Polarization Controller makes the output of analyzer be Double Sideband Suppressed Carrier modulated signal, the energy of Double Sideband Suppressed Carrier modulated signal
Amount concentrates on positive and negative single order sideband, and carrier wave and remaining high-order harmonic wave component suppress.
The polarization state of the Double Sideband Suppressed Carrier modulated signal of the second Polarization Controller regulation input, makes it with relative
Enter in the Orientation of polarized main axis subscript at 45 ° of adjustable differential group delay device, by two polarizations for adjusting adjustable differential group delay device
Main shaft group delay is poor, and the positive and negative single order sideband of the Double Sideband Suppressed Carrier modulated signal of output realizes that polarization state is orthogonal.
Adjusting the 3rd Polarization Controller makes orthogonal positive and negative single order sideband respectively from the B ports of the first polarization beam apparatus and C
Port exports, and realizes the separation of positive and negative single order sideband.
Adjusting the 5th Polarization Controller makes B port of the second road pump light completely by the second polarization beam apparatus, and by
The A ports output of two polarization beam apparatus, the 4th Polarization Controller of regulation make the polarization of first via pump light and the second road pump light
State direction is consistent, it is ensured that produces most strong Brillouin's dynamic raster in a fiber.
First fiber amplifier and the second fiber amplifier are respectively used to adjust first via pump light and No. second pump
The power of Pu light, control two-way pump light in a fiber by electronics direction of wave travel caused by stimulated Brillouin scattering effect,
And then determine measured signal by the wavelength location after the reflection of Brillouin's dynamic raster.
6th Polarization Controller is used to adjust the polarization state of measured signal, when the measured signal is transmitted in a fiber and two-way
The polarization state of pump light is orthogonal.
Optical fiber is single-mode fiber or is polarization maintaining optical fibre.
Microwave source output signal frequency is the half of the Brillouin shift amount of optical fiber used.
The output wavelength of the lasing light emitter can tune.
Compared with prior art, the invention has the advantages that：
Light polarization modulator used in the present invention is only modulated by single channel microwave signal, and need not control direct current biasing point,
Thus compared with I/Q modulators used in single-side belt carrier suppressed modulation scheme, operation difficulty is greatly reduced, and can be in nothing
Long-term stable operation under feedback control；With it is simple in construction, be easy to tune, and can be under the control of feedback-less stabilization technique
The characteristics of long-term stable operation.
The present invention is using the positive and negative single order sideband of double-side band carrier suppressed modulation signal as two-way pump light, microwave source
Output signal frequency is the half of optical fiber Brillouin frequency shift amount used.And pump is being produced based on single-side belt carrier suppressed modulation
In the scheme of Pu light, microwave source output signal frequency is the Brillouin shift amount of optical fiber used, therefore present invention reduces to micro-
The requirement of wave source output frequency, reduce the cost of system.
Brief description of the drawings
Fig. 1 is the structural representation of Brillouin's dynamic raster generation device of the present invention；
Fig. 2 is the positive and negative single order for realizing Double Sideband Suppressed Carrier modulated signal in invention based on adjustable differential group delay device
The orthogonal schematic diagram of sideband polarization state；
Marked in figure：1st, lasing light emitter, 2, microwave source, 3, light polarization modulator, the 4, first Polarization Controller, 5, analyzer, 6,
Second Polarization Controller, 7, adjustable differential group delay device, the 8, the 3rd Polarization Controller, the 9, first polarization beam apparatus, the 10, first light
Fiber amplifier, the 11, first optoisolator, the 12, the 4th Polarization Controller, 13, optical fiber, the 14, second fiber amplifier, 15, second
Optoisolator, the 16, the 5th Polarization Controller, the 17, second polarization beam apparatus, 18, optical circulator, the 19, the 6th Polarization Controller,
20th, measured signal.
Embodiment
With reference to embodiment, the invention will be further described, and described embodiment is only a present invention part
Embodiment, it is not whole embodiments.Based on the embodiment in the present invention, one of ordinary skill in the art is not making
Other embodiments used obtained under the premise of creative work, belong to protection scope of the present invention.
With reference to accompanying drawing, Brillouin's dynamic raster generation device of the invention, including the lasing light emitter 1, the polarization that are sequentially connected are adjusted
Device 3 processed, the first Polarization Controller 4, analyzer 5, the second Polarization Controller 6, adjustable differential group delay device 7, the 3rd Polarization Control
The polarization beam apparatus 9 of device 8 and first, wherein, the 3rd Polarization Controller 8 is connected with the A ports of the first polarization beam apparatus；The polarization
Modulator 3 is also associated with microwave source 2；The B ports of first polarization beam apparatus 9 be connected with turn the first fiber amplifier 10,
First optoisolator 11, the 4th Polarization Controller 12 and optical fiber 13, the C-terminal mouth of first polarization beam apparatus 9 are connected with turn
Second fiber amplifier 14, the second optoisolator 15, the 5th Polarization Controller 16, the 5th Polarization Controller 16 are connected with
Two polarization beam apparatus 17, and the 5th Polarization Controller 16 is connected with the B ports of the second polarization beam apparatus 17, the optical fiber 13 with
The A ports connection of second polarization beam apparatus 17, the C-terminal mouth of the secondth polarization beam apparatus 17 are connected with optical circulator 18 in turn
With the 6th Polarization Controller 19, the 6th Polarization Controller 19 input has measured signal 20.Wherein, the b ends of optical circulator 18
Mouth is connected with the C-terminal mouth of the second polarization beam apparatus 17, and a ports of optical circulator 18 are connected with the 6th Polarization Controller 19.
Brillouin's dynamic raster production method of Brillouin's dynamic raster generation device, it is inclined that lasing light emitter 1 exports laser injection
Shake modulator 3, the output of the prevention at radio-frequency port connection microwave source 2 of light polarization modulator 3, the optical signal after the modulation of light polarization modulator 3
The polarization state of analyzer 5 is incided by the regulation of the first Polarization Controller 4, the output of analyzer 5 is adjusted by the second Polarization Controller 6
The input of adjustable differential group delay device 7 is injected into after section polarization state, the output signal of adjustable differential group delay device 7 is inclined through the 3rd
The A ports of the first polarization beam apparatus 9 are incided after the controller 8 that shakes regulation polarization state, the first polarization beam apparatus 9 inputs A ports
Signal is divided into two-way pump light, is exported respectively by the B ports of the first polarization beam apparatus 9 and C-terminal mouth；
First via pump light is exported by the B ports of the first polarization beam apparatus 9 and injects the first fiber amplifier 10, through first
Fiber amplifier 10 incides the first optoisolator 11 after amplifying, and the emergent light of the first optoisolator 11 is by the 4th Polarization Controller
Incided after 12 regulation polarization states in optical fiber 13, the first pump light after being transmitted in optical fiber 13 enters the second polarization beam apparatus 17
A ports；
Second road pump light is exported by the C-terminal mouth of the first polarization beam apparatus 9 and is injected into the second fiber amplifier 14, through
The 5th Polarization Controller 16, the 5th Polarization Controller 16 are incided by the second optoisolator 15 after the amplification of two fiber amplifiers 14
The polarization state of the second road pump light is adjusted, and is connected with the B ports of the second polarization beam apparatus 17；
Measured signal 20 inputs a ports of optical circulator 18 after the 6th Polarization Controller 19 adjusts polarization state, and by light
The b ports output of circulator 18, the b ports of optical circulator 18 are connected with the C-terminal mouth of the second polarization beam apparatus 17, from the second polarization
A port of the signal through the second polarization beam apparatus 17 of the C-terminal mouth input of beam splitter 17 exports and enters optical fiber 13, measured signal 20
The Brillouin's dynamic raster reflection being generated when optical fiber 13 transmits, reflected signal enter from the A ports of the second polarization beam apparatus 17
Enter, and the outgoing of the C-terminal mouth through the second polarization beam apparatus 17, the reflected signal injection of the C-terminal mouth outgoing of the second polarization beam apparatus 17
The b ports of optical circulator 18, finally exported by the c ports of optical circulator 18.
Light polarization modulator 3 used in the present invention is a kind of special phase-modulator, and it has two polarization principal axis, and
It is anti-phase along the phase modulation index constant amplitude of the two Orientation of polarized main axis.Therefore, along 3 two Orientation of polarized main axis of light polarization modulator
The optical electric field of (being set to x directions and y directions) output is represented by：
Wherein, Ein(t) it is input optical electric field, β is phase modulation coefficient, and ω is to be loaded into light polarization modulator prevention at radio-frequency port
Radiofrequency signal angular frequency.Signal after modulation is entered in analyzer 5 by the first Polarization Controller 4, the polarization side of analyzer 5
To at 45 ° with the polarization direction of 3 one main shafts of light polarization modulator.The effect of first Polarization Control 4 is in ExAnd E (t)x(t) between
Introduce a phase difference.As phase difference=π, the output signal of analyzer 5 is Double Sideband Suppressed Carrier modulated signal, letter
Number energy be concentrated mainly on positive and negative single order sideband, carrier wave and remaining high-order harmonic wave component effectively suppress.
The polarization state of the Double Sideband Suppressed Carrier modulated signal of the regulation of second Polarization Controller 6 input, makes it with phase
Enter for the Orientation of polarized main axis subscript at 45 ° of adjustable differential group delay device 7, it is inclined by adjust adjustable differential group delay device two
Main shaft group delay of shaking is poor, and the positive and negative single order sideband of the Double Sideband Suppressed Carrier modulated signal of output realizes that polarization state is orthogonal.Such as figure
Shown in 2, input signal is divided into constant amplitude two parts, is transmitted respectively along two polarization principal axis of adjustable differential group delay device, due to
Have that group delay is poor between two polarization principal axis, thus the positive and negative sideband of modulated signal by relative to carrier wave to opposite polarization
State direction rotates, and its anglec of rotation expression formula is：
θ=π nfm·τDGD
Here n is the exponent number of light modulation sideband, fmIt is frequency modulating signal, τDGDIt is the polarization principal axis of differential group delay device two
Between group delay it is poor.For single order sideband, work as fm·τDGDWhen=1/4, the positive and negative single order of Double Sideband Suppressed Carrier modulated signal
Sideband realizes that polarization state is orthogonal.
Adjusting the 3rd Polarization Controller 8 makes orthogonal positive and negative single order sideband respectively from the B ports of the first polarization beam apparatus 9
Exported with C-terminal mouth, realize the separation of positive and negative single order sideband.
Adjusting the 5th Polarization Controller 16 makes B port of the second road pump light completely by the second polarization beam apparatus 17, and
Exported by the A ports of the second polarization beam apparatus 17, the 4th Polarization Controller 12 of regulation makes first via pump light and the second tunnel pumping
The polarization state direction of light is consistent, it is ensured that most strong Brillouin's dynamic raster is produced in optical fiber 13.
The fiber amplifier 14 of first fiber amplifier 10 and second is respectively used to adjust first via pump light and second
The power of road pump light, the purpose is to control two-way pump light in optical fiber 13 by electric caused by stimulated Brillouin scattering effect
The wavelet direction of propagation, and then determine measured signal by the wavelength location after the reflection of Brillouin's dynamic raster.
6th Polarization Controller 19 is used for the polarization state for adjusting measured signal 20, measured signal 20 is transmitted in optical fiber 13
When it is orthogonal with the polarization state of two-way pump light.
The optical fiber 13 of the present invention is general single mode fiber or is polarization maintaining optical fibre；The output signal frequency of microwave source 2 is used
The half of the Brillouin shift amount of optical fiber 13；The output wavelength of the lasing light emitter can tune so that Brillouin's dynamic raster
It can be produced at different wave length.
Claims (10)
- A kind of 1. Brillouin's dynamic raster generation device, it is characterised in that including be sequentially connected lasing light emitter, light polarization modulator, First Polarization Controller, analyzer, the second Polarization Controller, adjustable differential group delay device, the 3rd Polarization Controller and first are inclined Shake beam splitter, and the A ports of the 3rd Polarization Controller and the first polarization beam apparatus are connected, and the light polarization modulator is also associated with microwave Source, the B ports of first polarization beam apparatus are connected with the first fiber amplifier, the first optoisolator, the 4th polarization control in turn Device and optical fiber processed, the C-terminal mouth of first polarization beam apparatus are connected with the second fiber amplifier, the second optoisolator, in turn Five Polarization Controllers, the 5th Polarization Controller are connected with the second polarization beam apparatus, and the 5th Polarization Controller and second The B ports connection of polarization beam apparatus, the input signal of the second polarization beam apparatus B ports are exported by the second polarization beam apparatus A ports, The optical fiber is connected with the A ports of the second polarization beam apparatus, and the C-terminal mouth of second polarization beam apparatus is connected with ring of light shape in turn Device and the 6th Polarization Controller, the 6th Polarization Controller input have measured signal.
- 2. Brillouin's dynamic raster production method of Brillouin's dynamic raster generation device according to claim 1, it is special Sign is that lasing light emitter output laser injection light polarization modulator, the prevention at radio-frequency port of light polarization modulator connects the output of microwave source, through inclined The polarization state of analyzer, the output warp of analyzer are incided in the Polarization Controller of optical signals first regulation after modulators modulate of shaking The input of adjustable differential group delay device is injected into after crossing the second Polarization Controller regulation polarization state, adjustable differential group delay device Output signal incides the A ports of the first polarization beam apparatus, the first polarization beam splitting after the 3rd Polarization Controller adjusts polarization state A ports input signal is divided into two-way pump light by device, is exported respectively by the B ports of the first polarization beam apparatus and C-terminal mouth；First via pump light is exported by the B ports of the first polarization beam apparatus and injects the first fiber amplifier, is put through the first optical fiber The first optoisolator is incided after big device amplification, the emergent light of the first optoisolator is by after the 4th Polarization Controller regulation polarization state Incide in optical fiber, the first pump light after transmitting in a fiber enters the A ports of the second polarization beam apparatus；Second road pump light is exported by the C-terminal mouth of the first polarization beam apparatus and is injected into the second fiber amplifier, through the second optical fiber The 5th Polarization Controller is incided by the second optoisolator after amplifier amplification, the 5th Polarization Controller adjusts the second tunnel pumping The polarization state of light, the 5th Polarization Controller are connected with the B ports of the second polarization beam apparatus, and via the second polarization beam apparatus A ports export；Measured signal inputs a ports of optical circulator after the 6th Polarization Controller adjusts polarization state, and by the b ends of optical circulator Mouth output, the b ports of optical circulator are connected with the C-terminal mouth of the second polarization beam apparatus, from the input of the second polarization beam apparatus C-terminal mouth A port of the signal through the second polarization beam apparatus exports and enters optical fiber, the Brillouin that measured signal is generated when optical fiber transmits Dynamic raster reflects, and reflected signal enters from the A ports of the second polarization beam apparatus, and the C-terminal mouth through the second polarization beam apparatus goes out Penetrate, the b ports of the reflected signal injection optical circulator of the C-terminal mouth outgoing of the second polarization beam apparatus, finally by the c ends of optical circulator Mouth output.
- 3. Brillouin's dynamic raster production method according to claim 2, it is characterised in that the polarization side of the analyzer It is at 45 ° to the polarization direction of a main shaft with light polarization modulator；Make the output of analyzer by adjusting the first Polarization Controller For Double Sideband Suppressed Carrier modulated signal, the energy of Double Sideband Suppressed Carrier modulated signal concentrates on positive and negative single order sideband, carrier wave Suppress with remaining high-order harmonic wave component.
- 4. Brillouin's dynamic raster production method according to claim 3, it is characterised in that second Polarization Controller The polarization state of the Double Sideband Suppressed Carrier modulated signal of input is adjusted, makes it with relative to the polarization master of adjustable differential group delay device Direction of principal axis subscript at 45 ° enters, poor by the two polarization principal axis group delays for adjusting adjustable differential group delay device, and the carrier wave of output suppresses The positive and negative single order sideband of double sideband modulation signal realizes that polarization state is orthogonal.
- 5. Brillouin's dynamic raster production method according to claim 4, it is characterised in that the 3rd Polarization Controller of regulation Orthogonal positive and negative single order sideband is exported respectively from the B ports of the first polarization beam apparatus and C-terminal mouth, realize positive and negative single order sideband Separation.
- 6. Brillouin's dynamic raster production method according to claim 5, it is characterised in that the 5th Polarization Controller of regulation Make B port of the second road pump light completely by the second polarization beam apparatus, and exported by the A ports of the second polarization beam apparatus, adjusted Saving the 4th Polarization Controller makes first via pump light consistent with the polarization state direction of the second road pump light, it is ensured that produces in a fiber Most strong Brillouin's dynamic raster.
- 7. Brillouin's dynamic raster production method according to claim 6, it is characterised in that first fiber amplifier It is respectively used to adjust the power of first via pump light and the second road pump light with the second fiber amplifier, control two-way pump light exists By electronics direction of wave travel caused by stimulated Brillouin scattering effect in optical fiber, and then determine measured signal by Brillouin's dynamic Wavelength location after optical grating reflection.
- 8. Brillouin's dynamic raster production method according to claim 7, it is characterised in that the 6th Polarization Controller is used for The polarization state of measured signal is adjusted, makes measured signal orthogonal with the polarization state of two-way pump light when transmitting in a fiber.
- 9. according to any described Brillouin's dynamic raster production methods of claim 2-8, it is characterised in that optical fiber is single-mode optics Fibre is polarization maintaining optical fibre.
- 10. Brillouin's dynamic raster production method according to claim 9, it is characterised in that microwave source output signal frequency Rate is the half of the Brillouin shift amount of optical fiber used；The output wavelength of the lasing light emitter can tune.
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| CN105932537B (en) * | 2016-04-22 | 2018-09-11 | 哈尔滨理工大学 | A method of realizing that light-wave retardation amount is flexibly controllable |
| CN109449745B (en) * | 2018-11-02 | 2019-11-22 | 太原理工大学 | The generation device and method of random Brillouin's dynamic raster |
| CN109713562B (en) * | 2019-01-24 | 2020-03-31 | 太原理工大学 | Random fiber laser based on random Brillouin dynamic grating |
| CN110445009B (en) * | 2019-07-29 | 2022-04-12 | 北京邮电大学 | Optical fiber Brillouin amplifier based on orthogonal double pumping |
| CN111561996B (en) * | 2020-04-24 | 2022-08-16 | 太原理工大学 | Chaotic Brillouin dynamic grating all-optical trigger device and implementation method |
| CN111637909B (en) * | 2020-05-19 | 2021-10-08 | 太原理工大学 | Polarization orthogonal double-pump pulse BOTDA sensing device and method |
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