CN109742643A - High power narrow linewidth Raman Fiber Amplifier - Google Patents
High power narrow linewidth Raman Fiber Amplifier Download PDFInfo
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- CN109742643A CN109742643A CN201910148590.5A CN201910148590A CN109742643A CN 109742643 A CN109742643 A CN 109742643A CN 201910148590 A CN201910148590 A CN 201910148590A CN 109742643 A CN109742643 A CN 109742643A
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- raman
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Abstract
A kind of high power narrow linewidth Raman Fiber Amplifier, it is made of pumping source, wavelength division multiplexer, Raman gain optical fiber, the pumping source is the pumping source of high frequency modulated, modulating frequency is greater than 10MHz, the pumping laser of the high frequency modulated of the pumping source transmitting is coupled into the Raman gain optical fiber by the wavelength division multiplexer, the signal light of backpropagation in the Raman gain optical fiber, under the pumping of the pumping laser of the high frequency modulated after excited Raman amplification, exported through the wavelength division multiplexer.The present invention does not need extraordinary Raman gain optical fiber, does not need to do specially treated to Raman gain optical fiber yet, and the spectrum of Brillouin signal is innovatively broadened by nonlinear optical effect, achievees the effect that reduce brillouin gain, inhibits stimulated Brillouin scattering.This method implementation is simple, Brillouin scattering inhibitory effect is good, can be superimposed use with other methods, to obtain high-power narrow linewidth Raman Fiber Amplifier output.
Description
Technical field
The present invention relates to fiber amplifier, especially a kind of high power narrow linewidth Raman Fiber Amplifier.
Background technique
Optical fiber laser have many advantages, such as compact-sized, high-efficient, good beam quality, stablize it is easy-to-use, industry, national defence,
It is used widely in the fields such as medical treatment, basic research.Raman fiber lasers are a kind of special optical fiber lasers, it utilizes light
Stimulated Raman scattering in fibre is as gain, and maximum characteristic and advantage is that the wave-length coverage of transmitting laser is wide, as long as having properly
The pumping laser of wavelength can generate laser by any wavelength within the scope of fiber transparent.In addition, in numerous high-end applications, not only
There is particular/special requirement to the wavelength of optical fiber laser, also have very high requirement to its spectral width, often requires that MHz is even narrower
Line width.Therefore, narrow linewidth Raman fiber lasers and amplifier application prospect are extensive, especially high-power narrow linewidth Raman light
Fiber amplifier is always the hot spot of scientific research and industry development.But when amplifying narrow-linewidth laser in a fiber, it will receive optical fiber
In-limitation of stimulated Brillouin scattering, power ascension is difficult.In narrow linewidth Raman fiber lasers, excited Brillouin dissipates
It is the most serious to penetrate bring limitation.Because Raman gain is small, the gain fibre of tens of rice or even hundreds of meters is generally required, cloth is excited
In deep pool scattering strongly.Currently, inhibiting stimulated Brillouin scattering, the side of narrow linewidth Raman Fiber Amplifier output power is improved
Method mainly has following a few classes:
One, reduce gain fibre length, increase optical fiber mode fields area.Stimulated Brillouin scattering is a kind of nonlinear optics mistake
Journey, small-signal gain is with fiber lengths, power density exponential increase.Therefore, reduce gain fibre length, using large mode field light
It is the natural technological means of comparison that fibre, which reduces power density, and output power can be improved.(referring to document: Yan Feng, Luke
Taylor,and Domenico Bonaccini Calia,“Multiwatts narrow linewidth fiber Raman
Amplifiers, " Opt.Express 16,10927-10932 (2008)) still, since stimulated Raman scattering is equally a kind of
Nonlinear optical process reduces gain fibre length, can equally reduce Raman gain using large mode field optical fiber.So using this
Means can not improve the efficiency of amplifier although the output power of narrow linewidth raman amplifier can be improved, and swash to pumping
The output power of light device and the antibody Monoclonal of optical fibre device propose very high requirement.
Two, using the special optical fiber of the low stimulated Brillouin scattering of special designing.Stimulated Brillouin scattering be light wave fields and
Sound wave field interactions as a result, therefore can by change fibre core in doping component or dopant profiles so that fiber core
The decline of the degree of overlapping of middle light wave fields and acoustic wavefield, reduces the brillouin gain coefficient of optical fiber.It has been reported, in single-frequency Raman amplifiction
In device, using the Raman gain optical fiber of special designing, stimulated Brillouin scattering inhibited (referring to document: C.Vergien,
I.Dajani,and C.Robin,"18W single-stage single-frequency acoustically tailored
Raman fiber amplifier, " Optics Letters 37,1766-1768 (2012)), still, up to the present, adopt
The stimulated Brillouin scattering inhibitory effect obtained in this way is limited, and since it is desired that special designing optical fiber, enforcement difficulty
It is very big.
Three, effective brillouin gain spectrum is broadened.The central wavelength position of brillouin gain spectrum and the material of optical fiber, structure are joined
Number, environment temperature, fiber stress etc. have relationship.Pass through the optical fiber of Parameters variation on design length direction (such as cone of light
It is fine), apply different the methods of temperature and stress in fiber length, may be implemented brillouin gain spectrum along length side
To change, broaden effective bandwidth.But the Brillouin light signal generated in different spatial, it cannot be in other position
Effectively amplified, to reduce total brillouin gain.Currently, stress method achieves optimal effect, pass through optimizing stress
Gradient distribution, realizing 20 times of effective g-factor reduces, 52% light phototransformation efficiency (referring to document: Lei Zhang,
Jinmen Hu,Jianhua Wang,and Yan Feng,“Stimulated-Brillouin-scattering-
suppressed high power single frequency polarization maintaining Raman fiber
amplifier with longitudinally varied strain for laser guide star,”
Opt.Lett.37,4796-4798(2012).).The problem for having enforcement difficulty big but these methods remain unchanged.
Summary of the invention
The present invention proposes that a kind of high power narrow linewidth Raman Fiber Amplifier, the fiber amplifier do not need extraordinary Raman
Gain fibre does not need to do specially treated to Raman gain optical fiber yet, innovatively broadens Brillouin by nonlinear optical effect
The spectrum of signal achievees the effect that reduce brillouin gain, inhibits stimulated Brillouin scattering.The high power narrow linewidth Raman fiber
Amplifier is simple with implementation, Brillouin scattering inhibitory effect is good, can be superimposed use with other suppressing methods, to obtain Gao Gong
The narrow linewidth Raman Fiber Amplifier of rate exports.
Technical solution of the invention is as follows:
A kind of high power narrow linewidth Raman Fiber Amplifier is made of pumping source, wavelength division multiplexer, Raman gain optical fiber,
It is characterized in that the pumping source is the pumping source of high frequency modulated, modulating frequency is greater than 10MHz, the pumping source transmitting
The pumping laser of high frequency modulated the Raman gain optical fiber is coupled by the wavelength division multiplexer, in the Raman
The signal light of backpropagation in gain fibre, under the pumping of the pumping laser of the high frequency modulated after excited Raman amplification,
It is exported through the wavelength division multiplexer.
The pumping source is optical fiber laser, solid state laser or semiconductor laser；The pumping source is that Q is adjusted to swash
Light device, mode-locked laser or master oscillator power amplifier.
The optical fiber laser is ytterbium-doping optical fiber laser/amplifier, erbium doped fiber laser/amplifier, mixes thulium light
Fibre laser/amplifier mixes holmium fiber laser/amplifier or Raman fiber lasers/amplifier.
The Raman gain optical fiber is silica fibre, phosphate optical fiber, silicate fibers, tellurate optical fiber or fluoride
Optical fiber.
The Raman gain optical fiber is single mode optical fiber or multimode fibre.
Technical effect of the invention:
In the narrow linewidth Raman Fiber Amplifier of backward pump, Raman signal light is opposite with pumping optical propagation direction；By
The Brillouin light that the excitation of narrow linewidth Raman signal light generates, with Raman signal optical propagation direction on the contrary, with pumping optical propagation direction
It is identical.Therefore, the pump light of high frequency modulated can pass through another nonlinear optical process in optical fiber --- cross-phase tune
System-broadening Brillouin light spectrum.Assuming that pumping source is with the laser of frequency f periodic modulation, then at Brillouin light center
The both sides of wavelength, can be because be divided into the sideband of f between Cross-phase Modulation generation.Sideband size, quantity etc. and pump light are specific
It is related to modulate form.And between pump light and Raman signal light, because the direction of propagation is on the contrary, without Cross-phase Modulation process, because
The spectral width of this Raman signal light is not influenced by pump light.The Brillouin light being broadened, if spectral width and Brillouin increase
When beneficial bandwidth can compare or is wider, being excited amplification process and will being weakened severely for Brillouin light is excited to reach inhibition
The effect of Brillouin scattering.
For the Raman signal light of backpropagation, due to going away bring average effect, raman amplifier has low frequency filtering
Effect, it is insensitive to the high frequency time domain specification of pumping laser.Therefore, although using the pumping source of high frequency modulated, still may be used
To obtain the raman laser of continuous wave amplification.
Compared with prior art, the present invention having the advantage that
One, the present invention broadens the spectrum of Brillouin light by using the pump light of high frequency modulated, to inhibit to be excited in cloth
Deep pool scattering, exploitativeness is high compared with prior art.The laser light source technology maturation of megahertz repetition modulation, can be by kinds of schemes reality
It is existing；Parameter regulation is flexible, is more convenient for optimizing stimulated Brillouin scattering inhibitory effect.
Two, the present invention is matched with the prior art, can be superimposed the stimulated Brillouin scattering inhibitory effect bigger using acquirement,
To further increase the output power of narrow linewidth Raman Fiber Amplifier.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of high power narrow linewidth Raman Fiber Amplifier of the present invention.
Fig. 2 is the structural schematic diagram of the embodiment 1 of high frequency modulated pumping source used in the present invention.
Fig. 3 is the structural schematic diagram of the embodiment 2 of high frequency modulated pumping source used in the present invention.
Specific embodiment
Below in conjunction with drawings and examples, the present invention is further illustrated, but protection of the invention should not be limited with this
Range.
Please refer to Fig. 1.Fig. 1 is the structural schematic diagram of high power narrow linewidth Raman Fiber Amplifier of the present invention.As seen from the figure,
High power narrow linewidth Raman Fiber Amplifier of the present invention is made of pumping source 1, wavelength division multiplexer 2, Raman gain optical fiber 3, described
Pumping source 1 be high frequency modulated pumping source, modulating frequency is greater than 10MHz, the pump for the high frequency modulated that the pumping source 1 emits
Pu laser is coupled into the Raman gain optical fiber 3 by the wavelength division multiplexer 2, in the Raman gain optical fiber 3
The signal light of backpropagation, under the pumping of the pumping laser of the high frequency modulated after excited Raman amplification, through the wave
Division multiplexer 2 exports.
The pumping source 1 is optical fiber laser, solid state laser or semiconductor laser；The pumping source 1 is to adjust Q
Laser, mode-locked laser or master oscillator power amplifier.
The optical fiber laser is ytterbium-doping optical fiber laser/amplifier, erbium doped fiber laser/amplifier, mixes thulium light
Fibre laser/amplifier mixes holmium fiber laser/amplifier or Raman fiber lasers/amplifier.
The Raman gain optical fiber 3 is silica fibre, phosphate optical fiber, silicate fibers, tellurate optical fiber or fluorination
Object light is fine.
The Raman gain optical fiber 3 is single mode optical fiber or multimode fibre.
Please refer to Fig. 2 and Fig. 3.The pumping source 1 of the high frequency modulated can be obtained by different modes.Fig. 2 is a kind of implementation
The structural schematic diagram of mode.The output of continuous wave seed laser 11 becomes high frequency modulated by an intensity modulator 12
Laser, using 13 hoisting power of power amplifier, the pumping source as high power narrow linewidth Raman Fiber Amplifier of the present invention
1.Fig. 3 is the structural schematic diagram of another embodiment.Laser driver 14 modulates laser diode seed source 15, generates high frequency
The laser of modulation, using 16 hoisting power of power amplifier, as high power narrow linewidth Raman Fiber Amplifier of the present invention
Pumping source 1.
Two specific implementation examples are given below:
Embodiment 1,1178nm narrow linewidth Raman Fiber Amplifier
Continuous wave seed laser 11 uses 1070nm and 1120nm dual-wavelength optical-fiber laser, by an acousto-optic intensity tune
Device 12 processed, copped wave become the laser of high frequency modulated (repetition is greater than 10MHz), mix ytterbium-Raman hybrid fiber power using one
Amplifier 13 obtains high-power 1120nm laser pumping source 1.1120nm pumping source 1 passes through a 1120nm/1178nm points
The wavelength division multiplexer 2 of light is coupled into single mode quartz Raman gain optical fiber 3.The 1178nm of backpropagation in Raman gain optical fiber 3
Light, excited Raman amplifies under 1120nm laser pump (ing), is exported by the wavelength division multiplexer 2 of 1120nm/1178nm light splitting.
Embodiment 2,1650nm narrow linewidth Raman Fiber Amplifier
Diode seed source 15 uses 1550nm single mode laser diode, under the driving of laser driver 14, generates high
The laser of (repetition is greater than 10MHz) obtains high-power using an Er-doped fiber power amplifier 16 under frequency modulation system
1550nm laser pumping source 1.1550nm pumping source 1, the wavelength division multiplexer 2 being divided by a 1550nm/1650nm, is coupled into
Single mode quartz Raman gain optical fiber 3.The 1650nm light of the backpropagation in Raman gain optical fiber 3, under 1550nm laser pump (ing)
Excited Raman amplification is exported by the wavelength division multiplexer 2 of 1550nm/1650nm light splitting.
Experiment shows that the present invention does not need extraordinary Raman gain optical fiber, and it is special also not need to do Raman gain optical fiber
Processing innovatively broadens the spectrum of Brillouin signal by nonlinear optical effect, and reaching reduces brillouin gain, inhibits to be excited
The effect of Brillouin scattering.The high power narrow linewidth Raman Fiber Amplifier, which has, implements simple, Brillouin scattering inhibitory effect
Well, use can be superimposed with other suppressing methods, to obtain high-power narrow linewidth Raman Fiber Amplifier output.
Claims (5)
1. a kind of high power narrow linewidth Raman Fiber Amplifier, including pumping source (1), wavelength division multiplexer (2) and Raman gain light
Fine (3), which is characterized in that the pumping source (1) is the pumping source of high frequency modulated, and modulating frequency is greater than 10MHz, the pump
The pumping laser of the high frequency modulated of Pu source (1) transmitting is coupled into the Raman gain light by the wavelength division multiplexer (2)
Fine (3), the signal light of backpropagation in the Raman gain optical fiber (3), in the pumping laser of the high frequency modulated
After pumping lower excited Raman amplification, exported through the wavelength division multiplexer (2).
2. high power narrow linewidth Raman Fiber Amplifier according to claim 1, it is characterised in that the pumping source (1)
For optical fiber laser, solid state laser or semiconductor laser；The pumping source (1) be Q-switched laser, mode-locked laser or
Master oscillator power amplifier.
3. high power narrow linewidth Raman Fiber Amplifier according to claim 2, it is characterised in that the optical-fiber laser
Device is ytterbium-doping optical fiber laser/amplifier, erbium doped fiber laser/amplifier, thulium-doped fiber laser/amplifier, mixes holmium light
Fibre laser/amplifier or Raman fiber lasers/amplifier.
4. high power narrow linewidth Raman Fiber Amplifier according to claim 1, it is characterised in that the Raman gain
Optical fiber (3) is silica fibre, phosphate optical fiber, silicate fibers, tellurate optical fiber or fluoride fiber.
5. high power narrow linewidth Raman Fiber Amplifier according to claim 1 or 4, it is characterised in that the Raman increases
Beneficial optical fiber (3) is single mode optical fiber or multimode fibre.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910148590.5A CN109742643A (en) | 2019-02-28 | 2019-02-28 | High power narrow linewidth Raman Fiber Amplifier |
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| CN201910148590.5A CN109742643A (en) | 2019-02-28 | 2019-02-28 | High power narrow linewidth Raman Fiber Amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541138A (en) * | 2020-04-17 | 2020-08-14 | 华南理工大学 | Device for inhibiting stimulated Brillouin scattering in high-power narrow-linewidth optical fiber laser |
| CN117498142A (en) * | 2023-11-02 | 2024-02-02 | 上海频准激光科技有限公司 | Optical signal amplifying device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1525226A (en) * | 2003-09-16 | 2004-09-01 | 浙江大学 | Low noise, high gain and zero dispersion Lamann amplifier |
| US20090237779A1 (en) * | 2008-03-18 | 2009-09-24 | Fujitsu Limited | Optical amplifier |
| CN102931574A (en) * | 2012-11-09 | 2013-02-13 | 中国人民解放军国防科学技术大学 | Single-frequency nanosecond pulse fiber raman amplifier |
| CN111541138A (en) * | 2020-04-17 | 2020-08-14 | 华南理工大学 | Device for inhibiting stimulated Brillouin scattering in high-power narrow-linewidth optical fiber laser |
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2019
- 2019-02-28 CN CN201910148590.5A patent/CN109742643A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1525226A (en) * | 2003-09-16 | 2004-09-01 | 浙江大学 | Low noise, high gain and zero dispersion Lamann amplifier |
| US20090237779A1 (en) * | 2008-03-18 | 2009-09-24 | Fujitsu Limited | Optical amplifier |
| CN102931574A (en) * | 2012-11-09 | 2013-02-13 | 中国人民解放军国防科学技术大学 | Single-frequency nanosecond pulse fiber raman amplifier |
| CN111541138A (en) * | 2020-04-17 | 2020-08-14 | 华南理工大学 | Device for inhibiting stimulated Brillouin scattering in high-power narrow-linewidth optical fiber laser |
Non-Patent Citations (2)
| Title |
|---|
| G. RAVET: "Suppression of Stimulated Brillouin scattering with a Raman Fiber Amplifier", 《PROCEEDINGS SYMPOSIUM IEEE/LEOS BENELUX CHAPTER CONFERENCE》 * |
| HARISH ACHAR VASANT: "Advanced modulation schemes for suppression of stimulated Brillouin scattering in optical fibre amplifiers", 《PHD THESIS .UNIVERSITY OF SOUTHAMPTON》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541138A (en) * | 2020-04-17 | 2020-08-14 | 华南理工大学 | Device for inhibiting stimulated Brillouin scattering in high-power narrow-linewidth optical fiber laser |
| CN111541138B (en) * | 2020-04-17 | 2021-11-19 | 华南理工大学 | Device for inhibiting stimulated Brillouin scattering in high-power narrow-linewidth optical fiber laser |
| CN117498142A (en) * | 2023-11-02 | 2024-02-02 | 上海频准激光科技有限公司 | Optical signal amplifying device |
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Application publication date: 20190510 |