CN108574195A - A kind of highly doped erbium doped fiber laser of the tunable multi-wavelength of stabilization - Google Patents
A kind of highly doped erbium doped fiber laser of the tunable multi-wavelength of stabilization Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06791—Fibre ring lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—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
- H01S3/06712—Polarising fibre; Polariser
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- H—ELECTRICITY
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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
- 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
- H01S3/06716—Fibre compositions or doping with active elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
Abstract
The invention discloses a kind of highly doped erbium doped fiber lasers of the tunable multi-wavelength of stabilization, and which solve the multi-wavelength oscillation optical issues that output is stablized at room temperature and power is flat.The multiple-wavelength laser structure includes：Pumping source 1, wavelength division multiplexer WDM2, highly doped Er-doped fiber HEDF3, polarization isolator PD ISO4, polarization maintaining optical fibre PMF5, Polarization Controller PC6,3dB photo-coupler 7, the first single mode optical fiber SMF8, the second single mode optical fiber SMF9 and 90：The photo-coupler C10 of 10 splitting ratios.The pumping laser of 980nm is coupled into Er-doped fiber by wavelength division multiplexer, lasing light enters the comb filter that polarization isolator, polarization maintaining optical fibre and Polarization Controller are constituted, photo-coupler is returned to the 90% of the multi-wavelength oscillation light generated in loop in loop, 10% multi-wavelength oscillation light output, then laser enters properties in nonlinear optical loop mirror by 3dB photo-couplers, light after interference enters the first single mode optical fiber, finally returns to wavelength division multiplexer and forms an annular chamber.
Description
Technical field
The present invention relates to optical fiber laser field, the highly doped Er-doped fiber of tunable multi-wavelength of specifically a kind of stabilization swashs
Light device.
Background technology
With the fast development of high-capacity optical fiber communication network, to letter in wavelength-division multiplex technique and close wavelength-division multiplex technology
The requirement of road quantity is also more and more.Increase channel quantity as light source using multiple single wavelength lasers in conventional method
Method virtually causes the cost of system and complexity to increase.Accordingly, it may be possible to which the multi-wavelength of light source is provided for multiple channels simultaneously
Optical fiber laser becomes one of the hot spot of Multiwavelength Erbium-doped Fiber Laser research in recent years.Having property of multi-wavelength optical fiber laser
Can stable, simple in structure, wavelength number and range tunable, it is compatible with fibre system the advantages that, be widely used in
Microwave generates, optical sensing, spectrum analysis, the fields such as optical measurement.
The technology of most critical is how effectively to inhibit doped fiber gain in the multi-wavelength optical fiber laser of ambient-temp-stable
Broadening effect at normal temperatures, when the output wavelength interval of multiple-wavelength laser is less than the homogeneously broadening line width of gain fibre,
Inevitably there is serious mode competition and moding, this is a prodigious problem in practical applications.Current energy
Multi-wavelength output can also be generated by making optical fiber laser at room temperature, and the method that can be taken has：Er-doped fiber is immersed in liquid nitrogen
In it is cold；Introduce frequency shift feedback mechanism；Utilize the four-wave mixing effect in nonlinear optical fiber；Using cascade stimulated Brillouin scattering
Deng.Has a large amount of relevant report according to above method：Wang Xiao in 2016 is bright et al. to propose a kind of changeable and tunable mix
Ytterbium optical fiber ring laser realizes the single, double wavelength switching of output laser, two kinds of work by adjusting the Polarization Controller in loop
Pattern stablize at room temperature by output；Zou Hui in 2017 et al. is constructed a kind of adjustable based on novel Mach-Zender interferometer
Humorous multi-wavelength self-excitation Brillouin erbium-doped fiber laser obtains the multi-wavelength spectrum of 6 tunable wave lengths at room temperature；2017
Saleh S et al. are fed back based on random distribution, and 24 wavelength are realized using the four-wave mixing effect of 2km highly nonlinear optical fibers
Stabilized lasers are composed.But the doping process limitation that these method structures are complex and based on Er-doped fiber itself, it is used
Er-doped fiber generally require more than ten meters, introduce larger loss and cause its mode competition fiercer, it is used
Equipment cost is also bigger.
On the other hand, the multiple-wavelength laser of base Brillouin scattering or four-wave mixing is the hot spot of research in recent years, in cloth
Deep multiple-wavelength laser is to generate the effective ways of multi-wavelength output at room temperature, but the wavelength interval that brillouin effect generates is solid
Fixed and Brillouin non-linear gain is smaller, needs longer fiber lengths and larger pump power, this is further increased
The requirement of making apparatus, to the improvement of output characteristics have prodigious limitation.It is mixed that multi-wavelength optical fiber laser introduces four waves
Frequency effect is to redistribute the light energy between each wavelength, suppression mode competition, to defeated using four-wave mixing effect
Go out multi-wavelength, but realize that the cost of four-wave mixing effect is very high using highly nonlinear optical fiber, and uses general single mode light
Fibre introduces four-wave mixing effect, since single mode optical fiber nonlinear effect is not high, it is therefore desirable to what very long length and inhibition competed
Effect is simultaneously bad.In short, up to the present, realizing that the technology of the laser of stable multi-wavelength output cannot still meet at room temperature
The requirement of application.
Invention content
The object of the present invention is to provide a kind of highly doped erbium doped fiber lasers of the tunable multi-wavelength of stabilization, existing to solve
There is technology multiple wavelength output laser at room temperature, the problems such as stability, flatness be not high, and gain fibre is long and complex process.
In order to achieve the above object, the technical solution adopted in the present invention is：
A kind of highly doped erbium doped fiber laser of the tunable multi-wavelength of stabilization, it is characterised in that：Including pumping source, wavelength-division
Multiplexer, highly doped Er-doped fiber, Lyot comb filter, splitting ratio 90：10 photo-coupler, 3dB photo-couplers, first
Single mode optical fiber and the second single mode optical fiber, wherein the first single-mode optical fiber length is longer than the second single mode optical fiber, the second single mode optical fiber and 3dB
Photo-coupler is connected as circuit and constitutes properties in nonlinear optical loop mirror, and pumping source is connected by the input port of optical fiber and wavelength division multiplexer
It connects, it is 90 that the output port of wavelength division multiplexer, which passes sequentially through highly doped Er-doped fiber, Lyot comb filter and splitting ratio,：10
Photo-coupler input terminal connects, and the output end all the way of photo-coupler light splitting accounting 90% passes sequentially through nonlinear optical fiber annular
Mirror, the first single mode optical fiber are connected to wavelength division multiplexer input port, which is divided the another way output end of accounting 10%
Outside output signal light；
Pumping source provides the laser that centre wavelength is 980nm, and laser is coupled into highly doped er-doped light through wavelength division multiplexer
Fibre enters back into Lyot comb filter after highly doped Er-doped fiber gain and forms pectination laser, and pectination laser is through splitting ratio
90：After 10 photo-coupler, 90% pectination laser of output enters the 3dB photo-couplers in properties in nonlinear optical loop mirror, and
Two-way is divided by 3dB photo-couplers enters the second shorter single mode optical fiber of length and interfere, the laser after interfering is by non-
Linear optical fiber annular mirror is exported to longer first single mode optical fiber of length, is reentered after four-wave mixing in the first single mode optical fiber
Wavelength division multiplexer, then after wavelength division multiplexer light splitting is reentered by highly doped Er-doped fiber, Lyot comb filter successively
Than being 90：10 photo-coupler forms cycle；Splitting ratio is 90：10% pectination laser of 10 photo-coupler output is to outside
Multiple channels provide signal light.
A kind of tunable multi-wavelength highly doped erbium doped fiber laser of the stabilization, it is characterised in that：The height
Doping Er-doped fiber is a kind of high concentration erbium doped fiber LIEKKITM Er80-4/125 produced by the nLIGHT companies in the U.S.,
Its absorption coefficient reaches 80dB/m at 1530nm.
A kind of tunable multi-wavelength highly doped erbium doped fiber laser of the stabilization, it is characterised in that：Described
Lyot comb filter includes successively polarization isolator, polarization maintaining optical fibre, Polarization Controller, and the output port of wavelength division multiplexer is successively
It is 90 by polarization isolator, polarization maintaining optical fibre, Polarization Controller and splitting ratio：The input terminal of 10 photo-coupler connects, wherein
Polarization Controller is used for adjusting the polarization state of endovenous laser, realizes that centre wavelength and wavelength number are adjustable by adjusting polarization state
It is humorous.
A kind of tunable multi-wavelength highly doped erbium doped fiber laser of the stabilization, it is characterised in that：The guarantor
The double refractive inde of polarisation fibre is 5.16 × 10-4。
A kind of tunable multi-wavelength highly doped erbium doped fiber laser of the stabilization, it is characterised in that：Described
Four-wave mixing effect in one single mode optical fiber can effectively inhibit the mode competition in HOMOGENEOUS BROADENING gain media Er-doped fiber, from
And optical fiber laser is made to generate stable and flat multi-wavelength output at room temperature.
A kind of tunable multi-wavelength highly doped erbium doped fiber laser of the stabilization, it is characterised in that：The 3dB
Its splitting ratio of photo-coupler is 50:50.
A kind of tunable multi-wavelength highly doped erbium doped fiber laser of the stabilization, it is characterised in that：Described is non-
The cross-phase modulation effect of linear optical fiber annular mirror can cause nonlinear terms to be moved, and generate frequency chirp, constantly generate newly
Frequency causes spectrum width broadening, further suppresses mode competition, and to the power between balanced different wave length, it is flat to improve spectrum
Degree.
A kind of tunable multi-wavelength highly doped erbium doped fiber laser of the stabilization, it is characterised in that：Described
The model of one single mode optical fiber and the second single mode optical fiber is Corning SMF-28e+。
Present invention can apply in division multiplex fibre-optic communication wave system.Centre wavelength is that 980nm pump lights are multiple by wavelength-division
It is coupled into annular chamber, gain media of the highly doped Er-doped fiber as the laser with device, in erbium is fine particle occurs for pump light
Number inverts while obtaining the gain of light, and gain light enters the Lyot comb filterings being made of isolator, polarization maintaining optical fibre, Polarization Controller
Device, then laser two-way light is divided by three-dB coupler, 10% light passes through 10:90 photo-coupler is output to outside, and 90%
Laser return in loop and interfered in properties in nonlinear optical loop mirror and be output in the first single mode optical fiber of overlength, then return
Echo division multiplexing device forms an annular torus.
Highly doped Er-doped fiber can be unfavorable for forming stable more waves due to the mode competition between multiple wavelength lights at room temperature
Long output.The nonlinear factor of single mode optical fiber is relatively low, but its core area is smaller, has higher power density, can
To generate significant nonlinear effect, therefore the four-wave mixing effect in the first single mode optical fiber can be such that the light of different wave length mutually turns
Move energy, effective suppression mode competition.
When laser transmits in opposite directions in properties in nonlinear optical loop mirror, cross-phase modulation effect will cause refractive index in optical fiber
It changes, different wave length has embodied different refractive index in a fiber in spectrum, causes nonlinear phase shift, generates frequency Zhou
It sings, constantly generates new frequency, cause spectrum width broadening, further suppress mode competition, make to generate due to four-wave mixing effect
New frequencies of light rapidly becomes new signal light, to the power between balanced different wave length, improves spectral flatness.
The beneficial effects of the invention are as follows：
1. can effectively reduce gain fibre length as gain media by novel highly doped Er-doped fiber, system is reduced
System noise, reduces the requirement to pump power.
2. output wavelength number and the centre wavelength position of multiwavelength laser can be adjusted by adjusting Polarization Controller, and
Four-wave mixing effect in first single mode optical fiber, the pattern that restrained effectively in HOMOGENEOUS BROADENING gain media Er-doped fiber are competing
It strives, to obtain multi-wavelength output stable at room temperature.
3. solving the only imperfect situation of four-wave mixing effect inhibition, the stability and work(of signal are further increased
Rate flatness, adds properties in nonlinear optical loop mirror, which effectively introduces Cross-phase Modulation effect
It answers, improves spectral flatness, further improve the stability of system.
4. the present invention does not need high-power pumping source yet, exports more waves without putting at low ambient temperatures gain media
Long tunable and stability, flatness are fine, simple in structure to be easily achieved and at low cost, can obtain fiber optic communication low-loss window
The multiwavelength laser output of mouth C-band, has good application prospect for Networks of Fiber Communications.
Description of the drawings
Fig. 1 is the structural schematic diagram of highly doped erbium fibre multi-wavelength optical fiber laser；
Fig. 2 is multi-wavelength optical fiber laser embodiment output light spectrogram according to the present invention.
Wherein：1, pumping source, 2, wavelength division multiplexer WDM, 3, highly doped Er-doped fiber HEDF (LIEKKITM Er80-4/
125), 4, polarization isolator PD-ISO, 5, polarization maintaining optical fibre PMF, 6, Polarization Controller PC, 7,3dB photo-couplers, the 8, first single mode
Optical fiber SMF, the 9, second single mode optical fiber SMF, 10,90：10 photo-coupler C.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of highly doped erbium doped fiber laser of the tunable multi-wavelength of stabilization, including pumping source 1, wavelength-division
Multiplexer WDM2, highly doped Er-doped fiber HEDF3, Lyot comb filter, splitting ratio 90：10 photo-coupler C10,3dB
Photo-coupler 7, the first single mode optical fiber SMF8 and the second single mode optical fiber SMF9, wherein the first single mode optical fiber SMF8 length is longer than
Two single mode optical fiber SMF9, the second single mode optical fiber SMF9 are connected as circuit with 3dB photo-couplers 7 and constitute properties in nonlinear optical loop mirror,
Pumping source 1 is connect by optical fiber with the input port of wavelength division multiplexer WDM2, and the output port of wavelength division multiplexer WDM2 leads to successively
It is 90 to cross highly doped Er-doped fiber HEDF3, Lyot comb filter and splitting ratio：10 photo-coupler C10 input terminals connection, should
The output end all the way of photo-coupler C10 light splitting accountings 90% passes sequentially through properties in nonlinear optical loop mirror, the first single mode optical fiber SMF8
Wavelength division multiplexer WDM2 input ports are connected to, the another way output end of photo-coupler SMF8 light splitting accountings 10% exports outward
Signal light；
Pumping source 1 provides the laser that centre wavelength is 980nm, and laser is coupled into highly doped doped through wavelength division multiplexer WDM2
Erbium optical fiber HEDF3 enters back into Lyot comb filter after highly doped Er-doped fiber HEDF3 gains and forms pectination laser, pectination
Laser is 90 through splitting ratio：After 10 photo-coupler, 90% pectination laser of output enters in properties in nonlinear optical loop mirror
3dB photo-couplers 7, and divided by 3dB photo-couplers 7 and to enter the second shorter single mode optical fiber SMF9 of length for two-way and interfere,
Laser after interfering is exported by properties in nonlinear optical loop mirror to the longer first single mode optical fiber SMF8 of length, through the first single mode
Wavelength division multiplexer WDM2 is reentered in optical fiber SMF8 after four-wave mixing, then successively by highly doped after wavelength division multiplexer WDM2
It is 90 that Er-doped fiber HEDF3, Lyot comb filter, which reenters splitting ratio,：10 photo-coupler C10 forms cycle；Splitting ratio
It is 90：10% pectination laser of 10 photo-coupler C10 outputs provides signal light to external multiple channels.
Highly doped Er-doped fiber HEDF3 is a kind of high concentration erbium doped fiber produced by the nLIGHT companies in the U.S.
LIEKKITM Er80-4/125, absorption coefficient reach 80dB/m at 1530nm.
Lyot comb filter includes polarization isolator PD-ISO4, polarization maintaining optical fibre PMF5, Polarization Controller PC6, wave successively
The output port of division multiplexer WDM2 pass sequentially through polarization isolator PD-ISO4, polarization maintaining optical fibre PMF5, Polarization Controller PC6 with
Splitting ratio is 90：The input terminal of 10 photo-coupler C10 connects, and wherein Polarization Controller PC6 is used for adjusting the inclined of endovenous laser
Polarization state realizes that centre wavelength and wavelength number are tunable by adjusting polarization state.
The double refractive inde of polarization maintaining optical fibre PMF5 is 5.16 × 10-4。
Four-wave mixing effect in first single mode optical fiber SMF8 can effectively inhibit HOMOGENEOUS BROADENING gain media Er-doped fiber
In mode competition, stablize and the output of flat multi-wavelength to make optical fiber laser generate at room temperature.
Its splitting ratio of 3dB photo-couplers 7 is 50:50.
The cross-phase modulation effect of properties in nonlinear optical loop mirror can cause nonlinear terms to be moved, and generate frequency chirp, no
New frequency is given birth in stopping pregnancy, is caused spectrum width broadening, is further suppressed mode competition, to the power between balanced different wave length, is carried
EO-1 hyperion flatness.
The model of first single mode optical fiber SMF8 and the second single mode optical fiber SMF9 are Corning SMF-28e+。
The present invention devise it is a kind of at room temperature stablize highly doped Multiwavelength Erbium-doped Fiber Laser, have wavelength interval and
The tunability of wavelength number, structure are as shown in Figure 1.
Use output wavelength for the semiconductor laser of 980nm, power uses 500mw, and it is the highly doped of 62cm to choose length
Gain media of the miscellaneous Er-doped fiber as the laser, absorption coefficient are 80 ± 8dB/m at 1530nm.What example used mixes
There are optimum lengths for erbium optical fiber, when fiber lengths are less than optimum length, it may appear that erbium fibre leads to the insufficient of pump absorption
Gain declines, and the increase of output spectrum burr is shown as on spectrometer；And erbium it is fine long when, the erbium in front portion optical fiber
Ion has fully absorbed pump light, causes transmission pump power to be gradually reduced, when pump power drops to erbium ion exciting power
Threshold value below when, the erbium fibre that can not be effectively formed population inversion, therefore have more is not only to laser without amplification, instead
The laser energy for absorbing part output, makes system gain decline, while also will increase the noise of system, influences system stabilization
Property.It is optimum fiber length under current input power that 62cm erbium fibres are used in example.
Pump light enters the ports 980nm of 980/1550nm wavelength division multiplexers by pigtail coupling.Then multiple by wavelength-division
Enter highly doped Er-doped fiber with device output port, particle is largely pumped to pumping level in erbium fibre, and particle is in the pumping level longevity
It orders extremely short, is quickly transferred to metastable energy level in a manner of non-radiative, population inversion distribution is realized, when there are an optical maser wavelengths
Photon when, stimulated radiation will be induced, this light can result from previous spontaneous radiation, can be from being excited in previous
Radiation.The excited radiation light of amplification by by Polarization Controller, polarization isolator and a segment length be 12m polarization maintaining optical fibre together
Lyot comb filter is constituted, transfer function is：
In formula：λ is operation wavelength, θ1For the angle of the polarizer and polarization maintaining optical fibre fast axle, θ2For the folder of analyzer and polarization maintaining optical fibre fast axle
Angle,For Polarization Controller introduce phase delay,For phase delay caused by polarization maintaining optical fibre；Two neighboring transmission peaks
Between wavelength interval be Δ λ=λ2/ (Δ nL), therefore can be defeated to change by changing the effective length L of polarization maintaining optical fibre
Go out the wavelength interval of laser spectrum, Polarization Controller is used for adjusting the polarization state of endovenous laser, it is possible to be polarized by adjusting
Controller controls output center wavelength and output wavelength number.
The comb δ function formula of output enters the first single mode optical fiber of 12km, and the first single mode optical fiber act as providing four-wave mixing effect
It answers, Er-doped fiber can be unfavorable for forming stable multi-wavelength output due to the mode competition between multiple wavelength lights at room temperature.Single mode
The nonlinear factor of optical fiber is relatively low, but its core area is smaller, has higher power density, can generate significant
Nonlinear effect, therefore the four-wave mixing effect in optical fiber can make the light of different wave length mutually shift energy, effectively inhibit mould
Formula competes.Phase can be adjusted in multi-wavelength annular chamber by adjusting the plectrum of Polarization Controller so that four-wave mixing
The energy of multi-wavelength mutually shifts in the process, to reach a kind of dynamic equilibrium, realizes stable multi-wavelength output.
Splitting ratio not 10:The lasing light that entire annular chamber generates is divided into 10% and 90% two beams by 90 photo-coupler
Light, from 90% port export light feed back into annular chamber, recycled again, each time in cyclic process, constantly realize by
The amplification for swashing radiant light, when gain is more than the transmission loss of radiant light in the loop, entire laser ring resonator formation is shaken
It swings, to make multiwavelength laser constantly export.As shown in Fig. 2, the output laser display by 10% obtains the reality on spectrometer
The multiwavelength laser spectrum of example.
The multiwavelength laser of intracavitary enters by 50:The second single mode optical fiber of 50 couplers and one section of 3km form non-linear
Fiber loop mirror, when can be understood as the light of two beams or multi beam different frequency in annular mirror and propagating in a fiber, in addition to itself
Strength Changes can cause outside nonlinear phase shift, it is necessary to consider influence of other frequencies of light to optical fibre refractivity, further generate
Nonlinear phase shift, i.e. cross-phase modulation effect.When light transmits in opposite directions in annular mirror, cross-phase modulation effect will cause light
Refractive index changes in fibre, and different wave length has embodied different refractive index in a fiber in spectrum, causes nonlinear phase shift,
Frequency chirp is generated, new frequency is constantly generated, causes spectrum width broadening, further suppress mode competition, make due to four-wave mixing
The new frequencies of light that effect generates rapidly becomes new signal light, and to the power between balanced different wave length, it is flat to improve spectrum
Smooth degree finally returns to wavelength division multiplexer, forms an annular torus.
Claims (8)
1. a kind of highly doped erbium doped fiber laser of the tunable multi-wavelength of stabilization, it is characterised in that：It is multiple including pumping source, wavelength-division
With device, highly doped Er-doped fiber, Lyot comb filter, splitting ratio 90：It is 10 photo-coupler, 3dB photo-couplers, first single
Mode fiber and the second single mode optical fiber, wherein the first single-mode optical fiber length is longer than the second single mode optical fiber, the second single mode optical fiber and 3dB light
Coupler is connected as circuit and constitutes properties in nonlinear optical loop mirror, and pumping source is connected by the input port of optical fiber and wavelength division multiplexer
It connects, it is 90 that the output port of wavelength division multiplexer, which passes sequentially through highly doped Er-doped fiber, Lyot comb filter and splitting ratio,：10
Photo-coupler input terminal connect, the photo-coupler light splitting accounting 90% output end all the way pass sequentially through properties in nonlinear optical loop mirror,
First single mode optical fiber is connected to wavelength division multiplexer input port, forms annular chamber；The photo-coupler is divided the another way of accounting 10%
The outside output signal light of output end；Pumping source provides the laser that centre wavelength is 980nm, and laser is coupled into through wavelength division multiplexer
Highly doped Er-doped fiber enters back into Lyot comb filter after highly doped Er-doped fiber gain and forms pectination laser, and pectination swashs
Light is 90 through splitting ratio：After 10 photo-coupler, 90% pectination laser of output enters the 3dB in properties in nonlinear optical loop mirror
Photo-coupler, and two-way is divided by 3dB photo-couplers enters the second shorter single mode optical fiber of length and interfere, after interfering
Laser exported to longer first single mode optical fiber of length, through four-wave mixing in the first single mode optical fiber by properties in nonlinear optical loop mirror
After reenter wavelength division multiplexer, then think highly of successively by highly doped Er-doped fiber, Lyot comb filterings after wavelength division multiplexer
It is 90 newly to enter splitting ratio：10 photo-coupler forms cycle；Splitting ratio is 90：10% pectination of 10 photo-coupler output
Laser provides signal light to external multiple channels.
2. a kind of highly doped erbium doped fiber laser of tunable multi-wavelength of stabilization according to claim 1, feature exist
In：The highly doped Er-doped fiber is a kind of high concentration erbium doped fiber LIEKKITM produced by the nLIGHT companies in the U.S.
Er80-4/125, absorption coefficient reach 80dB/m at 1530nm.
3. a kind of highly doped erbium doped fiber laser of tunable multi-wavelength of stabilization according to claim 1, feature exist
In：The Lyot comb filter successively include polarization isolator, polarization maintaining optical fibre, Polarization Controller, wavelength division multiplexer it is defeated
It is 90 that exit port, which passes sequentially through polarization isolator, polarization maintaining optical fibre, Polarization Controller and splitting ratio,：The input terminal of 10 photo-coupler
Connection, wherein Polarization Controller are used for adjusting the polarization state of endovenous laser, and centre wavelength and wavelength are realized by adjusting polarization state
Number is tunable.
4. a kind of highly doped erbium doped fiber laser of tunable multi-wavelength of stabilization according to claim 3, feature exist
In：The double refractive inde of the polarization maintaining optical fibre is 5.16 × 10-4。
5. a kind of highly doped erbium doped fiber laser of tunable multi-wavelength of stabilization according to claim 1, feature exist
In：Four-wave mixing effect in first single mode optical fiber can effectively inhibit in HOMOGENEOUS BROADENING gain media Er-doped fiber
Mode competition, to make optical fiber laser generate stable and flat multi-wavelength output at room temperature.
6. a kind of highly doped erbium doped fiber laser of tunable multi-wavelength of stabilization according to claim 1, feature exist
In：Described its splitting ratio of 3dB photo-couplers is 50:50.
7. a kind of highly doped erbium doped fiber laser of tunable multi-wavelength of stabilization according to claim 1, feature exist
In：The cross-phase modulation effect of the properties in nonlinear optical loop mirror can cause nonlinear terms to be moved, and generate frequency chirp, no
New frequency is given birth in stopping pregnancy, is caused spectrum width broadening, is further suppressed mode competition, to the power between balanced different wave length, is carried
EO-1 hyperion flatness.
8. a kind of highly doped erbium doped fiber laser of tunable multi-wavelength of stabilization according to claim 1, feature exist
In：The model of first single mode optical fiber and the second single mode optical fiber is Corning SMF -28e+。
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| CN112397979A (en) * | 2020-11-16 | 2021-02-23 | 北京邮电大学 | Single-longitudinal-mode narrow-linewidth optical fiber laser based on double-coupling optical fiber ring and Mach-Zehnder filter |
| CN112886372A (en) * | 2021-01-13 | 2021-06-01 | 电子科技大学 | Multi-port output multi-wavelength laser pulse generation system |
| CN113572003A (en) * | 2021-07-05 | 2021-10-29 | 杭州电子科技大学 | Channel interval tunable multi-wavelength fiber laser based on double Sagnac rings |
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