CN103928834B - A kind of super-narrow line width FDML ring laser based on SOA - Google Patents
A kind of super-narrow line width FDML ring laser based on SOA Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of super-narrow line width FDML ring laser based on SOA, it is formed an annular chamber by optoisolator, semiconductor optical amplifier SOA, tunable optic filter, the first coupler, feedback loop, the second coupler, the first single-mode fiber ring, and feedback loop includes: optical circulator, high Rayleigh scattering optical fiber ring, tunable attenuator, the 3rd single-mode fiber ring, the first Polarization Controller, the 4th single-mode fiber ring, the second Polarization Controller.The advantage that the super-narrow line width FDML ring laser based on SOA that the embodiment of the present invention provides is provided simultaneously with super-narrow line width and tunable wave length.
Description
Technical field
The present invention relates to fiber optic communication and optical fiber measurement field, particularly relate to a kind of super-narrow line width FDML ring based on SOA
Shape laser instrument.
Background technology
Fourier locked mode (Fourier Domain Mode Locking is called for short FDML) represents a kind of brand-new laser work
Make state.Entirely different with the locked mode mechanism of traditional amplitude modulation(PAM) or phase-modulation, FDML is the lock of a kind of spectrum modulation
Mould mode, the laser that FDML laser instrument output frequency scans continuously, can compressed output ultrashort laser pulse sequence, all
Scan frequency information is stored in laserresonator (usually annular chamber) in the form of light.FDML is also a kind of generally meaning
Wavelength-swept laser (Wavelength Swept Laser is called for short WSL) in justice, realizes in certain wave-length coverage
High speed wavelength scans continuously, and instantaneous output peak power is high, the laser of line width.
Narrow linewidth laser has that pumping threshold is low, conversion efficiency is high, good heat dissipation effect, tuning range width, coupling efficiency are high,
The features such as compact conformation, are widely used in Fibre Optical Sensor, optical fiber remote sensing high accuracy light by its narrow linewidth, low noise and other advantages
Spectrum and fiber optic communication field, can greatly promote wide range sensing, the development of telemeasurement laser radar.
2000, southwest handed over great Pan bright around utilizing semiconductor optical amplifier (Semiconductor Optical Amplifier, letter
Claim SOA) as core devices, cooperation tail-fiber type mechanical tuning bandpass filter is as modeling element, by online optical fiber coupling
Clutch, isolator and single-mode fiber etc. constitute external cavity type tunable fiber ring resonator semiconductor laser instrument (FRSLs), theoretically
Establish the physical model of FRSLs, obtain being applicable to the Single-Mode Traveling-Wave rate equation of FRSLs, simplified after obtained light
The analytical expression of subflow Density Distribution, has carried out quantitative analysis to the performance of FRSLs；Set up the experiment dress of FRSLs
Put and test system accordingly, it is achieved the dynamic single longitudinal mode tuning under high-repetition-rate, obtaining stable single-frequency light pulse output.
Use radio-frequency current directly modulation, it is thus achieved that repetition rate is big less than 100ps, tuning range higher than 1GHz, half value full duration
Short optical pulse in 36nm arranges.From existing document, the work of doctor Pan Wei is probably domestic the earliest about tunable SOA
The report of annular cavity laser, but, regrettably, he does not mention any thing about Fourier locked mode.
2009, Zhejiang University Chen Da such as described basic conception and the operation principle of FDML optical fiber laser, builds
Continuous wave FDML optical fiber laser is also applied to Fiber Bragg Grating FBG (Fiber Bragg Grating is called for short FBG)
Demodulation.In annular chamber, add the wave filter of fixed wave length, it is achieved a kind of frequency spectrum limited FDML optical fiber laser, inquire into
The application in terms of FBG multi-point sensing of this technology, and combine Raman amplifiction and achieve remote stress sensing.
Present Research that Ding Zhihua, Chen Minghui et al. reviewed rapid frequency-sweeping light source in 2009 and progress, describe based on
The optimal frequency domain imaging technique of rapid frequency-sweeping light source and application, and the becoming of subject matter that this field is existed and technology development
Gesture is inquired into.2011, they reported a kind of broadband fast linear wavelength based on grating polygonal mirror tuning filtering device
Scan laser.Tuning filtering device is made up of grating and polygonal rotating mirror, have employed non-telescope Littrow layout.At laser
Resonator have employed double semiconductor optical amplifiers that spontaneous emission light spectral limit is expanded each other, and guarantee both are used in parallel
Wide spectral range.Wavelength scanning range is 170nm, and centre wavelength is 1312nm.When the rotating speed of polygonal mirror reaches 695r/s,
Length scanning speed is 50kHz, and corresponding laser output mean power is 2mW.
S.H.Yun in 2004 et al. reports a kind of length scanning utilizing diffraction grating and oscillating mirror to make wave filter
Laser instrument.Laser instrument one centre wavelength SOA near 1310nm does gain media；By a diffraction grating and
The speculum of one vibrations realizes filtering, and when speculum rotates to certain angle, only corresponding wavelength can return in laser instrument,
Thus realize filter action.Experiment can control laser wavelength scanning scope by adjusting the driving signal of speculum and sweep
Retouch frequency.It is 80nm that experiment has obtained wavelength scanning range, and scan frequency is 500Hz, and instantaneous spectrum live width is less than 0.06nm
Laser.2005, R.Huber et al. reported Wavelength-swept laser.This laser instrument is formed one by single-mode fiber
Individual annular chamber, does gain media with SOA, and wave filter is adjustable optic fibre Fabry-Perot wave filter.This laser instrument is at 20kHz
Wavelength scan frequency under power output up to 45mW.
R.Huber analyzes the shortcoming of traditional Wavelength-swept laser, for traditional length scanning optical fiber laser, often
When wave filter is through wavelength shift, and the vibration mode in laser cavity can be disturbed, and new starting of oscillation pattern will be from gain media before
Spontaneous radiation in re-establish again.Every time change filter through wavelength, laser instrument will re-establish stable
Operational mode, therefore, laser instrument from spontaneous radiation to forming the time restriction length scanning speed of laser, here it is traditional
Wavelength-swept laser scan frequency be difficult to improve an important bottleneck.
Comparing with tradition Wavelength-swept laser, FDML laser instrument overcomes wavelength shift to be needed to re-form from spontaneous radiation
The shortcoming of laser.Therefore, its length scanning speed significantly improves.R.Huber in 2006 et al. proposes a kind of Fourier
Territory mode locked fiber laser, and give the time domain specification of output laser under several different scanning frequency, wherein maximum wavelength is swept
Retouching frequency and be up to 290kHz, wavelength scanning range is more than 100nm.
The artificial FDML laser instrument such as Christian Jirauschek in 2009 proposes a kind of theoretical model, passes through numerical simulation
Time domain change curve and the laser center wavelength versus time curve of laser amplitude are drawn.Result proves, single-mode fiber
In dispersion, nonlinear factor the least on the impact of laser amplitude, and detour the time in filter wavelength scan period and chamber
When not mating, the biggest on laser amplitude impact.And in several years subsequently, they utilize this theoretical model, analyze annular
The impact that FDML laser instrument is exported by each physical effect in chamber, including dispersion, Self-phase modulation and SOA gain recovery and
The factors such as linewidth enhancement factor.
Benjamin in 2009 et al. experimental study fibre-optical dispersion, filter bandwidht are to FDML laser instrument instantaneous spectrum line
Wide impact.And in a year subsequently, design a kind of electrooptical modulation method, can directly measure FDML laser instrument instantaneous
Spectral line width, electrooptical modulation method overcomes this shortcoming, and it drives with a signal identical with FDML laser scans
One electrooptic modulator, electrooptic modulator can only allow every time the light in very short time by (the most a few ns) because drive signal and
Scan period synchronizes, and the wavelength of the light every time passed through is the most identical.Thus can directly measure the instantaneous light of FDML laser instrument
Spectral line width.
At present the common technology of narrow linewidth single-longitudinal-mode fiber laser has: (1) meet in controlling and utilizing chamber the polarization state of light wave
Eliminate the incoherent technology of the spatial hole burning that standing wave effect causes；(2) use Fiber Bragg Grating as laser cavity in chamber
Mirror, can obtain the arrowband output of laser；(3) in laser cavity, add non-pumping doped fiber carry out frequency-selecting and suppress the full of mode hopping
With absorber technical scheme；(4) due to effective utilization of nonlinear effects various in optical fiber, occur in that the most again based on
Brillouin scattering or the narrow cable and wide optical fiber laser of Rayleigh scattering.
2003, Jae Chul Yong utilized non-equilibrium MZ interferometer Coupled Feedback/output, and Distributed Feedback Laser pumping realizes
Single-frequency continuous light Brillouin optical fiber laser, longitudinal mode position affects laser instrument single longitudinal mode with the relative position of brillouin gain peak value
Or many longitudinal mode, use and stablize feedback loop technology from motion tracking and achieve single-frequency steady operation, pumping light power 26.4mW
Time Brillouin laser power output about 3.18mW, power swing suppresses below 4%, records live width less than 1kHz.
Zhu Tao, Bao Xiaoyi et al. utilize stimulated rayleigh scattering to realize longitudinal mode suppression, enter single longitudinal mode super-narrow line width optical fiber laser
Go detailed research.2010, observed stimulated rayleigh scattering phenomenon in a fiber, and point out that this phenomenon can be used for swashing
Optical linewidth compresses, and preliminary theory analysis shows that the method can realize the super-narrow line width laser output of tens of Hz, and can be real
The Wavelength tunable of existing ultra wide band range.Within 2011, achieving the tunable laser output less than 2KHz of the 3dB live width, output swashs
Light side mode suppression ratio (SMSR) reaches 70dB, has carried out wavelength tuning in the range of 0.6nm, and luminous power is up to 5dBm.
2013, utilize 21 that are about on the optical fiber of 110m distribution and draw wimble structure, it is achieved mode suppression and linewidth compression, then
Secondary reporting single longitudinal mode super-narrow line width laser instrument based on Rayleigh scattering, experiment obtains Output of laser live width about 200Hz.Enter one
Step, they introduce self seeding feedback system, it is thus achieved that the live width single-longitudinal-mode fiber laser less than 130Hz, and SMSR is up to
75dB。
At fiber optic communication field, following high bandwidth, the optical communication system of high transfer rate need high-quality light source, especially
It is in terms of the real time high-speed measurement of the wavelength dependence energy of optical communication system, requires the highest to the dynamic characteristic of light source, and
And wavelength tuning characteristic is also one of important parameter, super-narrow line width FDML laser instrument relies on its good dynamic tuning characteristic,
Can be used for the dispersion of optical fiber telecommunications system, polarization mode dispersion etc. to measure at a high speed and spectrum analysis.
Summary of the invention
The invention provides a kind of super-narrow line width, a kind of based on SOA super-narrow line width FDML annular of tunable wave length swashs
Light device.
First aspect, embodiment of the present invention provides a kind of super-narrow line width FDML ring laser based on SOA, described
Super-narrow line width FDML ring laser based on SOA is by optoisolator, semiconductor optical amplifier SOA, tunable filtering
Device, the first coupler, feedback loop, the second coupler, first single-mode fiber ring one annular chamber of composition, wherein:
Described feedback loop includes: optical circulator, high Rayleigh scattering optical fiber ring, tunable attenuator, the 3rd single-mode fiber ring,
First Polarization Controller, the 4th single-mode fiber ring, the second Polarization Controller；
Light beam is by described first coupler output, and enters into described optical circulator by the first port of described optical circulator；
Entering the light beam second port output by described optical circulator of described optical circulator, a part of light beam arrives described high Rayleigh and dissipates
Penetrating fiber optic loop and produce back rayleigh scattering light, another part light beam continues the transmission described tunable attenuator of arrival and forms straight-through light
Bundle；Described Straight-Through Beam is transported to the first port of described second coupler through tuning and described 3rd single-mode fiber ring；
Described back rayleigh scattering light returns to the second port of described optical circulator and enters described optical circulator, and by described light annular
3rd port output of device, sequentially passes through described second Polarization Controller, described 4th single-mode fiber ring, described first polarization
Export after second port ECDC bundle of controller described second coupler of arrival.
Second aspect, at a kind of based on SOA the super-narrow line width FDML ring laser according to embodiment of the present invention,
Described semiconductor optical amplifier SOA makes described super-narrow line width FDML ring laser based on SOA by spontaneous radiation
There is spontaneous radiation source, every sub-beams is exaggerated through described semiconductor optical amplifier SOA, to realize stimulated radiation product
Raw laser.
The third aspect, at a kind of based on SOA the super-narrow line width FDML ring laser according to embodiment of the present invention,
Described optoisolator is provided with the first optoisolator and the second optoisolator, described first optoisolator and described second optically isolated
Device arranges the two ends being positioned at described semiconductor optical amplifier SOA, is used for making described light beam one-way transmission.
Fourth aspect, at a kind of based on SOA the super-narrow line width FDML ring laser according to embodiment of the present invention,
The carrier recovery time of described semiconductor optical amplifier SOA is 300ps.
5th aspect, at a kind of based on SOA the super-narrow line width FDML ring laser according to embodiment of the present invention,
Described annular chamber reserves two ports, and port type is set to annular connector FC/ dimpling polishing connector APC, remaining
Connected by the method for welding between element.
6th aspect, at a kind of based on SOA the super-narrow line width FDML ring laser according to embodiment of the present invention,
Length according to described annular chamber inner fiber selects described first coupler and the optimal splitting ratio of described second coupler；Institute
The splitting ratio stating the first coupler is set to 30:70, and the splitting ratio of described second coupler is set to 50:50.
7th aspect, at a kind of based on SOA the super-narrow line width FDML ring laser according to embodiment of the present invention,
Described tunable optic filter requires to select wavelength according to design sweep speed, to realize filtering.
Eighth aspect, at a kind of based on SOA the super-narrow line width FDML ring laser according to embodiment of the present invention,
The drive circuit of described semiconductor optical amplifier SOA and described tunable optic filter is closed by based on FPGA Direct Digital frequency
Become to realize.
9th aspect, at a kind of based on SOA the super-narrow line width FDML ring laser according to embodiment of the present invention,
Described adjustable attenuator controls described back rayleigh scattering light and described Straight-Through Beam ratio in ring so that described the most auspicious
The bandwidth of light beam in described annular chamber is compressed by profit scattered light further, finally realizes narrow-linewidth laser output.
Tenth aspect, at a kind of based on SOA the super-narrow line width FDML ring laser according to embodiment of the present invention,
If whole fiber lengths is set to ring length, a length of Fiber2 of described high Rayleigh scattering optical fiber, described first single-mode optics
Fine ring length is Fiber1, described 3rd single-mode fiber ring length is Fiber3, described 4th single-mode fiber ring length is Fiber4,
Then the length of each several part optical fiber meets following condition:
Fiber3=Fiber2+Fiber4；Ring length=Fiber1+Fiber2+Fiber3.
Because using super-narrow line width FDML ring laser based on SOA, technique scheme has the advantages that
(1) Fourier locked mode FDML mode of operation is taked, it is possible to be greatly improved length scanning speed, breach tradition
The length scanning speed of Wavelength-swept laser is carried by optic fiber ring-shaped cavity length, filter tuner speed, gain media metastable state
Flowing the restrictions such as sub-life-span, broken the limitation being difficult to high sweep speed, sensing for optic communication and light provides high speed wavelength to adjust
Humorous laser instrument；
(2) mode of stimulated rayleigh scattering feedback is used, it is achieved while the function of super-narrow line width, do not affect FDML annular chamber
Resonance problems, can be coherent measurement provide high-quality light source.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing skill
In art description, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to root
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the optic fiber ring-shaped cavity scan laser schematic diagram according to one embodiment of the present invention；
Fig. 2 is according in Fu based on semiconductor optical amplifier SOA and stimulated rayleigh scattering of one embodiment of the present invention
Leaf territory locked mode FDML optical fiber laser schematic diagram；
Fig. 3 is the super-narrow line width FDML ring laser schematic diagram based on SOA according to one embodiment of the present invention；
Fig. 4 is the laser spectrum during annular chamber scan laser output continuous wavelength according to one embodiment of the present invention；
Fig. 5 is that the Fabry-Perot tunable wavelength filter triangular wave drive circuit according to one embodiment of the present invention is defeated
Go out.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
(1) performance test of annular chamber scan laser and the realization of stimulated rayleigh scattering
Embodiment of the present invention provides a kind of super-narrow line width FDML ring laser based on SOA.First, optical fiber is built
Annular chamber scan laser 100, as it is shown in figure 1, comprising: semiconductor optical amplifier SOA the 101, first optoisolator
1021, the second optoisolator 1022, tunable optic filter 103, coupler 104.Semiconductor optical amplifier SOA 101 makees
For spontaneous radiation source and the amplifying device of optic fiber ring-shaped cavity scan laser, spontaneous by semiconductor optical amplifier SOA 101
Radiation makes laser instrument there is spontaneous radiation source, and every sub-beams, can be by semiconductor when semiconductor optical amplifier SOA 101
Image intensifer SOA 101 amplifies, and finally realizes stimulated radiation and produces laser.First optoisolator 1021, second is optically isolated
Device 1022 arranges the two ends being positioned at semiconductor optical amplifier SOA 101, for making optic fiber ring-shaped cavity scan laser 100
In ring, light transmits along prescribed direction one-way.Tunable optic filter 103 makes filtering under the effect of drive circuit 1031
Device can require to select wavelength on a large scale according to design sweep speed, it is achieved filtering.Coupler 104 reasonably distributes output and swashs
Light and the laser of ring inner loop, it is achieved the beam splitting of laser.
Experiment obtains the high speed tuning process of non-linear gain process based on semiconductor optical amplifier SOA 101 and wave filter,
And the relation of the output characteristics of Fourier locked mode FDML and each parameter of system, including semiconductor optical amplifier SOA 101
Gain, phase place, noise, carrier Restoration dynamics process, drive electric current, semiconductor optical amplifier SOA 101 structure and
Size, wave filter through all many reference amounts of characteristic, tuned speed, the polarization characteristic of annular chamber, loss, dispersion etc. to light
The impact of fibre annular-type cavity scan laser 100, obtains constituting the performance of optic fiber ring-shaped cavity scan laser 100 each several part device
Test result.Develop high Rayleigh scattering medium based on silica fibre or structure simultaneously, suppress other nonlinear scattering process,
Strengthen Rayleigh scattering feedback, and utilize the measurement laser such as high-speed oscilloscope to set up process, including longitudinal mode suppression, linewidth compression etc.
Phenomenon, and laser sets up the difference of process in homogeneously broadening medium (such as EDF) and inhomogeneous broadening (such as SOA) medium
Different.Observe on this basis in the range of the gain spectral of inhomogeneous broadening medium SOA, Rayleigh scattering realize longitudinal mode suppression and
The process of linewidth compression；The detection active medium carrier lifetime influence to stimulated rayleigh scattering, observes it to instead subsequently
Feedforward gain process and the impact of linewidth compression.Final Selection utilization inhomogeneous broadening medium SOA as gain media, due to
The carrier lifetime of SOA the most hundreds of general ps, the carrier of the semiconductor optical amplifier SOA 101 of the embodiment of the present invention returns
The multiple time is 300ps, 7-8 magnitude less than now widely used EDF, and it is poor that consequent laser sets up process existence
Different, so on the basis of the doped fiber ring laser above set up, proposing such as the research approach of Fig. 2, simultaneously will dorsad
Rayleigh scattering light and straight-through light feed back co-implanted semiconductor optical amplifier SOA 101, transmit, finally realize in annular chamber
Super-narrow line width FDML laser instrument based on SOA.
(2) annular chamber is realized dispersion management and wavelength scaling, it is achieved Fourier locked mode mode of operation.
Multi-wavelength resonance in Fourier locked mode FDML fiber laser cavity, the dispersion of annular chamber can affect high-velocity scanning wavelength
Output, the dispersion management technique of optical fiber link is the most highly developed, have accumulated abundant by experiment
Achievement in research and experience, therefore, combining with theoretical analysis and experimental study, dispersion management technique is used for Fourier locked mode
FDML, improves sweep bandwidth, improves output spectrum characteristic.Use multiple dispersion management method, including ordinary optic fibre additive color
Dissipate compensated optical fiber, dispersion shifted optical fiber, chirp grating etc., adjust the look in the range of Fourier locked mode FDML scanning wavelength
Dissipate characteristic, reduce the transmission time delay difference in the range of full bandwidth, it is achieved wide bandwidth, power equalization, fast wave long scan laser are defeated
Go out, it is achieved the dispersion to annular chamber is controlled and manages.
Finally realize Fourier locked mode FDML optical fiber laser defeated by controlling tunable optic filter 103 scanning mode
Go out the control of wavelength.Owing to the centre wavelength of tunable optic filter 103 is non-linear relation with the voltage being applied on PZT,
And every time the position of PZT is different after the end of scan, the version of each scanning curve is the most variant, it is impossible to use
Curve matching obtains unified mathematic(al) representation；And PZT not only influence by voltage, environment temperature also can change PZT
Duty, experiment shows, temperature changes 10 DEG C, and under same voltage, the centre wavelength of tunable optic filter 103 changes 3-5nm.
So the Fourier locked mode each scanning process of FDML optical fiber laser needs to carry out tunable optic filter 103 dynamically
Demarcate.
Concrete scaling method is as follows: use etalon and absorption air chamber to realize Fourier locked mode FDML optical fiber laser defeated
Going out the dynamic calibration of wavelength, constitute closed loop control process, by the demarcation of wavelength, dynamically adjust PZT scanning voltage, making can
Tuning filtering device 103 is operated in a controlled stable state, thus it is defeated to realize Fourier locked mode FDML optical fiber laser
Go out the controlled of wavelength and demarcate.Etalon reality is also a pectination tunable optic filter 103, between adjacent two transmission peaks
Be spaced apart 0.8nm, the free spectral range of tunable optic filter 103 is divided into 100 intervals, the voltage in each interval
Change to wavelength is regarded as linear.During Fourier locked mode FDML laser wavelength scanning, simultaneously also can to pectination
Tuning filtering device 103 is scanned, and instantaneous output spectrum must be in certain interval of pectination tunable optic filter 103, so
Rear use linear interpolation can be obtained by the accurate location of Fourier locked mode FDML laser output wavelength.
But our accepted standard tool pectination tunable optic filter 103 also can be affected by temperature, when temperature change 100 DEG C
Time, the position excursion 2-5pm of each peak value of pectination tunable optic filter 103, therefore calibration device also brings along measure error.
Owing to the absorption line of gas varies with temperature minimum, in order to correct the error that pectination tunable optic filter 103 brings, available
The air chamber absorption spectrum injecting acetylene gas is demarcated.Can be right by pectination tunable optic filter 103 after carrying out single pass
Absworption peak is demarcated, and the result obtained is i.e. the measure error caused by temperature with the difference of the absorption line of standard, uses this
Laser output wavelength is demarcated by individual error, so can realize controlling the output of laser wavelength accurately, the most also
Achieve Fourier locked mode FDML mode of operation.
(3) design driven and control circuit.
The Primary Component of super-narrow line width FDML laser instrument includes semiconductor optical amplifier SOA 101, tunable optic filter 103
With high Rayleigh scattering medium, first we will design and develop semiconductor optical amplifier SOA 101 and tunable optic filter 103
Driving (including direct current, exchange) and temperature control.The driving electric current continuously adjustabe of semiconductor optical amplifier SOA 101,
Temperature is the most controlled, and frequency and amplitude that exchange drives are the most adjustable.
By measuring the electrology characteristic parameter obtaining tunable optic filter 103, including equivalent resistance, inductance and electric capacity, to survey
Amount data be according to design driven and control system, the tuning characteristic of research tunable optic filter 103, including centre wavelength and
The linear relationship of driving voltage, Tuning Mechanism and tuned frequency etc., the scheme of research more than MHz ultrahigh speed tuning and technology,
The parameters such as the driving function of tunable optic filter 103, frequency, voltage and amplitude are the most adjustable, and operating temperature is adjustable.
Realization in terms of circuit drives: semiconductor optical amplifier SOA 101 and the driving of tunable optic filter 103 and control
Circuit part uses and generates random waveform based on FPGA direct digital synthesis technique (DDS) technology, it is achieved arbitrary function ripple
Shape frequency, amplitude, the regulation of level, design waveform signal amplifying circuit meets the driving voltage of tunable optic filter 103.
Control part mainly temperature control, outside regulation and display, including three aspects: use peltier-element and thermistor
Realize temperature control；The signal of the control buttons such as frequency acquisition, amplitude, function, is input to FPGA, completes output waveform
Frequency and the control of the parameter such as amplitude；Output frequency, amplitude, level, temperature information are to display screen.Environment temperature exists
During the change of 10-40 degree, temperature control circuit makes tunable optic filter 103 be operated in 25 degree, temperature fluctuation < 0.1 degree.
The realization of Fourier locked mode FDML: usually, the fundamental frequency of optic fiber ring-shaped cavity is relevant with optical maser wavelength, Fourier
The integral multiple of the fundamental frequency that territory locked mode FDML laser instrument requires wavelength scan frequency to be optic fiber ring-shaped cavity, therefore, only at light
During fibre annular-type cavity non-dispersive, the scan frequency coupling in the range of full bandwidth could be realized, it is achieved Fourier locked mode FDML.
Semiconductor optical amplifier SOA 101 and the time of tunable optic filter 103 is arrived from the Rayleigh scattering light of diverse location scattering
Difference, the most in fig. 2, on high Rayleigh scattering optical fiber ring 1062, the back rayleigh scattering light of diverse location will experience not simultaneous interpretation
Defeated time delay feedback returns to semiconductor optical amplifier SOA 101, and therefore, we can only ensure that abundant Rayleigh scattering light passes through
Semiconductor optical amplifier SOA 101 and tunable optic filter 103, form resonance output, it is achieved super-narrow line width Fourier is locked
Mould FDML laser instrument.In order to make Rayleigh scattering light and pump light concurrently form resonance, whole fiber lengths is set to ring
Length, a length of Fiber2 of high Rayleigh scattering optical fiber ring 1062, the first a length of Fiber1 of single-mode fiber ring 1061,
The 3rd a length of Fiber3 of single-mode fiber ring 1063, the 4th a length of Fiber4 of single-mode fiber ring 1064, then each several part optical fiber
Length meet following condition:
Fiber3=Fiber2+Fiber4；Ring length=Fiber1+Fiber2+Fiber3.
Illustration length condition: if the long 10km of ring, then the light of 1550nm wave band around line period would be in annular chamber
50us, the scan frequency of tunable optic filter 103 should be 20kHz could realize Fourier locked mode FDML；If waveguide
Tuning range is 50nm, and the three dB bandwidth of tunable optic filter 103 is 0.1nm, then can equally think each humorous
Time of staying at wavelength of shaking is 0.1nm/50nm/20kHz=0.1us, then just require Rayleigh scattering medium height Rayleigh scattering light
The back-scattering light round-trip delay difference at fine ring 1062 two ends is less than 0.1us, so, high Rayleigh scattering optical fiber ring 1062
Length is necessarily less than 10m；If annular chamber increases, then tunable optic filter 103 tuned frequency will reduce, and high Rayleigh dissipates
Penetrate fiber optic loop 1062 suitably to lengthen.
(4) debugging of super-narrow line width FDML laser instrument
The debugging efforts of super-narrow line width FDML Optical Maser System specifically includes that the driving of semiconductor optical amplifier SOA 101
Debugging with control system；The driving of tunable optic filter 103 is debugged with control system；Rayleigh scattering medium or optical fiber structure
Debugging (scattering coefficient, length etc.)；The regulation of Polarization Controller；The regulation of coupler 104 splitting ratio；Annular chamber is long
Degree regulation and dispersion management；The monitoring of laser output wavelength and demarcation etc..After debugging, determine super-narrow line width FDML
Each optical device parameter in Optical Maser System, drive circuitry parameter etc..
(5) realization of super-narrow line width FDML laser instrument
Super-narrow line width FDML ring laser system diagram based on SOA is as shown in Figure 3.Because laser is defeated in annular chamber
Going out big by polarization impact with resonance, in super-narrow line width FDML ring laser based on SOA, the control of polarization state has
Significance, so add the first Polarization Controller 1081 and the second polarizer 1082 realizes on the basis of Fig. 2 scheme
Control to super-narrow line width FDML ring laser polarization state based on SOA.
Super-narrow line width Fourier mode-locked laser based on semiconductor optical amplifier SOA, by semiconductor optical amplifier SOA
101, first optoisolator the 1021, second optoisolator 1022, tunable optic filter the 103, first coupler 1041,
Two couplers 1042, feedback loop, second coupler the 1042, first single-mode fiber 1061 ring one annular chamber of composition, wherein:
Feedback loop includes: optical circulator 105, high Rayleigh scattering optical fiber ring 1062, tunable attenuator VOA the 107, the 3rd single mode
Fiber optic loop the 1063, first Polarization Controller the 1081, the 4th single-mode fiber ring the 1064, second Polarization Controller 1082.
Semiconductor optical amplifier SOA 101, as the spontaneous radiation source of optic fiber ring-shaped cavity scan laser and amplifying device, passes through
The spontaneous radiation of semiconductor optical amplifier SOA 101 makes laser instrument there is spontaneous radiation source, and every sub-beams is through semiconductor light
During amplifier SOA 101, can be amplified by semiconductor optical amplifier SOA 101.For making semiconductor optical amplifier SOA 101
Spontaneous emission light along the direction transmission of regulation, the one-way transmission of light path is main by being positioned at semiconductor optical amplifier SOA
First optoisolator 1021 at 101 two ends and the first optoisolator 1022 realize.Unidirectional light beam after amplification is transferred to can
Tuning filtering device 103, make under the effect of drive circuit 1031 tunable optic filter 103 can according to design sweep speed
Require to select wavelength on a large scale, it is achieved the filtering to light beam.
Filtered light beam arrives the first coupler 1041, a part of light beam the first port A by the first coupler 1041
Output, another part light beam is exported by the second port B of the first coupler 1041, arrives the ring of light through reserved port H1
First port C of shape device 105.The light beam entering into optical circulator 105 is exported by its second port D.The output of D port
Light beam, a part arrives high Rayleigh scattering optical fiber ring 1062 and produces back rayleigh scattering light, and another part continues transmission and arrives
Tunable attenuator VOA 107 forms Straight-Through Beam.Straight-Through Beam is single through tunable attenuator VOA 107 and the 3rd
Mode fiber ring 1063 conveying arrives the first port F of the second coupler 1042, high Rayleigh scattering optical fiber ring 1062 and single-mode optics
Fine ring 1063 is primarily to strengthen the generation of Rayleigh scattering, and tunable attenuator VOA 107 is mainly for controlling through single
The intensity of the light of mode fiber ring 1063, and then control Rayleigh scattering light and straight-through light intensity in annular chamber, pass through
Regulating tunable attenuator VOA 107 makes back rayleigh scattering light compress the bandwidth of laser beam in annular chamber further,
Realize narrow-linewidth laser output eventually.Described back rayleigh scattering light returns to the second port D of optical circulator 105 and enters the ring of light
Shape device 105, and by the 3rd port E output of optical circulator 105, sequentially pass through the second Polarization Controller the 1082, the 4th single
Mode fiber ring the 1064, first Polarization Controller 1081 arrives the second port G of the second coupler 1042.Second coupler 1042
Achieve the conjunction bundle of two-beam.Close the laser after bundle by the second coupler 1042 through reserved port H2 be connected to the first light every
From device 1021, it is achieved loop.
Laser output power is had a great impact by the fiber coupler of different splitting ratios, and meanwhile, it is for endovenous laser
Resonance also important.Length according to annular chamber inner fiber and experimental result, the optimal splitting ratio of selection, the
The splitting ratio of one coupler 1041 is set to 30:70, and the splitting ratio of the second coupler 1042 is set to 50:50.
Reserved port H1, H2 are all connected by FC/APC, are all to be connected by welding between remaining device, and this is main
If in order to reduce the loss effect in end face reflection and chamber.By the attachment structure of different modes, it is possible to achieve different merits
Energy；Such as, if two ports are only connected by optical fiber, the merit of a length scanning optical fiber laser can thus be realized
Energy.
Light beam repeatedly resonance in whole annular chamber, due to the gain of semiconductor optical amplifier SOA 101, and Rayleigh scattering
Feedback effect, finally realize super-narrow line width Fourier locked mode FDML laser output.Scanning through adjustable of wavelength
The modulation of humorous wave filter 103 realizes.By regulating the parameter of scan laser, it is possible to obtain ultra-narrow line based on SOA
Laser spectrum during wide FDML ring laser output continuous wavelength as shown in Figure 4, drives tunable optic filter 103 to be produced
Raw triangle wave voltage signal is as shown in Figure 5.
Above-described detailed description of the invention, has been carried out the purpose of the present invention, technical scheme and beneficial effect the most in detail
Illustrate, be it should be understood that the detailed description of the invention that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should wrap
Within being contained in protection scope of the present invention.
Claims (9)
1. a super-narrow line width Fourier mode-locking ring laser based on semiconductor optical amplifier, it is characterised in that institute
State super-narrow line width Fourier mode-locking ring laser based on semiconductor optical amplifier by optoisolator, semiconductor optical amplification
Device, tunable optic filter, the first coupler, feedback loop, the second coupler, first single-mode fiber ring one annular chamber of composition,
Wherein:
Described optoisolator is provided with the first optoisolator and the second optoisolator, described first optoisolator and described second light
Isolator arranges the two ends being positioned at described semiconductor optical amplifier, is used for making light beam one-way transmission；
Described feedback loop includes: optical circulator, high Rayleigh scattering optical fiber ring, tunable attenuator, the 3rd single-mode fiber ring,
First Polarization Controller, the 4th single-mode fiber ring, the second Polarization Controller；
Light beam is by described first coupler output, and enters into described optical circulator by the first port of described optical circulator；
Entering the light beam second port output by described optical circulator of described optical circulator, a part of light beam arrives described high Rayleigh and dissipates
Penetrating fiber optic loop and produce back rayleigh scattering light, another part light beam continues the transmission described tunable attenuator of arrival and forms straight-through light
Bundle；Described Straight-Through Beam is transported to the first port of described second coupler through tuning and described 3rd single-mode fiber ring；
Described back rayleigh scattering light returns to the second port of described optical circulator and enters described optical circulator, and by described light annular
3rd port output of device, sequentially passes through described second Polarization Controller, described 4th single-mode fiber ring, described first polarization
Export after second port ECDC bundle of controller described second coupler of arrival.
2. super-narrow line width Fourier mode-locking ring laser based on semiconductor optical amplifier as claimed in claim 1, its
Being characterised by, described semiconductor optical amplifier makes described super-narrow line width Fu based on semiconductor optical amplifier by spontaneous radiation
In leaf territory mode-locking ring laser there is spontaneous radiation source, every sub-beams through described semiconductor optical amplifier be exaggerated, with
Realize stimulated radiation and produce laser.
3. super-narrow line width Fourier mode-locking ring laser based on semiconductor optical amplifier as claimed in claim 1, its
Being characterised by, the carrier recovery time of described semiconductor optical amplifier is 300ps.
4. super-narrow line width Fourier mode-locking ring laser based on semiconductor optical amplifier as claimed in claim 1, its
Being characterised by, described annular chamber reserves two ports, and port type is set to annular connector FC/ dimpling polishing connector
APC, is connected by the method for welding between remaining element.
5. super-narrow line width Fourier mode-locking ring laser based on semiconductor optical amplifier as claimed in claim 1, its
It is characterised by, selects the optimal of described first coupler and described second coupler according to the length of described annular chamber inner fiber
Splitting ratio；The splitting ratio of described first coupler is set to 30:70, and the splitting ratio of described second coupler is set to 50:50.
6. super-narrow line width Fourier mode-locking ring laser based on semiconductor optical amplifier as claimed in claim 1, its
Being characterised by, described tunable optic filter requires to select wavelength according to design sweep speed, to realize filtering.
7. super-narrow line width Fourier mode-locking ring laser based on semiconductor optical amplifier as claimed in claim 1, its
Being characterised by, the drive circuit of described semiconductor optical amplifier and described tunable optic filter is by based on FPGA Direct Digital frequency
Rate synthesis realizes.
8. super-narrow line width Fourier mode-locking ring laser based on semiconductor optical amplifier as claimed in claim 1, its
Being characterised by, described adjustable attenuator controls described back rayleigh scattering light and described Straight-Through Beam ratio in ring so that
The bandwidth of light beam in described annular chamber is compressed by described back rayleigh scattering light further, finally realizes narrow-linewidth laser output.
9. super-narrow line width Fourier mode-locking ring laser based on semiconductor optical amplifier as claimed in claim 1, its
It is characterised by, if whole fiber lengths is set to ring length, a length of Fiber2 of described high Rayleigh scattering optical fiber ring, institute
State the first single-mode fiber ring length be Fiber1, described 3rd single-mode fiber ring length be Fiber3, described 4th single-mode fiber
Ring length is Fiber4, then the length of each several part optical fiber meets following condition:
Fiber3=Fiber2+Fiber4；Ring length=Fiber1+Fiber2+Fiber3.
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| CN104143757B (en) * | 2014-08-07 | 2017-03-08 | 中国科学院半导体研究所 | Tunable wave length narrow linewidth light source based on distributed Bragg reflection laser |
| CN106207724B (en) * | 2016-08-31 | 2018-10-09 | 暨南大学 | A kind of tunable single-frequency optical fiber laser and its implementation |
| CN106785860A (en) * | 2016-12-09 | 2017-05-31 | 清华大学 | Self-stabilising frequency domain mode-locked laser based on frequency self-reaction |
| CN106684679B (en) * | 2017-02-28 | 2020-01-21 | 中国科学院国家授时中心 | All-fiber narrow-linewidth fiber laser device and method for optical frequency transmission |
| CN109412007B (en) * | 2017-08-18 | 2020-03-17 | 香港理工大学深圳研究院 | Fourier mode-locked laser |
| CN109506788A (en) * | 2018-11-01 | 2019-03-22 | 中国科学院半导体研究所 | Optical wavelength measurement system based on Fourier's mode-locked laser |
| CN110448271A (en) * | 2018-12-28 | 2019-11-15 | 中国科学院宁波工业技术研究院慈溪生物医学工程研究所 | θ chamber Fourier locks film swept light source system and OCT image system |
| CN110275292B (en) * | 2019-06-21 | 2021-09-07 | 上海电力学院 | Drive voltage optimization method for tunable Fabry-Perot filter |
| CN110649452A (en) * | 2019-09-27 | 2020-01-03 | 北京航空航天大学 | High-power wavelength-adjustable all-fiber nanosecond pulse laser and system |
| CN112858247A (en) * | 2021-03-22 | 2021-05-28 | 广东粤港澳大湾区协同创新研究院 | Excitation light source of multi-color microscope |
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