CN108254992A - A kind of pulse light generating device and method - Google Patents
A kind of pulse light generating device and method Download PDFInfo
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- CN108254992A CN108254992A CN201611234689.XA CN201611234689A CN108254992A CN 108254992 A CN108254992 A CN 108254992A CN 201611234689 A CN201611234689 A CN 201611234689A CN 108254992 A CN108254992 A CN 108254992A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/508—Pulse generation, e.g. generation of solitons
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Abstract
The present invention provides a kind of pulse light generating device and method, wherein, the pulse light generating device includes：Pulsed light to be modulated generates unit, for generating the pulsed light to be modulated being widened through nonlinear spectral, spatial light modulator, for according to amplitude modulation function, modulate the spectral intensity of the pulsed light to be modulated, according to phase modulation function, modulate the time domain intensity of the pulsed light to be modulated, and export modulation pulsed light, self feed back control unit, the input, output end of the self feed back control unit is connect with the spatial light modulator, for according to target pulse light and the modulation pulsed light, reseting the amplitude modulation function and phase modulation function.The solution of the present invention, it can be based on self feed back and target pulse light, to the modulation through the pulsed light that nonlinear spectral is widened into line amplitude and phase, so that modulated pulsed light and target pulse light infinite approach, the process of the amplitude of simplification and phase-modulation realizes the Automatic Optimal of impulse waveform and high quality output.
Description
Technical field
The present invention relates to laser technology field more particularly to a kind of pulse light generating device and methods.
Background technology
Ultrashort pulse light generating device is Optical Time Division Multiplexing (Optical Time-Division Multiplexing, letter
Claim OTDM) basis of system, performance determines the transmission rate and stability of OTDM systems.At present, ultrashort pulse light generates
Device mainly includes mode-locked laser and the ultrashort pulse light generating device based on direct current light external modulation.
Wherein, the ultrashort pulse light generating device based on direct current light external modulation is will to be injected by the direct current light of laser emitting
Modulator (such as 3 phase-modulators and 1 mach zhender intensity modulator) after the modulation of modulated device, directly generates
Ultrashort pulse light.In order to meet requirement of the higher rate OTDM systems to pulsed light, currently have proposed and be widened based on nonlinear spectral
Ultrashort pulse light generate scheme.For example, the seed arteries and veins that the ultrashort pulse light generating device based on direct current light external modulation is generated
Injection highly nonlinear optical fiber (Highly Non-Linear Fiber, abbreviation HNLF) is washed off, by the Self-phase modulation in HNLF
Etc. nonlinear effects, realize the very big broadening of spectrum.
In scheme based on nonlinear spectral broadening, the work of the nonlinear effects such as the Self-phase modulation of seed pulse light through HNLF
With rear, spectrum can significantly be widened, but pulsed light generally has apparent pedestal.In order to optimize the pulse being widened through nonlinear spectral
Spatial light modulator (Spatial Light Modulator, abbreviation SLM) usually can be used to the width of every spectral line of spectrum in light
Degree and phase are modulated.It realizes, but in phase-modulation, is needed every spectrum using in the scheme of SLM, amplitude modulation is relatively easy
To linear phase, operation difficulty is very big for nonlinear Phase Modulation between line.
Invention content
The purpose of the present invention is to provide a kind of pulse light generating device and method, to solve existing optimization through non-linear
Amplitude and the problem of big phase modulation operations difficulty during the pulsed light of spectrum widening.
In order to realize above-mentioned purpose, on the one hand, the present invention provides a kind of pulse light generating device, including：
Pulsed light to be modulated generates unit, for generating the pulsed light to be modulated being widened through nonlinear spectral；
Spatial light modulator, the input terminal of the spatial light modulator generate the output of unit with the pulsed light to be modulated
End connects, and has variable amplitude modulation function and phase modulation function in the spatial light modulator, for according to the width
Modulation function is spent, modulates the spectral intensity of the pulsed light to be modulated, according to the phase modulation function, modulation is described to be modulated
The time domain intensity of pulsed light, and export modulation pulsed light；
Self feed back control unit, the input terminal of the self feed back control unit connect with the output terminal of the spatial light modulator
It connects, the output terminal of the self feed back control unit is connect with the input terminal of the spatial light modulator, for according to target pulse
Light and the modulation pulsed light, reset the amplitude modulation function and phase modulation function so that the spatial light modulator is defeated
The modulation pulsed light gone out is close to the target pulse light.
Preferably, the self feed back control unit includes：
Spectral sample unit, the input terminal of the spectral sample unit are connect with the output terminal of the spatial light modulator,
For measuring the spectral intensity of the modulation pulsed light；
Time-domain sampling unit, the input terminal of the time-domain sampling unit are connect with the output terminal of the spatial light modulator,
For measuring the time domain intensity of the modulation pulsed light；
Algorithm process unit, the input terminal of the algorithm process unit are connect with the output terminal of the spectral sample unit,
The output terminal of the algorithm process unit is connect with the input terminal of the spatial light modulator, for calculating the spectral sample list
First difference of the spectral intensity that member measures and the spectral intensity of the target pulse light, according to being reseted first difference
Amplitude modulation function so that the spectral intensity for modulating pulsed light and the target modulated according to the amplitude modulation function after reseting
The spectral intensity of pulsed light is consistent；
Output terminal of the input terminal of the algorithm process unit also with the time-domain sampling unit is connect, described for calculating
Second difference of the time domain intensity that time-domain sampling unit measures and the time domain intensity of the target pulse light, it is poor according to described second
Value resets the phase modulation function so that the time domain intensity of modulation pulsed light modulated according to the phase modulation function after reseting
It is less than a predetermined threshold value with the difference of the time domain intensity of the target pulse light.
Preferably, the initial setting of the amplitude modulation function is 0, described to reset the width according to first difference
Spending modulation function is specially：
The amplitude modulation function is set as first difference.
Preferably, it is described the phase modulation function is reseted according to second difference to be specially：
According to second difference, using evolution strategy algorithm, optimize the phase modulation function.
Preferably, second difference is the time domain intensity that the time-domain sampling unit measures and the target pulse light
The normalization difference of time domain intensity.
Preferably, the pulsed light to be modulated generates unit and includes：
Pulse laser, for generating direct current light；
Phase modulation unit, the input terminal of the phase modulation unit is respectively with the output terminal of the pulse laser and penetrating
Frequency source connects, and for the radio frequency signals drive generated through the radio frequency source, carries out phase-modulation to the direct current light, obtains chirp
Direct current light；
Dispersive medium, the input terminal of the dispersive medium are connect with the output terminal of the phase modulation unit, for institute
It states chirp direct current light and carries out linear chrip compensation, obtain seed pulse light；
High-power fiber amplifier, the input terminal of the high-power fiber amplifier and the output terminal of the dispersive medium connect
It connects, for carrying out power amplification to the seed pulse light；
Highly nonlinear optical fiber, the input terminal of the highly nonlinear optical fiber and the output terminal of the high-power fiber amplifier connect
It connects, for carrying out Self-phase modulation to the seed pulse light after power amplification, obtains being widened through nonlinear spectral described to be modulated
Pulsed light.
Preferably, the target pulse light is Gaussian-shaped pulse light.
On the other hand, the present invention also provides a kind of pulsed light production method, including：
Generate the pulsed light to be modulated being widened through nonlinear spectral；
By spatial light modulator according to amplitude modulation function, the spectral intensity of the pulsed light to be modulated is modulated, according to
Phase modulation function, modulates the time domain intensity of the pulsed light to be modulated, and exports modulation pulsed light；
According to target pulse light and the modulation pulsed light, the amplitude modulation function and phase modulation function are reseted, is made
Spatial light modulator output modulation pulsed light close to the target pulse light.
Preferably, it is described according to target pulse light and the modulation pulsed light, reset the amplitude modulation function and phase
Modulation function so that the modulation pulsed light of spatial light modulator output close to the target pulse light step, including：
The spectral intensity of the modulation pulsed light is measured by spectral sample unit, by described in the calculating of algorithm process unit
First difference of the spectral intensity that spectral sample unit measures and the spectral intensity of the target pulse light, it is poor according to described first
Value resets the amplitude modulation function so that the spectral intensity of modulation pulsed light modulated according to the amplitude modulation function after reseting
It is consistent with the spectral intensity of the target pulse light；
The time domain intensity of the modulation pulsed light is measured by time-domain sampling unit, is calculated by the algorithm process unit
Second difference of the time domain intensity that the time-domain sampling unit measures and the time domain intensity of the target pulse light, according to described the
Two differences using evolution strategy algorithm, optimize the phase modulation function so that are modulated according to the phase modulation function after optimization
The difference of time domain intensity of time domain intensity and the target pulse light of modulation pulsed light be less than a predetermined threshold value.
Preferably, the step of generation pulsed light to be modulated, including：
Generate direct current light；
Through radio frequency signals drive, phase-modulation is carried out to the direct current light, obtains chirp direct current light；
Linear chrip compensation is carried out to the chirp direct current light, obtains seed pulse light；
Power amplification is carried out to the seed pulse light；
Self-phase modulation is carried out to the seed pulse light after power amplification, obtains being widened through nonlinear spectral described to be modulated
Pulsed light.
The pulse light generating device of the present invention generates unit, spatial light modulator and self feed back by pulsed light to be modulated
Control unit can be based on self feed back and target pulse light, to through the pulsed light that nonlinear spectral is widened into line amplitude and phase
Modulation so that modulated pulsed light and target pulse light infinite approach simplify amplitude and the process of phase-modulation, realize pulse
Automatic Optimal and the high quality output of waveform.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, it will make below to required in the embodiment of the present invention
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for
For those of ordinary skill in the art, without having to pay creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 shows the pulse light generating device structure diagrams of first embodiment of the invention.
Fig. 2 represents the pulse light generating device structure diagram of the specific embodiment of the invention.
During Fig. 3 (a)~Fig. 3 (g) represents that the pulse light generating device of the specific embodiment of the invention generates pulsed light
Correlogram.
Fig. 4 represents the flow chart of the pulsed light production method of second embodiment of the invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is part of the embodiment of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
First embodiment
Shown in Figure 1, first embodiment of the invention provides a kind of pulse light generating device, is produced including pulsed light to be modulated
Raw unit 11, spatial light modulator 12 and self feed back control unit 13, details are as follows.
Wherein, which generates unit 11 for generating the pulsed light to be modulated being widened through nonlinear spectral.
The input terminal of the spatial light modulator 12 is connect with the output terminal that the pulsed light to be modulated generates unit 11, the space
There is variable amplitude modulation function and phase modulation function, for according to the amplitude modulation function, modulation in optical modulator 12
The spectral intensity of the pulsed light to be modulated according to the phase modulation function, modulates the time domain intensity of the pulsed light to be modulated, and defeated
Go out to modulate pulsed light.Wherein, when being modulated to the pulsed light to be modulated, amplitude and phase can be modulated simultaneously, also may be used
First amplitude is modulated, then phase is modulated.
The input terminal of the self feed back control unit 13 is connect with the output terminal of the spatial light modulator 12, and the self feed back control
The output terminal of unit 13 processed is connect with the input terminal of the spatial light modulator 12, for receiving the modulation pulsed light, according to target
Pulsed light and the modulation pulsed light, reset the amplitude modulation function and phase modulation function so that the spatial light modulator 12 is defeated
The modulation pulsed light gone out is close to the target pulse light.Wherein, it is provided with the target pulse light in the self feed back control unit 13.
Specifically, shown in Figure 2, which, which generates unit 11, may include pulse laser 111, phase tune
Unit 112 processed, dispersive medium 113, high-power fiber amplifier 114 and highly nonlinear optical fiber 115, details are as follows.
Wherein, which is used to generate direct current light.In practical application, which, which can be selected, divides
Cloth feeds back (Distributed Feedback, abbreviation DFB) laser.
The input terminal of the phase modulation unit 112 connects respectively with the output terminal of the pulse laser 111 and radio frequency source 116
It connects, for receiving the direct current light of the pulse laser 111 output, the radio frequency signals drive through the radio frequency source 116 generation is straight to this
Streamer carries out phase-modulation, obtains chirp direct current light.Wherein, which can be cosine radiofrequency signal, and more than direct current light warp
After the phase-modulation of string radio frequency signals drive, iwth sine chirp, spectrum widening can be loaded.
The input terminal of the dispersive medium 113 is connect with the output terminal of the phase modulation unit 112, for receiving the phase tune
The chirp direct current light that unit 112 processed exports carries out linear chrip compensation to the chirp direct current light, obtains seed pulse light.Wherein,
For the chirp direct current light after the effect of dispersive medium, just (or negative) chirp part of iwth sine chirp can be by the linear Zhou of dispersive medium
It sings compensation, phase-modulation is converted into intensity modulated, generates the seed pulse light with apparent pedestal.The dispersive medium may be used
Dispersion compensating fiber (Dispersion Compensated Fiber, abbreviation DCF), single mode optical fiber (Single-Mode
Fiber, abbreviation SMF), fiber bragg grating (Fibber Bragg Grating, abbreviation FBG) etc..
The input terminal of the high-power fiber amplifier 114 is connect with the output terminal of the dispersive medium 113, for receiving the color
The seed pulse light that dispersion media 113 exports carries out power amplification to the seed pulse light.
The input terminal of the highly nonlinear optical fiber 115 is connect with the output terminal of the high-power fiber amplifier 114, for receiving
The seed pulse light of the high-power fiber amplifier 114 output, carries out from phase tune the seed pulse light after power amplification
System, obtains the pulsed light to be modulated being widened through nonlinear spectral.Specifically, the seed pulse light injection high non-linearity after power amplification
After optical fiber 115, it can be achieved that the very big broadening of spectrum under the action of the nonlinear effects such as Self-phase modulation.
It should be pointed out that specific implementation when, the pulse laser 111, phase modulation unit 112, dispersive medium 113,
High-power fiber amplifier 114 is connected with highly nonlinear optical fiber 115 using optics successively, the phase modulation unit 112 and radio frequency
Source 116 is using being electrically connected.
Specifically, shown in Figure 2, which may include spectral sample unit 131, time-domain sampling list
Member 132 and algorithm process unit 133, details are as follows.
Wherein, the input terminal of the spectral sample unit 131 is connect with the output terminal of the spatial light modulator 12, for receiving
Pulsed light is modulated, and measures the spectral intensity of the modulation pulsed light.
The input terminal of the time-domain sampling unit 132 is connect with the output terminal of the spatial light modulator 12, is modulated for receiving
Pulsed light, and measure the time domain intensity of the modulation pulsed light.
The input terminal of the algorithm process unit 133 is connect with the output terminal of the spectral sample unit 131, the algorithm process list
The output terminal of member 133 is connect with the input terminal of the spatial light modulator 12.Target pulse is provided in the algorithm process unit 133
Light.
Specifically, the algorithm process unit 133 is available for calculating the spectral intensity of the spectral sample unit 131 measurement (i.e.
Modulate the spectral intensity of pulsed light) the first difference with the spectral intensity of the target pulse light, this is reseted according to first difference
Amplitude modulation function in spatial light modulator 12 so that the modulation pulsed light modulated according to the amplitude modulation function after reseting
Spectral intensity is consistent with the spectral intensity of the target pulse light.
And when the initial setting of the amplitude modulation function is 0, which is reseted according to first difference
Mode can be：The amplitude modulation function is set as first difference.
In this way, due to reseting amplitude modulation function using the first difference of feedback, thus can simple realization according to reseting after
Amplitude modulation function pulsed light to be modulated is modulated after pulsed light spectral intensity, meet the spectrum of target pulse light
It is it is required that is, consistent with the spectral intensity of target pulse light.
In addition, output terminal of the input terminal of the algorithm process unit 133 also with the time-domain sampling unit 132 is connect, it is used for
Calculate the time domain intensity time domain intensity of pulsed light (modulate) of the time-domain sampling unit 132 measurement and the target pulse light when
Second difference of domain intensity resets the phase modulation function in the spatial light modulator 12 according to second difference so that according to
The difference of the time domain intensity and the time domain intensity of the target pulse light of the modulation pulsed light of phase modulation function modulation after reseting
Less than a predetermined threshold value.
And the mode that the phase modulation function is reseted according to second difference can be：According to second difference, will this
Two differences, using evolution strategy algorithm, optimize the phase modulation function as feedback signal so that according to the phase tune after optimization
The time domain intensity of modulation pulsed light of FUNCTION MODULATION processed is less than a predetermined threshold value with the difference of the time domain intensity of the target pulse light.
Wherein, the initial setting of the phase modulation function can be 0.The predetermined threshold value can be preset according to actual conditions, the present invention
It is not limited.
Due to the difference that second difference is the time domain intensity and the time domain intensity of target pulse light of modulating pulsed light, so
During using evolution strategy algorithm, using second difference as feedback signal, it can accelerate to optimize the process of phase modulation function.
Specifically, second difference, which can be the time domain intensity that the time-domain sampling unit measures, (modulates the time domain of pulsed light
Intensity) normalization difference with the time domain intensity of the target pulse light.
The representation of the normalization difference is：
Wherein, | UWaveform(t)|2Represent the performance number of the modulation pulsed light of the phase modulated FUNCTION MODULATION of moment t, |
uWaveform(t)|2Represent the performance number of the target pulse light of moment t, ∫ | uWaveform(t)|2Dt represents the time domain of target pulse light
Intensity, ∫ | UWaveform(t)|2Dt represents the time domain intensity of the modulation pulsed light of phase modulated FUNCTION MODULATION.
In this way, due to the second difference using feedback, using evolution strategy algorithm, phase modulation function is continued to optimize, institute
With can simple realization pulsed light to be modulated is modulated according to the phase modulation function after optimization after pulsed light time domain it is strong
Degree meets the time domain critical of target pulse light.
It should be pointed out that during specific implementation, the spatial light modulator 12 and the spectral sample unit 131 and time-domain sampling
Unit 132 is connected using optics, and the spatial light modulator 12, spectral sample unit 131 and time-domain sampling unit 132 are with being somebody's turn to do
Algorithm process unit 133 is using being electrically connected.
In the specific embodiment of the invention, which can be Gaussian-shaped pulse light.In this way, the specific embodiment of the invention
Pulse light generating device, can generate closely without chirp Gaussian ultrashort pulse light.
In the following, pulsed light is generated to the pulse light generating device of the specific embodiment of the invention with reference to Fig. 3 (a)~Fig. 3 (g)
Process illustrates.
In the specific embodiment of the invention, the nearly no chirp Gaussian that duty ratio is~2%, extinction ratio for~28dB can be generated
Ultrashort pulse light disclosure satisfy that requirement of 16 × 25-Gb/s OTDM systems to light source.
Wherein, Distributed Feedback Laser outgoing direct current light, the wherein a length of 1550.1nm of cardiac wave.Phase modulation unit PM is by 25-GHz
Sinusoidal radio frequency signal drives, and phase modulation coefficient is~0.9 π.Dispersive medium uses SMF, the length of 1km.Direct current light is noted
Enter the seed pulse generator being made of PM and SMF, generate chirp seed pulse light of the full width at half maximum for~4ps.The chirp kind
Subpulse light is amplified to through high-power fiber amplifier~23dBm after inject HNLF.The length of HNLF is 1km, nonlinear factor
It is -1.7ps/nm/km for the dispersion values at 18/W/km, 1550nm, chromatic dispersion gradient 0.0023ps/nm2/km.Due in HNLF
Self phase modulation, pulse spectrum is significantly widened, as shown in Fig. 3 (a).As a comparison, first only in the pulse spectrum
77 spectral lines of the heart are modulated into line amplitude, its spectral envelope is made to meet gaussian shape.The amplitude modulation that Fig. 3 (b) is programmable SLM
Function, Fig. 3 (c) are through the modulated pulse spectrum of SLM amplitudes, and wherein spectral envelope is Gauss curve fitting curve, and Fig. 3 (d) is warp
The modulated waveform of SLM amplitudes, wherein including chirp, that is, dotted portion.The pulse spectrum and waveform of SLM output terminals are respectively by frequency
Compose sampling unit, time-domain sampling unit measures.It can see from Fig. 3 (c) and Fig. 3 (d), although pulse spectrum has met reason
The gaussian shape thought, but its waveform has apparent pedestal and substrate, and with larger non-linear chirp.At this point, pulse
Extinction ratio be only~14dB.In order to improve pulse quality and compensating non-linear chirp, phase-modulation is carried out to every spectral line.
In the specific embodiment of the invention, using (μ+λ)-evolution strategy, the phase modulation function of programmable SLM is controlled.It is first
First, according to specific requirement, target pulse light is set.Gaussian spectrum shown in Fig. 3 (c) is through Fourier inversion, in no chirp
In the case of, time domain waveform should be overlapped with Gaussian curve of the full width at half maximum for~0.8ps, and therefore, which is target
The time domain intensity of pulsed light.It is measured through the modulated impulse waveforms of SLM by time-domain sampling unit, measures the time domain intensity of pulsed light
Normalization difference with the time domain intensity of target pulse light uses phase of (μ+the λ)-evolution strategy to SLM as feedback signal
Position modulation function optimizes.To reduce algorithm complexity and improving efficiency of algorithm, (μ+λ)-evolution strategy is as follows using parameter：
μ=1, λ=1, evolution number are 10, optimized coefficients 0.85, and the frequency comb number of SLM controls is 77, when normalization difference
During less than 0.1, optimization terminates.As shown in Fig. 3 (e), through iteration 1389 times, optimization terminates, generate full width at half maximum for~0.8ps,
Gaussian pulse of the extinction ratio for~28dB, wherein for Gauss curve fitting curve, the time-bandwidth product of the pulse is~0.45.Fig. 3 (f)
It may be programmed the phase modulation function of SLM at the end of for iteration.Closely adjusted without chirp Gaussian ultrashort pulse light through on-off keying (OOK)
After system and 1 × 16 passive optical time division multiplexer multiplexing, shown in eye pattern such as Fig. 3 (g).From Fig. 3 (g) it is found that the 16 × 25-Gb/s
OTDM-OOK signals have clearly eye opening in the time domain without intersymbol interference.
The pulse light generating device of first embodiment of the invention generates unit, space light modulation by pulsed light to be modulated
Device and self feed back control unit can be based on self feed back and target pulse light, and width is carried out to the pulsed light being widened through nonlinear spectral
The modulation of degree and phase so that modulated pulsed light and target pulse light infinite approach simplify amplitude and the mistake of phase-modulation
Journey realizes the Automatic Optimal of impulse waveform and high quality output.
Second embodiment
Shown in Figure 4, second embodiment of the invention provides a kind of pulse light modulating method, includes the following steps：
Step 401：Generate the pulsed light to be modulated being widened through nonlinear spectral；
Step 402：By spatial light modulator according to amplitude modulation function, the spectrum for modulating the pulsed light to be modulated is strong
Degree according to phase modulation function, modulates the time domain intensity of the pulsed light to be modulated, and exports modulation pulsed light；
Step 403：According to target pulse light and the modulation pulsed light, the amplitude modulation function and phase-modulation are reseted
Function so that the modulation pulsed light of spatial light modulator output is close to the target pulse light.
In the specific embodiment of the invention, the step of pulsed light to be modulated which is widened through nonlinear spectral, can be specially：
Generate direct current light；
Through radio frequency signals drive, phase-modulation is carried out to the direct current light, obtains chirp direct current light；
Linear chrip compensation is carried out to the chirp direct current light, obtains seed pulse light；
Power amplification is carried out to the seed pulse light；
Self-phase modulation is carried out to the seed pulse light after power amplification, is obtained through being treated described in nonlinear spectral broadening
Modulate pulsed light.
Specifically, this resets the amplitude modulation function and phase tune according to target pulse light and the modulation pulsed light
Function processed so that the step of modulation pulsed light close to the target pulse light of spatial light modulator output can be：
The spectral intensity of the modulation pulsed light is measured by spectral sample unit, by described in the calculating of algorithm process unit
First difference of the spectral intensity that spectral sample unit measures and the spectral intensity of the target pulse light, it is poor according to described first
Value resets the amplitude modulation function so that the spectral intensity of modulation pulsed light modulated according to the amplitude modulation function after reseting
It is consistent with the spectral intensity of the target pulse light；
The time domain intensity of the modulation pulsed light is measured by time-domain sampling unit, is calculated by the algorithm process unit
Second difference of the time domain intensity that the time-domain sampling unit measures and the time domain intensity of the target pulse light, according to described the
Two differences using evolution strategy algorithm, optimize the phase modulation function so that are modulated according to the phase modulation function after optimization
The difference of time domain intensity of time domain intensity and the target pulse light of modulation pulsed light be less than a predetermined threshold value.
The pulsed light production method of second embodiment of the invention can be based on self feed back and target pulse light, to through non-thread
Property spectrum widening pulsed light into line amplitude and phase modulation so that modulated pulsed light and target pulse light infinite approach,
The process of the amplitude of simplification and phase-modulation realizes the Automatic Optimal of impulse waveform and high quality output.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of pulse light generating device, which is characterized in that including：
Pulsed light to be modulated generates unit, for generating the pulsed light to be modulated being widened through nonlinear spectral；
Spatial light modulator, the output terminal that the input terminal of the spatial light modulator generates unit with the pulsed light to be modulated connect
It connects, there is variable amplitude modulation function and phase modulation function, for according to the amplitude tune in the spatial light modulator
Function processed modulates the spectral intensity of the pulsed light to be modulated, according to the phase modulation function, modulates the pulse to be modulated
The time domain intensity of light, and export modulation pulsed light；
Self feed back control unit, the input terminal of the self feed back control unit are connect with the output terminal of the spatial light modulator,
The output terminal of the self feed back control unit is connect with the input terminal of the spatial light modulator, for according to target pulse light and
The modulation pulsed light resets the amplitude modulation function and phase modulation function so that the spatial light modulator output
Pulsed light is modulated close to the target pulse light.
2. pulse light generating device according to claim 1, which is characterized in that the self feed back control unit includes：
Spectral sample unit, the input terminal of the spectral sample unit connect with the output terminal of the spatial light modulator, are used for
Measure the spectral intensity of the modulation pulsed light；
Time-domain sampling unit, the input terminal of the time-domain sampling unit connect with the output terminal of the spatial light modulator, are used for
Measure the time domain intensity of the modulation pulsed light；
Algorithm process unit, the input terminal of the algorithm process unit is connect with the output terminal of the spectral sample unit, described
The output terminal of algorithm process unit is connect with the input terminal of the spatial light modulator, is surveyed for calculating the spectral sample unit
First difference of the spectral intensity of amount and the spectral intensity of the target pulse light, the amplitude is reseted according to first difference
Modulation function so that the spectral intensity for modulating pulsed light modulated according to the amplitude modulation function after reseting and the target pulse
The spectral intensity of light is consistent；
Output terminal of the input terminal of the algorithm process unit also with the time-domain sampling unit is connect, for calculating the time domain
Second difference of the time domain intensity that sampling unit measures and the time domain intensity of the target pulse light, according to the second difference weight
If the phase modulation function so that the time domain intensity for modulating pulsed light modulated according to the phase modulation function after reseting and institute
The difference for stating the time domain intensity of target pulse light is less than a predetermined threshold value.
3. pulse light generating device according to claim 2, which is characterized in that the initial setting up of the amplitude modulation function
It is 0 to be worth, described to reset the amplitude modulation function according to first difference and be specially：
The amplitude modulation function is set as first difference.
4. pulse light generating device according to claim 2, which is characterized in that described that institute is reseted according to second difference
Stating phase modulation function is specially：
According to second difference, using evolution strategy algorithm, optimize the phase modulation function.
5. pulse light generating device according to claim 4, which is characterized in that second difference is the time-domain sampling
The normalization difference of the time domain intensity that unit measures and the time domain intensity of the target pulse light.
6. pulse light generating device according to claim 1, which is characterized in that the pulsed light to be modulated generates unit packet
It includes：
Pulse laser, for generating direct current light；
Phase modulation unit, the input terminal of the phase modulation unit respectively with the output terminal and radio frequency source of the pulse laser
Connection for the radio frequency signals drive generated through the radio frequency source, carries out phase-modulation to the direct current light, obtains chirp direct current
Light；
Dispersive medium, the input terminal of the dispersive medium are connect with the output terminal of the phase modulation unit, for the Zhou
Direct current light of singing carries out linear chrip compensation, obtains seed pulse light；
High-power fiber amplifier, the input terminal of the high-power fiber amplifier are connect with the output terminal of the dispersive medium,
For carrying out power amplification to the seed pulse light；
Highly nonlinear optical fiber, the input terminal of the highly nonlinear optical fiber are connect with the output terminal of the high-power fiber amplifier,
For carrying out Self-phase modulation to the seed pulse light after power amplification, obtain being widened through nonlinear spectral described to be modulated
Pulsed light.
7. according to the pulse light generating device any in claim 1 to 6, which is characterized in that the target pulse light is
Gaussian-shaped pulse light.
8. a kind of pulsed light production method, which is characterized in that including：
Generate the pulsed light to be modulated being widened through nonlinear spectral；
By spatial light modulator according to amplitude modulation function, the spectral intensity of the pulsed light to be modulated is modulated, according to phase
Modulation function, modulates the time domain intensity of the pulsed light to be modulated, and exports modulation pulsed light；
According to target pulse light and the modulation pulsed light, the amplitude modulation function and phase modulation function are reseted so that institute
The modulation pulsed light of spatial light modulator output is stated close to the target pulse light.
9. pulsed light production method according to claim 8, which is characterized in that described according to target pulse light and the tune
Pulsed light processed resets the amplitude modulation function and phase modulation function so that the modulation arteries and veins of the spatial light modulator output
Wash the step close to the target pulse light off, including：
The spectral intensity of the modulation pulsed light is measured by spectral sample unit, the frequency spectrum is calculated by algorithm process unit
First difference of the spectral intensity that sampling unit measures and the spectral intensity of the target pulse light, according to the first difference weight
If the amplitude modulation function so that the spectral intensity for modulating pulsed light modulated according to the amplitude modulation function after reseting and institute
The spectral intensity for stating target pulse light is consistent；
The time domain intensity of the modulation pulsed light is measured by time-domain sampling unit, by described in algorithm process unit calculating
Second difference of the time domain intensity that time-domain sampling unit measures and the time domain intensity of the target pulse light, it is poor according to described second
Value, using evolution strategy algorithm, optimizes the phase modulation function so that the tune modulated according to the phase modulation function after optimization
The time domain intensity of pulsed light processed and the difference of the time domain intensity of the target pulse light are less than a predetermined threshold value.
10. pulsed light production method according to claim 8, which is characterized in that the step for generating pulsed light to be modulated
Suddenly, including：
Generate direct current light；
Through radio frequency signals drive, phase-modulation is carried out to the direct current light, obtains chirp direct current light；
Linear chrip compensation is carried out to the chirp direct current light, obtains seed pulse light；
Power amplification is carried out to the seed pulse light；
Self-phase modulation is carried out to the seed pulse light after power amplification, obtains being widened through nonlinear spectral described to be modulated
Pulsed light.
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| CN111064067A (en) * | 2019-12-19 | 2020-04-24 | 中国兵器装备研究院 | Optical fiber laser coherent combining system |
| CN113504644A (en) * | 2021-07-21 | 2021-10-15 | 中国工程物理研究院激光聚变研究中心 | Method for inhibiting amplitude frequency effect in high-power laser device |
| US11150536B2 (en) * | 2018-07-26 | 2021-10-19 | S2 Corporation | Techniques for using nonlinear electromagnetic materials to produce arbitrary electromagnetic signals |
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