CN108631144A - A kind of Semiconductor laser device and method - Google Patents
A kind of Semiconductor laser device and method Download PDFInfo
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- CN108631144A CN108631144A CN201710171157.4A CN201710171157A CN108631144A CN 108631144 A CN108631144 A CN 108631144A CN 201710171157 A CN201710171157 A CN 201710171157A CN 108631144 A CN108631144 A CN 108631144A
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- intensity modulator
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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
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10053—Phase control
Abstract
The invention discloses a kind of Semiconductor laser device and method, to solve the problems, such as that the generation scheme of ultrashort pulse existing in the prior art cannot generate ultrashort light pulse of the stable high quality without chirp.An embodiment of the present invention provides a kind of Semiconductor laser equipment, which includes laser generation module, phase modulation module, intensity modulator, filter, compensating module and radio-frequency power supply module；The laser generation module, the phase modulation module, the intensity modulator, the filter and the compensating module are sequentially connected；The radio-frequency power supply module is respectively the phase modulation module and the intensity modulator provides radiofrequency signal, and phase modulation module generates the optical signal of the frequency comb with flat-top with intensity modulator cooperation；Filter carries out light spectrum reshaping to the optical signal that intensity modulator exports；Compensating module can remove linear chrip, it is final generate it is stable without chirped ultra short optical pulse.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of Semiconductor laser device and method.
Background technology
Nineteen sixty-five produces the pulse of picosecond using passive mode-locking ruby laser, later with the development of technology,
Head-on collision mode locking ring dye laser makes pulse perdurabgility shorten to femtosecond rank.In optics, ultrashort light pulse refers to prolonging
The continuous time is in femtosecond (10 minus 15 power second) order of magnitude or shorter electromagnetic pulse.Using ultrashort pulse as light source so that the time
The supper-fast technologies for information acquisition such as resolution spectrum technology, pumping/Detection Techniques have notable development, such as temporal resolution
Fluorescence spectroscopy technique, Molecular dynamics, reflectance spectrum, time-resolved Raman spectro scopy, femtosecond streak camera, full light sampling/electricity
Light sampling and measuring, electric absorption sampling technique etc.；In addition to this, ultrashort pulse also has weight in chemistry, the multiple fields such as biology
The application wanted.
How to generate the preferable ultrashort light pulse of quality is always research hotspot, at present for, generate ultrashort light pulse
Scheme is mainly the following：
1, mode-locked laser generates scheme；Such as high-repetition-rate, low duty can be generated using active mode locking light laser
The light pulse of ratio.But the environmental factors such as vibrations, temperature can influence Active Mode-locked Fiber Laser, when leading to laser works less
Stablize, causes the wavelength of light pulse and phase to generate shake, affect the quality and stability of light pulse.
2, direct current light external modulation generates scheme；Direct current light is injected into modulator and is modulated, light pulse is directly generated.
This scheme is simple and practicable, but the light pulse duty exported is relatively high, has apparent non-linear chirp, second-rate.
3, mode-locked laser/direct current light combination non-linear compression grade generates scheme；Mode-locked laser or direct current light are transferred
The seed optical pulse that system generates is injected into the non-linear compression grade based on optical fiber high non-linearity effect, to generate high repetition frequency
Nearly Gaussian ultrashort light pulse.In order to excite the high non-linearity effect of non-linear compression grade, generally requires and pass through seed pulse
High-power fiber amplifier carries out power amplification, but but also the light pulse signal-to-noise ratio variation generated, can not ensure light pulse
Quality.
To sum up, the generation scheme of existing ultrashort pulse cannot generate the ultrashort light pulse of stable high quality.
Invention content
The present invention provides a kind of Semiconductor laser device and method, to solve ultrashort arteries and veins existing in the prior art
Punching lead to the problem of scheme cannot generate ultrashort light pulse of the stable high quality without chirp.
An embodiment of the present invention provides a kind of Semiconductor laser equipment, which includes laser generation module, phase
Modulation module, intensity modulator, filter, compensating module and radio-frequency power supply module；
The laser generation module, the phase modulation module, the intensity modulator, the filter and the benefit
Module is repaid to be sequentially connected；
The radio-frequency power supply module is respectively that the phase modulation module and the intensity modulator provide radiofrequency signal；
The phase modulation module coordinates with the intensity modulator, the light letter for generating the frequency comb with flat-top
Number；
The filter, the optical signal for being exported to the intensity modulator carry out light spectrum reshaping；
The compensating module is used to carry out linear chrip compensation to the optical signal that the filter exports.
Optionally, the intensity modulator includes multiple MZ Mach-Zehnder MZM.
Multiple MZ Mach-Zehnder MZM combinations can generate the smaller photoswitch of switch window width.
Optionally, the intensity modulator is double parallel MZ Mach-Zehnder.
Double parallel MZ Mach-Zehnder can generate the smaller photoswitch of switch window width.
Optionally, the compensating module is dispersive medium.
The dispersive medium can remove the linear chrip caused by phase-modulator and intensity modulator.
Optionally, the laser generation module is laser, for generating direct current optical signal.
Optionally, the phase modulation module includes at least one phase-modulator, and the phase-modulator is used for institute
The direct current optical signal for stating laser generation module carries out phase adjusted.
Optical signal can make optical signal have phase corresponding with the radiofrequency signal of radio-frequency power supply by phase-modulator.
Optionally, the radio-frequency power supply module includes radio-frequency power supply and phase shifter, and the radio-frequency power supply is the phase tune
Molding block provides radiofrequency signal, and the radio-frequency power supply provides radiofrequency signal by the phase shifter for the intensity modulator,
In, the phase shifter can adjust the phase of the radiofrequency signal of the radio-frequency power supply output.
The combination of radio-frequency power supply and phase shifter can adjust the phase of the radiofrequency signal of offer, make to be input to phase-modulation mould
The radiofrequency signal of block and the radiofrequency signal for being input to intensity modulator have certain phase difference, are conducive to intensity modulator inhibition
Non-linear chirp in optical signal.
Optionally, the filter is programmable optical bandpass filter OBPF.
Different light spectrum reshaping effects can be realized by adjusting OBPF.
Optionally, the dispersive medium is one kind in following material：Dispersion compensating fiber DCF, single mode optical fiber SMF, light
Fine bragg grating FBG.
Optionally, the length of the dispersive medium is dispersion characteristics according to the dispersive medium, the phase-modulation mould
What block and the intensity modulator determined.
Dispersive medium, which selects length appropriate just, can be such that the linear chrip in optical signal removes.
An embodiment of the present invention provides a kind of method generating ultrashort light pulse, this method includes：
Direct current optical signal progress phase-modulation that phase modulation module and intensity modulator generate laser generation module and
Intensity modulated is to generate the optical signal of the frequency comb with flat-top, wherein radio-frequency power supply module is respectively the phase-modulation mould
Block and the intensity modulator provide radiofrequency signal；
The optical signal for the frequency comb with flat-top that filter exports the intensity modulator carries out light spectrum reshaping；
Compensating module carries out linear chrip compensation to the optical signal that the filter exports, and keeps the compensating module output super
Short optical pulse.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without having to pay creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is a kind of Semiconductor laser device structure schematic diagram of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of phase modulation module in Semiconductor laser equipment of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of double parallel MZ Mach-Zehnder of the embodiment of the present invention；
Fig. 4 is the RF signal input end schematic diagram of double parallel MZ Mach-Zehnder of the embodiment of the present invention；
Fig. 5 is that the direct current biasing of double parallel MZ Mach-Zehnder of the embodiment of the present invention adjusts port schematic diagram；
Fig. 6 is the structural schematic diagram of the generation equipment of another ultrashort light pulse of the embodiment of the present invention；
Fig. 7 is the spectrogram of direct current optical signal with chirp after phase-modulator of the embodiment of the present invention；
Fig. 8 is oscillogram of the embodiment of the present invention through the modulated light pulses of DPMZM；
Fig. 9 is spectrogram of the embodiment of the present invention through the modulated light pulses of DPMZM；
Figure 10 is the spectrogram of light pulse of the embodiment of the present invention after Gaussian OBPF shapings；
Figure 11 is the fitting of the waveform and Gaussian function curve of the light pulse of dispersive medium output port of the embodiment of the present invention
Figure；
Figure 12 is that the multiplexed letter of optical time division multiplexer is passed through in the light pulse of dispersive medium output port of the embodiment of the present invention
Number eye pattern；
Figure 13 is the spectrogram of light pulse of the embodiment of the present invention after nearly rectangle OBPF shapings；
Figure 14 is the waveform and sinc function curves of another light pulse of dispersive medium output port of the embodiment of the present invention
Fitted figure；
Figure 15 is a kind of generation ultrashort light pulse method flow schematic diagram of the embodiment of the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
The embodiment of the present invention is described in further detail with reference to the accompanying drawings of the specification.
As shown in Figure 1, a kind of Semiconductor laser equipment of the embodiment of the present invention, the equipment include laser generation module
100, phase modulation module 101, intensity modulator 102, filter 103, compensating module 104 and radio-frequency power supply module 105；
The laser generation module 100, the phase modulation module 101, the intensity modulator 102, the filter
103 and the compensating module 104 be sequentially connected；
The radio-frequency power supply module 105 is respectively that the phase modulation module 101 and the offer of the intensity modulator 102 are penetrated
Frequency signal.
The laser generation module can be laser, can generate direct current optical signal, and laser is merely illustrative, all
It is that can generate the device of direct current optical signal can be used as laser generation module.
The phase modulation module is used to carry out phase adjusted to the direct current optical signal that laser generation module generates, by institute
It is radiofrequency signal that state radio-frequency power supply module, which be the signal that the phase modulation module provides, so that optical signal by radio frequency by being believed
Number driving the phase modulation module after, chirp and phase change corresponding with radiofrequency signal are contained in direct current optical signal.
The compensating module is used to carry out linear chrip compensation to the optical signal that the filter exports.
As shown in Fig. 2, the phase modulation module 200 includes at least one phase-modulator 201, the phase-modulator
Phase adjusted is carried out for the direct current optical signal to the laser generation module.
The phase-modulator that the radio-frequency power supply module can include for the phase modulation module provides radiofrequency signal.
It should be noted that the radiofrequency signal that the radio-frequency power supply module provides can be cosine RF (Radio
Frequency, radio frequency) signal can also be sinusoidal RF signal；
The direct current optical signal that laser generation module generates is after the phase modulation module of cosine radio frequency signals drive, direct current
There are iwth sine chirp and cosine phase on optical signal；
The direct current optical signal that laser generation module generates is after the phase modulation module that sinusoidal radio frequency signal drives, direct current
There are cosine chirp and sinusoidal phase on optical signal.
Wherein, the iwth sine chirp or cosine chirp that direct current optical signal is generated by phase modulation module regard the base of optical signal as
Bottom point.
It is last in order to ensure since there are non-linear chirps in making optical signal after phase modulation module for optical signal
The optical signal of output is the closely light pulse without chirp, should inhibit the middle non-linear chirp of optical signal；
Inhibit the non-linear chirp in optical signal using intensity modulator；It can be with by the intensity modulator of radio frequency signals drive
The photoswitch with one fixed width switch window is formed, can effectively inhibit to be input to non-thread in the optical signal of intensity modulator
Property chirp.
The intensity modulator can be multiple MZ Mach-Zehnders (MZM) can also be a double parallel Mach once
Dare modulator (DPMZM)；
For a MZ Mach-Zehnder, the switch window width of the photoswitch of generation is larger, cannot be complete
Inhibit non-linear chirp；
Therefore it can be combined using multiple MZ Mach-Zehnders and be opened with generating the smaller light of switch window width
It closes.
Wherein, as shown in figure 3, double parallel MZ Mach-Zehnder belongs to integrated device, by two MZM namely MZM1 and
MZM2 is embedded into a MZM namely MZM3 and constitutes, and can load radiofrequency signal in MZM1 and MZM2 respectively.
For double parallel MZ Mach-Zehnder, due to there is multiple MZ Mach-Zehnders to integrate, photoswitch
Switch window width adjusting range bigger, the smaller photoswitch of switch window width can be formed, can preferably inhibit non-
Linear chrip, the radiofrequency signal adjusted on two MZ Mach-Zehnders can form different types of photoswitch.
Preferably, the intensity modulator can select double parallel MZ Mach-Zehnder.
As shown in figure 4, adjusting double parallel MZ Mach-Zehnder, can make in double parallel MZ Mach-Zehnder
Two MZ Mach-Zehnders respectively by different radiofrequency signal RF1 and RF2 drivings, to form different photoswitches.
As shown in figure 5, there are three direct current biasings to adjust port V1, V2, V3 for double parallel MZ Mach-Zehnder, respectively
The junction of corresponding MZM1, MZM2 and MZM1 and MZM2.RF1, RF2 are adjusted simultaneously and three direct current biasings adjusting ports can
To form different photoswitches；
It is driven by sinusoidal radio frequency signal for example, MZM1 can be arranged, when the radiofrequency signal port open of MZM2, adjusts three
Direct current biasing can be formed with the photoswitch compared with High Extinction Ratio and smaller duty ratio.
The intensity modulator is the radio frequency signals drive provided by radio-frequency power supply module；
The radio-frequency power supply module may include radio-frequency power supply and phase shifter (PS), and the radio-frequency power supply is the phase tune
Molding block provides radiofrequency signal, and the radio-frequency power supply provides radiofrequency signal by the phase shifter for the intensity modulator,
In, the phase shifter can adjust the phase of the radiofrequency signal of the radio-frequency power supply output.
Wherein, the radio-frequency power supply module provides two-way radiofrequency signal respectively, that is, is input to penetrating for the intensity modulator
Frequency signal and the radiofrequency signal for being input to phase modulation module, due to being input to the radiofrequency signal of the intensity modulator by moving
The adjusting of phase device so that two-way radiofrequency signal can adjust the photoswitch that phase shifter makes DPMZM there are certain phase difference
Switch window center is aligned with the center of optical signal base part, can effectively inhibit the non-linear chirp in optical signal.
Adjusting phase shifter and DPMZM can make have ideal linear chrip by the optical signal of DPMZM.Adjust DPMZM
The equidistant frequency that can make the optical signal by DPMZM that there is the frequency comb spectrum of flat-top namely the spectrum of optical signal to be discrete
The spectrum as comb of rate, flat-top refer to that the amplitude jitter between every spectral line of spectral centroid is less than 1dB.
DPMZM is adjusted, the optical signal of the frequency comb with near-linear chirp, high flat degree can be generated.
Make optical signal that there is the frequency comb spectrum of high flat degree, is conducive to carry out light spectrum reshaping, filtering is used in the present invention
Device carries out light spectrum reshaping to the optical signal that DPMZM is exported, and changes the intensity of frequency comb, makes the light of the optical signal of filter output
Spectrum and the time domain of target pulse meet Fourier transformation relationship, wherein target pulse refers to by Semiconductor laser equipment
Want the light pulse obtained.
Wherein, the filter refers to the filter for having light spectrum reshaping function, can be common OBPF (Optical
Band Pass Filter, optical band pass filter), can also be programmable OBPF, the programmable OBPF can pass through setting
The amplitude response characteristic for changing OBPF makes OBPF have different shaping effects, such as can may be programmed OBPF by adjusting and set
It sets and makes the OBPF with Gaussian light spectrum reshaping function, the optical signal of nearly flat-top frequency comb is after the OBPF of Gaussian
There can be Gauss spectrum；OBPF settings can be may be programmed by adjusting to make with rectangle spectrum shaping feature
OBPF, for the optical signal with flat-top frequency comb after the OBPF of rectangle, optical signal then has rectangle spectrum.
Optical signal by DPMZM can be the light pulse for having flat-top frequency comb, in phase modulation module, intensity modulated
Under device collective effect so that increase linear chrip in light pulse；
Therefore increasing compensating module, the compensating module is connect with the output port of the filter, for the filtering
The optical signal of device output carries out linear chrip compensation, namely eliminates the linear chrip in light pulse.
The compensating module can be dispersive medium, can also be other devices with dispersion compensation functions.
For dispersive medium, abbe number can be just or negative.
The dispersive medium is one kind in following material：DCF (Dispersion Compensated Fiber, dispersion
Compensated optical fiber), SMF (Single Mode Fiber, single mode optical fiber), FBG (Fiber Bragg Grating, optical fiber Bragg
Grating).
Correspondingly, the length of the dispersive medium be according to the dispersion characteristics of the dispersive medium, phase modulation module and
The length of the dispersive medium that intensity modulator determines namely described needs the abbe number with the dispersive medium, phase-modulation
The adjustment parameter of module and intensity modulator match could remove by phase modulation module, intensity modulator jointly caused by line
Property chirp.
It is illustrated in figure 6 a kind of structural schematic diagram of the equipment of generation ultrashort light pulse of the embodiment of the present invention, wherein wrapping
Include laser 600, phase-modulator 601, DPMZM602, filter 603, dispersive medium 604, radio-frequency power supply 605 and phase shift
Device 606；
Wherein, laser 600, phase-modulator 601, DPMZM602, filter 603 and dispersive medium 604 connect successively
It connects,
Radio-frequency power supply 605 is that phase-modulator 601 provides radiofrequency signal, and radio-frequency power supply 605 is by phase shifter 606
DPMZM602 provides radiofrequency signal.
Wherein, the model of each device and device parameter can be selected according to actual needs, following is a brief introduction of
A kind of combination of specific device：
Laser selection distributed feed-back (Distributed Feedback) laser, model Agilent81980A,
The direct current light signal center wavelength of injection is 1545.3nm (nanometer), mean power is 8dBm (decibel milli X)；Phase-modulator
The phase modulation coefficient of model EOSPACE PM-5V4-40, phase-modulator is about 3.7 π, is penetrated by the offer of radio-frequency power supply
Frequency signal drives, and radiofrequency signal is the sinusoidal radio frequency signal that frequency is 25GHz (girz), the model of radio-frequency power supply
Agilent N5183A.As shown in fig. 7, having the spectrogram of the direct current optical signal of non-linear chirp after phase-modulator.
The model FUJITSU FTM7961EX of DPMZM, for generating photoswitch, wherein the half-wave voltage of DPMZM is
The sinusoidal radio frequency signal driving that 6V, MZM1 by frequency are 25GHz, power is 22dBm, MZM2 do not connect drive signal；Radiofrequency signal
It is input to DPMZM after phase shifter is adjusted, makes the direct current optical signal at the switch window center and phase regulator output of DPMZM
Positive chirp area namely optical signal base part center alignment.
Three direct current biasings of DPMZM are adjusted, after DPMZM carries out intensity modulated, available full width at half maximum is optical signal
The chirped optical pulse of 9.8ps, waveform and spectrum difference are as shown in Figure 8 and Figure 9, and after DPMZM, light pulse is provided with nearly flat-top
The spectrum of frequency comb, while can be seen that and very big improvement is produced to the amplitude scintillation of pulse spectrum by the modulation of DPMZM,
The flatness of 19 spectral lines in center is about 1dB.
On the basis of the light pulse of nearly flat-top frequency comb, spectral shape is controlled by programmable OBPF, you can realize light
Compose shaping.To generate Gaussian pulse, setting OBPF is Gaussian type filter, and centre wavelength 1545.3nm, 3-dB bandwidth is
2.8nm.After OBPF is filtered, spectrum is as shown in Figure 10.As can be seen that this optical pulse also has the positive chirp of near-linear.
Dispersive medium can select length for the SMF of 160m (rice), to OBPF output light pulse in linear chrip into
Row compensation.
As shown in figure 11, solid line is the waveform of the light pulse of SMF output ports；Tubular wire is that full width at half maximum is about 1.5ps
Gaussian function curve.
Two kinds of curves are mutually fitted as seen from Figure 11, be computed the light pulse of SMF output ports time bandwidth
Product is 0.45.The pulse is the closely Gaussian pulse without chirp, and duty ratio is about 3.8%, extinction ratio is about 28dB；Namely it uses
Above-mentioned apparatus can generate the closely Gaussian light pulse without chirp.
The light pulse is after on-off keying (OOK) is modulated and 1 × 8 passive optical time division multiplexer is multiplexed, and signal eye diagram is such as
Shown in Figure 12.Multiplexed 8 × 25-Gb/s Optical Time Division Multiplexings (Optical Time Division Multiplexing,
OTDM) signal has more visible eye opening, and in the time domain without apparent intersymbol interference.
On the basis of the light pulse of nearly flat-top frequency comb, spectral shape is controlled by programmable OBPF, you can realize light
Compose shaping.To generate nyquist pulse, setting OBPF is nearly rectangular filter, and sideband inhibition ratio is 30dB, centre wavelength is
1545.3nm, bandwidth 3.6nm.After OBPF is filtered, spectrum is as shown in figure 13.As can be seen that this optical pulse also has closely
Linear positive chirp.
Dispersive medium can select length for the SMF of 160m (rice), to OBPF output light pulse in linear chrip into
Row compensation.
As shown in figure 14, solid line is the waveform of the light pulse of SMF output ports；Tubular wire is that full width at half maximum is about 2ps's
Sinc (Singh) function curve.
Two kinds of curves are mutually fitted as seen from Figure 14, which is the closely nyquist pulse without chirp, is computed
The duty ratio for obtaining the light pulse of SMF output ports is about 5%；Namely the closely Nai Kui without chirp can also be generated using above-mentioned apparatus
This special light pulse.
Based on same inventive concept, this discovery embodiment additionally provides a kind of method generating ultrashort light pulse.Due to this
It is similar that the principle that terminal solves the problems, such as and the embodiment of the present invention generate the equipment of ultrashort light pulse, therefore the implementation of this method can be with
Referring to the implementation of equipment, overlaps will not be repeated.
As shown in figure 15, a kind of method generating ultrashort light pulse of the embodiment of the present invention, this method include：
Step 1501：Phase modulation module carries out phase with intensity modulator to the direct current optical signal that laser generation module generates
Position modulation and intensity modulated are to generate the optical signal of the frequency comb with flat-top, wherein radio-frequency power supply module is respectively the phase
Position modulation module and the intensity modulator provide radiofrequency signal；
Step 1502：The optical signal for the frequency comb with flat-top that filter exports the intensity modulator carries out spectrum
Shaping；
Step 1503：Compensating module carries out linear chrip compensation to the optical signal that the filter exports, and makes the compensation
Module exports ultrashort light pulse.
The phase modulation module carries out phase adjusted to the direct current optical signal that laser generation module generates, and is penetrated due to described
Frequency power module is that the signal that the phase modulation module provides is radiofrequency signal so that optical signal by radiofrequency signal by being driven
After the dynamic phase modulation module, chirp and phase change corresponding with radiofrequency signal are contained in direct current optical signal.
It should be noted that the radiofrequency signal that the radio-frequency power supply module provides can be that (signal can also be cosine RF
Sinusoidal RF signal；
The direct current optical signal that laser generation module generates is after the phase modulation module of cosine radio frequency signals drive, direct current
There are iwth sine chirp and cosine phase on optical signal；
The direct current optical signal that laser generation module generates is after the phase modulation module that sinusoidal radio frequency signal drives, direct current
There are cosine chirp and sinusoidal phase on optical signal.
Wherein, the iwth sine chirp or cosine chirp that direct current optical signal is generated by phase modulation module regard the base of optical signal as
Bottom point.
It is last in order to ensure since there are non-linear chirps in making optical signal after phase modulation module for optical signal
The optical signal of output is the closely light pulse without chirp, should inhibit the middle non-linear chirp of optical signal；
Inhibit the non-linear chirp in optical signal using intensity modulator；It can be with by the intensity modulator of radio frequency signals drive
The photoswitch with one fixed width switch window is formed, can effectively inhibit to be input to non-thread in the optical signal of intensity modulator
Property chirp.
The intensity modulator can be that multiple MZ Mach-Zehnders can also be a double parallel mach zhender
Modulator；
The intensity modulator is the radio frequency signals drive provided by radio-frequency power supply module, and the radio-frequency power supply module can
To include radio-frequency power supply and phase shifter, the radio-frequency power supply provides radiofrequency signal, the radio frequency electrical for the phase modulation module
Source provides radiofrequency signal by the phase shifter for the intensity modulator, wherein the phase shifter can adjust the radio frequency
The phase of the radiofrequency signal of power supply output.
The radio-frequency power supply module provides two-way radiofrequency signal respectively, that is, is input to the radiofrequency signal of the intensity modulator
With the radiofrequency signal for being input to phase modulation module, the radiofrequency signal due to being input to the intensity modulator passes through phase shifter
It adjusts so that two-way radiofrequency signal can adjust the photoswitch that phase shifter makes intensity modulator there are certain phase difference
Switch window center is aligned with the center for the optical signal base part that phase modulation module exports, and can effectively be inhibited in optical signal
Non-linear chirp.
Adjusting phase shifter and intensity modulator can make the optical signal by intensity modulator have ideal linear chrip.
Adjusting strength modulator can make frequency comb spectrum of the optical signal by intensity modulator with flat-top；
Make optical signal that there is the frequency comb spectrum of high flat degree, is conducive to carry out light spectrum reshaping, filtering is used in the present invention
Device carries out light spectrum reshaping to the optical signal that intensity modulator exports, and changes the intensity of frequency comb, the light of filter output is made to believe
Number spectrum and the time domain of target pulse meet Fourier transformation relationship, wherein target pulse refers to being produced by ultrashort light pulse
Generating apparatus wants the light pulse obtained.
The compensating module is connect with the output port of the filter, to the optical signal of filter output into line
Property chirp compensation, namely eliminate the linear chrip in light pulse, make compensating module output ultrashort light pulse.
The compensating module can be dispersive medium, can also be other devices with dispersion compensation functions.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (12)
1. a kind of Semiconductor laser equipment, which is characterized in that the equipment include laser generation module, phase modulation module,
Intensity modulator, filter, compensating module and radio-frequency power supply module；
The laser generation module, the phase modulation module, the intensity modulator, the filter and the compensation mould
Block is sequentially connected；
The radio-frequency power supply module is respectively that the phase modulation module and the intensity modulator provide radiofrequency signal；
The phase modulation module coordinates with the intensity modulator, the optical signal for generating the frequency comb with flat-top；
The filter, the optical signal for being exported to the intensity modulator carry out light spectrum reshaping；
The compensating module, the optical signal for being exported to the filter carry out linear chrip compensation.
2. equipment as described in claim 1, which is characterized in that the intensity modulator includes multiple MZ Mach-Zehnders
MZM。
3. equipment as described in claim 1, which is characterized in that the intensity modulator is double parallel MZ Mach-Zehnder
DPMZM。
4. equipment as described in claim 1, which is characterized in that the compensating module is dispersive medium.
5. equipment as described in claim 1, which is characterized in that the laser generation module is laser, for generating direct current
Optical signal.
6. the equipment as described in claim 1 or 5, which is characterized in that the phase modulation module includes at least one phase tune
Device processed, the phase-modulator are used to carry out phase adjusted to the direct current optical signal of the laser generation module.
7. equipment as described in claim 1, which is characterized in that the radio-frequency power supply module includes radio-frequency power supply and phase shifter,
The radio-frequency power supply provides radiofrequency signal for the phase modulation module, and the radio-frequency power supply is described strong by the phase shifter
It spends modulator and radiofrequency signal is provided, wherein the phase shifter adjusts the phase of the radiofrequency signal of the radio-frequency power supply output.
8. equipment as described in claim 1, which is characterized in that the filter is programmable optical bandpass filter OBPF.
9. equipment as claimed in claim 4, which is characterized in that the dispersive medium is one kind in following material：Dispersion is mended
Repay optical fiber DCF, single mode optical fiber SMF, optical fiber bragg grating FBG.
10. equipment as claimed in claim 4, which is characterized in that the length of the dispersive medium is according to the dispersive medium
Dispersion characteristics, the phase modulation module and the intensity modulator determine.
11. a kind of method generating ultrashort light pulse, which is characterized in that this method includes：
Phase modulation module carries out phase-modulation and intensity with intensity modulator to the direct current optical signal that laser generation module generates
Modulation to generate the optical signal of the frequency comb with flat-top, wherein radio-frequency power supply module be respectively the phase modulation module and
The intensity modulator provides radiofrequency signal；
The optical signal for the frequency comb with flat-top that filter exports the intensity modulator carries out light spectrum reshaping；
Compensating module carries out linear chrip compensation to the optical signal that the filter exports, and makes the compensating module output ultrashort laser
Pulse.
12. method as claimed in claim 11, which is characterized in that the radio-frequency power supply module is respectively the phase-modulation mould
Block and the intensity modulator provide radiofrequency signal, including：
The radio-frequency power supply mould phase shifter in the block adjusts the radio frequency of radio-frequency power supply mould radio-frequency power supply module output in the block
The phase of signal makes the substrate at the switch window center and the optical signal of phase modulation module output of the intensity modulator
Portion centers overlap.
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