CN109873288A - A kind of wave forms controller - Google Patents
A kind of wave forms controller Download PDFInfo
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- CN109873288A CN109873288A CN201711262830.1A CN201711262830A CN109873288A CN 109873288 A CN109873288 A CN 109873288A CN 201711262830 A CN201711262830 A CN 201711262830A CN 109873288 A CN109873288 A CN 109873288A
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- predistortion
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Abstract
The present invention provides a kind of wave forms controllers, seed semiconductor laser and fiber amplifier including low-power, it further include predistortion pulse driver, predistortion pulse driver includes predistortion impulse generator and driving circuit, predistortion impulse generator generates the pulse signal string of the non-uniform pulse signal of amplitude distribution or time encoding, it is injected into driving circuit, the pulse current of generation is used to drive seed semiconductor laser, generate a certain repetition rate, the output of the laser of pulse width and pulse shape, in the laser injection fiber amplifier that seed semiconductor laser generates, output optical fibre is output to after amplification to be exported.The present invention can be realized high power, flat long pulse width laser output；The pulse laser of predistortion is generated using electrical modulation, compared to predistortion injected pulse laser is obtained using additional intensity modulator, cost of the invention is low.
Description
Technical field
The invention belongs to laser technology field more particularly to a kind of high power, long pulse width, wave-like flat Novel wrist
Rush waveshape monitor.
Background technique
In Atmospheric Survey, 3D scanning, windfinding radar, remote sensing, optical sensing (Brillouin light domain reflectometer), laser
The application fields such as frequency transformation need high power, flat Long Pulse LASER.In certain optical sensing fields, it is also necessary to the time
The flat pulse laser string of coding.And ordinary optic fibre amplifier is not able to satisfy the demand.
Master oscillation power amplification technology is to use the laser of a low-power as seed light, is injected into high-power fiber
In amplifier, the high power laser light at seed optical wavelength is obtained by power amplification and is exported.This technology is not only able to obtain
High-power laser output, and the wavelength of output laser, repetition rate are determined by seed light source, spectral width and pulse width
Mainly determined by seed light source.
But in fiber amplifier, there are the characteristics that energy is saturated for gain fibre.Light pulse rising edge first into
After entering gain fibre, gain amplifier is obtained, while consuming the upper energy level population in gain fibre.To make post laser infuse
Fashionable, the upper energy level population in optical fiber is reduced, and the gain for causing it to obtain also is reduced.Therefore, in the main oscillations of pulse output
In power amplifier technology, the gain that pulse front edge obtains is higher, and the gain of the rest part of pulse is rendered as exponential damping
Distribution causes to export the deformation and distortion of pulse in the time domain.
In fiber amplifier, with the increase of power amplification multiple, the when area deformation of amplification output pulse laser is tighter
Weight.With the increase of input pulse laser width, the metamorphopsic distortion of amplification output pulse laser is more serious.Therefore, it is difficult to obtain
The laser output of high power, long pulse width.
Summary of the invention
The problem to be solved in the present invention is: the main purpose of the present invention is to provide predistortion seed sources in conjunction with high-power
Fiber amplifier can be realized high power, flat long pulse width laser output；The present invention is to solve pulse input to optical fiber
In amplifier, injection laser is by fiber amplifier in the process since energy saturation causes the rising edge of pulse laser to obtain height
Gain and afterpulse obtain the gain problem that gradually decreases, and cause pulse length distortion serious；Either in the burst length
When the multi-pulsed laser input of coding, amplify the widely different problem of the peak power of output pulse string.
In order to solve the above technical problems, the invention the technical solution adopted is that: a kind of wave forms controller, including
The seed semiconductor laser and fiber amplifier of low-power further include predistortion pulse driver, and the predistortion pulse is driven
Dynamic device includes predistortion impulse generator and driving circuit, and the predistortion impulse generator generates the non-uniform arteries and veins of amplitude distribution
The pulse signal string for rushing signal or time encoding, is injected into the driving circuit, and the pulse current of generation is used to drive institute
Seed semiconductor laser is stated, the laser output of a certain repetition rate, pulse width and pulse shape is generated, the seed is partly led
The laser that body laser generates injects in the fiber amplifier, is output to by the amplified laser of the fiber amplifier defeated
Optical fiber out, the output optical fibre export amplified laser.
The predistortion impulse generator includes master controller and field programmable gate array, the driving circuit packet
Include digital analog converter and power amplifier output section；The master controller realizes interface operation related to user and instruction sum number
According to interactively communicate, and control is programmed to field programmable gate array；The field programmable gate array pair
The digital analog converter is driven and is controlled, and the pre-distorted digital waveform that the master controller is set is output to the number
Mode converter realizes the conversion of predistortion pulse signal；The predistortion pulse signal is input to the power amplification output section
It point amplifies, and is converted to power drive signal and exports and give seed semiconductor laser.
The field programmable gate array is high-speed field programmable gate array；The digital analog converter is height
Fast digital analog converter, sample frequency are greater than 500MHz；The driving circuit is intermediate frequency high power amplifier.
The fiber amplifier includes high-power fiber amplifier, and the high-power fiber amplifier is by the second optical isolation
Device, pump signal optical-fiber bundling device, multimode pumping semiconductor laser and double clad gain fibre collectively constitute, second light
Isolator is connected with the input terminal of the pump signal optical-fiber bundling device with multimode pumping semiconductor laser, the pump
The output end of Pu signal optical fibre bundling device is connect with the double clad gain fibre.
The high-power fiber amplifier is multiple cascades.
The fiber amplifier further includes low-power fiber amplifier, and the low-power fiber amplifier is by the first optical isolation
Device, wavelength division multiplexer, single pumping semiconductor laser and single mode gain fibre composition；First optoisolator and wavelength division multiplexer
Input terminal connection；The input terminal of the wavelength division multiplexer is connect with single pumping semiconductor laser, the wavelength division multiplexer
Output end connect with the single mode gain fibre.
The low-power fiber amplifier is multiple cascades.
Filter is equipped with before every grade of high-power fiber amplifier, the filter is frequency domain and/or time-domain filtering
Device.
Filter is equipped with before every grade of low-power fiber amplifier, the filter is frequency domain and/or time-domain filtering
Device.
The double clad gain fibre and the single mode gain fibre are to mix rare earth ytterbium ion optical fiber or mix rare earth neodymium ion
Optical fiber mixes rare earth erbium ion optical fiber or mixes rare earth thulium ion optical fiber.
The advantages and positive effects of the present invention are: due to the adoption of the above technical scheme, high power, flat can be realized
Long pulse width laser output；The present invention is the pulse laser that predistortion is generated using electrical modulation, additional strong compared to using
Modulator is spent to obtain predistortion injected pulse laser, and cost of the invention is low.
Detailed description of the invention
Below with reference to specific drawings and examples, the invention will be further described.
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is predistortion pulse driver operation principle schematic diagram of the invention；
Fig. 3 is the pulse shape one that predistortion pulse signal generator generates；
Fig. 4 is the pulse shape two that predistortion pulse signal generator generates；
Fig. 5 is the train of pulse that there is different time to encode；
Fig. 6 is the seed pulse laser for inputting square-wave waveform；
Fig. 7 is the seed pulse laser of Fig. 6 in the pulse laser waveform exported after amplification；
Fig. 8 is with the input pulse laser of 0.5 power predistortion waveform of time relationship；
Fig. 9 is the pulse laser of Fig. 8, and the waveform of pulse laser is exported after amplification；
Figure 10 is with the input pulse laser of 1 power predistortion waveform of time relationship；
Figure 11 is that the pulse laser of Figure 10 exports the waveform of pulse laser after amplification.
In figure:
| 101, seed semiconductor laser | 102, predistortion impulse generator |
| 103, driving circuit | 104, the first optoisolator |
| 105, wavelength division multiplexer | 106, mode pump semiconductor laser |
| 107, single mode gain fibre | 108, low-power (single mode) fiber amplifier |
| 109, the second optoisolator | 110, pump signal optical-fiber bundling device |
| 111, multimode pumps semiconductor laser | 112, double clad gain fibre |
| 113, high power (double clad) fiber amplifier | 114, output optical fibre |
| 115, predistortion pulse driver | 116, filter |
| 201, master controller | 202, field programmable gate array |
| 203, digital analog converter | 204, power amplification exports |
Specific embodiment
As shown in Figure 1, a kind of Novel fiber laser, seed semiconductor laser 101 and optical fiber including low-power are put
Big device further includes predistortion pulse driver 115, and the predistortion pulse driver 115 includes predistortion impulse generator 102
With driving circuit 103, the predistortion impulse generator 102 generates the non-uniform pulse signal of amplitude distribution or time encoding
Pulse signal string, be injected into the driving circuit 103, the pulse current of generation is used to that the seed semiconductor is driven to swash
Light device 101 generates the laser output of a certain repetition rate, pulse width and pulse shape, the seed semiconductor laser 101
The laser of generation injects in the fiber amplifier, is output to output optical fibre by the amplified laser of the fiber amplifier
114, the output optical fibre 114 exports amplified laser.
As shown in Fig. 2, the predistortion impulse generator includes master controller (MCU) 201 and field programmable gate
Array (FPGA) 202, the driving circuit include digital analog converter (DA) 203 and power amplifier output section 204；The master control
Device (MCU) 201 processed realizes interactively communicating for interface operation and instruction and data related to user, and to field programmable logic
Gate array (FPGA) 202 is programmed control；Described 202 pairs of digital analog converters of field programmable gate array (FPGA)
(DA) it 203 is driven and is controlled, the pre-distorted digital waveform that the master controller (MCU) 201 is set is output to described
Digital analog converter (DA) 203 realizes the conversion of predistortion pulse signal；The predistortion pulse signal is input to the power and puts
Big output par, c 204 amplifies, and is converted to power drive signal and exports to driving circuit 103, realizes predistortion light pulse
The output of signal.
Fig. 3, Fig. 4 are respectively the modulation output pulse laser of different predistortion amplitude distributions.Fig. 5 is to compile with different time
The train of pulse of code.
Electric impulse signal of the predistortion pulse signal generator 102 to generate laser modulation, output pulse signal
Amplitude, waveform, width and repetition rate can be configured by software interface, to offset because being distorted caused by image intensifer.
Since the gain in the injected pulse forward position in fiber amplifier is higher, and the gain of afterpulse gradually decrease, in injected pulse
In the time domain specification of laser, injected pulse front edge portion is modulated into lower amplitude, and the amplitude of afterpulse gradually increase,
Therefore after undergoing fiber amplifier, energy saturated characteristic is total in seed injection pulse laser predistortion and fiber amplifier
Under same-action, flat Long Pulse LASER output can be obtained.
The pulse laser of predistortion is injected into the fiber amplifier and high-power fiber amplifier of low-power, can be obtained
Obtain high-power amplification laser output.For different output peak powers and fiber amplifier, need design optimization different
The waveform of predistortion seed pulse laser, to obtain flat, long pulse width high power pulsed laser output.
The present embodiment uses ALTERA company high speed programmable logic array device, and working frequency is up to 300MHz, electricity
Road can realize that adjustable precision is 3.4ns, i.e., pulse minimum widith is 3.4ns (being free of driving capability) namely pulse regulation step
It is long.Select high speed 12-bit digital-to-analog converter, predistorted signal amplitude adjustable range 20dB.A variety of pre- mistakes may be implemented by programming
The output of true signal.Typical monocycle typical output curve as shown in figure 3, figure 4 and figure 5, has respectively corresponded different predistortions
Impulse waveform.
By the predistortion to input pulse laser waveform, the arteries and veins in conjunction with caused by the energy saturation of high-power fiber amplifier
Higher gain can be obtained by rushing forward position, and obtain the characteristics of gain gradually decreases later, mutually compensate the two, to obtain
Uniform long pulse width laser output.
Fig. 6 is the square wave input impulse waveform of conventional electrical modulation in fiber amplifier, is square-wave form, pulse width
100ns, input peak power are 0.01W；Fig. 7 is by the amplified shape for exporting pulse laser.It can be seen from the figure that putting
The forward position of big output pulse laser causes the peak power of pulse front edge higher because acquisition gain is higher；And pulse back edge
Gain is less, cause export pulse laser amplitude gradually decrease, so that long pulse width, flat impulse wave can not be exported
Shape.
Fig. 8, Figure 10 be predistortion after pulse fiber amplifier in input laser shape；Fig. 9, Figure 11 are output pulse
The shape of laser.Wherein, Fig. 8 is with the input pulse laser of 0.5 power relationship predistortion of time relationship, and Figure 10 is with the time
The input pulse laser of linear (1 power) predistortion of relationship, Fig. 9, Figure 11 are respectively Fig. 8, Figure 10 by amplified output arteries and veins
Impulse light.
It can be seen from the figure that in this fiber ring laser system, input pulse laser with 0.5 time of time relationship
After square predistortion, the waveform of amplification output pulse laser is relatively flat, and pulse width is wider.
The field programmable gate array 202 is high-speed field programmable gate array；The digital analog converter
203 be high-speed A/D converter, and sample frequency is greater than 500MHz, realizes the conversion of high-speed figure analog signal；The driving circuit
103 be intermediate frequency high power amplifier.
The fiber amplifier includes high-power fiber amplifier 113, and the high-power fiber amplifier 113 is by second
Optoisolator 109, pump signal optical-fiber bundling device 110, multimode pumping semiconductor laser 111 and double clad gain fibre 112
Collectively constitute, second optoisolator 109 and multimode pumping semiconductor laser 111 with the pump signal optical fiber
The input terminal of bundling device 110 is connected, the output end of the pump signal optical-fiber bundling device 110 and the double clad gain fibre
112 connections.
The high-power fiber amplifier 113 is multiple cascades.
The fiber amplifier further includes low-power fiber amplifier 108, and the low-power fiber amplifier 108 is by
One optoisolator 104, wavelength division multiplexer 105, single pumping semiconductor laser 106 and single mode gain fibre 107 form；First light
Isolator 104 is connect with the input terminal of wavelength division multiplexer 105；The input terminal of the wavelength division multiplexer 105 and single pumping half
Conductor laser 106 connects, and the output end of the wavelength division multiplexer 105 is connect with the single mode gain fibre 107.
The low-power fiber amplifier 108 is multiple cascades.
The difference that laser power is exported according to seed semiconductor laser 101, can be used multiple low-power fiber amplifiers
Device 108 or multiple high-power fiber amplifiers 113, to obtain desired output laser power.
1) such as when seed laser power is lower, the fiber amplifier 108 using multiple low-power can be cascaded, when
When seed laser power is higher, the fiber amplifier 108 of low-power can not used.
2) in order to realize that high power laser light exports, it can cascade and use multiple high-power fiber amplifiers 113.
Filter is equipped with before every grade of high-power fiber amplifier 113, the filter is frequency domain and/or time domain
Filter.
Filter is equipped with before every grade of low-power fiber amplifier 108, the filter is frequency domain and/or time domain
Filter.
When using multiple fiber amplifier grades, putting of generating in previous amplifying stage is filtered out using different filters 116
Big natural emission optical noise (ASE) obtains high-power amplification laser output to improve the gain of next fiber amplifier.
Wherein, filter (116) may include:
1) frequency domain filter.By using frequency filter, the laser of special range of wavelength is only allowed to pass through, to eliminate
(avoiding) filter passes through the light other than wave-length coverage, into next fiber amplifier grade.
2) time domain filtering.By time domain filtering, only allow the laser of specific time through wave filter, thus in time domain
Noise light other than upper elimination specific time, into next amplifying stage.
3) time domain filtering and frequency domain filter can be used, simultaneously to eliminate other than specific time and particular range of wavelengths
Noise light, into next amplifying stage.
4) according to the characteristic of output laser, the filter can also not used.
The double clad gain fibre 112 and the single mode gain fibre 107 are to mix rare earth ytterbium ion optical fiber or mix rare earth
Neodymium ion optical fiber mixes rare earth erbium ion optical fiber or mixes rare earth thulium ion optical fiber.
Can choose suitable seed semiconductor laser output wavelength and different gain fibres, realize needed for wave
The laser output of long high power, long pulse width, flat waveform.Such as:
1) using mix rare earth ytterbium ion (Yb) gain fibre and corresponding seed laser wavelength (1030nm~
1120nm), the laser output of the high power, long pulse width, wave-like flat of 1030nm~1120nm may be implemented；
2) it using the gain fibre and corresponding seed laser wavelength (1053nm) for mixing rare earth neodymium ion (Nd), may be implemented
The laser output of the high power, long pulse width, flat waveform of 1053nm；
3) using mix rare earth erbium ion (Er) gain fibre box and corresponding seed laser wavelength (1530nm~
1620nm), the laser output of the high power, long pulse width, wave-like flat of 1530nm~1620nm may be implemented；
4) using mix rare earth thulium ion (Tm) gain fibre and corresponding seed laser wavelength (1950nm~
2050nm), the laser output of the high power, long pulse width, wave-like flat of 1950nm~2050nm may be implemented.
The spectral width of output laser is determined by seed light source:
1) use narrow linewidth seed laser, by export narrow linewidth, high power, long pulse width, wave-like flat light
Fibre laser.
2) the seed laser light source for using wide spectrum will export wide spectrum, high power, long pulse width, wave-like flat
Optical fiber laser.
One embodiment of the present invention has been described in detail above, but the content is only the preferable implementation invented
Example, should not be construed as limiting the practical range of invention.Any changes and modifications in accordance with the scope of the present application,
It should still be within the scope of the patent of the present invention.
Claims (10)
1. a kind of wave forms controller, seed semiconductor laser and fiber amplifier including low-power, it is characterised in that:
It further include predistortion pulse driver, the predistortion pulse driver includes predistortion impulse generator and driving circuit, institute
The pulse signal string that predistortion impulse generator generates the non-uniform pulse signal of amplitude distribution or time encoding is stated, is injected into
In the driving circuit, the pulse current of generation is used to drive the seed semiconductor laser, generates a certain repetition rate, arteries and veins
The laser output of width and pulse shape is rushed, the laser that the seed semiconductor laser generates injects the fiber amplifier
In, it is output to output optical fibre by the amplified laser of the fiber amplifier, the output optical fibre is defeated by amplified laser
Out.
2. wave forms controller according to claim 1, it is characterised in that: the predistortion impulse generator includes master
Controller and field programmable gate array, the driving circuit include digital analog converter and power amplifier output section；Institute
It states master controller and realizes interactively communicating for interface operation and instruction and data related to user, and to field programmable gate
Array is programmed control；The field programmable gate array is driven and is controlled to the digital analog converter, by institute
It states the pre-distorted digital waveform that master controller is set and is output to the digital analog converter, realize turning for predistortion pulse signal
It changes；The predistortion pulse signal is input to the power amplifier output section and amplifies, and is converted to power drive signal
It exports and gives seed semiconductor laser.
3. wave forms controller according to claim 2, it is characterised in that: the field programmable gate array is
High-speed field programmable gate array；The digital analog converter is high-speed A/D converter, and sample frequency is greater than 500MHz；Institute
Stating driving circuit is intermediate frequency high power amplifier.
4. wave forms controller according to claim 1, it is characterised in that: the fiber amplifier includes high power light
Fiber amplifier, the high-power fiber amplifier pump semiconductor by the second optoisolator, pump signal optical-fiber bundling device, multimode
Laser and double clad gain fibre collectively constitute, second optoisolator and the multimode pumping semiconductor laser with
The input terminal of the pump signal optical-fiber bundling device is connected, the output end of the pump signal optical-fiber bundling device and the double clad
Gain fibre connection.
5. wave forms controller according to claim 4, it is characterised in that: the high-power fiber amplifier is multiple
Cascade.
6. wave forms controller according to claim 4 or 5, it is characterised in that: the fiber amplifier further includes low
Power fiber amplifier, the low-power fiber amplifier is by the first optoisolator, wavelength division multiplexer, single pumping semiconductor laser
Device and single mode gain fibre composition；The connection of the input terminal of first optoisolator and wavelength division multiplexer；The wavelength division multiplexer it is defeated
Enter end to connect with single pumping semiconductor laser, the output end of the wavelength division multiplexer and the single mode gain fibre connect
It connects.
7. wave forms controller according to claim 6, it is characterised in that: the low-power fiber amplifier is multiple
Cascade.
8. wave forms controller according to claim 7, it is characterised in that: every grade of high-power fiber amplifier it
Preceding to be equipped with filter, the filter is frequency domain and/or time domain filtering.
9. wave forms controller according to claim 7, it is characterised in that: every grade of low-power fiber amplifier it
Preceding to be equipped with filter, the filter is frequency domain and/or time domain filtering.
10. wave forms controller according to claim 6, it is characterised in that: the double clad gain fibre and described
Single mode gain fibre is to mix rare earth ytterbium ion optical fiber or mix rare earth neodymium ion optical fiber or mix rare earth erbium ion optical fiber or mix rare earth thulium
Ion optical fiber.
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|---|---|---|---|
| CN201711262830.1A CN109873288A (en) | 2017-12-04 | 2017-12-04 | A kind of wave forms controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711262830.1A CN109873288A (en) | 2017-12-04 | 2017-12-04 | A kind of wave forms controller |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817127A (en) * | 2020-07-07 | 2020-10-23 | 上海瀚宇光纤通信技术有限公司 | Output control device and control method of laser and laser wind measuring radar |
| CN112582872A (en) * | 2020-12-10 | 2021-03-30 | 上海飞博激光科技有限公司 | Functional module and method for inhibiting waveform distortion |
| 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 |
| CN113937602A (en) * | 2021-09-15 | 2022-01-14 | 中国电子科技集团公司第十一研究所 | Pulse fiber laser |
| CN114094432A (en) * | 2021-11-02 | 2022-02-25 | 北京卓镭激光技术有限公司 | Solid laser system with adjustable pulse waveform and pulse waveform adjusting method |
-
2017
- 2017-12-04 CN CN201711262830.1A patent/CN109873288A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817127A (en) * | 2020-07-07 | 2020-10-23 | 上海瀚宇光纤通信技术有限公司 | Output control device and control method of laser and laser wind measuring radar |
| CN112582872A (en) * | 2020-12-10 | 2021-03-30 | 上海飞博激光科技有限公司 | Functional module and method for inhibiting waveform distortion |
| 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 |
| CN113937602A (en) * | 2021-09-15 | 2022-01-14 | 中国电子科技集团公司第十一研究所 | Pulse fiber laser |
| CN114094432A (en) * | 2021-11-02 | 2022-02-25 | 北京卓镭激光技术有限公司 | Solid laser system with adjustable pulse waveform and pulse waveform adjusting method |
| CN114094432B (en) * | 2021-11-02 | 2022-08-09 | 北京卓镭激光技术有限公司 | Solid laser system with adjustable pulse waveform and pulse waveform adjusting method |
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Application publication date: 20190611 |