CN105181154B - A kind of multiple beam WBFM pulse laser waveform concentrates measurement apparatus - Google Patents
A kind of multiple beam WBFM pulse laser waveform concentrates measurement apparatus Download PDFInfo
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Abstract
The invention provides a kind of multiple beam WBFM pulse laser waveform to concentrate measurement apparatus.Tested multiple beam frequency modulation on pulse light in described device, through light electrooptic conversion module, per road output different wave length and the continuous light in arrowband comprising tested optical information；Each continuous light in road is transmitted to the input of the corresponding wave band of optical fibre wavelength-division multiplex switch module, output arrowband long pulse by single-mode fiber to be washed off；Each road long pulse is washed off to be inputted to the input of the corresponding wave band of optical fibre time division Multiplexing module through different single-mode fibers respectively, by single single-mode fiber output with etc. time delay serial long pulse pulsed light signal；Through fiber amplifier, inputted by optical fiber to photodetector, output electric signal and oscillograph is entered by cable, output data is sent into computer through netting twine and carries out data processing.The present invention has high reliability, and information can be transmitted over long distances, and the concentration especially suitable for large-scale device of high power laser multiple beam WBFM burst length waveform measures.
Description
Technical field
The invention belongs to high power laser light parameter measuring technical field, and in particular to a kind of multiple beam WBFM pulse swashs
Waveform concentrates measurement apparatus, suitable for the long-range collection of the large-scale device of high power laser WBFM pulse laser waveform of a lot of beam
Middle measurement apparatus.
Background technology
In large-scale a lot of beam high-power laser driver, pulse laser is frequently with WBFM pulse, its spectral composition
For the comb δ function formula of discrete distribution, and with it is very strong when compose relevance, the faint of spectral component unbalance will cause impulse waveform
Modulate.Different from WBFM pulse, narrow-band impulse is because spectral composition is single, and in the absence of amplitude-frequency effect, its light beam is cut
The time response of spatial points is consistent on face, and consistent with the time response of unified light beam.Large-scale device of high power laser bag
Containing tens to road laser beams up to a hundred, the chirp waveform measurement of the unified light beam in each road is on the one hand realized；On the other hand,
The remote centralized measurement of each road light beam is realized, measuring apparatus is reduced, reduces plant running cost.
At present, large-scale device of high power laser output nanosecond pulsed waveform measuring method has three kinds, and a kind of method is to use
Photoelectric tube and high bandwidth digital oscilloscope, this method can receive unified light beam and obtain when in face of WBFM pulse
Waveform is obtained, but is constrained to one passage of oscillograph to measure bandwidth and the dispersion of single channel light beam and high speed cable, same
When in face of multi beam number, more diagnostic points large scale laser instrument when, using cable transmission be unfavorable for information long range fidelity transmit
Measured with concentrating, and due to needing to use a large amount of oscillographs to cause plant running with high costs；Second method is to pass through light
Fibre sampling and time-multiplexed optical transport technology simultaneously realize multiple laser arteries and veins with reference to ultrafast photoelectric detector and high bandwidth oscilloscope
Concentration measurement of the waveform in the single passage of oscillograph is rushed, this method is beneficial to the undistorted transmission of long range for realizing information and is
System is integrated, and the operating cost of laser aid can be greatly reduced, but this method is when in face of WBFM pulse, due to light
Fine sampling mode is that beam cross section is local or point samples, and easily causes spectrum component to lose during light beam with fiber coupling
Weighing apparatus, causes additional waveform modulated, the shape information obtained can not accurately reflect the time response of unified light beam, therefore above-mentioned
The application of two kinds of nanosecond pulsed waveform measuring methods is restricted；The third method is the combination of first two method, is passed through
Photoelectric tube receives unified light beam and realizes opto-electronic conversion, is converted to electric impulse signal with identical ripple using straight light modulation modulator
The narrow band light pulse of shape is simultaneously transmitted by optical fiber distance, and pulse laser is realized by ultrafast photoelectric detector and high bandwidth oscilloscope
The measurement of waveform.This method can realize that unified light beam chirp waveform measurement and the long-range fidelity of signal long-distance pass
It is defeated, it is easy to realize that multiple beam concentrates measurement using optical fibre time division multiplexing technology, but directly light modulation modulator is in output narrow band light arteries and veins
While punching, the continuous light of certain power is also exported, in concentration measurement time-multiplexed in face of multiple beam impulse waveform, is limited
In the continuous saturation power of photodetector, the amplitude of huge compression narrow band light pulse is reduced the dynamic of signal by continuous trimmed book bottom
State scope, therefore the third method is also restrained in the concentration measurement in face of multiple beam light path.And on high power laser light
The report that device multiple beam WBFM impulse waveform concentrates measurement related only has optical fiber and laser coupled sampling aspect and broadband
The report of chirp waveform measurement.It is entitled《A kind of fiber-optic coupling method for high-power laser test system》China
Patent of invention（The patent No.：ZL200910215304.9）, describe coupling device under Near-Field Radar Imaging directional light；It is entitled《It is a kind of
WBFM pulse laser Waveform testing device》Chinese utility model patent（The patent No.：ZL201420652805.X）, description
Realize the measurement apparatus of single beam WBFM pulse laser waveform；Apparatus above can not realize unified beam shape simultaneously
Measurement and the measurement of multiple beam remote centralized.
The content of the invention
In order to overcome in the prior art in the multiple beam WBFM pulse laser waveform exported in face of large scale laser instrument
Concentration measurement when, it is impossible to while realize the deficiency of the measurement of unified beam shape and the measurement of multiple beam remote centralized, the present invention
A kind of multiple beam WBFM pulse laser waveform is provided and concentrates measurement apparatus.
Technical scheme is as follows
The multiple beam WBFM pulse laser waveform of the present invention concentrates measurement apparatus, is characterized in, described laser wave
Shape concentrates measurement apparatus to include optical-electrical-optical modular converter, optical fibre wavelength-division multiplex-switch module, the optical fiber arranged successively in light path
Be time-multiplexed module, fiber amplifier, photodetector, oscillograph, computer.Wherein, optical-electrical-optical modular converter contains light
Attenuator, lens, photoelectric tube, directly dim modulator.Optical fibre wavelength-division multiplex-switch module contains dense wave division multiplexer, optical fiber
Acoustooptic switch, dense wavelength division demultiplexer.Optical fibre time division Multiplexing module contains fiber delay time device, dense wave division multiplexer.
Described laser waveform is concentrated in the light path of measurement apparatus, tested each road of multiple beam WBFM pulse directional light
Light beam sequentially passes through optical attenuator, lens, and the photoinduction face for then impinging perpendicularly on photoelectric tube is converted into electric impulse signal.Electric arteries and veins
Rush the rf inputs that signal is output to straight light modulation modulator by cable.Straight light modulation modulator believes electric pulse in per beam optical path
Number it is modulated on the continuous optical signal in arrowband of different wave length and is exported by single-mode fiber respectively；Per the arrowband of beam different wave length
Continuous light is transmitted to the input of the corresponding wave band of dense wave division multiplexer, coupled, different wave length through single mode fiber long range
The continuous optical signal in each road into same root single-mode fiber export.The continuous optical signal of each road different wave length is opened into optical fiber acousto-optic
Close, be cut to the unified long pulse with certain pulsewidth and wash off, wherein modulated signal light be superimposed upon long pulse wash off on by single
Single-mode fiber exports.The long pulse of different wave length is washed off into dense wavelength division demultiplexer, and coupled, the long pulse of different wave length is washed off
Respectively by different single-mode fiber synchronism outputs to fiber delay time device.Each road long pulse is washed off passes through list after delay at equal intervals
Mode fiber enters the input of the corresponding wave band of dense wave division multiplexer, coupled, when being exported by single single-mode fiber with waiting
Between the serial long pulse pulsed light signal that postpones to fiber amplifier, after amplification, serial long pulse pulsed light signal is inputted by single-mode fiber
To photodetector, the electric signal of photodetector output enters oscillograph by cable, and oscillograph output data is then through netting twine
It is sent into computer and carries out data processing.
Each straight light modulation modulator output wavelength in the multiple beam light path is different, for meeting international communication alliance
Dense wave division multipurpose standard of wavelength.
The corresponding wave band of each input/output terminal and each light path of the dense wave division multiplexer, dense wavelength division demultiplexer
Straight light modulation modulator output wavelength matches, for meeting the dense wave division multipurpose standard of international communication alliance.
The optical fiber acoustooptic switch output waveform 0.5dB width is more than modulated signal waveform bottom width；Optical fiber acousto-optic is opened
Close 3dB frequency responses width and be more than dense wave division multipurpose standard ITU Grid centre wavelengths intervals and the product of multiple beam beam number.
The fiber amplifier 3dB frequency responses width is more than dense wave division multipurpose standard ITU Grid centre wavelengths interval
With the product of multiple beam beam number.
The pulse delay of the fiber delay time device is more than optical fiber acoustooptic switch output waveform bottom width.
The multiple beam WBFM pulse laser waveform of the present invention concentrates the photoelectric tube output electric pulse letter in measurement apparatus
Number power is less than straight light modulation modulator and inputs 1 dB compression points；Straight light modulation modulators modulate band is wider than photoelectric tube responsive bandwidth；
Photoelectric tube output impedance meets matches impedances principle with straight light modulation modulator input impedance；Straight light modulation modulator in each light path
Output wavelength is different, meets dense wave division multipurpose standard of wavelength (the ITU Grid of international communication alliance (ITU): 200GHz/
100GHz Spacing)；Each band of channles of dense wave division multiplexer/demultiplexer directly dims modulator output wavelength with each light path
Match, meet dense wave division multipurpose standard (the ITU Grid of international communication alliance (ITU): 200GHz /100GHz
Spacing)。
The multiple beam WBFM pulse laser waveform of the present invention concentrates measurement apparatus to have a high reliability, information can grow away from
Transmitted from optical fiber, the concentration of multiple beam WBFM pulse laser waveform is realized by optical fiber wavelength division-time multiplexed transmission technology
Measurement, the operating cost of system can be effectively reduced, especially suitable for the large-scale device of high power laser WBFM arteries and veins of a lot of beam
Rush the concentration measurement of time waveform.
Brief description of the drawings
Fig. 1 is that the multiple beam WBFM pulse laser waveform of the present invention concentrates the principle schematic of measurement apparatus；
Fig. 2 is the principle schematic of the optical-electrical-optical modular converter in the present invention；
Fig. 3 is the principle schematic of optical fibre wavelength-division multiplex-switch module in the present invention；
Fig. 4 is the principle schematic of the optical fibre time division Multiplexing module in the present invention.
In figure, 1. 2. optical fibre wavelength-division multiplexes of the optical-electrical-optical modular converter-optical fibre time division Multiplexing module of switch module 3.
4. the photoelectric tube of 9. lens of fiber amplifier 5. photodetection, 6. oscillograph, 7. computer, 8. optical attenuator 10.
11. the directly dense wavelength division demultiplexer of 13. optical fiber acoustooptic switch of light modulation 12. dense wave division multiplexer of modulator 14.
15. the dense wave division multiplexer of fiber delay time device 16..
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples, but should not limit the present invention's with this
Protection domain.
Embodiment 1
Fig. 1 is that the multiple beam WBFM pulse laser waveform of the present invention concentrates the principle schematic of measurement apparatus, and Fig. 2 is
The principle schematic of optical-electrical-optical modular converter in the present invention, Fig. 3 are optical fibre wavelength-division multiplex-switch module in the present invention
Principle schematic, Fig. 4 are the principle schematic of the optical fibre time division Multiplexing module in the present invention.
In Fig. 1~Fig. 4, multiple beam WBFM pulse laser waveform of the invention concentrates measurement apparatus, including light path
In optical-electrical-optical modular converter 1, optical fibre wavelength-division multiplex-switch module 2, optical fibre time division Multiplexing module 3, the optical fiber arranged successively put
Big device 4, photodetector 5, oscillograph 6, computer 7.Wherein, optical-electrical-optical modular converter 1 containing optical attenuator 8, lens 9,
Photoelectric tube 10, straight light modulation modulator 11.Optical fibre wavelength-division multiplex-switch module 2 is opened containing dense wave division multiplexer 12, optical fiber acousto-optic
Close 13, dense wavelength division demultiplexer 14.Optical fibre time division Multiplexing module 3 contains fiber delay time device 15, dense wave division multiplexer 16.
Described laser waveform is concentrated in the light path of measurement apparatus, tested each road of multiple beam WBFM pulse directional light
Light beam sequentially passes through optical attenuator 8, lens 9, and the photoinduction face for then impinging perpendicularly on photoelectric tube 10 is converted into electric impulse signal.
Electric impulse signal is output to the rf inputs of straight light modulation modulator 11 by cable.Straight light modulation modulator 11 will in per beam optical path
Electric impulse signal is modulated on the continuous optical signal in arrowband of different wave length and exported by single-mode fiber respectively.Per Shu Butong ripples
The continuous light in long arrowband is transmitted to the input of 12 corresponding wave band of dense wave division multiplexer, through coupling through single mode fiber long range
Close, the continuous optical signal in each road of different wave length exports into same root single-mode fiber.The continuous optical signal of each road different wave length enters
Enter optical fiber acoustooptic switch 13, be cut to the unified long pulse with certain pulsewidth and wash off, wherein modulated signal light is superimposed upon long pulse
Exported on washing off by single single-mode fiber.The long pulse of different wave length is washed off into dense wavelength division demultiplexer 14, coupled, no
The long pulse of co-wavelength is washed off respectively by different single-mode fiber synchronism outputs to fiber delay time device 15.Each road long pulse wash off through etc.
Enter the input of 16 corresponding wave band of dense wave division multiplexer after the delay of spacing by single-mode fiber, it is coupled, by single
Single-mode fiber output with etc. time delay serial long pulse pulsed light signal to fiber amplifier 4, after amplification, serial long pulse is washed off
Signal is inputted to photodetector 5 by single-mode fiber, and the electric signal that photodetector 5 exports enters oscillograph 6 by cable,
The output data of oscillograph 6 is then sent into computer 7 through netting twine and carries out data processing, realizes the cutting of long pulse waveform series, and
The separation of long pulse signal data and modulated pulse signal data, due to modulated pulse signal waveform and WBFM impulse waveform
Unanimously, so as to obtaining multiple beam WBFM impulse waveform.
Each straight light modulation modulator 11 output wavelength in the multiple beam light path is different, for meeting international communication alliance
Dense wave division multipurpose standard of wavelength.
Each input of the dense wave division multiplexer 12, dense wave division multiplexer 16 and dense wavelength division demultiplexer 14/
The corresponding wave band of output end directly dims the output wavelength of modulator 11 with each light path and matched, for meeting the close of international communication alliance
Collect wavelength-division multiplex standard.
The output waveform 0.5dB width of optical fiber acoustooptic switch 13 is more than modulated signal waveform bottom width；Optical fiber acousto-optic
The 3dB frequency responses width of switch 13 is more than dense wave division multipurpose standard ITU Grid centre wavelengths intervals and multiple beam beam number
Product.
The 3dB frequency responses width of the fiber amplifier 4 is more than dense wave division multipurpose standard ITU Grid centre wavelengths
Interval and the product of multiple beam beam number.
The pulse delay of the fiber delay time device 15 is more than the output waveform bottom width of optical fiber acoustooptic switch 13.
In the present invention, tested high power WBFM pulse collimated light beam is assembled by optical attenuator 8, lens 9, and full mouth
Footpath beam orthogonal is incident to be simultaneously full of the photoinduction face of photoelectric tube 10, output electric pulse as modulated signal by high speed cable input to
The straight light modulation rf inputs of modulator 11, the straight modulator 11 that dims exports the continuous optical signal in arrowband by single-mode fiber, wherein wrapping
Containing corresponding modulated pulse signal light.Straight light modulation modulator 11 inputs modulation signal power and is less than its input 1 dB compressions
Point；The straight light modulation modulation bandwidth of modulator 11 is more than the responsive bandwidth of photoelectric tube 10；Photoelectric tube 10 exports terminal impedance and modulated with straight light modulation
Device 11 is modulated input impedance and matched；The continuous light that directly light modulation modulator 11 exports in each light path has different wave length, meets ITU
Grid:C-Band, 200GHz Spacing dense wave division multipurpose standards of wavelength, as shown in Figure 2.
In the present invention, the continuous optical signal in arrowband of each road different wave length, transmitted through single-mode fiber to dense wave division multiplexer
The input of 12 corresponding wave bands, coupled, the continuous optical signal in each road of different wave length exports into same root single-mode fiber, defeated
Light extraction enters optical fiber acoustooptic switch 13, and the continuous optical signal of each wavelength is cut to the unified long pulse with certain pulsewidth and washed off,
Wherein modulated pulse signal optical superposition is exported to dense wavelength division demultiplexer on long pulse is washed off, and by single single-mode fiber
14, coupled, the long pulse of different wave length is washed off respectively by the output end of 14 corresponding wave band of dense wavelength division demultiplexer by not
With root single-mode fiber synchronism output.Each input/output end port wave band of the demultiplexer 14 of dense wave division multiplexer 12/ and each light path
The straight light modulation output wavelength of modulator 11 matches, and meets dense wave division multipurpose ITU Grid: C-Band, 200GHz
Spacing；The continuous luminous power of multi-wavelength of the simple optical fiber of dense wave division multiplexer 12 output is less than dense wave division multiplexer 12 most
Big thang-kng power；The output waveform 0.5dB width of optical fiber acoustooptic switch 13 is more than modulated pulse signal waveform bottom width；Optical fiber sound
The 3dB frequency responses width of photoswitch 13 is more than dense wave division multipurpose standard ITU Grid centre wavelengths intervals and multiple beam beam number
Product, as shown in Figure 3.
In the present invention, the long pulse of different wave length is washed off is synchronously input to fiber delay time device 15 by different single-mode fibers,
Each road long pulse is washed off enters 16 corresponding wave band of dense wave division multiplexer after delay at equal intervals by each road single-mode fiber
Input, it is coupled, exported by single single-mode fiber series.The wave band of 16 each input port of dense wave division multiplexer and each light path
The straight light modulation output wavelength of modulator 11 matches, and meets ITU Grid: C-Band, 200GHz Spacing；Fiber delay time device
Jian15Ge roads pulse delay is more than long pulse waveform bottom width, as shown in Figure 4.
In the present embodiment, using tested WBFM pulse collimated laser beam bore as D=50mm, 1Hz, 1053nm, 3ns side
Ripple；
Fiber amplifier 4 uses erbium-doped fiber amplifier, centre wavelength 1550nm, linear gain bandwidth 20nm, linearly
Gain is 20dB；The model of photodetector 5：Newfocus 1554B, bandwidth 12G, CW saturation power：1mW, output resistance
It is anti-：；The parameter of cable bandwidth is：18G；The parameter of oscillograph 6 is：Bandwidth 8G, input impedance：.
The focal length of lens 9 is=300mm；The photoinduction face bore of photoelectric tube 10 is d=10mm, bandwidth：6G, output impedance：；Respectively
Directly light modulation modulator 11 uses DFB semiconductor laser, modulation bandwidth in light path>10G, modulate input impedance：, output wavelength is each
Light path is different from each other, is satisfied by ITU Grid:C-Band, C20-C66,200GHz Spacing standards of wavelength.
The parameter of dense wave division multiplexer 12 and dense wavelength division demultiplexer 14 is：24 passages, ITU Grid: C-Band,
C20-C66,200GHz Spacing, passage insertion loss are 5.5dB, and maximum thang-kng power is 300mW；Optical fiber acoustooptic switch 13
Parameter be：Output waveform 0.5dB width 40ns, it is 30ns to rise (declines) edge, bottom width 100ns, 3dB frequency response
Width is 20nm.
The parameter of fiber delay time device 15 is：24 optical-fibre channels, each passage equidistant time delay are 120ns；Intensive ripple
The parameter of division multiplexer 16 is：24 passages, ITU Grid:C-Band, C20-C66,200GHz Spacing.
The measurement process of the present invention is as follows
First, according to tested each light path WBFM pulse collimated laser beam bore, the focal length of lens 9 and the light sensation of photoelectric tube 10
The face caliber size of answering determines the distance between lens 2 and the photosurface of photoelectric tube 3 h；
In Fig. 2：Incident parallel optical port footpath is D, and the emergent light arbitrary section bore of lens 9 is：, in order to protect
Demonstrate,prove unified incident light and fully enter the photoinduction face of photoelectric tube 10, beam cross section bore must is fulfilled at photoinduction face；
On the other hand in order to ensure that incident beam is full of the photoinduction face of photoelectric tube 10, the beam cross section bore at photoinduction face as much as possible
The photoinduction face of must be close to caliber size, due to d=10mm in this example, when, then lens 9 and photoelectric tube 10 are photosensitive
The distance between face is：, therefore,。
According to directly the dB of input 1 of light modulation modulator 11 compresses point value to determine each light path incident light pulse through photoelectricity in Fig. 2
The maximum amplitude value of output electric pulse signal after the opto-electronic conversion of pipe 10；
Input 1 dB compression points and be defined as modulator radio-frequency head input peak power.In the present embodiment：Each light path directly dims
The dB of input 1 of modulator 11 compresses point value：20dbm, i.e.,, faceModulation input impedance,
Then range value corresponding to 100mW input power is, therefore, the spiking output amplitude of photoelectric tube 10
It is worth for 2.24V.
According to the linear gain bandwidth of fiber amplifier 4, the 3dB frequency responses width of optical fiber acoustooptic switch 13 and intensive
Wavelength-division multiplex standard ITU Grid centre wavelengths intervals measure beam number to determine that multiple beam is concentrated.
In the present embodiment, the 3dB frequency responses width of optical fiber acoustooptic switch 13 is 20nm, the linear increasing of fiber amplifier 4
Benefit meets ITU Grid with a width of 20nm, dense wave division multipurpose standard ITU Grid centre wavelengths interval:200GHz (1.6nm),
Therefore it is 12 beams that multiple beam, which concentrates measurement beam number,.
Analyzed more than, choose in Fig. 2 lens 9 to the distance between the photosurface of photoelectric tube 10 h=250mm, then photosurface
Upper spot size is, it is ensured that unified light beam enters photoelectric tube 10 and is full of photoinduction face as far as possible；Each light path is directly adjusted
The modulation input impedance of optical modulator 11 and the output impedance of photoelectric tube 10 are, meet impedance matching principle；Straight light modulation is adjusted
The band of device 11 processed is wider than the bandwidth of photoelectric tube 10；By selecting the decay multiplying power of optical attenuator 8 so that the output electric pulse width of photoelectric tube 10
Angle value is less than the dB of the input 1 compression point values of straight light modulation modulator 11.
The centre wavelength of fiber amplifier 4 is 1550nm in optical fiber acoustooptic switch 13 and Fig. 1 in Fig. 3, and multiple beam is concentrated
It is 12 beams to measure beam number, therefore it is ITU Grid to choose the straight light modulation output wavelength of modulator 11 in each light path:C22-C44 light
Beam enters waveband channels corresponding to dense wave division multiplexer 12；The output waveform 0.5dB width 40ns of optical fiber acoustooptic switch 13 is more than
Measured pulse width 3ns.
Each passage equidistant time delay of fiber delay time device 15 is that 120ns is more than optical fiber acoustooptic switch in Fig. 3 in Fig. 4
13 output waveform bottom width 100ns.
Directly the bias current of light modulation modulator 11 is arranged to 75mA ~ 100mA, passage insertion in each light path in the present embodiment
It is lost as 5.5dB, it be 12 beams to concentrate measurement beam number, with the continuous output work of Fiber Dynamometer test dense wave division multiplexer 12
Rate, if power output be more than dense wave division multiplexer 12 maximum thang-kng power, Ze Ge roads directly dim modulator 11 output with
Dense wave division multiplexer 12 adds variable fibre optic attenuator between inputting so that the optical fiber output power of dense wave division multiplexer 12
Less than its maximum thang-kng power.
In the present embodiment, the output impedance of photodetector 5 is to meet impedance matching with the passage input impedance of oscillograph 6
Principle.Then the output electric signal of photodetector 5 enters oscillograph 6 by cable, and the test data of oscillograph 6 passes through netting twine and is sent into meter
The processing of the Develop Data of calculation machine 7, each road light beam long pulse waveform reference time delay 120ns is subjected to data cutting, and long pulse
The separation rushed between Wave data and modulated pulse signal data, due to modulated pulse signal waveform and WBFM impulse waveform
Unanimously, so as to obtaining multiple beam WBFM impulse waveform.
Therefore, realize that broadband is adjusted by the way that photoelectric tube is combined with the direct modulation technique based on DFB semiconductor laser
Frequency pulses switch is that narrow-band impulse carries out waveform measurement, and realizes that multiple beam signal passes using optical fiber wavelength division-time-division multiplex technology
It is defeated, it on the one hand can overcome unified beam shape measurement and the contradiction of measurement signal long-distance transmissions, on the other hand can be real
The remote centralized measurement of multiple beam in the existing a lot of large-scale device of high power laser of beam.
Optical attenuator 8 is using 1053nm heat absorbing glass in Fig. 2, the attenuator equipped with differential declines multiplying power, each attenuator
Switching can be independently passed in and out in the optical path；Lens 9 are made using optically transparent material；The lens mirror holder can horizontal, longitudinal direction tune
Section；Photoelectric tube 10 is placed on four-dimensional adjusting bracket, can horizontal, longitudinal direction and angular adjustment.
Claims (6)
1. a kind of multiple beam WBFM pulse laser waveform concentrates measurement apparatus, it is characterized in that：Described laser waveform is concentrated
Measurement apparatus includes the optical-electrical-optical modular converter arranged successively in light path（1）, optical fibre wavelength-division multiplex-switch module（2）, optical fiber
Be time-multiplexed module（3）, fiber amplifier（4）, photodetector（5）, oscillograph（6）, computer（7）；Wherein, optical-electrical-optical
Modular converter（1）Contain optical attenuator（8）, lens（9）, photoelectric tube（10）, directly dim modulator（11）；Optical fibre wavelength-division multiplex-
Switch module（2）Contain dense wave division multiplexer（12）, optical fiber acoustooptic switch（13）, dense wavelength division demultiplexer（14）；Optical fiber
Be time-multiplexed module（3）Contain fiber delay time device（15）, dense wave division multiplexer（16）；
Described laser waveform is concentrated in the light path of measurement apparatus, tested each road light beam of multiple beam WBFM pulse directional light
Sequentially pass through optical attenuator（8）, lens（9）, then impinge perpendicularly on photoelectric tube（10）Photoinduction face be converted into electric pulse letter
Number；Electric impulse signal is output to straight light modulation modulator by cable（11）Rf inputs；Straight light modulation modulation in per beam optical path
Device（11）Electric impulse signal is modulated at respectively on the continuous optical signal in arrowband of different wave length and exported by single-mode fiber；Often
The continuous light in arrowband of beam different wave length is transmitted to dense wave division multiplexer through single mode fiber long range（12）Corresponding wave band it is defeated
Enter end, coupled, the continuous optical signal in each road of different wave length exports into same root single-mode fiber；Each road different wave length it is continuous
Optical signal enters optical fiber acoustooptic switch（13）, it is cut to the unified long pulse with certain pulsewidth and washes off, wherein modulated signal light
Be superimposed upon long pulse wash off on exported by single single-mode fiber；The long pulse of different wave length is washed off into dense wavelength division demultiplexer
（14）, coupled, the long pulse of different wave length is washed off respectively by different single-mode fiber synchronism outputs to fiber delay time device（15）；
Each road long pulse is washed off enters dense wave division multiplexer after delay at equal intervals by single-mode fiber（16）Corresponding wave band it is defeated
Enter end, it is coupled, by the output of single single-mode fiber with etc. time delay serial long pulse pulsed light signal to fiber amplifier
（4）, after amplification, serial long pulse pulsed light signal is inputted to photodetector by single-mode fiber（5）, photodetector（5）Output
Electric signal oscillograph is entered by cable（6）, oscillograph（6）Output data is then sent into computer through netting twine（7）Carry out data
Processing.
2. multiple beam WBFM pulse laser waveform according to claim 1 concentrates measurement apparatus, it is characterized in that：It is described
Each straight light modulation modulator in multiple beam light path（11）Output wavelength is different.
3. multiple beam WBFM pulse laser waveform according to claim 1 concentrates measurement apparatus, it is characterized in that：It is described
Dense wave division multiplexer（12）, dense wave division multiplexer（16）And dense wavelength division demultiplexer（14）Each input/output terminal
Corresponding wave band directly dims modulator with each light path（11）Output wavelength matches.
4. multiple beam WBFM pulse laser waveform according to claim 1 concentrates measurement apparatus, it is characterized in that：It is described
Optical fiber acoustooptic switch（13）Output waveform 0.5dB width is more than modulated signal waveform bottom width；Optical fiber acoustooptic switch（13）3dB
Frequency response width is more than dense wave division multipurpose standard ITU Grid centre wavelengths intervals and the product of multiple beam beam number.
5. multiple beam WBFM pulse laser waveform according to claim 1 concentrates measurement apparatus, it is characterized in that：It is described
Fiber amplifier（4）3dB frequency responses width is more than dense wave division multipurpose standard ITU Grid centre wavelengths intervals and multiple beam
The product of beam number.
6. multiple beam WBFM pulse laser waveform according to claim 1 concentrates measurement apparatus, it is characterized in that：It is described
Fiber delay time device（15）Pulse delay be more than optical fiber acoustooptic switch（13）Output waveform bottom width.
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| CN111164457B (en) * | 2018-09-07 | 2023-04-14 | 深圳市大疆创新科技有限公司 | Laser ranging module, device and method and mobile platform |
| CN109596229A (en) * | 2018-12-14 | 2019-04-09 | 中国工程物理研究院激光聚变研究中心 | A kind of nanosecond pulse laser waveform measurement method |
| CN111585927B (en) * | 2020-05-08 | 2022-05-17 | 南京大学 | Frequency modulation demodulation system and signal processing method |
| CN113049121B (en) * | 2021-04-07 | 2022-03-25 | 中国空气动力研究与发展中心超高速空气动力研究所 | Device and method for measuring pulse laser flash time |
| 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 |
| CN113612541B (en) * | 2021-09-09 | 2022-09-30 | 北京电子工程总体研究所 | TDOA-based target analog signal photon link transmission delay measuring device |
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