CN103296568B - Pulse fiber laser acoustic optical modulator driving power source - Google Patents
Pulse fiber laser acoustic optical modulator driving power source Download PDFInfo
- Publication number
- CN103296568B CN103296568B CN201310231352.3A CN201310231352A CN103296568B CN 103296568 B CN103296568 B CN 103296568B CN 201310231352 A CN201310231352 A CN 201310231352A CN 103296568 B CN103296568 B CN 103296568B
- Authority
- CN
- China
- Prior art keywords
- circuit
- power
- pulse
- signal
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
Abstract
The invention provides a pulse fiber laser acoustic optical modulator driving power source which is characterized by comprising a high frequency oscillator, a 2ASK keying modulator circuit, a preamplifier, a power amplification circuit, a controller circuit, a pulse sharpening circuit and an output matching network. The high frequency oscillator is used for generating high-frequency carrier signals, the pulse sharpening circuit receives modulation pulse input signals from the outside to perform sharpening processing on the signals, and the signals performed with sharpening processing are input into the controller circuit for adjusting. The 2ASK keying modulation circuit performs amplitude modulation on the high-frequency carrier signals generated by the high-frequency oscillator through input pulse signals modulated by the controller circuit. The preamplifier is used for performing amplitude amplification on the modulated signals modulated by the 2ASK keying modulation circuit, then the power amplification circuit performs power amplification on the modulated signals, and the output matching network performs filtering and impedance matching on the signals and outputs the signals to drive an acoustic optical modulator to work.
Description
Technical field
The present invention relates to pulsed fiber lasers device.Specifically, the present invention relates to a kind of driving power of pulse optical fiber acousto-optic modulator.
Background technology
Laser because of its there is good directionality, high brightness, the advantage such as coherence is good, monochromaticjty is good, by deep research with apply widely, become one of science and technology achievement attracted most attention in 20th century.The appearance of laser technology and development make optics science and optical technology be developed, and excite emerging industry---laser processing flourish.Along with the development of laser technology, pulse optical fiber is applied in middle low power field of laser processing more and more widely due to the performance of its brilliance, utilize acoustooptic modulation effect can control repetition rate, the peak power of laser pulse fast and effectively, thus meet the special requirement of field of laser processing to a greater degree.Acousto-Optic Modulator Driver is the pith in pulse optical fiber, how to improve the key factor becoming with the performance index improving drive circuit and determine Output of laser quality.Therefore, carry out research and the design of Acousto-Optic Modulator Driver, there is very important using value and wide development space.
The feature of the nonlinear effect utilizing optical fiber to have, or a kind of high reliability solid state laser using optical fiber (some special rare earth elements of wherein adulterating) to develop as working media, i.e. fiber laser.Now, most of fiber lasers that market is sold, its pump light source is made up of semiconductor laser.Namely the pump light with a certain specific wavelength of input is transformed to the laser of the specific wavelength of actual needs by the operation principle of fiber laser by fiber amplifier technology, from this one side of beam quality relatively, fiber laser exceeds much than semiconductor laser and gas laser.
Along with developing by leaps and bounds of Q-regulating technique, a kind of fiber laser with high-peak power has come out, i.e. pulse optical fiber.It has the advantage of following uniqueness: light-light conversion efficiency is high, " surface area/volume " is high, without the need to complexity water-cooling system, simply air-cooled can, that the laser beam of rapid heat dissipation, outputting high quality, system have extreme high reliability, product compact is easy to large scale system is integrated etc.Current, the advantage had because of itself, pulse optical fiber obtains develop rapidly in every field, such as biologic medical and image display arts, particularly in field of laser processing as mark, coding, drawing, welding, punching, cutting etc.
Acoustooptic modulation technology is a kind of Q-regulating technique be widely used, the driving power of its critical piece---acousto-optic modulator is the important component part in pulse optical fiber, how to improve the key factor becoming with the performance index improving driving power and determine quality for outputting laser beam.Therefore, carry out research and the design of Acousto-Optic Modulator Driver, there is very important using value and wide development space.
As a kind of pulse optical fiber, the fiber laser of MOPA structure can obtain the pulse laser of pulsewidth nanosecond order by optical-fiber type acousto-optic Q modulation mode, and export average power higher, peak power even can reach megawatt magnitude.The advantage had due to itself, MOPA structured optical fiber laser is widely used in the fields such as industry, military affairs, medical science.Optical-fiber type acousto-optic modulator is part important in MOPA structured optical fiber Optical Maser System, has high switching response speed and high efficiency optical-fiber type Acousto-Optic Modulator Driver has important practical significance so develop.
Therefore, a kind of driving power with high switching response speed and high efficiency optical-fiber type acousto-optic modulator is needed.
Summary of the invention
The object of the invention is to realize one and there is high switching response speed and high efficiency optical-fiber type Acousto-Optic Modulator Driver, improve the diffraction efficiency of optical-fiber type acousto-optic modulator, meet the requirement of MOPA structured optical fiber Optical Maser System, improve the beam quality of output laser pulse.
The invention provides a kind of pulse optical fiber Acousto-Optic Modulator Driver, it is characterized in that described driving power comprises high-frequency generator, 2ASK keying modulation circuit, preamplifier, power amplification circuit, controller circuitry, pulse steeping circuit and output matching network, described high-frequency generator, for generation of high-frequency carrier signal, is made up of sine wave oscillation circuit and series connection frequency-selective network; The modulating pulse input signal that described pulse steeping circuit receives from outside carries out steepness process to it, and for steepness modulated pulse signal and filtered signal spike, the signal after steepness process is input to described controller circuitry and regulates; Described controller circuitry is used for the signal after the process of described pulse steeping circuit steepness to carry out voltage amplitude adjustment; Described 2ASK keying modulation circuit carries out amplitude modulation(PAM) by the pulse signal regulated through described controller circuitry of input to the high-frequency carrier signal that described high-frequency generator produces; Described preamplifier is used for the modulation signal after described 2ASK keying modulation circuit modulation to carry out amplitude amplification; Described power amplification circuit is used for the signal after described preamplifier amplitude amplification to carry out power amplification; Described output matching network exports after being used for that the modulation signal after described power amplification circuit amplification is carried out filtering and impedance matching, thus drives the work of described acousto-optic modulator.
Preferably, described high-frequency generator produces by active integrated crystal oscillator the standard frequency carrier signal that centre frequency is 100MHz.
Preferably, the supply power voltage of described driving power is direct current+24V, and operating frequency is 100MHz, and modulating frequency is 20kHz ~ 200kHz, and power output is 2W.
Preferably, the modulating frequency that described 2ASK keying modulation circuit carries out amplitude modulation(PAM) to carrier signal is 20kHz ~ 200kHz.
Preferably, described power amplification circuit comprises category-A and the hybrid two-stage amplifying circuit of C class.
Preferably, described power amplification circuit comprises the radio frequency power tube that model is MRF158.
Preferably, described power stage matching network is L-type matching network.
Preferably, described L-type matching network is by first filter capacitor of connecting successively configured at input and output respectively, the first inductance and the second filter capacitor, and one end is connected between the first filter capacitor and the first inductance, the first electric capacity composition of other end ground connection.
Preferably, described power stage matching network is π type matching network.
Preferably, described π type matching network is by the 3rd filter capacitor of connecting successively configured at input and output respectively, the second inductance and the 4th filter capacitor, one end is connected between the 3rd filter capacitor and the second inductance, second electric capacity of other end ground connection, and one end is connected between the second inductance and the 4th filter capacitor, the 3rd electric capacity composition of other end ground connection.
According to the driving power of pulse optical fiber acousto-optic modulator of the present invention, systematic technical indicator requirement can be met, not only reduce the switching response time of driving power, also substantially increase the efficiency of power output stage, the MOPA structured optical fiber laser dominated at present for laser marking industry provides the optical-fiber type Acousto-Optic Modulator Driver of stable performance.
Should be appreciated that description and the follow-up detailed description of aforementioned cardinal principle are exemplary illustration and explanation, should not be used as the restriction to the claimed content of the present invention.
Accompanying drawing explanation
Describe above and other aspect of the present invention by reference to the accompanying drawings in detail, in accompanying drawing:
Fig. 1 is the general frame according to optical-fiber type Acousto-Optic Modulator Driver of the present invention;
Fig. 2 is according to high-frequency generator device schematic diagram of the present invention;
Fig. 3 is according to pulse steeping circuit theory diagrams of the present invention;
Fig. 4 (a) is the first implementation according to 2ASK keying modulation circuit of the present invention;
Fig. 4 (b) is the second implementation according to 2ASK keying modulation circuit of the present invention;
Fig. 5 is according to preamplifier schematic diagram of the present invention;
Fig. 6 is according to power amplification circuit schematic diagram of the present invention;
Fig. 7 (a) is according to L-type power stage matching network circuit schematic diagram of the present invention;
Fig. 7 (b) is according to π type power stage matching network circuit schematic diagram of the present invention;
Fig. 8 is the Smith circle diagram of rated output output matching network.
Hereinafter, embodiments of the invention will be described with reference to the drawings.In the accompanying drawings, identical Reference numeral represents same or similar parts, or same or similar step.
Embodiment
By reference to one exemplary embodiment, object of the present invention and function and the method for realizing these objects and function will be illustrated.But the present invention is not limited to following disclosed one exemplary embodiment; Can be realized it by multi-form.The essence of specification is only help various equivalent modifications Integrated Understanding detail of the present invention.
The present invention is based on the fiber laser acoustooptic modulation technology of seed pulse master oscillation power amplification (MOPA) formula structure, according to parameter characteristic and the technical requirement of optical-fiber type acousto-optic modulator, achieve the driving power scheme of a kind of low-power consumption, acousto-optic modulator that stable output power is adjustable.
overall plan
According to the driving power circuit system block diagram of fiber laser acousto-optic modulator of the present invention as shown in Figure 1.The driving power 100 of fiber laser acousto-optic modulator is made up of high-frequency generator 101,2ASK keying modulation circuit 102, preamplifier 103, power amplification circuit 104, controller circuitry 105, pulse steeping circuit 106 and output matching network 107.This driving power 100 can provide the constant-amplitude carrier signal with characteristic frequency and the pulse amplitude modulation signal with certain modulation bandwidth.First modulating pulse input signal is input to pulse steeping circuit 106 through steepness process, then via controller circuit 105 is input to 2ASK keying modulation circuit 102, is input to 2ASK keying modulation circuit 102 and carries out amplitude modulation(PAM) together with the high-frequency carrier signal that high-frequency generator 101 produces.Modulation signal after modulation, after preamplifier 103 carries out amplitude amplification, is input to power amplification circuit 104 and carries out power amplification.Modulation signal after the amplification exported carries out filtering and impedance matching through output matching network 107, and guaranteed output amplifying circuit 104 Maximum Power Output, finally carries out power stage, be input to acousto-optic modulator by modulation signal, drives acousto-optic modulator work.
Particularly, the standard frequency carrier signal of the effect of high-frequency generator 101 to be generation centre frequencies be 100MHz.Pulse steeping circuit 106 is for steepness modulated pulse signal and filtered signal spike.Controller circuitry 105 makes the modulation depth of amplitude-modulated signal and gain can carry out suitable adjustment according to the requirement of the characteristic of acousto-optic modulator and user.The pulse signal that 2ASK modulation circuit 102 is regulated by the via controller circuit 105 of input carries out amplitude modulation(PAM) to the high-frequency carrier signal that high-frequency generator 101 produces.Preamplifier 103 plays buffering and buffer action, certain voltage amplitude can be exported and send into power amplification circuit 104, this is because the amplitude-modulated signal amplitude after modulation is very little, can not driving power amplifying circuit 104, so need to carry out Linear Amplifer to this amplitude-modulated signal.Power amplification circuit 104 mainly carries out power amplification to the amplitude-modulated signal that preamplifier 103 exports, and provides enough drive singal to acousto-optic modulator.Owing to needing to add that matching network is to realize the maximum transmitted of power in the middle of power output stage and load, therefore after power amplification circuit, output matching network 107 is equipped with, achieve the maximum transmitted of power between power output stage and load, and make the impedance of load and the impedance matching of power output stage.
According to the characteristic of optical-fiber type acousto-optic modulator and the requirement of MOPA structured optical fiber Optical Maser System, generally the technical indicator such as power output, operating frequency, modulating frequency, modulated pulse signal rise time of optical-fiber type Acousto-Optic Modulator Driver be there are certain requirements.The modulation system of radio-frequency driven power supply is digital modulation, and the several main technical parameter of optical-fiber type Acousto-Optic Modulator Driver is as shown in the table.
| Technical parameter | Technical indicator |
| Supply power voltage | +24V(DC) |
| Operating frequency | 100MHz |
| Modulating frequency | 20kHz～200kHz |
| Power output | 2W (50 Ω load) |
| Frequency stability | 1×10-5/h |
| Pulse rise time | ≤10ns |
| Output power stability | ≤5％/h |
The technical parameter of table 1 optical-fiber type Acousto-Optic Modulator Driver
each several part circuit design and realization
1 high-frequency generator
The stability of high-frequency generator 101 determines the stability of acousto-optic modulator and driving power thereof.Its effect is mainly manifested in two aspects: for power amplification output circuit below provides sine wave signal and the frequency-selecting of stable single-frequency.The requirement of the electrical resonance frequency of the acousto-optic modulator selected according to the present invention, uses 100MHz as the carrier frequency of driving power.The high-frequency generator circuit theory diagrams that the present invention selects as shown in Figure 2.
Consider the factor such as design difficulty, signal stabilization, present invention employs active integrated crystal oscillator to produce the sine wave of the 100MHz required for system.Under this crystal oscillator is operated in+5V voltage, its stability is better than 1 × 10
-5.As shown in Figure 2, it is made up of two parts the high-frequency generator circuit theory diagrams that the present invention selects: sine wave oscillation circuit 201 and series connection frequency-selective network 202.Sine wave oscillation circuit 201 comprises the electric capacity C1, inductance L 1 and the electric capacity C2 that are connected in series, an electric capacity C2 crystal oscillator TCXO in parallel, the output OUT3 of crystal oscillator TCXO is connected to the series connection frequency-selective network 202 be made up of the electric capacity C3 connected and inductance L 2, produces final output first-harmonic.Sine wave oscillation circuit 201 produces the sine wave of a 100MHz containing multiple harmonic, and this sine wave is by after series connection frequency-selective network 202, and secondary or high order harmonic component are inhibited, and export first-harmonic, i.e. the single frequency sinusoidal ripple of 100MHz.The preferred value of each electric capacity, inductance element as shown in Figure 2.
2 pulse steeping circuit
The schematic diagram of pulse steeping circuit 106 as shown in Figure 3.Modulated pulse signal is through transmission line input queued switches power-supply system, and due to the noise that has been coupled in transmitting procedure, and waveform is also bad, and especially rising edge is not fine, therefore needs to carry out shaping pulse to modulated pulse signal.The pulse modulation of system requirements 100 ﹪, had both required when turning off, and made an immediate response and exported without high-frequency signal, required again when opening, and response has high-frequency signal to export rapidly.According to this requirement, must steepness modulated pulse signal.Modulated pulse signal is after pulse steeping circuit, and waveform obtains shaping, and noise is suppressed, and rising edge becomes precipitous.Show after tested, output pulse signal is after pulse steeping circuit 106 processes, and waveform rising time reduces.According to preferred version of the present invention, pulse steeping circuit 106 inputs positive NAND gate IC SN74LS00 by four tunnels 2 of Texas Instrument (TI) and realizes.Shunt capacitance C4 and electric capacity C5 on output VCC.Four tunnels 2 input positive NAND gate realize logic be Y=(AB) or Y=A+B.The preferred value of each capacity cell as shown in Figure 3.
3 controller circuitrys
Controller circuitry 105 is for carrying out voltage amplitude adjustment by the signal after the process of pulse steeping circuit 106 steepness.Particularly, controller circuitry 105 makes the modulation depth of amplitude-modulated signal and gain can require suitably to regulate according to the characteristic of acousto-optic modulator and user, exports with the pulse laser reaching applicable customer requirement.Controller circuitry 105 adopts accurate adjustable resistance, is regulated the amplitude of the regulating impulse signal after steepness process by accurate adjustable resistance, realizes the adjustment of modulation depth to amplitude-modulated signal and gain.Preferably, controller circuitry 105 according to the present invention realizes by the resistance in the adjustable resistance be connected in series to be the three-prong adjustable resistance in 0-5K Europe and resistance be 1K Europe.
42ASK keying modulation circuit
After the high-frequency carrier signal of high-frequency generator 101 generation enters 2ASK keying modulation circuit 102, amplitude modulation(PAM) is carried out in the modulated pulse of carrier signal.When modulating pulse is high level signal, high-frequency carrier signal exports from modulation circuit smoothly; When modulating pulse is low level signal, high-frequency carrier signal just can not export from modulation circuit.In 2ASK keying modulation circuit 102 of the present invention, the pulse signal of available upper frequency carries out amplitude modulation(PAM) to carrier signal, and modulating frequency is 20kHz ~ 200kHz.The implementation of 2ASK keying modulation circuit 102 has following two kinds:
Modulation circuit as shown in Fig. 4 (a), modulated pulse signal carries out 2ASK modulation to high-frequency carrier signal after filter capacitor filtering, and after modulation, modulation signal oppositely compares after amplification through voltage comparator and exports.Particularly, as shown in Fig. 4 (a), the high-frequency carrier signal that high-frequency generator 101 produces is through V
oscillationend input, the pulse signal that controller circuitry 105 exports is through V
pulseend input, by V after 2ASK modulation
outputend exports.The preferred value of each components and parts is as shown in Fig. 4 (a).
The 2ASK realized by analog switch as shown in Fig. 4 (b) modulates.Modulated pulse signal 2ASK realized high-frequency carrier signal that cut-offs of control simulation switch 4066 after voltage follower time delay, voltage stabilizing circuit voltage stabilizing modulates.Particularly, as shown in Fig. 4 (b), the high-frequency carrier signal that high-frequency generator 101 produces is through V
oscillationend input, the pulse signal that controller circuitry 105 exports is through V
pulseend input, by V after 2ASK modulation
outputend exports.The preferred value of each components and parts is as shown in Fig. 4 (b).
5 preamplifiers
According to the circuit theory diagrams of preamplifier 103 of the present invention as shown in Figure 5.Amplitude-modulated signal amplitude after 2ASK keying modulation circuit 102 is modulated is very little, can not Direct driver power amplification circuit 104, therefore need carry out Linear Amplifer to this amplitude-modulated signal.Preamplifier 103 plays buffering and buffer action, can export certain voltage amplitude driving power amplifying circuit 104.For preamplifier 103, most importantly ensure amplitude-modulated signal to be amplified to certain amplitude, to supply the stable driving voltage of power amplification circuit 104.
According to the preferred embodiment of the present invention, preamplifier 103 is made up of operational amplifier U2, resistance R1, R2, R3, electric capacity C6, C7, C8 and C9.Annexation between each components and parts as shown in Figure 5.Amplitude-modulated signal after 2ASK keying modulation circuit 102 is modulated is input in operational amplifier U2 through resistance R1, and the output end vo ut by operational amplifier U2 after amplifying exports, to obtain amplitude amplifying signal.Preferably, operational amplifier adopts device AD8000, and the parameter characteristic of device AD8000 is as follows:
Bandwidth: 650MHz
-three dB bandwidth: 1580MHz
Operating voltage: 4.5V ~ 12V
Input offset voltage: 1mV
Low input current: 13.5mA
High input current: 100mA
Low input noise:
After the amplitude-modulated signal that amplitude is very little passes through preamplifier 103, after forward scale operation amplifies, its amplitude obtains amplification to a certain extent.Test shows, input pulse signal is after preamplifier 103 processes, and output waveform amplitude improves.
According to Fig. 5:
Can learn that the amplitude gain G of pre-amplification circuit is by (1):
6 power amplification circuits
According to the circuit theory diagrams of power amplification circuit of the present invention as shown in Figure 5.Carrier signal becomes pulse amplitude modulation signal after 2ASK keying modulation circuit 102, can driving power amplifying circuit 104 after preamplifier 103 amplitude is amplified.Power amplification circuit 104 mainly carries out power amplification to the signal that preamplifier 103 exports, and provides enough drive singal to acousto-optic modulator.Because under driving power works in high frequency and pulse modulation state at a high speed, therefore require very high to the bandwidth characteristic of power amplifier.
In order to the stable work in work of whole power-supply system, the efficiency of whole power supply and power output determine primarily of power amplification circuit 104.In power amplification circuit 104 design process, not only to consider the output waveform linearity, but also power output and efficiency will be considered.Therefore, power amplification circuit is designed to comprise category-A and the hybrid two-stage amplifying circuit of C class, then realizes output impedance coupling by π type output matching network.Particularly, as shown in Figure 6, category-A amplifying circuit is the biasing circuit be made up of R4 and R5, the π type impedance matching circuit of C10, C11, L3, R3, C12, C13 composition, and MRF158 power tube Q1 tri-part is formed; The π type impedance matching circuit that C class amplification circuit is made up of C14, C14, L4, R4, C12, C13, the filter circuit that C17, L6, C18, C19 are formed and MRF158 power tube Q2 tri-part are formed.The stricter high-frequency circuit manufacture craft such as power filter network, shielding selected by circuit board in manufacturing process.Driving power power output according to the present invention is 2W, output power stability≤5%/h.Power output due to power amplification circuit according to the present invention is 2W, and output impedance is 50 Ω.Therefore, in power amplification circuit according to the present invention, radio frequency power tube have selected MRF158.MRF158 has the performance of comparative superiority, and when 28V, 400MHz work, peak power output can reach 2W, and power gain reaches 16dB, and efficiency reaches 55%.In power amplification circuit design process, not only to consider the output waveform linearity, but also power output and efficiency will be considered.
According to the preferred embodiment of the present invention, the schematic diagram of two stage power amplifying circuit 104 as shown in Figure 6.One-level power amplification circuit is operated in category-A state, and secondary power amplifying circuit is operated in C state.Amplitude-modulated signal after preamplifier 103 amplitude is amplified is input in two stage power amplifying circuit 104 through Vin, is exported, to obtain the signal of power amplification after power amplification by output end vo ut.One group of concrete exemplary component parameter is as follows: C10=1uF, C11=10nF, L3=0.2uH, R3=1K, C12=1uF, C13=10nF, L5=0.2uH, R5=406, R6=47K, C16=23pF, C14=1uF, C15=10nF, L4=0.2uH, R4=1K, C17=100pF, C18=5pF, L6=0.2uH, R7=1k, L7=0.2uH, C19=100pF and C20=100pF.
The design and implimentation of 7 output matching networks
According to the theory of maximum transmission power, the energy exported to make power supply injection load as much as possible, needs to add power stage matching network 107 between power amplification circuit 104 and load, makes the impedance of load and the impedance matching of output stage.Impedance matching reflects the power delivery relation between output circuit and load.Same MOPA structured optical fiber laser Acousto-Optic Modulator Driver also needs impedance match technique.
The effect of power stage matching network 107 is as follows:
(1) impedance transformation: load impedance external for reality is converted to the optimum load required by power tube, with guaranteed output pipe Maximum Power Output.
(2) filtering higher harmonic components: the fully unwanted higher harmonic components of filtering, to ensure external load only inputs high frequency fundamental power.
(3) transmit energy expeditiously: the available signal power exported by power amplification circuit 104 is sent on external load expeditiously, namely require that circuit efficiency is close to 1.
In order to reach the impedance matching between optical-fiber type acousto-optic modulator (50 Ω) and driving power, need an impedance transducer here.For the output circuit of power amplification circuit 104, according to one embodiment of the invention, as shown in Fig. 7 (a), the present invention adopts L-type matching network to be mated.Described L-type matching network is by respectively at filter capacitor C21 and C23 that input and output configure, and inductance L 8 and electric capacity C22 are connected in parallel composition.In the L-type matching network such as shown in Fig. 7 (a), an exemplary set of pieces parameter value is: C21=100pF, C22=23pF, L8=0.1uH and C22=100pF.
According to another embodiment of the present invention, as shown in Fig. 7 (b), the present invention adopts π type matching network to be mated.Described π type matching network by respectively at filter capacitor C21 and C24 that input and output configure, and inductance L 3 and electric capacity C22, electric capacity C23 be connected in parallel composition.In the π type matching network such as shown in Fig. 7 (b), an exemplary set of pieces parameter value is: C21=100pF, C22=23pF, L3=0.1uH, C23=23pF and C24=100pF.
L-type matching network circuit has its outstanding advantages as the most frequently used matching network: be first simple and practical, because π type matching network and smith circle diagram combine, as long as mark the position of each impedance on Smith circle diagram accurately, just good matching effect can be obtained.Certainly also there is unpredictable parasitic parameter in actual applications, the impact of these parasitic parameters on impedance matching is very important.Therefore, the method only by Smith circle diagram can not meet design requirement, and also must do certain adjustment and could obtain good system index in experimentation.Smith circle diagram is by a circle of a lot of circumference weave in, and it mainly contains two parts composition: impedance chart and admittance chart, as shown in Figure 8.
Utilize Smith circle diagram to solve L-type matching network, what namely calculate the actual value of inductance and electric capacity in matching network generally comprises following step:
(1) normalization source impedance and load impedance is obtained.
(2) the conjugate complex number point of overload impedance in Smith circle diagram to draw etc. resistance circle or etc. conductance circle.
(3) find out (1) step and (2) step draw round intersection point.The number of intersection point is exactly the number of the L shape matching network that may exist.
(4) first along corresponding circle, source impedance point is moved to above-mentioned intersection point, and then move to the conjugate point of load along corresponding circle, just can obtain the normalized value of inductance and electric capacity according to this twice moving process.
(5) according to the actual value of given operating frequency determination inductance and electric capacity.
system testing and interpretation of result
Optical-fiber type Acousto-Optic Modulator Driver according to the present invention selects the stricter high-frequency circuit manufacture craft such as power filter network, shielding in manufacturing process.MOPA structured optical fiber laser acoustooptic modulation driving power according to the present invention is tested.Testing time is 2h, and the direct voltage recording additional power source supply driver is 24V, and direct current is 0.154A, and output power of circuit is 2.10W, then can obtain driving power efficiency.For the power output of circuit and the ratio of power supply input power, its value:
It is contradiction that driving power is linearly spent with high efficiency, considers parameter request and the actual demand of acousto-optic modulator, takes driving power linearly to spend the method design driving power with high efficiency compromise.The requirement of different acousto-optic modulators to the linearity is different, and its efficiency is also different.By integral united test, and test the electrical property of Acousto-Optic Modulator Driver 1# and 2# sample, result is as follows:
The technical parameter contrast table of table 2 optical-fiber type Acousto-Optic Modulator Driver 1# and 2# sample
Found through experiments, driving power power is higher, and the diffraction efficiency of acousto-optic modulator is higher, and when power output rises to 1.8W, diffraction efficiency is the highest; Along with the increase of driving power power, diffraction efficiency can slowly decline; When driving power power is too high, acousto-optic modulator development likely can be burnt.Experimental result shows, acousto-optic Q modulation drive circuit possesses the ability driving acousto-optic modulator, and property indices all reaches the set goal, and structure is simple, stable performance.Not only reduce the switching response time of driving power, also substantially increase the efficiency of power output stage, the MOPA structured optical fiber laser dominated at present for laser marking industry provides the optical-fiber type Acousto-Optic Modulator Driver of a stable performance.
The above; be only the embodiment in the present invention; but protection scope of the present invention is not limited thereto; any people being familiar with this technology is in the technical scope disclosed by the present invention; the conversion or replacement expected can be understood; all should be encompassed in and of the present inventionly comprise within scope, therefore, protection scope of the present invention should be as the criterion with the protection range of claims.In conjunction with the explanation of the present invention disclosed here and practice, other embodiments of the present invention are all apparent for those skilled in the art.Illustrate and embodiment be only considered to exemplary, true scope of the present invention and purport limited by claim.
Claims (10)
1. a pulse optical fiber Acousto-Optic Modulator Driver, it is characterized in that described driving power comprises high-frequency generator, 2ASK keying modulation circuit, preamplifier, power amplification circuit, controller circuitry, pulse steeping circuit and output matching network
Described high-frequency generator, for generation of high-frequency carrier signal, is made up of sine wave oscillation circuit and series connection frequency-selective network;
The modulating pulse input signal that described pulse steeping circuit receives from outside carries out steepness process to it, and for steepness modulated pulse signal and filtered signal spike, the signal after steepness process is input to described controller circuitry and regulates;
Described controller circuitry is used for the signal after the process of described pulse steeping circuit steepness to carry out voltage amplitude adjustment;
Described 2ASK keying modulation circuit carries out amplitude modulation(PAM) by the pulse signal regulated through described controller circuitry of input to the high-frequency carrier signal that described high-frequency generator produces;
Described preamplifier is used for the modulation signal after described 2ASK keying modulation circuit modulation to carry out amplitude amplification;
Described power amplification circuit is used for the signal after described preamplifier amplitude amplification to carry out power amplification;
Described output matching network exports after being used for that the modulation signal after described power amplification circuit amplification is carried out filtering and impedance matching, thus drives the work of described acousto-optic modulator.
2. driving power as claimed in claim 1, wherein said high-frequency generator produces by active integrated crystal oscillator the standard frequency carrier signal that centre frequency is 100MHz.
3. driving power as claimed in claim 1, the supply power voltage of wherein said driving power is direct current+24V, and operating frequency is 100MHz, and modulating frequency is 20kHz ~ 200kHz, and power output is 2W.
4. driving power as claimed in claim 1, the modulating frequency that wherein said 2ASK keying modulation circuit carries out amplitude modulation(PAM) to carrier signal is 20kHz ~ 200kHz.
5. driving power as claimed in claim 1, wherein said power amplification circuit comprises category-A and the hybrid two-stage amplifying circuit of C class.
6. the driving power as described in claim 1 or 6, wherein said power amplification circuit comprises the radio frequency power tube that model is MRF158.
7. driving power as claimed in claim 1, wherein said power stage matching network is L-type matching network.
8. driving power as claimed in claim 7, wherein said L-type matching network is by first filter capacitor of connecting successively configured at input and output respectively, the first inductance and the second filter capacitor, and one end is connected between the first filter capacitor and the first inductance, the first electric capacity composition of other end ground connection.
9. driving power as claimed in claim 1, wherein said power stage matching network is π type matching network.
10. driving power as claimed in claim 9, wherein said π type matching network is by the 3rd filter capacitor of connecting successively configured at input and output respectively, the second inductance and the 4th filter capacitor, one end is connected between the 3rd filter capacitor and the second inductance, second electric capacity of other end ground connection, and one end is connected between the second inductance and the 4th filter capacitor, the 3rd electric capacity composition of other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310231352.3A CN103296568B (en) | 2013-06-09 | 2013-06-09 | Pulse fiber laser acoustic optical modulator driving power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310231352.3A CN103296568B (en) | 2013-06-09 | 2013-06-09 | Pulse fiber laser acoustic optical modulator driving power source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103296568A CN103296568A (en) | 2013-09-11 |
| CN103296568B true CN103296568B (en) | 2015-06-17 |
Family
ID=49097069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310231352.3A Active CN103296568B (en) | 2013-06-09 | 2013-06-09 | Pulse fiber laser acoustic optical modulator driving power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103296568B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560392B (en) * | 2013-09-17 | 2016-04-06 | 中北大学 | One has 256 grades of linear Acousto-Optic Modulator Drivers of gray scale |
| CN103633541B (en) * | 2013-12-09 | 2016-03-09 | 北京信息科技大学 | Control the method for the pulse optical fiber power control system based on FPGA being used for laser marking |
| CN104660257A (en) * | 2015-03-25 | 2015-05-27 | 天津七六四通信导航技术有限公司 | L-band frequency synthesizer circuit |
| CN106773151B (en) * | 2016-12-05 | 2020-01-31 | 中国科学院上海高等研究院 | Acousto-optic modulator driving system |
| CN106444100A (en) * | 2016-12-16 | 2017-02-22 | 中国电子科技集团公司第二十六研究所 | Integration optical fiber acousto-optic device |
| CN107275918A (en) * | 2017-06-27 | 2017-10-20 | 武汉锐科光纤激光技术股份有限公司 | Optical fiber laser RF driving source |
| CN109755856A (en) * | 2017-11-07 | 2019-05-14 | 核工业理化工程研究院 | The driving power and laser of acousto-optic Q modulation crystal |
| CN109755848B (en) * | 2017-11-07 | 2024-04-19 | 核工业理化工程研究院 | High-efficiency heat-dissipation type acousto-optic Q-switched crystal driving power supply and laser |
| CN111277333B (en) * | 2020-01-20 | 2023-01-20 | 青岛海信宽带多媒体技术有限公司 | Optical module |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2347289Y (en) * | 1998-11-11 | 1999-11-03 | 中国科学院长春光学精密机械研究所 | System to stablize and modulate laser by means of one modulator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3650818B2 (en) * | 2001-10-02 | 2005-05-25 | 独立行政法人情報通信研究機構 | Optical pulse laser device |
| DE102006053187A1 (en) * | 2006-11-09 | 2008-05-15 | Leica Microsystems Cms Gmbh | Acousto-optic component |
| US7538929B2 (en) * | 2007-04-06 | 2009-05-26 | Harris Corporation | RF phase modulation technique for performing acousto-optic intensity modulation of an optical wavefront |
-
2013
- 2013-06-09 CN CN201310231352.3A patent/CN103296568B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2347289Y (en) * | 1998-11-11 | 1999-11-03 | 中国科学院长春光学精密机械研究所 | System to stablize and modulate laser by means of one modulator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103296568A (en) | 2013-09-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103296568B (en) | Pulse fiber laser acoustic optical modulator driving power source | |
| CN103227413B (en) | Semiconductor laser device driving circuit | |
| CN108963736A (en) | A kind of high-peak power picosecond and nanosecond short-wavelength light fibre laser | |
| CN206041199U (en) | High peak power semiconductor laser drive circuit of small -size narrow pulse width | |
| CN111509536A (en) | Narrow linewidth optical fiber laser spectrum broadening device based on periodic noise phase modulation | |
| CN212485794U (en) | Seed source driving circuit of gain switch semiconductor laser | |
| Darling et al. | High-power pulsed RF extraction from nonlinear lumped element transmission lines | |
| CN110265855A (en) | High-energy pulse cluster laser as microwave system light guide device signal source | |
| CN103281130B (en) | Based on single multiple frequence millimeter wave generating device that drives Mach zehnder modulators | |
| CN102545850A (en) | PWM (pulse-width modulation) comparator and class-D amplifier | |
| CN103346742B (en) | acousto-optic Q switch driver | |
| CN202458667U (en) | Driving power amplifier circuit for high-frequency electrotome | |
| CN110867719B (en) | Method for controlling Q-switching circuit, circuit board, Q-switching system and eliminating parasitic oscillation | |
| CN214625718U (en) | Laser driving power supply | |
| CN113991410A (en) | Spectrum control-based spectrum broadening and stimulated Brillouin scattering effect suppression method and system | |
| CN113346720B (en) | High-frequency driving amplifier, high-frequency power conversion circuit and radio frequency beauty instrument | |
| CN104320105A (en) | A mixed model capacitance multiplier circuit | |
| CN1426164A (en) | Ultra wide band narrow pulse generator of subnanosecond duration | |
| CN110518454A (en) | A kind of seed source device being able to achieve super continuous spectrums spectral laser | |
| Darling et al. | High power RF generation from non-linear delay lines | |
| CN1588814A (en) | Super broad band signal generating method and circuit based on chaotic signal broad band characteristic | |
| CN218335984U (en) | Ultra-low additional phase noise high-power flatness comb spectrum signal generator | |
| CN108092634A (en) | A kind of broadband, high-power underwater sound D-type power amplifier | |
| CN204119168U (en) | A kind of simple and easy waveform generator | |
| CN2922217Y (en) | Tunable all optical fiber structure narrow-band and anrrow-pluse laser device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |