CN117650427B - Pulse group modulation circuit, laser driving device and laser - Google Patents
Pulse group modulation circuit, laser driving device and laser Download PDFInfo
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- CN117650427B CN117650427B CN202410124519.4A CN202410124519A CN117650427B CN 117650427 B CN117650427 B CN 117650427B CN 202410124519 A CN202410124519 A CN 202410124519A CN 117650427 B CN117650427 B CN 117650427B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0427—Electrical excitation ; Circuits therefor for applying modulation to the laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
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Abstract
The invention provides a pulse group modulation circuit, a laser driving device and a laser; by the pulse group modulation circuit, the input waveform can be improved from the existing 1MHz to the maximum 30MHz, and meanwhile, the analog continuous waveform can be compatible, so that the limitation of the application scene of pulse groups caused by waveform control level is avoided; the pulse group number can be adjusted according to the generated pulse group modulation signal, so that the pulse group number and/or the pulse number in the pulse group can be flexibly set according to the actual application scene, and the application scene of the pulse group is widened; in addition, the width of the pulse group can be reduced from the existing nanosecond level to the picosecond level, so that the application scene of the pulse group is further widened, the practical value is good, and the method is convenient to popularize and implement in practical application.
Description
Technical Field
The present invention relates to the field of laser technology, and in particular, to a pulse group modulation circuit, a laser driving device, and a laser.
Background
Currently, for existing pulse burst generators, such as lasers, in their driving circuits, the modulation frequency of the pulse burst in the analog given waveform is at most 1MHz, and furthermore, the number of pulse bursts in the waveform control is 3, and the width of the narrowest pulse burst is in nanosecond order, such as 20ns; such a driving circuit, although driving a laser to generate pulse bursts, has the following disadvantages: ① The quantization and waveform control corresponding to 1MHz can only achieve microsecond level, and the waveform control level is limited; ② The number of pulse groups is fixed, and the flexibility of practical application is lacking; ③ The width of the narrowest pulse group is limited to nanosecond level, and the pulse group selection with picosecond level width can not be realized, so that the application scene of the pulse group is limited, and the actual application requirement can not be met.
Disclosure of Invention
Therefore, the invention aims to provide a pulse group modulation circuit, a laser driving device and a laser, so as to at least alleviate the problems of the above parts, widen the application scene of pulse groups, have better practical value and facilitate popularization and implementation in practical application.
In a first aspect, an embodiment of the present invention provides a pulse group modulation circuit, including: the device comprises a pulse setting interface, a synchronous output interface, a waveform input interface, a high-frequency pulse width modulation unit, a radio frequency shaping unit, a radio frequency clock unit, a pulse selection unit, a pulse group modulation unit and a modulation output interface; the pulse setting interface is connected with the pulse selecting unit, the radio frequency shaping unit is respectively connected with the radio frequency clock unit, the synchronous output interface, the high-frequency pulse width modulation unit and the pulse selecting unit, the high-frequency pulse width modulation unit is also respectively connected with the waveform input interface and the pulse group modulation unit, and the pulse group modulation unit is also respectively connected with the pulse selecting unit and the modulation output interface;
The radio frequency shaping unit is used for acquiring the clock signal sent by the radio frequency clock unit and shaping the clock signal to obtain rectangular pulses; dividing the rectangular pulse into three paths, wherein one path is transmitted to a synchronous output interface to be output as a synchronous signal, the other path is transmitted to a high-frequency pulse width modulation unit, and the last path is transmitted to a pulse selection unit;
the high-frequency pulse width modulation unit is used for acquiring an input waveform and a rectangular pulse sent by the waveform input interface, modulating the input waveform and the rectangular pulse, generating a pulse group signal and sending the pulse group signal to the pulse group modulation unit;
The pulse selecting unit is used for acquiring the pulse number setting signal and the rectangular pulse of the pulse group sent by the pulse setting interface, generating a pulse width modulation signal according to the pulse number setting signal and the rectangular pulse, and sending the pulse width modulation signal to the pulse group modulation unit;
the pulse group modulation unit is used for acquiring a pulse group signal and a pulse width modulation signal and generating the pulse group modulation signal according to the pulse group signal and the pulse width modulation signal; and transmitting the pulse group modulation signal to the laser through the modulation output interface so that the laser generates a modulatable pulse group according to the pulse group modulation signal.
Preferably, the radio frequency shaping unit comprises: the first operational amplifier, the first resistor, the second resistor and the first capacitor; one end of the first resistor and one end of the second resistor are connected with the radio frequency clock unit, the other end of the first resistor is connected with the positive electrode of the first operational amplifier, the other end of the second resistor is connected with the negative electrode of the first operational amplifier, one end of the first capacitor is connected between the second resistor and the negative electrode of the first operational amplifier, the other end of the first capacitor is grounded, and the output end of the first operational amplifier is connected with the synchronous output interface, the high-frequency pulse width modulation unit and the pulse selection unit respectively.
Preferably, the high frequency pulse width modulation unit includes: a second operational amplifier, a third operational amplifier, and a second capacitor; the positive electrode of the second operational amplifier is grounded, the negative electrode of the second operational amplifier is connected with the output end of the first operational amplifier, the output end of the second operational amplifier is connected with the negative electrode of the third operational amplifier, one end of the second capacitor is connected with the negative electrode of the second operational amplifier, the other end of the second capacitor is connected with the output end of the second operational amplifier, the positive electrode of the third operational amplifier is connected with the waveform input interface, and the output end of the third operational amplifier is connected with the pulse group modulation unit.
Preferably, the pulse group modulation unit includes: a switching element, a fourth operational amplifier, a third resistor, and a fourth resistor; one end of the third resistor is connected with the output end of the third operational amplifier, the other end of the third resistor is connected with the base electrode of the switching element, the emitter electrode of the switching element is grounded, the collector electrode of the switching element is connected to the power supply voltage, the negative electrode of the fourth operational amplifier is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the collector electrode of the switching element, the positive electrode of the fourth operational amplifier is connected with the pulse selection unit, and the output end of the fourth operational amplifier is connected with the modulation output interface.
Preferably, the pulse picking unit includes: the digital potentiometer, the first NOR gate element, the second NOR gate element, the zener diode and the third capacitor; the third end of the digital potentiometer is connected with the pulse setting interface, the second end of the digital potentiometer is grounded, the first end of the digital potentiometer is connected with the power supply voltage, the first end of the first nor gate element is connected with the output end of the first operational amplifier, the second end of the first nor gate element is connected with the positive electrode of the voltage stabilizing diode, the third end of the first nor gate element is grounded, the fourth end of the first nor gate element is connected with one end of the third capacitor, the fifth end of the first nor gate element is connected with the power supply voltage, the other end of the third capacitor is connected with the first end and the second end of the second nor gate element respectively, the third end of the second nor gate element is grounded, the fourth end of the second nor gate element is connected with the positive electrode of the voltage stabilizing diode, the fifth end of the second nor gate element is connected with the power supply voltage, the negative electrode of the voltage stabilizing diode is connected with the positive electrode of the fourth operational amplifier, and the fifth end of the digital potentiometer is connected between the third capacitor and the first end of the second nor gate element.
Preferably, the pulse group modulation unit is further configured to generate a pulse group modulation signal according to a preset processing manner according to the pulse group signal and the pulse width modulation signal; the preset processing mode comprises one of the following steps: and processing, or not processing, nand processing, exclusive or processing, and or processing.
Preferably, the input waveform is a 30MHz radio frequency waveform or a continuous waveform.
In a second aspect, an embodiment of the present invention further provides a laser driving device, where the laser driving device includes the pulse group modulation circuit of the first aspect.
In a third aspect, an embodiment of the present invention further provides a laser, which includes the laser driving device of the second aspect.
Preferably, the laser is a butterfly semiconductor laser or a coaxial semiconductor laser.
The embodiment of the invention has the following beneficial effects:
The embodiment of the invention provides a pulse group modulation circuit, a laser driving device and a laser, through the pulse group modulation circuit, the input waveform can be improved from the existing 1MHz to the maximum 30MHz, and meanwhile, the pulse group modulation circuit can be compatible with the simulated continuous waveform, so that the limitation of the application scene of the pulse group caused by the waveform control level is avoided; the pulse group number can be adjusted according to the generated pulse group modulation signal, so that the pulse group number and/or the pulse number in the pulse group can be flexibly set according to the actual application scene, and the application scene of the pulse group is widened; in addition, the width of the pulse group can be reduced from the existing nanosecond level to the picosecond level, so that the application scene of the pulse group is further widened, the practical value is good, and the method is convenient to popularize and implement in practical application.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a pulse group modulation circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a pulse group modulation circuit according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to facilitate understanding of the present embodiment, the following describes embodiments of the present invention in detail.
An embodiment of the present invention provides a pulse group modulation circuit, as shown in fig. 1, including: a pulse setting interface 01, a synchronous output interface 02, a waveform input interface 03, a high-frequency pulse width modulation unit 04, a radio frequency shaping unit 05, a radio frequency clock unit 06, a pulse selecting unit 07, a pulse group modulation unit 09 and a modulation output interface 08. Note that, the high-Frequency PWM (pulse width modulation) unit 04 may also be referred to as a high-Frequency PWM (Pulse Width Modulation) unit, the Radio Frequency shaping unit 05 may also be referred to as an RF (Radio Frequency) shaping unit, and the Radio Frequency clock unit 06 may also be referred to as an RF clock unit.
The pulse setting interface 01 is connected with the pulse selecting unit 07, the radio frequency shaping unit 05 is respectively connected with the radio frequency clock unit 06, the synchronous output interface 02, the high-frequency pulse width modulation unit 04 and the pulse selecting unit 07, the high-frequency pulse width modulation unit 04 is respectively connected with the waveform input interface 03 and the pulse group modulation unit 09, and the pulse group modulation unit 09 is respectively connected with the pulse selecting unit 07 and the modulation output interface 08.
In order to facilitate explanation of the operation principle of the pulse-group modulation circuit, the functions of the respective parts of the pulse-group modulation circuit are described in detail as follows.
The pulse setting interface 01 is used for setting the number of pulses in the pulse group, and since the pulse group consists of a series of pulses with limited number, the pulse number of the pulse group can be set.
A synchronous output interface 02, configured to output the rectangular pulse sent by the radio frequency shaping unit 05 as a synchronous signal; of these, the rectangular pulse is preferably an RF rectangular pulse having a frequency of 600MHz and TR/TF (rise time/fall time) of less than 200PS for achieving waveform synchronization.
A waveform input interface 03 for acquiring an input waveform and transmitting the input waveform to the high-frequency pulse width modulation unit 04; the input waveform is a 30MHz radio frequency waveform or a continuous waveform, namely, two types of signals of a programmable RF pulse and an analog continuous waveform are input, so that the input waveform can be improved from the existing 1MHz to the maximum 30MHz, and meanwhile, the analog continuous waveform can be compatible, the waveform is controlled to nanosecond level, and the limitation of the application scene of pulse groups caused by the waveform control level is avoided.
The radio frequency clock unit 06 is configured to generate a clock signal, such as a 600MHz clock signal or a fundamental trigger pulse, and send the clock signal to the radio frequency shaping unit 05.
The radio frequency shaping unit 05 is used for acquiring the clock signal sent by the radio frequency clock unit 06 and shaping the clock signal to obtain rectangular pulses; and dividing the rectangular pulse into three paths, wherein one path is sent to the synchronous output interface 02 to be output as a synchronous signal, the other path is sent to the high-frequency pulse width modulation unit 04, and the last path is sent to the pulse selection unit 07.
The high-frequency pulse width modulation unit 04 is configured to acquire an input waveform sent by the waveform input interface 03 and a rectangular pulse sent by the radio frequency shaping unit 05, modulate the input waveform and the rectangular pulse, generate a pulse group signal, and send the pulse group signal to the pulse group modulation unit 09. For example, a 30MHz radio frequency waveform and a 600MHz rectangular pulse are modulated, and the generated 30MHz pulse group signal is sent to the pulse group modulation unit 09.
The pulse selecting unit 07 is configured to obtain a pulse number setting signal of the pulse group sent by the pulse setting interface 01 and a rectangular pulse sent by the radio frequency shaping unit 05, generate a pulse width modulation signal according to the pulse number setting signal and the rectangular pulse, and send the pulse width modulation signal to the pulse group modulation unit 09, thereby setting and selecting the picosecond pulse number through the pulse width modulation signal, not only realizing the modulation of the pulse number in the pulse group, but also reducing the width of the pulse group from nanosecond level to picosecond level, for example, reducing 900ps from original 20ns, and being applicable to editing control of the picosecond level pulse, thereby further widening the application scenario of the pulse group.
A pulse group modulation unit 09 for acquiring the pulse group signal sent by the high-frequency pulse width modulation unit 04 and the pulse width modulation signal sent by the pulse selection unit 07, and generating a pulse group modulation signal according to the pulse group signal and the pulse width modulation signal; and transmitting the pulse group modulation signal to the laser through the modulation output interface 08 so that the laser generates a modulatable pulse group according to the pulse group modulation signal; therefore, the pulse group number and the pulse number in the pulse group can be modulated, and the application scene of the pulse group is widened.
Therefore, the pulse group modulation circuit can not only improve the input waveform from the existing 1MHz to the maximum 30MHz, but also be compatible with the simulated continuous waveform, thereby avoiding the limitation of the application scene of the pulse group caused by the waveform control level; the number of pulse groups can be adjusted according to the generated pulse group modulation signals, so that the number of pulse groups and/or the number of pulses in the pulse groups can be flexibly set according to actual application scenes, and the application scenes of the pulse groups are widened; in addition, the width of the pulse group can be reduced from the existing nanosecond level to the picosecond level, so that the application scene of the pulse group is further widened, the practical value is good, and the method is convenient to popularize and implement in practical application.
Illustratively, the radio frequency shaping unit 05 includes: the first operational amplifier, the first resistor, the second resistor and the first capacitor; one end of the first resistor and one end of the second resistor are connected with the radio frequency clock unit, the other end of the first resistor is connected with the positive electrode of the first operational amplifier, the other end of the second resistor is connected with the negative electrode of the first operational amplifier, one end of the first capacitor is connected between the second resistor and the negative electrode of the first operational amplifier, the other end of the first capacitor is grounded, and the output end of the first operational amplifier is connected with the synchronous output interface, the high-frequency pulse width modulation unit and the pulse selection unit respectively.
Therefore, for the radio frequency shaping unit 05, the clock signal sent by the radio frequency clock unit 06 reaches the first operational amplifier through the first resistor and the second resistor, so that the first operational amplifier performs shaping processing on the clock signal, outputs an RF rectangular pulse with TR/TF (rise time/fall time) smaller than 200PS, divides the RF rectangular pulse into three paths, outputs one path through the synchronous output interface 02, and sends the other two paths to the high frequency pulse width modulation unit 04 and the pulse selection unit 07, so that shaping processing and isolation output of the clock signal are realized through the radio frequency shaping unit 05.
Illustratively, the high frequency pulse width modulation unit 04 includes: a second operational amplifier, a third operational amplifier, and a second capacitor; the positive pole of the second operational amplifier is grounded, the negative pole of the second operational amplifier is connected with the output end of the first operational amplifier, the output end of the second operational amplifier is connected with the negative pole of the third operational amplifier, one end of the second capacitor is connected with the negative pole of the second operational amplifier, the other end of the second capacitor is connected with the output end of the second operational amplifier, the positive pole of the third operational amplifier is connected with the waveform input interface, and the output end of the third operational amplifier is connected with the pulse group modulation unit 09.
Therefore, for the high-frequency pulse width modulation unit 04, the rectangular pulse sent by the radio frequency shaping unit 05 is input to the second operational amplifier, and then processed by the second operational amplifier to obtain a triangular wave, and the triangular wave is input to the third operational amplifier; at this time, the third operational amplifier modulates the input waveform transmitted from the triangular wave and waveform input interface 03 to generate a pulse group signal such as a high-frequency PWM signal, thereby realizing modulation of the pulse group signal.
Illustratively, the pulse group modulation unit 09 includes: a switching element, a fourth operational amplifier, a third resistor, and a fourth resistor; one end of the third resistor is connected with the output end of the third operational amplifier, the other end of the third resistor is connected with the base electrode of the switching element, the emitter electrode of the switching element is grounded, the collector electrode of the switching element is connected to the power supply voltage, the negative electrode of the fourth operational amplifier is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the collector electrode of the switching element, the positive electrode of the fourth operational amplifier is connected with the pulse selection unit 07, and the output end of the fourth operational amplifier is connected with the modulation output interface 08.
Further, the pulse selecting unit 07 includes: the digital potentiometer, the first NOR gate element, the second NOR gate element, the zener diode and the third capacitor; the third end of the digital potentiometer is connected with the pulse setting interface, the second end of the digital potentiometer is grounded, the first end of the digital potentiometer is connected with the power supply voltage, the first end of the first nor gate element is connected with the output end of the first operational amplifier, the second end of the first nor gate element is connected with the positive electrode of the voltage stabilizing diode, the third end of the first nor gate element is grounded, the fourth end of the first nor gate element is connected with one end of the third capacitor, the fifth end of the first nor gate element is connected with the power supply voltage, the other end of the third capacitor is connected with the first end and the second end of the second nor gate element respectively, the third end of the second nor gate element is grounded, the fourth end of the second nor gate element is connected with the positive electrode of the voltage stabilizing diode, the fifth end of the second nor gate element is connected with the power supply voltage, the negative electrode of the voltage stabilizing diode is connected with the positive electrode of the fourth operational amplifier, and the fifth end of the digital potentiometer is connected between the third capacitor and the first end of the second nor gate element.
Specifically, the pulse setting interface 01 may send a communication signal to the digital potentiometer in addition to the pulse number setting signal, so that the digital potentiometer adjusts according to the communication signal, thereby changing the charging constant of the third capacitor, so that the first nor gate element, the digital potentiometer and the second nor gate element form a programmable pulse width selector, and further output a pulse width modulation signal, that is, an RF signal with an adjustable pulse width, and send the pulse width modulation signal to the fourth operational amplifier through the zener diode. At this time, the fourth operational amplifier generates a pulse group modulation signal according to the pulse width modulation signal and the pulse group signal, and realizes the adjustment of the number of pulse groups and the number of pulses in the pulse group.
In addition, the pulse group modulation unit 09 is further configured to generate a pulse group modulation signal according to a preset processing manner according to the pulse group signal and the pulse width modulation signal; the preset processing mode comprises one of the following steps: and processing, or not processing, nand processing, exclusive or processing, and or processing. For example, in practical applications, the pulse-burst modulation unit 09 performs and processing on the high-frequency PWM pulse-burst signal and the RF programming pulse (i.e. pulse width modulation signal), so as to generate a pulse-burst modulated signal with a modulated pulse burst, so that the subsequent laser or the laser device generates a corresponding pulse burst according to the pulse-burst modulated signal.
In summary, the pulse group modulation circuit can be used as a pre-stage circuit of a driving circuit of a semiconductor laser device, and the pulse group modulation signal is generated to modulate the number of pulse groups output by the semiconductor laser device and the number of pulses in the pulse groups, so that the application scene of the pulse groups is widened, and the pulse group modulation circuit has good practical value.
Referring to a circuit diagram of a pulse-burst modulation circuit as shown in fig. 2, there is shown: a pulse setting interface 01, a synchronous output interface 02, a waveform input interface 03, a high-frequency pulse width modulation unit 04, a radio frequency shaping unit 05, a radio frequency clock unit 06, a pulse selecting unit 07, a pulse group modulation unit 09 and a modulation output interface 08.
The pulse setting interface 01 comprises a pulse number setting interface CH_IN, wherein the CH_IN is connected to a third end of the digital potentiometer U5; the radio frequency clock unit 06 includes a clock chip Y1 and a capacitor C6, where a second end of the clock chip Y1 is grounded, a third end of the clock chip Y1 is connected to one end of the capacitor C6, another end of the capacitor C6 is grounded, a first end and a fourth end of the clock chip Y1 are connected to a power supply voltage 5V, and in addition, the third end of the clock chip Y1 is further connected to the radio frequency shaping unit 05.
For the radio frequency shaping unit 05, it comprises: a first operational amplifier U1-A, a resistor R6, a resistor R4 and a capacitor C8; one end of a resistor R6 and one end of a resistor R4 are connected with a third end of a clock chip Y1, the other end of the resistor R6 is connected with an anode of a U1-A, the other end of the resistor R4 is connected with a cathode of the U1-A, one end of a capacitor C8 is connected between the resistor R4 and the cathode of the U1-A, the other end of the capacitor C8 is grounded, and an output end of the U1-A is connected with a synchronous output interface 02, in particular to a synchronous output RF-OUT interface in the synchronous output interface 02; and the output end of the U1-A is also grounded through a resistor R5, connected with the high-frequency pulse width modulation unit 04 through a resistor R15 and connected with the pulse selection unit 07 through a capacitor C9.
Further, the high-frequency pulse width modulation unit 04 includes: a second operational amplifier U2-B, a third operational amplifier U2-A and a capacitor C10; the positive electrode of the U2-B is grounded, the negative electrode of the U2-B is connected with the resistor R15, one end of the capacitor C10 is connected with the negative electrode of the U2-B, the other end of the capacitor C10 is connected with the output end of the U2-B, the output end of the U2-B is connected with the negative electrode of the U2-A, the negative electrode of the U2-A is grounded through the resistor R17, the positive electrode of the U2-A is connected with the waveform input interface 03, IN particular to the waveform input interface DA-IN of the waveform input interface 03, one end of the resistor R18 is connected between the positive electrode of the U2-A and the waveform input interface 03, and the other end of the resistor R18 is grounded; the output of U2-A is connected to the pulse-burst modulation unit 09, and the output of U2-A is connected to ground via resistor R16.
The pulse group modulation section 09 includes: a switching element Q1, a fourth operational amplifier U1-B, a resistor R13, a resistor R14, a resistor R3, and a resistor R12; one end of a resistor R13 is connected with the output end of the U2-A, the other end of the resistor R13 is connected with the base electrode of the Q1, one end of a resistor R14 is connected between the base electrodes of the resistor R13 and the Q1, the other end of the resistor R14 is grounded, the emitter electrode of the Q1 is grounded, and the collector electrode of the Q1 is connected to the power supply voltage of 5V through a resistor R12; the negative electrode of the U1-B is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the collector electrode of the Q1, and the positive electrode of the U1-B is connected with the pulse selecting unit 07 through a resistor R7; in addition, the positive electrode of the U1-B is grounded through a resistor R9, and the output end of the U1-B is connected with the modulation output interface 08, in particular to the PWM pulse group output interface CH-OUT of the modulation output interface 08. And one end of the resistor R11 is connected between the output end of the U1-B and the modulation output interface 08, and the other end of the resistor R11 is grounded.
And, the pulse selecting unit 07 includes: a digital potentiometer U5, a first NOR gate element U3, a second NOR gate element U4, a zener diode D8, a capacitor C7 and a resistor R10; the third end of the U5 is connected with the pulse number setting interface CH_IN, the second end of the U5 is grounded, the first end and the fifth end of the U5 are both connected with the power supply voltage 5V, the first end of the U3 is connected with the output end of the U1-A through a capacitor C9, the C9 is grounded through a resistor R8, the second end of the U3 is connected with the positive electrode of the D8, the third end of the U3 is grounded, the fourth end of the U3 is connected with one end of a capacitor C7, the fifth end of the U3 is connected with the power supply voltage 5V, the other end of the capacitor C7 is connected with the first end and the second end of the U4 respectively, the third end of the U4 is grounded, the fourth end of the U4 is connected with the positive electrode of the D8, the fifth end of the U4 is connected with the power supply voltage 5V, the negative electrode of the D8 is connected with the resistor R7, and the sixth end of the U5 is connected between the capacitor C7 and the first end of the U4. In addition, one end of the resistor R10 is connected between the fourth end of U4 and the positive electrode of D8, and the other end of the resistor R10 is grounded.
For the pulse group modulation circuit, IN practical application, the power supply voltage is set to be 5V, a 30MHz pulse signal with adjustable amplitude is input to a waveform input DA-IN interface, the power-on is started, the Y1 work generates a 600MHz clock signal, the 600MHz clock signal is transmitted to the U1-A through a resistor R6/a resistor R4 for shaping treatment, and RF rectangular pulses with TR/TF (rise time/fall time) smaller than 200PS are output. At this time, the RF rectangular pulse is divided into three paths, one path is output as a synchronous signal through an RF-OUT interface, the other path is transmitted to the cathode of U2-B through a resistor R15, triangular waves are generated after the processing of U2-B, the triangular waves are transmitted to U2-A through the output end of U2-B, the U2-A also receives an analog continuous waveform or a 30MHz pulse signal input by a waveform input DA-IN interface, the analog continuous waveform or the 30MHz pulse signal is modulated with the triangular waves, a high-frequency PWM pulse group signal is output by the output end of U2-A, and the high-frequency PWM pulse group signal is transmitted to the cathode of U1-B through Q1.
IN addition, the third path of RF rectangular pulse is further transmitted to the pulse selecting unit 07 through the capacitor C9, the U5 IN the pulse selecting unit 07 further obtains a pulse number setting signal sent by the pulse number setting interface ch_in, and adjusts according to the pulse number setting signal, so as to change the charging constant of the capacitor C7, finally, U3, U4 and U5 form a programmable pulse width selector, output an RF signal with adjustable pulse width, couple to the positive electrode of U1-B through the resistor R7, perform and process with the high frequency PWM pulse group signal of the negative electrode of U1-B, finally generate a pulse group modulation signal with controllable pulse number and pulse number IN the pulse group, and output the pulse group modulation signal to the PWM pulse group output interface ch_out through the output end of U1-B. And the PWM pulse group output interface CH-OUT transmits the pulse group modulation signal to the laser so that the laser outputs a corresponding pulse group according to the pulse group modulation signal.
It should be noted that, in the above pulse group modulation circuit, the bi-phase shift clock signal may be further used to synchronize to the high-frequency modulator and the pulse width selector, and specifically, the adaptive adjustment may be performed according to the actual situation, which is not described in detail herein.
Therefore, for the pulse group modulation circuit, the input waveform can be increased from the existing 1MHz to the maximum 30MHz, and meanwhile, the analog continuous waveform can be compatible, so that the limitation of the application scene of the pulse group caused by the waveform control level is avoided; the pulse group number can be adjusted according to the generated pulse group modulation signal, so that the pulse group number and/or the pulse number in the pulse group can be flexibly set according to the actual application scene, and the application scene of the pulse group is widened; in addition, the width of the pulse group can be reduced from the existing nanosecond level to the picosecond level, for example, the width is reduced from the existing 20ns to 900ps, so that the pulse group is used for editing control of picosecond-level pulses, the application scene of the pulse group is further widened, the practical value is good, and the pulse group is convenient to popularize and implement in practical application.
Further, the embodiment of the invention also provides a laser driving device, which comprises the pulse group modulation circuit.
Further, the embodiment of the invention also provides a laser which comprises the laser driving device. The laser is preferably a butterfly semiconductor laser or a coaxial semiconductor laser, and particularly can be adaptively adjusted according to practical situations.
The laser provided by the embodiment of the invention has the same technical characteristics as the laser driving device provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
It will be clear to those skilled in the art that, for convenience and brevity of description, the specific operation of the laser and the device described above may refer to the corresponding procedure of the pulse group modulation circuit in the foregoing embodiment, which is not described herein again.
In addition, in the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A pulse group modulation circuit, comprising: the device comprises a pulse setting interface, a synchronous output interface, a waveform input interface, a high-frequency pulse width modulation unit, a radio frequency shaping unit, a radio frequency clock unit, a pulse selection unit, a pulse group modulation unit and a modulation output interface;
The pulse setting interface is connected with the pulse selecting unit, the radio frequency shaping unit is respectively connected with the radio frequency clock unit, the synchronous output interface, the high-frequency pulse width modulation unit and the pulse selecting unit, the high-frequency pulse width modulation unit is also respectively connected with the waveform input interface and the pulse group modulation unit, and the pulse group modulation unit is also respectively connected with the pulse selecting unit and the modulation output interface;
the waveform input interface is used for acquiring an input waveform and sending the input waveform to the high-frequency pulse width modulation unit; wherein the input waveform is a 30MHz radio frequency waveform or a continuous waveform;
the radio frequency shaping unit is used for acquiring the clock signal sent by the radio frequency clock unit and shaping the clock signal to obtain rectangular pulses; dividing the rectangular pulse into three paths, wherein one path is transmitted to the synchronous output interface to be output as a synchronous signal, the other path is transmitted to the high-frequency pulse width modulation unit, and the last path is transmitted to the pulse selection unit;
The high-frequency pulse width modulation unit is used for acquiring an input waveform and the rectangular pulse sent by the waveform input interface, modulating the input waveform and the rectangular pulse, generating a pulse group signal, and sending the pulse group signal to the pulse group modulation unit;
The pulse selecting unit is used for acquiring the pulse number setting signal of the pulse group sent by the pulse setting interface and the rectangular pulse, generating a pulse width modulation signal according to the pulse number setting signal and the rectangular pulse, setting and selecting the number of picosecond pulses through the pulse width modulation signal, and sending the pulse width modulation signal to the pulse group modulation unit;
The pulse group modulation unit is used for acquiring the pulse group signal and the pulse width modulation signal and generating a pulse group modulation signal according to a preset processing mode according to the pulse group signal and the pulse width modulation signal; wherein, the preset processing mode comprises one of the following steps: and processing, or not processing, nand processing, exclusive or processing; and transmitting the pulse group modulation signal to a laser through the modulation output interface so that the laser generates a modulatable pulse group according to the pulse group modulation signal.
2. The pulse-burst modulation circuit of claim 1, wherein the radio frequency shaping unit comprises: the first operational amplifier, the first resistor, the second resistor and the first capacitor;
One end of the first resistor and one end of the second resistor are connected with the radio frequency clock unit, the other end of the first resistor is connected with the positive electrode of the first operational amplifier, the other end of the second resistor is connected with the negative electrode of the first operational amplifier, one end of the first capacitor is connected between the second resistor and the negative electrode of the first operational amplifier, the other end of the first capacitor is grounded, and the output end of the first operational amplifier is respectively connected with the synchronous output interface, the high-frequency pulse width modulation unit and the pulse selection unit.
3. The pulse group modulation circuit according to claim 2, wherein the high frequency pulse width modulation unit comprises: a second operational amplifier, a third operational amplifier, and a second capacitor;
The positive electrode of the second operational amplifier is grounded, the negative electrode of the second operational amplifier is connected with the output end of the first operational amplifier, the output end of the second operational amplifier is connected with the negative electrode of the third operational amplifier, one end of the second capacitor is connected with the negative electrode of the second operational amplifier, the other end of the second capacitor is connected with the output end of the second operational amplifier, the positive electrode of the third operational amplifier is connected with the waveform input interface, and the output end of the third operational amplifier is connected with the pulse group modulation unit.
4. The pulse-burst modulation circuit of claim 3, wherein the pulse-burst modulation unit comprises: a switching element, a fourth operational amplifier, a third resistor, and a fourth resistor;
One end of the third resistor is connected with the output end of the third operational amplifier, the other end of the third resistor is connected with the base electrode of the switching element, the emitter electrode of the switching element is grounded, the collector electrode of the switching element is connected to the power supply voltage, the negative electrode of the fourth operational amplifier is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the collector electrode of the switching element, the positive electrode of the fourth operational amplifier is connected with the pulse selection unit, and the output end of the fourth operational amplifier is connected with the modulation output interface.
5. The pulse group modulation circuit according to claim 4, wherein the pulse picking unit comprises: the digital potentiometer, the first NOR gate element, the second NOR gate element, the zener diode and the third capacitor;
The third end of the digital potentiometer is connected with the pulse setting interface, the second end of the digital potentiometer is grounded, the first end of the digital potentiometer is connected with a power supply voltage, the first end of the first nor gate element is connected with the output end of the first operational amplifier, the second end of the first nor gate element is connected with the positive electrode of the voltage stabilizing diode, the third end of the first nor gate element is grounded, the fourth end of the first nor gate element is connected with one end of the third capacitor, the fifth end of the first nor gate element is connected with the power supply voltage, the other end of the third capacitor is connected with the first end and the second end of the second nor gate element, the third end of the second nor gate element is grounded, the fourth end of the second nor gate element is connected with the positive electrode of the voltage stabilizing diode, the negative electrode of the second nor gate element is connected with the positive electrode of the fourth operational amplifier, and the fifth end of the second nor gate element is connected with the fourth capacitor.
6. A laser driving device comprising a pulse group modulation circuit as claimed in any one of the preceding claims 1-5.
7. A laser, characterized in that it comprises a laser driving device according to claim 6.
8. The laser of claim 7, wherein the laser is a butterfly semiconductor laser or a coaxial semiconductor laser.
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