CN113093211A

CN113093211A - Driving laser system

Info

Publication number: CN113093211A
Application number: CN202110338581.XA
Authority: CN
Inventors: 雷述宇
Original assignee: Ningbo Abax Sensing Electronic Technology Co Ltd
Current assignee: Ningbo Abax Sensing Electronic Technology Co Ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-07-09

Abstract

The present invention provides a drive laser system comprising: a power supply module, a laser emitter connected with the power supply module, a control unit including a control end, a first pole and a second pole, the first pole is connected with the laser emitter, the second pole is connected with the reference end, the control end is connected with the pulse generation module, the pulse generation module comprises an ITOF rectangular wave signal generation unit and a DTOF narrow pulse type pulse signal generation unit, the control end receives the control of the pulse signal of the pulse generation module, so that the laser transmitter outputs rectangular light detected by ITOF or narrow pulse light detected by DTOF, the invention outputs a driving voltage or current signal through the power supply module, the pulse signal generation module connected with the control end of the control unit can alternatively output the ITOF or DTOF driving signal, therefore, the universality of the system is improved, and the design of the system also has the composite performance of simplicity and convenience and multiple functions.

Description

Driving laser system

Technical Field

The invention relates to the field of driving circuits, in particular to a driving laser system.

Background

The principle of the active detection system, which is realized by using a laser source in particular, is that a light source actively emits a detected emission light, for example, a near-infrared type detection light, the wavelength of which may be selected within the range of 800-.

Time of flight ("TOF") light detection and ranging ("LIDAR") is a technique for remote distance measurement. TOF LIDAR sensors determine the distance between an instrument, including the sensor and an object, by measuring the time required for a laser pulse to travel between the instrument and the object.

The detection methods currently in wider application include an indirect time-of-flight (ITOF) measurement scheme and a direct time-of-flight (DTOF) measurement scheme. Most indirect flight time measurement schemes adopt a method for measuring phase offset, namely, the phase difference between transmitted waves and received waves, the abscissa of the transmitted waves and the abscissa of the received waves is time t, the ordinate is light intensity, the flight time t can be obtained according to the phase difference between the transmitted waves and the received waves, and therefore the distance of a detected object can be obtained through calculation according to D ═ c × t/2. The direct time-of-flight measurement scheme generally uses a picosecond resolution measurement system (mostly adopts SPAD + TDC), and directly obtains the time difference between the emission and the trigger of the corresponding receiving end, namely the time-of-flight t, so as to calculate the distance of the detected object. In the two detection modes most widely used, due to the difference of detection mechanisms, the requirements of the ITOF detection system and the DTOF detection system for emitted pulsed light are different, but in many scenarios, the DTOF detection system and the ITOF detection system have different advantages, and in a more optimal case, it is necessary to design a system capable of switching between the ITOF mode and the DTOF mode, for example, in the ITOF detection mechanism, the distance resolution is low, the influence of multipath interference exists in a complex situation of a field of view, a certain design optimization is required to remove the influence of multipath interference, the emitted signal is a continuous wave or a continuous pulse with a certain duty ratio, the DTOF detection mechanism has a high recognition degree for the multipath interference, no additional algorithm is basically required or the multipath interference is required to be removed, the emitted detection light waveform is a continuous type of narrow pulse, and the system has a high energy utilization rate for the detection light, so that a composite type detection system may become a requirement, although the detection mechanisms of different scenes or products are preset in another scene, the separately configured adaptive driving system has a large resource waste in production and also introduces a potential risk in the reliability aspect, so that it is an urgent problem to configure different detection systems by designing a detection light capable of driving a laser emission source to emit two different types of detection systems.

Disclosure of Invention

The present invention is directed to provide a driving laser system to solve the above-mentioned shortcomings in the prior art, so as to solve the problem of the related art that the accuracy and diversity of the driving and laser driving of two different types of detection systems, DTOF and ITOF, cannot be achieved by using a simple driving system.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:

the embodiment of the invention provides a laser driving system, which is characterized by comprising:

the power supply module is connected with the laser transmitter; the control unit comprises a control end, a first pole and a second pole, wherein the first pole is connected with the laser transmitter, the second pole is connected with a reference end, the control end is connected with a pulse generation module, the pulse generation module comprises an ITOF rectangular wave signal generation unit and a DTOF narrow pulse type pulse signal generation unit, and the control end receives control of pulse signals of the pulse generation module so that the laser transmitter outputs rectangular light detected by ITOF or narrow pulse light detected by DTOF.

Optionally, the pulse generating module includes a selection switch unit, and the switch unit can switch between the ITOF rectangular wave signal generating unit and the DTOF narrow pulse type pulse signal generating unit.

Optionally, the power module is a constant voltage source module, and can output signals with different amplitudes.

Optionally, the pulse generating module includes a delay fixing module, which may obtain the target delay by at least one of:

adaptive acquisition, user settings, system settings, calibration check settings, and the like,

and controlling the delay of the pulse generation module to the target delay.

Optionally, the pulse generating module includes a delay fixing module, and the delay fixing module includes a phase-locked loop unit, configured to configure a reference clock of the fixed delay module.

Optionally, the phase-locked loop unit is further configured to configure a bias voltage of the delay fixing module.

Optionally, the delay fixing module further includes a closed-loop feedback control module, where the feedback control module is configured to obtain delay information of the pulse generating module, and is configured to control the delay of the pulse generating module to reach the target delay.

Optionally, the pulse generating module receives a control signal of the ITOF rectangular wave signal or the DTOF narrow pulse type pulse signal in the pulse generating module.

Optionally, the pulse generating module corrects the waveform of the control signal to obtain a middle square wave signal with a larger pulse, and the pulse generating module further includes a narrow pulse generating unit, configured to convert the middle square wave signal into a pulse signal of the DTOF narrow pulse type with the same phase.

Optionally, the pulse generation module corrects the duty ratio of the control signal to obtain the ITOF rectangular wave signal satisfying the required duty ratio information.

The invention has the beneficial effects that: the embodiment of the invention provides a driving laser system, which is characterized by comprising: the power supply module is connected with the laser transmitter; the control unit comprises a control end, a first pole and a second pole, the first pole is connected with the laser emitter, the second pole is connected with the reference end, the control end is connected with the pulse generation module, the pulse generation module comprises an ITOF rectangular wave signal generation unit and a DTOF narrow pulse type pulse signal generation unit, the control end receives the control of the pulse signal of the pulse generation module, so that the laser emitter outputs rectangular light detected by ITOF or narrow pulse light detected by DTOF, a power supply of the system only needs one constant voltage source module with variable output amplitude value, a specific type-specific power supply is not needed, the DTOF detection narrow pulse in the pulse generation module and the rectangular light pulse detected by ITOF can be triggered by the same trigger signal, the reliability of a system signal source is ensured, and meanwhile, the simplification characteristic of the system is also ensured, and further, the system delay correction and the emission waveform verification are realized through modules such as feedback adjustment and the like, and the accurate and efficient effect of the detection system is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a prior art detection system;

FIG. 2 is a schematic diagram of a laser driving system according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a part of a pulse generation module according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a part of another pulse generation module according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a delay control unit according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an LVDS according to an embodiment of the present invention;

fig. 7 is a schematic diagram of an implementation of a pulse signal of a DTOF narrow pulse type according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a pulse signal generating unit of a DTOF narrow pulse type according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

The detection systems currently used basically comprise: the light source module 110, the processing module 120, and the light receiving module 130, the light source module 110 includes but is not limited to a semiconductor laser, a solid-state laser, and may also include other types of lasers, when a semiconductor laser is used as the light source, a Vertical-cavity surface-emitting laser VCSEL (Vertical-cavity surface-emitting laser) or an edge-emitting semiconductor laser EEL (edge-emitting laser) may be used, which is only exemplary and not particularly limited herein, the light source module 110 emits a sine wave, a square wave, a triangular wave, or a pulse wave, and in the ranging application, most of the lasers with a certain wavelength, such as 950nm or other infrared lasers (preferably, near-infrared lasers), the emitted light is projected into a field of view, the detected object 140 in the field of view may reflect the projected laser to form a return light, and the return light enters the detection system and is captured by the light receiving module 130, the optical receiving module 130 may include a photoelectric conversion unit, wherein the ITOF ranging can obtain delayed received signals of 0 °, 90 °, 180 ° and 270 ° by using the most commonly used four-phase delayed reception, and the four-phase distance calculation scheme is used here to exemplify a sine wave method, and the amplitude of the received signal is measured at four equidistant points (e.g., intervals of 90 ° or 1/4 λ):

the ratio of the difference between a1 and A3 to the difference between a2 and a4 is equal to the tangent of the phase angle. ArcTan is in fact a bivariate arctangent function, which can be mapped to the appropriate quadrant, defined as 0 ° or 180 ° when a2 ═ a4 and a1> A3 or A3> a1, respectively.

The distance to the target is determined by the following formula:

the distance measurement is carried out by determining the frequency of the emitted laser, where c is the speed of light,

is the phase angle (measured in radians) and f is the modulation frequency. The scheme can realize the effect of detecting the distance of the detected object in the field of view, and the scheme isThe scheme is called a four-phase delay scheme to obtain a detection result, the receiving module performs photoelectric conversion to generate different information, in some cases, a 0-degree and 180-degree two-phase scheme is used to obtain information of an object to be detected, documents also disclose 0-degree, 120-degree and 240-degree three-phase to obtain target information, and even documents also disclose a five-phase delay scheme, and the invention is not particularly limited.

In the DTOF ranging, because a pixel unit of the array sensor is an SPAD (single photon avalanche photodiode) device, the array sensor works in a geiger mode, in the geiger mode, the avalanche photodiode absorbs photons to generate electron-hole pairs, and the electron-hole pairs are accelerated under the action of a strong electric field generated by high reverse bias voltage so as to obtain enough energy and then collide with crystal lattices to form a linkage effect, and as a result, a large number of electron-hole pairs are formed to cause an avalanche phenomenon, and the current increases exponentially. At this time, the gain of the SPAD is theoretically infinite, and a single photon can saturate the photocurrent of the SPAD, so the SPAD becomes the first choice of a high-performance single photon detection system, the distance measurement principle is actually very simple, the light source emits pulse laser with a certain pulse width, for example, in the order of several nanoseconds (namely, narrow pulse detection light), the pulse laser is reflected by a detection target and returns to an array type receiving module containing the SPAD in an avalanche state, wherein the detection unit in the avalanche state can receive the returned signal, the distance between the detection system and the detection target can be output through the processing of the processing module, so as to complete the detection, wherein in order to obtain a result with high reliability, millions of laser pulses can be emitted, the detection unit obtains a statistical result, so that a more accurate distance can be obtained through the processing of the statistical result, and the two flight times (time of flight, TOF) scheme has different advantages in different detection scenes, for example, DTOF has greater advantages from the perspective of emitted light energy utilization, DTOF does not need a special structure or algorithm design to reduce or eliminate the multipath interference phenomenon compared with ITOF in coping with multipath interference in a field of view, while ITOF system is easy to integrate, does not need additional measurement circuits and algorithms, has greater advantages in a scene with higher integration requirements, and TOF type detection systems will dominate as subsequent application scenes become more common, so a system normalization design for driving laser is very necessary, which enables the whole detection to have higher maintainability and stronger scene interchange performance.

Fig. 2 is a schematic diagram of a laser driving system in a detection system disclosed in the present application, a processing module includes a pulse generating module 250, the pulse generating module 250 includes two modes of signal light driving units, which are an ITOF rectangular wave signal generating unit and a DTOF narrow pulse type pulse signal generating unit, respectively, both of which use the same signal to generate a blue book, that is, a control signal 270 (which includes two received complementary differential signals LVDSP and LVDSN) received by the signal generating module does not distinguish between ITOF and DTOF application scenarios, after the control signal is received by the signal generating module, the pulse generating module is selectively operated in a state of the ITOF rectangular wave signal generating unit or in a mode of the DTOF narrow pulse type pulse signal generating unit, so that the same control signal is used, so that the input of the whole system is simple, and the application scenarios are very wide, in fig. 2, the driving power supplies of the laser are uniform and need not be differentiated, only the amplitudes of the signals output by the power modules are different according to the selection of different states, for example, more power modules of the constant voltage source type are applied here, the output signal is the driving voltage, the voltage source only needs to output voltages of different magnitudes for different application scenarios, and the pulse signal output by the pulse generating module for specifically controlling the laser emission waveform (the power supply at this time is designed as a universal power supply, and it is not necessary to separately configure power supplies suitable for different emission modes), when the pulse output by the pulse generating module is a rectangular wave signal of ITOF, the rectangular wave signal is connected to the control terminal 2603 of the control unit 260, when the rectangular wave signal is at a high value, the first pole 2601 of the control unit 260 is communicated with the second pole 2602 thereof, the laser emitter connected to the power supplies may be connected between the power modules and the reference terminal 280 (which may be an actual ground connection terminal) Or a reference for stabilizing voltage, and is not limited herein), that is, a rectangular wave emitting light output with the same duty ratio as that of the rectangular wave signal of ITOF output by the pulse generating module can be output, similarly, when the pulse output by the pulse generating module is a pulse signal of DTOF narrow pulse type, and the high value of the narrow pulse signal is a high value output in the order of hundreds of thousands of picoseconds, that is, when the control terminal 2603 of the control unit 260 receives the high value conducting signal of the narrow pulse output, the laser emitter can output the same output of the narrow pulse emitting light, so as to complete the driving of the laser and the output of the specific type of laser signal, where the control unit can be a MOS type semiconductor device (either P-type channel or N-type channel) or a triode, and the control signal of the entire laser driving signal is the same homologous signal, the driving power supply is also designed into a module with difference in output amplitude, such as a constant voltage power supply, the actual difference is only in the working mode of the pulse signal generation module and the output signal mode of the output of the pulse signal generation module, the hardware implementation of the whole system is simpler and more convenient, and the reliability of the system is higher.

Fig. 3 is a partial structural schematic diagram of a pulse generating module provided in the present application, and the pulse generating module includes a switch unit similar to the structure of fig. 2, the switch unit is disposed between the received control signal and the output pulse signal, and it may be disposed in the transmission direction of the pulse signal from the control signal to the output, and is located at the upstream and/or downstream position of the ITOF rectangular wave signal generating unit and the DTOF narrow pulse type pulse signal generating unit, and optimally, in order to ensure that the internal interference of the system is small, the switch unit is disposed at the downstream position of the two units, the switch unit may also further isolate the two units from the output signal of the selecting unit, and ensure that the output signal is not affected by the interference, for example, the selecting unit may be a Multiplexer Unit (MUX), which may implement gating control of the signal, an isolation effect can also be achieved so that the internal interference of the whole system is small.

Fig. 4 is a schematic diagram of another pulse generation module provided in an embodiment of the present application, in which the pulse generation module includes a delay fixing module, and its main function is to ensure that the delay of the system is set to a preset delay, so that the influence factor of the delay on the result obtained by the TOF flight time is directly deducted at the algorithm end or in the subsequent processing, so as to obtain a more accurate flight time result, and implement more accurate distance detection, where the delay fixing module further includes a closed-loop feedback control module, the feedback control module is configured to obtain the delay information of the pulse generation module and is configured to control the delay of the pulse generation module to reach a target delay, the delay fixing module further includes a phase-locked loop unit, and the phase-locked loop unit is configured to configure, on one hand, a reference clock of the fixed delay module and, on the other hand, a bias voltage of the delay fixing module, the reference clock of the phase-locked loop configuration provides a reference of the system delay module, so that the delay of the delay module can keep an optimized or most fixed delay difference with a triggered control signal, the efficient and accurate driving of the whole driving system is ensured, the correction of the result in the flight time calculation is more accurate, the phase-locked loop unit can provide a bias voltage required by fixed delay for the delay line, and the delay line has PVT (PVT) resistance effect, (wherein P represents a process, the impurity concentration density, the oxide layer thickness and the diffusion depth can be deviated in the deposition or doping process, so that the resistance of the element is deviated from a threshold voltage, the width-length ratio of the element can be deviated due to the deviation of the resolution in the photoetching process, the deviation can cause the difference of the element performance, V represents a voltage, the delay of the element depends on the saturation current, while the saturation current depends on the supply voltage. Regardless of the multi-voltage domain chip, in the case of the single-voltage chip, the supply voltage of the battery varies within a range, and then the error of the off-chip or on-chip voltage regulator is added with the IR, each tube on one chip may operate at a different voltage, and thus the performance is different; t represents a temperature, and in a daily operation, an IC chip must be adapted to an environment where a temperature is not constant, and when the chip operates, the temperature inside the chip varies due to switching power consumption, short-circuit power consumption, and leakage power consumption. The effect of temperature fluctuations on performance is generally considered linear, but at deep sub-micron temperatures the effect on performance is non-linear. For a tube, as the temperature increases, the hole/electron mobility slows down, increasing the delay, while at the same time the temperature increase also lowers the threshold voltage of the element, a lower threshold voltage meaning a higher current and therefore a reduced delay of the element. Since the temperature rise generally affects the moving speed of holes/electrons more than the threshold voltage, the delay time of the temperature rise element tends to increase. However, the transistor element has a temperature flip effect because the delay time of the element is not smaller as the temperature is lower, and the delay time of the element is increased as the temperature is lower after the temperature is lowered to a certain value, and the temperature flip point is related to a specific process. ) The invention also discloses a high-quality performance evaluation basis of an IC chip with strong performance, temperature change, voltage fluctuation, process deviation caused in the manufacturing process and the like in the application range of the IC chip can affect the deviation of a delay fixing module, the PLL unit in the delay fixing module of the invention realizes the correction of bias voltage autonomously, further ensures the delay controllability of the system, and enables the final system to accurately output the final distance information of a detected object after the correction algorithm, namely to obtain the most accurate flight time detection result, a closed-loop feedback control module is also included in the pulse generation module, the feedback control module is used for obtaining the delay information of the pulse generation module and controlling the delay of the pulse generation module to a target delay, and the feedback control module can obtain initial information triggered by a control signal, the final information of the driving signal output by the whole module is obtained at the output end of the pulse generating module through a feedback closed loop, and the final control signal is obtained through comparison between the final control signal and the feedback closed loop, so that the delay of the delay fixing module is accurately fixed, and the delay information required to be adjusted by the system can obtain the target delay through at least one of the following modes: the calibration check refers to calibrating the target delay of the system according to actual results of parameters based on parameters in certain scenes, and controlling the delay of the pulse generation module to reach the target delay by the delay fixing module after the target delay is obtained.

Fig. 5 is a schematic diagram of an embodiment of a pulse generation module according to the present invention, in which a control signal enters an LVDS unit (LVDS is a low swing differential signaling technology that enables signals to be transmitted at a rate of several hundred Mbps over a differential PCB line pair or a balanced cable, and low noise and low power consumption are achieved at low voltage amplitude and low current driving output). the LVDS unit according to the present invention is schematically illustrated in fig. 6, and includes a differential amplifier unit followed by a single-ended amplifier to convert the control signal into a desired intermediate control waveform signal, wherein + of the differential amplifier is connected to a positive pole of the low voltage differential signal, denoted as LVDSP, and-of the differential amplifier is connected to a negative pole of the low voltage differential signal, denoted as LVDSN, which enables signals to be transmitted at a rate of several hundred Mbps over the differential PCB line pair or the balanced cable, the low voltage amplitude and low current driving output of the Delay locked loop unit realize low noise and low power consumption, and ensure the characteristic of low Delay of the whole system, the signal after passing through the LVDS unit is transmitted to the Delay fixing module, wherein the Delay-line is a fixed Delay configuration element for realizing the Delay fixing module, the structure of the Delay-line is shown in FIG. 7 and is composed of a plurality of Delay units which can be selected, the Delay of the whole driving system after being processed by the Delay-line unit can be controlled to a target Delay, in order to ensure the accuracy of detection and the accuracy of system Delay, the fixed Delay configuration element receives the signal of the phase locked loop unit PLL, on one hand, the unit can provide the reference clock principle of the Delay fixing module as described before, and is not described herein again, on the other hand, the Delay line can also be provided with bias voltage required by fixed Delay, so that the Delay line has PVT-resistant Delay time performance, a MUX type selection unit is connected behind the configuration unit, the unit selectively outputs a pulse driving signal between the ITOF rectangular wave signal generation unit and the DTOF narrow pulse type pulse signal generation unit, the MUX selection unit also has the capability of isolating interference, another MUX unit is also arranged behind the two types of driving signal generation units, the selection unit can further isolate interference in the system, the reliability of the system is realized by ensuring that the influence of the interference in the system is small, wherein the ITOF rectangular wave signal generation unit is duty cal here, of course, a feedback adjusting ring can be included here, the adjusting ring can be used for correcting the duty ratio of the ITOF rectangular wave signal so as to realize that the output waveform of the system meets the requirement, the DTOF narrow pulse type pulse generation unit is an N-pulse unit in the figure, and a narrow pulse sequence meeting the requirement can be generated through the MUX type selecting unit, therefore, the DTOF detection is achieved, a final output signal is collected at the output end of the pulse generation module and fed back to the TDC to obtain the current delay information of the whole system, the TDC stops counting after receiving the stop signal to obtain the current system delay information, the information is sent to the MCU control module, the number of delay unit selections of the fixed delay configuration unit can be controlled according to the difference from the target delay, the number of delay units selected here determines the final delay data configured for the system by the final fixed delay configuration unit, the whole working principle is similar to the process described before, and details are not repeated here.

Fig. 8 is a schematic diagram of a pulse signal generated by a pulse signal generating unit of a DTOF narrow pulse type according to an embodiment of the present disclosure, where a control signal is shown in the uppermost portion of fig. 8, where the narrow pulse signal triggering is implemented in a digital manner as an example (but not limited to this, the pulse width and the pulse signal may also be determined by two analog signals having a delay time relationship), the control signal triggers a counter, the narrow pulse signal is a high-value trigger point, and a required narrow pulse signal is configured by configuring different counter pulse numbers, where a count period of each counter may be on the order of hundred picoseconds, such as 500ps, 600ps, and so on, and is not limited to this, and different pulse widths may be configured by different pulse numbers, such as a count period of the counter is T₀Each pulse width comprising a number of n pulses,the pulse width generated is then n x T₀The present invention is not limited to this embodiment, and is also illustrative.

The driving laser system provided by the invention is provided with a laser pulse driving circuit compatible to be used in ITOF and DTOF, and can select a square wave with an output duty ratio of 50% according to the use requirement, the duty ratio of the square wave is not limited to the above, and a pulse driving waveform of a narrow pulse can also be selected to be output, the circuit has a fixed delay function, an input signal and a driving output signal are sampled by using a TDC, delay calculation is carried out in an MCU and compared with a target delay, then the total delay time of the circuit is locked to the target delay by controlling the delay time of a delay line so as to improve the ranging precision, the circuit can calibrate the output control waveform under the application scene of the DTOF, namely the square wave with larger pulse can be input, the square wave can be converted into the narrow pulse with the same phase by a narrow pulse generating circuit in the circuit, the pulse width can be configured according to the use requirement of ranging, in an ITOF application scenario, duty cycle calibration may be performed on an output control waveform, that is, duty cycle adjustment may be performed on an input square wave, and a 50% duty cycle is usually used in an ITOF application scenario, so that the present circuit may perform duty cycle adjustment on an input waveform in an ITOF application scenario, in the circuit, a PLL may provide a reference clock for a TDC circuit and may also provide a bias voltage required for fixed delay for a delay line, so that the delay line has a delay time against PVT, the delay line in the circuit may also be implemented by using a counter, and the circuit may also perform sampling measurement on a pulse width of a control signal output by a buffer, and other advantages are not described in detail herein.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A drive laser system, comprising:

2. The driving laser system according to claim 1, wherein the pulse generating module comprises a selection switch unit capable of switching between the ITOF rectangular wave signal generating unit and the DTOF narrow pulse type pulse signal generating unit.

3. The driven laser system of claim 1, wherein the power module is a constant voltage power module capable of outputting output signals with different amplitudes.

4. The driven laser system of claim 1, wherein the pulse generation module comprises a delay fixing module that obtains the target delay by at least one of:

adaptive acquisition, user settings, system settings, calibration settings, etc., and controls the delay of the pulse generation module to the target delay.

5. The driving laser system according to claim 1, wherein the pulse generating module comprises a delay fixing module comprising a phase locked loop unit for configuring a reference clock of the fixed delay module.

6. The driving laser system according to claim 5, wherein the phase locked loop unit is further configured to configure a bias voltage of the delay fixing module.

7. The driven laser system of claim 4, wherein the delay fixing module further comprises a closed-loop feedback control module for obtaining delay information of the pulse generating module and for controlling the delay of the pulse generating module to the target delay.

8. The driving laser system according to claim 1, wherein the pulse generation module receives a control signal of the ITOF rectangular wave signal or the DTOF narrow pulse type pulse signal in the pulse generation module.

9. The system as claimed in claim 8, wherein the pulse generation module corrects the waveform of the control signal to obtain an intermediate square-wave signal with larger pulses, and further comprises a narrow pulse generation unit for converting the intermediate square-wave signal into a pulse signal of the DTOF narrow pulse type with the same phase.

10. The driven laser system of claim 8, wherein the pulse generation module performs duty cycle correction on the control signal to obtain the ITOF rectangular wave signal satisfying the required duty cycle information.