CN116435865B - Laser diode driving control circuit - Google Patents
Laser diode driving control circuit Download PDFInfo
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- CN116435865B CN116435865B CN202310466813.9A CN202310466813A CN116435865B CN 116435865 B CN116435865 B CN 116435865B CN 202310466813 A CN202310466813 A CN 202310466813A CN 116435865 B CN116435865 B CN 116435865B
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- 238000012544 monitoring process Methods 0.000 claims abstract description 63
- 230000003750 conditioning effect Effects 0.000 claims abstract description 42
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- 238000006243 chemical reaction Methods 0.000 claims description 68
- 238000001514 detection method Methods 0.000 claims description 52
- 230000033228 biological regulation Effects 0.000 claims description 21
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- 238000010586 diagram Methods 0.000 description 11
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- 230000003287 optical effect Effects 0.000 description 8
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application relates to a laser diode driving control circuit which comprises a laser monitoring module, a reference voltage conditioning module, a current regulating module and a current driving module. The laser monitoring module monitors the working state of the laser diode and outputs a corresponding current signal, the reference voltage conditioning module conditions the reference signal to obtain a reference voltage, the current adjusting module sends an adjusting instruction to the current driving module according to the current signal and the reference voltage, and the current driving module generates driving current according to the adjusting instruction and transmits the driving current to the laser diode. The reference signal is a signal generated in the signal processing process of the analog laser monitoring module. The generation process of the reference signal simulates the signal processing process of the laser monitoring module, the reference voltage is obtained according to the reference signal, and the adjustment instruction is generated based on the reference voltage and the current signal output by the laser monitoring module and is used as the basis for controlling the laser diode, so that the laser diode is driven and controlled more accurately.
Description
Technical Field
The application relates to the technical field of laser driving, in particular to a laser diode driving control circuit.
Background
A Laser Diode (LD), also known as a laser, is a current device that emits laser light only when the forward current it passes exceeds a threshold current. The threshold current of the laser increases with increasing temperature, while the electro-optical conversion efficiency decreases with increasing temperature. In order to keep the extinction ratio unchanged, the threshold current and modulation current of the laser must be increased when the temperature increases, and reduced when the temperature decreases.
In the conventional art, a high-speed current mirror is used to mirror the output current of the laser, and the optical power P1 when the input signal is 1 and the optical power P0 when the input signal is 0 are detected. And then a comparator is arranged to compare the detected signal with a preset target current, and the bias current and the modulation current are regulated according to the comparison result so as to keep the extinction ratio and the average optical power unchanged. But for high speed signals the bandwidth limitations of the current mirror can lead to a degradation of the current accuracy of the mirror. Moreover, when advanced process is used, the effect peculiar to the advanced process may cause difficulty in optimizing the current mirror on the layout level, and the mismatch of the current mirror may become more serious to affect the accuracy of the mirror current. Therefore, when the driving control of the laser is performed using the galvanometer mirror, a problem of insufficient accuracy is likely to occur.
Disclosure of Invention
Accordingly, it is necessary to provide a laser diode drive control circuit capable of precisely driving and controlling a laser diode.
The application provides a laser diode driving control circuit, comprising:
the laser monitoring module is used for monitoring the working state of the laser diode and outputting a corresponding current signal;
The reference voltage conditioning module is used for conditioning the reference signal to obtain a reference voltage; the reference signal is a signal generated in the signal processing process of the simulation laser monitoring module;
The current adjusting module is connected with the laser monitoring module and the reference voltage conditioning module and is used for sending an adjusting instruction to the current driving module according to the current signal and the reference voltage;
and the current driving module generates driving current according to the adjusting instruction and transmits the driving current to the laser diode.
In one embodiment, the reference voltage conditioning module comprises:
the reference voltage simulation unit is used for conditioning a reference signal and outputting a reference current;
the first voltage conversion unit is connected with the reference voltage simulation unit, receives the reference current and outputs an initial reference voltage corresponding to the reference current;
The first voltage output unit is connected with the first voltage conversion unit and the current regulation module, and is used for regulating the initial reference voltage to obtain a reference voltage and outputting the reference voltage to the current regulation module.
In one embodiment, the reference voltage analog unit is a feed-forward equalization circuit.
In one embodiment, the first voltage conversion unit is a current-voltage conversion circuit.
In one embodiment, the first voltage output unit includes a first peak detection circuit and a first filter circuit, the first peak detection circuit is connected to the first voltage conversion unit, the current regulation module and the first filter circuit, and the first filter circuit is connected to the first voltage conversion unit and the current regulation module; the reference voltage comprises a filtered initial reference voltage and a peak value processed initial reference voltage; wherein,
The first filter circuit is connected with the initial reference voltage, filters the initial reference voltage to obtain the filtered initial reference voltage, and transmits the filtered initial reference voltage to the first peak value detection circuit and the current regulation module;
The first peak value detection circuit generates the initial reference voltage after peak value processing according to the accessed initial reference voltage and the filtered initial reference voltage, and outputs the initial reference voltage to the current regulation module.
In one embodiment, the current regulation module comprises:
the second voltage conversion unit is connected with the laser monitoring module and used for converting the current signal into a voltage signal;
The second voltage output unit is connected with the second voltage conversion unit and is used for conditioning the voltage signal to obtain output voltage;
The voltage comparison unit is connected with the second voltage output unit and the reference voltage conditioning module and is used for comparing the output voltage with the reference voltage and outputting a comparison result;
And the control unit is connected with the voltage comparison unit and the current driving module, and is used for generating the adjusting instruction according to the comparison result and sending the adjusting instruction to the current driving module.
In one embodiment, the second voltage output unit includes a second peak detection circuit and a second filter circuit, the second peak detection circuit is connected to the second voltage conversion unit, the voltage comparison unit and the second filter circuit, and the second filter circuit is connected to the second voltage conversion unit and the voltage comparison unit; the output voltage comprises a filtered voltage signal and a peak processed voltage signal; wherein,
The second filter circuit is connected with the voltage signal, filters the voltage signal to obtain the filtered voltage signal, and transmits the filtered voltage signal to the second peak value detection circuit and the voltage comparison unit;
The second peak detection circuit generates the peak processed voltage signal according to the accessed voltage signal and the filtered voltage signal and outputs the peak processed voltage signal to the voltage comparison unit.
In one embodiment, the voltage comparing unit includes a first comparator and a second comparator, the positive input end of the first comparator is connected with the second peak detection circuit, the positive input end of the second comparator is connected with the second filter circuit, the negative input end of the first comparator and the negative input end of the second comparator are both connected with the reference voltage conditioning module, and the output end of the first comparator and the output end of the second comparator are both connected with the control unit.
In one embodiment, the current drive module is a digital to analog converter.
In one embodiment, the laser monitoring module includes a monitor photodiode.
The laser diode driving control circuit comprises a laser monitoring module, a reference voltage conditioning module, a current regulating module and a current driving module. The laser monitoring module monitors the working state of the laser diode and outputs a corresponding current signal, the reference voltage conditioning module conditions the reference signal to obtain a reference voltage, the current adjusting module sends an adjusting instruction to the current driving module according to the current signal and the reference voltage, and the current driving module generates driving current according to the adjusting instruction and transmits the driving current to the laser diode. The reference signal is a signal generated in the signal processing process of the analog laser monitoring module. The generation process of the reference signal simulates the signal processing process of the laser monitoring module, the reference voltage is obtained according to the reference signal, the adjustment instruction is generated based on the reference voltage and the current signal output by the laser monitoring module and is used as the basis for controlling the laser diode, the deviation caused by the thyristor process or component transmission error in the laser monitoring module can be reduced, the accuracy of the reference voltage acquired by the current adjusting module is ensured, the adjustment instruction sent by the current adjusting module is more accurate, the accuracy of the driving current generated by the current driving module is further improved, and the more accurate driving control of the laser diode is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of an application scenario of a laser diode driving control circuit in one embodiment;
FIG. 2 is a schematic diagram of a driving control circuit of a laser diode according to one embodiment;
FIG. 3 is a circuit diagram of a laser diode in one embodiment;
FIG. 4 is a schematic diagram of a reference voltage conditioning module of FIG. 2;
FIG. 5 is a schematic diagram of a feedforward equalization circuit in one embodiment;
FIG. 6 is a schematic diagram of a structure of the first voltage output unit in FIG. 4;
FIG. 7 is a schematic diagram of a structure of the current regulation module in FIG. 2;
FIG. 8 is a schematic diagram of a structure of the second voltage output unit in FIG. 7;
FIG. 9 is a schematic diagram of a structure of the voltage comparing unit in FIG. 7;
fig. 10 is a circuit configuration diagram of a laser diode driving control circuit in one embodiment.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
It is understood that "at least one" means one or more and "a plurality" means two or more. "at least part of an element" means part or all of the element.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The laser diode driving control circuit 104 provided by the embodiment of the application can be applied to an application environment as shown in fig. 1. The laser diode 102 is connected to the laser diode driving control circuit 104, and the laser diode driving control circuit 104 outputs a driving current to drive the laser diode 102. In addition, the laser diode driving control circuit 104 can correspondingly adjust the driving current of the laser diode driving control circuit 104 according to the working state of the laser diode 102, so as to adjust the working state of the laser diode 102. The operating state of the laser diode 102 may include an average optical power, which is the average power of the laser light emitted from the laser diode 102, and an extinction ratio, which is the ratio of the optical power P1 emitted from the laser diode 102 when emitting the all "1" code to the optical power P0 emitted from the all "0" code.
In one embodiment, as shown in FIG. 2, the laser diode drive control circuit 104 includes a laser monitoring module 202, a reference voltage conditioning module 204, a current regulation module 206, and a current drive module 208. The laser monitoring module 202 monitors the operating state of the laser diode 102 and outputs a corresponding current signal. The reference voltage conditioning module 204 conditions the reference signal to obtain a reference voltage. The current adjusting module 206 is connected to the laser monitoring module 202 and the reference voltage conditioning module 204, and is configured to send an adjusting command to the current driving module 208 according to the current signal and the reference voltage. The current driving module 208 generates a driving current according to the adjustment command and transmits the driving current to the laser diode 102.
The reference signal is a signal generated during the signal processing of the analog laser monitoring module 202, and the signal processing of the reference signal and the current signal output by the laser monitoring module 202 are similar by the signal processing method of the analog laser monitoring module 202, so that the signal conversion process is similar. The input currents obtained by the current driving module 208 and the reference voltage conditioning module 204 are the same current.
Specifically, the laser monitoring module 202 monitors the operation state of the laser diode 102, that is, obtains the laser output parameter of the laser diode 102, and outputs a current signal corresponding to the laser output parameter to the current adjusting module 206 according to the operation state of the laser diode 102. The reference voltage conditioning module 204 simulates the processing procedure of the laser monitoring module 202 on the output signal, that is, the processing procedure of converting the laser output parameter into the corresponding current signal, so as to ensure the matching degree of the reference signal and the output signal of the laser monitoring module 202. The reference voltage conditioning module 204 also conditions the reference signal to obtain a reference voltage.
The current adjusting module 206 is connected with the laser monitoring module 202 and the reference voltage conditioning module 204, and obtains a current signal output by the laser monitoring module 202 and a reference voltage output by the reference voltage conditioning module 204. The current adjustment module 206 conditions the current signal to obtain a voltage signal, and then analyzes the voltage signal and the reference voltage. The current regulation module 206 obtains a regulation command according to the voltage signal and the reference voltage analysis, and sends the regulation command to the current driving module 208. The current driving module 208 generates a driving current according to the adjustment command, and transmits the driving current to the laser diode 102 connected to the current driving module 208. The driving current is used to drive the laser diode 102, and change the operating state of the laser diode 102. The working state of the laser diode 102 is a source of current signals output by the laser monitoring module 202, so that closed-loop driving control of the laser diode 102 can be realized.
Alternatively, the laser monitoring module 202 may be connected to the laser diode 102 to directly monitor the operation state of the laser diode 102. Alternatively, the laser monitoring module 202 may be disposed beside the laser diode 102 and fixed relative to the position of the laser diode 102. In this case, the laser monitoring module 202 receives the laser output intensity of the laser diode 102, and obtains the working state of the laser diode 102 after converting the optical energy into the electrical energy. Preferably, in order to completely detect the working state of the laser diode 102, the laser monitoring module 202 is connected to the laser diode 102 to monitor the working state of the laser diode 102.
Alternatively, a circuit configuration diagram of the laser diode 102 may include a laser emitting diode LD and a laser feedback diode PD connected in parallel as shown in fig. 3. The laser diode 102 that is drive-controlled in the present application may refer to only the laser light emitting diode LD in fig. 3, or may refer to the entire circuit in fig. 3. In the case where the laser diode 102 is only the laser diode LD in fig. 3, the laser monitoring module 202 may be a monitoring circuit including a laser feedback diode PD to monitor the operation state of the laser diode 102. In the present application, the laser diode 102 that is driven and controlled refers to the laser diode LD in fig. 3 alone or refers to the whole circuit in fig. 3, the laser monitoring module 202 may also be a component capable of receiving the laser light emitted by the laser diode LD and related circuits, such as a photosensitive element. In the present application, the laser monitoring module 202 may take other forms regardless of the form of the laser diode 102, and is not limited to the forms mentioned in the embodiments of the present application, as long as it can detect the operation state of the laser diode 102 and output a corresponding current signal.
In this embodiment, the laser diode driving control circuit 104 includes a laser monitoring module 202, a reference voltage conditioning module 204, a current adjusting module 206, and a current driving module 208. The laser monitoring module 202 monitors the working state of the laser diode 102 and outputs a corresponding current signal, the reference voltage conditioning module 204 conditions the reference signal to obtain a reference voltage, the current adjusting module 206 sends an adjusting command to the current driving module 208 according to the current signal and the reference voltage, and the current driving module 208 generates a driving current according to the adjusting command and transmits the driving current to the laser diode 102. The reference signal is a signal generated during the signal processing of the analog laser monitoring module 202. The generation process of the reference signal simulates the signal processing process of the laser monitoring module, the reference voltage is obtained according to the reference signal, the adjustment instruction is generated based on the reference voltage and the current signal output by the laser monitoring module, and the adjustment instruction is used as the basis for controlling the laser diode, so that deviation caused by the thyristor process or component transmission error in the laser monitoring module can be reduced.
In one embodiment, as shown in fig. 4, the reference voltage conditioning module 204 includes a reference voltage analog unit 402, a first voltage conversion unit 404, and a first voltage output unit 406. The reference voltage analog unit 402 is used for conditioning a reference signal and outputting a reference current. The first voltage conversion unit 404 is connected to the reference voltage analog unit 402, receives the reference current, and outputs an initial reference voltage corresponding to the reference current. The first voltage output unit 406 is connected to the first voltage conversion unit 404 and the current adjustment module 206, and is configured to condition an initial reference voltage to obtain a reference voltage, and output the reference voltage to the current adjustment module 206.
The reference voltage conditioning module 204 needs to condition the reference signal and output a reference voltage. Specifically, the reference voltage analog unit 402 is connected to an input signal, and performs analog processing on the input signal according to the structure and the signal processing process in the laser monitoring module 202 to obtain a reference signal. The reference voltage analog unit 402 conditions the reference signal again and outputs a reference current. The first voltage conversion unit 404 is connected to the reference voltage analog unit 402, receives the reference current, and performs voltage conversion to obtain an initial reference voltage corresponding to the reference current. The first voltage output unit 406 is connected to the first voltage conversion unit 404, conditions the initial reference voltage to be the reference voltage, and outputs the reference voltage to the current adjustment module 206.
Optionally, the reference voltage simulation unit 402 performs simulation processing on the input signal according to the structure and the signal processing procedure in the laser monitoring module 202, and when obtaining the reference signal, the reference voltage simulation unit includes the following two situations: first, the reference voltage simulation unit 402 is used by a worker to adjust parameters or structures for simulating the structures and signal processing processes in the laser monitoring module 202, and obtains a reference signal. Second, the reference voltage simulation unit 402 is connected with a device with processing capability, such as an intelligent chip or a microprocessor, and the device can acquire a signal processing process in the laser monitoring module 202, and can control the reference voltage simulation unit 402 to implement simulation processing on an input signal, so as to obtain a reference signal.
In the present embodiment, the reference voltage conditioning module 204 includes a reference voltage analog unit 402, a first voltage conversion unit 404, and a first voltage output unit 406. The reference voltage analog unit 402 conditions the reference signal to obtain a reference current, the first voltage conversion unit 404 converts the reference current into an initial reference voltage, and the first voltage output unit 406 outputs the reference voltage to the current adjustment module 206. The reference voltage conditioning module 204 makes the reference signal correspond to the output signal of the laser monitoring module 202, and conditions the reference signal to obtain a reference voltage, so that the accuracy and the authenticity of the reference voltage are ensured, and the driving accuracy of the laser diode driving control circuit 104 is increased.
In one embodiment, the reference voltage analog unit 402 is a feed-forward equalization circuit, also known as FFE circuit (Feed Forward Equalization feed-forward equalization). The feedforward equalization circuit is used for pre-equalizing signals. Firstly, delaying the input signals, adding the delayed signals according to different weights, and then summing, and adjusting the equalization strength by controlling the weights.
Alternatively, the internal configuration of the feed-forward equalizing circuit is not limited. Illustratively, a circuit configuration of a feed forward equalization circuit is shown in fig. 5, including a signal input 502, a signal delay module 504, a signal pre-emphasis module 506, and a signal output 508. The signal input 502 receives an input signal and transmits the input signal to the signal delay module 504, and the signal delay module 504 receives the input signal, delays the input signal, and transmits the delayed input signal to the signal pre-emphasis module 506. The signal pre-emphasis module 506 receives the delayed input signal, and weights the delayed input signal according to a set weight to obtain a reference signal. The signal output terminal 508 is configured to convert the reference signal into a reference current output, and in this embodiment, the signal output terminal 508 outputs the reference current to the first voltage conversion unit 404.
In the process of outputting a current signal after the laser monitoring module 202 monitors the working state of the laser diode 102, the transmitted current signal is gradually distorted along with the improvement of the thyristor process of the components in the laser monitoring module 202 and the transmission error among the components, so that a certain deviation is caused. However, the input signal has no deviation, and if the input signal is directly transmitted to the current adjustment module 206 as the reference voltage, the adjustment command of the output of the current adjustment module 206 is not accurate enough due to the deviation. In order to ensure the accuracy of the laser diode driving control circuit 104, then, an equalization technique is used to simulate the input signal corresponding to the output signal behavior of the laser monitoring module 202. I.e., the input signal is conditioned using a feed-forward equalizer circuit to have a deviation that matches the current signal output by the laser monitoring module 202. The accuracy of the laser diode driving control circuit 104 can be improved by the analog output of the feedforward equalization circuit.
In one embodiment, the first voltage conversion unit 404 is a current-to-voltage conversion circuit.
Specifically, the current-to-voltage conversion circuit is capable of converting a current into a voltage, and in this embodiment, the current-to-voltage conversion circuit receives a reference current and converts the reference current into an initial reference voltage output. The circuit configuration of the current-voltage conversion circuit is not limited, and a current-voltage conversion function may be realized.
In one embodiment, as shown in fig. 6, the first voltage output unit 406 includes a first peak detection circuit 602 and a first filter circuit 604, the first peak detection circuit 602 is connected to the first voltage conversion unit 404, the current adjustment module 206 and the first filter circuit 604, and the first filter circuit 604 is connected to the first voltage conversion unit 404 and the current adjustment module 206.
Wherein the reference voltage includes a filtered initial reference voltage and a peak processed initial reference voltage.
Specifically, the first filter circuit 604 is connected to the initial reference voltage, filters the initial reference voltage to obtain a filtered initial reference voltage, and transmits the filtered initial reference voltage to the first peak detection circuit 602 and the current adjustment module 206. The first peak detection circuit 602 compares the accessed initial reference voltage with the filtered initial reference voltage according to the accessed initial reference voltage and the filtered initial reference voltage, specifically, subtracts the filtered initial reference voltage from the accessed initial reference voltage. The first peak detection circuit 602 generates a peak-processed initial reference voltage and outputs the peak-processed initial reference voltage to the current adjustment module 206. If the initial reference voltage from the first voltage conversion unit 404 connected to the first peak detection circuit 602 is a waveform voltage, the filtered initial reference voltage is a stable value, and the initial reference voltage after the peak processing is also the waveform voltage.
In the present embodiment, the first voltage output unit 406 includes a first peak detection circuit 602 and a first filter circuit 604. The initial reference voltage is processed differently by the first peak detection circuit 602 and the first filter circuit 604, and a reference voltage is output, so that the current adjustment module 206 can send an adjustment command according to the reference voltage. The stability of the overall drive control can be improved by the stable output of the reference voltage.
In one embodiment, as shown in fig. 7, the current regulation module 206 includes a second voltage conversion unit 702, a second voltage output unit 704, a voltage comparison unit 706, and a control unit 708.
Specifically, the second voltage conversion unit 702 is connected to the laser monitoring module 202, and converts the current signal into a voltage signal. The second voltage output unit 704 is connected to the second voltage conversion unit 702, and conditions the voltage signal to obtain an output voltage. The voltage comparing unit 706 is connected to the second voltage output unit 704 and the reference voltage conditioning module 204, and compares the output voltage with the reference voltage, and outputs a comparison result. Alternatively, the voltage comparing unit 706 may be a comparator, or any device or structure that may implement voltage comparison. The control unit 708 generates an adjustment command according to the comparison result output by the voltage comparison unit 706, and sends the adjustment command to the current driving module 208, so as to control the current driving module 208 to generate a driving current according to the adjustment command, and drive the laser diode 102.
Further, the second voltage converting unit 702 converts the current signal into a voltage signal, and the first voltage converting unit 404 converts the reference current into an initial reference voltage. Since the second voltage conversion unit 702 and the first voltage conversion unit 404 both implement a function of converting a current into a voltage in the laser diode driving control circuit 104, the circuit structures of the second voltage conversion unit 702 and the first voltage conversion unit 404 may be the same circuit structure, that is, the second voltage conversion unit 702 may be a current-voltage conversion circuit.
The second voltage output unit 704 conditions the voltage signal to obtain an output voltage; the first voltage output unit 406 conditions the initial reference voltage to obtain a reference voltage. Since the second voltage output unit 704 and the first voltage output unit 406 both implement voltage conditioning in the laser diode driving control circuit 104, the circuit structures of the second voltage output unit 704 and the first voltage output unit 406 may be the same circuit structure, that is, the second voltage output unit 704 may also be a combined circuit structure of the peak detection circuit and the filter circuit.
In one embodiment, as shown in fig. 8, the second voltage output unit 704 includes a second peak detection circuit 802 and a second filter circuit 804, where the second peak detection circuit 802 is connected to the second voltage conversion unit 702, the voltage comparison unit 706, and the second filter circuit 804 is connected to the second voltage conversion unit 702 and the voltage comparison unit 706.
Wherein the output voltage comprises a filtered voltage signal and a peak processed voltage signal.
Specifically, the second filter circuit 804 is connected to the voltage signal, filters the voltage signal to obtain a filtered voltage signal, and transmits the filtered voltage signal to the second peak detection circuit 802 and the voltage comparison unit 706. The second peak detection circuit 802 compares the accessed voltage signal with the filtered voltage signal, specifically, subtracts the filtered voltage signal from the accessed voltage signal, based on the accessed voltage signal and the filtered voltage signal. The second peak detection circuit 802 generates a peak-processed voltage signal and outputs the voltage signal to the voltage comparison unit 706. If the voltage signal from the second voltage conversion unit 702 connected to the second peak detection circuit 802 is a waveform voltage, the filtered voltage signal is a stable value, and the voltage signal after the peak processing is also a waveform voltage.
In the present embodiment, the second voltage output unit 704 includes a second peak detection circuit 802 and a second filter circuit 804. The voltage signal is processed differently by the second peak detection circuit 802 and the second filter circuit 804 to obtain an output voltage, so that the voltage comparing unit 706 can conveniently compare the output voltage with the reference voltage obtained by the reference voltage conditioning module 204.
In one embodiment, as shown in fig. 9, the voltage comparison unit 706 includes a first comparator 902 and a second comparator 904.
The voltage comparing unit 706 may be comparators, and a specific number may be two, including a first comparator 902 and a second comparator 904, for comparing magnitudes of the output voltage and the reference voltage. Correspondingly, the comparison result includes a first comparison result output by the first comparator 902 and a second comparison result output by the second comparator 904. Specifically, the positive input end of the first comparator 902 is connected to the second peak detection circuit 802, the positive input end of the second comparator 904 is connected to the second filter circuit 804, and the negative input end of the first comparator 902 and the negative input end of the second comparator 904 are both connected to the reference voltage conditioning module 204. The first comparator 902 compares the voltage signal after peak processing with the reference voltage output by the reference voltage conditioning module 204 to obtain a first comparison result, and the second comparator 904 compares the filtered voltage signal with the reference voltage output by the reference voltage conditioning module 204 to obtain a second comparison result. The output end of the first comparator 902 and the output end of the second comparator 904 are both connected with the control unit 708, and by sending the first comparison result and the second comparison result to the control unit 708, the control unit 708 is facilitated to send an adjustment instruction according to the comparison result.
For example, when the voltage comparing unit 706 includes the first comparator 902 and the second comparator 904, the control unit 708 may be a counter. The counter counts according to the comparison result, specifically: the first comparator 902 and the second comparator 904 are both comparators capable of outputting 1 or 0 as a comparison result, and when the comparison results output by the first comparator 902 and the second comparator 904 are both 1, the counter performs a 1-up action; when the comparison results output from the first comparator 902 and the second comparator 904 are both 0; the counter performs a decrementing 1 action; when one of the comparison results output by the first comparator 902 and the second comparator 904 is 1 and the other is 0, the counter keeps the original count unchanged. The counter sends the count condition in the counter as an adjustment command to the current drive module 208. Further, the counter has a set maximum value and a set minimum value, the 1-up action is not executed when the count of the counter reaches the maximum value, and the 1-down action is not executed when the count of the counter reaches the minimum value. Optionally, to match the first comparator 902 and the second comparator 904, the number of the counters is also 2, including a first counter and a second counter, where the first counter is connected to the first comparator 902, the second counter is connected to the second comparator 904, and the first counter and the second counter are both connected to the current driving module 208. At this time, the first counter and the second counter count according to the comparison result, specifically: when the first comparison result output by the first comparator 902 is 1, the first counter performs a 1-up action; when the first comparison result output by the first comparator 902 is 0, the first counter performs a 1-reduction action. When the second comparison result output by the second comparator 904 is 1, the second counter performs a 1-adding action; when the second comparison result output by the second comparator 904 is 0, the second counter performs the 1-reduction action.
When the reference voltage conditioning module 204 includes the first peak detection circuit 602 and the first filter circuit 604, the positive input end of the first comparator 902 is connected to the second peak detection circuit 802, so as to obtain a peak-processed voltage signal output by the second peak detection circuit 802; the negative input terminal of the first comparator 902 is connected to the first peak detection circuit 602, and obtains the initial reference voltage after the peak processing output by the first peak detection circuit 602. The first comparator 902 compares the voltage signal after the peak processing with the initial reference voltage after the peak processing, to obtain a first comparison result. The positive input end of the second comparator 904 is connected with the second filter circuit 804, and a filtered voltage signal output by the second filter circuit 804 is obtained; the negative input terminal of the second comparator 904 is connected to the first filter circuit 604, and obtains the filtered reference voltage output by the first filter circuit 604. The second comparator 904 compares the filtered voltage signal with the filtered reference voltage to obtain a second comparison result.
In this embodiment, the first comparator 902 compares the peak-processed voltage signal with the peak-processed initial reference voltage, and the second comparator 904 compares the filtered voltage signal with the filtered reference voltage. The comparison results obtained by the two times of comparison of the first comparator 902 and the second comparator 904 are accurate, so that the control unit 708 can conveniently perform accurate processing according to the comparison results, the accuracy of the adjusting instruction output by the control unit 708 is high, and the control accuracy of the laser diode driving control circuit 104 is improved.
In one embodiment, the current drive module 208 is a digital to analog converter.
The current driving module 208 can generate a driving current according to the adjustment command and send the driving current to the laser diode 102. Specifically, the current driving module 208 may be a component or a circuit structure capable of autonomously generating a current, and outputting a driving current according to a regulation command. The current driving module 208 may also be a digital-to-analog converter, which is connected to the input signal, adjusts the current of the input signal according to the adjustment command based on the input signal, and outputs the driving current to the laser diode 102. Alternatively, the input signal to which the digital-to-analog converter is connected and the input signal to which the reference voltage conditioning module 204 is connected may be the same signal.
Further, in the physical characteristics of the laser diode 102, when the bias current of the laser diode 102 is changed, the average emitted light power of the laser diode 102 is correspondingly changed; when the modulation current of the laser diode 102 is changed, the extinction ratio of the laser diode 102 is correspondingly changed. Due to the characteristics of the laser diode 102, the bias current and the modulation current of the laser diode 102 need to be adjusted when the driving control of the laser diode 102 is performed. The current drive module 208 of the present application may include two digital-to-analog converters, one of which adjusts the bias current of the laser diode 102 and the other of which adjusts the modulation current of the laser diode 102.
In this embodiment, the current driving module 208 is a digital-to-analog converter, which has a simple structure and is convenient to install, and can improve the convenience of the laser diode driving control circuit 104 compared with other components or circuit structures that autonomously generate current.
In one embodiment, the laser monitoring module 202 includes a monitor photodiode.
The monitor photodiode may be the laser feedback diode PD in fig. 3, or any diode disposed around the laser emitting diode LD in fig. 3, and the monitor photodiode converts the received laser output of the laser emitting diode LD into a current signal by detecting the working state of the laser emitting diode LD. In this embodiment, the structure of using the monitor photodiode is simple, the arrangement is convenient, and the stability of the laser diode driving control circuit 104 can be improved.
In order to better understand the above, the laser diode driving control circuit 104 in this embodiment will be specifically described with reference to the circuit configuration shown in fig. 10.
In one embodiment, the laser diode drive control circuit 104 includes a laser monitor module 202, a reference voltage conditioning module 204, a current regulation module 206, and a current drive module 208, wherein the laser monitor module 202 is a monitor photodiode MPD (Monitoring Photo Diode), and the current drive module 208 is a digital-to-analog converter. The reference voltage conditioning module 204 includes a reference voltage analog unit 402, a first voltage conversion unit 404, and a first voltage output unit 406, where the first voltage output unit 406 includes a first peak detection circuit 602 and a first filter circuit 604, the reference voltage analog unit 402 is a feedforward equalization circuit, and the first voltage conversion unit 404 is a current-to-voltage conversion circuit. The current adjustment module 206 includes a second voltage conversion unit 702, a second voltage output unit 704, a voltage comparison unit 706, and a control unit 708, the second voltage output unit 704 includes a second peak detection circuit 802 and a second filter circuit 804, the voltage comparison unit 706 includes a first comparator 902 and a second comparator 904, the second voltage conversion unit 702 is a current-voltage conversion circuit, and the control unit 708 is a counter.
The digital-to-analog converter receives an input signal and outputs a driving current. The laser diode LD emits laser under the drive current of the digital-to-analog converter, the monitoring photodiode MPD receives the laser emitted by the laser diode LD, and outputs a corresponding current signal according to the received laser output parameters such as laser frequency and the like. The feedforward equalization circuit is connected to the same input signal as the digital-to-analog converter, and is used for simulating the process of converting the laser output parameters into current signals in the monitoring photodiode MPD, converting the input signals into reference signals and outputting reference currents. The first voltage conversion unit 404 is a current-voltage conversion circuit, and converts the reference current into an initial reference voltage and outputs the initial reference voltage to the first peak detection circuit 602 and the first filter circuit 604. The second voltage conversion unit 702 may be a current-voltage conversion circuit having the same structure as the first voltage conversion unit 404, converts a current signal into a voltage signal, outputs the voltage signal to the second peak detection circuit 802 and the second filter circuit 804, the second peak detection circuit 802 may have the same structure as the first peak detection circuit 602, and the second filter circuit 804 may have the same structure as the second filter circuit 804.
The positive electrode input end of the first comparator 902 is connected with the second peak detection circuit 802, and a peak value processed voltage signal output by the second peak detection circuit 802 is obtained; the negative input terminal of the first comparator 902 is connected to the first peak detection circuit 602, and obtains the initial reference voltage after the peak processing output by the first peak detection circuit 602. The first comparator 902 compares the voltage signal after the peak processing with the initial reference voltage after the peak processing, to obtain a first comparison result. The positive input end of the second comparator 904 is connected with the second filter circuit 804, and a filtered voltage signal output by the second filter circuit 804 is obtained; the negative input terminal of the second comparator 904 is connected to the first filter circuit 604, and obtains the filtered reference voltage output by the first filter circuit 604. The second comparator 904 compares the filtered voltage signal with the filtered reference voltage to obtain a second comparison result. The counter counts according to the first comparison result and the second comparison result, performs the action of increasing 1 or decreasing 1, and sends the counting condition in the counter as an adjusting instruction to the digital-to-analog converter. The number of the counters is two, and the corresponding digital-analog converters are also two and are respectively connected with the counters, and the two counters are respectively connected with the first comparator 902 and the second comparator 904. The driving current includes a bias current and a modulation current, one digital-to-analog converter outputs the bias current, and the other digital-to-analog converter outputs the modulation current. The extinction ratio is kept stable by controlling the modulation current of the laser diode LD, and the average optical power is kept stable by controlling the bias current of the laser diode LD.
In the present embodiment, the laser diode driving control circuit 104 is suitable for a dual-loop control structure of a continuous mode and burst mode high-speed laser driver. Unlike the conventional double closed loop structure, the present embodiment uses a feedforward equalization circuit to adjust an input signal, so that the input signal has a processing process similar to that of the analog monitor photodiode MPD, and then uses a peak detection circuit and a current-voltage conversion circuit with the same structure to perform sorting and outputting, so that the initial reference voltage (vref_peak in fig. 10) after peak processing and the voltage signal after peak processing received by the first comparator 902 have small relative errors; and the relative error between the filtered initial reference voltage (corresponding to vavg_tia_ref in fig. 10) and the filtered voltage signal received by the second comparator 906 is made small, so that the influence of the process deviation on the control precision can be reduced. A Feed-forward equalizer circuit (FFE, feed-Forward Equalization) is also used prior to the current-to-voltage converter circuit to generate a reference signal having a similar peak waveform and speed as the output waveform of the monitor photodiode MPD. The complete circuit for generating the whole reference voltage is composed of the feedforward equalization circuit, the first peak detection circuit 602, the first filter circuit 604 and the current-voltage conversion circuit, so that the influence of process deviation can be greatly reduced, and the reference voltage very similar to the processing path of the monitoring photodiode MPD is generated for double-loop control. The current error acquired by the current-voltage conversion circuit is smaller, the comparison output of the comparator in loop control is more accurate, and the error of the whole loop is smaller.
In the description of the present specification, reference to the term "some embodiments," "other embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (9)
1. A laser diode drive control circuit, comprising:
the laser monitoring module is used for monitoring the working state of the laser diode and outputting a corresponding current signal;
The reference voltage conditioning module comprises a reference voltage simulation unit, a first voltage conversion unit and a first voltage output unit, wherein the first voltage conversion unit is connected with the reference voltage simulation unit and the first voltage output unit, the reference voltage simulation unit is used for conditioning a reference signal and outputting a reference current, the first voltage conversion unit receives the reference current and outputs an initial reference voltage corresponding to the reference current, and the first voltage output unit is used for conditioning the initial reference voltage to obtain the reference voltage; the reference signal is a signal generated in the signal processing process of the simulation laser monitoring module;
The current regulation module comprises a second voltage conversion unit, a second voltage output unit, a voltage comparison unit and a control unit, wherein the second voltage conversion unit is connected with the laser monitoring module and the second voltage output unit, the second voltage output unit is connected with the voltage comparison unit, the voltage comparison unit is connected with the reference voltage regulation module and the control unit, the control unit is connected with the current driving module, the second voltage conversion unit is used for converting the current signal into a voltage signal, the second voltage output unit is used for regulating the voltage signal to obtain an output voltage, the voltage comparison unit is used for comparing the output voltage with the reference voltage and outputting a comparison result, and the control unit is used for generating a regulation instruction according to the comparison result and sending the regulation instruction to the current driving module;
and the current driving module generates driving current according to the adjusting instruction and transmits the driving current to the laser diode.
2. The laser diode driving control circuit according to claim 1, wherein the reference voltage analog unit is a feed-forward equalizing circuit.
3. The laser diode driving control circuit according to claim 1, wherein the first voltage conversion unit is a current-voltage conversion circuit.
4. The laser diode driving control circuit according to claim 1, wherein the first voltage output unit includes a first peak detection circuit and a first filter circuit, the first peak detection circuit connecting the first voltage conversion unit, the current adjustment module, and the first filter circuit, the first filter circuit connecting the first voltage conversion unit and the current adjustment module; the reference voltage comprises a filtered initial reference voltage and a peak value processed initial reference voltage; wherein,
The first filter circuit is connected with the initial reference voltage, filters the initial reference voltage to obtain the filtered initial reference voltage, and transmits the filtered initial reference voltage to the first peak value detection circuit and the current regulation module;
The first peak value detection circuit generates the initial reference voltage after peak value processing according to the accessed initial reference voltage and the filtered initial reference voltage, and outputs the initial reference voltage to the current regulation module.
5. The laser diode driving control circuit according to claim 1, wherein the second voltage output unit includes a second peak detection circuit and a second filter circuit, the second peak detection circuit being connected to the second voltage conversion unit, the voltage comparison unit, and the second filter circuit, the second filter circuit being connected to the second voltage conversion unit and the voltage comparison unit; the output voltage comprises a filtered voltage signal and a peak processed voltage signal; wherein,
The second filter circuit is connected with the voltage signal, filters the voltage signal to obtain the filtered voltage signal, and transmits the filtered voltage signal to the second peak value detection circuit and the voltage comparison unit;
The second peak detection circuit generates the peak processed voltage signal according to the accessed voltage signal and the filtered voltage signal and outputs the peak processed voltage signal to the voltage comparison unit.
6. The laser diode driving control circuit according to claim 5, wherein the voltage comparing unit includes a first comparator and a second comparator, a positive input end of the first comparator is connected to the second peak detecting circuit, a positive input end of the second comparator is connected to the second filtering circuit, a negative input end of the first comparator and a negative input end of the second comparator are both connected to the reference voltage conditioning module, and an output end of the first comparator and an output end of the second comparator are both connected to the control unit.
7. The laser diode driving control circuit of claim 6, wherein the control unit includes a first counter and a second counter, the first counter is connected to the first comparator, the second counter is connected to the second comparator, and the first counter and the second counter are both connected to the current driving module.
8. The laser diode driving control circuit of claim 1, wherein the current driving module is a digital-to-analog converter.
9. The laser diode drive control circuit of claim 1, wherein the laser monitoring module comprises a monitor photodiode.
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