CN111596713A - High-precision APC control circuit and method with quick response - Google Patents
High-precision APC control circuit and method with quick response Download PDFInfo
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- CN111596713A CN111596713A CN202010439824.4A CN202010439824A CN111596713A CN 111596713 A CN111596713 A CN 111596713A CN 202010439824 A CN202010439824 A CN 202010439824A CN 111596713 A CN111596713 A CN 111596713A
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- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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Abstract
The invention relates to a high-precision APC control circuit and method with quick response, which comprises the following steps: the DAC controller outputs an initial voltage to the laser, and the initial voltage is used as a target optical power signal and is arranged in the integral controller; the MPD feedback circuit converts the monitoring current of the laser into a monitoring voltage signal and sends the monitoring voltage signal to the integral controller; the integration controller receives a monitoring voltage signal sent by the MPD feedback circuit, compares the monitoring voltage signal with a target optical power signal, and judges whether the laser works in a locking state so as to adjust the voltage of the voltage-controlled current source; therefore, the working optical power of the laser is adjusted, so that the laser can work in a locking state and output stable optical power. The invention collects and monitors the working light power of the laser in real time, and if the working power of the laser is not equal to the ideal target light power, the working light power of the laser is adjusted in time, so that the aim that the laser can output stable light power is fulfilled.
Description
Technical Field
The invention relates to the technical field of APC control, in particular to a high-precision APC control circuit and method with quick response.
Background
When the laser outputs voltage, a circuit can cause signal distortion, the working optical power of the laser may be different from the power output by the output end, and therefore the working state of the laser needs to be detected and adjusted in real time, so that the working optical power of the laser can be the same as the power output by the output end, and the laser can work in a locking state to output stable optical power.
Disclosure of Invention
The invention aims to provide a scheme capable of detecting and adjusting the working optical power of a laser in real time, and provides a high-precision APC control circuit and method with quick response.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a high-precision APC control circuit with fast response enables a laser to output stable optical power, and comprises a DAC controller, an MPD feedback circuit, an integral controller and a voltage-controlled current source, wherein:
the DAC controller is used for outputting an initial voltage to the laser, and setting the initial voltage as a target optical power signal in the integral controller; the laser is paired with a PD light receiver and used for feeding back the monitoring current of the laser to an MPD feedback circuit;
the MPD feedback circuit is used for converting the monitoring current fed back by the PD light receiver into a monitoring voltage signal and sending the monitoring voltage signal to the integral controller;
the integral controller is used for receiving a monitoring voltage signal sent by the MPD feedback circuit, comparing the monitoring voltage signal with a target optical power signal set by the DAC controller, judging whether the working optical power of the laser reaches the target optical power or not, and adjusting the voltage of the voltage-controlled current source in order to enable the whole APC control circuit to work in a locking state;
and the voltage-controlled current source changes the current flowing through the laser according to the adjusting voltage of the integral controller, so that the working light power of the laser is adjusted, the laser can work in a locking state, and stable light power is output.
Furthermore, the integral controller comprises an operator U1, wherein the reverse input end of the operator U1 is connected with the initial voltage output by the DAC controller, and the forward input end of the operator U1 is connected with the monitoring voltage signal converted by the MPD feedback circuit; and the arithmetic unit U1 compares the monitoring voltage signal with a target optical power signal set by the DAC controller, and judges whether the laser works in a locking state or not, so that the voltage of the voltage-controlled current source is adjusted.
Furthermore, the voltage-controlled current source comprises a current-limiting resistor R1 and a MOSFET D1, wherein one end of the current-limiting resistor R1 is connected with the output end of the arithmetic unit U1, and the other end of the current-limiting resistor R1 is connected with the base of the MOSFET D1; the arithmetic unit U1 adjusts the base voltage of the MOSFET D1 through the current limiting resistor R1, so that the MOSFET D1 adjusts the voltage output to the laser, the working optical power of the laser is changed, and the laser can work in a locking state.
Furthermore, the MPD feedback circuit includes a transistor Q1, a transistor Q2, a transistor Q3, and a transistor Q4, an output end of the PD light receiver is connected to the transistor Q1 and the transistor Q2, the transistor Q2 is connected to the transistor Q3 and the transistor Q4, and an output end of the transistor Q4 is connected to a positive input end of the operator U1.
A high-precision APC control method with quick response comprises the following steps:
the DAC controller outputs an initial voltage to the laser;
the MPD feedback circuit feeds back a monitoring voltage signal of the laser to the integral controller;
the integral controller compares a target optical power signal set by the DAC controller with a monitoring voltage signal fed back by the MPD feedback circuit, and calculates an adjusting strategy for the voltage-controlled current source;
the voltage-controlled current source adjusts the working light power of the laser according to the adjustment strategy of the integral controller, so that the laser can work in a locking state, and stable light power is output.
Further, the step of outputting the initial voltage to the laser by the DAC controller includes:
the DAC controller outputs an initial voltage to the laser, and the initial voltage is used as a target optical power signal and is arranged in the integral controller;
the target optical power is the power which can enable the laser to work in a locking state.
Further, the step of feeding back the monitor voltage signal of the laser to the integrating controller by the MPD feedback circuit includes:
the PD light receiver matched with the laser feeds back the monitoring current of the laser to the MPD feedback circuit;
the MPD feedback circuit converts the monitoring current fed back by the PD light receiver into a monitoring voltage signal, and sends the monitoring voltage signal to the arithmetic unit U1 through a positive input end of the arithmetic unit U1.
Furthermore, the step of comparing, by the integral controller, the target optical power signal set by the DAC controller with the monitor voltage signal fed back by the MPD feedback circuit, and calculating the adjustment strategy for the voltage-controlled current source includes:
the arithmetic unit U1 compares a target optical power signal set by the DAC controller with a monitoring voltage signal fed back by MPD feedback voltage, and judges whether the laser works in a locking state; if the monitoring voltage signal fed back by the MPD feedback circuit is smaller than the target optical power signal, the arithmetic unit U1 increases the voltage output to the MOSFET D1, so that the base voltage of the MOSFET D1 is increased; if the monitor voltage signal fed back by the MPD feedback circuit is greater than the target optical power signal, the operator U1 decreases the voltage output to the MOSFET D1, so that the base voltage of the MOSFET D1 decreases.
Further, the step of adjusting the operating optical power of the laser by the voltage-controlled current source according to an adjustment strategy of the integral controller so that the laser can operate in a locked state to output a stable optical power includes:
if the base voltage of the MOSFET D1 is increased, the operating optical power of the laser is also increased, so that the laser can operate in a locked state, thereby outputting stable optical power; if the base voltage of the MOSFET D1 is decreased, the operating optical power of the laser is also decreased, so that the laser can operate in a locked state to output stable optical power.
The invention has the following beneficial effects:
the invention firstly uses DAC controller to output an initial voltage to the laser, the initial voltage is an ideal voltage which can make the laser work in locking state, and it is set in the integral controller as the target light power signal, but in the voltage transmission process, the line will cause signal distortion, the voltage which finally reaches the laser is possibly different from the initial voltage, therefore, MPD feedback circuit is used to convert the monitoring current of the laser induced by PD light receiver in real time into the monitoring voltage signal and send it to the integral controller, the integral controller compares the target light power with the monitoring voltage signal fed back by MPD feedback circuit, if the working voltage of the laser is different from the initial voltage, the integral controller regulates the voltage of the voltage-controlled current source, and then the voltage-controlled current source regulates the working light power of the laser, so that the laser can work in locking state, thereby outputting stable optical power and realizing APC control of the laser. The invention collects and monitors the working light power of the laser in real time, and if the working power of the laser is not equal to the ideal target light power, the working light power of the laser is adjusted in time, so that the aim that the laser can output stable light power is fulfilled.
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 an integrating controller, a voltage-controlled current source, and a laser circuit according to the present invention;
fig. 2 is a schematic diagram of an MPD feedback circuit according to the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
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. Also, in the description of the present invention, the terms "first", "second", and the like are used for distinguishing between descriptions and not necessarily for describing a relative importance or implying any actual relationship or order between such entities or operations.
Example 1:
the present invention is realized by the following technical solution, as shown in fig. 1, a fast-response high-precision APC control circuit, aiming to enable a laser to output stable optical power, including a DAC controller, an MPD feedback circuit, an integral controller, and a voltage-controlled current source, wherein:
the DAC controller is used for outputting an initial voltage to the laser and setting the initial voltage as a target optical power signal in the integrating controller.
The laser device is paired with a PD light receiver and used for feeding back monitoring current of the laser device to an MPD feedback circuit, the PD light receiver senses laser emitted by the laser device and converts the laser into working current of the laser device, and the working current of the laser device collected by the PD light receiver is called the monitoring current of the laser device.
As shown in fig. 2, the MPD feedback circuit includes a transistor Q1, a transistor Q2, a transistor Q3, and a transistor Q4, an output end of the PD light receiver is connected to the transistor Q1 and the transistor Q2, the transistor Q2 is connected to the transistor Q3 and the transistor Q4, and an output end of the transistor Q4 is connected to an input end of the integral controller. The MPD feedback circuit is connected with the monitoring current of the laser fed back by the PD light receiver, and feeds the monitoring current back to the integral controller after converting the monitoring current into a monitoring voltage signal.
The integral controller comprises an operator U1, the reverse input end of the operator U1 is connected with the initial voltage output by the DAC controller, and the forward input end of the operator U1 is connected with the monitoring voltage signal converted by the MPD feedback circuit; the arithmetic unit U1 compares the monitoring voltage signal with the target optical power signal set by the DAC controller, determines whether the working optical power of the laser reaches the target optical power, and adjusts the voltage of the voltage-controlled current source in order to make the entire APC control circuit operate in a locked state.
The voltage-controlled current source comprises a current-limiting resistor R1 and a MOSFET (metal oxide semiconductor field effect transistor) tube D1, wherein one end of the current-limiting resistor R1 is connected with the output end of the arithmetic unit U1, and the other end of the current-limiting resistor R1 is connected with the base electrode of the MOSFET tube D1; the arithmetic unit U1 adjusts the base voltage of the MOSFET D1 through the current-limiting resistor R1, and changes the current flowing through the MOSFET D1, so that the MOSFET D1 adjusts the voltage output to the laser, changes the current flowing through the laser, changes the working optical power of the laser, enables the laser to work in a locked state, and outputs stable optical power.
In summary, the present invention first uses the DAC controller to output an initial voltage to the laser, where the initial voltage is an ideal voltage that can make the laser operate in a locked state, and the initial voltage is set in the integral controller as a target optical power signal, but during the voltage transmission process, a line may cause signal distortion, and the voltage that finally reaches the laser may be different from the initial voltage, so that the MPD feedback circuit is used to convert the monitoring current of the laser sensed by the PD light receiver in real time into a monitoring voltage signal and then send the monitoring voltage signal to the integral controller, the integral controller compares the target optical power with the monitoring voltage signal fed back by the MPD feedback circuit, and if the operating voltage of the laser is different from the initial voltage, the integral controller regulates the voltage of the voltage-controlled current source, and then the voltage-controlled current source regulates the operating optical power of the laser, so that the laser can operate in the locked state, thereby outputting stable optical power and realizing APC control of the laser.
Based on the APC control circuit, the invention also provides a high-precision APC control method with quick response, which comprises the following steps:
step S1: the DAC controller outputs an initial voltage to the laser.
And the DAC controller outputs an initial voltage to the laser, and the initial voltage is used as a target optical power signal and arranged in the integral controller for being compared with a monitoring voltage signal of the laser fed back by the MPD feedback circuit. The target optical power is the power which can enable the laser to work in a locking state.
Step S2: the MPD feedback circuit feeds back a monitoring voltage signal of the laser to the integral controller.
The PD light receiver matched with the laser feeds back the monitoring current of the laser to the MPD feedback circuit; the MPD feedback circuit converts the monitoring current fed back by the PD light receiver into a monitoring voltage signal, and sends the monitoring voltage signal to the arithmetic unit U1 through a positive input end of the arithmetic unit U1.
Step S3: and the integral controller compares a target optical power signal set by the DAC controller with a monitoring voltage signal fed back by the MPD feedback circuit, and calculates an adjusting strategy for the voltage-controlled current source.
And the arithmetic unit U1 compares a target optical power signal set by the DAC controller with a monitoring voltage signal fed back by the MPD feedback voltage, and judges whether the laser works in a locking state. When the monitoring voltage signal fed back by the MPD feedback circuit is different from the target optical power signal, the laser does not work in a locking state.
If the monitoring voltage signal fed back by the MPD feedback circuit is smaller than the target optical power signal, the arithmetic unit U1 increases the voltage output to the MOSFET D1, so that the base voltage of the MOSFET D1 is increased, and the current flowing through the MOSFET D1 is increased; if the monitor voltage signal fed back by the MPD feedback circuit is greater than the target optical power signal, the operator U1 decreases the voltage output to the MOSFET D1, so that the base voltage of the MOSFET D1 is decreased, thereby decreasing the current flowing through the MOSFET D1.
Step S4: the voltage-controlled current source adjusts the working light power of the laser according to the adjustment strategy of the integral controller, so that the laser can work in a locking state, and stable light power is output.
If the base voltage of the MOSFET D1 is increased, the operating optical power output from the MOSFET D1 to the laser is also increased, so that the laser can operate in a locked state, thereby outputting a stable optical power; if the base voltage of the MOSFET D1 is decreased, the operating optical power outputted from the MOSFET D1 to the laser is also decreased, so that the laser can operate in a locked state to output a stable optical power.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A fast-response high-precision APC control circuit for making a laser output a stable optical power, characterized in that: the device comprises a DAC controller, an MPD feedback circuit, an integral controller and a voltage-controlled current source, wherein:
the DAC controller is used for outputting an initial voltage to the laser, and setting the initial voltage as a target optical power signal in the integral controller; the laser is paired with a PD light receiver and used for feeding back the monitoring current of the laser to an MPD feedback circuit;
the MPD feedback circuit is used for converting the monitoring current fed back by the PD light receiver into a monitoring voltage signal and sending the monitoring voltage signal to the integral controller;
the integral controller is used for receiving a monitoring voltage signal sent by the MPD feedback circuit, comparing the monitoring voltage signal with a target optical power signal set by the DAC controller, judging whether the working optical power of the laser reaches the target optical power or not, and adjusting the voltage of the voltage-controlled current source in order to enable the whole APC control circuit to work in a locking state;
and the voltage-controlled current source changes the current flowing through the laser according to the adjusting voltage of the integral controller, so that the working light power of the laser is adjusted, the laser can work in a locking state, and stable light power is output.
2. The fast-response high-precision APC control circuit according to claim 1, wherein: the integral controller comprises an operator U1, the reverse input end of the operator U1 is connected with the initial voltage output by the DAC controller, and the forward input end of the operator U1 is connected with the monitoring voltage signal converted by the MPD feedback circuit; and the arithmetic unit U1 compares the monitoring voltage signal with a target optical power signal set by the DAC controller, and judges whether the laser works in a locking state or not, so that the voltage of the voltage-controlled current source is adjusted.
3. The fast-response high-precision APC control circuit according to claim 2, wherein: the voltage-controlled current source comprises a current-limiting resistor R1 and a MOSFET (metal oxide semiconductor field effect transistor) tube D1, one end of the current-limiting resistor R1 is connected with the output end of the arithmetic unit U1, and the other end of the current-limiting resistor R1 is connected with the base electrode of the MOSFET tube D1;
the arithmetic unit U1 adjusts the base voltage of the MOSFET D1 through the current limiting resistor R1, so that the MOSFET D1 adjusts the voltage output to the laser, the working optical power of the laser is changed, and the laser can work in a locking state.
4. The fast-response high-precision APC control circuit according to claim 3, wherein: the MPD feedback circuit comprises a triode Q1, a triode Q2, a triode Q3 and a triode Q4, the output end of the PD light receiver is respectively connected with the triode Q1 and the triode Q2, the triode Q2 is respectively connected with the triode Q3 and the triode Q4, and the output end of the triode Q4 is connected with the positive input end of the arithmetic unit U1.
5. A high-precision APC control method with quick response is characterized in that: the method comprises the following steps:
the DAC controller outputs an initial voltage to the laser;
the MPD feedback circuit feeds back a monitoring voltage signal of the laser to the integral controller;
the integral controller compares a target optical power signal set by the DAC controller with a monitoring voltage signal fed back by the MPD feedback circuit, and calculates an adjusting strategy for the voltage-controlled current source;
the voltage-controlled current source adjusts the working light power of the laser according to the adjustment strategy of the integral controller, so that the laser can work in a locking state, and stable light power is output.
6. The fast-response high-precision APC control method according to claim 5, characterized in that: the step of outputting an initial voltage to the laser by the DAC controller comprises:
the DAC controller outputs an initial voltage to the laser, and the initial voltage is used as a target optical power signal and is arranged in the integral controller;
the target optical power is the power which can enable the laser to work in a locking state.
7. The fast-response high-precision APC control method according to claim 6, characterized in that: the step of feeding back the monitoring voltage signal of the laser to the integral controller by the MPD feedback circuit comprises the following steps:
the PD light receiver matched with the laser feeds back the monitoring current of the laser to the MPD feedback circuit;
the MPD feedback circuit converts the monitoring current fed back by the PD light receiver into a monitoring voltage signal, and sends the monitoring voltage signal to the arithmetic unit U1 through a positive input end of the arithmetic unit U1.
8. The fast-response high-precision APC control method according to claim 7, characterized in that: the integration controller compares a target optical power signal set by the DAC controller with a monitoring voltage signal fed back by the MPD feedback circuit, and calculates an adjustment strategy for the voltage-controlled current source, and the method comprises the following steps:
the arithmetic unit U1 compares a target optical power signal set by the DAC controller with a monitoring voltage signal fed back by MPD feedback voltage, and judges whether the laser works in a locking state;
if the monitoring voltage signal fed back by the MPD feedback circuit is smaller than the target optical power signal, the arithmetic unit U1 increases the voltage output to the MOSFET D1, so that the base voltage of the MOSFET D1 is increased;
if the monitor voltage signal fed back by the MPD feedback circuit is greater than the target optical power signal, the operator U1 decreases the voltage output to the MOSFET D1, so that the base voltage of the MOSFET D1 decreases.
9. The fast-response high-precision APC control method according to claim 8, characterized in that: the voltage-controlled current source adjusts the working optical power of the laser according to the adjustment strategy of the integral controller, so that the laser can work in a locking state, and stable optical power is output, and the method comprises the following steps:
if the base voltage of the MOSFET D1 is increased, the operating optical power of the laser is also increased, so that the laser can operate in a locked state, thereby outputting stable optical power;
if the base voltage of the MOSFET D1 is decreased, the operating optical power of the laser is also decreased, so that the laser can operate in a locked state to output stable optical power.
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| CN1419722A (en) * | 2000-02-04 | 2003-05-21 | 斯特拉托斯光波公司 | Automatic power control and laser sloep efficiency normalizing circuit |
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Application publication date: 20200828 |