CN113437638B - VCSEL laser temperature control method and device - Google Patents
VCSEL laser temperature control method and device Download PDFInfo
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- H—ELECTRICITY
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- 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
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- H01S5/02—Structural details or components not essential to laser action
- H01S5/024—Arrangements for thermal management
- H01S5/02407—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling
- H01S5/02415—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling by using a thermo-electric cooler [TEC], e.g. Peltier element
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- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
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Abstract
The invention provides a VCSEL laser temperature control method and VCSEL laser temperature control equipment. The method comprises the following steps: connecting the thermistor and the digital potentiometer with a fully differential instrument amplifying circuit respectively, inputting a temperature differential signal into an analog-to-digital converter and initializing a circuit; setting the resistance value of a digital potentiometer according to the target working temperature of the VCSEL laser, setting a register value according to the output current of the integrated numerical control constant current source, and controlling the thermistor and the digital potentiometer by the integrated numerical control constant current source; the thermistor and the digital potentiometer form a bridge circuit, the bridge circuit is adopted to obtain a temperature error digital signal, and a control step length and a control quantity are determined according to the temperature error digital signal; and controlling the integrated numerical control constant current source to output a first current to drive the semiconductor refrigerator to control the temperature according to the control step length and the control quantity. The invention can effectively simplify the circuit complexity, improve the temperature sampling resolution, widen the temperature adjusting range and enhance the stability of laser wavelength.
Description
Technical Field
The embodiment of the invention relates to the technical field of laser control, in particular to a VCSEL temperature control method and VCSEL temperature control equipment.
Background
The VCSEL laser (vertical cavity surface emitting laser) is widely applied to the fields of optical communication, atomic clocks, optical storage, laser radars, precision measurement and the like, and the performance of the VCSEL laser as a light source directly influences the performance index of a system where the VCSEL laser is located. The VCSEL laser used in the fields of precision measurement and the like has higher requirements on wavelength and frequency precision, and the wavelength of output laser and working current have a linear relation, thereby belonging to variables which are easy to control. However, the VCSEL laser frequency is sensitive to temperature, and it is necessary to keep the temperature of the VCSEL laser highly stable, and in order to improve the long-term stability and short-term stability of the precision measurement system, the temperature adjustment precision of the VCSEL laser must be ensured. Therefore, a method and an apparatus for controlling the temperature of a VCSEL laser are developed to effectively overcome the above-mentioned drawbacks in the related art, and thus a technical problem to be solved is needed in the art.
Disclosure of Invention
In view of the above problems in the prior art, embodiments of the present invention provide a method and an apparatus for controlling a temperature of a VCSEL laser.
In a first aspect, an embodiment of the present invention provides a VCSEL laser temperature control method, including: connecting the thermistor and the digital potentiometer with a fully differential instrument amplifying circuit respectively, inputting a temperature differential signal into an analog-to-digital converter and initializing a circuit; setting the resistance value of a digital potentiometer according to the target working temperature of the VCSEL laser, setting a register value according to the output current of the integrated numerical control constant current source, and controlling the thermistor and the digital potentiometer by the integrated numerical control constant current source; the thermistor and the digital potentiometer form a bridge circuit, the bridge circuit is adopted to obtain a temperature error digital signal, and a control step length and a control quantity are determined according to the temperature error digital signal; and controlling the integrated numerical control constant current source to output a first current to drive the semiconductor refrigerator to control the temperature according to the control step length and the control quantity.
On the basis of the content of the above method embodiment, the method for controlling the temperature of the VCSEL laser provided in the embodiment of the present invention further includes, after the controlling the integrated digitally controlled constant current source to output the first current to drive the semiconductor refrigerator for temperature control, the following steps: and if the working temperature range of the VCSEL laser is changed, changing the value of the working temperature of the VCSEL laser by changing the resistance value of the digital potentiometer and adjusting the third current output by the integrated numerical control constant current source.
On the basis of the content of the above method embodiment, the method for controlling the temperature of the VCSEL laser provided in the embodiment of the present invention, in which the thermistor and the digital potentiometer are respectively connected to the fully differential instrument amplification circuit, includes: connecting the thermistor and the digital potentiometer with a second resistor and a third resistor of the fully differential instrument amplifying circuit respectively; the resistance of the digital potentiometer is a first resistance.
On the basis of the content of the embodiment of the method, the method for controlling the temperature of the VCSEL laser, which is provided by the embodiment of the invention, adopts the integrated numerical control constant current source to control the thermistor, and comprises the following steps: and driving the thermistor by adopting a second current output by the integrated numerical control constant current source.
On the basis of the content of the embodiment of the method, the method for controlling the temperature of the VCSEL laser, which is provided by the embodiment of the invention, adopts the integrated numerical control constant current source to control the digital potentiometer, and comprises the following steps: and a third current output by the integrated numerical control constant current source is adopted to drive the digital potentiometer.
On the basis of the content of the above method embodiment, the VCSEL laser temperature control method provided in the embodiment of the present invention, where the obtaining of the temperature error digital signal by using the bridge circuit, includes: the temperature error is converted into an error voltage signal by a bridge circuit, and the error voltage signal is converted into a temperature error digital signal by an analog-to-digital converter.
In a second aspect, an embodiment of the present invention provides a VCSEL laser temperature control system, including: the temperature sensing module is used for collecting a temperature signal of the VCSEL laser; the signal conditioning module is used for improving the signal-to-noise ratio of the collected temperature signal of the VCSEL laser and inhibiting the common-mode noise of the temperature signal of the VCSEL laser; the analog-to-digital conversion module is used for converting the error voltage signal into a temperature error digital signal; a VCSEL laser for generating a temperature signal; the main control module is used for receiving the temperature error digital signal and determining a control step length and a control quantity; and the integrated numerical control constant current source is used for driving the thermistor, the digital potentiometer and the semiconductor refrigerator.
In a third aspect, an embodiment of the present invention provides a VCSEL laser temperature control apparatus, including: the first main module is used for respectively connecting the thermistor and the digital potentiometer with the fully differential instrument amplifying circuit, inputting the temperature differential signal into the analog-to-digital converter and initializing the circuit; the second main module is used for setting the resistance value of the digital potentiometer according to the target working temperature of the VCSEL laser, setting the register value according to the output current of the integrated numerical control constant current source, and controlling the thermistor and the digital potentiometer by the integrated numerical control constant current source; the third main module is used for forming a bridge circuit by the thermistor and the digital potentiometer, obtaining a temperature error digital signal by adopting the bridge circuit, and determining a control step length and a control quantity according to the temperature error digital signal; and the fourth main module is used for controlling the integrated numerical control constant current source to output a first current to drive the semiconductor refrigerator to control the temperature according to the control step length and the control quantity.
In a fourth aspect, an embodiment of the present invention provides an electronic device, including:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the VCSEL laser temperature control method provided in any of the various implementations of the first aspect.
In a fifth aspect, embodiments of the present invention provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the VCSEL laser temperature control method provided in any of the various implementations of the first aspect.
According to the VCSEL temperature control method and device provided by the embodiment of the invention, the resistance value of the digital potentiometer is set, the thermistor and the digital potentiometer are controlled by the integrated numerical control constant current source, the thermistor and the digital potentiometer form a bridge circuit, the bridge circuit is adopted to obtain a temperature error digital signal, a control step length and a control quantity are determined according to the temperature error digital signal, and the semiconductor refrigerator is controlled according to the control step length and the control quantity to realize the temperature control of the VCSEL laser, so that the circuit complexity can be effectively simplified, the temperature sampling resolution is improved, the temperature regulation range is widened, and the stability of laser wavelength is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below to the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a VCSEL laser temperature control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a VCSEL laser temperature control apparatus according to an embodiment of the present invention;
fig. 3 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a VCSEL laser temperature control system according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a VCSEL laser temperature control system according to an embodiment of the present invention.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, technical features of various embodiments or individual embodiments provided by the present invention may be arbitrarily combined with each other to form a feasible technical solution, and such combination is not limited by the sequence of steps and/or the structural composition mode, but must be realized by a person skilled in the art, and when the technical solution combination is contradictory or cannot be realized, such a technical solution combination should not be considered to exist and is not within the protection scope of the present invention.
The invention adopts a high-precision numerical control constant current source to drive a temperature measuring bridge consisting of an NTC and a digital potentiometer, improves the temperature sampling resolution, can conveniently set the working temperature by the digital potentiometer, uses a fully differential instrument amplifier to suppress common mode noise, and uses a high-precision ADC based on the combination of simulation and digit. Based on this idea, an embodiment of the present invention provides a VCSEL laser temperature control method, which includes, with reference to fig. 1: connecting the thermistor and the digital potentiometer with a fully differential instrument amplifying circuit respectively, inputting a temperature differential signal into an analog-to-digital converter and initializing a circuit; setting the resistance value of a digital potentiometer according to the target working temperature of the VCSEL laser, setting a register value according to the output current of the integrated numerical control constant current source, and controlling the thermistor and the digital potentiometer by the integrated numerical control constant current source; the thermistor and the digital potentiometer form a bridge circuit, the bridge circuit is adopted to obtain a temperature error digital signal, and a control step length and a control quantity are determined according to the temperature error digital signal; and controlling the integrated numerical control constant current source to output a first current to drive the semiconductor refrigerator to control the temperature according to the control step length and the control quantity.
Based on the content of the foregoing method embodiment, as an optional embodiment, the method for controlling a temperature of a VCSEL laser provided in the embodiment of the present invention further includes, after the controlling the integrated digitally controlled constant current source to output the first current to drive the semiconductor refrigerator for temperature control, that: and if the working temperature range of the VCSEL laser is changed, changing the value of the working temperature of the VCSEL laser by changing the resistance value of the digital potentiometer and adjusting the third current output by the integrated numerical control constant current source. Specifically, when the VCSEL working temperature needs to be changed in a large range (such as from 40 ℃ to 70 ℃), the magnitude of the temperature set point is accurately changed by changing the resistance value of the digital potentiometer and finely adjusting the value of the third current I3 output by the integrated numerical control constant current source.
Based on the content of the foregoing method embodiment, as an optional embodiment, the method for controlling a temperature of a VCSEL laser provided in the embodiment of the present invention, where the thermistor and the digital potentiometer are respectively connected to an amplifying circuit of a fully differential instrument, includes: connecting the thermistor and the digital potentiometer with a second resistor and a third resistor of the fully differential instrument amplifying circuit respectively; the resistance of the digital potentiometer is a first resistance. Specifically, an NTC thermistor packaged inside a laser and a digital potentiometer R1 providing temperature reference are respectively connected with a second resistor R2 and a third resistor R3 of a fully differential instrument amplifying circuit, the fully differential instrument amplifying circuit (namely a signal conditioning module) inputs a temperature differential signal into a precise non-aliasing ADC (namely an analog-to-digital conversion module), and circuit initialization is started.
Based on the content of the foregoing method embodiment, as an optional embodiment, the method for controlling the temperature of the VCSEL laser provided in the embodiment of the present invention, in which the thermistor is controlled by using the integrated digitally controlled constant current source, includes: and driving the thermistor by adopting a second current output by the integrated numerical control constant current source.
Based on the content of the foregoing method embodiment, as an optional embodiment, the method for controlling a temperature of a VCSEL laser provided in the embodiment of the present invention, in which the digital potentiometer is controlled by using an integrated digitally-controlled constant current source, includes: and a third current output by the integrated numerical control constant current source is adopted to drive the digital potentiometer.
Based on the content of the foregoing method embodiment, as an optional embodiment, the method for controlling the temperature of the VCSEL laser provided in the embodiment of the present invention, where the obtaining of the temperature error digital signal by using the bridge circuit includes: the temperature error is converted into an error voltage signal by a bridge circuit, and the error voltage signal is converted into a temperature error digital signal by an analog-to-digital converter.
Specifically, the main control module sets the resistance value of the digital potentiometer through IO10 according to the target working temperature of the VCSEL laser, and writes the output current setting register value of the integrated numerical control constant current source into the main control module through the SPI interface; waiting for the ambient temperature to reach a steady state in an initial state; the integrated numerical control constant current source outputs a second current I2 to drive the NTC thermistor, the integrated numerical control constant current source outputs a third current I3 to drive the digital potentiometer R1, and the driving current does not exceed 2mA in consideration of the heat effect of the resistor; a simplified bridge circuit is formed by a thermistor (temperature coefficient is a negative value) and a digital potentiometer, a temperature error is converted into an error voltage signal through a bridge, and the temperature error digital signal is acquired by a main control module through an SPI (serial peripheral interface) of a precise non-aliasing ADC (analog-to-digital conversion) module. Controlling the integrated numerical control constant current source to output a first current I1 to drive a TEC (semiconductor cooler) to control the temperature through an SPI (serial peripheral interface) of the integrated numerical control constant current source; the time-frequency precision measurement system generally comprises two temperature control circuits, namely a VCSEL laser temperature control circuit and a time-frequency precision measurement physical system temperature control circuit, the VCSEL laser is placed inside the time-frequency precision measurement physical system, and the working temperature of the time-frequency precision measurement physical system is higher than that of the VCSEL laser, so that the built-in TEC of the VCSEL laser is adopted to perform unidirectional refrigeration temperature control on the VCSEL laser tube, the design of the physical system and the temperature control circuit is simplified, and the circuit volume and the power consumption are reduced.
According to the VCSEL temperature control method provided by the embodiment of the invention, the resistance value of the digital potentiometer is set, the thermistor and the digital potentiometer are controlled by the integrated numerical control constant current source, the thermistor and the digital potentiometer form a bridge circuit, the bridge circuit is adopted to obtain a temperature error digital signal, a control step length and a control quantity are determined according to the temperature error digital signal, and the semiconductor refrigerator is controlled according to the control step length and the control quantity to realize the temperature control of the VCSEL laser, so that the circuit complexity can be effectively simplified, the temperature sampling resolution is improved, the temperature regulation range is widened, and the stability of laser wavelength is enhanced.
An embodiment of the present invention provides a VCSEL laser temperature control system, and referring to fig. 4, the VCSEL laser temperature control system includes: the temperature sensing module is used for collecting a temperature signal of the VCSEL laser; the signal conditioning module is used for improving the signal-to-noise ratio of the collected temperature signal of the VCSEL laser and inhibiting the common-mode noise of the temperature signal of the VCSEL laser; the analog-to-digital conversion module is used for converting the error voltage signal into a temperature error digital signal; a VCSEL laser for generating a temperature signal; the main control module is used for receiving the temperature error digital signal and determining a control step length and a control quantity; and the integrated numerical control constant current source is used for driving the thermistor, the digital potentiometer and the semiconductor refrigerator. The digital potentiometer is used for setting the working temperature of the VCSEL laser and forms a bridge circuit together with the thermistor.
The specific circuit composition of the VCSEL laser temperature control system can be seen in FIG. 5, the integrated numerical control constant current source is composed of a power supply input port, a serial SPI interface and a three-channel constant current source, a 1 st pin of the integrated numerical control constant current source is connected with a 5V power supply, a 2 nd pin is connected with a signal ground, a 3 rd pin is used as a constant current source channel 1 output out1 and is connected with a 1 st pin of a laser, a 4 th pin of the integrated numerical control constant current source is connected with a 3 th pin of the laser, a 5 th pin of the integrated numerical control constant current source is connected with a 1 pin of a digital potentiometer, a 6 th pin of the integrated numerical control constant current source is connected with a master control chip IO1, a 7 th pin of the integrated numerical control constant current source is connected with a master control chip IO2, an 8 th pin of the integrated numerical control constant current source SCK is connected with a master control chip IO3, and a 9 th pin of the integrated numerical control constant current source CS is connected with a master control chip 4. The laser consists of a TEC semiconductor refrigerator and an NTC thermistor, wherein the 1 st pin of the laser (VCSEL) is connected with the 3 rd pin of the integrated numerical control constant current source and receives current I1, the 3 rd pin of the laser is connected with the 4 th pin of the integrated numerical control constant current source and receives current I2, the 2 nd pin of the laser is grounded, and the 4 th pin of the laser is grounded. The 1 st pin of the digital potentiometer R1 is connected with the 3 rd resistor R3, the other pin of the 3 rd resistor R3 is connected with the non-inverting input end of the fully differential instrument amplifier, the 3 rd pin of the digital potentiometer is connected with the main control chip IO10, and the 2 nd pin of the digital potentiometer is grounded. The fully differential instrument amplifying circuit comprises a fully differential instrument amplifier IA, a 2 nd resistor R2, a 3 rd resistor R3, a 4 th resistor R4, a 5 th resistor R5, a 6 th resistor R6, a 7 th resistor R7, a 1 st capacitor C1, a 2 nd capacitor C2 and a 3 rd capacitor C3; the inverting input end of the fully differential instrument amplifier IA is connected with the common end of a 2 nd resistor R2 and a 4 th resistor R4, the non-inverting input end of the fully differential instrument amplifier IA is connected with the common end of a 3 rd resistor R3 and a 6 th resistor R6, the other end of the 4 th resistor R4 is connected with a 5 th resistor R5, the other end of the 6 th resistor R6 is connected with a 7 th resistor R7, the other end of the 5 th resistor R5 is connected with the common end of a 1 st capacitor C1 and a 2 nd capacitor C2, the common end of the 1 st capacitor C1 and the 2 nd capacitor C2 is further connected with Ain + of the precision aliasing-free ADC, the other end of the 7 th resistor R7 is connected with the common end of a 2 nd capacitor C2 and a 3 rd capacitor C3, the common end of the 2 nd capacitor C2 and the 3 rd capacitor C3 is further connected with an Ain-pin of the precision aliasing-free ADC, the other end of the 3 rd capacitor C3 is grounded, and the other end of the 1 st capacitor C1 is connected with ground; the analog-to-digital conversion module (in another embodiment, may be a precision aliasing-free ADC) mainly includes an analog-to-digital demodulation and serial SPI interface, a 1 st pin of the analog-to-digital conversion module is connected to a common terminal of a 5 th resistor R5 and a 1 st capacitor C1, a 2 nd pin of the analog-to-digital conversion module is connected to a common terminal of a 7 th resistor R7 and a 3 rd capacitor C3, a 3 rd pin of the analog-to-digital conversion module is connected to DIN and a main control chip IO9, a 4 th pin of the analog-to-digital conversion module is connected to DOUT and a main control chip IO8, a 5 th pin of the analog-to-digital conversion module is connected to SCLK and a main control chip IO7, a 6 th pin of the analog-to-digital conversion module is connected to DRDY and a 7 th pin of the analog-to-digital conversion module is connected to CS and a serial SPI interface 5.
The implementation basis of the various embodiments of the present invention is realized by programmed processing performed by a device having a processor function. Therefore, in engineering practice, the technical solutions and functions thereof of the embodiments of the present invention can be packaged into various modules. Based on this reality, on the basis of the embodiments described above, embodiments of the present invention provide a VCSEL laser temperature control apparatus for performing the VCSEL laser temperature control method in the above method embodiments. Referring to fig. 2, the apparatus includes: the first main module is used for respectively connecting the thermistor and the digital potentiometer with the fully differential instrument amplifying circuit, inputting the temperature differential signal into the analog-to-digital converter and initializing the circuit; the second main module is used for setting the resistance value of the digital potentiometer according to the target working temperature of the VCSEL laser, setting the register value according to the output current of the integrated numerical control constant current source, and controlling the thermistor and the digital potentiometer by the integrated numerical control constant current source; the third main module is used for forming a bridge circuit by the thermistor and the digital potentiometer, obtaining a temperature error digital signal by adopting the bridge circuit, and determining a control step length and a control quantity according to the temperature error digital signal; and the fourth main module is used for controlling the integrated numerical control constant current source to output a first current to drive the semiconductor refrigerator to control the temperature according to the control step length and the control quantity.
The VCSEL laser temperature control device provided by the embodiment of the invention adopts a plurality of modules in FIG. 2, sets the resistance value of a digital potentiometer, adopts an integrated numerical control constant current source to control a thermistor and the digital potentiometer, the thermistor and the digital potentiometer form a bridge circuit, adopts the bridge circuit to obtain a temperature error digital signal, determines a control step length and a control quantity according to the temperature error digital signal, controls a semiconductor refrigerator according to the control step length and the control quantity to realize temperature control of the VCSEL laser, can effectively simplify the circuit complexity, improve the temperature sampling resolution ratio, widen the temperature regulation range and enhance the stability of laser wavelength.
It should be noted that, the apparatus in the apparatus embodiment provided by the present invention may be used for implementing methods in other method embodiments provided by the present invention, except that corresponding function modules are provided, and the principle of the apparatus embodiment provided by the present invention is basically the same as that of the apparatus embodiment provided by the present invention, so long as a person skilled in the art obtains corresponding technical means by combining technical features on the basis of the apparatus embodiment described above, and obtains a technical solution formed by these technical means, on the premise of ensuring that the technical solution has practicability, the apparatus in the apparatus embodiment described above may be modified, so as to obtain a corresponding apparatus class embodiment, which is used for implementing methods in other method class embodiments. For example:
based on the content of the above device embodiment, as an optional embodiment, the VCSEL laser temperature control device provided in the embodiment of the present invention further includes: the first submodule is used for realizing that after the integrated numerical control constant current source is controlled to output a first current to drive the semiconductor refrigerator to carry out temperature control, the method also comprises the following steps: and if the working temperature range of the VCSEL laser is changed, changing the value of the working temperature of the VCSEL laser by changing the resistance value of the digital potentiometer and adjusting the third current output by the integrated numerical control constant current source.
Based on the content of the above device embodiment, as an optional embodiment, the VCSEL laser temperature control device provided in the embodiment of the present invention further includes: the second submodule is used for respectively connecting the thermistor and the digital potentiometer with the fully differential instrument amplifying circuit, and comprises: connecting the thermistor and the digital potentiometer with a second resistor and a third resistor of the fully differential instrument amplifying circuit respectively; the resistance of the digital potentiometer is a first resistance.
Based on the content of the above device embodiment, as an optional embodiment, the VCSEL laser temperature control device provided in the embodiment of the present invention further includes: the third submodule is used for realizing that the thermistor is controlled by the integrated numerical control constant current source, and comprises: and driving the thermistor by adopting a second current output by the integrated numerical control constant current source.
Based on the content of the above device embodiment, as an optional embodiment, the VCSEL laser temperature control device provided in the embodiment of the present invention further includes: the fourth submodule is used for realizing that the integrated numerical control constant current source is adopted to control the digital potentiometer, and comprises: and a third current output by the integrated numerical control constant current source is adopted to drive the digital potentiometer.
Based on the content of the above device embodiment, as an optional embodiment, the VCSEL laser temperature control device provided in the embodiment of the present invention further includes: a fifth sub-module, configured to implement that the temperature error digital signal is obtained by using a bridge circuit, including: the temperature error is converted into an error voltage signal by a bridge circuit, and the error voltage signal is converted into a temperature error digital signal by an analog-to-digital converter.
The method of the embodiment of the invention is realized by depending on the electronic equipment, so that the related electronic equipment is necessarily introduced. To this end, an embodiment of the present invention provides an electronic apparatus, as shown in fig. 3, including: the system comprises at least one processor (processor), a communication Interface (communication Interface), at least one memory (memory) and a communication bus, wherein the at least one processor, the communication Interface and the at least one memory are communicated with each other through the communication bus. The at least one processor may invoke logic instructions in the at least one memory to perform all or a portion of the steps of the methods provided by the various method embodiments described above.
In addition, the logic instructions in the at least one memory may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the method embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. Based on this recognition, each block in the flowchart or block diagrams may represent a module, a program segment, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In this patent, 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 … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for temperature control of a VCSEL laser, comprising: connecting the thermistor and the digital potentiometer with a fully differential instrument amplifying circuit respectively, inputting a temperature differential signal into an analog-to-digital converter and initializing a circuit; setting the resistance value of a digital potentiometer according to the target working temperature of the VCSEL laser, setting a register value according to the output current of the integrated numerical control constant current source, and controlling the thermistor and the digital potentiometer by the integrated numerical control constant current source; the thermistor and the digital potentiometer form a bridge circuit, the bridge circuit is adopted to obtain a temperature error digital signal, and a control step length and a control quantity are determined according to the temperature error digital signal; controlling the integrated numerical control constant current source to output a first current to drive the semiconductor refrigerator to control the temperature according to the control step length and the control quantity; the integrated numerical control constant current source consists of a power supply input, a serial SPI interface and a three-channel constant current source.
2. The method of claim 1, wherein after the controlling the integrated digitally controlled constant current source to output the first current driven semiconductor refrigerator for temperature control, the method further comprises: and if the working temperature range of the VCSEL laser is changed, changing the value of the working temperature of the VCSEL laser by changing the resistance value of the digital potentiometer and adjusting the third current output by the integrated numerical control constant current source.
3. A VCSEL laser temperature control method according to claim 2, wherein said connecting the thermistor and the digital potentiometer to the fully differential instrument amplification circuit respectively comprises: connecting the thermistor and the digital potentiometer with a second resistor and a third resistor of the fully differential instrument amplifying circuit respectively; the resistance of the digital potentiometer is a first resistance.
4. A VCSEL laser temperature control method according to claim 3, wherein said controlling the thermistor with an integrated digitally controlled constant current source comprises: and driving the thermistor by adopting a second current output by the integrated numerical control constant current source.
5. The VCSEL laser temperature control method of claim 4, wherein the controlling the digital potentiometer with the integrated digitally controlled constant current source comprises: and a third current output by the integrated numerical control constant current source is adopted to drive the digital potentiometer.
6. The method of claim 5, wherein the obtaining the temperature error digital signal using the bridge circuit comprises: the temperature error is converted into an error voltage signal by a bridge circuit, and the error voltage signal is converted into a temperature error digital signal by an analog-to-digital converter.
7. A VCSEL laser temperature control system, comprising: the temperature sensing module is used for collecting a temperature signal of the VCSEL laser; the signal conditioning module is used for improving the signal-to-noise ratio of the collected temperature signal of the VCSEL laser and inhibiting the common-mode noise of the temperature signal of the VCSEL laser; the analog-to-digital conversion module is used for converting the error voltage signal into a temperature error digital signal; a VCSEL laser for generating a temperature signal; the main control module is used for receiving the temperature error digital signal and determining a control step length and a control quantity; the integrated numerical control constant current source is used for driving the thermistor, the digital potentiometer and the semiconductor refrigerator; the thermistor and the digital potentiometer form a bridge circuit; the integrated numerical control constant current source consists of a power supply input, a serial SPI interface and a three-channel constant current source.
8. A VCSEL laser temperature control apparatus, comprising: the first main module is used for respectively connecting the thermistor and the digital potentiometer with the fully differential instrument amplifying circuit, inputting the temperature differential signal into the analog-to-digital converter and initializing the circuit; the second main module is used for setting the resistance value of the digital potentiometer according to the target working temperature of the VCSEL laser, setting the register value according to the output current of the integrated numerical control constant current source, and controlling the thermistor and the digital potentiometer by the integrated numerical control constant current source; the third main module is used for forming a bridge circuit by the thermistor and the digital potentiometer, obtaining a temperature error digital signal by adopting the bridge circuit, and determining a control step length and a control quantity according to the temperature error digital signal; the fourth main module is used for controlling the integrated numerical control constant current source to output a first current to drive the semiconductor refrigerator to control the temperature according to the control step length and the control quantity; the integrated numerical control constant current source consists of a power supply input, a serial SPI interface and a three-channel constant current source.
9. An electronic device, comprising:
at least one processor, at least one memory, and a communication interface; wherein,
the processor, the memory and the communication interface are communicated with each other;
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 6.
10. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1 to 6.
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| CN101174758A (en) * | 2007-10-30 | 2008-05-07 | 武汉电信器件有限公司 | Automatic control system of tunable laser based on lock wave |
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