CN107968683B - Control circuit and control method for light emission power of laser - Google Patents
Control circuit and control method for light emission power of laser Download PDFInfo
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- CN107968683B CN107968683B CN201711271446.8A CN201711271446A CN107968683B CN 107968683 B CN107968683 B CN 107968683B CN 201711271446 A CN201711271446 A CN 201711271446A CN 107968683 B CN107968683 B CN 107968683B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/564—Power control
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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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The utility model provides a control circuit of laser light emission power, which can eliminate the influence of converging noise signals on RF radio frequency signals, has good network reliability, can automatically adjust the laser light emission power, has low hardware cost, stable and reliable performance, compensates the light emission power of different lasers, comprises a branch device, an RF detection circuit, a switching circuit, a voltage attenuation circuit, an error amplification circuit, a power amplifier, a laser and a sampling resistor which are connected, wherein the laser adjusts the laser light emission power according to the current of the power amplifier so as to drive the light emission power of the laser, the sampling resistor collects the working current change of the laser light emission power, converts the current signals into direct current voltage signals, and performs error comparison with control voltage in the error amplification circuit to amplify the output voltage for stabilizing the light emission power of the laser.
Description
Technical Field
The utility model relates to the technical field of lasers, in particular to a control circuit and a control method for the light emission power of a laser.
Background
The RFoG technology is a solution of HFC access network based on cable TV optical fiber network and using radio frequency transmission as basic service, chinese patent publication No. 201928291U discloses an RFoG cable TV network system with 2.6GHz bandwidth, in which, in order to have a stable network environment, how to ensure stable optical emission power of a laser is an important subject, in addition, in the network transmission of the RFoG cable TV network system, the network uplink feedback generates noise, and the influence of the converged noise signal on RF radio frequency signal causes the network performance to be reduced, and the network reliability is poor.
Disclosure of Invention
Aiming at the problems, the utility model provides a control circuit for the optical emission power of a laser, which can eliminate the influence of converging noise signals on RF radio frequency signals, has good network reliability, can automatically adjust the optical emission power of the laser, has high control efficiency and greatly improves the flexibility, meanwhile, has low hardware cost and stable and reliable performance, compensates the optical emission power of different lasers, adapts to the continuous development of an RFoG cable television network, improves the network safety and stability, and enables users to be more satisfied.
The technical scheme is as follows: a control circuit for the optical emission power of a laser, comprising:
a splitter for splitting an input RF radio frequency signal into a main path and a branch path for output;
an RF detection circuit connected to the branch of the splitter for converting the RF signal and the aggregate noise signal into DC voltage output,
the switching circuit is connected with the RF detection circuit and used for filtering the voltage converted by the detection of the converged noise signal, and shaping and processing the direct-current voltage converted by the detection of the RF radio-frequency signal by the RF detection circuit to obtain high-voltage output;
the voltage attenuation circuit is connected with the switch circuit and is used for outputting the high voltage output by the switch circuit after being regulated;
the error amplifying circuit is connected with the voltage attenuating circuit and is used for outputting control voltage after carrying out error amplification on the voltage input by the voltage attenuating circuit;
the power amplifier is connected with the error amplifying circuit and used for controlling the current of the power amplifier according to the control voltage;
the main path of the branching device is connected with the capacitor and the resistor in series and then is connected with the laser for inputting radio frequency signals for modulation, the laser is connected with the power amplifier, and the light emission power of the laser is adjusted according to the current of the power amplifier so as to drive the light emission power of the laser;
the sampling resistor is connected with the laser and the error amplifying circuit and is used for collecting working current change of the light emission power of the laser, converting a current signal of the sampling resistor into a direct-current voltage signal, and performing error comparison with a control voltage in the error amplifying circuit to amplify an output voltage for stabilizing the light emission power of the laser.
Further, the error amplifying circuit comprises a first-stage error amplifying circuit and a second-stage error amplifying circuit which are connected, the second-stage error amplifying circuit is connected with the voltage attenuating circuit, the second-stage error amplifying circuit and the voltage attenuating circuit carry out error amplification to output voltage to the first-stage error amplifying circuit for amplification again, so that the output of the power amplifier can reach the light emission power of a driving laser, and the first-stage error amplifying circuit is connected with the sampling resistor and the laser, and an amplified voltage signal required by the light emission power of the laser is regulated through the sampling resistor. Further, the input end of the branching device is connected with the radio frequency signal input end, the main path of the branching device is connected with the resistor R1 and the capacitor C1 and then is connected with the LD-end of the laser, the branch path of the branching device is sequentially connected with the RF detection circuit, the switching circuit and the voltage attenuation circuit and then is connected with the error amplifying circuit, the RF detection circuit, the switching circuit and the voltage attenuation circuit are respectively connected with the power VCC, the output end of the voltage attenuation circuit is connected with the negative input end of the amplifier U2, a feedback resistor R6 is connected between the negative input end of the amplifier U2 and the output end of the amplifier U2, the positive input end of the amplifier U2 is connected with the resistor R5 and then is grounded, the output end of the amplifier U2 is connected with the positive input end of the amplifier U1 after the resistor R7, the output end of the amplifier U1 is connected with the resistor R3, the output end of the amplifier U1 is connected with the electrode b of the power amplifier Q1 after the resistor R2, the negative input end of the power amplifier Q1 is connected with the PD 1 and then is connected with the negative end of the laser, and then the input end of the laser is connected with the positive input end of the amplifier Q1 after the amplifier C1 is connected with the positive electrode of the resistor PD 4.
A control method of laser light emission power is characterized in that: the RF signal is divided into a main signal and a branch signal through a branching device, the main signal is modulated by a resistor and a capacitor, the branch signal is converted into a direct current voltage by an RF detection circuit, the direct current voltage is output by a switch circuit, the voltage of the converged noise signal detected and converted by the RF detection circuit is lower than the threshold voltage of the switch circuit, the switch circuit is opened by the direct current voltage of the RF detection circuit, a high voltage is output, the high voltage is attenuated and regulated by the RF detection circuit and then is input into an error amplification circuit, the error amplification circuit is used for amplifying errors, the output control voltage is transmitted to a power amplifier, the current of the power amplifier is controlled, the light emission power of the laser is driven, the laser feeds back the light emission power to the error amplification circuit through a sampling resistor, the working current fed back by the light emission power of the laser is collected by the sampling resistor and changed into the direct current, the direct current is compared with the voltage of the input error amplification circuit, and the output voltage is amplified for stabilizing the light emission power of the laser.
The utility model relates to a control circuit for laser light emission power, which utilizes an RF detection circuit, a switching circuit and an attenuation circuit to separate an RF signal with a converging noise signal and an RF signal with a converging noise signal, converts the RF signal with the converging noise signal into voltage through the switching circuit, filters the voltage converted by the converging noise signal with small voltage through the switching circuit, enables the switching circuit to output high-voltage by the voltage converted by the RF signal, controls the light emission power of the laser by changing the output voltage through an error amplification circuit, eliminates the influence of the converging noise signal on the RF signal, can automatically adjust the light emission power of the laser, has high control efficiency and greatly improves the flexibility, and simultaneously has large market preservation quantity, low price, short supply period and very low cost, and can be widely applied to the RF signal emitted by an uplink CM.
Drawings
FIG. 1 is a system block diagram of a control circuit for laser optical emission power according to the present utility model;
fig. 2 is a partial circuit diagram of a system block diagram of a control circuit for laser light emission power according to the present utility model.
Detailed Description
Referring to fig. 1 and 2, a control circuit for optical emission power of a laser according to the present utility model includes:
a splitter 1 for splitting an RF radio frequency signal inputted from an input into a main path and a branch path for outputting;
an RF detection circuit 2 connected to the branch of the branching device 1 for converting the RF signal and the converging noise signal into DC voltage output,
a switch circuit 3, the switch circuit 3 is connected with the RF detection circuit 2, and is used for filtering the voltage converted by the detection of the converged noise signal, shaping and processing the DC voltage converted by the detection of the RF detection circuit, and converting the DC voltage into high voltage output;
the voltage attenuation circuit 4 is connected with the switch circuit 5 and is used for adjusting and outputting the high voltage output by the switch circuit;
the error amplifying circuit 5 is connected with the voltage attenuating circuit 4 and is used for amplifying the voltage input by the voltage attenuating circuit 4 in error and outputting a control voltage;
a power amplifier 6, the power amplifier 6 being connected to the error amplifying circuit 5, the current of the power amplifier 6 being controlled in accordance with the control voltage;
the main path of the branching device 1 is connected with a capacitor and a resistor which are connected in series and then is connected with the laser 7, and the laser 7 is used for inputting radio frequency signals for modulation, the laser 7 is connected with the power amplifier 6, and the light emission power of the laser is regulated according to the current of the power amplifier 6 so as to drive the light emission power of the laser 7;
the sampling resistor 8 is connected with the laser 6 and the error amplifying circuit 5, and is used for collecting the working current change of the light emission power of the laser, converting the current signal of the sampling resistor 8 into a direct-current voltage signal, and performing error comparison with the control voltage in the error amplifying circuit 5 to amplify the output voltage so as to stabilize the light emission power of the laser.
The error amplifying circuit comprises a first-stage error amplifying circuit and a second-stage error amplifying circuit which are connected, the second-stage error amplifying circuit is connected with the voltage attenuating circuit, the second-stage error amplifying circuit and the voltage attenuating circuit amplify the error amplifying output voltage for the first-stage error amplifying circuit again, so that the output of the power amplifier can reach the light emission power of the driving laser, the first-stage error amplifying circuit is connected with the sampling resistor and the laser, and the sampling resistor is used for adjusting the amplified voltage signal required by the light emission power of the laser.
Referring to fig. 2, an input end of the splitter 1 is connected with a radio frequency signal input end, a main path of the splitter 1 is connected with a resistor R1 and a capacitor C1 and then is connected with an LD-end of a laser 7, a branch path of the splitter 1 is sequentially connected with an RF detection circuit 2, a switch circuit 3 and a voltage attenuation circuit 4 and then is connected with an error amplifying circuit, the RF detection circuit 2, the switch circuit 3 and the voltage attenuation circuit 4 are respectively connected with a power VCC, an output end of the voltage attenuation circuit 4 is connected with a negative input end of an amplifier U2, a feedback resistor R6 is connected between the negative input end of the amplifier U2 and the output end of the amplifier U2, a positive input end of the amplifier U2 is connected with a resistor R5 and then is grounded, an output end of the amplifier U2 is connected with a positive input end of the amplifier U1, a negative input end of the amplifier U1 is connected with a resistor R3, an output end of the amplifier U1 is connected with a b electrode of a power amplifier Q1 after the resistor R2 is connected with a negative electrode of the amplifier Q1, an e electrode of the power amplifier Q1 is grounded, a positive input end of the power amplifier Q1 is connected with a negative input end of the laser 7 is connected with a positive input end of the laser 7, and then is connected with a positive input end of the laser 7.
The utility model relates to a control method of laser light emission power, an RF radio frequency signal sent by an uplink CM (Cable Modem) is divided into a main signal and a branch signal by a branch device, the main signal is sent to a laser LD-to be directly modulated by a resistor R1 and a coupling capacitor C1, the branch signal is subjected to high-speed detection by the RF detection circuit, the RF radio frequency signal and a converging noise signal in the branch signal are converted into direct-current voltage to be output, the direct-current voltage passes through a switch circuit, the voltage of the converging noise signal detected and converted by the RF detection circuit is lower than the threshold voltage of the switch circuit, the switch circuit is turned on, the low voltage is outputted, the direct-current voltage of the RF radio frequency signal detected and converted by the RF detection circuit is higher than the threshold voltage of the switch circuit, the switch circuit is turned on, the high voltage is outputted, the high voltage is attenuated and regulated by a voltage attenuation circuit and then is inputted to the negative input end of an amplifier U2 of an error amplifier circuit, the voltage of the negative input end of the amplifier U2 is subjected to be amplified by a feedback resistor R6, the voltage of the amplifier output is amplified by the amplifier U1 to be amplified by the amplifier circuit through a positive input end of the amplifier U1, the current of the current attenuation circuit is outputted by the current attenuation circuit, the current of the amplifier U1 is outputted by the current-to be amplified by the Q1 to be amplified by the Q-to be outputted by the Q1, the Q-current of the Q-current amplifier is changed by the Q1, the Q-to be outputted by the Q1 is amplified by the current of the current amplifier to be amplified by the Q1 through the Q-current amplifier, the Q1 is amplified by the Q1, the laser emission light power is changed into direct current voltage through a power feedback adjusting circuit formed by a laser feedback section PD+ and a sampling resistor R4, the sampling resistor R4 collects working current fed back by the laser emission light power, the direct current voltage is fed to the negative input end of the amplifier U1 to be compared with the voltage of the positive input end of the amplifier U1 in error, the emission light power of the laser is amplified and output to be stabilized, interference of converging noise returned by the network on CM signals is reduced, and the reliability of the network is improved.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (4)
1. A control circuit for the optical emission power of a laser, comprising:
a splitter for splitting an input RF radio frequency signal into a main path and a branch path for output;
an RF detection circuit connected to the branch of the splitter for converting the RF signal and the aggregate noise signal into DC voltage output,
the switching circuit is connected with the RF detection circuit and used for filtering the voltage converted by the detection of the converged noise signal, and shaping and processing the direct-current voltage converted by the detection of the RF radio-frequency signal by the RF detection circuit to obtain high-voltage output;
the voltage attenuation circuit is connected with the switch circuit and is used for outputting the high voltage output by the switch circuit after being regulated;
the error amplifying circuit is connected with the voltage attenuating circuit and is used for outputting control voltage after carrying out error amplification on the voltage input by the voltage attenuating circuit;
the power amplifier is connected with the error amplifying circuit and used for controlling the current of the power amplifier according to the control voltage;
the main path of the branching device is connected with the capacitor and the resistor in series and then is connected with the laser for inputting radio frequency signals for modulation, the laser is connected with the power amplifier, and the light emission power of the laser is adjusted according to the current of the power amplifier so as to drive the light emission power of the laser;
the sampling resistor is connected with the laser and the error amplifying circuit and is used for collecting working current change of the light emission power of the laser, converting a current signal of the sampling resistor into a direct-current voltage signal, and performing error comparison with a control voltage in the error amplifying circuit to amplify an output voltage for stabilizing the light emission power of the laser.
2. A control circuit for laser light emission power as defined in claim 1, wherein: the error amplifying circuit comprises a primary error amplifying circuit and a secondary error amplifying circuit which are connected, the secondary error amplifying circuit is connected with the voltage attenuating circuit, the secondary error amplifying circuit and the voltage attenuating circuit conduct error amplification to output voltage to the primary error amplifying circuit for amplification again, so that the output of the power amplifier can reach the light emission power of the driving laser, the primary error amplifying circuit is connected with the sampling resistor and the laser, and the amplified voltage signal required by the light emission power of the laser is regulated through the sampling resistor.
3. A control circuit for laser light emission power as defined in claim 2, wherein: the input end of the branching device is connected with the radio frequency signal input end, the main path of the branching device is connected with the resistor R1 and the LD-end of the laser after the capacitor C1, the branch path of the branching device is sequentially connected with the RF detection circuit, the switching circuit and the voltage attenuation circuit and then is connected with the error amplifying circuit, the RF detection circuit, the switching circuit and the voltage attenuation circuit are respectively connected with the power VCC, the output end of the voltage attenuation circuit is connected with the negative input end of the amplifier U2, a feedback resistor R6 is connected between the negative input end of the amplifier U2 and the output end of the amplifier U2, the positive input end of the amplifier U2 is connected with the positive input end of the amplifier U1 after the positive input end of the amplifier U7 is connected with the positive input end of the amplifier U1, the negative input end of the amplifier U1 is connected with the resistor R3, the output end of the amplifier U1 is connected with the b pole of the power amplifier Q1 after the output end of the amplifier U2 is connected with the power LD, the e pole of the power amplifier Q1 is connected with the negative input end of the laser is connected with the positive input end of the amplifier U1, and the positive input end of the PD is connected with the positive input end of the laser is connected with the laser 4.
4. A control method of laser light emission power is characterized in that: the RF signal is divided into a main signal and a branch signal through a branching device, the main signal is modulated by a resistor and a capacitor, the branch signal is converted into a direct current voltage by an RF detection circuit, the direct current voltage is output by a switch circuit, the voltage of the converged noise signal detected and converted by the RF detection circuit is lower than the threshold voltage of the switch circuit, the switch circuit is opened by the direct current voltage of the RF detection circuit, a high voltage is output, the high voltage is attenuated and regulated by the RF detection circuit and then is input into an error amplification circuit, the error amplification circuit is used for amplifying errors, the output control voltage is transmitted to a power amplifier, the current of the power amplifier is controlled, the light emission power of the laser is driven, the laser feeds back the light emission power to the error amplification circuit through a sampling resistor, the working current fed back by the light emission power of the laser is collected by the sampling resistor and changed into the direct current, the direct current is compared with the voltage of the input error amplification circuit, and the output voltage is amplified for stabilizing the light emission power of the laser.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711271446.8A CN107968683B (en) | 2017-12-05 | 2017-12-05 | Control circuit and control method for light emission power of laser |
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| CN201711271446.8A CN107968683B (en) | 2017-12-05 | 2017-12-05 | Control circuit and control method for light emission power of laser |
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| CN107968683A CN107968683A (en) | 2018-04-27 |
| CN107968683B true CN107968683B (en) | 2023-07-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108969898B (en) * | 2018-06-29 | 2019-12-10 | 河南省宇安医疗科技开发有限公司 | Impedance matching type optical power control circuit of semiconductor laser pain therapeutic apparatus |
| CN113890623B (en) * | 2021-10-27 | 2024-06-11 | 广东兴颂科技有限公司 | Optical communication transmitting power adjustable circuit |
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