CN207743965U - A kind of control circuit of laser optical transmission power - Google Patents
A kind of control circuit of laser optical transmission power Download PDFInfo
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- CN207743965U CN207743965U CN201721672003.5U CN201721672003U CN207743965U CN 207743965 U CN207743965 U CN 207743965U CN 201721672003 U CN201721672003 U CN 201721672003U CN 207743965 U CN207743965 U CN 207743965U
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- power
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Abstract
The utility model provides a kind of control circuit of laser optical transmission power,The influence that influx noise signal generates RF radiofrequency signals can be eliminated,Network reliability is good,It can be with adjust automatically laser optical transmission power,Hardware cost is low simultaneously,It is stable and reliable for performance,Compensate for the light emitting power of various lasers,Including the splitter being connected,RF detecting circuits,Switching circuit,Voltage attenuation circuit,Error amplifying circuit,Power amplifier,Laser,Sampling resistor,Laser adjusts laser optical transmission power according to the size of current of power amplifier,Reach the light emitting power of driving laser,Sampling resistor acquires the operating current variation of laser optical transmission power,Current signal is converted into d. c. voltage signal,Application condition is carried out with control voltage amplify output voltage in error amplifying circuit,Light emitting power for stable laser.
Description
Technical field
The utility model is related to field of laser device technology, specially a kind of control circuit of laser optical transmission power.
Background technology
RFoG technologies are a kind of accessing net based on cable television optical network network, and with the HFC that radio frequency transmission is basic business
The Chinese utility model patent of solution, Publication No. 201928291U discloses a kind of wired electricity of RFoG of 2.6GHz bandwidth
Depending on network system, in RFoG cable television network systems, in order to there are one stable network environment, how ensure to swash
Light device has stable light emitting power to be an important issue, in addition, the network in RFoG cable television network systems passes
In defeated, network uplink passback generates noise, and the influence that influx noise signal generates RF radiofrequency signals causes under network performance
Drop, network reliability are poor.
Utility model content
In view of the above-mentioned problems, the utility model provides a kind of control circuit of laser optical transmission power, can eliminate
The influence that influx noise signal generates RF radiofrequency signals, network reliability is good, can with adjust automatically laser optical transmission power,
Control efficiency is high, and flexibility ratio greatly improves, while hardware cost is low, light hair that is stable and reliable for performance, compensating for various lasers
Power is penetrated, the continuous development of RFoG cable TV network networks is adapted to, internet security and stability is improved, makes user fuller
Meaning.
Its technical solution is such：A kind of control circuit of laser optical transmission power, which is characterized in that including：
Splitter, for the RF radiofrequency signals of input to be divided into main road and branch output；
RF detecting circuits, the branch of the RF detecting circuits connection splitter, believe for RF radiofrequency signals and influx noise
Number it is transformed into direct voltage output,
Switching circuit, the switching circuit connect the RF detecting circuits, for filtering the transformation of influx noise signal demodulator
Voltage, become after the RF radiofrequency signals are carried out shaping and processing by DC voltage that the RF detecting circuits detection converts
High voltage exports；
Voltage attenuation circuit, the voltage attenuation circuit connecting valve circuit, the height for exporting the switching circuit
It is exported after voltage adjustment；
Error amplifying circuit, the error amplifying circuit connect voltage attenuation circuit, are used for the voltage attenuation circuit
The voltage of input carries out output control voltage after error amplification；
Power amplifier, the power amplifier connect the error amplifying circuit, are controlled according to the control voltage
The electric current of power amplifier；
Laser, the main road of the splitter connects the laser after connecting concatenated capacitance and resistance, for inputting
Radiofrequency signal is modulated, and the laser connects the power amplifier, according to the size of current of the power amplifier come
Laser optical transmission power is adjusted, the light emitting power of driving laser is reached；
Sampling resistor, the sampling resistor connect the laser and the error amplifying circuit, described sharp for acquiring
The operating current of light device light emitting power changes, and the current signal of the sampling resistor is converted to d. c. voltage signal, in institute
It states and carries out application condition amplification output voltage in error amplifying circuit with control voltage, be used for the light emitting work(of stable laser
Rate.
Further, the error amplifying circuit includes the level-one error amplifying circuit and second amplifying circuit being connected,
The two level error amplifying circuit connects the voltage attenuation circuit, the two level error amplifying circuit and voltage attenuation electricity
Road carries out error amplification output voltage and is amplified again to level-one error amplifying circuit so that the output of power amplifier can
Reach the light emitting power of driving laser, the level-one error amplifying circuit is wanted to connect with the sampling resistor and the laser
It connects, the amplification voltage signal of laser optical transmission power needs is adjusted out by sampling resistor.
Further, the input terminal of the splitter connects RF signal input end, the main road connection resistance R1 of the splitter
With the ends LD- of connecting laser after capacitance C1, the branch of the splitter is linked in sequence RF detecting circuits, switching circuit, voltage
Error amplifying circuit is connected after attenuator circuit, the RF detecting circuits, switching circuit, voltage attenuation circuit are separately connected power supply
VCC, the negative input end of the output end connection amplifier U2 of the voltage attenuation circuit, the negative input end of the amplifier U2 and institute
It states and is connected with the positive input terminal connection resistance R5 of feedback resistance R6, the amplifier U2 between the output end of amplifier U2 and is followed by
Ground, the output end of the amplifier U2 connect the positive input terminal of connection amplifier U1 after resistance R7, and the amplifier U1's is negative defeated
It is connected after entering the output end connection resistance R2 of connection resistance R3, the amplifier U1 between end and the output end of the amplifier U1
It is grounded to the poles e of the poles b of power amplifier Q1, the power amplifier Q1, the poles the c connection inductance L1 of the power amplifier Q1
It is connected to the ends LD- of laser afterwards, the negative input end of the amplifier U1 is also connected with the ends PD+ of the laser, the amplification
It is grounded after the negative input end connection sampling resistor R4 of device U1.
A kind of control circuit of laser optical transmission power of the utility model switching circuit and is declined using RF detecting circuits
Powered down road separates the RF radiofrequency signals of influx noise signal sum, by switching circuit by RF radiofrequency signals and influx noise
Signal is converted to voltage, the small voltage being converted to by influx noise signal of voltage has been filtered by switching circuit, by RF radio frequencies
The voltage that signal is converted to makes switching circuit output HIGH voltage voltage, changes the size of output voltage by error amplifying circuit
It controls the light emitting power of laser, eliminates the influence that influx noise signal generates RF radiofrequency signals, it can be with adjust automatically
Laser optical transmission power, control efficiency are high, and flexibility ratio greatly improves, at the same inductance in the utility model, capacitance, resistance,
Splitter, RF detections, switching circuit, voltage attenuation and error amplifier are all matured products, and market maintenance is big, and price is just
Preferably, delivery cycle is short, and cost is very low, applies in the RF radiofrequency signals of uplink CM transmittings, makes the competitiveness of product in market
It greatly improves, it can extensive use.
Description of the drawings
Fig. 1 is a kind of system block diagram of the control circuit of laser optical transmission power of the utility model；
Fig. 2 is a kind of partial circuit of the system block diagram of the control circuit of laser optical transmission power of the utility model
Figure.
Specific implementation mode
See Fig. 1, Fig. 2, a kind of control circuit of laser optical transmission power of the utility model, including：
Splitter 1, for main road and branch output will to be divided into from the RF radiofrequency signals of input；
RF detecting circuits 2, RF detecting circuits connect the branch of splitter 1, are used for RF radiofrequency signals and influx noise signal
Direct voltage output is transformed into,
Switching circuit 3, switching circuit 3 connect RF detecting circuits 2, the electricity for filtering the transformation of influx noise signal demodulator
Pressure becomes high voltage output after RF radiofrequency signals are carried out shaping and processing by the DC voltage that RF detecting circuit detections convert；
Voltage attenuation circuit 4,4 connecting valve circuit 5 of voltage attenuation circuit, the high voltage tune for exporting switching circuit
Output after whole；
Error amplifying circuit 5, error amplifying circuit 5 connects voltage attenuation circuit 4, for inputting voltage attenuation circuit 4
Voltage carry out error amplification after output control voltage；
Power amplifier 6, power amplifier 6 connect error amplifying circuit 5, and power amplifier is controlled according to control voltage
6 electric current；
The main road of laser 7, splitter 1 connects connecting laser 7 after concatenated capacitance and resistance, believes for input radio frequency
It number is modulated, laser 7 connects power amplifier 6, and laser optical transmitting is adjusted according to the size of current of power amplifier 6
Power reaches the light emitting power of driving laser 7；
Sampling resistor 8,8 connecting laser 6 of sampling resistor and error amplifying circuit 5 emit work(for acquiring laser optical
The operating current of rate changes, and the current signal of sampling resistor 8 is converted to d. c. voltage signal, in error amplifying circuit 5 with
It controls voltage and carries out application condition amplification output voltage, be used for the light emitting power of stable laser.
Error amplifying circuit includes the level-one error amplifying circuit and second amplifying circuit being connected, two level error amplification electricity
Road connects voltage attenuation circuit, and two level error amplifying circuit carries out error amplification output voltage with voltage attenuation circuit and missed to level-one
Poor amplifying circuit is amplified again so that the output of power amplifier can reach driving laser light emitting power, one
Grade error amplifying circuit is wanted to connect with sampling resistor and laser, and adjusting out laser optical transmission power by sampling resistor needs
Amplification voltage signal.See that Fig. 2, the input terminal of splitter 1 connect RF signal input end, the main road of splitter 1 connects resistance
The ends LD- of connecting laser 7 after R1 and capacitance C1, the branch of splitter 1 are linked in sequence RF detecting circuits 2, switching circuit 3, electricity
Error amplifying circuit is connected after pressure attenuator circuit 4, RF detecting circuits 2, switching circuit 3, voltage attenuation circuit 4 are separately connected power supply
VCC, the negative input end of the output end connection amplifier U2 of voltage attenuation circuit 4, negative input end and the amplifier U2 of amplifier U2
Output end between be connected with feedback resistance R6, be grounded after the positive input terminal connection resistance R5 of amplifier U2, amplifier U2's is defeated
Outlet connects the positive input terminal of connection amplifier U1 after resistance R7, the negative input end of amplifier U1 and the output end of amplifier U1 it
Between connect resistance R3, the poles b of power amplifier Q1, power amplifier Q1 are connected to after the output end connection resistance R2 of amplifier U1
The poles e ground connection, the ends LD- of laser 7, the negative input of amplifier U1 are connected to after the poles the c connection inductance L1 of power amplifier Q1
End is also connected with the ends PD+ of laser 7, is grounded after the negative input end connection sampling resistor R4 of amplifier U1.
A kind of control method of the control circuit of laser optical transmission power of the utility model, uplink CM（Cable
Modem, electric wire cable modem）The RF radiofrequency signals of transmission are divided into main signal and branch signal, main signal by splitter
Main path signal is sent on laser LD- by resistance R1 and coupled capacitor C1 and is directly modulated, and branch signal passes through RF detections
Circuit carry out high speed detection, by branch signal RF radiofrequency signals and influx noise signal be transformed into direct voltage output, directly
Galvanic electricity pressure passes through switching circuit, and the voltage that wherein influx noise signal is converted by RF detecting circuit detections is less than the door of switching circuit
Voltage limit cannot control and turn on the switch circuit, export low-voltage, the direct current that RF radiofrequency signals are converted by RF detecting circuit detections
Voltage is higher than the threshold voltage of switching circuit, turns on the switch circuit, output HIGH voltage, and high voltage is decayed by voltage attenuation circuit
The negative input end of the amplifier U2 of error originated from input amplifying circuit after adjustment, the voltage and amplifier of the negative input end of amplifier U2
The positive input terminal voltage of U2 carries out application condition and is amplified output, amplification output by the feedback resistance R6 amplifying circuits formed
Voltage the positive input terminal of amplifier U1 is sent to by current-limiting resistance R7, amplifier U1 positive input terminals voltage is born defeated with amplifier U1
The voltage progress application condition for entering end is amplified output by the feedback resistance R3 amplifying circuits formed, amplifies the voltage of output
It is sent to the poles b of power amplifier Q1 by current-limiting resistance R2, changes the voltage of the poles b of power amplifier Q1 to control the poles c of Q1
The electric current of the poles e of Q1 is flowed to, the ends the LD- electric current of laser 7 is connected to the poles c of Q1 by impedance inductance L1, changes the poles c of Q1
Size of current emits luminous power to adjust laser, and laser transmitting luminous power passes through laser feedback section PD+ and sampling resistor
The operating current variation of the Feedback of Power adjustment circuit of R4 compositions, sampling resistor R4 acquisition laser transmitting optical power feedbacks is straight
Galvanic electricity pressure, DC voltage give amplifier U1 negative input ends and carry out application condition with amplifier U1 positive input terminal voltages, and amplification is defeated
The out transmitting luminous power of stable laser reduces interference of the influx noise of network uplink passback to CM signals, improves net
The reliability of network.
Basic principles, main features, and advantages of the present invention has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the present utility model is not limited to the above embodiments, described in above embodiments and description
Only the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model also has
Various changes and modifications, these various changes and improvements fall within the scope of the claimed invention.The requires of the utility model
Protection domain is defined by the appending claims and its equivalent thereof.
Claims (3)
1. a kind of control circuit of laser optical transmission power, which is characterized in that including：
Splitter, for the RF radiofrequency signals of input to be divided into main road and branch output；
RF detecting circuits, the branch of the RF detecting circuits connection splitter, become for RF radiofrequency signals and influx noise signal
Change direct voltage output into,
Switching circuit, the switching circuit connect the RF detecting circuits, the electricity for filtering the transformation of influx noise signal demodulator
Pressure becomes high electricity after the RF radiofrequency signals are carried out shaping and processing by the DC voltage that the RF detecting circuits detection converts
Pressure output；
Voltage attenuation circuit, the voltage attenuation circuit connecting valve circuit, the high voltage for exporting the switching circuit
It is exported after adjustment；
Error amplifying circuit, the error amplifying circuit connects voltage attenuation circuit, for inputting the voltage attenuation circuit
Voltage carry out error amplification after output control voltage；
Power amplifier, the power amplifier connect the error amplifying circuit, power are controlled according to the control voltage
The electric current of amplifier；
Laser, the main road of the splitter connect the laser after connecting concatenated capacitance and resistance, are used for input radio frequency
Signal is modulated, and the laser connects the power amplifier, is adjusted according to the size of current of the power amplifier
Laser optical transmission power reaches the light emitting power of driving laser；
Sampling resistor, the sampling resistor connects the laser and the error amplifying circuit, for acquiring the laser
The operating current of light emitting power changes, and the current signal of the sampling resistor is converted to d. c. voltage signal, in the mistake
Application condition is carried out with control voltage in poor amplifying circuit and amplify output voltage, be used for the light emitting power of stable laser.
2. a kind of control circuit of laser optical transmission power according to claim 1, it is characterised in that：The error is put
Big circuit includes the level-one error amplifying circuit being connected and two level error amplifying circuit, the two level error amplifying circuit connection
The voltage attenuation circuit, the two level error amplifying circuit carry out error amplification output voltage with the voltage attenuation circuit and give
Level-one error amplifying circuit is amplified again so that the output of power amplifier can reach the light emitting work(of driving laser
Rate, the level-one error amplifying circuit are wanted to connect, be adjusted out by sampling resistor sharp with the sampling resistor and the laser
The amplification voltage signal that light device light emitting power needs.
3. a kind of control circuit of laser optical transmission power according to claim 2, it is characterised in that：The splitter
Input terminal connect RF signal input end, connecting laser after the main road connection resistance R1 and capacitance C1 of the splitter
The ends LD-, the branch of the splitter are linked in sequence connection error amplification after RF detecting circuits, switching circuit, voltage attenuation circuit
Circuit, the RF detecting circuits, switching circuit, voltage attenuation circuit are separately connected power supply VCC, the voltage attenuation circuit it is defeated
Outlet connects the negative input end of amplifier U2, connects between the negative input end of the amplifier U2 and the output end of the amplifier U2
It is grounded after being connected to the positive input terminal connection resistance R5 of feedback resistance R6, the amplifier U2, the output end of the amplifier U2 connects
The positive input terminal of amplifier U1, the output end of the negative input end of the amplifier U1 and the amplifier U1 are connected after connecting resistance R7
Between connection resistance R3, the amplifier U1 output end connection resistance R2 after be connected to the poles b of power amplifier Q1, the work(
The poles e of rate amplifier Q1 are grounded, and the ends LD- of laser are connected to after the poles the c connection inductance L1 of the power amplifier Q1, described
The negative input end of amplifier U1 is also connected with the ends PD+ of the laser, and the negative input end of the amplifier U1 connects sampling resistor
It is grounded after R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721672003.5U CN207743965U (en) | 2017-12-05 | 2017-12-05 | A kind of control circuit of laser optical transmission power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721672003.5U CN207743965U (en) | 2017-12-05 | 2017-12-05 | A kind of control circuit of laser optical transmission power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207743965U true CN207743965U (en) | 2018-08-17 |
Family
ID=63117172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721672003.5U Withdrawn - After Issue CN207743965U (en) | 2017-12-05 | 2017-12-05 | A kind of control circuit of laser optical transmission power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207743965U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968683A (en) * | 2017-12-05 | 2018-04-27 | 无锡路通视信网络股份有限公司 | A kind of control circuit and control method of laser optical transmission power |
-
2017
- 2017-12-05 CN CN201721672003.5U patent/CN207743965U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968683A (en) * | 2017-12-05 | 2018-04-27 | 无锡路通视信网络股份有限公司 | A kind of control circuit and control method of laser optical transmission power |
| CN107968683B (en) * | 2017-12-05 | 2023-07-28 | 无锡路通视信网络股份有限公司 | Control circuit and control method for light emission power of laser |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180817 Effective date of abandoning: 20230728 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20180817 Effective date of abandoning: 20230728 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |