CN109244826A - Laser driving circuit and optical module - Google Patents
Laser driving circuit and optical module Download PDFInfo
- Publication number
- CN109244826A CN109244826A CN201811356600.6A CN201811356600A CN109244826A CN 109244826 A CN109244826 A CN 109244826A CN 201811356600 A CN201811356600 A CN 201811356600A CN 109244826 A CN109244826 A CN 109244826A
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- laser
- voltage
- circuit
- modulation
- negative
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
Abstract
It includes: voltage follower circuit, negative-feedback circuit and laser that the embodiment of the present invention, which provides a kind of laser driving circuit and optical module, the laser driving circuit,；The negative-feedback circuit is connect with the voltage follower circuit and the laser respectively；The voltage follower circuit is used to export modulation voltage to the negative-feedback circuit, and the modulation voltage is digital voltage or analog voltage；The negative-feedback circuit is used to provide modulation electric current to the laser, and receives the negative-feedback signal of the laser output；The laser is used to shine under the action of the modulation electric current.The present embodiment solves the problems, such as that laser Electro-optical Modulation is limited.
Description
Technical field
The present invention relates to technical field of optical fiber communication more particularly to a kind of laser driving circuit and optical module.
Background technique
With the sharp increase of social progress and information content, demand of the people to the rate of information throughput is also increasingly
It is high.Therefore, the optical communication technique that can satisfy people's more high bandwidth requirements and rate requirement is come into being.
In existing optical communication technique, in order to realize the transmission of data in a fiber, needs to configure in optical module and use
In the laser and laser driving chip that convert electrical signals to optical signal.Wherein, laser driving chip can will be outer
0,1 electric signal of portion's input is converted to corresponding bias current I_BIAS electric current and modulation electric current I_Mod.Needs are issued
Data-signal, then by modulate electric current I_Mod be modulated on bias current I_BIAS, and then laser by data shift signal at
Optical signal is coupled to optical fiber, and then is sent out by fiber optic network.
However, laser driving chip is modulated for electric signal as 0,1, the Electro-optical Modulation of laser by
Limit.
Summary of the invention
The embodiment of the present invention provides a kind of laser driving circuit and optical module, to overcome the Electro-optical Modulation of laser limited
The problem of.
The embodiment of the present invention provides a kind of laser driving circuit, comprising: voltage follower circuit, negative-feedback circuit and swash
Light device；Wherein
The negative-feedback circuit is connect with the voltage follower circuit and the laser respectively；
The voltage follower circuit is used to export modulation voltage to the negative-feedback circuit, and the modulation voltage is number electricity
Pressure or analog voltage；
The negative-feedback circuit is used to provide modulation electric current to the laser, and receives the negative anti-of the laser output
Feedback signal；
The laser is used to shine under the action of the modulation electric current.
In a kind of possible design, the negative-feedback circuit includes operational amplifier and resistance；Wherein
The non-inverting input terminal of the operational amplifier is connect with the voltage follower circuit；
The inverting input terminal of the operational amplifier is connect with one end of the resistance, the other end ground connection of the resistance；
The output end of the operational amplifier is connect with the input terminal of the laser, the output end of the laser also with
One end of the resistance connects.
" empty short " and " void is disconnected " phenomenon using operational amplifier Q1, realizing can be to laser by modulation voltage
Modulation electric current is provided, the problem of directly laser connection modulation voltage is caused electric current too small, can not drive laser is avoided.
In a kind of possible design, the voltage follower circuit includes external power supply；Wherein
One end of the external power supply is connect with the non-inverting input terminal of the operational amplifier.
Modulation voltage is exported by external power supply, simplifies the structure of laser driving circuit, it is easy to accomplish.
In a kind of possible design, the voltage follower circuit includes micro-control unit；Wherein
The micro-control unit is connect with the non-inverting input terminal of the operational amplifier；
The micro-control unit is used to export modulation voltage according to modulation program.
In a kind of possible design, the voltage follower circuit further includes processor；
The micro-control unit is also connected to the processor；
The processor is used to send modulation program to the micro-control unit.
Modulation voltage is exported according to modulation program by micro-control unit, so that the Electro-optical Modulation of laser is easily controllable.
In a kind of possible design, the micro-control unit includes digital analog converter；
The digital analog converter is used to the modulation program being converted to analog voltage.
In a kind of possible design, the processor is connect with the micro-control unit by IC bus IIC.
In a kind of possible design, the resistance is variable resistance.
In a kind of possible design, the variable resistance is digital variable resistance.
Second aspect, the embodiment of the present invention provide a kind of optical module, including first aspect as above or first aspect is various can
Driving circuit described in the design of energy.
Laser driving circuit provided in this embodiment, comprising: voltage follower circuit, negative-feedback circuit and laser；
Negative-feedback circuit is connect with voltage follower circuit and laser respectively；Voltage follower circuit is used to export to negative-feedback circuit and modulate
Voltage, negative-feedback circuit is used to provide modulation electric current to laser, and receives the negative-feedback signal of laser output；Laser is used
In luminous under the action of modulating electric current.The present embodiment realizes Electro-optical Modulation by modulation voltage, which can be number
Word voltage, to realize the driving of the digital signal of changeable frequency, which can also be analog voltage, to realize mould
The driving that the driving of quasi- voltage, the i.e. laser driving circuit are suitable for number and simulation simultaneously, so that the laser drives
Dynamic circuit can be adapted for several scenes, solve the problems, such as that existing laser Electro-optical Modulation is limited.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of fiber optic network provided in an embodiment of the present invention.
Fig. 2 is the structural schematic diagram one of laser driving circuit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram two of laser driving circuit provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram three of laser driving circuit provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram four of laser driving circuit provided in an embodiment of the present invention；
Fig. 6 is the schematic diagram of Electro-optical Modulation provided in an embodiment of the present invention.
Description of symbols:
10- voltage follower circuit；
20- negative-feedback circuit；
30- laser；
11- external power supply；
12- micro-control unit；
13- processor.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 1 is the structural schematic diagram of fiber optic network provided in an embodiment of the present invention.As shown in Figure 1, the fiber optic network includes
Optical network unit (Optical Network Unit, ONU), optical line terminal (Optical Line Terminal, OLT) with
And wide area network (Wide Area Network, WAN).
Optical network unit is generally arranged at user terminal, such as computer, the smart machine of user etc. can equipment for surfing the net.On this
Net equipment can be connect by optical network unit with wide area network, realize web browsing.The connection of optical network unit and wide area network is logical
Cross optical line terminal transfer realization.There is optical module in light network unit, sent out by laser in optical module to optical line terminal
Optical signals are realized between optical network unit and optical line terminal and are communicated.
Wherein, establish one-to-many connection between optical line terminal and optical network unit, each optical line terminal with it is multiple
Data interaction is carried out with time division mode between optical network unit.
The embodiment of the present invention gives a kind of configuration diagram of possible fiber optic network, for other possible fiber optic networks
Structure, details are not described herein again for the present embodiment.
The present embodiment carries out specifically for the laser drive circuit in the optical module and optical module in optical network unit
It is bright.Laser drive circuit provided in this embodiment is that modulation is realized by variable voltage, which can be changed
Voltage can be digital signal or analog signal, so as to improve the scope of application of laser driver.
It is described in detail below with technical solution of the specifically embodiment to the application.These specific implementations below
Example can be combined with each other, and the same or similar concept or process may be repeated no more in some embodiments.
Fig. 2 is the structural schematic diagram one of laser driving circuit provided in an embodiment of the present invention；As shown in Fig. 2, the laser
Device driving circuit, comprising: voltage follower circuit 10, negative-feedback circuit 20 and laser 30.Negative-feedback circuit 20 respectively with electricity
Voltage follower circuit 10 and laser 30 connect.
Voltage follower circuit 10 is used to export modulation voltage to negative-feedback circuit 20, and negative-feedback circuit 20 is used for laser
30 provide modulation electric current；Laser 30 is used to shine under the action of modulating electric current.
Specifically, which exports modulation voltage, which refers to that voltage swing occurs at any time
Variation.
Negative-feedback circuit 20 provides modulation electric current to laser 30 according to the modulation voltage of input.In negative-feedback circuit 20
Under the action of, in the limited situation of size of modulation voltage, it is also possible that the modulation electric current reaches the driving of laser 30
Electric current guarantees that laser 30 can shine.The size of the modulation electric current and the size direct proportionality of modulation voltage.
The negative-feedback circuit 20 may include the components such as diode, triode, and the present embodiment is to 20 institute of negative-feedback circuit
Including component be not particularly limited, as long as can according to modulation voltage to laser 30 provide modulation electric current.
Laser 30 is used to shine under the action of modulating electric current.Wherein, the intensity for the optical signal which issues
With the size direct proportionality of the modulation voltage.When voltage is big, then the intensity of optical signal is big, and when voltage is small, then light is believed
Number intensity it is small.By modulating different voltage, Electro-optical Modulation, i.e. modulation of the electric signal to optical signal are realized.
In one possible implementation, the modulation voltage can be include high level and low level digital voltage.
The negative-feedback circuit 20 provides modulation electric current to laser according to the modulation voltage.When digital voltage is high level, then laser
Device 30 sends out light (intensity is big) big, and when digital voltage is low level, then laser 30 sends out light small (intensity is small).The present embodiment may be used also
To be modulated to high level and low level frequency, by the way that Electro-optical Modulation may be implemented to high level and low level modulation.
In alternatively possible implementation, which can be analog voltage, which can be positive
String voltage or cosinusoidal voltage.The negative-feedback circuit 20 provides modulation electric current to laser according to the analog voltage.30 institute of laser
The optical signal of sending is sinusoidal optical signal or cosine optical signal, passes through the tune of the amplitude of sinusoidal voltage or cosinusoidal voltage, phase etc.
System, may be implemented Electro-optical Modulation.
Further, the signal that laser 30 exports can also feed back to negative-feedback circuit 20, and negative-feedback circuit 20 is according to this
Negative-feedback signal carries out negative-feedback process.
Laser driving circuit provided in this embodiment, comprising: voltage follower circuit, negative-feedback circuit and laser；
Negative-feedback circuit is connect with voltage follower circuit and laser respectively；Voltage follower circuit is used to export to negative-feedback circuit and modulate
Voltage, negative-feedback circuit is used to provide modulation electric current to laser, and receives the negative-feedback signal of laser output；Laser is used
In luminous under the action of modulating electric current.The present embodiment realizes Electro-optical Modulation by modulation voltage, which can be number
Word voltage, to realize the driving of the digital signal of changeable frequency, which can also be analog voltage, to realize mould
The driving that the driving of quasi- voltage, the i.e. laser driving circuit are suitable for number and simulation simultaneously, so that the laser drives
Dynamic circuit can be adapted for several scenes, solve the problems, such as that existing laser Electro-optical Modulation is limited.
Fig. 3 is the structural schematic diagram two of laser driving circuit provided in an embodiment of the present invention；As shown in figure 3, negative-feedback
Circuit 20 includes operational amplifier Q1 and resistance R；Wherein, the non-inverting input terminal a of operational amplifier Q1 and voltage follower circuit 10
Connection；The inverting input terminal b of operational amplifier Q1 is connect with one end of resistance R, the other end ground connection of resistance R；Operational amplifier
The output end of Q1 is connect with the input terminal of laser 30, and the output end of laser 30 is also connect with one end of resistance R.
Specifically, there are two input terminal and an output ends for operational amplifier Q1 tool.Two input terminals are referred to as same phase
Input terminal a and inverting input terminal b.In the present embodiment, non-inverting input terminal a connects power supply, and inverting input terminal b is grounded, then this reality
Applying the power supply that an operational amplifier Q1 is connect is single supply.
Since the voltage amplification factor of operational amplifier Q1 is very big, and operational amplifier Q1 work is in linear zone, is one
Linear amplifier circuit, output voltage without departing from the range of linearity (i.e. finite value), so, operational amplifier Q1 non-inverting input terminal and anti-
The current potential of phase input terminal is very close to equal.So the voltage difference of two input terminal of operational amplifier Q1, in 1mV hereinafter, approximation two
Input terminal shortcircuit.This characteristic is known as " empty short ".Since operational amplifier Q1 has the phenomenon that " empty short ", so Va=Vb.
Since the input resistance of operational amplifier Q1 is generally all at several hundred kilo-ohms or more, operational amplifier Q1 is flowed into mutually defeated
The electric current entered in end and inverting input terminal is very small, and several orders of magnitude smaller than electric current in external circuit flow into the electric current of amplifier
Can often it ignore, the input terminal open circuit of this suitable amplifier, this characteristic is known as " void is disconnected ".Since operational amplifier Q1 exists
It the phenomenon that " void is disconnected ", connects so laser is equivalent to resistance R, the electric current I_LD of flowing through laser and the electricity for flowing through resistance R
Stream I_R thinks equal, i.e. I_LD=I_R.
By above-mentioned qualitative analysis available Va=Vb and I_LD=I_R.In qualitative analysis, I_R=Vb/R, so
I_LD=Va/R, i.e., directly proportional in Va by the electric current of laser, Va changes the variation for causing I_LD, and the variation of electric current leads to light
The variation of signal, to realize Electro-optical Modulation.
Optionally, since the voltage of external signal is limited, according to I_LD=Va/R, the resistance value of resistance can also be adjusted, it is real
Now to the control of electric current.Resistance R can also be variable resistance as a result, by adjusting the resistance of variable resistance, can control electricity
The value for flowing I_LD, to realize the hardware protection of laser.Wherein, the value of resistance R and the inversely proportional relationship of electric current, as resistance R
Resistance value when becoming larger, then electric current becomes smaller, and when the resistance value of resistance R becomes smaller, then electric current becomes larger.A kind of possible implementation, should
Variable resistance is digital variable resistance.
Further, the inverting input terminal of the output end of laser 30 provided in this embodiment and operational amplifier Q1 connect
It connects, so that operational amplifier Q1 and laser 30 form negative-feedback circuit.Since the amplification factor of operational amplifier is infinite
Greatly, so operational amplifier cannot be used directly to do amplifier use, due to inverting input terminal with the voltage of output be it is opposite,
It is a negative-feedback circuit so the amplification factor of circuit can be reduced.
" empty short " and " void disconnected " phenomenon of the present embodiment using operational amplifier Q1, realize through modulation voltage
Modulation electric current is provided to laser, avoiding directly causes electric current too small laser connection modulation voltage, can not drive laser
The problem of device.
Below with reference to Fig. 4 and Fig. 5, the structure of power output circuit provided in this embodiment is described in detail.
Fig. 4 is the structural schematic diagram three of laser driving circuit provided in an embodiment of the present invention, as described in Figure 4, this implementation
The voltage follower circuit that example provides includes external power supply 11.The laser driving circuit includes: external power supply 11, operational amplifier
Q1, resistance R and laser 30.
Wherein, external power supply 11 is connect with the non-inverting input terminal a of operational amplifier Q1, the anti-phase input of operational amplifier Q1
End b is connect with the output end of one end of resistance R and laser 30 respectively, and the output end of operational amplifier Q1 is defeated with laser 30
Enter end connection.
The external power supply 11 can export modulation voltage, and similarly, which can be digital voltage or analog voltage.
Specifically, which can export modulation voltage under the control of itself program or under the control of other equipment,
The implementation that the present embodiment exports variation voltage to external power supply 11 is not particularly limited.
Laser driving circuit provided in this embodiment exports modulation voltage by external power supply 11, simplifies laser
The structure of driving circuit, it is easy to accomplish.
Fig. 5 is the structural schematic diagram four of laser driving circuit provided in an embodiment of the present invention.As shown in figure 5, voltage is defeated
Circuit 10 includes micro-control unit 12 out；Optionally, voltage follower circuit 10 further includes processor 13.As shown in figure 5, the laser
Device driving circuit include: processor 13, micro-control unit (Microcontroller Unit, MCU) 12, operational amplifier Q1,
Laser 30 and resistance R.
Wherein, micro-control unit 12 is connect with the non-inverting input terminal a of processor 13 and operational amplifier Q1 respectively, and operation is put
The inverting input terminal b of big device Q1 is connect with the output end of one end of resistance R and laser 30 respectively, the output of operational amplifier Q1
End is connect with the input terminal of laser 30.
During specific implementation, which can export modulation voltage according to modulation program.The modulation journey
Sequence can be pre-written into micro-control unit 12.The modulation program can be used for generating digital voltage.
Optionally, also digital analog converter can be set in the micro-control unit 12, it will by the digital analog converter
Modulation program is converted to analog voltage, and thus micro-control unit 12 can export analog voltage to operational amplifier Q1.
Optionally, pre-set modulation program can be sent to microcontroller list for processor 13 in the micro-control unit 12
Member 12.The corresponding optical module comprising the laser driving circuit can be used as fixed light source come using.
It will be understood by those skilled in the art that modulation journey can be sent to micro-control unit 12 in real time with processor 13
Sequence realizes modulated in real time.
Illustratively, processor 13 is connect with micro-control unit 12 by IC bus IIC.
Laser driving circuit provided in this embodiment exports modulation voltage according to modulation program by micro-control unit,
So that the Electro-optical Modulation of laser is easily controllable.
Fig. 6 is the schematic diagram of Electro-optical Modulation provided in an embodiment of the present invention.As shown in fig. 6, modulation voltage is sinusoidal voltage,
Amplitude represents voltage swing.The optical signal of corresponding output is sinusoidal optical signal, and amplitude represents the luminous intensity of optical signal.It can by Fig. 6
Know, luminous intensity is directly proportional to voltage swing, while sinusoidal voltage is similar to sinusoidal photosignal waveform, that is, illustrates modulation voltage to light
Signal plays good modulating action.
The embodiment of the present invention also provides a kind of optical module, which includes driving circuit shown in Fig. 2 to Fig. 5 as above.
It should be noted that above each resistance R, operational amplifier Q1 can be real for the combination of one or more devices
Existing, i.e., above-mentioned resistance R may include at least one resistance, when containing at least two resistance, can be in parallel, series connection or
In series and parallel.Operational amplifier Q1 may include the devices such as multiple triodes, diode, and the present embodiment is not particularly limited herein.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot
Structure, material or feature are contained at least one embodiment or example of the application.In the present specification, to above-mentioned term
Schematic representation may not refer to the same embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can be combined in any suitable manner in any one or more of the embodiments or examples.
Term " includes " and "comprising", there are also it to derive statement, mean without restriction include.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of laser driving circuit characterized by comprising voltage follower circuit, negative-feedback circuit and laser；Its
In
The negative-feedback circuit is connect with the voltage follower circuit and the laser respectively；
The voltage follower circuit be used for the negative-feedback circuit export modulation voltage, the modulation voltage be digital voltage or
Analog voltage；
The negative-feedback circuit is used to provide modulation electric current to the laser, and receives the negative-feedback letter of the laser output
Number；
The laser is used to shine under the action of the modulation electric current.
2. circuit according to claim 1, which is characterized in that the negative-feedback circuit includes operational amplifier and resistance；
Wherein
The non-inverting input terminal of the operational amplifier is connect with the voltage follower circuit；
The inverting input terminal of the operational amplifier is connect with one end of the resistance, the other end ground connection of the resistance；
The output end of the operational amplifier is connect with the input terminal of the laser, the output end of the laser also with it is described
One end of resistance connects.
3. circuit according to claim 2, which is characterized in that the voltage follower circuit includes external power supply；Wherein
One end of the external power supply is connect with the non-inverting input terminal of the operational amplifier.
4. circuit according to claim 2, which is characterized in that the voltage follower circuit includes micro-control unit；Wherein
The micro-control unit is connect with the non-inverting input terminal of the operational amplifier；
The micro-control unit is used to export modulation voltage according to modulation program.
5. circuit according to claim 4, which is characterized in that the voltage follower circuit further includes processor；
The micro-control unit is also connected to the processor；
The processor is used to send modulation program to the micro-control unit.
6. circuit according to claim 4, which is characterized in that the micro-control unit includes digital analog converter；
The digital analog converter is used to the modulation program being converted to analog voltage.
7. circuit according to claim 5, which is characterized in that the processor and the micro-control unit pass through integrated electricity
Road bus IIC connection.
8. circuit according to claim 2, which is characterized in that the resistance is variable resistance.
9. circuit according to claim 8, which is characterized in that the variable resistance is digital variable resistance.
10. a kind of optical module, which is characterized in that including the described in any item driving circuits of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811356600.6A CN109244826A (en) | 2018-11-15 | 2018-11-15 | Laser driving circuit and optical module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811356600.6A CN109244826A (en) | 2018-11-15 | 2018-11-15 | Laser driving circuit and optical module |
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| CN109244826A true CN109244826A (en) | 2019-01-18 |
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ID=65075174
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111726163A (en) * | 2020-05-26 | 2020-09-29 | 北京航天时代光电科技有限公司 | Four-working-point adjustable external modulation electro-optical conversion system and method |
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|---|---|---|---|---|
| JPH10145305A (en) * | 1996-11-06 | 1998-05-29 | Mitsubishi Electric Corp | Optical transmitter |
| CN103067076A (en) * | 2012-12-27 | 2013-04-24 | 武汉华工正源光子技术有限公司 | Detection circuit of optical module burst luminous power |
| CN204835207U (en) * | 2015-08-13 | 2015-12-02 | 王莹 | Semiconductor laser power modulation drive circuit |
-
2018
- 2018-11-15 CN CN201811356600.6A patent/CN109244826A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10145305A (en) * | 1996-11-06 | 1998-05-29 | Mitsubishi Electric Corp | Optical transmitter |
| CN103067076A (en) * | 2012-12-27 | 2013-04-24 | 武汉华工正源光子技术有限公司 | Detection circuit of optical module burst luminous power |
| CN204835207U (en) * | 2015-08-13 | 2015-12-02 | 王莹 | Semiconductor laser power modulation drive circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111726163A (en) * | 2020-05-26 | 2020-09-29 | 北京航天时代光电科技有限公司 | Four-working-point adjustable external modulation electro-optical conversion system and method |
| CN111726163B (en) * | 2020-05-26 | 2022-03-04 | 北京航天时代光电科技有限公司 | Four-working-point adjustable external modulation electro-optical conversion system and method |
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