CN205724365U - A kind of automatic optical power control circuit - Google Patents
A kind of automatic optical power control circuit Download PDFInfo
- Publication number
- CN205724365U CN205724365U CN201620308611.7U CN201620308611U CN205724365U CN 205724365 U CN205724365 U CN 205724365U CN 201620308611 U CN201620308611 U CN 201620308611U CN 205724365 U CN205724365 U CN 205724365U
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- circuit
- control circuit
- input
- optical power
- negative feedback
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Abstract
This utility model provides automatic optical power control circuit, and including input circuit, negative feedback control circuit and reference circuit, wherein, this input circuit electrically connects with negative feedback control circuit, this negative feedback control circuit and reference circuit electrical connection；This input circuit includes difference channel and LD laser instrument, this negative feedback control circuit includes PIN photodiode, amplifying circuit and compares amplifying circuit, this reference circuit includes comparing amplifying circuit, DC reference input and information reference input, the Automatic optical power control of LD laser instrument can be realized, decrease the luminous power of output of semiconductor laser by variations in temperature and component influences own.
Description
Technical field
This utility model relates to control circuit field, especially a kind of automatic optical power control circuit.
Background technology
The generally effect of automatic optical power control circuit (Automatic Power Control, referred to as APC) circuit is, surely
Determine LD Output optical power so that it is do not raise with temperature and the use time increases and changes.Affect LD Output optical power instability
Because have: 1. temperature raises, then Ith increases, and P-I slope of curve Δ P/ Δ I reduces, and makes Output optical power reduce, even stops
Only launch laser；2. use the time to increase, then Ith also increases, and Δ P/ Δ I reduces, and makes Output optical power reduce.Quasiconductor swashs
The luminous power of the output of light device has substantial connection with variations in temperature and the aging of device own, in correlation technique, does not ensures that sharp
Light device has stable output.
Utility model content
The technical problems to be solved in the utility model there is provided a kind of automatic optical power control circuit, it is ensured that laser instrument has stable
Output.
This utility model provides a kind of automatic optical power control circuit, including: input circuit, negative feedback control circuit and reference
Circuit, wherein, this input circuit electrically connects with negative feedback control circuit, this negative feedback control circuit and reference circuit electrical connection；
This input circuit includes difference channel and LD laser instrument, this negative feedback control circuit include PIN photodiode, amplifying circuit and
Relatively amplifying circuit, this reference circuit includes comparing amplifying circuit, DC reference input and information reference input, wherein,
Described negative feedback control circuit also includes that difference channel DT3, the described amplifying circuit A3 and described difference channel DT3 that compares are constituted
Constant-current source provides to described LD laser instrument and adjusts biasing circuit.
Further, this input circuit includes difference channel DT1 and DT2, and this difference channel DT1 and DT2 is double-width grinding
Digital signal.
Further, this PIN photodiode, for receiving the Output optical power dorsad of this LD laser instrument, and be converted to telecommunications
Number.
Further, this amplifying circuit compares amplifying circuit respectively amplifier A1 with this and compares amplifying circuit A3, this A1
Electrically connect with this A3.
Further, the DC reference input terminal voltage that this reference circuit includes is 24V.
Further, the information reference input that this reference circuit includes is for preventing from controlling without input signal or long even " 0 " code
Time, bias current automatically rises and causes error code.
Further, this negative feedback control circuit also includes difference channel DT3, and this compares amplifying circuit A3 and this difference channel
DT3 constitutes constant-current source provides adjustment biasing circuit to this LD laser instrument.
By this utility model, use automatic optical power control circuit, including input circuit, negative feedback control circuit and reference electricity
Road, wherein, this input circuit electrically connects with negative feedback control circuit, this negative feedback control circuit and reference circuit electrical connection；Should
Input circuit includes difference channel and LD laser instrument, and this negative feedback control circuit includes PIN photodiode, amplifying circuit and ratio
Relatively amplifying circuit, this reference circuit includes comparing amplifying circuit, DC reference input and information reference input, can realize LD
The Automatic optical power control of laser instrument, decreases the luminous power of output of semiconductor laser by variations in temperature and component influences own.
Accompanying drawing explanation
Fig. 1 is the schematic diagram according to automatic optical power control circuit of the present utility model；
Fig. 2 is the schematic diagram according to operational amplifier chip OPA657 of the present utility model；
Fig. 3 is the schematic diagram according to comparison amplifier chip TLV3501 of the present utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawings, content of the present utility model is further described in detail.
The luminous power of the output of semiconductor laser has substantial connection with variations in temperature and the aging of device own, therefore for ensureing to swash
Light device has stable output, it should have luminous power automatic control circuit.Luminous power has automatically controlled many methods, this circuit
Use automatic bias control methods, be automatically to adjust bias current by light feedback to reach the control of luminous power.So-called automatic bias control
Preparation method, it is simply that utilize the PIN photodiode in laser assembly, monitors the size of laser instrument Output optical power dorsad, if light
When power is less than a certain rated value, makes driving electric current increase by feedback circuit, and reach normal light performance number, otherwise, if light
When power is more than a certain rated value, driving electric current is made to reduce by feedback circuit, to ensure that laser output power constant is constant.
Fig. 1 is the schematic diagram according to automatic optical power control circuit of the present utility model, as it is shown in figure 1, include input circuit,
Negative feedback control circuit and reference circuit, wherein, this input circuit electrically connects with negative feedback control circuit, this negative feedback control electricity
Road and reference circuit electrical connection；This input circuit includes difference channel and LD laser instrument, and this negative feedback control circuit includes PIN light
Electric diode, amplifying circuit and compare amplifying circuit, this reference circuit includes comparing amplifying circuit, DC reference input and letter
Breath reference input, wherein, DT1 and DT2 is difference channel, and it is double-width grinding digital signal.LD laser instrument, be by
DT1 and DT2 difference channel outfan drives, and sends optical signal.PIN is photodiode, receives LD laser instrument dorsad
Output optical power, and be converted to the signal of telecommunication (photovoltage).A1 is amplifier, is the signal of telecommunication (photovoltage) amplifying PIN conversion.
A2, A3 are for comparing amplifying circuit.A3 and DT3 constitutes constant-current source provides adjustment biasing circuit to laser instrument.V be 12 volts straight
Stream power supply.DC reference voltage is D.C. regulated power supply 24 volts, and regulator potentiometer can change DC reference voltage and realize artificial tune
Joint bias current.Signal is with reference to being exactly input signal, and effect prevents from controlling when without input signal or long even " 0 " code exactly, and bias current is automatic
Rise and cause error code.
Circuitry work process: make laser instrument LD Output optical power increase → PIN be converted to the signal of telecommunication (light for a certain reason
Voltage) increase → amplify output → A3 through A1 and compare the inverting input of amplifying circuit.
On the other hand, input signal and the DC reference voltage taken out from D.C. regulated power supply compare amplifying circuit output by A2
(being substantially a definite value) → A3 compares the in-phase input end of amplifying circuit.
Result is the bias current minimizing that A3 compares amplifying circuit output reduction → DT3 output electric current minimizing → Ib minimizing → LD
The Output optical power of → LD reduces.Make for a certain reason the principle of the regulation process that laser instrument LD Output optical power reduces with by
In certain reason make that laser instrument LD Output optical power increases similar, do not repeat them here.
Select to be described briefly below for device.
1) DT1, DT2, DT3 audion selects model to be BFR340F.
In view of in optical communication system for two-forty and the requirement of low error rate, therefore the audion in circuit consider select high frequency
The model of low noise.And BFR340F feature is suitable for the high-frequency microwave low-noise amplifier of small area analysis.
2) LD type selecting: device threshold electric current is the smaller the better, LD is substantially all application GaAlAs and InGaP material, can cover
Covering whole optical fiber telecommunications system and use wave-length coverage, representative value is 0.85um, 1.31um, 1.55um.So the selection of LD is wanted
Select according to optical communication system wavelength.
3) PIN photodiode type selecting: there is in system wavelength enough responsivenesses, i.e. to certain incident power, it is possible to
Export the biggest photoelectric current；There is sufficiently fast response speed, it is possible to be applicable at a high speed or bandwidth system；Have as far as possible
Low noise, to reduce the device impact on signal itself；There is good linear relationship, to ensure in signal conversion process
Undistorted；There is less volume, longer life-span etc..The model selected can be 2CU2025.
4) A1 type selecting: Fig. 2 is the schematic diagram according to operational amplifier chip OPA657 of the present utility model, as in figure 2 it is shown,
Selecting OPA657 high-performance low-noise operational amplifier, 2 terminals are reversed input terminals, and 3 terminals are in-phase input terminals, 6
Terminal is lead-out terminal.
5) TLV3501 high-performance high speed comparison amplifier selected by A2, A3 comparator.Fig. 3 is according to ratio of the present utility model
The relatively schematic diagram of amplifier chip TLV3501, as it is shown on figure 3,2 terminals of chip are reversed input terminals, 3 terminals are same
Phase input terminal, 6 terminals are lead-out terminals.
The beneficial effects of the utility model are, by conventional difference channel and amplifying circuit, can realize the automatic light of LD laser instrument
Power controls, and decreases the luminous power of output of semiconductor laser by variations in temperature and component influences own.
More than should be only preferred embodiment of the present utility model, be not limited to this utility model, for the skill of this area
For art personnel, this utility model can have various modifications and variations.All within spirit of the present utility model and principle, made
Any modification, equivalent substitution and improvement etc., within protection domain of the present utility model all should be included in.
Claims (6)
1. an automatic optical power control circuit, it is characterised in that including: input circuit, negative feedback control circuit and reference circuit,
Wherein, described input circuit electrically connects with negative feedback control circuit, described negative feedback control circuit and reference circuit electrical connection；
Described input circuit includes difference channel and LD laser instrument, and described negative feedback control circuit includes PIN photodiode, puts
Big circuit and compare amplifying circuit, described reference circuit includes comparing amplifying circuit, DC reference input and information reference
Input, wherein, described negative feedback control circuit also includes difference channel DT3, the described amplifying circuit A3 and described of comparing
Difference channel DT3 constitutes constant-current source provides adjustment biasing circuit to described LD laser instrument.
Automatic optical power control circuit the most according to claim 1, it is characterised in that described input circuit includes difference channel
DT1 and DT2, described difference channel DT1 and DT2 are double-width grinding digital signal.
Automatic optical power control circuit the most according to claim 1, it is characterised in that described PIN photodiode, is used for
Receive the Output optical power dorsad of described LD laser instrument, and be converted to the signal of telecommunication.
Automatic optical power control circuit the most according to claim 1, it is characterised in that described amplifying circuit and described comparison put
Big circuit respectively amplifier A1 and compare amplifying circuit A3, described A1 and electrically connect with described A3.
Automatic optical power control circuit the most according to claim 1, it is characterised in that the DC reference that described reference circuit includes
Input terminal voltage is 24V.
Automatic optical power control circuit the most according to claim 1, it is characterised in that the information ginseng that described reference circuit includes
Examining input for preventing from controlling when without input signal or long even " 0 " code, bias current automatically rises and causes error code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620308611.7U CN205724365U (en) | 2016-04-13 | 2016-04-13 | A kind of automatic optical power control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620308611.7U CN205724365U (en) | 2016-04-13 | 2016-04-13 | A kind of automatic optical power control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205724365U true CN205724365U (en) | 2016-11-23 |
Family
ID=57308469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620308611.7U Expired - Fee Related CN205724365U (en) | 2016-04-13 | 2016-04-13 | A kind of automatic optical power control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205724365U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802750A (en) * | 2018-06-15 | 2018-11-13 | 枣阳市米朗科技有限公司 | A kind of modulation drive circuit for laser ranging |
| CN110195843A (en) * | 2018-02-27 | 2019-09-03 | 法雷奥照明公司 | The lamp module for motor vehicles including multiple light sources branch |
| CN110571645A (en) * | 2019-10-09 | 2019-12-13 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | Laser power attenuation compensation circuit of image scanning device |
-
2016
- 2016-04-13 CN CN201620308611.7U patent/CN205724365U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195843A (en) * | 2018-02-27 | 2019-09-03 | 法雷奥照明公司 | The lamp module for motor vehicles including multiple light sources branch |
| CN108802750A (en) * | 2018-06-15 | 2018-11-13 | 枣阳市米朗科技有限公司 | A kind of modulation drive circuit for laser ranging |
| CN108802750B (en) * | 2018-06-15 | 2023-12-26 | 湖北米朗科技股份有限公司 | Modulation driving circuit for laser ranging |
| CN110571645A (en) * | 2019-10-09 | 2019-12-13 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | Laser power attenuation compensation circuit of image scanning device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 Termination date: 20170413 |