CN107689833A - A kind of apparatus and method of VOA power limitation controls - Google Patents
A kind of apparatus and method of VOA power limitation controls Download PDFInfo
- Publication number
- CN107689833A CN107689833A CN201710908791.1A CN201710908791A CN107689833A CN 107689833 A CN107689833 A CN 107689833A CN 201710908791 A CN201710908791 A CN 201710908791A CN 107689833 A CN107689833 A CN 107689833A
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- voa
- power
- voltage
- pmosfet
- difference
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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
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to a kind of output control device and method, belong to technical field of photo communication, be specifically related to a kind of apparatus and method of VOA power limitation controls.Including：PMOSFET is managed, and its source S connects power supply, and its drain D is connected with VOA input；Multiplier, it inputs the differential amplifier circuit for being connected to detect VOA both end voltages respectively and the current sampling resistor that VOA current signals are flowed through for detecting, and it exports connection voltage calibration circuit；Integrating circuit, be connected with PMOSFET pipes, for obtaining the difference of VOA actual powers that voltage calibration circuit inputs and default reference power, and the difference delivered to the base stage of PMOSFET pipes.Therefore, the invention has the advantages that：All realized using hardware circuit, control speed is fast, and precision is high, can effectively meet the requirement of telecommunication transmission net.
Description
Technical field
The present invention relates to a kind of output control device and method, belong to technical field of photo communication, be specifically related to a kind of VOA
The apparatus and method of power limitation control.
Background technology
VOA (adjustable optical attenuator) has a wide range of applications in optical communications, and its major function is for reducing or controlling
Optical signal.The most basic characteristic of optical-fiber network should be that luminous power is adjustable, lead in particular with DWDM Transmission systems and EDFA in light
Application in letter, gain flattening or channel power equalization must be carried out on multiple optical signal transmission passages, in optical receiver
End will carry out dynamic power control, also also need to be controlled other optical signals in optical-fiber network, these all cause VOA to turn into it
In indispensable Primary Component.
VOA is voltage control device, similar thermistor itself.Apply a voltage at VOA both ends, VOA will basis
Characteristic curve, produce different pad values.VOA has two kinds of characteristic curves：Voltage attenuation characteristic curve and power attenuation characteristic are bent
Line.Both characteristic curves correspond to different control methods respectively：Constant voltage controls and power limitation control.Constant voltage controls：Pin
To some pad value, external control circuit applies a fixed voltage to VOA.Power limitation control：For some decay
Value, external control circuit preset a fixed performance number, and the performance number is equal to VOA both end voltages U and passes through VOA electric currents I's
Product.Constant voltage controls and the difference of power limitation control is：VOA under the occasion that temperature change is larger, constant voltage control
Pad value changes greatly, and the VOA attenuation value changes very little under power limitation control.Less field is required to VOA attenuation value changes
Close, it is necessary to use power limitation control.The present invention provides a kind of VOA constant-power control method.
The content of the invention
The present invention mainly solves the above-mentioned technical problem present in prior art, there is provided a kind of VOA invariable powers control
The apparatus and method of system.Device and method control speed is fast, and precision is high, can effectively meet the requirement of telecommunication transmission net.
The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals：
A kind of device of VOA power limitation controls, including：
PMOSFET is managed, and its source S connects power supply, and its drain D is connected with VOA input；
Multiplier, its input are connected to detect the differential amplifier circuit of VOA both end voltages and for detection stream respectively
Current sampling resistor through VOA current signals, it exports connection voltage calibration circuit；
Integrating circuit, it is connected with PMOSFET pipes, for obtaining the VOA actual powers of voltage calibration circuit input and presetting
Reference power difference, and the difference is delivered to the base stage of PMOSFET pipes.
Preferably, the device of above-mentioned a kind of VOA power limitation controls, including：The differential amplifier circuit sets the two of VOA
End, the current sampling resistor connect the input of multiplier by voltage amplifier circuit.
Preferably, the device of above-mentioned a kind of VOA power limitation controls, the multiplier are analog multiplier.
Preferably, a kind of device of above-mentioned VOA power limitation controls, the reference power value are connected to power supply by one
Adjustable potentiometer obtains.
A kind of VOA constant-power control methods, including：
Power measurement step, VOA both end voltages value and its current value for being obtained according to measurement are calculated VOA's
Actual power；
Power comparison step, for the actual power and the difference of default reference power；
Feedback adjustment step, for by voltage corresponding to the difference deliver to its source S and drain D connect respectively power supply and
The base stage of the PMOSFET pipes of VOA inputs.
Preferably, above-mentioned a kind of VOA constant-power control methods, including：When the temperature increases, VOA itself resistance value
Diminish, the voltage signal U at VOA both ends diminishes, and actual power diminishes, and voltage corresponding to the difference diminishes, PMOSFET base stage
Voltage between G and source S becomes big, then becomes big by VOA electric current I, so as to cause the voltage signal U at VOA both ends and pass through
VOA current signal I becomes big.
Preferably, above-mentioned a kind of VOA constant-power control methods, including：When the temperature increases, when the temperature decreases, VOA
The resistance value of itself becomes big, and the voltage signal at VOA both ends becomes big, and measured power becomes big, and voltage corresponding to the difference becomes big,
Voltage between PMOSFET base stage G and source S diminishes, then is diminished by VOA electric current I, so as to cause the electricity at VOA both ends
Press signal U and diminished by VOA current signal I.
Therefore, the invention has the advantages that：All realized using hardware circuit, control speed is fast, and precision is high, can be effective
Meet the requirement of telecommunication transmission net.
Brief description of the drawings
Accompanying drawing 1 is a kind of schematic diagram of the present invention；
Embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment：
Technical scheme is as follows：Using the voltage signal U at differential amplifier circuit detection VOA both ends, electric current is utilized
Sample resistance and voltage amplifier circuit detect the current signal by VOA, wherein, the current value that voltage amplifier circuit will detect
Be converted to size of current numerically equal magnitude of voltage, be designated as voltage I herein.U and I enters analog multiplier and carries out multiplication fortune
Calculate, the output signal P0 of analog multiplier is U and I product, i.e. P0=U × I.Analog multiplier can take various forms,
In the present embodiment, the reality output of analog multiplier 109 is voltage signal, and the voltage signal is numerically equal to voltage amplification electricity
The product of the output voltage of road 106 and the output voltage of differential amplifier circuit 105.The voltage signal symbol that analog multiplier 109 exports
Number P0 is represented
The output of analog multiplier connects voltage calibration circuit, and the output that voltage calibration circuit is used to compensate analog multiplier is lost
Very.The output signal P1 of voltage calibration circuit connects integrating circuit.Adjustable potentiometer connects power supply, passes through adjustable potentiometer setting pair
The performance number P2, P2 of a certain attenuation is answered also to connect integrating circuit.
P2 is actually also a magnitude of voltage, is numerically equal to performance number corresponding to the attenuation for the VOA for needing to set.
The performance number is represented with symbol P2
Whole circuit adjust automatically U and I, so that P1 numerically very close P2, to ensure no matter at any
Under part, the output (i.e. the G poles of PMOSFET) of integrating circuit is constantly present certain voltage, and the voltage causes PMOSFET to turn on,
Finally VOA is caused to be maintained at pad value corresponding to P2.
Whole circuit adjust automatically U and I process are as follows：When the temperature increases, VOA itself resistance value diminishes, VOA two
The voltage signal U at end diminishes, and P1 diminishes, and the output of integrating circuit diminishes, and the voltage between PMOSFET GS becomes big, then passes through
VOA electric current I becomes big, and so as to cause the voltage signal U at VOA both ends and become big by VOA current signal I, then P1 becomes big,
Until P1 is close to P2.
Conversely, when the temperature decreases, VOA itself resistance value becomes big, the voltage signal U at VOA both ends becomes big, and P1 becomes big,
The output of integrating circuit becomes big, and the voltage between PMOSFET GS diminishes, then is diminished by VOA electric current I, so as to cause VOA
The voltage signal U at both ends and being diminished by VOA current signal I, then P1 diminishes, until | P1-P2 |=△ P, △ P are constant.
Embodiment provided by the invention is as shown in Figure 1.Including following components：Power supply 101, P-channel
MOSFET 102, VOA 103, current sampling resistor 104, differential amplifier circuit 105, voltage amplifier circuit 106, adjustable potentiometer
107, integrating circuit 108, analog multiplier 109, voltage calibration circuit 110.
Power supply 101 provides voltage for whole circuit, can be that external dc electricity pressure is directly fed, can also pass through power supply core
Piece carries out voltage conversion.The present invention uses booster power chip, and 3.3V is boosted into 5V.PMOSFET source S connects power supply 101,
Drain D connects VOA 103 input, and grid G connects integrating circuit 108.VOA 103 output connects current sampling resistor 104.Difference is put
Big circuit 105 can be made up of operational amplifier, and it is the voltage difference for amplifying the both ends of VOA 103 that it, which is acted on, and by the voltage U after amplification
Make a gift to someone to analog multiplier 109.Current sampling resistor 104, can in the range of 1~10 ohm value.Voltage amplifier circuit 106 can
It is made up of operational amplifier, it is to amplify the voltage that current sampling resistor 104 exports that it, which is acted on, and the voltage I after amplification is sent into
To analog multiplier 109.Voltage U and I are made multiplying by analog multiplier 109, export U and I product.That is analog multiplier
109 output voltage P0=U × I.The output of analog multiplier 109 connects voltage calibration circuit 110, if P0<U × I, then by voltage school
Quasi- circuit 110 compensates to P0 so that output voltage P1=U × I of voltage calibration circuit 110.Power supply calibration circuit 110 is defeated
Go out the input that voltage P1 connects integrating circuit 108, the output voltage P2 of adjustable potentiometer 107 meets the another of integrating circuit 108
Individual input.P2 value is equal on the power decline curves of VOA 103, to the performance number of the attenuation in requisition for setting.Integrating circuit
The voltage difference of two-way input signal is converted into voltage signal by 108, for controlling PMOSFET G levels, so as to form closed-loop control
Circuit, to ensure under any temperature conditionss, | P1-P2 |=△ P, △ P are constant.So VOA attenuation change meeting very little, one
As within ± 0.5dB.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (7)
- A kind of 1. device of VOA power limitation controls, it is characterised in that including：PMOSFET is managed, and its source S connects power supply, and its drain D is connected with VOA input；Multiplier, it inputs the differential amplifier circuit for being connected to detect VOA both end voltages respectively and flows through VOA for detecting The current sampling resistor of current signal, it exports connection voltage calibration circuit；Integrating circuit, it is connected with PMOSFET pipes, for the VOA actual powers for obtaining voltage calibration circuit input and default ginseng The difference of power is examined, and the difference is delivered to the base stage of PMOSFET pipes.
- A kind of 2. device of VOA power limitation controls according to claim 1, it is characterised in that including：The differential amplification Circuit sets VOA both ends, and the current sampling resistor connects the input of multiplier by voltage amplifier circuit.
- 3. the device of a kind of VOA power limitation controls according to claim 1, it is characterised in that the multiplier is simulation Multiplier.
- 4. the device of a kind of VOA power limitation controls according to claim 1, it is characterised in that the reference power value is led to An adjustable potentiometer for being connected to power supply is crossed to obtain.
- A kind of 5. VOA constant-power control methods, it is characterised in that including：VOA reality is calculated in power measurement step, VOA both end voltages value and its current value for being obtained according to measurement Power；Power comparison step, for the actual power and the difference of default reference power；Feedback adjustment step, for voltage corresponding to the difference being delivered into its source S and drain D connects power supply and VOA respectively The base stage of the PMOSFET pipes of input.
- A kind of 6. VOA constant-power control methods according to claim 5, it is characterised in that including：When the temperature increases, VOA itself resistance value diminishes, and the voltage signal U at VOA both ends diminishes, and actual power diminishes, and voltage corresponding to the difference becomes Small, the voltage between PMOSFET base stage G and source S becomes big, then becomes big by VOA electric current I, so as to cause VOA both ends Voltage signal U and become big by VOA current signal I.
- A kind of 7. VOA constant-power control methods according to claim 5, it is characterised in that including：When the temperature increases, When the temperature decreases, VOA itself resistance value becomes big, and the voltage signal at VOA both ends becomes big, and measured power becomes big, the difference Corresponding voltage becomes big, and the voltage between PMOSFET base stage G and source S diminishes, then is diminished by VOA electric current I, so as to Cause the voltage signal U at VOA both ends and diminished by VOA current signal I.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710908791.1A CN107689833A (en) | 2017-09-29 | 2017-09-29 | A kind of apparatus and method of VOA power limitation controls |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710908791.1A CN107689833A (en) | 2017-09-29 | 2017-09-29 | A kind of apparatus and method of VOA power limitation controls |
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| CN107689833A true CN107689833A (en) | 2018-02-13 |
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| CN201710908791.1A Pending CN107689833A (en) | 2017-09-29 | 2017-09-29 | A kind of apparatus and method of VOA power limitation controls |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393777A (en) * | 2020-10-19 | 2021-02-23 | 重庆川仪自动化股份有限公司 | Constant-power thermal type gas mass flow meter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834573A (en) * | 2009-02-27 | 2010-09-15 | 雅马哈株式会社 | The D class A amplifier A |
| CN104125012A (en) * | 2014-07-31 | 2014-10-29 | 深圳市共进电子股份有限公司 | Method and system for testing high-speed optical module |
-
2017
- 2017-09-29 CN CN201710908791.1A patent/CN107689833A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834573A (en) * | 2009-02-27 | 2010-09-15 | 雅马哈株式会社 | The D class A amplifier A |
| CN104125012A (en) * | 2014-07-31 | 2014-10-29 | 深圳市共进电子股份有限公司 | Method and system for testing high-speed optical module |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393777A (en) * | 2020-10-19 | 2021-02-23 | 重庆川仪自动化股份有限公司 | Constant-power thermal type gas mass flow meter |
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| CB03 | Change of inventor or designer information |
Inventor after: Yang Junqi Inventor after: Chen Honggang Inventor after: Zhang Bo Inventor after: Hu Yi Inventor before: Hu Yi Inventor before: Zhang Bo Inventor before: Chen Honggang |
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Application publication date: 20180213 |
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