CN104009806B - Optical receiver sensitivity adjusting device - Google Patents
Optical receiver sensitivity adjusting device Download PDFInfo
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- CN104009806B CN104009806B CN201410192819.2A CN201410192819A CN104009806B CN 104009806 B CN104009806 B CN 104009806B CN 201410192819 A CN201410192819 A CN 201410192819A CN 104009806 B CN104009806 B CN 104009806B
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Abstract
The embodiment of the invention provides an optical receiver sensitivity adjusting device, and relates to the technical field of optical communication. The optical receiver sensitivity adjusting device is used for adjusting the bias voltage of the input end of a limiting amplifier in an optical receiver to improve the sensitivity of the limiting amplifier and the receiving sensitivity of the optical receiver. The optical receiver sensitivity adjusting device comprises a detecting controller, an adjustor and the limiting amplifier. The input end of the detecting controller is connected with the output end of the limiting amplifier and used for acquiring the bias voltage of the output end of the limiting amplifier. The output end of the detecting controller is connected with the input end of the adjustor, and the adjustor is used for receiving the bias voltage, generating adjusting voltage according to the bias voltage and outputting the adjusting voltage to one input end of the limiting amplifier.
Description
Technical field
The present invention relates to technical field of photo communication, particularly relate to the tune of a kind of optical receiver sensitivity
Engagement positions.
Background technology
Photoreceiver is widely used in the communications industry, is a kind of equipment receiving optical signal.
As it is shown in figure 1, photoreceiver specifically include that photodetector unit 10, preamplifier 20,
Limiting amplifier 30 and rear class processing unit 40, wherein, photodetector unit 10 will be for connecing
The optical signal received is changed into current signal, and preamplifier 20 is for being changed into current signal
The voltage signal amplified, limiting amplifier 30 is for carrying out limited range enlargement by the voltage signal of amplification
Output, processes for rear class processing unit 40.Wherein, the sensitivity of photoreceiver is weighing apparatus
One important indicator of amount photoreceiver performance.
It is analyzed from the composition of the photoreceiver shown in Fig. 1 and considers, affecting light-receiving clever
One of key factor of sensitivity is the sensitivity of limiting amplifier 30.Wherein, limiting amplifier 30
Input be Differential Input, in difference channel structure, ideally two inputs
Electrostatic bias voltage is duplicate, then, the difference of two input electrostatic bias voltages,
I.e. bias voltage (offset) is 0V, so most beneficial for the amplification of differential signal, judgement and
Recover, but it practice, the bias voltage of limiting amplifier 30 is generally not zero, have
Deviation, so that the sensitivity of limiting amplifier 30 is affected, and then has influence on whole light
The receiving sensitivity of receiver.
Summary of the invention
Embodiments of the invention provide the adjusting apparatus of a kind of optical receiver sensitivity, by adjusting
The bias voltage of limiting amplifier input in photoreceiver, improves the sensitive of limiting amplifier
Degree, and then improve the receiving sensitivity of photoreceiver.
For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that
Embodiments provide the adjusting apparatus of a kind of optical receiver sensitivity, including: inspection
Survey controller, actuator and limiting amplifier；
The input of described detection controller is connected with the outfan of described limiting amplifier, is used for
Obtain the bias voltage of described limiting amplifier outfan, the outfan of described detection controller with
The input of described actuator connects, and described actuator is used for receiving described bias voltage, and root
Generate regulation voltage according to described bias voltage, export described regulation voltage to described limiting amplifier
An input.
Optionally, described detection controller includes: the first microcontroller；
First analog digital conversion pin of described first microcontroller and the second analog digital conversion pin are respectively
It is connected with two outfans of described limiting amplifier, is used for obtaining the output of described limiting amplifier
The bias voltage of end, sends described bias voltage to described actuator.
Optionally, described actuator includes: the second microcontroller, regulation unit；
Described second microcontroller is connected with described detection controller, is used for receiving described detection control
The bias voltage that device processed sends, and generate regulation signal according to described bias voltage, by a number
Mould switched pins is sent to described regulation unit；Described regulation unit is for described regulation signal
It is filtered voltage adjusted with voltage division processing, described regulation voltage is sent to described amplitude limit
One input of amplifier.
Optionally, described regulation unit includes: capacitor cell and resistance pressure-dividing network；
First end of described resistance pressure-dividing network and the digital-to-analogue conversion pin of described second microcontroller
Connecting, the second end is connected with the first end of described capacitor cell, the second end of described capacitor cell
It is connected to ground；Described resistance pressure-dividing network is for the regulation letter to described second microcontroller output
Number carry out voltage division processing.
Optionally, described resistance pressure-dividing network includes: the first resistance unit and the second resistance unit；
First end of described first resistance unit and the digital-to-analogue conversion pin of described second microcontroller
Connecting, the second end is connected with the first end of described second resistance unit, described second resistance unit
The first end be connected with the first end of described capacitor cell, the second end is connected to ground.
Optionally, the adjusting apparatus of described optical receiver sensitivity also includes: the 3rd resistance unit,
Described actuator is connected to an input of described limiting amplifier by described 3rd resistance unit
End.
Optionally, the adjusting apparatus of described optical receiver sensitivity also includes: the 4th resistance unit
With the 5th resistance unit；
Described first end of the 4th resistance unit is connected with an outfan of described limiting amplifier,
Second end is connected to ground, and the first end of described 5th resistance unit is another with described limiting amplifier
One outfan connects, and the second end is connected to ground.
Optionally, described detection controller includes: the 3rd microcontroller and interface convertor；
First analog digital conversion pin of described 3rd microcontroller and the second analog digital conversion pin are respectively
It is connected with two outfans of described limiting amplifier, is used for obtaining the output of described limiting amplifier
The bias voltage of end；
Described interface convertor for being transferred to host computer by described bias voltage, and passes through described
Described second microcontroller is controlled by host computer.
Optionally, described 3rd microcontroller and described interface convertor are positioned on industrial control board.
Optionally, during described actuator is arranged at described photoreceiver.
Embodiments providing the adjusting apparatus of a kind of optical receiver sensitivity, this adjustment fills
Put and include: detection controller, actuator and limiting amplifier；Input by detection controller
It is connected with the outfan of limiting amplifier, to obtain the bias voltage of this limiting amplifier outfan,
Bias voltage according to outfan generates regulation signal, and this regulation signal is sent to actuator,
So that this actuator generates regulation voltage according to described regulation signal, and export described regulation electricity
Press to an input of described limiting amplifier, to regulate the biasing of limiting amplifier outfan
Voltage, until the bias voltage of limiting amplifier outfan reaches to expect required (level off to 0),
It is inferred that the bias voltage of limiting amplifier input is adjusted to expect required, improve
The sensitivity of limiting amplifier, and then improve the sensitivity of photoreceiver.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will to embodiment or
In description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art
From the point of view of, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
The structural representation of a kind of photoreceiver that Fig. 1 provides for prior art；
Showing of the adjusting apparatus of a kind of optical receiver sensitivity that Fig. 2 provides for the embodiment of the present invention
It is intended to；
The adjustment dress of a kind of concrete optical receiver sensitivity that Fig. 3 provides for the embodiment of the present invention
Put schematic diagram；
The adjustment of the optical receiver sensitivity that another kind that Fig. 4 provides for the embodiment of the present invention is concrete
Device schematic diagram；
The tune for the optical receiver sensitivity shown in Fig. 4 that Fig. 5 provides for the embodiment of the present invention
Engagement positions schematic diagram；
Fig. 6 is applied to photoreceiver medium sensitivity for the one that the embodiment of the present invention provides and adjusts dress
The schematic diagram put.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical side in the embodiment of the present invention
Case is clearly and completely described, it is clear that described embodiment is only the present invention one
Divide embodiment rather than whole embodiments.Based on the embodiment in the present invention, this area is general
The every other embodiment that logical technical staff is obtained under not making creative work premise,
Broadly fall into the scope of protection of the invention.
Embodiments provide the adjusting apparatus of a kind of optical receiver sensitivity, such as Fig. 2 institute
Show, including: detection controller 50, actuator 60 and limiting amplifier 30；
The input of described detection controller 50 and described limiting amplifier (Trans-impedance
Amplifiers, be called for short LA) 30 outfan connect, be used for obtaining described limiting amplifier 30
The bias voltage of outfan, the outfan of described detection controller 50 and described actuator 60
Input connects, and described actuator 60 is used for receiving described bias voltage, and according to described biasing
Voltage generates regulation voltage, exports described regulation voltage defeated to one of described limiting amplifier 30
Enter end.
By the adjusting apparatus of the optical receiver sensitivity shown in above-mentioned Fig. 2 to regulate limited range enlargement
The bias voltage of device outfan, until the bias voltage of limiting amplifier outfan reaches to expect institute
(level off to 0) needed, then may infer that the bias voltage of limiting amplifier input is adjusted to
Expect required, improve the sensitivity of limiting amplifier, and then improve the spirit of photoreceiver
Sensitivity.
Optionally, as it is shown on figure 3, described detection controller 50 includes: the first microcontroller 501；
(Micro-programmed Control Unit is called for short described first microcontroller 501
MCU, it is possible to be referred to as microprocessor, single-chip microcomputer) the first analog digital conversion pin (Analog to
Digital Converter, is called for short ADC1) and the second analog digital conversion pin (ADC2) is respectively
It is connected with two outfans of described limiting amplifier 30, is used for obtaining described limiting amplifier 30
The bias voltage of outfan, sends described bias voltage to described actuator 60.
Wherein, described first analog digital conversion pin ADC1 and described second analog digital conversion pin
Voltage difference between ADC2 is the bias voltage of two outfans of described limiting amplifier 30
(offset)。
As it is shown on figure 3, described actuator 60 includes: the second microcontroller 601, regulation unit
602；Wherein, described second microcontroller 601 is connected with described detection controller 50, is used for
Receive the bias voltage that described detection controller 50 sends, and generate tune according to described bias voltage
Joint signal, by a digital-to-analogue conversion pin (Digital to Analog Converter is called for short DAC)
It is sent to described regulation unit 602；Described regulation unit 602 is for carrying out described regulation signal
Filtering and the adjusted voltage of voltage division processing, be sent to described limited range enlargement by described regulation voltage
One input of device 30.
Further, as it is shown on figure 3, described regulation unit 602 includes: capacitor cell 603
With resistance pressure-dividing network 604；First end of described resistance pressure-dividing network 604 and described second micro-control
The digital-to-analogue conversion pin of device 601 processed connects, the second end and the first end of described capacitor cell 603
Connecting, the second end of described capacitor cell 603 is connected to ground；Described resistance pressure-dividing network 604
For the regulation signal of described second microcontroller output is carried out voltage division processing.
Wherein, as it is shown on figure 3, described resistance pressure-dividing network 604 includes: the first resistance unit
605 and second resistance unit 606；
First end of described first resistance unit 605 and the digital-to-analogue of described second microcontroller 601
Switched pins connects, and the second end is connected with the first end of described second resistance unit 606, described
First end of the second resistance unit 606 is connected with the first end of described capacitor cell 603, and second
End is connected to ground.
Concrete, by the first resistance unit 605 and the resistance of the second resistance unit 606 composition
Potential-divider network, the method using electric resistance partial pressure, the regulation letter that the second microcontroller 601 is produced
Number carry out dividing potential drop adjustment, to produce precision higher regulation voltage to limiting amplifier 30
The bias voltage adjustment of input is more accurate；Meanwhile, the first resistance unit 605 and electric capacity list
Unit 603 composition one RC filter circuit, for the regulation voltage adjusted through dividing potential drop is filtered,
To ensure stablizing of regulation voltage, increase interference free performance.
Example, it is assumed that the precision of described second microcontroller 601 is 12, use 2.5V
Reference voltage time, second microcontroller 601 produce regulation signal step-length can accomplish
0.6mV, by the first resistance unit 605 and electric resistance partial pressure of the second resistance unit 606, permissible
The regulation signal producing the second microcontroller 601 is adjusted so that the step of this regulation signal
Length diminishes, to produce precision higher minor adjustments voltage so that input limiting amplifier 30
The bias voltage adjustment of end is more accurate.
As it is shown on figure 3, the adjusting apparatus of described optical receiver sensitivity also includes: the 3rd resistance
Unit 607, described actuator 60 is connected to described amplitude limit by described 3rd resistance unit 607
One input of amplifier 30.
Wherein, the resistance of described 3rd resistance unit 607 is relatively big, is used for isolating described limit
The high speed signal of width amplifier 30 input, owing to inputting the signal of described limiting amplifier 30
For AC signal, if the resistance of described 3rd resistance unit 607 is less, meeting is because dividing
The AC signal that stream loss is useful, the resistance of the most described 3rd resistance unit 607 is bigger；
Meanwhile, the adjusting apparatus of the optical receiver sensitivity in the embodiment of the present invention is DC circuit unit,
When the resistance of described 3rd resistance unit 607 is bigger, it is possible to avoid DC circuit unit
Shunting, is lost useful AC signal, further, when described 3rd resistance unit 607
When resistance is bigger, it is possible to more stable adds the regulation voltage that described actuator 60 produces
It is downloaded to an input of described limiting amplifier 30.Therefore, described 3rd resistance unit 607 was both
Ensure that the loading of DC adjustment voltage, be avoided that again the AC signal that loss is useful.
As shown in Figure 3, described first microcontroller 501 and described second microcontroller 601
Connected by IC bus (Inter-Integrated Circuit is called for short IIC).
Further, as it is shown on figure 3, the adjusting apparatus of described optical receiver sensitivity also includes:
4th resistance unit 80 and the 5th resistance unit 90；
First end of described 4th resistance unit 80 and an outfan of described limiting amplifier 30
Connecting, the second end is connected to ground, and the first end of described 5th resistance unit 90 is put with described amplitude limit
Another outfan of big device 30 connects, and the second end is connected to ground；Wherein, the 4th resistance unit 80
With the output loading that the 5th resistance unit 90 is described limiting amplifier.
In the adjusting apparatus of the optical receiver sensitivity shown in Fig. 3, detection controller is by first
Microcontroller realizes, and this first microcontroller obtains amplitude limit by two analog digital conversion pins and puts
The bias voltage of big device outfan, is sent to described actuator, described regulation by this bias voltage
Device generates regulation voltage according to this bias voltage, exports described regulation voltage to described limited range enlargement
One outfan of device, to regulate the bias voltage of limiting amplifier outfan, until amplitude limit is put
The bias voltage of big device outfan reaches to expect required (level off to 0), then may infer that limit
The bias voltage of width amplifier in is adjusted to expect required, and wherein, actuator is by the
Two microcontrollers, capacitor cell and resistance pressure-dividing network realize, due to the second microcontroller
Limited precision, is not enough to accurately adjust limiting amplifier according to the regulation signal that bias voltage produces
The bias voltage of input, therefore carries out dividing potential drop tune by resistance pressure-dividing network to this regulation signal
Whole, to produce high-precision regulation voltage, and adjusted by the filtering of capacitor cell, it is ensured that adjust
Stablizing of economize on electricity pressure, increases interference free performance, improves the sensitivity of limiting amplifier, and then
Improve the sensitivity of photoreceiver.
As shown in Figure 4, described detection controller 50 may include that the 3rd microcontroller 502 He
Interface convertor 503；Wherein, the first analog digital conversion pin of described 3rd microcontroller 502
ADC1 and the second analog digital conversion pin ADC2 is defeated with two of described limiting amplifier 30 respectively
Go out end to connect, for obtaining the bias voltage of described limiting amplifier 30 outfan；
Described interface convertor 503 is for being transferred to host computer 504 by described bias voltage, and leads to
Cross described host computer 504 described second microcontroller 601 is controlled.
Wherein, described host computer 504 monitors the biasing of described limiting amplifier 30 outfan in real time
Voltage, is controlled described second microcontroller 601, micro-to control second by host computer
The regulation signal that controller generates is more accurate, and meanwhile, described host computer 504 can also have it
His purposes, described host computer 504 can connect data base, can adjust by recording parameters in data base
Joint information, in order to review, can carry out producing, the effect such as management and control and maintenance.
As shown in Figure 4, described second microcontroller 601 leads to described 3rd microcontroller 502
Crossing IIC to connect, described host computer 504 is by described interface convertor 503 and described second micro-control
Device the 601, the 3rd microcontroller 502 processed uses IIC to connect.Certainly, described interface convertor 503
Be arranged between described second microcontroller 601 and described 3rd microcontroller 502, described in connect
Mouth transducer 503 passes through IIC with described second microcontroller 601, described 3rd microcontroller 502
Connecting, described host computer 504 passes through described interface convertor 503 respectively at described second micro-control
Device 601 processed, described 3rd microcontroller 502 connect.
Example, the 3rd microcontroller 502 described in Fig. 4 can also replace with program control high-precision
Degree circuit tester or testing circuit, described host computer 504 can also be computer.Concrete, program control
High Precision Multimeter or testing circuit directly measure the bias voltage of LA outfan, and computer passes through
USB or serial ports turn IIC interface and read the bias voltage of LA outfan, and control and adjust to adjust
The regulation voltage that joint device produces, is input to an input of LA by this regulation voltage, to adjust
The bias voltage of LA input, improves the sensitivity of limiting amplifier, and then improves light and connect
The sensitivity of receipts machine.
Wherein, described 3rd microcontroller 502 and described interface convertor 503 may be located at work
On control plate.Actuator 60 described in Fig. 4 is identical with the actuator 60 shown in Fig. 3,
Specifically refer to the description to actuator in Fig. 3 60, do not repeat them here.
In the adjusting apparatus of the optical receiver sensitivity shown in Fig. 4, detection controller is by one the
Three microcontrollers and interface convertor realize jointly.The 3rd microcontroller now passes through two
Analog digital conversion pin obtains the bias voltage of limiting amplifier outfan, and host computer is turned by interface
Parallel operation obtains this bias voltage, and is controlled the second microcontroller according to this bias voltage,
Second microcontroller generates regulation voltage according to this bias voltage, exports described regulation voltage to institute
State an outfan of limiting amplifier, to regulate the bias voltage of limiting amplifier outfan,
Until the bias voltage of limiting amplifier outfan reaches to expect required (level off to 0), then
May infer that the bias voltage of limiting amplifier input is adjusted to expect required, wherein, adjust
Joint device is realized by the second microcontroller, capacitor cell and resistance pressure-dividing network, due to second
The limited precision of microcontroller, is not enough to accurately adjust according to the regulation signal that bias voltage produces
The bias voltage of limiting amplifier input, therefore by resistance pressure-dividing network to this regulation signal
Carry out dividing potential drop adjustment, to produce high-precision regulation voltage, and adjusted by the filtering of capacitor cell
Whole, it is ensured that stablizing of regulation voltage, increase interference free performance, improve the spirit of limiting amplifier
Sensitivity, and then improve the sensitivity of photoreceiver.
Example, illustrate as a example by the adjusting apparatus of the optical receiver sensitivity shown in Fig. 5,
Wherein, the capacitor cell 603 in described regulation unit 602 comprises an electric capacity C3, and described first
Resistance unit 605 comprises a resistance R6, and described second resistance unit 606 comprises a resistance R7,
Described 3rd resistance unit 607 comprises a resistance R3, and described 4th resistance unit 80 comprises an electricity
Resistance R4, described 5th resistance unit 90 comprises a resistance R5, microcontroller 1 and micro-control
Being connected by iic bus between device MCU2 processed, host computer turns IIC interface conversion by USB
Device is connected with described IIC.
Owing to the bias voltage of LA input is smaller, therefore it is difficult to accurately measure LA input
Bias voltage, it is impossible to simple readily the bias voltage of LA input is directly adjusted
And control.According to the operation principle of LA, the bias voltage of LA outfan is to LA input
Bias voltage through LA amplify after result, therefore can by detect LA outfan biasing
Voltage adjusts the bias voltage of LA input, when the bias voltage of LA outfan levels off to 0
Time, then may infer that the bias voltage of input has been adjusted to desired scope.
Concrete, the first digital-to-analogue conversion pin ADC1 and the second digital-to-analogue of microcontroller 1
Switched pins ADC2 is connected with two outfans of LA respectively, the of microcontroller 1
The voltage difference of one digital-to-analogue conversion pin ADC1 and the second digital-to-analogue conversion pin ADC2 is LA
The bias voltage of outfan, host computer monitors the bias voltage of LA outfan in real time, with to micro-control
The DAC output that device MCU2 processed is carried out is controlled, and microcontroller 2 is defeated according to this LA
The bias voltage going out end generates regulation signal, and is exported by a digital-to-analogue conversion pin, resistance R6
With resistance R7, this regulation signal is carried out dividing potential drop adjustment, and by electric capacity C3, this dividing potential drop is adjusted
After regulation signal be filtered process, adjusted voltage, this regulation voltage pass through resistance R3
Act on an input of described limiting amplifier, thus realize LA input bias voltage
Adjust, further, adjusted the bias voltage of LA input by the circulation of this closed feedback loop,
Until the bias voltage of limiting amplifier input is adjusted to expect required.
Optionally, described in any of the above-described embodiment, actuator may be disposed in photoreceiver.
Example, the actuator being illustrated in figure 6 optical receiver sensitivity regulation circuit is arranged at
In photoreceiver.First the component units of the photoreceiver shown in Fig. 6, PD (Photo are introduced
Diode) it is photosignal conversion unit, the optical signal received is changed into current signal；TIA
(Trans-impedance Amplifiers) is receiver preamplifier, i.e. trans-impedance amplifier,
For current signal being changed into the voltage signal of amplification；LA(Trans-impedance
Amplifiers) it is limiting amplifier, for being carried out by the weak voltage signal that preamplifier exports
Limited range enlargement exports, and the signal exported described limiting amplifier for rear class processing unit is carried out point
Analysis processes.
Due to TIA outfan static work level and LA input static work level not
With, for ensureing that TIA and LA can normally work, therefore between by capacitor element C1
Being of coupled connections with C2, capacitor element C1 and C2 is for isolating the static work of front stage circuit
Level, only transmission are loaded with the AC signal of useful information；Simultaneously as the signal input part of LA
It is high-impedance state, therefore resistance R1 and R2 on holding wire is pulled upward to the reference power source Vref of LA,
R1 and R2 provides static work for LA signal input part again while loading as AC signal
Level Vref；Further, the resistance of resistance R3 is thousands of times of resistance R2 resistance, if R3
The resistance of resistance and R2 suitable, R3 can be lost useful AC signal amplitude because of shunting,
So the resistance of R3 needs much larger than R2, for isolating the high speed signal of LA input, it is to avoid
Affect whole normal circuit operation；Resistance R4 and the load that resistance R5 is LA outfan.
Concrete, the first digital-to-analogue conversion pin ADC1 and the second digital-to-analogue of microcontroller 1
Switched pins ADC2 is connected with two outfans of LA respectively, the of microcontroller 1
The voltage difference of one digital-to-analogue conversion pin ADC1 and the second digital-to-analogue conversion pin ADC2 is LA
The offset bias voltage of outfan, host computer monitors the offset of LA outfan in real time, with right
The DAC output that microcontroller 2 is carried out is controlled, and microcontroller 2 is according to this
The bias voltage of LA outfan generates regulation signal, and is exported by a digital-to-analogue conversion pin, electricity
Resistance R6 and resistance R7 carries out dividing potential drop adjustment to this regulation signal, and by electric capacity C3 to this point
Regulation signal after pressure adjusts is filtered processing, and adjusted voltage, this regulation voltage passes through
Resistance R3 acts on an input of described limiting amplifier, thus realizes inclined to LA input
Put the adjustment of voltage, further, adjust LA input by the circulation of this closed feedback loop
Bias voltage, until the bias voltage of limiting amplifier input is adjusted to expect required.
It should be noted that owing to the reference voltage Vref of LA can be along with LA supply voltage Vcc
Change and change, and the offser of LA input can change with the change of Vref, enters
And have influence on the sensitivity behaviour of photoreceiver.Therefore to ensure LA stable operating voltage, with
Just this power supply had both been provided that the ability of the required electric current of LA work, can make as voltage reference source again
With, it is ensured that the offser of LA input stablizes, and therefore provides high-precision voltage stabilizing electricity for LA
Source.
Should be noted that be each resistance unit above, capacitor cell can be one or more device
Combination realize, the most any of the above-described resistance unit can include at least one resistance, when above-mentioned
When comprising at least two resistance in one resistance unit, the resistance in described resistance unit can be in parallel
, it is also possible to it is series connection, and the size of described resistance can be fixing, it is also possible to be to become
Change；Above-mentioned capacitor cell can include at least one electric capacity, when comprising in above-mentioned capacitor cell
During at least two electric capacity, the electric capacity in described capacitor cell can be in parallel, it is also possible to is string
Join, and the size of described electric capacity can be fixing, it is also possible to be change
Last it is noted that above example is only in order to illustrate technical scheme, and
Non-to its restriction；Although the present invention being described in detail with reference to previous embodiment, ability
The those of ordinary skill in territory is it is understood that it still can be to the skill described in foregoing embodiments
Art scheme is modified, or wherein portion of techniques feature is carried out equivalent；And these are repaiied
Change or replace, not making the essence of appropriate technical solution depart from various embodiments of the present invention technical side
The spirit and scope of case.
Claims (9)
1. the adjusting apparatus of an optical receiver sensitivity, it is characterised in that including: detection control
Device processed, actuator and limiting amplifier；
The input of described detection controller is connected with the outfan of described limiting amplifier, is used for
Obtain the bias voltage of described limiting amplifier outfan, the outfan of described detection controller with
The input of described actuator connects, and described actuator is used for receiving described bias voltage, and root
Generate regulation voltage according to described bias voltage, export described regulation voltage to described limiting amplifier
An input；
Wherein, described detection controller includes: the first microcontroller；
First analog digital conversion pin of described first microcontroller and the second analog digital conversion pin are respectively
It is connected with two outfans of described limiting amplifier, is used for obtaining the output of described limiting amplifier
The bias voltage of end, sends described bias voltage to described actuator.
The adjusting apparatus of optical receiver sensitivity the most according to claim 1, its feature exists
In, described actuator includes: the second microcontroller, regulation unit；
Described second microcontroller is connected with described detection controller, is used for receiving described detection control
The bias voltage that device processed sends, and generate regulation signal according to described bias voltage, by a number
Mould switched pins is sent to described regulation unit；Described regulation unit is for described regulation signal
It is filtered voltage adjusted with voltage division processing, described regulation voltage is sent to described amplitude limit
One input of amplifier.
The adjusting apparatus of optical receiver sensitivity the most according to claim 2, its feature exists
In, described regulation unit includes: capacitor cell and resistance pressure-dividing network；
First end of described resistance pressure-dividing network and the digital-to-analogue conversion pin of described second microcontroller
Connecting, the second end is connected with the first end of described capacitor cell, the second end of described capacitor cell
It is connected to ground；Described resistance pressure-dividing network is for the regulation letter to described second microcontroller output
Number carry out voltage division processing.
The adjusting apparatus of optical receiver sensitivity the most according to claim 3, its feature exists
In, described resistance pressure-dividing network includes: the first resistance unit and the second resistance unit；
First end of described first resistance unit and the digital-to-analogue conversion pin of described second microcontroller
Connecting, the second end is connected with the first end of described second resistance unit, described second resistance unit
The first end be connected with the first end of described capacitor cell, the second end is connected to ground.
The adjusting apparatus of optical receiver sensitivity the most according to claim 1, its feature exists
In, also including: the 3rd resistance unit, described actuator is connected by described 3rd resistance unit
An input to described limiting amplifier.
The adjusting apparatus of optical receiver sensitivity the most according to claim 1, its feature exists
In, also include: the 4th resistance unit and the 5th resistance unit；
Described first end of the 4th resistance unit is connected with an outfan of described limiting amplifier,
Second end is connected to ground, and the first end of described 5th resistance unit is another with described limiting amplifier
One outfan connects, and the second end is connected to ground.
The adjusting apparatus of optical receiver sensitivity the most according to claim 2, its feature exists
In, described detection controller includes: the 3rd microcontroller and interface convertor；
First analog digital conversion pin of described 3rd microcontroller and the second analog digital conversion pin are respectively
It is connected with two outfans of described limiting amplifier, is used for obtaining the output of described limiting amplifier
The bias voltage of end；
Described interface convertor for being transferred to host computer by described bias voltage, and passes through described
Described second microcontroller is controlled by host computer.
The adjusting apparatus of optical receiver sensitivity the most according to claim 7, its feature exists
In, described 3rd microcontroller and described interface convertor are positioned on industrial control board.
The adjusting apparatus of optical receiver sensitivity the most according to claim 1, its feature exists
In, described actuator is arranged in described photoreceiver.
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| CN201410192819.2A CN104009806B (en) | 2014-05-08 | 2014-05-08 | Optical receiver sensitivity adjusting device |
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| CN201410192819.2A CN104009806B (en) | 2014-05-08 | 2014-05-08 | Optical receiver sensitivity adjusting device |
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| CN106556897B (en) * | 2015-09-29 | 2018-11-27 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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| CN104009806A (en) | 2014-08-27 |
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