CN107786277A - A kind of method and apparatus for light-receiving - Google Patents
A kind of method and apparatus for light-receiving Download PDFInfo
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- CN107786277A CN107786277A CN201610730465.1A CN201610730465A CN107786277A CN 107786277 A CN107786277 A CN 107786277A CN 201610730465 A CN201610730465 A CN 201610730465A CN 107786277 A CN107786277 A CN 107786277A
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
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Abstract
It is an object of the invention to provide a kind of method and apparatus for light-receiving.The present invention generates the first electric current in photodiode, and first electric current is in response at the photodiode dark composition during without light-receiving, and is in response to the sum of the light composition and the dark composition in the light received at the photodiode；Then the second electric current is generated in current source；And the sum in first and second electric current described in input is received by amplifier, or receive first and second described electric current by input difference pair；Wherein, the second electric current generated can reduce the sensitiveness to the dark composition of the amplifier in the input or the input difference to place.Compared with prior art, the present invention utilizes the second electric current, dark composition is filtered out from total current as far as possible, dark composition is suppressed in real time, improve Signal-to-Noise, sensitivity and the monitoring precision of optical receiver are effectively improved, technology guarantee is provided for the commercialization of premium quality product.
Description
Technical field
The present invention relates to optical communication field, more particularly to a kind of technology for being used for light-receiving in optical communication field.
Background technology
Existing optical module receiving terminal generally uses avalanche diode (APD, Avalanche Diode) and trans-impedance amplifier
The combination of (TIA, Trans-impedance Amplifier) carries out the conversion of photosignal.For APD, due to dark electricity
Flow (Idark) presence (APD can also produce certain electric current when i.e. without optical signal incidence), can be same after trans-impedance amplifier is entered
Photoelectric current, which together amplifies and is converted to voltage signal, enters limiting amplifier (LA, Limiting Amplifier), so as to directly
Influence sensitivity and the monitoring precision of optical module.
The APD generally used at present, its dark current is about 50nA, and with the rise of temperature, dark current constantly increases maximum
200nA is can reach, and when the incident intensity of reception is -34dBm, photoelectric current (I caused by APDph) it is about 300nA, in the feelings
Under condition, because dark current is close with the size of current of photoelectric current, causes optical module monitoring error larger, there is error code generation.
Therefore by above-mentioned analysis, restricted by APD dark current, if having special want to sensitivity and monitoring precision
Ask, for example, it is desired to be higher by 3dm than the sensitivity of conventional modules product and monitoring precision, then existing scheme can not meet.
Fig. 1 shows a kind of structural representation of optical module receiving terminal in the prior art.As illustrated, carried out into TIA
The actual electric current of integration is photoelectric current IphWith dark current IdarkSum, i.e. Iin=Idark+Iph.When incident light very little, with temperature
The rise of degree, photoelectric current I caused by APDphMagnitude and dark current IdarkMagnitude it is suitable, now flow into TIA photoelectric current with
Dark current amplifies simultaneously finally to be exported through limiting amplifier LA after coupled match circuit, system end show as can not be effective
" 0 " " 1 " signal is differentiated, so as to produce error code, influences proper communication.
The content of the invention
It is an object of the invention to provide a kind of method and apparatus for light-receiving.
According to an aspect of the invention, there is provided a kind of optical receiver, including：
Photodiode, for generating the first electric current in the first output end, first electric current is in response in the photoelectricity
Dark composition when at diode without light-receiving, and be in response to light composition in the light received at the photodiode with
And the sum of the dark composition；
Adjustable current source, for generating the second electric current in the second output end；And
Amplifier, is coupled to receive the sum in first and second electric current described in input, or receive it is poor by inputting
Divide first and second electric current to described in；And
Wherein, the current source is set is comprised at least in a manner of generating second electric current：In the input or institute
Stating input difference reduces the sensitiveness to the dark composition of the amplifier to place.
Alternatively, described optical receiver, in addition to control module, for based on the temperature at the optical receiver
Degree so that adjustable current source changes the value of second electric current.
Alternatively, described optical receiver, in addition to sensor, for by the temperature at the optical receiver
The signal designation of degree is provided to the control module.
Alternatively, the control module be additionally operable to send temperature acquisition instruct to the sensor；And the sensor
For being instructed based on the temperature acquisition, the temperature at the optical receiver is obtained.
In accordance with a further aspect of the present invention, a kind of method is additionally provided, including：
At photodiode, the first electric current is generated, first electric current is in response to unglazed at the photodiode
Dark composition during reception, and it is in response to the light composition in the light received at the photodiode and the dark composition
Sum；
At current source, the second electric current is generated；And
At amplifier, the sum in first and second electric current described in input is received, or receive and pass through input difference pair
First and second described electric current；And
Wherein, second electric current is generated a value, and described value reduces in the input or the input difference to place
The sensitiveness to the dark composition of the amplifier.
Alternatively, methods described also includes：At control module, based on the temperature at the optical receiver so that
The current source changes the value of second electric current.
Alternatively, methods described also includes：At sensor, by the signal of the temperature at the optical receiver
Instruction is provided to the control module.
Alternatively, methods described also includes：The control module sends temperature acquisition and instructed to the sensor；And
At the sensor, the temperature acquisition instruction that the temperature at the optical receiver is received to respond is obtained.
Compared with prior art, the present invention generates the first electric current in photodiode, and first electric current is in response in institute
Dark composition during without light-receiving is stated at photodiode, and is in response in the light of the light received at the photodiode
The sum of composition and the dark composition；Then the second electric current is generated in current source；And the institute in input is received by amplifier
The sum of first and second electric current is stated, or receives first and second described electric current by input difference pair；Wherein, generated
Two electric currents can reduce the sensitiveness to the dark composition of the amplifier in the input or the input difference to place.From
And the present invention can utilize the second electric current, dark composition is filtered out from total current as far as possible, dark composition carried out in real time
Suppress, improve Signal-to-Noise, effectively improve sensitivity and the monitoring precision of optical receiver, be premium quality product
Commercialization provides technology guarantee.
Moreover, the present invention is also based on the temperature at the optical receiver to change the value of second electric current,
Further, the signal designation of the temperature at the optical receiver can also be provided to the control using sensor
Molding block；Further, temperature acquisition instruction can also be sent to the sensor, then the sensor is based on the temperature
Acquisition instructions, obtain the temperature at the optical receiver.So as to which the present invention can be right in real time according to the change of environment temperature
Dark composition is effectively suppressed, and improves Signal-to-Noise, effectively improves sensitivity and the monitoring essence of optical receiver
Degree, technology guarantee is provided for the commercialization of premium quality product.
Brief description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, of the invention is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 shows a kind of structural representation of optical module receiving terminal in the prior art；
A kind of optical receiver that Fig. 2 (A) and Fig. 2 (B) is shown respectively according to a preferred embodiment of the present invention is illustrated
Figure；
Fig. 3 shows a kind of optical receiver schematic diagram according to a preferred embodiment of the present invention；
Fig. 4 shows a kind of optical receiver schematic diagram according to a preferred embodiment of the present invention；
Fig. 5 shows a kind of method for optical reception schematic diagram according to a preferred embodiment of the present invention；
Fig. 6 shows a kind of method for optical reception schematic diagram according to a preferred embodiment of the present invention；
Fig. 7 shows a kind of method for optical reception schematic diagram according to a preferred embodiment of the present invention；
Fig. 8 shows a kind of circuit diagram of control module according to a preferred embodiment of the present invention.
Same or analogous reference represents same or analogous part in accompanying drawing.
Embodiment
It should be mentioned that some exemplary embodiments are described as before exemplary embodiment is discussed in greater detail
The processing described as flow chart or method.Although operations are described as the processing of order by flow chart, therein to be permitted
Multioperation can be implemented concurrently, concomitantly or simultaneously.In addition, the order of operations can be rearranged.When it
The processing can be terminated when operation is completed, it is also possible to the additional step being not included in accompanying drawing.The processing
It can correspond to method, function, code, subroutine, subprogram etc..
Concrete structure and function detail disclosed herein are only representational, and are for describing showing for the present invention
The purpose of example property embodiment.But the present invention can be implemented by many alternative forms, and it is not interpreted as
It is limited only by the embodiments set forth herein.
Although it should be appreciated that may have been used term " first ", " second " etc. herein to describe unit,
But these units should not be limited by these terms.It is used for the purpose of using these terms by a unit and another unit
Make a distinction.For example, in the case of the scope without departing substantially from exemplary embodiment, it is single that first module can be referred to as second
Member, and similarly second unit can be referred to as first module.Term "and/or" used herein above include one of them or
Any and all combination of more listed associated items.
Term used herein above is not intended to limit exemplary embodiment just for the sake of description specific embodiment.Unless
Context clearly refers else, otherwise singulative used herein above "one", " one " also attempt to include plural number.Should also
When understanding, term " comprising " and/or "comprising" used herein above provide stated feature, integer, step, operation,
The presence of unit and/or component, and do not preclude the presence or addition of other one or more features, integer, step, operation, unit,
Component and/or its combination.
It should further be mentioned that in some replaces realization modes, the function/action being previously mentioned can be according to different from attached
The order indicated in figure occurs.For example, depending on involved function/action, the two width figures shown in succession actually may be used
Substantially simultaneously to perform or can perform in a reverse order sometimes.
The present invention is described in further detail below in conjunction with the accompanying drawings.
A kind of optical receiver that Fig. 2 (A) and Fig. 2 (B) is shown respectively according to a preferred embodiment of the present invention is illustrated
Figure.
The optical receiver includes photodiode 1, adjustable current source 2 and amplifier 3.
When no light injects the photodiode 1, or has the light injection photodiode 1, the light
Electric diode 1 can generate the first electric current in the first output end.Wherein, first output end is the photodiode
The port of output current in 1.
When no light injects the photodiode 1, first electric current is in response at the photodiode 1
Dark composition during without light-receiving；When there is light to inject the photodiode 1, first electric current is in response in the light
The sum of the light composition of the light received at electric diode 1 and the dark composition.
Usually, the dark composition is in the first electric current (Iin) in show as dark current (Idark) form, the light
Composition shows as photoelectric current (I in first electric currentph) form.As shown in Fig. 2 exported from the photodiode 1
Electric current is Iin=Idark+Iph。
Adjustable current source 2 can generate the second electric current in the second output end, wherein, second output end is
For the port of output current in adjustable current source 2.
As shown in Fig. 2 (A), the amplifier 3 receives first electric current that the photodiode 1 exports in input
And the sum of the second electric current that adjustable current source 2 is exported；Those skilled in the art will be understood that in this reception
Under mode, the input of the amplifier 3 is single ended input, after first electric current first converges with second electric current, then is inputted
Into the amplifier 3.
Or as shown in Fig. 2 (B), the amplifier 3 and the photodiode 1 and adjustable current source 2
It is connected, and by input difference to receiving first electric current that the photodiode 1 exports and described adjustable
The sum for the second electric current that current source 2 is exported；Those skilled in the art will be understood that under this reception mode, the amplification
The input of device 3 is Differential Input.
In addition, those skilled in the art will be understood that the amplifier 3 in the present invention is sensu lato amplifier, bag
Containing the device such as each class A amplifier A or amplifying circuit.Two-way electric current by Differential Input into the amplifier 3, by internal circuit
After realizing the subtracting each other of two-way electric current, amplifying, difference output is realized by differential pair.Here, the processing procedure of the amplifier 3 can
With as follows：Two-way electric current is by Differential Input into the amplifier 3, and the amplifying circuit of the amplifier is by two-way electric current
Voltage is converted to, and after voltage is subtracted each other, amplify, difference output is realized by differential pair；Or two-way electric current is defeated by difference
Enter into the amplifier 3, two-way electric current is converted to voltage by the amplifying circuit of the amplifier, and real during conversion
Now amplify, then subtract each other voltage, difference output is realized by differential pair.In other words, those skilled in the art will be understood that institute
The enhanced processing for stating amplifier is not limited to any one or more processing steps wherein and realized.
Comprised at least here, the current source is set in a manner of generating second electric current：In the input or institute
Stating input difference reduces the sensitiveness to the dark composition of the amplifier to place.
Wherein, the numerical value of second electric current, can be generated based on the fixed numbers pre-seted；It can also be based on pre-
If the generation model of value is generated, such as sometime corresponding to a certain numerical value；It is highly preferred that it can be connect based on the optics
Receive the temperature generation at device.
Followed in the path that all electric currents shown in the present invention are flowed through here, those skilled in the art will be understood that
Kirchhoff's current law (KCL), i.e., on any of circuit node, at any one time, the electric current sum for flowing into node is equal to outflow section
The electric current sum of point.Therefore, the sense of current in Fig. 2 to Fig. 4 is only to illustrate, and the sense of current in figure only represents in logic
The sense of current, the current values of the different directions in circuit on each node are not limiting as.It is described adjustable by taking Fig. 2 (A) as an example
The second electric current that the current source 2 of section is exported is combined with the first electric current that the photodiode 1 is exported, second electricity
Stream can be by the I in first electric currentdarkSuppressed or eliminated so that the electric current for flowing into the amplifier 3 only has photoelectricity
Flow IphPart, with reach suppress dark current improve Signal-to-Noise, improve module sensitivity and monitor precision purpose.
Preferably, adjustable current source 2 can flow through biasing on circuit by adjusting first electric current
Voltage generates second electric current, to suppress to the dark composition in first electric current.
Fig. 3 shows a kind of optical receiver schematic diagram according to a preferred embodiment of the present invention.
The optical receiver includes photodiode 1, adjustable current source 2, amplifier 3 and control module 4.
Wherein, the photodiode 1, adjustable current source 2, amplifier 3 it is identical with the corresponding intrument shown in Fig. 2 or
It is similar, therefore will not be repeated here, and be incorporated herein by reference.
The control module 4 is based on the temperature at the optical receiver so that adjustable current source changes
The value of second electric current.
Here, the temperature at the optical receiver can be obtained using such as sensor etc..The base of control module 4
In previously known dark current change curve, or constantly learn according to historical data the relation of obtained dark current and temperature,
Change the value of second electric current based on the temperature so that second electric current can in first electric current it is dark into
Divide and suppressed.
Preferably, the control module 4 can be then turned on when the temperature at the optical receiver reaches certain threshold value
Regulatory function so that adjustable current source changes the value of second electric current.
Preferably due to caused dark composition may be different at the same temperature for the photodiode of different attribute, because
This, the value of second electric current can also be on the basis of based on the temperature, with reference to the device attribute of the photodiode
To be adjusted.
Fig. 4 shows a kind of optical receiver schematic diagram according to a preferred embodiment of the present invention.
The optical receiver includes photodiode 1, adjustable current source 2, amplifier 3 and the and of control module 4
Sensor 5.
Wherein, the photodiode 1, adjustable current source 2, amplifier 3, the control module 4 and Fig. 2 or Fig. 3
Shown corresponding intrument is same or similar, therefore will not be repeated here, and is incorporated herein by reference.
The sensor 5 provides the signal designation of the temperature at the optical receiver to the control mould
Block.
Specifically, the sensor 5 is configured in suitable position, near the photodiode 2, or
It is on other predetermined positions, to obtain the temperature at the optical receiver；Then, the sensor 5 will be in the optics
The signal designation of the temperature at receiver is provided to the control module 4, so that the control module 4 is based on the temperature
To control the value of second electric current.
Here, the frequency that the sensor 5 obtains the signal designation of temperature or the offer temperature can be periodic,
Can also be triggered based on event, provided if when temperature change exceedes certain threshold value as described in temperature signal designation etc..
Preferably, the control module 4 sends temperature acquisition and instructed to the sensor 5；Then the sensor 5 is based on
The temperature acquisition instruction, obtains the temperature at the optical receiver.
Specifically, the control module 4 can be periodically or based on triggering to send temperature acquisition to the sensor 5
Instruction, the triggering is such as clocked flip, based on specific events trigger.For example, when the control module 4 is in week certain time
Second electric current was not adjusted in phase, then the control module 4 sends temperature acquisition instruction to the sensor 5, with true
Determine whether Current Temperatures change, so as to which the change based on temperature adjusts the value of second electric current in time.
Then, the sensor 5 is instructed based on the temperature acquisition, obtains the temperature at the optical receiver, and will
The signal designation of the temperature is provided to the control module.
Fig. 5 shows a kind of method for optical reception schematic diagram according to a preferred embodiment of the present invention.
Methods described is applied to optical receiver, the optical receiver includes photodiode 1, current source 2 (or can
The current source 2 of regulation) and amplifier 3.
In step sl, at photodiode 1, the first electric current is generated, first electric current is in response in the photoelectricity
Dark composition when at diode 1 without light-receiving, and be in response in the light composition of the light received at the photodiode 1
And the sum of the dark composition；In step s 2, at current source 2, the second electric current is generated；In step s3, in amplifier 3
Place, receives sum in first and second electric current described in input, or receive pass through input difference pair it is described first and second
Electric current；Wherein, second electric current is generated a value, and described value is in the input or the input difference to described in place's reduction
The sensitiveness to the dark composition of amplifier.
In step sl, when no light injection photodiode 1, or light injects the photodiode
When 1, the photodiode 1 can generate the first electric current.
When no light injects the photodiode 1, first electric current is in response at the photodiode 1
Dark composition during without light-receiving；When there is light to inject the photodiode 1, first electric current is in response in the light
The sum of the light composition of the light received at electric diode 1 and the dark composition.
Usually, the dark composition is in the first electric current (Iin) in show as dark current (Idark) form, the light
Composition shows as photoelectric current (I in first electric currentph) form.As shown in Fig. 2 exported from the photodiode 1
Electric current is Iin=Idark+Iph。
In step s 2, the current source 2 can generate the second electric current.Wherein, second electric current is generated a value,
Described value reduces the sensitiveness to the dark composition of the amplifier in the input or the input difference to place.
Wherein, the numerical value of second electric current, can be generated based on the fixed numbers pre-seted；It can also be based on pre-
If the generation model of value is generated, such as sometime corresponding to a certain numerical value；It is highly preferred that it can be connect based on the optics
Receive the temperature generation at device.
In step s3, at amplifier 3, the sum in first and second electric current described in input is received, or is received logical
Cross first and second described electric current of input difference pair.
As shown in Fig. 2 (A), the amplifier 3 receives first electric current that the photodiode 1 exports in input
And the sum of the second electric current that the current source 2 is exported；Those skilled in the art will be understood that under this reception mode,
The input of the amplifier 3 is single ended input, after first electric current first converges with second electric current, then is input to described put
In big device 3.
Or as shown in Fig. 2 (B), the amplifier 3 is connected with the photodiode 1 and the current source 2,
And exported by input difference to receiving first electric current and the current source 2 that the photodiode 1 exports
The sum of second electric current；Those skilled in the art will be understood that under this reception mode the input of the amplifier 3 is difference
Input.
In addition, those skilled in the art will be understood that the amplifier 3 in the present invention is sensu lato amplifier, bag
Containing the device such as each class A amplifier A or amplifying circuit.Two-way electric current by Differential Input into the amplifier 3, by internal circuit
After realizing the subtracting each other of two-way electric current, amplifying, difference output is realized by differential pair.Here, the processing procedure of the amplifier 3 can
With as follows：Two-way electric current is by Differential Input into the amplifier 3, and the amplifying circuit of the amplifier is by two-way electric current
Voltage is converted to, and after voltage is subtracted each other, amplify, difference output is realized by differential pair；Or two-way electric current is defeated by difference
Enter into the amplifier 3, two-way electric current is converted to voltage by the amplifying circuit of the amplifier, and real during conversion
Now amplify, then subtract each other voltage, difference output is realized by differential pair.In other words, those skilled in the art will be understood that institute
The enhanced processing for stating amplifier is not limited to any one or more processing steps wherein and realized.
Preferably, in step s 2, the current source 2 can by adjust first electric current flow through it is inclined on circuit
Voltage is put to generate second electric current, to suppress to the dark composition in first electric current.
Fig. 6 shows a kind of method for optical reception schematic diagram according to a preferred embodiment of the present invention.
Methods described is applied to optical receiver, the optical receiver includes photodiode 1, current source 2 (or can
The current source 2 of regulation), amplifier 3 and control module 4.
In step sl, at photodiode 1, the first electric current is generated, first electric current is in response in the photoelectricity
Dark composition when at diode 1 without light-receiving, and be in response in the light composition of the light received at the photodiode 1
And the sum of the dark composition；In step s 4, at control module 4, based on the temperature at the optical receiver so that
The current source changes the value of second electric current；In step s 2, at current source 2, the second electric current is generated；In step S3
In, at amplifier 3, the sum in first and second electric current described in input is received, or receive the institute by input difference pair
State first and second electric current；Wherein, second electric current is generated a value, and described value is in the input or the input difference
The sensitiveness to the dark composition of the amplifier is reduced to place.
Wherein, methods described includes step S1, step S2, step S3 and step S4.The step S1 is to step S3 and Fig. 5
In corresponding step it is same or similar, therefore will not be repeated here, and be incorporated herein by reference.
Those skilled in the art will be understood that all parts of the optical receiver are continual work, on
It is merely illustrative to state the execution sequence of each step, not limitation of the present invention, the function/action being previously mentioned can be according to difference
The order indicated in accompanying drawing occurs.
Here, the temperature at the optical receiver can be obtained using such as sensor etc..In step s 4, it is described
Control module 4 based on previously known dark current change curve, or constantly learnt according to historical data obtained dark current with
The relation of temperature, change the value of second electric current based on the temperature so that second electric current can be to described first
Dark composition in electric current is suppressed.
Preferably, in step s 4, the control module 4 can reach certain threshold in the temperature at the optical receiver
During value, regulatory function is then turned on so that adjustable current source changes the value of second electric current.
Preferably due to caused dark composition may be different at the same temperature for the photodiode of different attribute, because
This, the value of second electric current can also be on the basis of based on the temperature, with reference to the device attribute of the photodiode
To be adjusted.
Fig. 7 shows a kind of method for optical reception schematic diagram according to a preferred embodiment of the present invention.
Methods described is applied to optical receiver, the optical receiver includes photodiode 1, current source 2 (or can
The current source 2 of regulation), amplifier 3, control module 4 and sensor 5.
In step sl, at photodiode 1, the first electric current is generated, first electric current is in response in the photoelectricity
Dark composition when at diode 1 without light-receiving, and be in response in the light composition of the light received at the photodiode 1
And the sum of the dark composition；In step s 5, at sensor, by the signal of the temperature at the optical receiver
Instruction is provided to the control module；In step s 4, at control module 4, based on the temperature at the optical receiver,
So that the current source changes the value of second electric current；In step s 2, at current source 2, the second electric current is generated；In step
In S3, at amplifier 3, the sum in first and second electric current described in input is received, or receive by input difference pair
First and second described electric current；Wherein, second electric current is generated a value, and described value is poor in the input or the input
Dividing reduces the sensitiveness to the dark composition of the amplifier to place.
Wherein, methods described includes step S1, step S2, step S3, step S4 and step S5.The step S1 is to step
S4 and step corresponding in Fig. 6 are same or similar, therefore will not be repeated here, and are incorporated herein by reference.
Those skilled in the art will be understood that all parts of the optical receiver are continual work, on
It is merely illustrative to state the execution sequence of each step, not limitation of the present invention, the function/action being previously mentioned can be according to difference
The order indicated in accompanying drawing occurs.
In step s 5, at sensor, by the signal designation of the temperature at the optical receiver provide to
The control module.
Specifically, the sensor 5 is configured in suitable position, near the photodiode 2, or
It is on other predetermined positions, to obtain the temperature at the optical receiver；Then, in step s 5, the sensor 5 will
The signal designation of the temperature at the optical receiver is provided to the control module 4, for the base of control module 4
The value of second electric current is controlled in the temperature.
Here, the frequency that the sensor 5 obtains the signal designation of temperature or the offer temperature can be periodic,
Can also be triggered based on event, provided if when temperature change exceedes certain threshold value as described in temperature signal designation etc..
Preferably, this method also includes step S6, and in step s 6, the control module sends temperature acquisition and instructed to institute
State sensor；Then, in step s 5, at the sensor, obtain the temperature at the optical receiver and connect with responding
The temperature acquisition instruction received.
Specifically, in step s 6, the control module 4 can be periodically or based on triggering and come to the sensor 5
Temperature acquisition instruction is sent, the triggering is such as clocked flip, based on specific events trigger.For example, work as the control module 4
Second electric current was not adjusted within cycle certain time, then the control module 4 sends temperature to the sensor 5 and adopted
Collection instruction, to determine whether Current Temperatures change, so as to which the change based on temperature adjusts the value of second electric current in time.
Then, in step s 5, the sensor 5 is instructed based on the temperature acquisition, is obtained at the optical receiver
Temperature, and the signal designation of the temperature is provided to the control module.
Fig. 8 shows a kind of circuit diagram of control module according to a preferred embodiment of the present invention.
The circuit is made up of three pmos pipes altogether.For wherein M3 pipes as switch, its main function is the control control
Whether the function of module opens；M1 manages forms cascode structure as current source output with M2 pipes, using cascode structure
Main advantage for its output impedance it is very big, for current source, when output impedance is bigger, current source is more stable, is more not easy
By the interference loaded.
The workflow of whole circuit is, by adjusting BSUP and BSDOWN biased electricals after circuit is with module normally upper electricity
Pressure carrys out control electric current ource electric current size, by, when BSCTL the be pulled low circuit whether normally-open come control circuit that adjust BSCTL
Open, circuit is closed when being driven high.If circuit is normally-open, electric current flows into amplifier by BSI and completes what dark composition suppressed
Function.In optical receiver, BSUP and BSDOWN can accurately be controlled by control module according to environment temperature；Enter
Preferably, the control module can select whether the function opens according to environment temperature to one step.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as to the involved claim of limitation.This
Outside, it is clear that the word of " comprising " one is not excluded for other units or step, and odd number is not excluded for plural number.That is stated in device claim is multiple
Unit or device can also be realized by a unit or device by software or hardware.The first, the second grade word is used for table
Show title, and be not offered as any specific order.
Claims (8)
1. a kind of optical receiver, including：
Photodiode, for generating the first electric current in the first output end, first electric current is in response in the pole of photoelectricity two
Dark composition when at pipe without light-receiving, and it is in response to the light composition in the light received at the photodiode and institute
State the sum of dark composition；
Adjustable current source, for generating the second electric current in the second output end；And
Amplifier, the sum in first and second electric current described in input is coupled to receive, or receives and pass through input difference pair
First and second described electric current；And
Wherein, the current source is set is comprised at least in a manner of generating second electric current：In the input or described defeated
Enter to reduce the sensitiveness to the dark composition of the amplifier at differential pair.
2. optical receiver according to claim 1, in addition to：
Control module, for based on the temperature at the optical receiver so that described in adjustable current source changes
The value of second electric current.
3. optical receiver according to claim 2, in addition to：
Sensor, for the signal designation of the temperature at the optical receiver to be provided to the control module.
4. optical receiver according to claim 3, wherein, the control module is additionally operable to：
Temperature acquisition is sent to instruct to the sensor；And
The sensor is used for：
Instructed based on the temperature acquisition, obtain the temperature at the optical receiver.
5. a kind of method, including：
At photodiode, the first electric current is generated, first electric current is in response at the photodiode without light-receiving
When dark composition, and be in response to the light composition in the light received at the photodiode and the dark composition
With；
At current source, the second electric current is generated；And
At amplifier, the sum in first and second electric current described in input is received, or receive the institute by input difference pair
State first and second electric current；And
Wherein, second electric current is generated a value, and described value is in the input or the input difference to described in place's reduction
The sensitiveness to the dark composition of amplifier.
6. the method according to claim 11, in addition to：
At control module, based on the temperature at the optical receiver so that the current source changes second electric current
Value.
7. the method according to claim 11, in addition to：
At sensor, the signal designation of the temperature at the optical receiver is provided to the control module.
8. the method according to claim 11, wherein, in addition to：
The control module sends temperature acquisition and instructed to the sensor；And
At the sensor, the temperature acquisition instruction that the temperature at the optical receiver is received to respond is obtained.
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| CN201610730465.1A CN107786277A (en) | 2016-08-25 | 2016-08-25 | A kind of method and apparatus for light-receiving |
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| CN201610730465.1A CN107786277A (en) | 2016-08-25 | 2016-08-25 | A kind of method and apparatus for light-receiving |
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| CN111800190A (en) * | 2020-06-03 | 2020-10-20 | 武汉电信器件有限公司 | Signal intensity calibration method and device of optical module based on avalanche photodiode |
| CN113949448A (en) * | 2020-07-16 | 2022-01-18 | 青岛海信宽带多媒体技术有限公司 | Optical module receiving optical power monitoring method and optical module |
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| US8520199B2 (en) * | 2010-05-31 | 2013-08-27 | Sumitomo Electric Device Innovations, Inc. | Method for measuring optical input power by avalanche photodiode |
| CN104469193A (en) * | 2013-09-17 | 2015-03-25 | 原相科技股份有限公司 | Sensing device with dark current compensation and control method thereof |
| CN105281834A (en) * | 2014-06-19 | 2016-01-27 | 瑞萨电子株式会社 | Optical receiver |
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| CN102322875A (en) * | 2011-08-01 | 2012-01-18 | 西安电子科技大学 | Visible light sensor |
| CN104469193A (en) * | 2013-09-17 | 2015-03-25 | 原相科技股份有限公司 | Sensing device with dark current compensation and control method thereof |
| CN105281834A (en) * | 2014-06-19 | 2016-01-27 | 瑞萨电子株式会社 | Optical receiver |
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| CN111800190A (en) * | 2020-06-03 | 2020-10-20 | 武汉电信器件有限公司 | Signal intensity calibration method and device of optical module based on avalanche photodiode |
| CN113949448A (en) * | 2020-07-16 | 2022-01-18 | 青岛海信宽带多媒体技术有限公司 | Optical module receiving optical power monitoring method and optical module |
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