CN102195583A - Device and method for controlling gain of transimpedance amplifier of lithium niobate (LiNbO3) modulator - Google Patents
Device and method for controlling gain of transimpedance amplifier of lithium niobate (LiNbO3) modulator Download PDFInfo
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- CN102195583A CN102195583A CN2011101367917A CN201110136791A CN102195583A CN 102195583 A CN102195583 A CN 102195583A CN 2011101367917 A CN2011101367917 A CN 2011101367917A CN 201110136791 A CN201110136791 A CN 201110136791A CN 102195583 A CN102195583 A CN 102195583A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
- H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3084—Automatic control in amplifiers having semiconductor devices in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves
Abstract
The invention discloses a device and method for controlling the gain of a transimpedance amplifier of a lithium niobate (LiNbO3) modulator. In the device, a resistor array unit is matched with a range selection unit so as to adaptively select the corresponding resistor and then output a signal to the transimpedance amplifier according to a responsivity range of a PD (photodiode) obtained from the range selection unit. The invention further discloses a method for controlling the gain of the transimpedance amplifier of the LiNbO3 modulator. The method comprises the following steps: the range selection unit acquires the responsivity range of the PD in the LiNbO3 modulator under different working conditions; the resistor array unit adaptively selects the corresponding resistor and then outputs the signal to the transimpedance amplifier according to the responsivity range of the PD obtained from the range selection unit; and a variable gain control unit amplifies the voltage signal output by the transimpedance amplifier. By utilizing the device and the method, the resistor is adaptively selected according to the responsivity range of the PD without frequent resistor replacement, thus lowering manufacturing cost of the product and improving production efficiency of the product.
Description
Technical field
The present invention relates to the lithium niobate modulator control technology in the digital fiber transmission system technical field, relate in particular to a kind of lithium niobate modulator trans-impedance amplifier gain control and method.
Background technology
In recent years, along with the raising of optical transmission system speed and the increase of capacity, traditional light amplitude modulation method more and more can not satisfy the requirement of dense wavelength division multiplexing system, and the light phase modulation method more and more is subjected to the attention of industry.The light phase modulation method can be represented different data-signals with a plurality of outs of phase of light wave, so the traditional relatively light amplitude modulation method of its code element speed reduces greatly, and spectrum efficiency has obtained significant raising.In addition, light phase modulation is compared amplitude modulation(PAM) and is also had more superior dispersion tolerance and polarization mode dispersion tolerance limit performance, is applicable to the optical transmission system of big capacity, long distance more.
In the light phase modulation system, need usually to adopt lithium niobate modulator to carry out phase modulated.And lithium niobate modulator is because self properties of materials, its transmission characteristic, and bias point can change with temperature and stress in other words, therefore must make the bias point of lithium niobate modulator relatively stable by control technology.Lithium niobate modulator bias point control technology scheme commonly used at present comprises: 1) add pilot signal on lithium niobate modulator, sample then detection signal backlight and filtering goes out the difference frequency signal that wherein contains, when the difference frequency blackout, lithium niobate modulator has just locked onto on the normal bias point.2) Direct Sampling detection signal backlight is realized the stable of lithium niobate modulator bias point by analyzing the output optical signal power.
No matter adopt above-mentioned which kind of scheme, all need the detection signal backlight of sampling.The inner integrated electro of lithium niobate modulator detects diode (PD), is used for the light signal of lithium niobate modulator output is carried out the backlight signal detection, converts light signal to current signal, also can be called detecting unit backlight.Trans-impedance amplifier is converted to voltage signal with the current signal that obtains, and then the voltage signal that obtains is delivered to filter circuit, delivers to analog digital converting unit at last and samples.In order to guarantee the quality of signals collecting, the voltage signal that must guarantee trans-impedance amplifier output is in a suitable scope.
At present, existing lithium niobate modulator trans-impedance amplifier gain control realizes that by conventional, electric-resistance and digital regulation resistance conventional, electric-resistance realizes fixing gain, and digital regulation resistance provides to be regulated the adjustable gain of trans-impedance amplifier.Because the responsiveness scope of the PD of the lithium niobate modulator of same producer is very wide, in addition, the responsiveness scope of the PD of the lithium niobate modulator of different manufacturers is not overlapping yet.Therefore, if adopt existing lithium niobate modulator trans-impedance amplifier gain control, for the responsiveness scope of the PD that covers same producer lithium niobate modulator and the lithium niobate modulator of compatible different manufacturers simultaneously, must need often to change conventional, electric-resistance, to change fixed gain, like this, just increase cost of goods manufactured virtually, will inevitably cause production efficiency of products low simultaneously.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of lithium niobate modulator trans-impedance amplifier gain control and method, by the adaptive selection resistance of PD responsiveness scope, need not frequently to change resistance, thereby reduced the manufacturing cost of product, improved production efficiency of products.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of lithium niobate modulator trans-impedance amplifier gain control, this device comprises:
The scope selected cell that links to each other with lithium niobate modulator is used to obtain the responsiveness scope of the PD of lithium niobate modulator inside under the different operating state;
With the electric resistance array unit that described scope selected cell links to each other, be used for being used with the scope selected cell, the responsiveness scope according to the described PD that obtains from the scope selected cell outputs signal to trans-impedance amplifier behind the resistance of adaptive selection correspondence;
The variable gain control unit that links to each other with described trans-impedance amplifier is used for the voltage signal of trans-impedance amplifier output is amplified.
Wherein, this device also comprises: fixed gain unit and control unit; Wherein,
The fixed gain unit links to each other with described variable gain control unit, is used for the voltage signal of variable gain unit output is amplified;
Control unit links to each other with described fixed gain unit, and the voltage signal of the fixed gain unit output that is used to sample is handled, simultaneously the operating state of the described scope selected cell of store status timing signal.
Wherein, described scope selected cell is further used for being operated under the operating state of demarcation; The operating state of scope selected cell is controlled by being used of described variable gain control unit and described control unit.
Wherein, described electric resistance array unit is further used in the operating state according to the current demarcation of scope selected cell, after the scope of the PD responsiveness of definite correspondence, by the different resistance of determining of PD responsiveness scope corresponding selection.
Wherein, described control unit, be further used under the situation of a kind of operating state of calibration range selected cell in advance, when a half that the output voltage of variable gain control unit can be adjusted to sample circuit reference voltage in the control unit, the operating state of the current demarcation of recording interval selected cell; When a half that the output voltage of variable gain unit can not be adjusted to sample circuit reference voltage in the control unit, the scope selected cell is switched to the gain of regulating the variable gain unit behind the another kind of state again, the output voltage that makes the variable gain unit is half of sample circuit reference voltage in the control unit, with the operating state of scope selected cell this moment as the operating state of demarcating and write down the operating state of described demarcation.
A kind of lithium niobate modulator trans-impedance amplifier gain control method, this method comprises: the scope selected cell obtains the responsiveness scope of the PD of lithium niobate modulator inside under the different operating state; The electric resistance array unit outputs signal to trans-impedance amplifier according to the responsiveness scope of the described PD that obtains from the scope selected cell behind the resistance of adaptive selection correspondence; The variable gain control unit amplifies the voltage signal of trans-impedance amplifier output.
Wherein, this method also comprises: described scope selected cell is operated under the operating state of demarcation, and the operating state of scope selected cell is controlled by being used of variable gain control unit and control unit.
Wherein, this method also comprises: the electric resistance array unit is in the operating state according to the current demarcation of scope selected cell, after the scope of the PD responsiveness of definite correspondence, by the different resistance of determining of responsiveness scope corresponding selection.
Wherein, described operating state is controlled specifically by being used of variable gain control unit and control unit and is comprised:
The luminous power of lithium niobate modulator output signal is set, in advance a kind of operating state of calibration range selected cell;
When a half that the output voltage of variable gain control unit can be adjusted to sample circuit reference voltage in the control unit, the operating state of the current demarcation of recording interval selected cell is in control unit;
When a half that the output voltage of variable gain unit can not be adjusted to sample circuit reference voltage in the control unit, the scope selected cell is switched to the gain of regulating the variable gain unit behind the another kind of state again, the output voltage that makes the variable gain unit is half of sample circuit reference voltage in the control unit, with the operating state of scope selected cell this moment as the operating state of demarcating and record in the control unit.
In the device of the present invention, the scope selected cell that links to each other with lithium niobate modulator is used to obtain the responsiveness scope of the PD of lithium niobate modulator inside under the different operating state; The electric resistance array unit that links to each other with the scope selected cell is used for being used with the scope selected cell, and the responsiveness scope according to the described PD that obtains from the scope selected cell outputs signal to trans-impedance amplifier behind the resistance of adaptive selection correspondence; The variable gain control unit that links to each other with trans-impedance amplifier is used for the voltage signal of trans-impedance amplifier output is amplified.
Adopt the present invention, be different from prior art, not to adopt fixing resistance, but adopt by the adaptively selected resistance of PD responsiveness scope, that is to say that resistance is variable, therefore, need not frequently to change resistance, thereby, this new lithium niobate modulator trans-impedance amplifier gain control of the present invention, can cover the responsiveness scope and the needs of the lithium niobate modulator of compatible different manufacturers simultaneously of the PD of same producer lithium niobate modulator, reduce the manufacturing cost of product, improve production efficiency of products.
Description of drawings
Fig. 1 is that the functional unit of apparatus of the present invention embodiment is formed structural representation;
Fig. 2 is the electrical block diagram of apparatus of the present invention embodiment;
Fig. 3 is the in-phase proportion amplifying circuit schematic diagram of fixed gain unit among Fig. 2;
Fig. 4 is the flow chart that obtains variable resistor numerical value one example in the electric resistance array unit of the inventive method;
Fig. 5 is the flow chart of operating state one example of the calibration range selected cell of the inventive method.
Embodiment
Basic thought of the present invention is: in the device, the scope selected cell that links to each other with lithium niobate modulator is used to obtain the responsiveness scope of the PD of lithium niobate modulator inside under the different operating state; The electric resistance array unit that links to each other with the scope selected cell is used for being used with the scope selected cell, and the responsiveness scope according to the described PD that obtains from the scope selected cell outputs signal to trans-impedance amplifier behind the resistance of adaptive selection correspondence; The variable gain control unit that links to each other with trans-impedance amplifier is used for the voltage signal of trans-impedance amplifier output is amplified.
A kind of lithium niobate modulator trans-impedance amplifier gain control mainly comprises following content:
This device mainly comprises: scope selected cell, electric resistance array unit, variable gain control unit; Wherein, the scope selected cell is used to obtain the responsiveness scope of the PD of lithium niobate modulator inside under the different operating state; The electric resistance array unit is used for being used with the scope selected cell, according to the responsiveness scope of the described PD that obtains from the scope selected cell, the resistance of adaptive selection correspondence.The variable gain control unit is used for the voltage signal of trans-impedance amplifier output is amplified.
That is to say, scope selected cell that is used and electric resistance array unit, can be according to the different resistance of the adaptive corresponding selection of different responsiveness scopes of the PD of lithium niobate modulator inside, thereby can be on the Demand Base of the responsiveness scope that satisfies the PD that covers same producer lithium niobate modulator and the lithium niobate modulator of compatible different manufacturers of while, need not as prior art owing to adopt conventional, electric-resistance need be according to the difference of the responsiveness scope of the PD of lithium niobate modulator, the frequent conventional, electric-resistance of changing, as seen, the present invention need not dismantle with fitting operation any unit in installing and just can satisfy the demands, thereby reduced the manufacturing cost of product, improved production efficiency of products.
Here it is to be noted, the scope selected cell links to each other with lithium niobate modulator, the electric resistance array unit links to each other with the scope selected cell, scope selected cell that is used and electric resistance array unit realize that by the responsiveness scope of PD adaptive the selection outputs signal to trans-impedance amplifier behind the corresponding resistance, thereby can change the voltage signal of trans-impedance amplifier output, the variable gain control unit links to each other with trans-impedance amplifier, and the voltage signal that trans-impedance amplifier is exported amplifies.
Further, when the variable gain control unit was used for voltage signal to trans-impedance amplifier output and amplifies, amplification coefficient can be regulated by the Digital Control mode.
Further, this device also comprises: fixed gain unit and control unit, wherein, the fixed gain unit links to each other with the variable gain control unit, is used for the voltage signal of variable gain unit output is amplified.Control unit links to each other with the fixed gain unit, and the voltage signal of the fixed gain unit output that is used to sample is handled, simultaneously the operating state of store status timing signal scope selected cell.
Further, the scope selected cell is used to be operated under the operating state of demarcation, and the operating state of scope selected cell is controlled by being used of variable gain control unit and control unit.Because the scope selected cell is under the different operating state, the scope of corresponding PD responsiveness also is different.
Here, described operating state is controlled specifically by being used of variable gain control unit and control unit and is comprised: in the setting device under the situation of the luminous power of lithium niobate modulator output signal, a kind of operating state of calibration range selected cell in advance, the output voltage of variable gain control unit is adjusted to half of sample circuit reference voltage in the control unit, if can be adjusted to, then the operating state of the current demarcation of recording interval selected cell is in control unit; If no matter how to regulate the gain of variable gain unit, all the output voltage of variable gain unit can not be adjusted to half of sample circuit reference voltage in the control unit, then the scope selected cell is switched to another kind of state, and then the gain of adjusting variable gain unit, the output voltage that makes the variable gain unit is half of sample circuit reference voltage in the control unit, and, record in the control unit the operating state of scope selected cell operating state at this moment as demarcation.
Further, the electric resistance array unit is further used in the operating state according to current scope selected cell demarcation, after the scope of the PD responsiveness of definite correspondence, by the different resistance of determining of responsiveness scope corresponding selection.
Here, obtaining specifically of resistance value comprises in the electric resistance array unit: according to the minimum value of variable gain unit gain, the maximum of lithium niobate modulator PD responsiveness between the different manufacturers, the maximum of lithium niobate modulator Output optical power, the reference voltage of analog-digital converter in fixed gain and the control unit is determined the numerical value of one of them resistance of electric resistance array unit; Minimum value according to lithium niobate modulator PD responsiveness between the maximum of variable gain unit gain, the different manufacturers, the minimum value of lithium niobate modulator Output optical power, the reference voltage of analog-digital converter in fixed gain and the control unit is determined the numerical value of electric resistance array unit another one resistance.
A kind of lithium niobate modulator trans-impedance amplifier gain control method, this method mainly comprises following content:
The scope selected cell obtains the responsiveness scope of the PD of lithium niobate modulator inside under the different operating state; The electric resistance array unit outputs signal to trans-impedance amplifier according to the responsiveness scope of the described PD that obtains from the scope selected cell behind the resistance of adaptive selection correspondence; The variable gain control unit amplifies the voltage signal of trans-impedance amplifier output.
Further, when the voltage signal that the variable gain control unit is exported trans-impedance amplifier amplified, amplification coefficient can be regulated by the Digital Control mode.
Further, the scope selected cell is operated under the operating state of demarcation, and the operating state of scope selected cell is controlled by being used of variable gain control unit and control unit.
Further, described operating state is controlled specifically by being used of variable gain control unit and control unit and is comprised: in the setting device under the situation of the luminous power of lithium niobate modulator output signal, a kind of operating state of calibration range selected cell in advance, the output voltage of variable gain control unit is adjusted to half of sample circuit reference voltage in the control unit, if can be adjusted to, then the operating state of the current demarcation of recording interval selected cell is in control unit; If no matter how to regulate the gain of variable gain unit, all the output voltage of variable gain unit can not be adjusted to half of sample circuit reference voltage in the control unit, then the scope selected cell is switched to another kind of state, and then the gain of adjusting variable gain unit, the output voltage that makes the variable gain unit is half of sample circuit reference voltage in the control unit, and, record in the control unit the operating state of scope selected cell operating state at this moment as demarcation.
Further, the electric resistance array unit is in the operating state of demarcating according to current scope selected cell, after the scope of the PD responsiveness of definite correspondence, by the different resistance of determining of responsiveness scope corresponding selection.
In sum, core of the present invention is by scope selected cell and electric resistance array unit, expands the responsiveness scope of PD of the lithium niobate modulator of its support, thereby can dismantle and install under the situation of any device not needing, use how tame lithium niobate modulator, enhance productivity.
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme.
The functional unit that is illustrated in figure 1 as device embodiment is formed structural representation, and described device comprises: the PD of lithium niobate modulator, scope selected cell, electric resistance array unit, variable gain control unit, fixed gain unit and control unit.PD is built in the lithium niobate modulator, is used to respond to the light signal of lithium niobate modulator output, and is converted to corresponding monitoring photoelectric current I according to the luminous power of output
PDTrans-impedance amplifier is used for converting photo-signal to voltage signal V
TZScope selected cell and electric resistance array unit matching are used, and are used for selecting different resistance according to the responsiveness scope of PD, thereby change the voltage signal V of trans-impedance amplifier output
TZNumerical value.The variable gain control unit is used for the voltage signal of trans-impedance amplifier output is amplified, and amplification coefficient is K
TZ, amplification coefficient can be regulated by the Digital Control mode.The fixed gain unit is used for the voltage signal of variable gain unit output is amplified, and obtains voltage signal V
OUTControl unit, the voltage signal of the fixed gain unit output that is used to sample is handled, simultaneously the operating state of storage device timing signal scope selected cell.
Be illustrated in figure 2 as the electrical block diagram of apparatus of the present invention embodiment, the part that the with dashed lines frame table shows among Fig. 2 is corresponding to the functional unit among Fig. 1, it is the specific implementation of functional unit among Fig. 1, the scope selected cell is realized by numerically controlled digital control analog switch, by digital controlled signal, finish the switching of the operating state of scope selected cell demarcation.This switch is that one-to-many is selected.
The electric resistance array unit is realized by two conventional, electric-resistance of parallel connection, is respectively R
FLAnd R
FH, R
FLAnd R
FHInput be connected with digital control analog switch respectively, output links together, and receives the output of trans-impedance amplifier.
The variable gain control unit is realized by digital analog converter, is used for the trans-impedance amplifier output voltage signal is amplified, and amplification coefficient is K
TZ, amplification coefficient K
TZCan regulate by the Digital Control mode.The output voltage V of trans-impedance amplifier
TZBe connected to the reference voltage end of digital analog converter, the output voltage signal V of digital analog converter
DACBe connected to the fixed gain unit.Adopt this method of attachment, then have:
Wherein, DAC is the numerical value that digital analog converter writes, and its scope is 0≤DAC≤2
N-1.The gain ranging that present embodiment is set the variable gain control unit is: 0.1≤K
TZ≤ 1.
The fixed gain unit realizes that by the in-phase proportion amplifying circuit of operational amplifier this in-phase proportion amplifying circuit as shown in Figure 3.
Control unit, the voltage signal of the fixed gain unit output that is used to sample is handled, simultaneously the operating state of storage device timing signal scope selected cell.Control unit realizes that by analog-digital converter and controller controller can adopt FPGA or DSP to realize.The FLASH unit of FPGA or DSP inside can be used for the operating state of storage device timing signal scope selected cell.
In above-mentioned Fig. 2, the annexation of each unit of apparatus of the present invention, Shu Chu voltage signal V at last
OUTWith the pass of back facet current be:
V
OUT=I
PDR
FK
TZK
AK
TZAmplification coefficient when the voltage signal of trans-impedance amplifier output being amplified for the variable gain control unit, K
ABe fixed gain, R
FBe the resistance value in the electric resistance array unit, I
PDBack facet current I for monitoring
PD
Wherein, I
PDWith the pass of the optical signal power of lithium niobate modulator output be:
I
PD=P
OR
SPR
SPBe the responsiveness of PD, P
OOptical signal power for the light signal of lithium niobate modulator output.
For the variation that the reduces sampled voltage influence to analog-digital converter in the control unit, the present invention will install the voltage V of last output
OUTBe set in half of analog-digital converter reference voltage, i.e. V
REF/ 2.
Be illustrated in figure 4 as the flow chart that in the electric resistance array unit, obtains variable resistor numerical value one example of the inventive method, may further comprise the steps:
Wherein, R
SP (MAX)Maximum for responsiveness.
Step 102, according to the minimum value of lithium niobate modulator PD responsiveness between the maximum of variable gain unit gain, the different manufacturers, the minimum value of lithium niobate modulator Output optical power, fixed gain K
AWith analog digital converting unit reference voltage V
REF, calculate R by following formula
FHResistance value, computing formula is
Wherein, R
SP (MIN)R
SP (MAX)Minimum value for responsiveness.
Be illustrated in figure 5 as the flow chart of operating state one example of the calibration range selected cell of the inventive method, may further comprise the steps:
The luminous power P of lithium niobate modulator output signal in step 201, the setting device
O
A kind of operating state of step 202, the digital control analog switch of setting is constantly regulated the numerical value that writes digital analog converter.
Step 203, output voltage V
OUTWhether can be adjusted to half of sample circuit reference voltage in the control unit, if can be adjusted to, then execution in step 204; Otherwise, execution in step 205.
Step 204, the operating state (i.e. the state of this switch controlling signal) of digital control analog switch is recorded among the FLASH of the FPGA of control unit or DSP, finish current flow process.
If how no matter step 205 regulate the numerical value that writes digital analog converter, all can not be with its output voltage V
OUTBe adjusted to half of sample circuit reference voltage in the control unit, then digital control analog switch switched to another kind of state, and then regulate the numerical value that writes digital analog converter, make its output voltage V
OUTBe half of sample circuit reference voltage in the control unit.
Step 206, the operating state (i.e. the state of this switch controlling signal) of digital control analog switch is recorded among the FLASH of the FPGA of control unit or DSP, finish current flow process.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (9)
1. lithium niobate modulator trans-impedance amplifier gain control is characterized in that this device comprises:
The scope selected cell that links to each other with lithium niobate modulator is used to obtain the responsiveness scope of the PD of lithium niobate modulator inside under the different operating state;
With the electric resistance array unit that described scope selected cell links to each other, be used for being used with the scope selected cell, the responsiveness scope according to the described PD that obtains from the scope selected cell outputs signal to trans-impedance amplifier behind the resistance of adaptive selection correspondence;
The variable gain control unit that links to each other with described trans-impedance amplifier is used for the voltage signal of trans-impedance amplifier output is amplified.
2. device according to claim 1 is characterized in that, this device also comprises: fixed gain unit and control unit; Wherein,
The fixed gain unit links to each other with described variable gain control unit, is used for the voltage signal of variable gain unit output is amplified;
Control unit links to each other with described fixed gain unit, and the voltage signal of the fixed gain unit output that is used to sample is handled, simultaneously the operating state of the described scope selected cell of store status timing signal.
3. device according to claim 1 and 2 is characterized in that, described scope selected cell is further used for being operated under the operating state of demarcation; The operating state of scope selected cell is controlled by being used of described variable gain control unit and described control unit.
4. device according to claim 3, it is characterized in that described electric resistance array unit is further used in the operating state according to the current demarcation of scope selected cell, after determining the scope of corresponding PD responsiveness, by the different resistance of determining of PD responsiveness scope corresponding selection.
5. device according to claim 3, it is characterized in that, described control unit, be further used under the situation of a kind of operating state of calibration range selected cell in advance, when a half that the output voltage of variable gain control unit can be adjusted to sample circuit reference voltage in the control unit, the operating state of the current demarcation of recording interval selected cell; When a half that the output voltage of variable gain unit can not be adjusted to sample circuit reference voltage in the control unit, the scope selected cell is switched to the gain of regulating the variable gain unit behind the another kind of state again, the output voltage that makes the variable gain unit is half of sample circuit reference voltage in the control unit, with the operating state of scope selected cell this moment as the operating state of demarcating and write down the operating state of described demarcation.
6. lithium niobate modulator trans-impedance amplifier gain control method, it is characterized in that this method comprises: the scope selected cell obtains the responsiveness scope of the PD of lithium niobate modulator inside under the different operating state; The electric resistance array unit outputs signal to trans-impedance amplifier according to the responsiveness scope of the described PD that obtains from the scope selected cell behind the resistance of adaptive selection correspondence; The variable gain control unit amplifies the voltage signal of trans-impedance amplifier output.
7. method according to claim 6 is characterized in that, this method also comprises: described scope selected cell is operated under the operating state of demarcation, and the operating state of scope selected cell is controlled by being used of variable gain control unit and control unit.
8. method according to claim 7, it is characterized in that, this method also comprises: the electric resistance array unit is in the operating state according to the current demarcation of scope selected cell, after the scope of the PD responsiveness of definite correspondence, by the different resistance of determining of responsiveness scope corresponding selection.
9. method according to claim 7 is characterized in that, described operating state is controlled specifically by being used of variable gain control unit and control unit and comprised:
The luminous power of lithium niobate modulator output signal is set, in advance a kind of operating state of calibration range selected cell;
When a half that the output voltage of variable gain control unit can be adjusted to sample circuit reference voltage in the control unit, the operating state of the current demarcation of recording interval selected cell is in control unit;
When a half that the output voltage of variable gain unit can not be adjusted to sample circuit reference voltage in the control unit, the scope selected cell is switched to the gain of regulating the variable gain unit behind the another kind of state again, the output voltage that makes the variable gain unit is half of sample circuit reference voltage in the control unit, with the operating state of scope selected cell this moment as the operating state of demarcating and record in the control unit.
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| CN201110136791.7A CN102195583B (en) | 2011-05-24 | 2011-05-24 | A kind of lithium niobate modulator trans-impedance amplifier gain control and method |
| PCT/CN2011/082165 WO2012159420A1 (en) | 2011-05-24 | 2011-11-14 | Gain control device and method for transimpedance amplifier of lithium niobate modulator |
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| CN201110136791.7A CN102195583B (en) | 2011-05-24 | 2011-05-24 | A kind of lithium niobate modulator trans-impedance amplifier gain control and method |
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| WO2012159420A1 (en) * | 2011-05-24 | 2012-11-29 | 中兴通讯股份有限公司 | Gain control device and method for transimpedance amplifier of lithium niobate modulator |
| CN103644926A (en) * | 2013-12-16 | 2014-03-19 | 上海华魏光纤传感技术有限公司 | Optical signal collection system |
| CN103780303A (en) * | 2012-10-24 | 2014-05-07 | 华为技术有限公司 | Optical module and detection circuit thereof |
| CN108781061A (en) * | 2016-03-11 | 2018-11-09 | 株式会社索思未来 | Amplifying circuit, receiving circuit and semiconductor integrated circuit |
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| US8139957B2 (en) * | 2008-06-24 | 2012-03-20 | General Instrument Corporation | High sensitivity optical receiver employing a high gain amplifier and an equalizing circuit |
| CN102195583B (en) * | 2011-05-24 | 2016-01-20 | 中兴通讯股份有限公司 | A kind of lithium niobate modulator trans-impedance amplifier gain control and method |
-
2011
- 2011-05-24 CN CN201110136791.7A patent/CN102195583B/en not_active Expired - Fee Related
- 2011-11-14 WO PCT/CN2011/082165 patent/WO2012159420A1/en active Application Filing
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| US6246282B1 (en) * | 1998-11-05 | 2001-06-12 | Nec Corporation | First stage amplifier circuit |
| JP2002368549A (en) * | 2001-06-07 | 2002-12-20 | Nec Miyagi Ltd | Automatic gain changeover system for front end amplifier for light receiving circuit |
| JP2004260396A (en) * | 2003-02-25 | 2004-09-16 | Ntt Electornics Corp | Preamplification circuit and light receiving device using the same |
| CN1812384A (en) * | 2005-01-26 | 2006-08-02 | 中兴通讯股份有限公司 | Apparatus for realizing automatic gain control in wideband wireless switch-in system terminal station |
| CN101276067A (en) * | 2008-05-05 | 2008-10-01 | 中兴通讯股份有限公司 | Dynamic control method and device of lithium niobate modulator |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012159420A1 (en) * | 2011-05-24 | 2012-11-29 | 中兴通讯股份有限公司 | Gain control device and method for transimpedance amplifier of lithium niobate modulator |
| CN103780303A (en) * | 2012-10-24 | 2014-05-07 | 华为技术有限公司 | Optical module and detection circuit thereof |
| CN103780303B (en) * | 2012-10-24 | 2017-07-25 | 华为技术有限公司 | Optical module and its detection circuit |
| US9998227B2 (en) | 2012-10-24 | 2018-06-12 | Huawei Technologies Co., Ltd. | Optical module and detection circuit thereof |
| CN103644926A (en) * | 2013-12-16 | 2014-03-19 | 上海华魏光纤传感技术有限公司 | Optical signal collection system |
| CN108781061A (en) * | 2016-03-11 | 2018-11-09 | 株式会社索思未来 | Amplifying circuit, receiving circuit and semiconductor integrated circuit |
| CN108781061B (en) * | 2016-03-11 | 2022-04-08 | 株式会社索思未来 | Amplifying circuit, receiving circuit and semiconductor integrated circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102195583B (en) | 2016-01-20 |
| WO2012159420A1 (en) | 2012-11-29 |
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