CN102195583B - A kind of lithium niobate modulator trans-impedance amplifier gain control and method - Google Patents
A kind of lithium niobate modulator trans-impedance amplifier gain control and method Download PDFInfo
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- CN102195583B CN102195583B CN201110136791.7A CN201110136791A CN102195583B CN 102195583 B CN102195583 B CN 102195583B CN 201110136791 A CN201110136791 A CN 201110136791A CN 102195583 B CN102195583 B CN 102195583B
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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
-
- 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 kind of lithium niobate modulator trans-impedance amplifier gain control, electric resistance array unit in device be used for range selecting unit with the use of, according to the responsiveness scope of the described PD obtained from range selecting unit, after the resistance of adaptive selection correspondence, output signal to trans-impedance amplifier.The invention also discloses a kind of lithium niobate modulator trans-impedance amplifier gain control method, comprise the responsiveness scope that range selecting unit obtains the PD of lithium niobate modulator inside under different operating state; Electric resistance array unit, according to the responsiveness scope of the described PD obtained from range selecting unit, outputs signal to trans-impedance amplifier after the resistance of adaptive selection correspondence; Variable gain control unit amplifies the voltage signal that trans-impedance amplifier exports.Adopt device and method of the present invention, by the adaptive selection resistance of PD responsiveness scope, without the need to frequently changing resistance, thus reducing the manufacturing cost of product, improve the production efficiency of product.
Description
Technical field
The present invention relates to the lithium niobate modulator control technology in digital optical fiber transmit system technical field, particularly relate 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 meet the requirement of dense wavelength division multiplexing system, and light phase modulation method is more and more subject to the attention of industry.Light phase modulation method can represent different data-signals by multiple outs of phase of light wave, and therefore the relatively traditional light amplitude modulation method of its symbol rate reduces greatly, and spectrum efficiency obtains 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 more applicable for the optical transmission system of Large Copacity, long distance.
In optical phase modulation system, usually need to adopt lithium niobate modulator to carry out phase-modulation.And lithium niobate modulator is due to the characteristic of own material, its transmission characteristic, bias point can change with temperature and stress in other words, therefore the bias point of lithium niobate modulator must be made relatively stable by control technology.Lithium niobate modulator Bias point control technical scheme conventional at present comprises: 1) additional pilot signal on lithium niobate modulator, then to sample backlight detection signal filtering goes out the difference frequency signal wherein contained, when difference frequency blackout, lithium niobate modulator has just locked onto on normal bias point.2) Direct Sampling backlight detection signal, realizes the stable of lithium niobate modulator bias point by analyzing output optical signal power.
No matter adopt which kind of scheme above-mentioned, all need sampling backlight detection signal.The inner integrated electro of lithium niobate modulator detects diode (PD), carries out backlight signal detection, converts light signal to current signal, also can be called backlight detecting unit for the light signal exported lithium niobate modulator.The current signal obtained is converted to voltage signal by trans-impedance amplifier, then the voltage signal obtained is delivered to filter circuit, finally delivers to analog digital converting unit and samples.In order to ensure the quality of signals collecting, must ensure that voltage signal that trans-impedance amplifier exports is in a suitable scope.
At present, existing lithium niobate modulator trans-impedance amplifier gain control, realized by conventional, electric-resistance and digital regulation resistance, conventional, electric-resistance realizes fixing gain, and digital regulation resistance provides and regulates 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, in order to the lithium niobate modulator of the responsiveness scope and simultaneously compatible different manufacturers that cover the PD of same producer lithium niobate modulator, must need often to change conventional, electric-resistance, to change fixed gain, like this, just virtually add cost of goods manufactured, the production efficiency of product will inevitably be caused 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, without the need to frequently changing resistance, thus reduce the manufacturing cost of product, improve the production efficiency of product.
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 range selecting unit be connected with lithium niobate modulator, for obtaining the responsiveness scope of the PD of lithium niobate modulator inside under different operating state;
The electric resistance array unit be connected with described range selecting unit, for range selecting unit with the use of, according to the responsiveness scope of the described PD obtained from range selecting unit, after the resistance of adaptive selection correspondence, output signal to trans-impedance amplifier;
The variable gain unit be connected with described trans-impedance amplifier, amplifies for the voltage signal exported trans-impedance amplifier.
Wherein, this device also comprises: fixed gain unit and control unit; Wherein,
Fixed gain unit is connected with described variable gain unit, amplifies for the voltage signal exported variable gain unit;
Control unit is connected with described fixed gain unit, and the voltage signal exported for fixed gain unit of sampling processes, simultaneously the operating state of range selecting unit described in store status timing signal.
Wherein, described range selecting unit, under being further used for being operated in the operating state of demarcation; The operating state of range selecting unit by described variable gain unit and described control unit with the use of controlling.
Wherein, described electric resistance array unit, is further used in the operating state according to the current demarcation of range selecting unit, after determining the scope of corresponding PD responsiveness, and the resistance different by the PD responsiveness scope corresponding selection determined.
Wherein, described control unit, be further used for when a kind of operating state of calibration range selected cell in advance, when the output voltage of variable gain unit being adjusted to a half of sample circuit reference voltage in control unit, the operating state of the current demarcation of recording interval selected cell; When the output voltage of variable gain unit not being adjusted to a half of sample circuit reference voltage in control unit, the gain of variable gain unit is regulated again after range selecting unit is switched to another kind of state, make the output voltage of variable gain unit be the half of sample circuit reference voltage in control unit, range selecting unit operating state is now recorded the operating state of described demarcation as the operating state of demarcating.
A kind of lithium niobate modulator trans-impedance amplifier gain control method, the method comprises: the responsiveness scope of the PD of lithium niobate modulator inside under range selecting unit acquisition different operating state; Electric resistance array unit, according to the responsiveness scope of the described PD obtained from range selecting unit, outputs signal to trans-impedance amplifier after the resistance of adaptive selection correspondence; Variable gain unit amplifies the voltage signal that trans-impedance amplifier exports.
Wherein, the method also comprises: under described range selecting unit is operated in the operating state of demarcation, the operating state of range selecting unit by variable gain unit and control unit with the use of controlling.
Wherein, the method also comprises: electric resistance array unit in the operating state according to the current demarcation of range selecting unit, after determining the scope of corresponding PD responsiveness, the resistance different by the responsiveness scope corresponding selection determined.
Wherein, described operating state specifically comprising with the use of controlling by variable gain unit and control unit:
The luminous power of lithium niobate modulator output signal is set, a kind of operating state of calibration range selected cell in advance;
When the output voltage of variable gain unit being adjusted to a half of sample circuit reference voltage in control unit, the operating state of the current demarcation of recording interval selected cell is in control unit;
When the output voltage of variable gain unit not being adjusted to a half of sample circuit reference voltage in control unit, the gain of variable gain unit is regulated again after range selecting unit is switched to another kind of state, make the output voltage of variable gain unit be the half of sample circuit reference voltage in control unit, range selecting unit operating state is now recorded in control unit as the operating state of demarcating.
In device of the present invention, the range selecting unit be connected with lithium niobate modulator is for obtaining the responsiveness scope of the PD of lithium niobate modulator inside under different operating state; The electric resistance array unit be connected with range selecting unit, for range selecting unit with the use of, according to the responsiveness scope of the described PD obtained from range selecting unit, after the resistance of adaptive selection correspondence, output signal to trans-impedance amplifier; The variable gain unit be connected with trans-impedance amplifier, amplifies for the voltage signal exported trans-impedance amplifier.
Adopt the present invention, be different from prior art, not adopt fixing resistance, but adopt by the adaptively selected resistance of PD responsiveness scope, that is resistance is variable, therefore, without the need to frequently changing resistance, thus, this new lithium niobate modulator trans-impedance amplifier gain control of the present invention, the responsiveness scope of the PD of same producer lithium niobate modulator and the needs of the simultaneously lithium niobate modulator of compatible different manufacturers can be covered, reduce the manufacturing cost of product, improve the production efficiency of product.
Accompanying drawing explanation
Fig. 1 is the functional unit composition structural representation of apparatus of the present invention embodiment;
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 in Fig. 2;
Fig. 4 is the flow chart obtaining variable resistance value one example in 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 device, and the range selecting unit be connected with lithium niobate modulator is for obtaining the responsiveness scope of the PD of lithium niobate modulator inside under different operating state; The electric resistance array unit be connected with range selecting unit, for range selecting unit with the use of, according to the responsiveness scope of the described PD obtained from range selecting unit, after the resistance of adaptive selection correspondence, output signal to trans-impedance amplifier; The variable gain unit be connected with trans-impedance amplifier, amplifies for the voltage signal exported trans-impedance amplifier.
A kind of lithium niobate modulator trans-impedance amplifier gain control, mainly comprises following content:
This device mainly comprises: range selecting unit, electric resistance array unit, variable gain unit; Wherein, range selecting unit is for obtaining the responsiveness scope of the PD of lithium niobate modulator inside under different operating state; Electric resistance array unit be used for range selecting unit with the use of, according to the responsiveness scope of the described PD obtained from range selecting unit, the resistance of adaptive selection correspondence.The voltage signal that variable gain unit is used for trans-impedance amplifier exports amplifies.
That is, with the use of range selecting unit and electric resistance array unit, resistance that can be different according to the adaptive corresponding selection of different responsiveness scopes of the PD of lithium niobate modulator inside, thus can on the Demand Base of the responsiveness scope of the PD of satisfied covering same producer lithium niobate modulator and the simultaneously lithium niobate modulator of compatible different manufacturers, without the need to needing the difference of the responsiveness scope of the PD according to lithium niobate modulator as prior art owing to adopting conventional, electric-resistance, frequent replacing conventional, electric-resistance, visible, the present invention need not dismantle any unit in device and fitting operation just can satisfy the demands, thus reduce the manufacturing cost of product, improve the production efficiency of product.
Here it is to be noted, range selecting unit is connected with lithium niobate modulator, electric resistance array unit is connected with range selecting unit, with the use of range selecting unit and electric resistance array unit by the responsiveness scope of PD realize adaptive select corresponding resistance after output signal to trans-impedance amplifier, thus the voltage signal of trans-impedance amplifier output can be changed, variable gain unit is connected with trans-impedance amplifier, amplifies the voltage signal that trans-impedance amplifier exports.
Further, when variable gain unit is used for amplifying the voltage signal that trans-impedance amplifier exports, amplification coefficient can be regulated by Digital Control mode.
Further, this device also comprises: fixed gain unit and control unit, and wherein, fixed gain unit is connected with variable gain unit, amplifies for the voltage signal exported variable gain unit.Control unit is connected with fixed gain unit, and the voltage signal exported for fixed gain unit of sampling processes, simultaneously the operating state of store status timing signal range selecting unit.
Further, range selecting unit for be operated in demarcation operating state under, the operating state of range selecting unit by variable gain unit and control unit with the use of controlling.Because range selecting unit is under different operating state, the scope of corresponding PD responsiveness is also different.
Here, described operating state is specifically comprised with the use of controlling by variable gain unit and control unit: in setting device lithium niobate modulator output signal luminous power when, a kind of operating state of calibration range selected cell in advance, the output voltage of variable gain unit is adjusted to the half of sample circuit reference voltage in 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 the half of sample circuit reference voltage in control unit, then range selecting unit is switched to another kind of state, and then regulate the gain of variable gain unit, the output voltage of variable gain unit is made to be the half of sample circuit reference voltage in control unit, and using range selecting unit operating state now as the operating state of demarcating, be recorded in control unit.
Further, electric resistance array unit, is further used in the operating state of demarcating according to present scope selected cell, after determining the scope of corresponding PD responsiveness, and the resistance different by the responsiveness scope corresponding selection determined.
Here, in electric resistance array unit, the acquisition of resistance value specifically comprises: according to the minimum value of variable gain unit gain, the maximum of lithium niobate modulator PD responsiveness between different manufacturers, the maximum of lithium niobate modulator Output optical power, in fixed gain and control unit, the reference voltage of analog-digital converter, determines the numerical value of one of them resistance of electric resistance array unit; According to the minimum value of lithium niobate modulator PD responsiveness between the maximum of variable gain unit gain, different manufacturers, the minimum value of lithium niobate modulator Output optical power, in fixed gain and control unit, the reference voltage of analog-digital converter, determines the numerical value of electric resistance array unit another one resistance.
A kind of lithium niobate modulator trans-impedance amplifier gain control method, the method mainly comprises following content:
The responsiveness scope of the PD of lithium niobate modulator inside under range selecting unit acquisition different operating state; Electric resistance array unit, according to the responsiveness scope of the described PD obtained from range selecting unit, outputs signal to trans-impedance amplifier after the resistance of adaptive selection correspondence; Variable gain unit amplifies the voltage signal that trans-impedance amplifier exports.
Further, when variable gain unit amplifies the voltage signal that trans-impedance amplifier exports, amplification coefficient can be regulated by Digital Control mode.
Further, under range selecting unit is operated in the operating state of demarcation, the operating state of range selecting unit by variable gain unit and control unit with the use of controlling.
Further, described operating state is specifically comprised with the use of controlling by variable gain unit and control unit: in setting device lithium niobate modulator output signal luminous power when, a kind of operating state of calibration range selected cell in advance, the output voltage of variable gain unit is adjusted to the half of sample circuit reference voltage in 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 the half of sample circuit reference voltage in control unit, then range selecting unit is switched to another kind of state, and then regulate the gain of variable gain unit, the output voltage of variable gain unit is made to be the half of sample circuit reference voltage in control unit, and using range selecting unit operating state now as the operating state of demarcating, be recorded in control unit.
Further, electric resistance array unit in the operating state of demarcating according to present scope selected cell, after determining the scope of corresponding PD responsiveness, the resistance different by the responsiveness scope corresponding selection determined.
In sum, core of the present invention is by range selecting unit and electric resistance array unit, expands the responsiveness scope of the PD of the lithium niobate modulator that it is supported, thus can when not needing dismounting and installing any device, use many lithium niobate modulators, enhance productivity.
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme.
Be illustrated in figure 1 the functional unit composition structural representation of device embodiment, described device comprises: the PD of lithium niobate modulator, range selecting unit, electric resistance array unit, variable gain unit, fixed gain unit and control unit.PD is built in lithium niobate modulator, for responding to the light signal that lithium niobate modulator exports, and is converted to corresponding monitoring photoelectric current I according to the luminous power exported
pD.Trans-impedance amplifier is used for converting photo-signal to voltage signal V
tZ.Range selecting unit and electric resistance array unit matching use, and select different resistance for the responsiveness scope according to PD, thus change the voltage signal V of trans-impedance amplifier output
tZnumerical value.Variable gain unit, amplifies for the voltage signal exported trans-impedance amplifier, and amplification coefficient is K
tZ, amplification coefficient can be regulated by Digital Control mode.Fixed gain unit, amplifies for the voltage signal exported variable gain unit, obtains voltage signal V
oUT.Control unit, the voltage signal exported for fixed gain unit of sampling processes, simultaneously the operating state of storage device timing signal range selecting unit.
Be illustrated in figure 2 the electrical block diagram of apparatus of the present invention embodiment, the part be indicated by the dashed box in Fig. 2 corresponds to the functional unit in Fig. 1, it is the specific implementation of functional unit in Fig. 1, range selecting unit is realized by numerically controlled digital control analog switch, by digital controlled signal, complete the switching of the operating state that range selecting unit is demarcated.This switch is that one-to-many is selected.
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.
Variable gain unit is realized by digital analog converter, and for amplifying trans-impedance amplifier output voltage signal, amplification coefficient is K
tZ, amplification coefficient K
tZcan be regulated by 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 fixed gain unit.Adopt this method of attachment, then have:
Wherein, DAC is the numerical value of digital analog converter write, and its scope is 0≤DAC≤2
n-1.The gain ranging of the present embodiment setting variable gain unit is: 0.1≤K
tZ≤ 1.
Fixed gain unit is realized by the in-phase proportion amplifying circuit of operational amplifier, and this in-phase proportion amplifying circuit as shown in Figure 3.
Control unit, the voltage signal exported for fixed gain unit of sampling processes, simultaneously the operating state of storage device timing signal range selecting unit.Control unit is realized by analog-digital converter and controller, and 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 range selecting unit.
According in above-mentioned Fig. 2, the annexation of each unit of apparatus of the present invention, the voltage signal V finally exported
oUTwith the pass of back facet current be:
V
oUT=I
pDr
fk
tZk
a; K
tZfor amplification coefficient when variable gain unit amplifies the voltage signal that trans-impedance amplifier exports, K
afor fixed gain, R
ffor the resistance value in electric resistance array unit, I
pDfor the back facet current I of monitoring
pD.
Wherein, I
pDwith the pass of the optical signal power of lithium niobate modulator output be:
I
pD=P
or
sP; R
sPfor the responsiveness of PD, P
ofor the optical signal power of the light signal that lithium niobate modulator exports.
In order to reduce the change of sampled voltage to the impact of analog-digital converter in control unit, the voltage V that device finally exports by the present invention
oUTbe set in the half of analog-digital converter reference voltage, i.e. V
rEF/ 2.
Be illustrated in figure 4 the flow chart obtaining variable resistance value one example in electric resistance array unit of the inventive method, comprise the following steps:
Step 101, minimum value according to the gain of variable gain unit, the maximum of lithium niobate modulator PD responsiveness between different manufacturers, the maximum of lithium niobate modulator Output optical power, fixed gain K
awith analog digital converting unit reference voltage V
rEF, go out R by following formulae discovery
fLresistance value, computing formula is:
Wherein, R
sP (MAX)for the maximum of responsiveness.
Step 102, minimum value according to lithium niobate modulator PD responsiveness between the maximum of variable gain unit gain, different manufacturers, the minimum value of lithium niobate modulator Output optical power, fixed gain K
awith analog digital converting unit reference voltage V
rEF, go out R by following formulae discovery
fHresistance value, computing formula is
Wherein, R
sP (MIN)r
sP (MAX)for the minimum value of responsiveness.
Be illustrated in figure 5 the flow chart of operating state one example of the calibration range selected cell of the inventive method, comprise the following steps:
The luminous power P of lithium niobate modulator output signal in step 201, setting device
o.
Step 202, set a kind of operating state of digital control analog switch, constantly regulate the numerical value of write digital analog converter.
Step 203, output voltage V
oUTwhether can be adjusted to the half of sample circuit reference voltage in control unit, if can be adjusted to, then perform step 204; Otherwise, perform step 205.
Step 204, the operating state (i.e. the state of this switch controlling signal) of digital control analog switch is recorded in the FLASH of FPGA or DSP of control unit, terminates current process.
If how no matter step 205 regulate the numerical value of write digital analog converter, all can not by its output voltage V
oUTbe adjusted to the half of sample circuit reference voltage in control unit, then digital control analog switch be switched to another kind of state, and then regulate the numerical value of write digital analog converter, make its output voltage V
oUTfor the half of sample circuit reference voltage in control unit.
Step 206, the operating state (i.e. the state of this switch controlling signal) of digital control analog switch is recorded in the FLASH of FPGA or DSP of control unit, terminates current process.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (9)
1. a lithium niobate modulator trans-impedance amplifier gain control, is characterized in that, this device comprises:
The range selecting unit be connected with lithium niobate modulator, for obtaining the responsiveness scope of the photo-detector diode PD of lithium niobate modulator inside under different operating state;
The electric resistance array unit be connected with described range selecting unit, for range selecting unit with the use of, according to the responsiveness scope of the described PD obtained from range selecting unit, after the resistance of adaptive selection correspondence, output signal to trans-impedance amplifier;
The variable gain unit be connected with described trans-impedance amplifier, amplifies for the voltage signal exported trans-impedance amplifier.
2. device according to claim 1, is characterized in that, this device also comprises: fixed gain unit and control unit; Wherein,
Fixed gain unit is connected with described variable gain unit, amplifies for the voltage signal exported variable gain unit;
Control unit is connected with described fixed gain unit, and the voltage signal exported for fixed gain unit of sampling processes, simultaneously the operating state of range selecting unit described in store status timing signal.
3. device according to claim 2, is characterized in that, described range selecting unit, under being further used for being operated in the operating state of demarcation; The operating state of range selecting unit by described variable gain unit and described control unit with the use of controlling.
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 range selecting unit, after determining the scope of corresponding PD responsiveness, the resistance different by the PD responsiveness scope corresponding selection determined.
5. device according to claim 3, it is characterized in that, described control unit, be further used for when a kind of operating state of calibration range selected cell in advance, when the output voltage of variable gain unit being adjusted to a half of sample circuit reference voltage in control unit, the operating state of the current demarcation of recording interval selected cell; When the output voltage of variable gain unit not being adjusted to a half of sample circuit reference voltage in control unit, the gain of variable gain unit is regulated again after range selecting unit is switched to another kind of state, make the output voltage of variable gain unit be the half of sample circuit reference voltage in control unit, range selecting unit operating state is now recorded the operating state of described demarcation as the operating state of demarcating.
6. a lithium niobate modulator trans-impedance amplifier gain control method, is characterized in that, the method comprises: the responsiveness scope of the photo-detector diode PD of lithium niobate modulator inside under range selecting unit acquisition different operating state; Electric resistance array unit, according to the responsiveness scope of the described PD obtained from range selecting unit, outputs signal to trans-impedance amplifier after the resistance of adaptive selection correspondence; Variable gain unit amplifies the voltage signal that trans-impedance amplifier exports.
7. method according to claim 6, is characterized in that, the method also comprises: under described range selecting unit is operated in the operating state of demarcation, the operating state of range selecting unit by variable gain unit and control unit with the use of controlling.
8. method according to claim 7, it is characterized in that, the method also comprises: electric resistance array unit in the operating state according to the current demarcation of range selecting unit, after determining the scope of corresponding PD responsiveness, the resistance different by the responsiveness scope corresponding selection determined.
9. method according to claim 7, is characterized in that, described operating state is specifically comprised with the use of controlling by variable gain unit and control unit:
The luminous power of lithium niobate modulator output signal is set, a kind of operating state of calibration range selected cell in advance;
When the output voltage of variable gain unit being adjusted to a half of sample circuit reference voltage in control unit, the operating state of the current demarcation of recording interval selected cell is in control unit;
When the output voltage of variable gain unit not being adjusted to a half of sample circuit reference voltage in control unit, the gain of variable gain unit is regulated again after range selecting unit is switched to another kind of state, make the output voltage of variable gain unit be the half of sample circuit reference voltage in control unit, range selecting unit operating state is now recorded in control unit as the operating state of demarcating.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN102195583A CN102195583A (en) | 2011-09-21 |
| CN102195583B true CN102195583B (en) | 2016-01-20 |
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| 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 |
| CN103780303B (en) | 2012-10-24 | 2017-07-25 | 华为技术有限公司 | Optical module and its detection circuit |
| 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 |
| EP3429079B1 (en) * | 2016-03-11 | 2021-05-05 | Socionext Inc. | Amplifier circuit, reception circuit, and semiconductor integrated circuit |
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| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012159420A1 (en) | 2012-11-29 |
| CN102195583A (en) | 2011-09-21 |
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