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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- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910003327 LiNbO3 Inorganic materials 0.000 title abstract 4
- 238000005070 sampling Methods 0.000 claims description 29
- 230000003287 optical effect Effects 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000003199 nucleic acid amplification method Methods 0.000 description 8
- 230000003321 amplification Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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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
- 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
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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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 invention relates to a lithium niobate modulator control technology in the technical field of digital optical fiber transmission systems, in particular to a lithium niobate modulator trans-impedance amplifier gain control device and method.
Background
In recent years, with the increase of speed and capacity of optical transmission systems, the conventional optical amplitude modulation method cannot meet the requirements of dense wavelength division multiplexing systems, and the optical phase modulation method is receiving more and more attention from the industry. The optical phase modulation method can use a plurality of different phases of the light wave to represent different data signals, so that the code element speed is greatly reduced compared with the traditional optical amplitude modulation method, and the frequency spectrum efficiency is obviously improved. In addition, compared with amplitude modulation, optical phase modulation also has more excellent dispersion tolerance and polarization mode dispersion tolerance performance, and is more suitable for large-capacity and long-distance optical transmission systems.
In an optical phase modulation system, it is generally necessary to perform phase modulation using a lithium niobate modulator. The transmission characteristic or bias point of the lithium niobate modulator changes with temperature and stress due to the characteristics of the material of the lithium niobate modulator, so the bias point of the lithium niobate modulator must be relatively stable through a control technology. The technical scheme for controlling the bias point of the lithium niobate modulator commonly used at present comprises the following steps: 1) a pilot signal is additionally arranged on the lithium niobate modulator, then a backlight detection signal is sampled and a difference frequency signal contained in the backlight detection signal is filtered out, and when the difference frequency signal disappears, the lithium niobate modulator is locked to a normal bias point. 2) And directly sampling a backlight detection signal, and realizing the stability of the bias point of the lithium niobate modulator by analyzing the power of the output optical signal.
Whichever of the above schemes is adopted, the backlight detection signal needs to be sampled. The lithium niobate modulator is internally integrated with a photo detection diode (PD) for performing backlight signal detection on an optical signal output by the lithium niobate modulator and converting the optical signal into a current signal, which may also be referred to as a backlight detection unit. The trans-impedance amplifier converts the obtained current signal into a voltage signal, then sends the obtained voltage signal to the filter circuit, and finally sends the voltage signal to the analog-digital conversion unit for sampling. In order to ensure the quality of signal acquisition, the voltage signal output by the transimpedance amplifier must be ensured within a proper range.
At present, the existing gain control device for the transimpedance amplifier of the lithium niobate modulator is realized by a common resistor and a digital potentiometer, the common resistor realizes fixed gain, and the digital potentiometer provides adjustable gain adjustment for the transimpedance amplifier. Because the responsivity range of the PD of the lithium niobate modulator of the same manufacturer is wide, and in addition, the responsivity ranges of the PDs of the lithium niobate modulators of different manufacturers are not overlapped. Therefore, if the existing gain control device of the transimpedance amplifier of the lithium niobate modulator is adopted, in order to cover the response range of the PD of the lithium niobate modulator of the same manufacturer and be compatible with the lithium niobate modulators of different manufacturers, the common resistor needs to be replaced frequently to change the fixed gain, so that the manufacturing cost of the product is increased invisibly, and the production efficiency of the product is low.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a device and a method for controlling gain of a transimpedance amplifier of a lithium niobate modulator, wherein the resistor is selected in a PD responsivity range in a self-adaptive manner, and frequent replacement of the resistor is not required, so that the manufacturing cost of the product is reduced, and the production efficiency of the product is improved.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a lithium niobate modulator transimpedance amplifier gain control device, the device comprising:
the range selection unit is connected with the lithium niobate modulator and is used for acquiring the responsivity range of the PD in the lithium niobate modulator in different working states;
the resistor array unit is connected with the range selection unit and is used for being matched with the range selection unit, and a signal is output to the trans-impedance amplifier after the corresponding resistor is self-adaptively selected according to the responsivity range of the PD acquired from the range selection unit;
and the variable gain control unit is connected with the transimpedance amplifier and is used for amplifying the voltage signal output by the transimpedance amplifier.
Wherein, the device still includes: a fixed gain unit and a control unit; wherein,
the fixed gain unit is connected with the variable gain control unit and is used for amplifying the voltage signal output by the variable gain unit;
the control unit is connected with the fixed gain unit and used for sampling the voltage signal output by the fixed gain unit for processing and storing the working state of the range selection unit when the state is calibrated.
The range selection unit is further used for working in a calibrated working state; the operating state of the range selection unit is controlled by the cooperative use of the variable gain control unit and the control unit.
The resistor array unit is further used for correspondingly selecting different resistors according to the determined PD responsivity range after determining the corresponding PD responsivity range according to the currently calibrated working state of the range selection unit.
The control unit is further used for recording the currently calibrated working state of the range selection unit when the output voltage of the variable gain control unit can be adjusted to be half of the reference voltage of the sampling circuit in the control unit under the condition of pre-calibrating one working state of the range selection unit; when the output voltage of the variable gain unit cannot be adjusted to be half of the reference voltage of the sampling circuit in the control unit, the range selection unit is switched to another state, then the gain of the variable gain unit is adjusted, the output voltage of the variable gain unit is made to be half of the reference voltage of the sampling circuit in the control unit, the current working state of the range selection unit is used as a calibrated working state, and the calibrated working state is recorded.
A method for controlling the gain of a lithium niobate modulator trans-impedance amplifier comprises the following steps: the range selection unit acquires the responsivity range of the PD in the lithium niobate modulator in different working states; the resistor array unit adaptively selects a corresponding resistor according to the responsivity range of the PD acquired from the range selection unit and outputs a signal to the trans-impedance amplifier; the variable gain control unit amplifies the voltage signal output by the trans-impedance amplifier.
Wherein, the method also comprises: the range selection unit works in a calibrated working state, and the working state of the range selection unit is controlled by the cooperation of the variable gain control unit and the control unit.
Wherein, the method also comprises: after the resistor array unit determines the corresponding range of the PD responsivity according to the currently calibrated working state of the range selection unit, different resistors are correspondingly selected according to the determined responsivity range.
Wherein, the working state is controlled by the cooperation of the variable gain control unit and the control unit, and specifically comprises:
setting the optical power of the output signal of the lithium niobate modulator, and calibrating one working state of the range selection unit in advance;
when the output voltage of the variable gain control unit can be adjusted to be half of the reference voltage of the sampling circuit in the control unit, recording the current calibrated working state of the range selection unit into the control unit;
when the output voltage of the variable gain unit cannot be adjusted to be half of the reference voltage of the sampling circuit in the control unit, the range selection unit is switched to another state, then the gain of the variable gain unit is adjusted, the output voltage of the variable gain unit is made to be half of the reference voltage of the sampling circuit in the control unit, and the current working state of the range selection unit is used as a calibrated working state and recorded in the control unit.
In the device, a range selection unit connected with the lithium niobate modulator is used for acquiring the responsivity range of the PD in the lithium niobate modulator in different working states; the resistor array unit is connected with the range selection unit and is used in cooperation with the range selection unit, and the resistor array unit is used for adaptively selecting the corresponding resistor and outputting a signal to the trans-impedance amplifier according to the responsivity range of the PD acquired from the range selection unit; and the variable gain control unit is connected with the transimpedance amplifier and is used for amplifying the voltage signal output by the transimpedance amplifier.
The invention is different from the prior art, adopts a resistance which is self-adaptively selected according to the PD responsivity range instead of a fixed resistance, namely the resistance is variable, so that the resistance does not need to be frequently replaced.
Drawings
FIG. 1 is a schematic diagram of a functional unit structure according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of the apparatus of the present invention;
FIG. 3 is a schematic diagram of an in-phase proportional amplifier circuit of the fixed gain unit of FIG. 2;
FIG. 4 is a flowchart illustrating an example of obtaining variable resistance values in a resistor array unit according to the method of the present invention;
FIG. 5 is a flow chart of an example of the operating state of the calibration range selection unit of the method of the present invention.
Detailed Description
The basic idea of the invention is: in the device, a range selection unit connected with a lithium niobate modulator is used for acquiring the responsivity range of the PD in the lithium niobate modulator in different working states; the resistor array unit is connected with the range selection unit and is used in cooperation with the range selection unit, and the resistor array unit is used for adaptively selecting the corresponding resistor and outputting a signal to the trans-impedance amplifier according to the responsivity range of the PD acquired from the range selection unit; and the variable gain control unit is connected with the transimpedance amplifier and is used for amplifying the voltage signal output by the transimpedance amplifier.
A lithium niobate modulator trans-impedance amplifier gain control device mainly comprises the following contents:
the device mainly includes: the device comprises a range selection unit, a resistance array unit and a variable gain control unit; the range selection unit is used for acquiring the responsivity range of the PD in the lithium niobate modulator in different working states; the resistor array unit is used for being matched with the range selection unit, and adaptively selects corresponding resistors according to the responsivity range of the PD acquired from the range selection unit. The variable gain control unit is used for amplifying the voltage signal output by the trans-impedance amplifier.
That is to say, the range selection unit and the resistor array unit which are used cooperatively can adaptively and correspondingly select different resistors according to different responsivity ranges of the PDs in the lithium niobate modulator, so that on the basis of meeting the requirements of covering the responsivity range of the PDs of the lithium niobate modulator of the same manufacturer and being compatible with the lithium niobate modulators of different manufacturers, the requirements of frequently replacing the common resistors according to the different responsivity ranges of the PDs of the lithium niobate modulator due to the adoption of the common resistors in the prior art are not needed, and therefore, the requirements can be met without disassembling and installing any unit in the device, the manufacturing cost of the product is reduced, and the production efficiency of the product is improved.
It should be noted here that the range selection unit is connected to the lithium niobate modulator, the resistor array unit is connected to the range selection unit, the range selection unit and the resistor array unit used in combination achieve adaptive selection of the corresponding resistor according to the responsivity range of the PD and then output a signal to the transimpedance amplifier, so that the voltage signal output by the transimpedance amplifier can be changed, and the variable gain control unit is connected to the transimpedance amplifier and amplifies the voltage signal output by the transimpedance amplifier.
Furthermore, when the variable gain control unit is used for amplifying the voltage signal output by the transimpedance amplifier, the amplification factor can be adjusted in a digital control mode.
Further, the apparatus further comprises: the variable gain amplifier comprises a fixed gain unit and a control unit, wherein the fixed gain unit is connected with the variable gain control unit and is used for amplifying a voltage signal output by the variable gain unit. The control unit is connected with the fixed gain unit and used for sampling the voltage signal output by the fixed gain unit for processing and storing the working state of the range selection unit when the state is calibrated.
Furthermore, the range selection unit is used for working in a calibrated working state, and the working state of the range selection unit is controlled by the cooperation of the variable gain control unit and the control unit. Because the range selection unit is in different operating states, the corresponding ranges of PD responsivity are also different.
Here, the controlling of the operating state by the cooperative use of the variable gain control unit and the control unit specifically includes: under the condition of setting the optical power of the output signal of the lithium niobate modulator in the device, calibrating one working state of the range selection unit in advance, adjusting the output voltage of the variable gain control unit to be half of the reference voltage of a sampling circuit in the control unit, and if the output voltage can be adjusted, recording the current calibrated working state of the range selection unit into the control unit; if the output voltage of the variable gain unit cannot be adjusted to be half of the reference voltage of the sampling circuit in the control unit no matter how the gain of the variable gain unit is adjusted, the range selection unit is switched to another state, then the gain of the variable gain unit is adjusted, the output voltage of the variable gain unit is made to be half of the reference voltage of the sampling circuit in the control unit, and the working state of the range selection unit at the moment is taken as a calibrated working state and recorded in the control unit.
Further, the resistor array unit is further configured to select different resistors according to the determined responsivity range after determining the corresponding PD responsivity range according to the working state calibrated by the current range selection unit.
Here, the obtaining of the resistance value in the resistance array unit specifically includes: determining the value of one resistor of the resistor array unit according to the minimum value of the gain of the variable gain unit, the maximum value of the PD responsivity of the lithium niobate modulator among different manufacturers, the maximum value of the output optical power of the lithium niobate modulator, the fixed gain and the reference voltage of the analog-digital converter in the control unit; and determining the value of the other resistor of the resistor array unit according to the maximum value of the gain of the variable gain unit, the minimum value of the PD responsivity of the lithium niobate modulator among different manufacturers, the minimum value of the output optical power of the lithium niobate modulator, the fixed gain and the reference voltage of the analog-digital converter in the control unit.
A method for controlling the gain of a lithium niobate modulator trans-impedance amplifier mainly comprises the following steps:
the range selection unit acquires the responsivity range of the PD in the lithium niobate modulator in different working states; the resistor array unit adaptively selects a corresponding resistor according to the responsivity range of the PD acquired from the range selection unit and outputs a signal to the trans-impedance amplifier; the variable gain control unit amplifies the voltage signal output by the trans-impedance amplifier.
Furthermore, when the variable gain control unit amplifies the voltage signal output by the transimpedance amplifier, the amplification factor can be adjusted in a digital control mode.
Furthermore, the range selection unit works in a calibrated working state, and the working state of the range selection unit is controlled by the cooperation of the variable gain control unit and the control unit.
Further, the controlling of the operating state by the cooperation of the variable gain control unit and the control unit specifically includes: under the condition of setting the optical power of the output signal of the lithium niobate modulator in the device, calibrating one working state of the range selection unit in advance, adjusting the output voltage of the variable gain control unit to be half of the reference voltage of a sampling circuit in the control unit, and if the output voltage can be adjusted, recording the current calibrated working state of the range selection unit into the control unit; if the output voltage of the variable gain unit cannot be adjusted to be half of the reference voltage of the sampling circuit in the control unit no matter how the gain of the variable gain unit is adjusted, the range selection unit is switched to another state, then the gain of the variable gain unit is adjusted, the output voltage of the variable gain unit is made to be half of the reference voltage of the sampling circuit in the control unit, and the working state of the range selection unit at the moment is taken as a calibrated working state and recorded in the control unit.
Further, after the resistor array unit determines the corresponding range of the PD responsivity according to the working state calibrated by the current range selection unit, different resistors are selected correspondingly according to the determined range of the responsivity.
In summary, the core of the present invention is to expand the responsivity range of the PD of the lithium niobate modulator supported by the range selection unit and the resistor array unit, so that a plurality of lithium niobate modulators can be used without detaching and mounting any device, thereby improving the production efficiency.
The following describes the embodiments in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a functional unit structure of an embodiment of the apparatus, where the apparatus includes: the device comprises a PD of the lithium niobate modulator, a range selection unit, a resistor array unit, a variable gain control unit, a fixed gain unit and a control unit. The PD is arranged in the lithium niobate modulator and is used for sensing the optical signal output by the lithium niobate modulator and converting the optical signal into corresponding monitoring optical current I according to the output optical powerPD. The trans-impedance amplifier is used for converting the photocurrent signal into a voltage signal VTZ. The range selection unit and the resistor array unit are used in cooperation and are used for selecting different resistors according to the responsivity range of the PD so as to change the voltage signal V output by the trans-impedance amplifierTZThe numerical value of (c). A variable gain control unit for amplifying the voltage signal output by the transimpedance amplifier by an amplification factor of KTZThe amplification factor can be adjusted in a digital control manner. A fixed gain unit for amplifying the voltage signal output by the variable gain unit to obtain a voltage signal VOUT. And the control unit is used for sampling the voltage signal output by the fixed gain unit for processing, and simultaneously calibrating the working state of the time range selection unit by the storage device.
Fig. 2 is a schematic circuit structure diagram of an embodiment of the apparatus of the present invention, where a portion indicated by a dashed line frame in fig. 2 corresponds to a functional unit in fig. 1, and is a specific implementation of the functional unit in fig. 1, and the range selection unit is implemented by a digitally controlled digital control analog switch, and the switching of the working state calibrated by the range selection unit is completed through a digital control signal. The switch is one-to-many selectable.
The resistor array unit is realized by two parallel common resistors RFLAnd RFH，RFLAnd RFHThe input ends of the two-way amplifier are respectively connected with the digital control analog switches, and the output ends of the two-way amplifier are connected together and connected to the output end of the transimpedance amplifier.
The variable gain control unit is realized by a digital-to-analog converter and is used for amplifying the output voltage signal of the trans-impedance amplifier, and the amplification coefficient is KTZAmplification factor KTZThe adjustment can be performed in a digital control manner. Output voltage V of trans-impedance amplifierTZA reference voltage terminal connected to the digital-to-analog converter, an output voltage signal V of the digital-to-analog converterDACIs connected to a fixed gain unit. By adopting the connection method, the following steps are provided:
wherein DAC is the value written by digital-to-analog converter, and the range is that DAC is more than or equal to 0 and less than or equal to 2N-1. In this embodiment, the gain range of the variable gain control unit is set as follows: k is more than or equal to 0.1TZ≤1。
The fixed gain unit is implemented by the in-phase proportional amplification circuit of the operational amplifier, which is shown in fig. 3.
And the control unit is used for sampling the voltage signal output by the fixed gain unit for processing, and simultaneously calibrating the working state of the time range selection unit by the storage device. The control unit is realized by an analog-digital converter and a controller, and the controller can be realized by an FPGA or a DSP. The FLASH unit inside the FPGA or the DSP can be used for storing the working state of the range selection unit when the device is calibrated.
According to the connection relationship of the units of the device of the present invention in FIG. 2, the voltage signal V is finally outputtedOUTAnd backlight current are:
VOUT＝IPDRFKTZKA；KTZan amplification factor, K, of the variable gain control unit when amplifying the voltage signal output from the transimpedance amplifierAFor a fixed gain, RFIs the value of the resistance in the resistor array unit, IPDFor monitoring the backlight current IPD。
Wherein, IPDThe relation with the optical signal power output by the lithium niobate modulator is as follows:
IPD＝PORSP；RSPis the responsivity of PD, POThe optical signal power of the optical signal output by the lithium niobate modulator.
In order to reduce the influence of the change of the sampling voltage on the analog-digital converter in the control unit, the invention outputs the voltage V finally by the deviceOUTSet at half the reference voltage of the analog-to-digital converter, i.e. VREF/2。
Fig. 4 is a flowchart illustrating an example of obtaining the variable resistance value in the resistor array unit according to the method of the present invention, which includes the following steps:
wherein R isSP(MAX)Is the maximum value of responsivity.
102, according to the maximum value of the gain of the variable gain unit, the minimum value of the PD responsivity of the lithium niobate modulator among different manufacturers, the minimum value of the output optical power of the lithium niobate modulator and the fixed gain KAAnd an analog-to-digital conversion unit reference voltage VREFR is calculated by the following formulaFHThe resistance value is calculated by the formula
Wherein R isSP(MIN)RSP(MAX)Is the minimum value of responsivity.
Fig. 5 is a flow chart showing an example of the operation state of the calibration range selecting unit of the method of the present invention, which includes the following steps:
step 201, setting optical power P of output signal of lithium niobate modulator in deviceO。
Step 202, setting a working state of the digital control analog switch, and continuously adjusting the value written into the digital-analog converter.
Step 203, outputting the voltage VOUTWhether the reference voltage of the sampling circuit in the control unit can be adjusted to be half of the reference voltage, if yes, step 204 is executed; otherwise, step 205 is performed.
And step 204, recording the working state of the digital control analog switch (namely the state of the switch control signal) into an FPGA of the control unit or a FLASH of the DSP, and ending the current process.
In step 205, no matter how the value written into the digital-to-analog converter is adjusted, the output voltage V cannot be adjustedOUTWhen the reference voltage of the sampling circuit in the control unit is adjusted to be half of the reference voltage, the digital control analog switch is switched to another state, and then the numerical value written in the digital-analog converter is adjusted to enable the digital control analog switch to output the voltage VOUTFor sampling circuit reference voltage in control unitAnd half.
Step 206, recording the working state of the digital control analog switch (i.e. the state of the switch control signal) into the FPGA of the control unit or the FLASH of the DSP, and ending the current flow.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (9)
1. A lithium niobate modulator transimpedance amplifier gain control device is characterized by comprising:
the range selection unit is connected with the lithium niobate modulator and is used for acquiring the responsivity range of the PD in the lithium niobate modulator in different working states;
the resistor array unit is connected with the range selection unit and is used for being matched with the range selection unit, and a signal is output to the trans-impedance amplifier after the corresponding resistor is self-adaptively selected according to the responsivity range of the PD acquired from the range selection unit;
and the variable gain control unit is connected with the transimpedance amplifier and is used for amplifying the voltage signal output by the transimpedance amplifier.
2. The apparatus of claim 1, further comprising: a fixed gain unit and a control unit; wherein,
the fixed gain unit is connected with the variable gain control unit and is used for amplifying the voltage signal output by the variable gain unit;
the control unit is connected with the fixed gain unit and used for sampling the voltage signal output by the fixed gain unit for processing and storing the working state of the range selection unit when the state is calibrated.
3. The device according to claim 1 or 2, characterized in that the range selection unit is further adapted to operate in a nominal operating state; the operating state of the range selection unit is controlled by the cooperative use of the variable gain control unit and the control unit.
4. The apparatus of claim 3, wherein the resistor array unit is further configured to select different resistors according to the determined range of PD responsivity after determining the corresponding range of PD responsivity according to the currently calibrated operating state of the range selecting unit.
5. The apparatus of claim 3, wherein the control unit is further configured to, in the case of pre-calibrating one of the operating states of the range selection unit, record the currently calibrated operating state of the range selection unit when the output voltage of the variable gain control unit can be adjusted to be half of the reference voltage of the sampling circuit in the control unit; when the output voltage of the variable gain unit cannot be adjusted to be half of the reference voltage of the sampling circuit in the control unit, the range selection unit is switched to another state, then the gain of the variable gain unit is adjusted, the output voltage of the variable gain unit is made to be half of the reference voltage of the sampling circuit in the control unit, the current working state of the range selection unit is used as a calibrated working state, and the calibrated working state is recorded.
6. A method for controlling the gain of a lithium niobate modulator trans-impedance amplifier is characterized by comprising the following steps: the range selection unit acquires the responsivity range of the PD in the lithium niobate modulator in different working states; the resistor array unit adaptively selects a corresponding resistor according to the responsivity range of the PD acquired from the range selection unit and outputs a signal to the trans-impedance amplifier; the variable gain control unit amplifies the voltage signal output by the trans-impedance amplifier.
7. The method of claim 6, further comprising: the range selection unit works in a calibrated working state, and the working state of the range selection unit is controlled by the cooperation of the variable gain control unit and the control unit.
8. The method of claim 7, further comprising: after the resistor array unit determines the corresponding range of the PD responsivity according to the currently calibrated working state of the range selection unit, different resistors are correspondingly selected according to the determined responsivity range.
9. The method according to claim 7, wherein the operating state is controlled by the cooperative use of the variable gain control unit and the control unit, and specifically comprises:
setting the optical power of the output signal of the lithium niobate modulator, and calibrating one working state of the range selection unit in advance;
when the output voltage of the variable gain control unit can be adjusted to be half of the reference voltage of the sampling circuit in the control unit, recording the current calibrated working state of the range selection unit into the control unit;
when the output voltage of the variable gain unit cannot be adjusted to be half of the reference voltage of the sampling circuit in the control unit, the range selection unit is switched to another state, then the gain of the variable gain unit is adjusted, the output voltage of the variable gain unit is made to be half of the reference voltage of the sampling circuit in the control unit, and the current working state of the range selection unit is used as a calibrated working state and recorded in the control unit.
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| Application Number | Priority Date | Filing Date | Title |
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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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Cited By (4)
| 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 |
| 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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| 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 |
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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 |
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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 |
|---|---|
| WO2012159420A1 (en) | 2012-11-29 |
| CN102195583B (en) | 2016-01-20 |
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