CN101599766B - Differential-mode component extraction method of optical signal and device thereof - Google Patents
Differential-mode component extraction method of optical signal and device thereof Download PDFInfo
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- CN101599766B CN101599766B CN 200910052802 CN200910052802A CN101599766B CN 101599766 B CN101599766 B CN 101599766B CN 200910052802 CN200910052802 CN 200910052802 CN 200910052802 A CN200910052802 A CN 200910052802A CN 101599766 B CN101599766 B CN 101599766B
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- 239000006185 dispersion Substances 0.000 abstract 2
- 230000005622 photoelectricity Effects 0.000 description 12
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Abstract
The invention discloses a differential-mode component extraction method of optical signal, wherein the optical signal comprises a first optical signal and a second optical signal, and the method includes the following steps: obtaining the voltage signals of the first signal and the second signal; then obtaining the first voltage signal and the second voltage signal; obtaining the dispersion of the first voltage signal and the second voltage signal; adjusting the first voltage signal and the second voltage signal according to the dispersion; and obtaining the differential-mode component of thefirst voltage signal and the second voltage signal. The common-mode component of the voltage signal in the two photoelectric paths is extracted firstly; and the micro-controller compares the common-mode component and uses the digital potentiometer to adjust the voltage signal according to the differential value. The differential-mode component of the voltage signal is then obtained according to the differential amplification circuit. Intelligent adjustment can be carried out for the voltage signal on the photoelectric path, and the differential-mode signal is more accurately extracted.
Description
Technical field
The present invention relates to field of intelligent control technology, relate in particular to a kind of difference mode signal extraction element of eliminating the common mode signal attenuation factor in the optical fiber.
Background technology
Tell the light of two-way symmetry after in the general interferometer that adopts in optical fiber vibration sensing field, selecting for use 3 * 3 couplers that the reverberation in the detection optical fiber is interfered, be converted to voltage signal through optical-electrical converter again, extract useful signal afterwards.Comprising common mode component and difference component in this two ways of optical signals.In actual applications, described difference component is actual useful signal.In the prior art, each road light signal is carried out the photoelectricity amplification do subtraction again, and then obtain differential signal, be illustrated in fig. 1 shown below.
This all is feasible as a rule, can eliminate common mode component (" A " in the formula " I1=A-b ") by above-mentioned transportation.For example, the consistent light that causes of optical cable splice loss, splice attenuation imports that the average light power size is identical symmetrically under the situation of laboratory or in application.
Yet in actual applications, environmental indexs such as the suffered pressure of optical fiber, stress temperature all were not quite similar during the decay of the loss of welding node, joint was particularly used in the open air, and this two-way average light power that all can cause being input to photodetector is inconsistent.Will make output signal whole drift occur so in actual applications, even it is saturated the output of differential amplifier circuit to occur.
Summary of the invention
In view of the above-mentioned defective of prior art, technical problem to be solved by this invention provides a kind of device that can extract difference mode signal more accurately.
For achieving the above object, the invention provides a kind of differential-mode component extraction method of light signal, described light signal comprises first light signal and second light signal.Described method comprises the steps: to obtain the voltage signal of described first light signal and second light signal, thereby obtains first voltage signal and second voltage signal; Obtain the residual quantity of described first voltage signal and second voltage signal; Regulate described first voltage signal and second voltage signal according to described residual quantity; Obtain the differential-mode component of described first voltage signal and second voltage signal.
Another aspect of the invention is a kind of differential-mode component extraction element of light signal, comprise first and second photodetectors that a pair of light signal converted to first and second voltage signals respectively, with and positive input terminal be connected with described first photodetector, its negative input end is connected with described second photo-detector, and the differential amplifier circuit of its output output differential-mode component, it is characterized in that, also comprise the digital regulation resistance and the controller that arrange between described photodetector and the described differential amplifier circuit, the residual quantity of described voltage signal is obtained in wherein said control, according to the residual quantity of described common mode component described voltage signal is regulated then.
The present invention at first extracts the common mode component of the voltage signal in the two-way photoelectricity path, by controller described common mode component is compared, and utilizes digital regulation resistance that described voltage signal is regulated according to residual quantity again.Afterwards, obtain the differential-mode component of described voltage signal again by differential amplifier circuit.Thus, can carry out intelligence to the voltage signal on the photoelectricity path and regulate, extract difference mode signal more accurately.
Description of drawings
Reference is description and the accompanying drawing of current preferred embodiment hereinafter, can understand the present invention and purpose and advantage best.
Fig. 1 is the schematic diagram of existing differential-mode component extraction element;
Fig. 2 is the schematic diagram of differential-mode component extraction element of the present invention.
Embodiment
With reference to description of drawings preferred embodiments of the present invention.
Extracting method according to differential-mode component of the present invention now is described.At first, the light signal that has common-mode signal and difference mode signal of the two-way symmetry that interferometer is spread out of by photodetector changes corresponding voltage signal into, thereby to first voltage signal and second voltage signal.After this, obtain the common mode component of described first and second voltage signals, thereby obtain first and second common mode components.Then, regulate described first and second voltage signals according to the difference of described first common mode component and second common mode component.Concrete, the bigger voltage signal of common mode component is decayed and regulated, identical until described two voltage signals.At last, obtain the differential-mode component of described first and second voltage signals through regulating.Should understand as those skilled in the art, also can gain and regulate the less voltage signal of common mode component.In addition, obtain described first voltage and second voltage by photoelectric sensing apparatus after, can amplify them.
Now illustrate according to difference mode signal extraction element of the present invention according to Fig. 2.
Fig. 2 shows the difference mode signal extraction element 100 of the preferred embodiment according to the present invention.As shown in Figure 2, difference mode signal extraction element 100 comprises the first photoelectricity path 10 and the second photoelectricity path 20.The first photoelectricity path 10 comprises photodetector 102 and first photoamplifier circuit 103.Similarly, the second photoelectricity path 20 comprises photodetector 202 and second photoamplifier circuit 203.
The light signal that comprises differential-mode component and common mode component that photodetector 102 and photodetector 202 are surveyed the two-way symmetry that interferometer 200 spreads out of respectively converts voltage signal to.In the present embodiment, establishing first voltage signal that photodetector 102 records is I1=A-b, and second voltage signal that photodetector 202 records is I2=μ (A-b), and wherein A is the common mode component in the light signal, and b is the differential-mode component of light signal.Because A is common mode component, b is differential-mode component, therefore, the common mode component A equal and opposite in direction of two ways of optical signals, phase place is identical, and differential-mode component b equal and opposite in direction, phase place is opposite.In addition, coefficient μ represents by environmental parameter, for example welding node loss, joint decay, the suffered pressure of optical fiber, stress temperature etc. in particularly using in the open air, the luminous power drift of the light signal that causes.Thus, photodetector 102 and photodetector 202 obtain first voltage signal and second voltage signal respectively.
Photodetector 102 and photodetector 202 also are connected with first photoamplifier circuit 103 and second photoamplifier circuit 203 respectively, thereby respectively with described first and second voltage signals input wherein.First photoamplifier circuit 103 and second photoamplifier circuit 203 amplify described first voltage and second voltage respectively, import positive input terminal and the negative input end of differential amplifier circuit 30 then respectively.
30 pairs of described first and second voltage signals through amplifying of differential amplifier circuit carry out subtraction, thereby remove the common mode component of first and second voltage signals, only keep difference mode signal wherein.After this, differential amplifier circuit 30 is exported the differential-mode component sum 2b of first and second voltage signals from its output, finish the extraction of differential-mode component.
In addition, the output of first photoamplifier circuit 103 and second photoamplifier circuit 203 also is connected with microcontroller SOC (system on a chip) SOC40 by common-mode signal collector 50, to export the common mode component A in described first and second voltage signals through amplifying to SOC (system on a chip) SOC40.In the present embodiment, common-mode signal collector 50 comprises low-pass filter circuit and analog to digital converter.Low-pass filter circuit is extracted as the common mode component of direct current signal, and analog to digital converter is converted to described common mode component digital signal and imports SOC (system on a chip) SOC40.Concrete, SOC (system on a chip) SOC40 obtains the numerical value μ A of second common mode component of the numerical value A of first common mode component of the described signal of telecommunication and the described signal of telecommunication 2.SOC (system on a chip) SOC40 is an example of controller.
Among the present invention, obtain the common mode component of voltage signal by low-pass filter circuit, again input SOC (system on a chip) SOC40 after analog-to-digital conversion.Should understand as those skilled in the art, also can directly sample to voltage signal, calculate the numerical value of common mode component after being transformed by the sampled result A/D of SOC (system on a chip) SOC40 then.
SOC (system on a chip) SOC40 calculates the residual quantity of described first common mode component and described second common mode component, thereby control described digital regulation resistance according to described residual quantity the described signal of telecommunication and the signal of telecommunication 2 is regulated.If described residual quantity is greater than preset range, the digital regulation resistance that SOC (system on a chip) SOC40 then controls on the bigger photoelectricity path of voltage signal is decayed to described voltage signal.Concrete, the μ that it is described first common mode component that SOC (system on a chip) SOC40 calculates described second common mode component doubly then controls second digital regulation resistance and makes described second voltage signal decay μ doubly, namely multiply by 1/B.If described residual quantity is within preset range, then SOC (system on a chip) SOC40 does not intervene.Should understand as those skilled in the art, except the bigger voltage signal of common mode component is decayed it being regulated, also can gain and to its adjusting to the less voltage signal of common mode component.In addition, in the present embodiment, on each photoelectricity path, namely the back level of each photoamplifier circuit is provided with two potential regulators respectively, certainly, also can be in SOC (system on a chip) SOC40 the integrated electronic position adjuster, respectively each voltage signal is regulated.
Thus, under second light signal drift μ situation doubly, the pass of the signal of telecommunication 2 and the described signal of telecommunication that exports the negative input end of differential amplifier circuit 30 from the described second photoelectricity path to is: common mode component A equal and opposite in direction, and phase place is identical, and differential-mode component b equal and opposite in direction, phase place is opposite.
In the present embodiment, SOC (system on a chip) SOC40 comes voltage signal is regulated according to the difference of common mode component, should understand as those skilled in the art, also can utilize peak detector to obtain the differential-mode component of described first and second voltage signals, obtain their residual quantity again, thereby supply with the residual quantity of differential-mode component, described voltage signal is regulated.
The second embodiment of the present invention is described below.
The structure of second embodiment and first embodiment are basic identical, and difference is that SOC (system on a chip) SOC40 also is connected with communication output port RS485 80.The difference that calculates the described signal of telecommunication and the described signal of telecommunication 2 as SOC (system on a chip) SOC40 is judged that then fiber-optic signal is in abnormality, thereby is sent diagnostic message by port 80 during greater than predetermined value.
In addition, the output of differential amplifier circuit 30 is connected with peak detector 60, and it is for detection of the peak value of the output signal of differential amplifier circuit 30.The output of peak detector 60 is connected with SOC (system on a chip) SOC40, testing result has been imported SOC (system on a chip) SOC40.Moreover, be in series with programmable gain amplifier (PGA) 70 between differential amplifier circuit 30 and the peak detector 60.PGA70 also is connected with SOC (system on a chip) SOC40, and the signal to receive its control to differential amplifier circuit 30 gains.Concrete, if SOC (system on a chip) SOC40 judges described peak value less than predetermined value, then SOC (system on a chip) SOC40 control PGA70 increases its multiplication factor, up to the output signal peak value of differential amplifier circuit 30 greater than predetermined value.
Above-described embodiment has following advantage.
1, the present invention at first extracts the common mode component of the voltage signal in the two-way photoelectricity path, by microcontroller described common mode component is compared, and utilizes digital regulation resistance that described voltage signal is regulated according to difference.Afterwards, obtain the differential-mode component of described voltage signal again by differential amplifier circuit.Thus, can carry out intelligence to the voltage signal on the photoelectricity path and regulate, extract difference mode signal more accurately.
2, difference mode signal extraction element according to the present invention also comprises peak detector and programming gain amplifier, reaches predetermined value with the peak value of guaranteeing the differential-mode component that described device is exported.
3, difference mode signal extraction element according to the present invention also comprises the communication output port, when described difference during greater than predetermined value, SOC (system on a chip) SOC judges that described device is in abnormality, then by described communication output port output diagnostic message, guarantees the stability of described difference mode signal extraction element.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or substantive characteristics, and the present invention can be with other forms, structure, layout, ratio, and realize with other elements, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (10)
1. the differential-mode component extraction method of a light signal, described light signal comprises first light signal and second light signal, it is characterized in that, first light signal that comprises differential-mode component and common mode component and second light signal that first photodetector and second photodetector will be surveyed the two-way symmetry that interferometer spreads out of respectively convert voltage signal to, and the differential-mode component extraction method of described light signal comprises the steps:
(a) obtain the voltage signal of described first light signal and second light signal, thereby obtain first voltage signal and second voltage signal;
(b) obtain the residual quantity of described first voltage signal and second voltage signal;
(c) regulate described first voltage signal and second voltage signal according to described residual quantity;
(d) obtain the differential-mode component of described first voltage signal and second voltage signal.
2. the method for claim 1 is characterized in that, described residual quantity is the residual quantity of the common mode component of described first voltage signal and second voltage signal, perhaps is the residual quantity of the differential-mode component of first voltage signal and second voltage signal.
3. method as claimed in claim 2, it is characterized in that, step (c) comprises and increases common mode component described in described first voltage signal and second voltage signal less or reduce bigger one of common mode component described in described first voltage signal and second voltage signal, perhaps comprises increasing less one of differential-mode component described in described first voltage signal and second voltage signal; Perhaps reduce bigger one of differential-mode component described in described first voltage signal and second voltage signal.
4. the method for claim 1 is characterized in that, step (a) comprises amplifies described first voltage signal and second voltage signal.
5. the differential-mode component extraction element of a light signal, comprise first and second photodetectors that a pair of light signal converted to first and second voltage signals respectively, with and positive input terminal be connected with described first photodetector, its negative input end is connected with described second photo-detector, and the differential amplifier circuit of its output output differential-mode component, it is characterized in that, also comprise the digital regulation resistance and the controller that arrange between described photodetector and the described differential amplifier circuit, wherein said controller obtains the residual quantity of described voltage signal, according to the residual quantity of the common mode component of described first voltage signal and second voltage signal described voltage signal is regulated then.
6. device as claimed in claim 5 is characterized in that, described residual quantity is the residual quantity of the common mode component of described first voltage signal and second voltage signal, perhaps is the residual quantity of the differential-mode component of described first voltage signal and second voltage signal.
7. device as claimed in claim 6, it is characterized in that, described adjusting comprises and increases common mode component described in described first voltage signal and second voltage signal less or reduce bigger one of common mode component described in described first voltage signal and second voltage signal, perhaps comprises increasing less one of differential-mode component described in described first voltage signal and second voltage signal; Perhaps reduce bigger one of differential-mode component described in described first voltage signal and second voltage signal.
8. device as claimed in claim 5 is characterized in that, also is connected with photoamplifier between described photodetector and the described differential amplifier circuit, to amplify the voltage signal that described photodetector obtains.
9. device as claimed in claim 5, it is characterized in that, the output of described differential amplifier circuit also is connected with peak detector and programming gain amplifier, and peak detector is connected with described controller respectively with the programming gain amplifier, and wherein said controller is controlled described programming gain amplifier according to the testing result of described peak detector the output of described differential amplifier circuit is regulated.
10. device as claimed in claim 5 is characterized in that, described controller also is connected with communication port, and when described residual quantity during greater than predetermined value, described controller is by described communication port output diagnostic signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1503476A (en) * | 2002-11-27 | 2004-06-09 | 株式会社东芝 | Optical signal receiving circuit and optical signal receiving semciconductor device |
| CN101335503A (en) * | 2007-06-28 | 2008-12-31 | 冲电气工业株式会社 | Preamplifier and light receiving device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7305190B2 (en) * | 2003-05-06 | 2007-12-04 | Vitesse Semiconductor Corporation | Optical dispersion correction in transimpedance amplifiers |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1503476A (en) * | 2002-11-27 | 2004-06-09 | 株式会社东芝 | Optical signal receiving circuit and optical signal receiving semciconductor device |
| CN101335503A (en) * | 2007-06-28 | 2008-12-31 | 冲电气工业株式会社 | Preamplifier and light receiving device |
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Inventor after: Zhang Dacheng Inventor after: Liu Liang Inventor after: Gao Wei Inventor after: Xi Gang Inventor after: Zhou Zhengxian Inventor after: Tong Fangxuan Inventor after: Li Hongkai Inventor after: Zhang Jing Inventor after: Li Peng Inventor before: Zhang Dacheng Inventor before: Liu Liang Inventor before: Gao Wei Inventor before: Xi Gang Inventor before: Zhou Zhengxian Inventor before: Tong Fangxuan |
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