CN103346842B - Control feedback control system and the method for double; two parallel MZM modulator output intensity - Google Patents
Control feedback control system and the method for double; two parallel MZM modulator output intensity Download PDFInfo
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- CN103346842B CN103346842B CN201310228915.3A CN201310228915A CN103346842B CN 103346842 B CN103346842 B CN 103346842B CN 201310228915 A CN201310228915 A CN 201310228915A CN 103346842 B CN103346842 B CN 103346842B
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Abstract
A kind of feedback control system controlling double; two parallel MZM modulator output intensity of disclosure and method, the input of its fiber coupler connects the outfan of double; two parallel MZM modulator, the input of light-receiving assembly is connected with the secondary outfan of fiber coupler, and the outfan of light-receiving assembly is connected with the input of A/D converter；2 outfans of A/D converter connect the input of digital comparator and memorizer respectively, the outfan of memorizer is connected with another input of digital comparator, the outfan of digital comparator is connected with the input of microprocessor, and the outfan of microprocessor connects the power end of double; two parallel MZM modulator through D/A converter.The Output optical power of double; two parallel MZM modulator can be carried out monitor in real time by the present invention, and controls manipulator by controlling system feedback signal so that output is constant, and systematic function is optimum.
Description
Technical field
The present invention relates to microwave photon link technology, particularly relate to a kind of feedback control system controlling double; two parallel MZM modulator output intensity and method.
Background technology
Along with developing rapidly of Internet business and the Interactive multimedia services such as IPTV, video request program (VOD), wireless communication system is developed into a brand-new stage by traditional voice service service.People are in the urgent need at any time and any place and can provide simple, the reliable and cheap radio communication service of any media.Along with being continuously increased of user and bandwidth demand, existing available radio spectrum resources will exhaust soon, and therefore broadband wireless communication technique must be expanded to higher frequency.And in fiber optic communication systems, the optical fiber cable laid is underutilized, and there are substantial amounts of bandwidth resources and leaves unused, how to utilize cheap optical cable to leave unused bandwidth resources fully, solve the problem that radio band is nervous, become the key accelerating global communication technical development.According to Ministry of National Defence of Australia, the dynamic range of microwave photon link and loss have reached the requirement of electronic warfare, and are applied in the receiver of a series of electronic warfare.In electronic countermeasure and electronic support system, owing to microwave signal is bigger by coaxial cable or waveguide loss, the antenna causing these electronic systems must close on its transmitter or receiver, and this just seriously limits the function of electronic countermeasure and electronic support system.The introducing of microwave photon link, can make electronic countermeasure spatially separate at a distance with their antenna with electronic support system, even if antenna is attacked by such antiradiation missile, also cannot damage whole electronic system.Utilizing microwave photon link a microwave signal to be launched with multiple remote antennas, receiver can also accept microwave signal in the same way, can set up the radio frequency network of tridimensional electronic antagonism, electronic support system.Therefore based on the microwave photon system of fiber-optic transfer, there is in electronic warfare field great using value and prospect.
In microwave photon system, owing to microwave signal is modulated on light wave by needs, the performance of electrooptic modulator and the characteristic of character decision systems, the wherein dynamic range of electrooptic modulator nonlinear property microwave photon system；The existence of the non-linear intermodulation signal caused so that the dynamic range of system reduces, and needs in actual applications to take certain technological means, intermodulation signal is suppressed or eliminates, to increase the dynamic range of system；And form the material of electrooptic modulator, such as the accumulation of heat that Lithium metaniobate produces when long-time applying voltage, there is small change in the refractive index making material, and then the Output optical power of manipulator can produce drift due to variations in temperature that this accumulation of heat causes, the duty making system changes, hydraulic performance decline.
Summary of the invention
To be solved by this invention is double; two parallel MZM(mach zhenders) accumulation of heat that produces because applying voltage for a long time of manipulator and the Output optical power that causes manipulator produces drift, duty changes and the problem such as hydraulic performance decline, it is provided that a kind of feedback control system controlling double; two parallel MZM modulator output intensity and method.
For solving the problems referred to above, the present invention is achieved by the following scheme:
Control the feedback control system of double; two parallel MZM modulator output intensity, be mainly made up of fiber coupler, light-receiving assembly, A/D converter, digital comparator, memorizer, microprocessor and D/A converter；Wherein the input of fiber coupler connects the outfan of double; two parallel MZM modulator, the double; two parallel MZM modulator of main outfan output of this fiber coupler normally export optical signal, the monitoring optical signal of the double; two parallel MZM modulator of secondary outfan output；The input of light-receiving assembly is connected with the secondary outfan of fiber coupler, and the outfan of light-receiving assembly is connected with the input of A/D converter；2 outfans of A/D converter connect the input of digital comparator and memorizer respectively, the outfan of memorizer is connected with another input of digital comparator, the outfan of digital comparator is connected with the input of microprocessor, and the outfan of microprocessor connects the power end of double; two parallel MZM modulator through D/A converter.
In said system, another road outfan of described microprocessor is also connected with memorizer.
In said system, described light-receiving assembly is connected to form by photodetector and trans-impedance amplifier, wherein the input of photodetector is connected with fiber coupler, and the outfan of photodetector is connected with the input of trans-impedance amplifier, and the outfan of trans-impedance amplifier is connected with A/D converter.
In said system, described microprocessor is single-chip microcomputer or ARM chip.
Based on the feedback controlling double; two parallel MZM modulator output intensity of said system, comprise the steps:
1. at the fiber coupler of output one 1:99 of termination of double; two parallel MZM modulator, obtain monitoring optical signal by this fiber coupler branch and send into fiber coupler；
2. the monitoring optical signal of input is converted to voltage signal and sends into A/D converter by light-receiving assembly；
3. the voltage signal of input is converted to digital signal by A/D converter, and the digital signal of output is divided into two-way, a road input digital comparator, another road input store；
4. microprocessor sends control signal at the beginning of running, and is the state allowing storage memory device, and the digital signal exported by A/D converter preserves in memory, and as nominal value, storage terminates；
5. it is poor to compare in the nominal value input digital comparator of storage in real time digital signal and memorizer, obtains the difference CZ of real time digital signal and nominal value；
6. by difference CZ input microprocessor, microprocessor regulates computing by PID, obtains digital regulating signal one group suitable；
7. this group digital regulating signal converts the just bias voltage V needed for double; two parallel MZM modulator to through D/A converter1, V2, V3The power end of the double; two parallel MZM modulator of rear feeding, so that the output intensity of double; two parallel MZM modulator is consistent with initial value.
In said method, still further comprise microprocessor and real-time difference CZ and/or real-time digital are regulated the step carrying out storing in signal feeding memorizer.
In said method, light-receiving assembly is first converted monitoring optical signal to photo-signal by photodetector, is then converted photo-signal to voltage signal by trans-impedance amplifier again.
Compared with prior art, the Output optical power of double; two parallel MZM modulator can be carried out monitor in real time by the present invention, and controls manipulator by controlling system feedback signal so that output is constant, and systematic function is optimum.
Accompanying drawing explanation
Fig. 1 is the feedback control system block diagram controlling double; two parallel MZM modulator output intensity.
Fig. 2 is the application principle figure of feedback control system shown in Fig. 1.
Fig. 3 is microprocessor internal flow chart.
Detailed description of the invention
A kind of feedback control system controlling double; two parallel MZM modulator output intensity, as it is shown in figure 1, it is mainly made up of fiber coupler, light-receiving assembly, A/D converter, digital comparator, memorizer, microprocessor and D/A converter.Wherein the input of fiber coupler connects the outfan of double; two parallel MZM modulator, the double; two parallel MZM modulator of main outfan output of this fiber coupler normally export optical signal, the monitoring optical signal of the double; two parallel MZM modulator of secondary outfan output.The input of light-receiving assembly is connected with the secondary outfan of fiber coupler, and the outfan of light-receiving assembly is connected with the input of A/D converter.2 outfans of A/D converter connect the input of digital comparator and memorizer respectively, the outfan of memorizer is connected with another input of digital comparator, the outfan of digital comparator is connected with the input of microprocessor, and the outfan of microprocessor connects the power end of double; two parallel MZM modulator through D/A converter.
Fiber coupler obtains monitoring optical signal by branch from the optical signal that double; two parallel MZM modulator export.In the present embodiment, selected fiber coupler is the fiber coupler of 1:99.
Light-receiving assembly, for being converted into voltage signal by the modulation optical signal that double; two parallel MZM modulator export.In the present embodiment, light-receiving assembly is connected to form by photodetector and trans-impedance amplifier, wherein the input of photodetector is connected with fiber coupler, and the outfan of photodetector is connected with the input of trans-impedance amplifier, and the outfan of trans-impedance amplifier is connected with A/D converter.
A/D converter, is converted into digital signal by the analog voltage signal that light-receiving assembly exports.
Memorizer, under microprocessor instruction control, preserves the digital signal of A/D converter output as nominal value.Additionally, in order to enable the state of running is inquired about, described memorizer is also connected with another road outfan of microprocessor.
Comparator, real time digital signal and preservation nominal value in a register to A/D converter output compare, and send comparative result to microprocessor.
Microprocessor, controls storage and the clearing of memory data the comparative result according to comparator output, adopts pid algorithm to produce digital regulating signal one group suitable.In the present embodiment, described microprocessor is single-chip microcomputer or ARM chip.
D/A converter, completes the digital-to-analogue conversion of the digital regulating signal of microprocessor output, produces disclosure satisfy that the voltage of the full span of control of direct current biasing of double; two parallel MZM modulator.
What above-mentioned feedback control system realized controls the feedback of double; two parallel MZM modulator output intensity, comprises the steps:
1. at the fiber coupler of output one 1:99 of termination of double; two parallel MZM modulator, obtain monitoring optical signal by this fiber coupler branch and send into fiber coupler.
2. the monitoring optical signal of input is converted to voltage signal and sends into A/D converter by light-receiving assembly.Light-receiving assembly is first converted monitoring optical signal to photo-signal by photodetector, is then converted photo-signal to voltage signal by trans-impedance amplifier again.
3. the voltage signal of input is converted to digital signal by A/D converter, and the digital signal of output is divided into two-way, a road input digital comparator, another road input store.
4. microprocessor sends control signal at the beginning of running, and is the state allowing storage memory device, and the digital signal exported by A/D converter preserves in memory, and as nominal value, storage terminates.
5. in real time digital signal and memorizer, the nominal value input digital comparator of storage compares poor, obtains the difference CZ of real time digital signal and nominal value.
6. by difference CZ input microprocessor, microprocessor regulates computing by PID, obtains digital regulating signal one group suitable.
7. this group digital regulating signal converts the just bias voltage V needed for double; two parallel MZM modulator to through D/A converter1, V2, V3The power end of the double; two parallel MZM modulator of rear feeding, so that the output intensity of double; two parallel MZM modulator is substantially consistent with initial value, it is ensured that system can stable operation.
The detailed process following (referring to Fig. 2) that double; two parallel MZM modulator are controlled by the feedback control system of the double; two parallel MZM modulator output intensity of this control:
A) the sub-manipulator MZM-1 of double; two parallel MZM modulator is loaded with RF/Microwave signal and DC offset voltage simultaneously, more it is easily generated temperature accumulation effect relative to other sub-manipulators loading DC offset voltage, causes that the refractive index of the Lithium metaniobate material of this sub-manipulator is more easy to generation minor variations.Therefore, first microprocessor regulates the DC offset voltage of MZM-1.
B) first microprocessor regulates the DC offset voltage of MZM-1, adopts pid algorithm to carry out, and specific algorithm flow chart is shown in Fig. 3, makes output intensity close to initial value by regulating the DC offset voltage of MZM-1, meets system requirements as far as possible；
C) as regulated the DC offset voltage of MZM-1, the output intensity of double; two parallel MZM modulator still suffers from relatively large deviation with initial value, it is impossible to meet system requirements, then use pid algorithm that the DC offset voltage of MZM-2 is adjusted, make error amount reduce further；
D) adopt pid algorithm to be adjusted MZM-3, make error amount reduce, reach requirement.
Description by above implementation, skilled artisan can be clearly understood that the present invention and can realize by hardware and software platform, based on such understanding, the contribution of background technology can be embodied by technical scheme with the form of software and hardware product.The components and parts of this hardware product can be commercially available on the market, by building and can perform in conjunction with software product the method described in some part of each embodiment of the present invention or embodiment.
The above, be only presently preferred embodiments of the present invention, is not intended to limit protection scope of the present invention.
Claims (6)
1. control the feedback of double; two parallel MZM modulator output intensity, it is characterized in that, comprise the steps:
1. at the fiber coupler of output one 1:99 of termination of double; two parallel MZM modulator, obtain monitoring optical signal by this fiber coupler branch and send into fiber coupler；
2. the monitoring optical signal of input is converted to voltage signal and sends into A/D converter by light-receiving assembly；
3. the voltage signal of input is converted to digital signal by A/D converter, and the digital signal of output is divided into two-way, a road input digital comparator, another road input store；
4. microprocessor sends control signal at the beginning of running, and is the state allowing storage memory device, and the digital signal exported by A/D converter preserves in memory, and as nominal value, storage terminates；
5. in real time digital signal and memorizer, the nominal value input digital comparator of storage compares poor, obtains the difference CZ of real time digital signal and nominal value；
6. by difference CZ input microprocessor, microprocessor regulates computing by PID, obtains digital regulating signal one group suitable；
7. this group digital regulating signal converts the just bias voltage V needed for double; two parallel MZM modulator to through D/A converter1, V2, V3The power end of the double; two parallel MZM modulator of rear feeding, so that the output intensity of double; two parallel MZM modulator is consistent with initial value；Namely
First, the DC offset voltage V of the sub-manipulator MZM-1 of double; two parallel MZM modulator is regulated1, adopt pid algorithm, by regulating the DC offset voltage V of MZM-11Make output intensity close to initial value, make error amount reduce；
Then, the DC offset voltage V of the sub-manipulator MZM-2 of double; two parallel MZM modulator is regulated2, adopt pid algorithm, by regulating the DC offset voltage V of MZM-22Make output intensity further to initial value, make error amount reduce further；
Finally, the DC offset voltage V of the sub-manipulator MZM-3 of double; two parallel MZM modulator is regulated3, adopt pid algorithm, by regulating the DC offset voltage V of MZM-33Make output intensity close to initial value, make error amount further reduce, reach requirement.
2. the feedback of the double; two parallel MZM modulator output intensity of control according to claim 1, it is characterized in that, step 2. in, light-receiving assembly is first converted monitoring optical signal to photo-signal by photodetector, is then converted photo-signal to voltage signal by trans-impedance amplifier again.
3. realize the feedback control system controlling double; two parallel MZM modulator output intensity of feedback described in claim 1, it is characterised in that: it is made up of fiber coupler, light-receiving assembly, A/D converter, digital comparator, memorizer, microprocessor and D/A converter；Wherein the input of fiber coupler connects the outfan of double; two parallel MZM modulator, the double; two parallel MZM modulator of main outfan output of this fiber coupler normally export optical signal, the monitoring optical signal of the double; two parallel MZM modulator of secondary outfan output；The input of light-receiving assembly is connected with the secondary outfan of fiber coupler, and the outfan of light-receiving assembly is connected with the input of A/D converter；2 outfans of A/D converter connect the input of digital comparator and memorizer respectively, the outfan of memorizer is connected with another input of digital comparator, the outfan of digital comparator is connected with the input of microprocessor, and the outfan of microprocessor connects the power end of double; two parallel MZM modulator through D/A converter.
4. the feedback control system of the double; two parallel MZM modulator output intensity of control according to claim 3, it is characterised in that: another road outfan of described microprocessor is also connected with memorizer.
5. the feedback control system controlling double; two parallel MZM modulator output intensity according to claim 3 or 4, it is characterized in that: described light-receiving assembly is connected to form by photodetector and trans-impedance amplifier, wherein the input of photodetector is connected with fiber coupler, the outfan of photodetector is connected with the input of trans-impedance amplifier, and the outfan of trans-impedance amplifier is connected with A/D converter.
6. the feedback control system controlling double; two parallel MZM modulator output intensity according to claim 3 or 4, it is characterised in that: described microprocessor is single-chip microcomputer or ARM chip.
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| CN103684584A (en) * | 2014-01-03 | 2014-03-26 | 上海长跃通信技术有限公司 | Optical fiber transmission quality automatic-monitoring system |
| CN104363047A (en) * | 2014-10-09 | 2015-02-18 | 中国科学院半导体研究所 | Light vector network analyzer system based on double-channel Mach-Zehnder modulator |
| CN109856890B (en) * | 2019-03-25 | 2020-08-04 | 上海交通大学 | Automatic bias control method for parallel demultiplexing module of optical analog-to-digital conversion system |
| WO2021169756A1 (en) | 2020-02-25 | 2021-09-02 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN114070413B (en) * | 2020-07-31 | 2023-03-14 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN111342906A (en) * | 2020-03-20 | 2020-06-26 | 中国电子科技集团公司第五十四研究所 | MZM-based optical communication receiver optical power stabilizing system |
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| CN102710336A (en) * | 2012-05-22 | 2012-10-03 | 武汉电信器件有限公司 | Working point control device and working point control method applied in MZ (Mach-Zehnder) modulator |
| CN102783054A (en) * | 2010-02-25 | 2012-11-14 | 三菱电机株式会社 | Optical transmitter |
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| CN101650478A (en) * | 2009-09-10 | 2010-02-17 | 上海华魏光纤传感技术有限公司 | Electro-optical modulator assembly and method for realizing stable extinction ratio |
| CN102783054A (en) * | 2010-02-25 | 2012-11-14 | 三菱电机株式会社 | Optical transmitter |
| CN102710336A (en) * | 2012-05-22 | 2012-10-03 | 武汉电信器件有限公司 | Working point control device and working point control method applied in MZ (Mach-Zehnder) modulator |
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