CN103346842A - Feedback control system and method for controlling output light intensity of dual-parallel MZM modulator - Google Patents
Feedback control system and method for controlling output light intensity of dual-parallel MZM modulator Download PDFInfo
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- CN103346842A CN103346842A CN2013102289153A CN201310228915A CN103346842A CN 103346842 A CN103346842 A CN 103346842A CN 2013102289153 A CN2013102289153 A CN 2013102289153A CN 201310228915 A CN201310228915 A CN 201310228915A CN 103346842 A CN103346842 A CN 103346842A
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Abstract
The invention discloses a feedback control system and method for controlling output light intensity of a dual-parallel MZM modulator. The input end of an optical fiber coupler of the feedback control system is connected with an output end of the dual-parallel MZM modulator, the input end of an optical receiving module of the feedback control system is connected with a secondary output end of the optical fiber coupler, the output end of the optical receiving module is connected with the input end of an A/D converter, two output ends of the A/D converter are connected with one input end of a digital comparator and the input end of a memory respectively, the output end of the memory is connected with the other input end of the digital comparator, the output end of the digital comparator is connected with the input end of a microprocessor, and the output end of the microprocessor is connected with the power source end of the dual-parallel MZM modulator through a D/A converter. The feedback control system and method for controlling the output light intensity of the dual-parallel MZM modulator can carry out real-time monitoring on output optical power of the dual-parallel MZM modulator, signals are fed back to control the dual-parallel MZM modulator through the feedback control system, the output power can be constant, and system performance can be optimal.
Description
Technical field
The present invention relates to the microwave photon link technology, relate in particular to a kind of feedback control system and method for controlling two parallel MZM modulator output intensities.
Background technology
The developing rapidly of professional and IPTV, video request program interactive multimedia business such as (VOD) along with Internet, wireless communication system develops into a brand-new stage by traditional voice service service.People press at any time and any place and can provide simple, the reliable and cheap radio communication service of any medium.Along with the continuous increase of user and bandwidth demand, the existing radio spectrum resources of utilizing will exhaust soon, so broadband wireless communication technique must be expanded to higher frequency.And in optical fiber telecommunications system, the optical fiber cable of having laid is underutilized, and exists a large amount of bandwidth resources idle, how to utilize the idle bandwidth resources of cheap optical cable fully, solve the problem of radio band anxiety, become the key of accelerating the global communication technical development.According to Australian Ministry of National Defence, 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 warfares.In electronic countermeasures and electronic support system, because microwave signal is bigger by coaxial cable or waveguide loss, cause the antenna of these electronic systems to close on its transmitter or receiver, this has just seriously limited the function of electronic countermeasures and electronic support system.The introducing of microwave photon link can make electronic countermeasures and electronic support system spatially separate at a distance with their antenna, even antiradiation missile is attacked antenna like this, also can't damage whole electronic system.Utilize the microwave photon link microwave signal can be launched with a plurality of remote antennas, receiver also can be accepted microwave signal in the same way, can set up the radio frequency network of tridimensional electronic antagonism, electronic support system.Therefore the microwave photon system based on Optical Fiber Transmission has great application value and prospect in the electronic warfare field.
In the microwave photon system, owing to microwave signal need be modulated on the light wave, the characteristic of the performance of electrooptic modulator and character decision systems, wherein the electrooptic modulator nonlinear characteristic determines the dynamic range of microwave photon system; The existence of the non-linear intermodulation signal that causes makes the dynamic range of system reduce, and needs to take certain technological means in actual applications, intermodulation signal is suppressed or eliminates, with the dynamic range of increase system; And the material of composition electrooptic modulator, the accumulation of heat that when applying voltage for a long time, produces as lithium niobate, make the refractive index of material that small variation take place, and then the variations in temperature that the Output optical power of modulator can cause owing to this accumulation of heat produces drift, make the operating state of system change, performance descends.
Summary of the invention
To be solved by this invention is two parallel MZM(mach zhenders) modulator cause because of the accumulation of heat that applies voltage for a long time and produce that the Output optical power of modulator produces drift, operating state changes and performance under the degradation problem, a kind of feedback control system and method for controlling pair parallel MZM modulator output intensities is provided.
For addressing the above problem, the present invention is achieved by the following scheme:
The feedback control system of the two parallel MZM modulator output intensities of control mainly is made up of fiber coupler, optical fiber receive module, A/D converter, digital comparator, memory, microprocessor and D/A converter; Wherein the input of fiber coupler connects the output of two parallel MZM modulators, the normal output light signal of the two parallel MZM modulators of main output output of this fiber coupler, the monitor optical signal of the two parallel MZM modulators of inferior output output; The input of optical fiber receive module links to each other with the inferior output of fiber coupler, and the output of optical fiber receive module links to each other with the input of A/D converter; 2 outputs of A/D converter connect the input of digital comparator and memory respectively, the output of memory links to each other with another input of digital comparator, the output of digital comparator links to each other with the input of microprocessor, and the output of microprocessor connects the power end of two parallel MZM modulators through D/A converter.
In the said system, another road output of described microprocessor also links to each other with memory.
In the said system, described optical fiber receive module is connected to form by photodetector and trans-impedance amplifier, wherein the input of photodetector is connected with fiber coupler, and the output of photodetector links to each other with the input of trans-impedance amplifier, and the output of trans-impedance amplifier is connected with A/D converter.
In the said system, described microprocessor is single-chip microcomputer or ARM chip.
Feedback based on the two parallel MZM modulator output intensities of the control of said system comprises the steps:
1. at the fiber coupler of the 1:99 of output termination of two parallel MZM modulators, obtain the monitor optical signal along separate routes by this fiber coupler and send into fiber coupler;
2. optical fiber receive module converts the monitor optical signal of importing to voltage signal and sends into A/D converter;
3. A/D converter is converted to digital signal with the voltage signal of input, and the digital signal of output is divided into two-way, one tunnel input digit comparator, another road input store;
4. microprocessor sends control signal at the beginning of operation, is memory device the state that allows storage, and the digital signal of A/D converter output is kept in the memory, as nominal value, and the storage end;
5. it is poor to compare in the nominal value input digit comparator of storing in real time digital signal and the memory, obtains the difference CZ of real time digital signal and nominal value;
6. with difference CZ input microprocessor, microprocessor is regulated computing by PID, obtains the suitable digital regulating signal of a combination;
7. this group digital regulating signal converts two required just bias voltage V of parallel MZM modulator to through D/A converter
1, V
2, V
3After send into the power end of two parallel MZM modulators so that the output intensity of two parallel MZM modulators is consistent with initial value.
In the said method, comprise further that also microprocessor sends real-time difference CZ and/or real-time digital conditioning signal into the step of storing in the memory.
In the said method, optical fiber receive module converts the monitor optical signal to photo-signal by photodetector earlier, and then converts photo-signal to voltage signal by trans-impedance amplifier.
Compared with prior art, the present invention can monitor in real time to the Output optical power of two parallel MZM modulators, and by control system feedback signal control modulator, makes power output constant, the systematic function optimum.
Description of drawings
Fig. 1 is the feedback control system block diagram of the two parallel MZM modulator output intensities of control.
Fig. 2 is the application principle figure of feedback control system shown in Figure 1.
Fig. 3 is the microprocessor internal flow chart.
Embodiment
A kind of feedback control system of controlling two parallel MZM modulator output intensities, as shown in Figure 1, it mainly is made up of fiber coupler, optical fiber receive module, A/D converter, digital comparator, memory, microprocessor and D/A converter.Wherein the input of fiber coupler connects the output of two parallel MZM modulators, the normal output light signal of the two parallel MZM modulators of main output output of this fiber coupler, the monitor optical signal of the two parallel MZM modulators of inferior output output.The input of optical fiber receive module links to each other with the inferior output of fiber coupler, and the output of optical fiber receive module links to each other with the input of A/D converter.2 outputs of A/D converter connect the input of digital comparator and memory respectively, the output of memory links to each other with another input of digital comparator, the output of digital comparator links to each other with the input of microprocessor, and the output of microprocessor connects the power end of two parallel MZM modulators through D/A converter.
Fiber coupler is by obtaining the monitor optical signal along separate routes from the light signal of two parallel MZM modulator outputs.In the present embodiment, selected fiber coupler is the fiber coupler of 1:99.
Optical fiber receive module is used for pair modulated light signal that parallel MZM modulators are exported is converted into voltage signal.In the present embodiment, optical fiber receive module is connected to form by photodetector and trans-impedance amplifier, wherein the input of photodetector is connected with fiber coupler, and the output of photodetector links to each other with the input of trans-impedance amplifier, and the output of trans-impedance amplifier is connected with A/D converter.
A/D converter, the analog voltage signal that optical fiber receive module is exported is converted into digital signal.
Memory under microprocessor instruction control, is preserved the digital signal of A/D converter output as nominal value.In addition, in order to inquire about the state of running, described memory also links to each other with another road output of microprocessor.
Comparator compares the real time digital signal of A/D converter output and the nominal value that is kept in the register, and sends comparative result to microprocessor.
Microprocessor, the storage of control storage data and zero clearing, and according to the comparative result that comparator is exported, adopt pid algorithm to produce the suitable digital regulating signal of a combination.In the present embodiment, described microprocessor is single-chip microcomputer or ARM chip.
D/A converter is finished the digital-to-analogue conversion of the digital regulating signal of microprocessor output, and generation can be satisfied the voltage of the full control range of direct current biasing of two parallel MZM modulators.
The feedback of the two parallel MZM modulator output intensities of the control that above-mentioned feedback control system realizes comprises the steps:
1. at the fiber coupler of the 1:99 of output termination of two parallel MZM modulators, obtain the monitor optical signal along separate routes by this fiber coupler and send into fiber coupler.
2. optical fiber receive module converts the monitor optical signal of importing to voltage signal and sends into A/D converter.Optical fiber receive module converts the monitor optical signal to photo-signal by photodetector earlier, and then converts photo-signal to voltage signal by trans-impedance amplifier.
3. A/D converter is converted to digital signal with the voltage signal of input, and the digital signal of output is divided into two-way, one tunnel input digit comparator, another road input store.
4. microprocessor sends control signal at the beginning of operation, is memory device the state that allows storage, and the digital signal of A/D converter output is kept in the memory, as nominal value, and the storage end.
5. it is poor that the nominal value input digit comparator of storing in real time digital signal and the memory compares, and obtains the difference CZ of real time digital signal and nominal value.
6. with difference CZ input microprocessor, microprocessor is regulated computing by PID, obtains the suitable digital regulating signal of a combination.
7. this group digital regulating signal converts two required just bias voltage V of parallel MZM modulator to through D/A converter
1, V
2, V
3After send into the power end of two parallel MZM modulators so that the output intensity of two parallel MZM modulators is consistent substantially with initial value, guarantee that system can stable operation.
The detailed process following (referring to Fig. 2) that the feedback control system of the two parallel MZM modulator output intensities of this control is controlled two parallel MZM modulators:
A) RF signal and dc offset voltage have been loaded simultaneously on the sub-modulator MZM-1 of two parallel MZM modulators, with respect to other the easier generation temperature of sub-modulator build-up effects that loads dc offset voltage, cause the easier generation minor variations of refractive index of the lithium niobate material of this sub-modulator.Therefore, microprocessor is at first regulated the dc offset voltage of MZM-1.
B) microprocessor is at first regulated the dc offset voltage of MZM-1, adopts pid algorithm to carry out, and the specific algorithm flow chart is seen Fig. 3, makes output intensity near initial value by the dc offset voltage of regulating MZM-1, satisfies system requirements as far as possible;
C) as regulating the dc offset voltage of MZM-1, the output intensity of two parallel MZM modulators still exists than large deviation with initial value, can not satisfy system requirements, then uses pid algorithm that the dc offset voltage of MZM-2 is regulated, and error amount is further reduced;
D) adopt pid algorithm to regulate to MZM-3, error amount is reduced, reach requirement.
Description by above implementation method, the staff of this area can recognize clearly that the present invention can realize by hardware and software platform, based on such understanding, technical scheme of the present invention can embody with the form of software and hardware product the contribution of background technology.The components and parts of this hardware product can be bought on the market and obtain, by building and can carry out in conjunction with software product the described method of some part of each embodiment of the present invention or embodiment.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.
Claims (6)
1. the feedback control system of the two parallel MZM modulator output intensities of control is characterized in that: mainly be made up of fiber coupler, optical fiber receive module, A/D converter, digital comparator, memory, microprocessor and D/A converter; Wherein the input of fiber coupler connects the output of two parallel MZM modulators, the normal output light signal of the two parallel MZM modulators of main output output of this fiber coupler, the monitor optical signal of the two parallel MZM modulators of inferior output output; The input of optical fiber receive module links to each other with the inferior output of fiber coupler, and the output of optical fiber receive module links to each other with the input of A/D converter; 2 outputs of A/D converter connect the input of digital comparator and memory respectively, the output of memory links to each other with another input of digital comparator, the output of digital comparator links to each other with the input of microprocessor, and the output of microprocessor connects the power end of two parallel MZM modulators through D/A converter.
2. the feedback control system of the two parallel MZM modulator output intensities of control according to claim 1, it is characterized in that: another road output of described microprocessor also links to each other with memory.
3. according to the feedback control system of claim 1 with the two parallel MZM modulator output intensities of 2 described controls, it is characterized in that: described optical fiber receive module is connected to form by photodetector and trans-impedance amplifier, wherein the input of photodetector is connected with fiber coupler, the output of photodetector links to each other with the input of trans-impedance amplifier, and the output of trans-impedance amplifier is connected with A/D converter.
4. according to the feedback control system of claim 1 with the two parallel MZM modulator output intensities of 2 described controls, it is characterized in that: described microprocessor is single-chip microcomputer or ARM chip.
5. based on the feedback of the two parallel MZM modulator output intensities of control of the feedback control system of the two parallel MZM modulator output intensities of the described control of claim 1, it is characterized in that, comprise the steps:
1. at the fiber coupler of the 1:99 of output termination of two parallel MZM modulators, obtain the monitor optical signal along separate routes by this fiber coupler and send into fiber coupler;
2. optical fiber receive module converts the monitor optical signal of importing to voltage signal and sends into A/D converter;
3. A/D converter is converted to digital signal with the voltage signal of input, and the digital signal of output is divided into two-way, one tunnel input digit comparator, another road input store;
4. microprocessor sends control signal at the beginning of operation, is memory device the state that allows storage, and the digital signal of A/D converter output is kept in the memory, as nominal value, and the storage end;
5. it is poor that the nominal value input digit comparator of storing in real time digital signal and the memory compares, and obtains the difference CZ of real time digital signal and nominal value;
6. with difference CZ input microprocessor, microprocessor is regulated computing by PID, obtains the suitable digital regulating signal of a combination;
7. this group digital regulating signal converts two required just bias voltage V of parallel MZM modulator to through D/A converter
1, V
2, V
3After send into the power end of two parallel MZM modulators so that the output intensity of two parallel MZM modulators is consistent with initial value.
6. the feedback of the two parallel MZM modulator output intensities of control according to claim 5, it is characterized in that, step 2. in, optical fiber receive module converts the monitor optical signal to photo-signal by photodetector earlier, and then converts photo-signal to voltage signal by trans-impedance amplifier.
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Cited By (6)
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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 |
| CN109856890A (en) * | 2019-03-25 | 2019-06-07 | 上海交通大学 | Optical analog to digital conversion system in parallel demultiplexing module automatic bias control method |
| 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 |
| CN114070413A (en) * | 2020-07-31 | 2022-02-18 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| US11848707B2 (en) | 2020-02-25 | 2023-12-19 | Hisense Broadband Multimedia Technologies Co., Ltd. | Optical module |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN109856890A (en) * | 2019-03-25 | 2019-06-07 | 上海交通大学 | Optical analog to digital conversion system in parallel demultiplexing module automatic bias control method |
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| US11848707B2 (en) | 2020-02-25 | 2023-12-19 | Hisense Broadband Multimedia Technologies Co., Ltd. | 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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