CN202126519U - Light attenuation system - Google Patents
Light attenuation system Download PDFInfo
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- CN202126519U CN202126519U CN201120202886XU CN201120202886U CN202126519U CN 202126519 U CN202126519 U CN 202126519U CN 201120202886X U CN201120202886X U CN 201120202886XU CN 201120202886 U CN201120202886 U CN 201120202886U CN 202126519 U CN202126519 U CN 202126519U
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Abstract
The utility model discloses a light attenuation system which relates to the technical field of light equipment. The light attenuation system comprises an electric variable optical attenuator, an input light beam splitter, an output light beam splitter, a control device, an optical attenuator driving circuit and at least one light intensity detector, wherein an input terminal of the input light beam splitter is connected with an input light path, two output terminals of the input light beam splitter are respectively connected with an input port of the electric variable optical attenuator and the input terminal of the light intensity detector, the input terminal of the output light beam splitter is connected with an output port of the electric variable optical attenuator, the two output terminals of the output light beam splitter are respectively connected with the input terminal of the light intensity detector and an output light path, the input terminal of the control device is connected with an output terminal of the light intensity detector, the output terminal of the control device is connected with is connected with the input terminal of the optical attenuator driving circuit, and the output terminal of the optical attenuator driving circuit is connected with a control port of the electric variable optical attenuator. The light attenuation system has the advantages of high control accuracy and response speed, and is especially applicable to a transmitting terminal in a quantum key distribution system.
Description
Technical field
The utility model relates to the light device technical field, relates in particular to a kind of control method and optical attenuation system of electric adjustable optical attenuator, is used for the quantum key distribution system transmitting terminal.
Background technology
Optical attenuator is a kind of optical passive component that is widely used in the optical-fiber network; Be used for luminous power is carried out a certain amount of decay; Can be divided into fixed optical attenuator and adjustable optical attenuator; The former is mainly used in and regulates optical link power, and the latter is mainly used in the too high light communication circuit of luminous power and produces fixed attenuation.Wherein adjustable optical attenuator can be divided into mechanical type adjustable optical attenuator and electric adjustable optical attenuator (Elactrical Variabal Optical Attenuator according to the difference of regulative mode; And electric adjustable optical attenuator can be divided into voltage type optical attenuator and Current Control formula optical attenuator according to the difference of employing drive signal EVOA).
Quantum cryptology is on the quantum-mechanical theory basis, to develop and next a kind of new data encryption technology.Be different from traditional cryptographic technique based on mathematical theory, the quantum cryptography ciphered data can or not be inserted into the data that another section has malice by any acquisition, so quantum cryptography is the safest in theory data encryption technology.The quantum cryptology system has comprised that quantum key distribution, quantum storage and relaying, quanta identity authentication, intrusion detection, quantum coding, quantum cryptography are shared, the research directions such as combination of quantum security protocol, quantum cryptography analysis, quantum information theory and quantum cryptography and classical password.Wherein quantum-key distribution is the core of quantum cryptography system, along with going deep into of research, gradually contents such as quantum relaying, intrusion detection has also been included in the research contents of quantum-key distribution.Therefore the quantum cryptography of researcher with the direct acute pyogenic infection of finger tip narrow sense of quantum key distribution also arranged.Because the pad value of EVOA its decay repeatability of each making alive after demarcating well is relatively poor in the transmitting terminal in quantum key distribution system, and the variation of pad value can cause the minimizing of safe key amount, is the major hidden danger of total system communication security.
For addressing this problem, in the existing quantum key distribution system in the transmitting terminal EVOA can increase automatic control section usually, thereby the pad value of EVOA can be remained in the acceptable amplitude of variation.Generally all be to use stepper drive in the disclosed at present EVOA decay automatic control system scheme, this kind mode attenuation accuracy is not high, and system response time is slow excessively, is approximately about 1s, and the dynamic range of system attenuation is narrow in addition.
The utility model content
Thereby being to overcome in the existing quantum key distribution system in the transmitting terminal pad value of EVOA, the utility model technical matters to be solved all can change a key difficult problem that causes the communication security coefficient decreased to some extent demarcating its decay of each making alive of good back; A kind of control method and optical attenuation system of electric adjustable optical attenuator are provided, can improve the system accuracy and the response time of the interior optical attenuation of transmitting terminal in the quantum key distribution system.
The control method of the electric adjustable optical attenuator of the utility model comprises:
Step 1, through importing light respectively with the light input end mouth of electric adjustable optical attenuator, beam splitter that optical output port is connected respectively and output light is told certain proportion;
The input light that step 2, detection are told, output light intensity;
Step 3, the input light of telling that obtains according to detection, output light intensity, and the ratio told of input light, output light is calculated the actual attenuation value of electric adjustable optical attenuator;
The actual attenuation value that step 4, basis calculate and the difference of predefined standard pad value are controlled electric adjustable optical attenuator.
Further, said to electric adjustable optical attenuator control be difference with actual attenuation value and predefined standard pad value as input, control through the PID controller.
The optical attenuation system of the utility model; Comprise electric adjustable optical attenuator; Said electric adjustable optical attenuator comprises light input end mouth, optical output port and control port, and said optical attenuation system also comprises input beam splitter, output beam splitter, control device, optical attenuator driving circuit and at least one light intensity test device; The input end of said input beam splitter is connected with input light path, and two output terminals are connected with the input port of electric adjustable optical attenuator, the input end of light intensity test device respectively; The input end of said output beam splitter is connected with the output port of electric adjustable optical attenuator, and two output terminals are connected with input end, the output light path of light intensity test device respectively; The input end of said control device is connected with the output terminal of light intensity test device, and output terminal is connected with the input end of optical attenuator driving circuit; The output terminal of optical attenuator is connected with the control port of electric adjustable optical attenuator and drives electric adjustable optical attenuator according to the control signal that control device transmits to be regulated the damping capacity of light.
Preferably, said electric adjustable optical attenuator is the voltage type optical attenuator.
Preferably, said control device is the PID controller.
The utility model has solved in the quantum key distribution system in the transmitting terminal pad value of EVOA and has demarcated key difficult problem that its decay of each making alive of good back all can change to some extent; And compare according to input light and output photometry the actual attenuation value and the standard pad value that obtain; Through the PID controller electric adjustable optical attenuator is carried out real-time regulated, improved control accuracy, the response speed of total system.
Description of drawings
Fig. 1 is the structural representation of the optical attenuation system of the utility model;
Fig. 2 is the principle of work synoptic diagram of the optical attenuation system of the utility model.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to the utility model:
The optical attenuation system of the utility model shown in accompanying drawing 1, comprises electric adjustable optical attenuator, input beam splitter, output beam splitter, control device, optical attenuator driving circuit and at least one light intensity test device; The input end of said input beam splitter is connected with input light path, and two output terminals are connected with the input port of electric adjustable optical attenuator, the input end of light intensity test device respectively; The input end of said output beam splitter is connected with the output port of electric adjustable optical attenuator, and two output terminals are connected with input end, the output light path of light intensity test device respectively; The input end of said control device is connected with the output terminal of light intensity test device, and output terminal is connected with the input end of optical attenuator driving circuit; The output terminal of optical attenuator driving circuit is connected with the control port of electric adjustable optical attenuator and drives electric adjustable optical attenuator according to the control signal that control device transmits to be regulated the damping capacity of light.
In this embodiment, said control device adopts the PID controller, and optical attenuator adopts the voltage type optical attenuator.Very high owing to the total system frequency in quantum key distribution system; If so the adjustment time of attenuator longly will reduce the key generation very significantly; And the response time of voltage type optical attenuator is in the microsecond magnitude, so be well suited for quantum key distribution system.The utility model is to use pid algorithm that the voltage type optical attenuator is controlled, and pid algorithm is very ripe algorithm, and good reliability and algorithm are simple, so the time that MCU handles also can accelerate.In order to simplify pid algorithm, only use proportional algorithm in the system in addition, and the scale-up factor of each pad value has all been done different settings, so both can satisfy shortcut calculation and reduce the MCU processing time, also can improve the response speed of system.Because existing light intensity test device has the multichannel input and output usually; Therefore; In this embodiment, adopt a light intensity test device with multichannel input, output, the light that input end beam splitter and output terminal beam splitter are told can use this light intensity test device simultaneously; Certainly, also can respectively use a light intensity test device.This device converts light signal into electric signal through opto-electronic conversion earlier, gets into amplification filtering entering high speed analog-digital converter again and converts digital signal into, handles the back through MCU and uses the high-speed figure analog converter that the evanescent voltage of EVOA is controlled.
The principle of work of the optical attenuation system of the utility model is as shown in Figure 2, and the concrete course of work is following:
A, add the input beam splitter at the EVOA light input end, its beam split ratio is 10:90, and the light source with 10% is introduced light intensity test device, is used for monitoring input light source; Other 90% light source is then introduced the input end of EVOA; Add the output beam splitter at the EVOA light output end, its beam split ratio is 1:99, and 99% light source is introduced light intensity test device, is used to monitor output light source, and other 1% light source is then as the output light of EVOA; The beam split ratio here is merely an example, can confirm the beam split ratio according to actual conditions in concrete the application;
B, light intensity test device detect the light source of input beam splitter and the introducing of output beam splitter respectively, and it detects principle and is to use photodiode to convert light signal into current signal, changes potential circuit through electric current again and converts voltage signal into;
C, the voltage signal that prime is exported carry out twice amplification, and output voltage signal is through frequency overlapped-resistable filter afterwards, and the 12bit high speed analog-digital converter through MCU converts digital signal at last, and this digital signal has characterized the intensity of input light source.Wherein, Amplification multiple is controlled through MCU for the second time; Its principle is to carry out the switching between the multirange through analog switch; And when switch is whether numerical value according to digital analog converter conversion this moment is excessive or too small, if excessive or too small lower range or the high range of will switching to is a rational value until the numerical value of conversion;
D, because input light only causes supervisory system in proportion with output; And itself also has error the ratio of beam splitter; And the insertion loss that also has optical fiber; So will restore real input and output light intensity to the numerical value correction of A/D converter conversion, and its ratio is the value of system's actual attenuation just;
E, system's actual attenuation value and standard pad value are done difference, and difference is used pid algorithm, will pass through the digital analog converter that the value after the calculating uses serial bus interface to pass in the driving circuit and convert simulating signal into; Wherein the standard pad value can be to preestablish, and also can import and revise through communication interface;
Amplifier in F, the driving circuit amplifies simulating signal, and adds the output that one-level drives EVOA.So promptly realized the damping capacity of EVOA is monitored in real time and regulated.
The optical attenuation system of the utility model is the light source of 1uw to 10uw for the input light intensity, and the scope of its decay is at 25dB to 50dB, and the dynamic range that promptly decays is 25dB, and precision is controlled at 1%, and the response time is in 100ms.Can satisfy the request for utilization of quantum key distribution system fully.
Claims (4)
1. optical attenuation system; Comprise electric adjustable optical attenuator; Said electric adjustable optical attenuator comprises light input end mouth, optical output port and control port; It is characterized in that said optical attenuation system also comprises input beam splitter, output beam splitter, control device, optical attenuator driving circuit and at least one light intensity test device; The input end of said input beam splitter is connected with input light path, and two output terminals are connected with the input port of electric adjustable optical attenuator, the input end of light intensity test device respectively; The input end of said output beam splitter is connected with the output port of electric adjustable optical attenuator, and two output terminals are connected with input end, the output light path of light intensity test device respectively; The input end of said control device is connected with the output terminal of light intensity test device, and output terminal is connected with the input end of optical attenuator driving circuit; The output terminal of optical attenuator driving circuit is connected with the control port of electric adjustable optical attenuator and drives electric adjustable optical attenuator according to the control signal that control device transmits to be regulated the damping capacity of light.
2. optical attenuation system according to claim 1 is characterized in that said electric adjustable optical attenuator is the voltage type optical attenuator.
3. optical attenuation system according to claim 1 is characterized in that said control device is the PID controller.
4. optical attenuation system according to claim 1 is characterized in that, said input beam splitter divide to light intensity test device be 10:90 with dividing ratio to the light of the input port of electric adjustable optical attenuator; Said output beam splitter divide to light intensity test device be 99:1 with dividing ratio to the light of output light path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120202886XU CN202126519U (en) | 2011-06-16 | 2011-06-16 | Light attenuation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120202886XU CN202126519U (en) | 2011-06-16 | 2011-06-16 | Light attenuation system |
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| CN202126519U true CN202126519U (en) | 2012-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120202886XU Expired - Fee Related CN202126519U (en) | 2011-06-16 | 2011-06-16 | Light attenuation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094113A (en) * | 2016-08-18 | 2016-11-09 | 桂林创研科技有限公司 | Adjustable optical attenuator |
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2011
- 2011-06-16 CN CN201120202886XU patent/CN202126519U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094113A (en) * | 2016-08-18 | 2016-11-09 | 桂林创研科技有限公司 | Adjustable optical attenuator |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20140616 |
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| EXPY | Termination of patent right or utility model |