CN102223181A - Control method of electrical variable optical attenuator and optical attenuation system - Google Patents
Control method of electrical variable optical attenuator and optical attenuation system Download PDFInfo
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- CN102223181A CN102223181A CN2011101617429A CN201110161742A CN102223181A CN 102223181 A CN102223181 A CN 102223181A CN 2011101617429 A CN2011101617429 A CN 2011101617429A CN 201110161742 A CN201110161742 A CN 201110161742A CN 102223181 A CN102223181 A CN 102223181A
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Abstract
The invention discloses a control method of an electrical variable optical attenuator and belongs to the technical field of optical equipment. The method comprises the following steps of: 1, respectively splitting an input light and an output light into a certain proportion by beam splitters which are connected with an optical input port and an optical output port of the electrical variable optical attenuator respectively; 2, detecting the strengths of the split input light and the split output light; 3, computing an actual attenuation value of the electrical variable optical attenuator according to the detected strengths of the split input light and the split output light and the split proportion of the input light and the output light; and 4, controlling the electrical variable optical attenuator according to a difference value between the computed actual attenuation value and a preset standard attenuation value. The invention also discloses an optical attenuation system. The invention has the advantages of high control accuracy and high response speed and is particularly applicable to a transmitting end in a quantum key distribution system.
Description
Technical field
The present invention relates to the light device technical field, relate in particular to a kind of control method and optical attenuation system of electric adjustable optical attenuator, be 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 to develop and next a kind of new data encryption technology on the quantum-mechanical theory basis.Be different from traditional cryptographic technique based on mathematical theory, the quantum cryptography ciphered data can not captured or be inserted into the data that another section has malice arbitrarily, 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 reproducibility 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 whole 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.
Summary of the invention
Thereby being to overcome in the existing quantum key distribution system in the transmitting terminal pad value of EVOA, technical problem to be solved by this invention all can change a key difficult problem that causes the communication security coefficient to descend 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 electric adjustable optical attenuator of the present invention comprises:
Step 1, by 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, described to electric adjustable optical attenuator control be difference with actual attenuation value and predefined standard pad value as input, control by the PID controller.
Optical attenuation of the present invention system, comprise electric adjustable optical attenuator, described electric adjustable optical attenuator comprises light input end mouth, optical output port and control port, and described optical attenuation system also comprises input beam splitter, output beam splitter, control device, optical attenuator drive circuit and at least one light intensity test device; The input of described input beam splitter is connected with input light path, and two outputs are connected with the input port of electric adjustable optical attenuator, the input of light intensity test device respectively; The input of described output beam splitter is connected with the output port of electric adjustable optical attenuator, and two outputs are connected with input, the output light path of light intensity test device respectively; The input of described control device is connected with the output of light intensity test device, and output is connected with the input of optical attenuator drive circuit; The output 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 attenuation of light.
Preferably, described electric adjustable optical attenuator is the voltage type optical attenuator.
Preferably, described control device is the PID controller.
The invention solves key difficult problem that the pad value of EVOA all can change to some extent in its decay of each making alive of the good back of demarcation the transmitting terminal in the quantum key distribution system, and compare according to input light and output photometry the actual attenuation value and the standard pad value that obtain, by the PID controller electric adjustable optical attenuator is carried out real-time regulated, improved control precision, the response speed of whole system.
Description of drawings
Fig. 1 is the structural representation of optical attenuation of the present invention system;
Fig. 2 is the operation principle schematic diagram of optical attenuation of the present invention system.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated:
Optical attenuation of the present invention system as shown in Figure 1, comprises electric adjustable optical attenuator, input beam splitter, output beam splitter, control device, optical attenuator drive circuit and at least one light intensity test device; The input of described input beam splitter is connected with input light path, and two outputs are connected with the input port of electric adjustable optical attenuator, the input of light intensity test device respectively; The input of described output beam splitter is connected with the output port of electric adjustable optical attenuator, and two outputs are connected with input, the output light path of light intensity test device respectively; The input of described control device is connected with the output of light intensity test device, and output is connected with the input of optical attenuator drive circuit; The output of optical attenuator drive 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 attenuation of light.
In this embodiment, described control device adopts the PID controller, and optical attenuator adopts the voltage type optical attenuator.Very high owing to the whole system frequency in quantum key distribution system, if so the adjustment time of attenuator long will very significant reduction key generation, and the response time of voltage type optical attenuator is in the microsecond magnitude, so be well suited for quantum key distribution system.The present invention 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 proportionality coefficient 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 beam splitter and output beam splitter are told can use this light intensity test device simultaneously, certainly, also can respectively use a light intensity test device.This device is converted to the signal of telecommunication by opto-electronic conversion with light signal earlier, enters amplification filtering again and enters the high speed analog-digital converter and be converted to digital signal, handles the back through MCU and uses the high-speed figure analog converter that the evanescent voltage of EVOA is controlled.
The operation principle of optical attenuation of the present invention system as shown in Figure 2, the concrete course of work is as follows:
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 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; Beam split ratio herein only is an example, can determine 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 that light signal is converted to current signal, changes potential circuit by electric current again and is converted to voltage signal;
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 by MCU is converted to digital signal at last, and this digital signal has characterized the intensity of input light source.Wherein, amplification multiple is controlled by MCU for the second time, its principle is to carry out switching between the multrirange by 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 smallly will switch to lower range or high range, be a rational value until the numerical value of conversion;
D, because input light only causes supervisory control 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 be converted to analog signal through the digital analog converter that the value after calculating uses serial bus interface to pass in the drive circuit; Wherein the standard pad value can be to preestablish, and also can import and revise by communication interface;
Amplifier in F, the drive circuit amplifies analog signal, and adds the output that one-level drives EVOA.So promptly realized the attenuation of EVOA is monitored in real time and regulated.
Optical attenuation of the present invention system 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 instructions for use of quantum key distribution system fully.
Claims (6)
1. the control method of an electric adjustable optical attenuator is characterized in that, this method comprises:
Step 1, by 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.
2. the control method of electric adjustable optical attenuator according to claim 1 is characterized in that, described to electric adjustable optical attenuator control be difference with actual attenuation value and predefined standard pad value as input, control by the PID controller.
3. optical attenuation system, comprise electric adjustable optical attenuator, described electric adjustable optical attenuator comprises light input end mouth, optical output port and control port, it is characterized in that described optical attenuation system also comprises input beam splitter, output beam splitter, control device, optical attenuator drive circuit and at least one light intensity test device; The input of described input beam splitter is connected with input light path, and two outputs are connected with the input port of electric adjustable optical attenuator, the input of light intensity test device respectively; The input of described output beam splitter is connected with the output port of electric adjustable optical attenuator, and two outputs are connected with input, the output light path of light intensity test device respectively; The input of described control device is connected with the output of light intensity test device, and output is connected with the input of optical attenuator drive circuit; The output of optical attenuator drive 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 attenuation of light.
4. as optical attenuation system as described in the claim 3, it is characterized in that described electric adjustable optical attenuator is the voltage type optical attenuator.
5. as optical attenuation system as described in the claim 3, it is characterized in that described control device is the PID controller.
6. as optical attenuation system as described in the claim 3, it is characterized in that, described input beam splitter divide to light intensity test device and divide to the ratio of the light of the input port of electric adjustable optical attenuator be 10:90; Described output beam splitter divide to light intensity test device and divide to the ratio of the light of output light path be 99:1.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798934A (en) * | 2012-08-10 | 2012-11-28 | 江苏奥雷光电有限公司 | Novel controllable optical attenuator and application method thereof |
| CN103427782A (en) * | 2012-05-15 | 2013-12-04 | 北京泛华恒兴科技有限公司 | Double-range signal attenuation device |
| CN103684757A (en) * | 2013-12-25 | 2014-03-26 | 中南大学 | Polarized light based secret key distribution system |
| CN103676708A (en) * | 2013-10-31 | 2014-03-26 | 江苏奥雷光电有限公司 | Controllable light attenuator and application method thereof |
| CN103824487A (en) * | 2014-02-27 | 2014-05-28 | 安徽问天量子科技股份有限公司 | Wiretap demonstration device and method based on quantum key communication |
| CN106100785A (en) * | 2016-07-28 | 2016-11-09 | 北京交通大学 | A kind of auto-manual adjustable optical attenuator |
| CN106357399A (en) * | 2016-10-26 | 2017-01-25 | 深圳市太赫兹科技创新研究院有限公司 | Quantum key distribution light source monitoring device and monitoring method thereof |
| CN107872316A (en) * | 2017-09-01 | 2018-04-03 | 南京邮电大学 | A kind of improved passive type based on decay LASER Light Source inveigles state QKD system |
| CN109547097A (en) * | 2017-09-22 | 2019-03-29 | 深圳市欧凌克光电科技有限公司 | A kind of optical signal launcher monitoring luminous intensity |
| CN111463647A (en) * | 2020-03-31 | 2020-07-28 | 武汉光迅科技股份有限公司 | Optical amplifier and adjusting method thereof |
| CN114448520A (en) * | 2020-11-06 | 2022-05-06 | 科大国盾量子技术股份有限公司 | Light intensity control method and device for stably outputting extremely weak light and quantum key distribution equipment |
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| US20030071201A1 (en) * | 2001-10-12 | 2003-04-17 | Tai-Cheng Yu | Variable optical attenuator |
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| US20030071201A1 (en) * | 2001-10-12 | 2003-04-17 | Tai-Cheng Yu | Variable optical attenuator |
| US7589889B2 (en) * | 2003-05-29 | 2009-09-15 | Ciena Corporation | Transient optical power suppressing apparatus, method, and network |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427782A (en) * | 2012-05-15 | 2013-12-04 | 北京泛华恒兴科技有限公司 | Double-range signal attenuation device |
| CN102798934A (en) * | 2012-08-10 | 2012-11-28 | 江苏奥雷光电有限公司 | Novel controllable optical attenuator and application method thereof |
| CN103676708B (en) * | 2013-10-31 | 2017-07-28 | 江苏奥雷光电有限公司 | A kind of controllable light attenuator and its application method |
| CN103676708A (en) * | 2013-10-31 | 2014-03-26 | 江苏奥雷光电有限公司 | Controllable light attenuator and application method thereof |
| CN103684757A (en) * | 2013-12-25 | 2014-03-26 | 中南大学 | Polarized light based secret key distribution system |
| CN103684757B (en) * | 2013-12-25 | 2017-01-11 | 中南大学 | Polarized light based secret key distribution system |
| CN103824487A (en) * | 2014-02-27 | 2014-05-28 | 安徽问天量子科技股份有限公司 | Wiretap demonstration device and method based on quantum key communication |
| CN103824487B (en) * | 2014-02-27 | 2016-01-13 | 安徽问天量子科技股份有限公司 | Based on eavesdropping apparatus for demonstrating and the method thereof of quantum key communication |
| CN106100785A (en) * | 2016-07-28 | 2016-11-09 | 北京交通大学 | A kind of auto-manual adjustable optical attenuator |
| CN106357399A (en) * | 2016-10-26 | 2017-01-25 | 深圳市太赫兹科技创新研究院有限公司 | Quantum key distribution light source monitoring device and monitoring method thereof |
| CN107872316A (en) * | 2017-09-01 | 2018-04-03 | 南京邮电大学 | A kind of improved passive type based on decay LASER Light Source inveigles state QKD system |
| CN109547097A (en) * | 2017-09-22 | 2019-03-29 | 深圳市欧凌克光电科技有限公司 | A kind of optical signal launcher monitoring luminous intensity |
| CN111463647A (en) * | 2020-03-31 | 2020-07-28 | 武汉光迅科技股份有限公司 | Optical amplifier and adjusting method thereof |
| CN111463647B (en) * | 2020-03-31 | 2021-10-29 | 武汉光迅科技股份有限公司 | Optical amplifier and adjusting method thereof |
| CN114448520A (en) * | 2020-11-06 | 2022-05-06 | 科大国盾量子技术股份有限公司 | Light intensity control method and device for stably outputting extremely weak light and quantum key distribution equipment |
| CN114448520B (en) * | 2020-11-06 | 2023-12-05 | 科大国盾量子技术股份有限公司 | Light intensity control method and device for stably outputting extremely weak light and QKD (quantum key distribution) equipment |
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Application publication date: 20111019 |