Control device of bias voltage of electro-optical intensity modulator and control method thereof

An electro-optical intensity modulation and bias voltage technology, which is applied in control/regulating systems, instruments, adjusting electrical variables, etc., can solve the problems of non-monotonicity of electro-optical modulator bias voltage and difficulty in direct control of quantum security communication, and achieves a structural Simple, improve the signal-to-noise ratio, and work stably

Inactive Publication Date: 2012-10-10
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

[0005] In order to overcome the non-monotonicity and direct control difficulties of the bias voltage of the electro-optic modulator in the quantum secret communication in the prior art, the present invention provides a control device and a control method for the bias voltage of the electro-optic intensity modulator to solve the problem of lithium niobate DC point drift problem of M-Z type electro-optical intensity modulator, so as to stabilize the extinction ratio of the output optical pulse

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  • Control device of bias voltage of electro-optical intensity modulator and control method thereof
  • Control device of bias voltage of electro-optical intensity modulator and control method thereof
  • Control device of bias voltage of electro-optical intensity modulator and control method thereof

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Embodiment Construction

[0029] The bias voltage control device proposed by the present invention will be further described in detail below with reference to the drawings and specific implementation methods. Such as figure 1 Shown is a schematic structural diagram of a device for controlling bias voltage of an electro-optical intensity modulator according to an embodiment of the present invention. The device includes a photoelectric conversion circuit module 1, a lock-in amplifier circuit module 2, and an A / D conversion circuit module 3 connected in sequence. , The microprocessor 4 and the drive circuit module 5; a part of the signal output end of the optical beam splitter is connected to the signal input end of the photoelectric conversion circuit module 1, and the signal output end of the drive circuit module 5 is controlled by the bias voltage of the electro-optical intensity modulator 端连接。 End connection.

[0030] Part of the modulated light output by the optical beam splitter is used for quantum comm...

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Abstract

The invention discloses a control device of the bias voltage of an electro-optical intensity modulator for quantum private communication and a control method thereof. The control device is a high-accuracy closed-loop control device. The output of the electro-optical intensity modulator is converted into electric signals by an optical detector; and low-frequency signals for direct-current point drifting are extracted by utilizing a lock-in amplifier circuit module. The invention has the advantages that the drifting condition is monitored by a microprocessor, so that the circuit module is driven to change the bias voltage of the electro-optical intensity modulator, and the electro-optical intensity modulator is positioned at a proper working point. The control device has the advantages that the automatic control of the bias voltage of the electro-optical intensity modulator is realized, so that the electro-optical intensity modulator can work continuously by stable extinction ratio, and the working stability of the system for the quantum private communication is improved.

Description

Technical field [0001] The invention relates to the technical field of quantum secure communication, in particular to a Mach-Zehender type electro-optical intensity modulator bias voltage control device and a control method thereof. Background technique [0002] With the development of computer technology and the popularization of network applications, the security of information has become more and more important, and the requirements for confidential algorithms have become higher and higher. Some classic confidential communications that have been widely used or are now in widespread use continue to be deciphered. , And with the development of quantum computers, almost all classical secure communications will no longer be secure. There is an urgent need for new secure communications methods to appear, and quantum secure communications have emerged at the historic moment. The security of the quantum secure communication system is based on the basic principles of physics, using a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/46
Inventor 郭莉魏正军王进王金东张智明廖常俊刘颂豪
Owner SOUTH CHINA NORMAL UNIVERSITY
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