A control device and control method for the bias voltage of an electro-optic intensity modulator
An electro-optical intensity modulation and control device technology, which is applied in the direction of control/regulation systems, instruments, and adjustment of electrical variables, can solve the problems of non-monotonicity of the bias voltage of electro-optic modulators in quantum secret communication and difficulties in direct control, and achieve simple structure , low price, easy to achieve effect
Inactive Publication Date: 2014-10-29
SOUTH CHINA NORMAL UNIVERSITY
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[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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[0029] The bias voltage control device proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. like figure 1 As shown, it is a schematic structural diagram of the control device for the bias voltage of the electro-optic intensity modulator according to an embodiment of the present invention, and 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 , a microprocessor 4 and a drive circuit module 5; a part of the signal output end of the optical beam splitter is connected with the signal input end of the photoelectric conversion circuit module 1, and the signal output end of the drive circuit module 5 is controlled with the bias voltage of the electro-optic intensity modulator end connection.
[0030] A part of the modulated light output by the optical beam splitter i...
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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 security communication, in particular to a control device and a control method for the bias voltage of a Mach-Zehender type electro-optical intensity modulator. Background technique [0002] With the development of computer technology and the popularization of network applications, the security of information is becoming more and more important, and the requirements for confidentiality algorithms are getting higher and higher. Some classic confidential communications that were widely used or are now commonly used are constantly being deciphered. , and with the development of quantum computers, almost all classical secure communication will no longer be safe, and there is an urgent need for new secure communication methods, and quantum secure communication has emerged as the times require. The security of the quantum security communication system is based on the basic principles of physics, using a...
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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