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Time delay compensation method for self-adaptive optical fiber length in quantum key distribution system

A technology of quantum key distribution and fiber length, applied in time division multiplexing systems, transmission systems, photon quantum communication and other directions, can solve the problems of different transmission speeds of light sources, delay drift and other problems, and achieve the effect of simple system structure

Inactive Publication Date: 2017-05-31
北京信息科学技术研究院 +1
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Problems solved by technology

Solve the problem of delay drift caused by different transmission speeds of light sources with different wavelengths in the same fiber

Method used

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  • Time delay compensation method for self-adaptive optical fiber length in quantum key distribution system

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Embodiment Construction

[0034] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with specific examples. The embodiments described below are exemplary only for explaining the present invention and should not be construed as limiting the present invention. If no specific technique or condition is indicated in the examples, it shall be carried out according to the technique or condition described in the literature in this field or according to the product specification.

[0035] According to one aspect of the present invention, the present invention provides a device and method for delay compensation of adaptive optical fiber length in a quantum key distribution system, the device includes a sending end, a receiving end and a unit between them root fiber. figure 2 is the structural diagram of the transmitting end of the single-fiber system, such as figure 2...

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Abstract

The invention provides a time delay compensation device and a time delay compensation method for the self-adaptive optical fiber length in a quantum key distribution system. The device comprises a sending terminal, a receiving terminal and a single optical fiber positioned between the sending terminal and the receiving terminal, wherein the sending terminal comprises a processor, a timer, a classic light laser, a synchronous light laser, a quantum light laser, an electrically-controlled attenuator, a wavelength division multiplexer and a classical light detector; the method comprises the steps of carrying out distance measurement on optical fiber channels, calculating time delay and compensating. According to the device and the method, in the quantum key distribution system, the relative time delay of synchronous light and quantum light is measured and calculated according to the different lengths of the optical fiber channels, and time delay compensation is then added into the sending terminal; the problem of time delay drift caused by the different transmission speeds of light sources with different wavelengths in the same optical fiber is solved by using an active compensation method, so that error codes are reduced, and the stability of system operation is even guaranteed.

Description

technical field [0001] The invention belongs to the technical field of quantum key distribution, and specifically relates to a delay compensation method for adaptive fiber length in a quantum key distribution system, which is used to measure and calculate the relative delay between synchronous light and quantum light, and transmit end to add delay compensation. Background technique [0002] In the quantum key distribution system, two different wavelengths of light are used, one with stronger light intensity is called synchronous light, which is used to open the door for the single photon detector at the receiving end; Quantum light, used to transmit quantum information. When the sending end sends these two kinds of light, it will adjust the relative delay of the two kinds of light according to the actual operation of the system, so that the two lights are separated from each other for a period of time, so as to avoid the interference of the synchronous light on the quantum ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04B10/70H04B10/077
CPCH04B10/077H04B10/70H04J3/0682
Inventor 王宇刘梦捷胡滨姜英杰黄敦峰
Owner 北京信息科学技术研究院
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