Encoding device, optical reflector and quantum key distribution device and system based thereon

Abstract

The invention discloses an encoding device, comprising: a polarization beam splitter rotator PSR, which is used to receive input signal light, divide the input signal light into two parts with the same polarization mode, and send them to a polarization rotation structure and a modulator respectively; the polarization rotation structure , which is connected with the PSR and the modulator, and has the function that the polarization direction of the optical signal entering from one end is rotated 180 degrees, and the polarization direction of the optical signal entering from the other end remains unchanged; the modulator is used to modulate the light input to the modulator; The PSR is also used to receive the signal light sent by the polarization rotation structure and the modulator, combine the two signal lights to obtain the output signal light, and send the output signal light. The embodiment of the present invention can support a high-speed modulator to meet the requirements of high-speed communication.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to an encoding device and quantum key distribution QKD equipment and system based on the encoding device. Background technique [0002] Quantum communication is a communication technology developed on the basis of classical information theory and quantum mechanics. The current practical quantum communication technology mainly refers to Quantum Key Distribution (QKD). Among them, the security of the key depends on the basic principles of quantum mechanics, such as the theory of measurement collapse, non-cloning and uncertainty principles. Therefore, the key assigned to the communication parties using the QKD system has been proved to be safe in theory. QKD has broad application prospects in military, national defense, information security and other fields. [0003] Existing QKD systems such as figure 1 As shown, the quantum light source is located at the sending end (Alice end)...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a coding device, which can replace the FM and modulator in the existing QKD system, and solve the problem that the existing QKD system can only use low-speed modulators and cannot meet the requirements of high-speed communication question

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