System and method for driving, detecting and discriminating classical signals in single-fiber quantum key distribution system

A quantum key distribution and classical signal technology, which is applied in the field of classical signal drive and detection and discrimination systems, can solve the problems that the discriminator cannot respond normally, the light intensity at the receiving end becomes weak, and the discriminator has low sensitivity.

Active Publication Date: 2018-08-21
ANHUI QASKY QUANTUM SCI & TECH CO LTD
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Problems solved by technology

In the current QKD system, the amplification and modulation of classic signals are not perfect in terms of impedance matching and gain adjustment, the output eye diagram is seriously distorted, and the sensitivity of the discriminator used at the receiving end of classic signals is low. When the long-distance transmission attenuation increases , resulting in weak light intensity reaching the receiving end, and the discriminator cannot respond normally

Method used

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  • System and method for driving, detecting and discriminating classical signals in single-fiber quantum key distribution system
  • System and method for driving, detecting and discriminating classical signals in single-fiber quantum key distribution system

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Embodiment 1

[0026] see figure 1, the drive and detection and discrimination system of classical signals in this single-fiber quantum key distribution system, including the drive end and the discrimination end; the drive end includes a high-speed modulation amplifier, a digital-to-analog converter, a classical optical laser, and an active microwave integrated amplifier; The amplifier has a trigger enable adjustment control port, an amplitude modulation control port and a light intensity modulation control port; the trigger enable adjustment control port, the amplitude modulation control port and the light intensity modulation control port are respectively connected to the digital-to-analog converter; the digital-to-analog converter is used to trigger Enable the adjustment control port, the amplitude modulation control port and the light intensity modulation control port to control; the high-speed modulation amplifier has a classic signal input port for inputting classic signals; the high-sp...

Embodiment 2

[0029] see figure 1 and figure 2 , the method for driving, detecting and discriminating classical signals in the single-fiber quantum key distribution system includes the following steps:

[0030] The classic optical signal is input from the left port of the high-speed modulation amplifier, and the classic optical signal is amplified through the high-speed modulation amplifier; the high-speed modulation amplifier has two outputs, one is modulated and amplified and output to the first active microwave integrated amplifier. The second stage of the microwave integrated amplifier is amplified and then output to the classical optical laser; the other channel of the high-speed modulation amplifier outputs the bias current to adjust the light intensity of the classical optical laser;

[0031] Control the high-speed modulating amplifier trigger enable adjustment control port, amplitude modulation control port and light intensity modulation control port through digital-to-analog conv...

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Abstract

The invention discloses a single-fiber quantum key distribution system classic signal driving and detection and discrimination system. A high-speed modulation amplifier has a classic signal input end for inputting classic signals; an active microwave integrated amplifier is used for carrying out second-stage amplification on modulation amplified output signals and outputting the signals to a classic light laser; the input end of a classic optical detector is connected with the output end of the classic light laser; the output end of the classic optical detector is connected with the input end of a high-speed voltage comparator; the output signal of the classic light laser is input to the classic optical detector; detection output signals of the classic optical detector are input to the high-speed voltage comparator; and the high-speed voltage comparator is used for carrying out discrimination outputting on the detection output signals. The invention also discloses a single-fiber quantum key distribution system classic signal driving and detection and discrimination method. The method and system can guarantee that the classic signals are not distorted, provide a background current for the classic light laser, and ensure impedance matching of the output signals.

Description

technical field [0001] The invention relates to a system and method for driving, detecting and discriminating classical signals in a single-fiber quantum key distribution system. Background technique [0002] In the single-fiber quantum key distribution system (hereinafter referred to as QKD), the handshake signal, data error correction signal, quantum key security amplification signal and key agreement signal of both parties need to be amplified and modulated before being transmitted to the receiving end through optical fiber. Perform detection screening. In the current QKD system, the amplification and modulation of classic signals are not perfect in terms of impedance matching and gain adjustment, the output eye diagram is seriously distorted, and the sensitivity of the discriminator used at the receiving end of classic signals is low. When the long-distance transmission attenuation increases , resulting in weaker light intensity reaching the receiving end, and the discr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/70H04L9/08
CPCH04B10/70H04L9/0852
Inventor 黄敦峰刘梦婕苗春华吕利影刘云王春生
Owner ANHUI QASKY QUANTUM SCI & TECH CO LTD
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