High-encoding-rate point-to-point QKD system, transmitting terminal, receiving terminal and QKD method
A code rate, point-to-point technology, used in transmission systems, digital transmission systems, wavelength division multiplexing systems, etc., can solve the problem of limited code rate improvement and limited code rate. Working frequency, working efficiency limitation and other issues, to achieve the effect of improving code rate, reducing cost and energy consumption, and reducing insertion loss
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[0045] Example 1 One-way communication
[0046] Such as figure 1 As shown, a high rate point-to-point QKD system of the present invention includes a transmitting end (Alice) and a receiving end (Bob) that are matched with each other, and the transmitting end and the receiving end communicate through a multi-core optical fiber 104.
[0047] The transmitting end includes a light source module (specifically using a laser board), multiple beam splitters (such as beam splitter 101), an encoder (signal light encoding module), and multiple wavelength division multiplexers (such as wavelength division multiplexers). 102). Optical fiber sector outputter 103 as a multi-core optical fiber interface.
[0048] In addition, a main control logic module is also provided, namely figure 1 Alice’s electronic equipment is used to control the luminescence of the laser panel and the synchronized light source and generate the modulation signal for the signal light encoding module.
[0049] The logic control...
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[0078] Example 2 Two-way communication
[0079] Figure 4 It is a point-to-point QKD system with high rate of bidirectional communication. It is an improved scheme of embodiment 1, using optical fiber circulators (such as optical fiber circulator 401 and optical fiber circulator 407) to add components symmetrical to the original multiplexing system at the Alice transmitting end and Bob receiving end of embodiment 1, respectively: signal light The decoding module 2, the signal light detection module 2 and the laser board 2, the signal light encoding module 2, make the quantum communication in both directions share the wavelength division multiplexer (such as the wavelength division multiplexer 402 and the wavelength division multiplexer) 406), fiber sector output device (fiber sector output device 403 and fiber sector output device 405) and multi-core optical fiber 404 composed of an intensive optical path, and at the same time add a Bob end to Alice end of the synchronous optical...
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