An optical amplitude modulation method suitable for a CVQKD system
A technology of amplitude modulation and amplitude modulation, which is applied in the field of optical amplitude modulation, can solve the problems of reduced modulation accuracy, affecting system security code rate, and increasing system complexity, and achieves high-speed optical amplitude modulation, high modulation accuracy, The effect of improving the bit rate
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[0015] The invention proposes an optical amplitude modulation method suitable for a continuous variable quantum cryptography system, based on the optical structure of an optical fiber Sagnac (Sagnac) ring, it can realize accurate amplitude modulation of quantum optical signals in a continuous variable quantum key distribution system The modulation function greatly improves the stability of the continuous variable quantum key distribution system. The realization of this scheme mainly includes: isolator (Isolator), 2x2 polarization maintaining fiber coupler BS, phase modulator PM, delay fiber DL, such as figure 1 shown. After the optical signal to be modulated enters the Isolator from Port1, it enters the BS through the BS-1 port, and after passing through the BS, it is divided into two paths by BS-3 and BS-4 through a certain ratio, and enters the PM from BS-3, and is output after being modulated by the PM. Then return to BS-4 through DL, this path is called clockwise transmis...
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