Polarization encoding device and quantum key distribution system for quantum key distribution
A quantum key distribution and encoding device technology, which is applied in the field of polarization encoding devices and quantum key distribution systems, can solve the problems of inconsistent wavelengths of multiple lasers and high requirements for the drive circuit of the phase modulator, and achieve the resolution of inconsistent wavelengths, reduce complexity, The effect of reducing requirements
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Embodiment 1
[0032]The structure of the polarization encoding device is: the optical path selector is a beam splitter BS, and the 2X2 polarization encoding module includes a first circulator CIR1, a second circulator CIR2, a first polarization beam splitter PBS1, a fiber delay Line DL, phase modulator PM, second polarization beam splitter PBS2, first Faraday rotator FR1, first slave laser SL1, second Faraday rotator FR2, and second slave laser SL2, the first Faraday rotator FR1 , the first slave laser SL1, the second Faraday rotator FR2, and the second slave laser SL2 form a reflection assembly, and the polarization-maintaining fiber between the first circulator CIR1 and the first port of the first polarization beam splitter PBS1 conducts a 45° For fusion splicing, the polarization-maintaining fiber between the second circulator CIR2 and the second port of the 2X2 polarization encoding module is fused at 45°, the fiber delay line DL, the phase modulator PM, the first polarization beam split...
Embodiment 2
[0059] The structure of the polarization encoding device is: the optical path selector is a beam splitter BS, and the 2X2 polarization encoding module includes a first circulator CIR1, a second circulator CIR2, a first polarization beam splitter PBS1, a fiber delay Line DL, phase modulator PM, second polarization beam splitter PBS2, first optical switch OSW1, first Faraday mirror FM1, second optical switch OSW2, second Faraday mirror FM2, the first optical switch OSW1, The first Faraday reflector FM1, the second optical switch OSW2, and the second Faraday reflector FM2 constitute a reflective assembly, and the polarization-maintaining fiber between the first circulator CIR1 and the first port of the first polarization beam splitter PBS1 conducts a 45° For fusion splicing, the polarization-maintaining fiber between the second circulator CIR2 and the second port of the 2X2 polarization encoding module is fused at 45°, the fiber delay line DL, the phase modulator PM, the first pol...
Embodiment 3
[0065] The structure of the polarization encoding device is: the optical path selector is a third optical switch OSW3, and the 2X2 polarization encoding module includes a first circulator CIR1, a second circulator CIR2, a first polarization beam splitter PBS1, an optical fiber extension Time line DL, phase modulator PM, second polarization beam splitter PBS2, third Faraday mirror FM3, fourth Faraday mirror FM4, the third Faraday mirror FM3, fourth Faraday mirror FM4 constitute a reflection assembly, The third optical switch OSW3 is a 1X2 optical switch, the polarization-maintaining optical fiber between the first circulator CIR1 and the first port of the first polarization beam splitter PBS1 is fused at 45°, and the second circulator CIR2 and the 2X2 The polarization-maintaining fiber between the second ports of the polarization encoding module is fused at 45°, and the fiber delay line DL, phase modulator PM, first polarization beam splitter PBS1 and second polarization beam sp...
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