FIELD: optical communication technique.
SUBSTANCE: device comprises a laser, a fiber optic insulator, a phase modulator, a tunable fiber optic attenuator, a passive fiber optic attenuator, a fiber optic insulator, a temperature controller, a quantum channel for transmitting single photons, a fiber optic insulator, a fiber optical beam splitter, a phase modulator, a fiber optical photodetector, fiber spectral filter, photon detector.
EFFECT: technical result consists in providing resistance to optical probing of modulators.
1 cl, 1 dwg
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