FIELD: optical communication equipment.
SUBSTANCE: photonic quantum communication systems. At the same time, the device introduces virtually no losses in radiation power at the telecommunications wavelength of 1550 nm. The quantum communication device contains a sender unit, including a coherent radiation source (1), a fiber optical insulator (2), a phase modulator (3), a tunable fiber optical attenuator (4), a passive fiber optical attenuator (5), a fiber optical insulator (6), a single-mode optical fiber wound on a coil with a radius of 12 mm (7), and a receiver unit containing a single-mode optical fiber wound on a coil with a radius of 12 mm (9), a phase modulator (10), a fiber spectral filter (11).
EFFECT: immunity of the quantum communication device to optical probing of modulators with long-wave radiation due to the fact that the device contains a passive element - fiber winding, which attenuates radiation in the wavelength range 1800-2100 nm by at least 50 dB.
1 cl, 1 dwg
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