A RECEIVER FOR RECEIVING INFORMATION TRANSMITTED USING VERY WEAK LIGHT PULSES, A SYSTEM FOR TRANSMITTING INFORMATION COMPRISING SUCH A RECEIVER AND A METHOD FOR TRANSMITTING INFORMATION USING VERY WEAK LIGHT PULSES

摘要

The object of the invention is a receiver for receiving information using very weak light pulses, which comprises an input, optical elements and a detector, characterised in that it comprises at least one module, which comprises at least one polarisation splitting element, an element with a different optical path length for each of the split polarisations, and a plate rotating the polarisation. The object of the invention is also a system for transmitting information using very weak light pulses, comprising a transmitter and a receiver, characterised in that the receiver comprises at least one module which comprises at least one polarisation splitting element, an element with a different optical path length for each of the split polarisations and a half-wave plate rotating the polarisation (HWP). The object of the invention is also a method for transmitting information using very weak light pulses, characterised in that in the receiver a light pulse having at least two different polarisations splits into at least two optical signals with different polarisations; subsequently, the signal with one of the split polarisations is delayed with respect to the optical signal with other polarisation, upon which the signals are merged and undergo amplification due to interference, and subsequently the signals are recorded in a detector.