Patent ID: 7266304
Filing Date: 2007-09-04
Classification: H04B,H04L,Y04S

Abstract:
1. An optical transmission system for transmitting a binary code, comprising: a sender; a receiver; and a transmission line disposed between said sender and said receiver, the sender comprising: and the receiver comprising: wherein the phase-shifter means of the sender impose a randomly chosen phase-shift to one of 0 and Π/2 for a first bit value or equal to one of Π and 3Π/2 for a second bit value of the binary code; wherein the phase-shifter means of the receiver impose a randomly chosen phase-shift equal to one of 0 and Π/2; and wherein the detector means of the receiver include means for detecting the presence of the photon in the first lateral mode and means for detecting the presence of the photon in the second lateral mode, the first bit value of the binary code being detected if the presence of the photon is detected in the first lateral mode and the second bit value being detected if the presence of the photon is detected in the second lateral mode.