An optical signal transmitter, an optical signal receiving apparatus, an optical signal transmission and reception system and an optical communication method

摘要

PROBLEM TO BE SOLVED: To transmit data by stably generating a couple of optical signals which cannot be easily assumed by a person wiretapping the data.;SOLUTION: The light of wavelength λ1 is generated with a first light source 8, and the light of different wavelength λ2 is generated with a second light source 9. The one light is modulated with a digital signal originated from noise in a first light modulator 10, and the other light is modulated with an inversion pattern signal inverted in the pattern of the digital signal in a second light modulator 11. A couple of the modulated lights are combined in a wavelength combining filter 15, and the combined light is modulated with the data signal in a third light modulator 16. The modulated light signal is branched into the light signal of wavelength λ1 and the light signal of wavelength λ2 with a wavelength branching filter 18, and these two light signals are outputted to different paths through adjustment of delay and optical amplification.;COPYRIGHT: (C)2005,JPO&NCIPI