Patent ID: 8559820
Filing Date: 2013-10-15
Classification: H04J

Abstract:
1. An optical communication system including an optical transmitter and an optical receiver; wherein the optical transmitter includes an optical correlator, which has been allocated a code word of a complex orthogonal code of code length N represented by any row of an N×N square matrix in which an element of an m the optical receiver includes an optical correlator, which has been allocated a code word of a complex orthogonal code of code length N represented by any row of an N×N square matrix in which an element of an m said optical correlator of said optical transmitter or said optical receiver includes: a sampled Bragg grating having a plurality of Bragg gratings disposed serially at regular intervals inside an optical waveguide, reflectivities of these Bragg gratings being adjusted in conformity with amplitude of said allocated code word, and phase differences of light waves reflected by adjacent Bragg gratings being adjusted so as to be equal between all Bragg gratings in conformity with phase differences between adjacent elements of said allocated code word; and an optical circulator for introducing an input optical signal to said sampled Bragg grating and extracting reflected light waves that are output from said sampled Bragg grating.