Optical signal generating apparatus, method thereof, transmitting apparatus, transmitting method, receiving apparatus, receiving method, transmitting and receiving apparatus, and transmitting and receiving method

摘要

Four optical interferometers are arranged in parallel. Optical path length differences of the optical interferometers are set to L, rxL, rxrxL, and rxrxrxL, respectively, where L is a unit optical path length difference (constant). A coefficient r by which the unit optical path length difference L is multiplied is any non-integer real number for example an irrational number. An irrational number is for example a surd ({square root}2, {square root}3, etc.), ratio of circumference D, or base e of a natural logarithm. When such optical path length differences are set in such a manner, a chaotic dynamical system, an addition theorem, and a chaotic map are not satisfied with respect to the intensities of light which is output from the optical interferometers. In other words, a thoroughly unpredictable sequence can be generated. The sequence is spectrum spread as spread codes.