Patent ID: 6462877
Filing Date: 2002-10-08
Classification: G02B,H04B,H04J

Abstract:
A method of non-symmetric photonic filtering comprising:providing an input signal having first and second frequencies wherein the first frequency is modulated with information; providing a first reference signal at the first frequency; directing the input signal and the first reference signal to a first beam splitter characterized by a first proportioning parameter and configured to control the proportions of energy directed to first and second paths having respective first and second transit times of substantially equal duration; splitting energy corresponding to the second frequency into first and second portions; directing the first and second portions to the first and second paths, respectively; producing interference between the first reference signal and the input signal at the first frequency at the first beam splitter to produce a constructive interference signal and a destructive interference signal corresponding thereto; directing the constructive interference signal to the first path and the destructive interference signal to the second path; directing energy from the first and second paths to a second beam splitter, configured to produce interference there between and having a second proportioning parameter non-complementary to the first proportioning parameter; and directing energy from the second beam splitter to third and fourth paths, the third path receiving energy resulting from constructive interference at the second frequency at the second beam splitter, with the fourth path receiving energy from the input signal, embodying the information therein at the first frequency, and energy from the first reference signal.