Patent ID: 6788832
Filing Date: 2004-09-07
Classification: G02F,H04B

Abstract:
An optical modulation apparatus comprising:an optical signal input section; an optical path that propagates the optical signals; a branching portion that divides said optical path into a plurality of optical paths; an optical modulator that phase modulates said optical signals in at least one of said plurality of optical paths; a wavelength selective optical filter that selectively reflects and selectively transmits said optical signals, said filter having a reflection center a distance L from a center of said optical modulator, wherein L satisfies (Nâˆ’Â¼)(c/f)/(2n)a structure for combining at said branching portion signals, into which an optical signal input from said input section is divided at said branching portion, and which are phase-modulated by said optical modulator, reflected by said optical filter back along said optical path and again phase-modulated by said optical modulator, and outputting a combined signal from said input section as an intensity-modulated optical signal.