Patent ID: 7260288
Filing Date: 2007-08-21
Classification: G02B

Abstract:
1. An optical wave guide element, comprising: a substrate which has electro-optic effect; an optical wave guide formed on the substrate; a reflective means formed on a side of the substrate where an incoming end of the optical wave guide is positioned; a transmission surface formed non-parallel to an input direction of the optical wave guide and apart from the optical wave guide; and an input optical fiber connected to the transmission surface, wherein the reflective means and the transmission surface are formed on the substrate so that a light wave exiting from the input optical fiber propagates within the substrate excluding the optical wave guide from the transmission surface toward the reflective means, and is reflected from the reflective means to enter the optical wave guide, an angle formed between an output direction of the input optical fiber and the input direction of the optical wave guide is set at approximately 90°, and the propagation distance of light waves that propagate inside the substrate excluding the optical wave guide, is 200 μm or less.