OPTICAL WAVEGUIDE, OPTICAL MODULATION DEVICE AND MANUFACTURING METHOD OF OPTICAL WAVEGUIDE

• Main Authors: ISHIKAWA YOSHIZUMI, KUGIMOTO ARINORI, TAKANO SHINGO
• Format: Patent
• Language: English; Japanese
• Published: 19.04.2018
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To provide an optical waveguide capable of enhancing light propagation efficiency by reducing propagation loss of light due to defect formed in a concave groove.SOLUTION: The optical waveguide includes: a clad layer formed with a concave groove in a principal plane; and a core layer which is laminated over the clad layer at the principal plane side for embedding the concave groove. Defining that, in a cross section shape of the concave groove perpendicular to extending direction of the concave groove, positions at 1/2 of depth of the concave groove as A and B, and a position that a straight line extended an a depth direction from the center of a line segment connecting A and B as C, the concave groove has a curved part which has a curvature radius of 1/5 or more of the depth of the concave groove in at least a part of portion from A to C and from B to C.SELECTED DRAWING: Figure 3 【課題】凹溝に形成された欠陥に起因する光の伝播損失を低減し、光の伝播効率を高めた光導波路の提供を目的とする。【解決手段】主面に凹溝が形成されたクラッド層と、前記クラッド層の主面側に積層され前記凹溝を埋め込むコア層と、を備え、前記凹溝は、前記凹溝の延伸方向と直交する前記凹溝の断面形状において、前記凹溝の深さの１／２の位置をＡ、Ｂとし、ＡとＢを結んだ線分の中央から深さ方向へ直線を伸ばした位置をＣとした場合、ＡからＣ、及びＢからＣの各部分の少なくとも一部に前記凹溝の深さの１／５以上の曲率半径を持つ曲線部を有する、光導波路。【選択図】図３