Patent ID: 6501891
Filing Date: 2002-12-31
Classification: G02B

Abstract:
An optical transmission module, comprising:at least one of a light emitting element and a light receiving element; an optical fiber; and an optical wave-guide provided one of between said light emitting element and said optical fiber and between said light receiving element and said optical fiber; wherein said optical wave-guide has a z-axis in a direction of light propagation, an x-axis in a vertical direction on a cross-sectional plane perpendicular to said z-axis, and a y-axis in horizontal direction thereon, said optical wave-guide including: a core portion formed so that light is transmitted in the direction of said z axis, around at a center of an origin of said x axis and y axis; and a crud layer surrounds said core portion and is lower in refractive index than a refractive index of said core portion, said core portion including a plural number of segments, and at least one of said segments has a recess portion around at a position where y=0.