Patent ID: 8961839
Filing Date: 2015-02-24
Classification: G02B

Abstract:
1. A production method of an optical waveguide, comprising: preparing a laminated body that comprises a first clad layer having a thickness of 30 μm to 150 μm and at least a core layer laminated on the first clad layer; forming a light propagating optical waveguide core by cutting through the core layer by use of a dicing saw from a side where the core layer is laminated while intruding an edge of a blade portion of the dicing saw into the first clad layer so as to partially cut the first clad layer, an incising amount of the blade portion of the dicing saw into the first clad layer being 10 μm or more, a cutting residue amount of the first clad layer being 10 μm or more, and a deformation portion of a cross-sectional shape of a cut groove due to wear of the edge of the blade portion of the dicing saw being formed in the first clad layer; and embedding at least a cut portion of the laminated body with a material of a second clad layer, wherein the edge of the blade portion of the dicing saw is non-flat, wherein a cross-sectional shape of the edge of the blade portion of the dicing saw is non-flat when viewed along a main cutting direction of the blade portion, wherein the blade portion is configured such that the resulting cut portion has a cross-sectional shape when viewed along the main cutting direction of the blade portion, wherein the cross-sectional shape of the cut portion comprises: wherein the upper side portion defines a first approximate line, wherein the bottommost portion defines a second approximate line, wherein the lower side portion starts deviating from the first approximate line starting at a deviating point, and wherein a length R, measured in a depth direction of the cut portion, between said deviating point and said second approximate line is 10 μm or more.