Optical waveguide components and optical waveguide sheets

Abstract

This invention provides an optical waveguide element that connects two optical waveguide portions with different absolute values ​​of refractive indices and different refractive index differences between the core and cladding portions with high coupling efficiency. The optical waveguide element of this invention is characterized by having a coupling portion 120 obtained by stacking a first optical waveguide portion 100 and a second optical waveguide portion 110. The first optical waveguide portion 100 has a first cladding portion 101 and a first cladding portion 102, and the second optical waveguide portion 110 has a second core portion 111 and a second cladding portion 112. The refractive indices of each core portion 101, 111 and each cladding portion 102, 112 are different at a wavelength of 1300 nm, and the refractive index difference between the first cladding portion 102 and the second cladding portion 112 at a wavelength of 1300 nm is 0.05 or less.

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