OPTICAL WAVEGUIDE AND ELECTRONIC DEVICE

摘要

An optical waveguide is provided with: a first cladding layer; a core layer which is provided on the first cladding layer and which has a cladding section, a first core section, a cladding section, a second core section, and a cladding section provided in the in-layer direction in said order; and a second cladding layer which is provided on the core layer. The refractive-index distribution (W) in the in-layer direction of a portion covering the first core section and the cladding section among the core layer continuously changes, and has regions lined up in the order of a first convex section, a first concave section and a second convex section, with the refractive-index distribution (W) located in the first core section having the first convex section, and the refractive-index distribution (W) located in the cladding section having the second convex section which has a maximum refractive-index that is less than the first convex section; and the refractive-index distribution (T) in the between-layer direction of a portion covering the first cladding layer and the first core section changes in a discontinuous manner in the boundary between the first cladding layer and the first core section .