Spot size converter and method for making the same

摘要

In order to provide a spot size converter and a method for making the same which enable the optical connection with low loss and are able to reduce the excess loss for the position misalignment in mounting, a spot size converter according to an exemplary aspect of the present invention includes: a substrate on which an optical waveguide including a first core is laminated and which includes a notch; a core reducing part which is formed so that a cross-section area of the first core may gradually decrease toward an end part of the first core in the direction of light propagation; a second core which surrounds the core reducing part and is made of a material whose refractive index is smaller than that of the first core; a peripheral clad which surrounds the second core and is made of a material whose refractive index is smaller than that of the second core; and a lower clad which is formed in a lower part of the second core and includes the peripheral clad; wherein the lower clad is formed in the notch.

主权项

1. A spot size converter, comprising:
a substrate on which an optical waveguide including a first core is laminated and which comprises a notch; a core reducing part which is formed so that a cross-section area of the first core gradually decreases toward an end part of the first core in the direction of light propagation; a second core which surrounds the core reducing part and comprises a material whose refractive index is smaller than that of the first core; a peripheral clad which surrounds the second core and comprises a material whose refractive index is smaller than that of the second core; and wherein a portion of said peripheral clad is formed under a lower part of the second core, said portion defining a lower clad; wherein the lower clad is formed in the notch.