Abstract: According to a manufacturing method of an optical waveguide substrate including a core (12) and clads (11) (13) and provided with an optical axis conversion mirror (14) in the core and an alignment recess for the optical axis conversion mirror with respect to a light receiving and emitting element, the recess is obtained by obtaining an outline of the core by synthesizing at least an image captured by focusing a microscope (20) to a highest position (14a) of the core in an optical axis conversion mirror portion and an image captured by focusing the microscope to a lowest position (14d), and by determining a position of the alignment recess in reference to a center of gravity of the outline, and according to an optical waveguide substrate obtained by this manufacturing method, it becomes possible to provide an optical waveguide substrate in which the optical axis conversion mirror in the optical waveguide substrate and the light receiving and emitting element are aligned with respect to each other at an extrem

Abstract: There are provided an optical waveguide including: a substrate 1; a lower clad layer 2; a core pattern 3 with a taper in thickness direction; and an upper clad layer 4, the lower clad layer, the core pattern, and the upper clad layer being sequentially laminated on the substrate 1, in which the lower clad layer 2 has a cutting part 5. There also provided with an optical waveguide including: a substrate 1; a lower clad layer 2; a core pattern 3 with a taper in thickness direction; and an upper clad layer 4, the lower clad layer, the core pattern, and the upper clad layer being sequentially laminated on the substrate 1, in which the lower clad layer 2 has a dummy part on the top. These optical waveguides can secure alignment tolerance when connected with an optical element.

Abstract: According to a manufacturing method of an optical waveguide substrate including a core (12) and clads (11) (13) and provided with an optical axis conversion mirror (14) in the core and an alignment recess for the optical axis conversion mirror with respect to a light receiving and emitting element, the recess is obtained by obtaining an outline of the core by synthesizing at least an image captured by focusing a microscope (20) to a highest position (14a) of the core in an optical axis conversion mirror portion and an image captured by focusing the microscope to a lowest position (14d), and by determining a position of the alignment recess in reference to a center of gravity of the outline, and according to an optical waveguide substrate obtained by this manufacturing method, it becomes possible to provide an optical waveguide substrate in which the optical axis conversion mirror in the optical waveguide substrate and the light receiving and emitting element are aligned with respect to each other at an extrem

Abstract: A method for producing a circuit board, contains, in this order, a step A of forming a circuit on a first substrate; a step B of laminating a first support on a surface of the first substrate having the circuit formed, through a first releasing layer; and a step C of forming a second substrate or circuit on a surface of the first substrate opposite to the surface having the circuit formed, and a method for producing an optoelectronic composite member, contains, in this order, a step of laminating an electric circuit board on a second support; a step of laminating a first support; a step of releasing the second support; and a step of forming an optical waveguide on a surface where the second support is released.