Optical waveguide board and optical module

An optical waveguide board comprising:

• a multi-mode optical waveguide formed on a substrate used to receive and transmit light wherein, when an angle of deviation of an optical path entering into said multi-mode optical waveguide is a spread half angle of light to be transmitted in a zero-order mode, a luminous flux fed from said optical path is formed by a light condensing unit so as to have a spread half angle being about two times or more larger than said angle of deviation of said optical path and said spread half angle of said luminous flux is set to be less than about 2.4 degrees.

An optical waveguide board comprising:

• a light condensing unit used to reflect a plurality of luminous fluxes incident from a plurality of light sources in a direction almost perpendicular to an incident direction and condense the a plurality of reflected luminous fluxes, said light condensing unit being so configured as to apply light from a direction being inclined to be directed toward a direction of an optical path to an optical waveguide in which a light incident surface being inclined relative to a direction of said optical path within a surface of a substrate in which said optical waveguide is made up of a plurality of optical waveguide components.

An optical module comprising:

• a light source made up of a surface light emitting device used to deflect a luminous flux in a specified direction, and
• an optical waveguide board wherein a multi-mode optical waveguide used to receive and transmit light fed from said light source is formed on a substrate and, when an angle of deviation of an optical path entering into said optical waveguide is a spread half angle of light to be transmitted in a zero-order mode, a luminous flux fed from said optical path is formed by a light condensing unit so as to have a spread half angle being about two times or more larger than said angle of deviation of said optical path and said spread half angle of said luminous flux is set to be less than about 2.4 degrees and wherein calibration is made by said light condensing unit so that an angular deviation in said optical path of a luminous flux entering into said optical waveguide relative to a direction in which light is transmitted in a zero-order mode in said optical waveguide is made smaller.

An optical module comprising:

• a light source and
• an optical waveguide board wherein a multi-mode optical waveguide used to receive and transmit light fed from said light source is formed on a substrate and, when an angle of deviation of an optical path entering into said optical waveguide is a spread half angle of light to be transmitted in a zero mode, a luminous flux fed from said optical path is formed by a light condensing unit so as to have a spread half angle being about two times or more larger than said angle of deviation of said optical path and said spread half angle of said luminous flux is set to be less than 2.4 degrees and wherein an optical path calibrating unit having a focusing distance being larger than that being used when an optical path is made smaller by said light condensing unit is placed between said light source and said light condensing unit and said optical path calibrating unit is so configured as to be movable in parallel to a surface of said optical waveguide board and wherein calibration is made by said light condensing unit so that an angular deviation in said optical path of a luminous flux entering into said optical waveguide relative to a direction in which light is transmitted in a zero-order mode in said optical waveguide is made smaller.

An optical module comprising:

• a plurality of light sources and
• an optical waveguide board on which a plurality of light sources is placed, wherein a light condensing unit to reflect a plurality of luminous fluxes incident from said plurality of light sources in a direction almost perpendicular to an incident direction and condense the a plurality of reflected luminous fluxes, said light condensing unit being so configured as to apply light from a direction being inclined to be directed toward an optical path to an optical waveguide in which a light incident surface being inclined relative to said optical path within a surface of a substrate in which said optical waveguide is made up of a plurality of optical waveguide components.