Optical module and fabrication method
AssigneeFujitsu Limited
InventorTakashi Shiraishi
Life of this patent
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Abstract
An optical module includes an optical waveguide that transmits and outputs signal light; a circuit board that transmits the signal light output from the optical waveguide, and includes a low refractive-index portion that neighbors and surrounds a transmissive portion and has a lower refractive index than the transmissive portion, which transmits the signal light; and a light-receiving element that includes, on a side toward the circuit board, a light-receiving portion that receives the signal light that has transmitted through the circuit board, where the signal light is reflected toward the light-receiving element at a boundary surface between the transmissive portion and the low refractive-index portion.
Claims11
An optical module comprising:
- an optical waveguide that transmits and outputs signal light;
- a circuit board that transmits the signal light output from the optical waveguide, and includes a low refractive-index portion that neighbors and surrounds a transmissive portion and has a lower refractive index than the transmissive portion, which transmits the signal light;
- and
- a light-receiving element that includes, on a side toward the circuit board, a light-receiving portion that receives the signal light that has transmitted through the circuit board, wherein
- the signal light is reflected toward the light-receiving element at a boundary surface between the transmissive portion and the low refractive-index portion,
- the circuit board includes a ground electrode at a surface on a side opposite of a circuit board surface toward the light-receiving element,
- the low refractive-index portion is provided up to a bottom of the circuit board, and
- the transmissive portion is fixed by the ground electrode provided on the circuit board.
A fabrication method of an optical module that includes an optical waveguide that transmits and outputs signal light, a circuit board that transmits the signal light output from the optical waveguide, and a light-receiving element that includes, on a side toward the circuit board, a light-receiving portion that receives the signal light that has been transmitted through the circuit board, the fabrication method comprising:
- making a circuit pattern on the circuit board;
- forming, on the circuit board, a low refractive-index portion that neighbors and surrounds a transmissive portion and has a lower refractive index than the transmissive portion, which transmits the signal light;
- and
- mounting the optical waveguide and the light-receiving element on the circuit board after the making and the forming, wherein
- the circuit board includes a ground electrode at a surface on a side opposite of a circuit board surface toward the light-receiving element, and
- the low refractive-index portion is formed at the forming by removing the circuit board around the transmissive portion such that the circuit board is penetrated and the transmissive portion is fixed onto the ground electrode.
Dependencies are inferred from the claim text.