Optical waveguide and method of forming the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMikihiro Shimada, Tsuguhiro Korenaga, Masanori Iida, Hiroyuki Asakura
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Abstract
A first substrate on which an optical-waveguide groove is formed and a second substrate. The second substrate is bonded to the plane of the first substrate on which the optical-waveguide groove is formed by a material having a refractive index higher than those of the first substrate and second substrate. The optical-waveguide groove is filled with the material, and the refractive index of the first substrate is different from the refractive index of the second substrate.
Claims14
An optical waveguide comprising:
- a first substrate having a plane on which an optical-waveguide groove is formed, said first substrate having a first refractive index;
- a second substrate having a second refractive index;
- and,
- a material layer formed by a material having a further refractive index higher than said first and said second refractive indices, said material layer disposed between said second substrate and said plane of said first substrate,
- said second substrate is bonded to said plane of said first substrate on which said optical-waveguide groove is formed by said material of said material layer,
- said optical-waveguide groove is filled with said material, and
- the first refractive index of said first substrate is different from the second refractive index of said second substrate, said first refractive index being different from said second refractive index to reduce propagation of wave-guiding light through said material layer in a portion of said material layer other than said optical-waveguide groove.
An optical-waveguide forming method of forming an optical waveguide having a first substrate and a second substrate bonded to said first substrate, in which an optical-waveguide groove is formed on the bonded plane of at least one of said first and second substrates, comprising:
- a step of making a first refractive index of said first substrate different from a second refractive index of said second substrate by applying light to at least one of said first and second substrates and thereby changing at least one of said first and said second refractive indices, respectively;
- and
- a step of bonding said first and said second substrates different from each other in said first and said second refractive indices together by a material having a further refractive index higher than said first and said second refractive indices of said first and second substrates, respectively,
- wherein said first refractive index being different from said second refractive index to reduce propagation of wave-guiding light through said material in a portion of said bonded plane other than said optical-waveguide groove.
An optical-waveguide forming method of forming an optical waveguide having a first substrate and a second substrate bonded to said first substrate, in which an optical-waveguide groove is formed on the bonded plane of at least one of said first and second substrates, comprising:
- a step of making a first refractive index of said first substrate different from a second refractive index of said second substrate by heating and cooling at least one of said first and second substrates and thereby changing at least one of said first and said second refractive indices, respectively;
- and
- a step of bonding said first and said second substrates different from each other in first and second refractive indices by a material having a further refractive index higher than said first and said second refractive indices of said first and second substrates, respectively,
- wherein said first refractive index being different from said second refractive index to reduce propagation of wave-guiding light through said material in a portion of said bonded plane other than said optical-waveguide groove.
Dependencies are inferred from the claim text.