Resin optical waveguide
AssigneeAGC Inc.
InventorsSeiki Ohara, Kenta Kobayashi, Shotaro Takenobu
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Abstract
Provided is a resin optical waveguide containing a core, under cladding and over cladding, in which the resin optical waveguide has portions having a core width varying along a light propagation direction, the maximum core width is 4 to 10 μm, and the minimum core width of 1 μm or more and less than 4 μm, when the length of a portion S at which the core width is 1 μm or more and less than 4 μm is LS and the length of a portion at which the core width is 4 to 10 μm is LL, the proportion of LS to the total length is 0.1 to 40%, and the portion S contains neither a certain bubble defect nor a certain defect inside the core and in a vicinity of a core-cladding interface.
Claims12
A resin optical waveguide, comprising a core, and an under cladding and an over cladding, both of which have refractive indices lower than that of the core,
- wherein
- the resin optical waveguide has portions having a core width varying along a propagation direction of light,
- the resin optical waveguide has a maximum core width of 4 μm or more and 10 μm or less, and a minimum core width of 1 μm or more and less than 4 μm,
- a proportion of LS to a total of LS and LL as expressed by LS/(LS+LL) is from 0.1 to 40%, where LS is a length of a portion at which the core width is 1 μm or more and less than 4 μm and LL is a length of a portion at which the core width is 4 μm or more and 10 μm or less,
- the portion at which the core width is 1 μm or more and less than 4 μm comprises no bubble defect having a maximum diameter of 2 μm or more either inside the core or in a vicinity of a core-cladding interface at a distance of 15 μm or less from the center of the core,
- the resin optical waveguide has a core-exposed portion on one end side, at which the over cladding is not provided and the core and the under cladding around the core are exposed, and
- the core-exposed portion has a length of 100 μm or more in the propagation direction of light of the resin optical waveguide.
A resin optical waveguide, comprising a core, and an under cladding and an over cladding, both of which have refractive indices lower than that of the core,
- wherein
- the resin optical waveguide has portions having a core width varying along a propagation direction of light,
- the resin optical waveguide has a maximum core width of 4 μm or more and 10 μm or less, and a minimum core width of 1 μm or more and less than 4 μm,
- a proportion of LS to a total of LS and LL as expressed by LS/(LS+LL) is from 0.1 to 40%, where LS is a length of a portion at which the core width is 1 μm or more and less than 4 μm and LL is a length of a portion at which the core width is 4 μm or more and 10 μm or less,
- the portion at which the core width is 1 μm or more and less than 4 μm comprises no defect, which has an absolute value of a refractive index difference from a cladding material being 0.03 or more and a maximum diameter of 8 μm or more, either inside the core or in a vicinity of a core-cladding interface at a distance of 15 μm or less from the center of the core,
- the resin optical waveguide has a core-exposed portion on one end side, at which the over cladding is not provided and the core and the under cladding around the core are exposed, and
- the core-exposed portion has a length of 100 μm or more in the propagation direction of light of the resin optical waveguide.
Dependencies are inferred from the claim text.