Optical waveguide, optical waveguide module and method for forming optical waveguide
First Claim
1. An optical waveguide comprising:
- a silica glass optical fiber having a core and a clad providing a core/clad equivalent refractive index difference within a range from not less than 0.8% to not more than 3.5% and having an outer diameter of 50 micrometers or more than 50 micrometers; and
a bend provided in a specified portion of the silica glass optical fiber, said bend having a specified bend radius and being in an initial distortion free state and having said core/clad equivalent reflective index difference,the specified bend radius is smaller than a radius of a fracture limit of the silica glass optical fiber at a room temperature.
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Abstract
An optical waveguide comprising a core and a clad characterized in that a desired part is heated and transited to machining strain release state, the part transited to the machining strain release state is curved with a specified bending radius and transited to machining strain state. That part of the optical waveguide is heated to a temperature within a range between the bending point and softening point and transited to machining strain state. The optical waveguide is an optical fiber having the outer diameter not shorter than 50 μm. The optical waveguide has the outer diameter not shorter than ten times of the mode field diameter of the optical waveguide. The optical waveguide has a bending radius of 5.0 mm or less and difference equivalent of refractive index &Dgr;1 between the core and clad falls within a range of 0.8-3.5%.
41 Citations
19 Claims
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1. An optical waveguide comprising:
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a silica glass optical fiber having a core and a clad providing a core/clad equivalent refractive index difference within a range from not less than 0.8% to not more than 3.5% and having an outer diameter of 50 micrometers or more than 50 micrometers; and a bend provided in a specified portion of the silica glass optical fiber, said bend having a specified bend radius and being in an initial distortion free state and having said core/clad equivalent reflective index difference, the specified bend radius is smaller than a radius of a fracture limit of the silica glass optical fiber at a room temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14, 15, 16, 18, 19)
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11. A method of forming an optical waveguide comprising:
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providing a silica glass optical fiber having a core and a clad; heating a specified portion of said silica glass optical fiber to a high temperature; bending said portion of the silica glass fiber at the high temperature so as to make a bend radius of the portion become smaller than a radius of a fracture limit of the silica glass optical fiber at a room temperature; and providing said portion of the silica glass optical fiber to have a core/clad equivalent refractive index difference of silica glass optical fiber within a range from not less than 0.8% to not more than 3.5%. - View Dependent Claims (12)
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17. An optical waveguide comprising:
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a core and a clad providing a core/clad equivalent refractive index difference of 2.5%, and having an outer diameter of 80 μ
m,a bend provided in a specified portion of the optical waveguide, said bend having specified bend radius of 1 mm, and an angle of bend of 90°
, the bend being in an initial distortion free state.
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Specification