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US 2017/0322371 A1Published application
Fiber structural body and light source device
AssigneeCanon Kabushiki Kaisha
InventorsHideo Iwase, Yukihiro Inoue
Life of this patent
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Abstract
A fiber structural body includes a first fiber, and a second fiber spliced to the first fiber such that light having propagated through the first fiber propagates through the second fiber. At least one of the fibers is a photonic crystal fiber. The second fiber is coated with a first coating layer and a second coating layer in order from a splice surface, and the first coating layer has a refractive index n1 larger than that of a clad layer of the second fiber. In the fiber structural body, L, r, n1, and NA satisfy a particular relationship.
Claims10
A fiber structural body comprising:
- a first fiber;
- and
- a second fiber spliced to the first fiber such that light that has propagated through the first fiber propagates through the second fiber,
- wherein at least one of the first fiber and the second fiber is a photonic crystal fiber,
- wherein the second fiber is coated with a first coating layer and a second coating layer in order from a splice surface between the first optical fiber and the second optical fiber,
- wherein the first coating layer has a refractive index n1 that is larger than a refractive index of a clad layer of the second fiber, and
- wherein a relational expression of L>(r×n1)/NA is satisfied, where NA is a numerical aperture of the first fiber, r is a radius of the second coating layer with a center of the second fiber as an origin point, and L is a distance between the splice surface and an end of the first coating layer.
4 more elements
Dependencies are inferred from the claim text.