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Optical fiber with a low-index core and a core grating
Optical fiber with a low-index core and a core grating
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机译:具有低折射率纤芯和纤芯光栅的光纤
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摘要
An optical fiber with a low-index core and a core grating has a solid and generally cylindrical annular cladding having a refractive index ncl, a central axis, an inner surface with a radius r wherein r≧2 μm, an outer surface with a radius R, and an annular thickness ΔR≧10 μm. The fiber core has the radius r and a refractive index nc, wherein nclnc. The grating is defined by grating elements that extend from the cladding inner surface into the core and that run generally parallel to the central axis. The grating elements define a period Λ, a width t, a spacing a and a height h, wherein 0.5Λ/λ1 and wherein 0.2≦t/a≦3.
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机译:具有低折射率纤芯和纤芯光栅的光纤具有实心且通常为圆柱形的环形包层,所述包层具有折射率n cl Sub>,中心轴,半径为r的内表面,其中r≥2 μm,具有半径R的外表面,并且环形厚度ΔR≥10μm。纤维芯具有半径r和折射率n c Sub>,其中n cl Sub n c Sub>。光栅由从包层内表面延伸到纤芯并大致平行于中心轴延伸的光栅元件限定。光栅元件限定周期Λ,宽度t,间距a和高度h,其中0.5 <Λ/λ<1并且其中0.2≤t/a≤3。
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