Single-mode optical fiber

摘要

A single-mode optical fiber includes a central core surrounded by an outer optical cladding. The optical fiber includes an inner depressed cladding, a ring, and an outer depressed cladding positioned between the central core and the outer optical cladding. The central core typically has a refractive-index difference (Dn1) with the outer optical cladding of between about −0.5×10−3 and 0.5×10−3. The ring typically has an inner radius (rring1) of between about 21 microns and 35 microns and a refractive-index difference with the outer optical cladding (Dnring) of between about −0.5×10−3 and 0.5×10−3. The outer depressed cladding typically has a volume (Vout) of between about 15 μm2 and 30 μm2. The ratio of the volume of the central core over the width of the ring (Vcore/wring) is typically between about 0.12 micron and 0.2 micron.

主权项

1. A single-mode optical fiber, comprising:
a central core surrounded by an outer optical cladding, said central core having a radius (a) and a refractive-index difference (Dn1) with said outer optical cladding of between about −0.5×10−3 and 0.5×10−3; an inner depressed cladding positioned between said central core and said outer optical cladding, said inner depressed cladding having an outer radius (rring1) and a refractive-index difference (Dninner) with said outer optical cladding; a ring positioned between said inner depressed cladding and said outer optical cladding, said ring having an inner radius (rring1) of between about 21 microns and 35 microns, an outer radius (rring2), a width (wring), and a refractive-index difference (Dnring) with said outer optical cladding of between about −0.5×10−3 and 0.5×10−3; and an outer depressed cladding positioned between said ring and said outer optical cladding, said outer optical cladding having an outer radius (rout) and a refractive-index difference (Dnout) with said outer optical cladding; wherein said central core has a volume (Vcore), the ratio of said volume of said central core over said width of said ring (Vcore/wring) being between about 0.12 micron and 0.2 micron, the volume (Vcore) of said central core being defined as follows:Vcore=2⁢⁢π⁢∫0a⁢Dn⁡(r)⁢r⁢ⅆr wherein, Dn(r)=ncore(r)−ninner; ncore(r) is the refractive index of the central core at the radius r; and ninner is the average refractive index of the inner depressed cladding; wherein said outer depressed cladding has a volume of between about 15 μm2 and 30 μm2, said volume (Vout) of said outer depressed cladding being defined as follows:Vout=2⁢⁢π⁢∫rring⁢⁢2rout⁢Dn⁡(r)⁢r⁢ⅆr wherein, Dn(r)=nout(r)−ncl; nout(r) is the refractive index of the outer depressed cladding at the radius r; and ncl is the average refractive index of the outer optical cladding.