Single-mode optical fiber

摘要

A single-mode optical fiber includes a central core, an intermediate cladding, a buried trench, and optical cladding. The central core has an outer radius r1 and a refractive index difference Δn1 relative to the optical cladding. The intermediate cladding has an outer radius r2 and a refractive index difference Δn2 relative to the optical cladding. The buried trench has an outer radius r3 and a refractive index difference Δn3 relative to the optical cladding. The optical fiber typically has an effective area of about 150 μm2 or greater at a wavelength of 1550 nanometers and exhibits low bending losses.

主权项

1. A single-mode optical fiber, comprising:
a central core surrounded by an optical cladding, said central core having (i) an outer radius r1, (ii) a maximum refractive index difference Δn1 relative to said optical cladding of between about 2.6×10−3 and 3.5×10−3, and (iii) a volume V11 defined as follows:
V11=2π|∫0r1Δn(r)rdr|; an intermediate cladding positioned between said central core and said optical cladding, said intermediate cladding having an outer radius r2 and a refractive index difference Δn2 relative to said optical cladding; and a buried trench positioned between said intermediate cladding and said optical cladding, said buried trench having (i) an outer radius r3 of less than 24 microns, (ii) a refractive index difference Δn3 relative to said optical cladding of between about −15.0×10−3 and −4.5×10−3, and (iii) a volume V13 of between about 170%·μm2 to 830%·μm2 as defined as follows:V13=2⁢π⁢∫r2r3⁢(Δ⁢⁢n⁡(r)-(1r2-r1⁢)⁢∫r1r2⁢Δ⁢⁢n⁡(r)⁢ⅆr)⁢r⁢ⅆr; wherein said buried trench's volume V13 and said central core's volume V11, expressed in units of %·μm2, satisfy the following inequality:
V13>2.21×104·exp(−0.117·V11)+170; and wherein, at a wavelength of 1550 nanometers, the optical fiber has an effective area of about 150 μm2 or greater.