Single mode optical fiber

摘要

An optical transmission fiber comprises a central core having an index difference Δn1 with an outer optical cladding; a first inner cladding having an index difference Δn2 with the outer cladding; and a second buried inner cladding having an index difference Δn3 with the outer cladding of less than −3·10−3. The second buried inner cladding moreover contains Germanium in a weight concentration of between 0.5% and 7%.;The fiber shows reduced bending and microbending losses while exhibiting the optical performances of a standard single-mode fiber (SSMF).

主权项

1. An optical transmission fiber, comprising:
a central core and an outer optical cladding, the central core having a first refractive index difference (Δn1) with the outer cladding; a first inner cladding surrounding the central core, the first inner cladding having a second refractive index difference (Δn2) with the outer cladding; and a second, buried, inner cladding disposed between the first inner cladding and the outer cladding, the second inner cladding having a third refractive index difference (Δn3) with the outer cladding; wherein the optical transmission fiber has a cabled cut-off wavelength of 1260 nanometers or less; wherein the optical transmission fiber has a dispersion cancellation wavelength (λ0) between 1300 nanometers and 1324 nanometers; and wherein, at a wavelength of 1625 nanometers, the optical transmission fiber has bending losses of 2 dB or less for a winding of one turn around a bending radius of 5 millimeters.