01-02-2018 дата публикации
Номер: US20180031762A1
Принадлежит:
Single mode optical fibers with a chlorine doped core and a cladding having a fluorine doped trench region are disclosed. The optical fiber includes a chlorine doped silica core having a core alpha α≧10, a core radius rand maximum refractive index delta Δ% and a Cl concentration≧0.9 wt %. The optical fiber also has a cladding surrounding the core, the cladding having an inner and an outer cladding. The inner cladding has first and second cladding regions. The optical fiber has mode field diameter at 1310 nm of larger than 9 microns, a cable cutoff wavelength of ≦1260 nm, a zero dispersion wavelength λ, where 1300 nm≦λ≦1324 nm, and bend loss at 1550 nm for a 20 mm mandrel of less than 0.5 dB/turn. 1. An optical fiber comprising:{'sub': 1', '1max, 'a) a chlorine doped silica core comprising a core alpha α≧10, a core radius rand maximum refractive index delta Δ% and Cl concentration≧0.9 wt %;'} [{'sub': 2a', '2', '2a', '2', '2', '2min', '2a', '2max', '2', '2min', '2max', '1max', '2max', '2min', '2', '1, 'a. an inner cladding region immediately surrounding the core and comprising first and second cladding regions with respective outer radii rand rwhere r0;'}, {'sub': max', '5', '2min', '5', '2max, 'b. an outer cladding region surrounding the first inner cladding region and comprising an outer radius rand refractive index delta Δ, such that Δ<Δ<Δ, and'}], 'b) a cladding surrounding the core, the cladding comprising{'sub': 0', '0, 'c) wherein the optical fiber comprises a mode field diameter MFD at 1310 nm of larger than 9 microns, a cable cutoff wavelength of ≦1260 nm, zero dispersion wavelength λ, where 1300 nm≦λ≦1324 nm and bend loss at 1550 nm for a 20 mm mandrel of less than 0.5 dB/turn.'}2. The optical fiber of claim 1 , where the first ...
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