Optical fibers comprising triangular trench profile
AssigneeOFS Fitel, LLC
InventorsDavid D Braganza, Alan A Klein, David W Peckham
Life of this patent
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Abstract
An optical fiber that complies with ITU-T G.657.A2 recommendations. The optical fiber comprises an inner cladding that is adjacent to the core, thereby extending from a core radius (rcore) to an inner cladding radius (rinner_clad). The inner cladding refractive index decreases approximately linearly as a function of radius (r), thereby decreasing approximately linearly from a first inner cladding relative refractive index (Δinner_clad_1) to a second inner cladding relative refractive index (Δinner_clad_2). The ratio of rinner_clad to rcore is between approximately 3.2 and approximately 4.2 (˜3.2≤rinner_clad/rcore≤˜4.2).
Claims20
An optical fiber comprising:
- a reference relative refractive index (Δ0);
- an axial center (r0);
- a core extending radially from r0 to a core radius (rcore), the core comprising a core relative refractive index (Δcore);
- an inner cladding extending radially from rcore to an inner cladding radius (rinner_clad), the inner cladding comprising a r-dependent inner cladding relative refractive index (Δinner_clad(r)), Δinner_clad(r) decreasing approximately linearly as a function of r, Δinner_clad(r) decreasing from a first inner cladding relative refractive index (Δinner_clad_1) to a second inner cladding relative refractive index (Δinner_clad_2);
- an outer cladding extending radially from rinner_clad to an outer cladding radius (router_clad), the outer cladding comprising an outer cladding relative refractive index (Δouter_clad);
- wherein:
- router_clad is not greater than ˜62.5 μm (router_clad≤˜62.5±1.0 μm);
- ˜4.0 μm≤rcore≤˜4.5 μm;
- ˜3.2≤rinner_clad/rcore≤˜4.2;
- Δ0 is approximately zero percent (Δ0≅0±0.03%);
- ˜0.33±0.03%≤Δcore≤˜0.40±0.03%;
- Δinner_clad_1≤Δ0;
- Δinner_clad_2<Δinner_clad_1;
- −0.275±0.03%≤Δinner_clad_2≤−0.235±0.03%;
- and
- Δinner_clad(r)≅(Δinner_clad_1)+((Δinner_clad_2)*(r−rcore)/(rinner_clad−rcore));
- a nominal mode-field diameter (MFD) between approximately 8.6 μm and approximately 9.2 μm at a center wavelength (λ) of ˜1310 nanometers (nm), the nominal MFD having a tolerance of approximately ±0.4 μm;
- a cable cutoff wavelength (λcutoff) that is less than ˜1260 nm;
- and
- macro-bending losses that comply with ITU-T G.657.A2 recommendations.
An optical fiber comprising:
- a reference relative refractive index (Δ0);
- an axial center (r0);
- a core extending radially from r0 to a core radius (rcore), the core comprising a core relative refractive index (Δcore);
- an inner cladding extending radially from rcore to an inner cladding radius (rinner_clad), the inner cladding comprising a r-dependent inner cladding relative refractive index (Δinner_clad(r)), Δinner_clad(r) decreasing approximately linearly as a function of r, Δinner_clad(r) decreasing from a first inner cladding relative refractive index (Δinner_clad_1) to a second inner cladding relative refractive index (Δinner_clad_2);
- an outer cladding extending radially from rinner_clad to an outer cladding radius (router_clad), the outer cladding comprising an outer cladding relative refractive index (Δouter_clad), Δouter_clad being approximately equal to Δ0 (Δouter_clad≅Δ0);
- and
- macro-bending losses that comply with ITU-T G.657.A2 recommendations.
Dependencies are inferred from the claim text.