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US 8,131,125 B2Granted
Bend-insensitive single-mode optical fiber
AssigneeDraka Comteq B.V.
InventorsLouis-Anne de Montmorillon, Simon Richard, Denis Molin, David Boivin, Marianne Bigot-Astruc, Pierre Sillard
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Abstract
The present invention embraces a single-mode optical fiber that, at a wavelength of 1550 nanometers, has bending losses of 0.15 dB/turn or less for a radius of curvature of 5 millimeters.
Claims30
A single-mode optical fiber, comprising:
- a central core surrounded by an outer optical cladding;
- wherein, at a wavelength of 1310 nanometers, the optical fiber has a nominal mode field diameter (MFD) between 8.6 microns and 9.5 microns;
- wherein, at a wavelength of 1550 nanometers, the optical fiber has bending losses of 0.15 dB/turn or less for a radius of curvature of 5 millimeters;
- and
- wherein the optical fiber has a standard cable cut-off wavelength of 1260 nanometers or less.
2 more elements
A single-mode optical fiber, comprising:
- a central core surrounded by an outer optical cladding;
- wherein, at a wavelength of 1310 nanometers, the optical fiber has a mode field diameter (MFD) between 8.2 microns and 9.9 microns;
- wherein, at a wavelength of 1550 nanometers, the optical fiber has bending losses of 0.15 dB/turn or less for a radius of curvature of 5 millimeters;
- and
- wherein, at a wavelength of 1260 nanometers, the LP11-mode attenuation is 19.3 dB after propagation through 45 meters or less of the optical fiber while the optical fiber is straight.
2 more elements
A single-mode optical fiber, comprising:
- a central core surrounded by an outer optical cladding, the central core having a radius r1 and a positive refractive index difference Δn1 with the outer optical cladding;
- an intermediate cladding positioned between the central core and the outer optical cladding, the intermediate cladding having a radius r2 and a refractive index difference Δn2 with the outer optical cladding, wherein the refractive index difference Δn2 is less than the refractive index difference Δn1;
- and
- a depressed trench positioned between the intermediate cladding and the outer optical cladding, the depressed trench having a radius r3 and a negative refractive index difference Δn3 with the outer optical cladding;
- wherein:
- the surface integral of the central core (V01), defined as
- V
- 01
- =
- ∫
- 0
- r
-
-
- 1
-
- Δ
-
-
- n
-
- (
- r
- )
- ·
- ⅆ
- r
- ≈
- r
- 1
- ×
- Δ
-
-
- n
- 1
- ,
- is between 19.0×10−3 micron and 23.0×10−3 micron;
- the surface integral of the depressed trench (V03), defined as
- V
- 03
- =
- ∫
- r
-
-
- 2
- r
-
-
- 3
-
- Δ
-
-
- n
-
- (
- r
- )
- ·
- ⅆ
- r
- ≈
- (
- r
- 3
- -
- r
- 2
- )
- ×
- Δ
-
-
- n
- 3
- ,
- is between −55.0×10−3 micron and −30.0×10−3 micron;
- and
- the volume integral of the depressed trench (V13), defined as
- V
- 13
- =
- 2
- ·
- ∫
- r
-
-
- 2
- r
-
-
- 3
-
- Δ
-
-
- n
-
- (
- r
- )
- ·
- r
- ·
- ⅆ
- r
- ≈
- (
- r
- 3
- 2
- -
- r
- 2
- 2
- )
- ×
- Δ
-
-
- n
- 3
- ,
- is between −1200×10−3 μm2 and −750×10−3 μm2.
124 more elements
Dependencies are inferred from the claim text.