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US 12,700,707 B2Granted
Optical fiber and fiber laser device
AssigneeFujikura Ltd.
InventorRintaro Kitahara
Life of this patent
Estimating the term…
Abstract
An optical fiber includes a core and a cladding. An effective area Aeff of light of a fundamental mode, having a wavelength of 1070 nm and propagating through the core, is 500 μm2 or more. A numerical aperture NA of the core satisfies the following formula: NA ≧ ( 1.3 × 10 - 11 × a 4 / b 6 ) 1 / 6 where a (m) is a radius of the core and b (m) is a radius of the cladding. A V value, that is a waveguide parameter of the optical fiber, satisfies the following formula: V ≦ 1.3583 × b - 0.2555 .
Claims7
An optical fiber comprising:
- a core of radius a (m);
- and
- a cladding of radius of b (m), wherein
- a numerical aperture NA of the core satisfies the following formula:
- N
-
- A
- ≧
- (
- 1.3
- ×
- 1
-
- 0
- -
- 1
-
- 1
- ×
- a
- 4
- /
- b
- 6
- )
- 1
- /
- 6
- ,
- the optical fiber includes a bent portion that is bent with a bending radius that is 100 times or more of the radius b (m) such that:
- a V value, that is a waveguide parameter of the optical fiber, satisfies the following formula:
- V
- ≦
- 1
- .
- 3
-
- 5
-
- 8
-
- 3
- ×
- b
- -
- 0.2555
- ;
- and
- a fundamental LP01 mode of 1070 nm light propagates through the core with a loss of 0.001 dB/m and an effective area Aeff of 500 μm2 or more, while propagation of an axisymmetric LP03 mode is cutoff.
46 more elements
Dependencies are inferred from the claim text.