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US 7,126,748 B2Granted
Optical fiber, optical fiber module, and Raman amplifier
AssigneeFurukawa Electric Co., Ltd.
InventorsRyuichi Sugizaki, Yuki Taniguchi, Takeshi Yagi
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Abstract
An optical fiber has a Raman gain efficiency with a pump power at 1450 nanometers of equal to or more than 4 m/W, and a ratio of a nonlinear parameter γ at a wavelength of 1550 nanometers to the Raman gain efficiency with a pump power of 1450 nanometers is equal to or less than 3.
Claims21
An optical fiber comprising:
- a first core region of an α-shaped profile at a center;
- a second core region surrounding the first core region in which refractive index is lower than the first core region;
- and
- a cladding surrounding the second core region in which refractive index is lower than the first core region and higher than the second core region,
- wherein a relative refractive index difference of the first core region with a cladding region Δ1 is not less than 2.4% and not more than 2.8%,
- a Raman gain efficiency with a pump power at 1450 nanometers of equal to or more than 4 m/W, and
- a ratio of a nonlinear parameter γ at a wavelength of 1550 nanometers to the Raman gain efficiency with a pump power of 1450 nanometers of equal to or less than 3.
4 more elements
An optical fiber module comprising an optical fiber, the optical fiber comprising:
- a first core region of an α-shaped profile at a center;
- a second core region surrounding the first core region in which refractive index is lower than the first core region;
- and
- a cladding surrounding the second core region in which refractive index is lower than the first core region and higher than the second core region,
- wherein a relative refractive index difference of the first core region with a cladding region A1 is not less than 2.4% and not more than 2.8%,
- a Raman gain efficiency with a pump power at 1450 nanometers of equal to or more than 4 m/W, and
- a ratio of a nonlinear parameter γ at a wavelength of 1550 nanometers to the Raman gain efficiency with a pump power of 1450 nanometers of equal to or less than 3.
4 more elements
A Raman amplifier comprising an optical fiber comprising:
- a first core region of an α-shaped profile at a center;
- a second core region surrounding the first core region in which refractive index is lower than the first core region;
- and
- a cladding surrounding the second core region in which refractive index is lower than the first core region and higher than the second core region,
- wherein a relative refractive index difference of the first core region with a cladding region (1 is not less than 2.4% and not more than 2.8%,
- a Raman gain efficiency with a pump power at 1450 nanometers of equal to or more than 4 m/W, and
- a ratio of a nonlinear parameter (at a wavelength of 1550 nanometers to the Raman gain efficiency with a pump power of 1450 nanometers of equal to or less than 3.
4 more elements
Dependencies are inferred from the claim text.