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US 7,925,132 B2Granted
Nonlinear optical fiber, nonlinear optical device, and optical signal processing apparatus
AssigneeFurukawa Electric Co., Ltd.
InventorsYuki Taniguchi, Jiro Hiroishi, Masanori Takahashi, Ryuichi Sugizaki
Life of this patent
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Abstract
A core includes a center core region, a core layer that is formed around the center core region and that has a refractive index lower than that of the center core region, and at least one buffer core layer that is formed between the center core region and the core layer and that has a refractive index lower than that of the center core region and higher than that of the core layer. A cladding is formed around the core layer and that has a refractive index lower than that of the center core region and higher than that of the core layer. An effective core area at a wavelength of 1550 nm is equal to or smaller than 18 μm2.
Claims10
A nonlinear optical fiber comprising:
- a core including
- a center core region,
- a core layer that is formed around the center core region and that has a refractive index lower than a refractive index of the center core region, and
- at least one buffer core layer that is formed between the center core region and the core layer and that has a refractive index lower than a minimum refractive index of the center core region and higher than the refractive index of the core layer;
- and
- a cladding that is formed around the core layer and that has a refractive index lower than the refractive index of the center core region and higher than the refractive index of the core layer, wherein
- an effective core area at a wavelength of 1550 nanometers is equal to or smaller than 18 μm2,
- a ratio of an outer diameter of the buffer core layer to a diameter of the center core region is equal to or larger than 1.2 and equal to or smaller than 2.0, and
- a relative refractive index difference between the buffer core layer and the cladding is equal to or larger than 0.1% and equal to or smaller than 0.6%.
6 more elements
A nonlinear optical device comprising:
- an optical input unit that inputs a light;
- an optical output unit that outputs a light;
- and
- a nonlinear optical fiber provided between the optical input unit and the optical output unit, wherein
- the nonlinear optical fiber includes
- a core including
- a center core region,
- a core layer that is formed around the center core region and that has a refractive index lower than a refractive index of the center core region, and
- at least one buffer core layer that is formed between the center core region and the core layer and that has a refractive index lower than a minimum refractive index of the center core region and higher than the refractive index of the core layer, and
- a cladding that is formed around the core layer and that has a refractive index lower than the refractive index of the center core region and higher than the refractive index of the core layer,
- an effective core area at a wavelength of 1550 nanometers is equal to or smaller than 18 μm2,
- a ratio of an outer diameter of the buffer core layer to a diameter of the center core region is equal to or larger than 1.2 and equal to or smaller than 2.0,
- a relative refractive index difference between the buffer core layer and the cladding is equal to or larger than 0.1% and equal to or smaller than 0.6%, and
- the nonlinear optical fiber causes a nonlinear optical phenomenon to be generated by the light input from the optical input unit and outputting a light obtained by the nonlinear optical phenomenon to the optical output unit.
11 more elements
An optical signal processing apparatus comprising:
- an optical signal input unit that inputs an optical signal;
- an optical signal processing unit that includes a nonlinear optical fiber, and performs a signal processing of the optical signal input from the optical signal input unit by using a nonlinear optical phenomenon generated in the nonlinear optical fiber;
- and
- an optical signal output unit that outputs the optical signal that is signal processed, wherein
- the nonlinear optical fiber includes
- a core including
- a center core region,
- a core layer that is formed around the center core region and that has a refractive index lower than a refractive index of the center core region, and
- at least one buffer core layer that is formed between the center core region and the core layer and that has a refractive index lower than a minimum refractive index of the center core region and higher than the refractive index of the core layer, and
- a cladding that is formed around the core layer and that has a refractive index lower than the refractive index of the center core region and higher than the refractive index of the core layer,
- an effective core area at a wavelength of 1550 nanometers is equal to or smaller than 18 μm2,
- a ratio of an outer diameter of the buffer core layer to a diameter of the center core region is equal to or larger than 1.2 and equal to or smaller than 2.0, and
- a relative refractive index difference between the buffer core layer and the cladding is equal to or larger than 0.1% and equal to or smaller than 0.6%.
10 more elements
Dependencies are inferred from the claim text.