Optical fiber for use in Bragg grating and fiber Bragg grating using the same
First Claim
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1. An optical fiber, comprising:
- a core comprising GeO2—
SiO2, for guiding light; and
a cladding surrounding the core and having a value of refractive index lower than that of the core, said cladding being a glass comprising SiO2 and further comprising a first additive selected from the group consisting of TiO2 and ZrO2.
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Abstract
An optical fiber for use in a fiber Bragg grating and a fiber Bragg grating using the same are provided. The optical fiber includes a core made of a material obtained by adding germanium oxide (GeO2) to silica (SiO2), for guiding light, and a cladding made by adding a material having a negative thermal expansion coefficient to silica (SiO2), the cladding having a refractive index lower than that of the core. Therefore, the change in Bragg wavelength depending on temperature can be minimized by forming the optical fiber using a material having a negative thermal expansion coefficient.
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Citations
22 Claims
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1. An optical fiber, comprising:
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a core comprising GeO2—
SiO2, for guiding light; and
a cladding surrounding the core and having a value of refractive index lower than that of the core, said cladding being a glass comprising SiO2 and further comprising a first additive selected from the group consisting of TiO2 and ZrO2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
a region of the optical fiber having a pattern spacing of refractive index change, for use as a Bragg grating.
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12. The optical fiber of claim 2, further comprising:
a region of the optical fiber having a pattern spacing of refractive index change, for use as a Bragg grating.
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13. A double-cladding optical fiber, comprising:
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a core comprising GeO2—
SiO2, for guiding light;
an inner cladding surrounding the core and having a refractive index lower than that of the core, said inner cladding being a glass comprising SiO2; and
an outer cladding surrounding the inner cladding and having a value of refractive index less than that of the core, said outer cladding being a glass comprising SiO2 and further comprising a first additive selected from the group consisting of TiO2 and ZrO2;
said outer cladding further comprising a second additive selected from the group consisting of fluorine and boron. - View Dependent Claims (14, 15, 16, 18, 19)
a region of the optical fiber having a pattern spacing of refractive index change, for use as a Bragg grating.
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19. The optical fiber of claim 13, said outer cladding further having a value of refractive index higher than that of said inner cladding.
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17. A double-cladding optical fiber, comprising:
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a core comprising GeO2—
SiO2, for guiding light;
an inner cladding surrounding the core and having a refractive index lower than that of the core, said inner cladding being a glass comprising SiO2; and
an outer cladding surrounding the inner cladding and having a value of refractive index less than that of the core, said outer cladding being a glass comprising SiO2 and further comprising a first additive selected from the group consisting of TiO2 and ZrO2;
said optical fiber further comprising;
a region of the optical fiber having a pattern spacing of refractive index change, for use as a Bragg grating.
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20. An optical fiber apparatus, comprising:
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an optical fiber having a pattern spacing of refractive index change, said optical fiber comprising;
a core comprising GeO2—
SiO2, for guiding light; and
an outer cladding surrounding the core and having a value of refractive index lower than that of the core, said outer cladding being a glass comprising SiO2 and further comprising an additive, said additive having a negative value of the thermal coefficient of expansion. - View Dependent Claims (21, 22)
an inner cladding interposed between said core and outer cladding, said inner cladding having a value of refractive index lower than that of the core, and said inner cladding being made of a glass comprising SiO2.
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22. The apparatus of claim 21, said outer cladding further having a value of refractive index higher than that of said inner cladding.
Specification