Optical fiber for fiber bragg grating
AssigneeSumitomo Electric Industries, Ltd.
InventorsTakuji NAGASHIMA, Shigehiro NAGANO
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Abstract
An optical fiber having a composition that is most suitable from the viewpoint of filter formation time and filter properties of slanted fiber grating (SFG) is provided. An optical fiber made of silica-based glass comprises a core region, which does not contain GeO2 and includes the optical axis, and a cladding region formed around the core region. The cladding region has a refractive index smaller than that of the core region and contains GeO2 of 6.8 wt % or more. SFG made with the optical fiber enables base loss of 2 dB or less, peak wavelength shift of 1.2 nm or less, and change of 0.2 nm or less in width at half maximum.
Claims11
An optical fiber made of silica-based glass, comprising:
- a core region including an optical axis of the fiber and
- a cladding region formed around the core region, the cladding region having a refractive index smaller than a refractive index of the core region and containing GeO2 having a concentration of 6.8 wt % or more at least at a part thereof.
An optical fiber made of silica-based glass, comprising:
- a core region including an optical axis of the fiber and
- a cladding region formed around the core region, the cladding region having a refractive index smaller than a refractive index of the core region and containing GeO2 having a concentration of 7.4 wt % or more and 8.7 wt % or less at least at a part thereof, said part having an outer diameter, the outer diameter being 1.5 to 4.0 times larger than a mode field diameter at a wavelength in the C-band.
Dependencies are inferred from the claim text.