Microstructured optical fiber and optical module
AssigneeSumitomo Electric Industries, Ltd.
InventorTakemi Hasegawa
Life of this patent
Estimating the term…
Abstract
A microstructured optical fiber is structured with a core region and a plurality of cladding regions surrounding the core region. Chromatic dispersion is relatively flat over a broad wavelength range with a small effective area, without need for air holes that are unacceptably small. An enlarged effective core area is obtained by selectively closing the holes in the innermost cladding, which holes are smaller and easier to close than the holes in other regions.
Claims13
An optical fiber comprising:
- a core region and a plurality of cladding regions, a first cladding region surrounding the core region, and a (k+1)-th cladding region surrounding a k-th cladding region (k=1, 2, . . . ), wherein
- the first and the third cladding regions have a plurality of sub medium regions distributed in a main medium;
- the sub medium has a lower refractive index than the main medium, the core, the k-th cladding regions (k=1, 2, 3), and the sub medium regions extend along the fiber length;
- the average refractive indices of the core region N[0], and the k-th cladding regions N[k] (k=1, 2, 3) satisfies N[0]>N[1]<N[2]>N[3];
- and
- the chromatic dispersion D(λ) and the effective core area Aeff(λ) of the fundamental mode satisfy
- 3 max λ ∈ Ω { D ( λ ) } - min λ ∈ Ω { D ( λ ) } < 10 [ ps / nm / km ] , max λ ∈ Ω { D ( λ ) } < 20 [ ps / nm / km ] , and min λ ∈ Ω { A eff ( λ ) } < 5 [ μm 2 ] ,
- in a wavelength range Ω={λ|λ1<=λ<=λ2}, where λ1>=1200 [nm], λ2<=1700 [nm], and λ2−λ1>=100 [nm].
An optical fiber wherein chromatic dispersion D(λ) and effective core area Aeff(λ) of the fundamental mode satisfy
- 4 max λ ∈ Ω { D ( λ ) } - min λ ∈ Ω { D ( λ ) } < 10 [ ps / nm / km ] , max λ ∈ Ω { D ( λ ) } < 20 [ ps / nm / km ] , and min λ ∈ Ω { A eff ( λ ) } < 5 [ μm 2 ] ,
- in a wavelength range Ω={λ|λ1<=λ<=λ2}, where λ1>=1200 [nm], λ2<=1700 [nm], and λ2−λ1>=100 [nm] are satisfied.
An optical module comprising:
- an optical fiber wound in a predetermined diameter of less than 150 mm over one or more turns;
- and
- an optical coupling means that couples lightwave in a predetermined wavelength range Ω={λ|λ1<=λ<=λ2} within 1200 nm to 1700 nm to the both ends of the optical fiber;
- wherein
- the optical fiber has a core region, a first cladding region surrounding the core region, and the (k+1)-th cladding region surrounding the k-th cladding region (k=1, 2), where the first and the third cladding regions have a plurality of sub medium regions in main medium, the sub medium has a lower refractive index than the main medium, the core, the k-th cladding regions (k=1, 2, 3), and the sub medium regions are extended along the fiber length;
- the average refractive indices of the core region N[0], and the k-th cladding regions N[k] (k=1, 2, 3) satisfies N[0]>N[1]<N[2]>N[3];
- and
- the chromatic dispersion D(λ) and the effective core area Aeff(λ) of the fundamental mode satisfy
- 5 max λ ∈ Ω { D ( λ ) } - min λ ∈ Ω { D ( λ ) } < 10 [ ps / nm / km ] , max λ ∈ Ω { D ( λ ) } < 20 [ ps / nm / km ] , and min λ ∈ Ω { A eff ( λ ) } < 5 [ μm 2 ] ,
- in a wavelength range Ω={λ|λ1<=λ<=λ2}, where λ1>=1200 [nm], λ2<=1800 [nm], and λ2−λ1>=100 [nm] are satisfied.
Dependencies are inferred from the claim text.