Optical fiber with large effective area

Details Optical fiber with large effective area Optical fiber with large effective area

2008-02-21

2009-10-13

Petkovsek, Daniel (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

C385S126000

Reexamination Certificate

active

07603015

ABSTRACT:
An optical fiber comprising: a glass core extending from a centerline to a radius R1; a glass cladding surrounding and in contact with the core, the cladding comprising: a first annular region extending from R1to a radius R2, the first annular region comprising a radial width, W2=R2−R1, a second annular region extending from R2to a radius R3, the second annular region comprising a radial width, W3=R3−R2, and a third annular region extending from R3to an outermost glass radius R4; wherein (i) the core comprises a maximum relative refractive index, Δ1MAX, relative to the third annular region; (ii) wherein the first annular region comprises a radial width W2; and (iii) the second annular region comprises a minimum relative refractive index, Δ3MIN, relative to the third annular region wherein Δ1MAX>Δ2MAX>Δ3MIN, and Δ2MIN>Δ3MIN; and the core and the cladding provide a fiber with cable cutoff less than 1500 nm, dispersion at 1550 nm less than 12 ps
m/km, effective area at 1550 nm greater than 60 μm2, and preferably greater than 70 μm2. The second annular cladding region may contain a plurality of randomly dispersed holes.

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