Optical fiber and optical fiber preform

Details Optical fiber and optical fiber preform Optical fiber and optical fiber preform

2007-09-13

2010-11-16

Peace, Rhonda S (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

C385S126000

Reexamination Certificate

active

07835609

ABSTRACT:
An optical fiber is constituted by: a three-layer structured core which includes, a first core (having a relative refractive index difference of Δ1in a region of a radius of R1), a second core (having a relative refractive index difference of Δ2in a region from the radius R1to a radius of R2), and a third core (having a relative refractive index difference of Δ3in a region from the radius of R2to a radius of R3), wherein the relative refractive index differences have relationships of Δ1>Δ2, Δ3>Δ2, and Δ3>Δ1, when Δ1−Δ2=X and Δ3−Δ2=Y, (X+Y)>0.4% is satisfied, and X and Y satisfy 0.25%<X<0.6%, 0.1%≦Y≦0.6%, and a relationship of (2*X−0.7)%<Y<(X/2+0.4)%, thereby satisfying the G652 standard and having an SBS threshold equal to or higher than that of an optical fiber having the same MFD by +3 dB or higher.

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