Single mode optical fiber with large effective area
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United States of America Patent
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Dec 8, 2015
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Jul 3, 2013
filing date -
Oct 30, 2012
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Abstract
A single-mode fiber with a large effective area comprises a core layer and a cladding layer. The core layer is cladded with an intermediate cladding layer, and a depressed cladding layer is provided outside the intermediate cladding layer. The core layer comprises a first fiber sub core layer having a radius r1 of 1.5-5 μm and a relative refractive index difference Δn1 of 0.05-0.22%, and a second sub core layer having a unilateral radial width (r2−r1) of 1.5-5 μm and a relative refractive index difference Δn2 of 0.15-0.34%, where Δn1 is less than Δn2. Accordingly, the optical fiber can reach an effective area equal to or greater than 120 μm2 when the related parameters thereof are optimized.
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