Optical fiber with large effective area
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United States of America Patent
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Feb 16, 2016
Grant Date -
Oct 22, 2015
app pub date -
Jul 3, 2013
filing date -
Oct 30, 2012
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Abstract
An optical fiber with a large effective area includes a core layer and a cladding layer. The core layer comprises an inner core layer having a radius of 1-4 μm and a relative refractive index difference Δ12 of −0.2%≧Δ12<0% relative to the outer core layer, and an outer core layer having a radius of 4-7 μm and a relative refractive index difference Δ2 of −0.15%-0.05%. Δ12 remains unchanged or increases as the radius of the inner core layer increases. The cladding layer comprises an inner cladding layer cladding the core layer and having a radius of 7-20 μm and a relative refractive index difference Δ3 of −0.5%˜−0.1%, a depressed cladding layer has a radius of 12-40 μm, and a relative refractive index difference Δ4 of −1.0%˜−0.3%, and an outer cladding layer having a relative refractive index difference Δ5 of −0.2%˜−0.4%.
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