Bending insensitive single-mode optical fiber
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United States of America Patent
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May 24, 2016
Grant Date -
May 19, 2016
app pub date -
Mar 4, 2014
filing date -
Jan 10, 2012
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Abstract
In one aspect of the invention, the bend insensitive single-mode optical fiber includes a core layer and cladding layers having an inner cladding layer, a trench cladding layer and an outer cladding layer sequentially formed surrounding the core layer from inside to outside. For the core layer, the diameter is 7-7.9 μm, and the relative refractive index difference Δ1 is between 4.6×10−3 and 6.0×10−3. For the inner cladding layer, the diameter is 15-17 μm, and a relative refractive index difference Δ2 is between −3×10−4 and 3×10−4. For the trench cladding layer, the diameter is 24-33 μm, and the relative refractive index difference Δ3 is between −2.9×10−3 and −7.3×10−3, changes in a gradient manner and increases gradually from outside to inside, where a relative refractive index difference Δ32 at an outermost interface is smaller than a relative refractive index difference Δ31 at an innermost interface.
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