Single-mode fiber with ultralow attenuation and large effective area
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United States of America Patent
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Jan 23, 2018
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app pub date -
Mar 2, 2017
filing date -
Nov 12, 2014
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Abstract
A single-mode fiber with an ultra-low attenuation and a large effective area includes a core layer having a radius of 4.8 to 6.5 and a relative refractive index difference Δn1 of −0.06% to 0.10%, and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The inner cladding layer has a radius of 9 to 15 μm and a relative refractive index difference of −0.40% to −0.15%. The trench cladding layer has a radius of 12 to 17 μm and a relative refractive index difference of −0.8% to −0.3%. The auxiliary outer cladding layer has a radius of 37 to 50 μm and a relative refractive index difference of −0.6% to −0.25%. The outer cladding layer is a pure-silicon-dioxide glass layer.
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