Doping optimized single-mode optical fiber with ultra low attenuation

US10018780B2 · kind B2 · utility

Assignee

• YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK LIMITED COMPANY · CN

Inventors

• Lei Zhang · Nanhu, CN
• Shengya Long · Hubei, CN
• Jihong Zhu · Hubei, CN
• Jun Wu · Hubei, CN
• Ruichun Wang · Hubei, CN

Key dates

• Filing date: Oct 4, 2017
• Grant date: Jul 10, 2018
• Expiry date: Oct 4, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/02009
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A doping optimized single-mode optical fiber with ultra low attenuation includes a core layer and cladding layers. The cladding layers has 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 outer cladding layer. The content of fluorine in the core layer is ≤0.5 wt %, ΔGe≤0.12%, Δn1≤0.12%. The content of fluorine in the inner cladding layer is 0.5-1.5 wt %, Δn2≤−0.14%. The content of fluorine in the trench cladding layer is 1-3 wt %, Δn3≤−0.25%. The content of fluorine in the auxiliary outer cladding layer is 0.5-2 wt %, Δn4≤−0.14%. The outer cladding layer is a pure silicon dioxide glass layer and/or a metal-doped silicon dioxide glass layer.