Small core-diameter graded-index optical fiber

US10823910B2 · kind B2 · utility

Assignee

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

Inventors

• Wufeng Xiao · Hubei, CN
• Runhan Wang · Hubei, CN
• Rong Huang · Longbeilingcun, CN
• Halying Wang · Hubei, CN
• Anlin Zhang · Hubei, CN
• Di Yang · Beijing, CN
• Tiejun Wang · Lin'an, CN

Key dates

• Filing date: Aug 16, 2019
• Grant date: Nov 3, 2020
• Expiry date: Aug 16, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/0365
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A small core-diameter graded-index optical fiber include a core layer and a cladding having an inner cladding layer, a depressed cladding layer, and an outer cladding layer from inside to outside thereof. The core layer has a parabolic refractive index profile with a distribution index in a range of 1.9-2.1, a radius in a range of 10-21 μm, and a Δ1 max in a range of 0.7-1.7% at a core layer center, and is a silica glass layer co-doped with germanium, phosphorus, and fluoride. The inner cladding layer is a pure silica layer or an F-doped silica glass layer, and has a unilateral width in a range of 0.5-5 μm and a Δ2 in a range of −0.4-0%. The depressed cladding layer has a unilateral width in a range of 2-10 μm and a Δ3 in a range from −0.8% to −0.2%. The outer cladding layer is a pure silica glass layer.