Rare earth-doped double-clad optical fiber and preparation method thereof

US10838143B2 · kind B2 · utility

Assignee

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

Inventors

• Yucheng Yang · Beijing, CN
• Beibei Cao · 红钢城街道, CN
• Xinben Zhang · Hubei, CN
• Hongqi HUANG · Hubei, CN
• Peng Wang · Beijing, CN
• Tianyong Yue · Hubei, CN

Key dates

• Filing date: Sep 17, 2017
• Grant date: Nov 17, 2020
• Expiry date: Sep 25, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S3/06733
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A rare earth-doped double-clad optical fiber includes a rare earth ion-doped fiber core, an inner cladding layer, and an outer cladding layer. A cross section of the inner cladding layer is a non-circular plane including at least two arcuate notches. According to the provided optical fiber, optical processing can be performed on a preform without changing a preform preparation process and a drawing process. The inner cladding is designed to have a non-circular planar structure having a cross section with at least two arcuate notches. While maintaining the same light absorption efficiency of pump light within the cladding layer, a preform polishing process is simplified, a risk of cracking the preform during polishing of multiple surfaces and a risk of contamination of the preform caused by impurities are reduced, wire drawing control precision is better, and comprehensive performance of the optical fiber is improved.