Low-loss few-mode fiber

US9739936B2 · kind B2 · utility

Assignees

• WUHAN RESEARCH INSTITUTE OF POSTS AND TELECOMMUNICATIONS · CN
• FIBERHOME TELECOMMUNICATION TECHNOLOGIES CO., LTD · CN

Inventors

• Qi Mo · 红钢城街道, CN
• Huang Yu · Tainan, TW
• Wen-Jung Chen · New Taipei, TW
• Cheng Du · 红钢城街道, CN
• Zhiqiang Yu · Dongguan, CN
• Dongxiang Wang · 红钢城街道, CN
• Bingfeng Cai · 红钢城街道, CN

Key dates

• Filing date: Nov 3, 2015
• Grant date: Aug 22, 2017
• Expiry date: Nov 3, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/0288
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A low-loss few-mode fiber relates to the technical field of optical communications and related sensing devices, and includes, from inside to outside, a core layer (1), a fluorine-doped quartz inner cladding (2), a fluorine-doped quartz second core layer (3), a fluorine-doped quartz depressed cladding (4) and a fluorine-doped quartz outer cladding (5); germanium element is not doped within the core layer (1), the refractive index of the core layer (1) is in gradient distribution, and the distribution is a power-exponent distribution; the maximum value of difference in relative refractive index between the core layer (1) and the fluorine-doped quartz inner cladding (2) is 0.3% to 0.9%; the relative refractive index difference of the fluorine-doped quartz inner cladding (2) with respect to synthetic quartz is −0.3% to −0.5%; the difference in relative refractive index between the fluorine-doped quartz second core layer (3) and the fluorine-doped quartz inner cladding (2) is 0.05% to 0.2%; the difference in relative refractive index between the fluorine-doped quartz depressed cladding (4) and the fluorine-doped quartz inner cladding (2) is −0.1% to −0.5%; the relative refractive index …