Optical fiber

US8135255B2 · kind B2 · utility

Assignee

• SHIN-ETSU CHEMICAL CO., LTD. · JP

Inventors

• Hiroshi Oyamada · Chiyoda, JP
• Yuhei URATA · Shibukawa, JP

Key dates

• Filing date: May 18, 2010
• Grant date: Mar 13, 2012
• Expiry date: Aug 29, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/03627
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Provided is an optical fiber including: a core at a center thereof; a first cladding adjacent to the core to cover a circumference of the core; and a second cladding adjacent to the first cladding to cover a circumference of the first cladding, where 0.35%≦(Δ1−Δ2)≦0.65%, 0.30%≦Δ1≦0.55%, −0.20%≦Δ2≦−0.05%, 0.22≦a/b≦0.34, and 4≦b√|Δ2|≦10 hold, and loss increase resulting when the optical fiber is wound on a mandrel having a diameter of 20 mm is 0.5 dB/turn or smaller at a wavelength of 1550 nm, where Δ1(%) is a specific refractive index difference of a maximum of a refractive index distribution of the core with reference to a refractive index of the second cladding, Δ2(%) is a specific refractive index difference of a minimum of a refractive index distribution of the first cladding with reference to the refractive index of the second cladding, a(μm) is a radius of a boundary between the core and the first cladding with respect to a center of the core, and b(μm) is a radius of a boundary between the first cladding and the second cladding with respect to the center of the core.