Patent ID: 11914205
Assignee: FURUKAWA ELECTRIC CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A coated optical fiber in which a primary layer that covers an optical fiber is formed around the optical fiber, and a secondary layer that covers the primary layer is formed around the primary layer, the primary layer and the secondary layer being formed in this order
wherein an effective core cross-sectional area Aeff of the optical fiber at a wavelength of 1550 nm is 130 μm2 or more, and
wherein, when a coating thickness of the primary layer is P (μm),
a coating thickness of the secondary layer is S (μm),
a thermal expansion coefficient of the primary layer is βP (/K),
an elastic modulus (primary elastic modulus) of the primary layer is PISM (MPa), and
an elastic modulus (secondary elastic modulus) of the secondary layer is SISM (MPa),
a condition of the following equations (I), or
a condition of both the following equations (I) and (II) is satisfied

[Math. 1]

491×10−6≤βP×PISM<600×10−6  (I)

(S/P)×(SISM/PISM)≤1000  (II)