OPTICAL FIBER

摘要

An inexpensive low-attenuation optical fiber 1 suitable for use as an optical transmission line in an optical access network is a silica based glass optical fiber and includes a core 11 including the center axis, an optical cladding 12 surrounding the core, and a jacket 13 surrounding the optical cladding. The core contains GeO2 and has a relative refractive index difference Δcore, based on the optical cladding, greater than or equal to 0.35% and less than or equal to 0.50% and has a refractive index volume v greater than or equal to 0.045 μm2 and less than or equal to 0.095 μm2. The jacket has a relative refractive index difference ΔJ greater than or equal to 0.03% and less than or equal to 0.20%. Glass constituting the core has a fictive temperature higher than or equal to 1400° C. and lower than or equal to 1590° C. Residual stress in the core is compressive stress that has an absolute value greater than or equal to 5 MPa.

主权项

1. A silica based glass optical fiber comprising:
a core including a center axis of the optical fiber; an optical cladding surrounding the core; and a jacket surrounding the optical cladding, wherein the core contains GeO2, a refractive index volume
v=2∫0a Δ(r)·r·dr   (1)of the core is greater than or equal to 0.045 μm2 and less than or equal to 0.095 μm2, where Δ(r) denotes the relative refractive index difference at a radial coordinate r and a denotes the radius of the core,
glass constituting the core has a fictive temperature higher than or equal to 1400° C. 1300° C. and lower than or equal to 1590° C., and residual stress in the core is compressive stress that has an absolute value less than or equal to 30 MPa or tensile stress that has an absolute value less than or equal to 10 MPa.