Optical fiber preform, optical fiber and method for manufacturing optical fiber

Abstract

The present invention provides an optical fiber preform having a core made of Ge-free silica glass, wherein the core has at least one of the following characteristics (1) and (2) in spectrometry: (1 ) has an absorption peak at a wavelength of 240nm to 255nm; (2) the wavelength at which the ultraviolet transmittance is below 50% is greater than 170nm.

Description

technical field [0001] The present invention relates to an optical fiber preform in which the transmission loss of the spun optical fiber is reduced, an optical fiber obtained by spinning the optical fiber preform, and a method for manufacturing the optical fiber. [0002] This application claims priority based on Japanese Patent Application No. 2015-141567 for which it applied on July 15, 2015, The content is used here. Background technique [0003] Theoretically, it is shown that the so-called pure (pure) silica core optical fiber with pure silica glass as the core and silica glass doped with fluorine as the cladding, and the SiO2 doped with germanium oxide as the core. Silica glass and pure silica glass cladding are used to achieve lower transmission loss than the usual Ge-doped core fiber. This is because the core through which most of the light propagating in the optical fiber passes is made of only silica glass, so there is substantially no concentration fluctuation a...

AI Technical Summary

Problems solved by technology

Therefore, even with a pure silica core fiber, the reduction of Rayleigh scattering is not sufficient, and most of the transmission loss is caused by Rayleigh scattering

Images