Title :
ESR study on loss increase of 500°C heat-treated Ge-doped optical fibres
Author :
Nakahara, Mizuki ; Ohmori, Yutaka ; Itoh, Hayato
Author_Institution :
NTT Ibaraki Electrical Communication Laboratory, Tokai, Japan
Abstract :
Spectral changes of ESR signals due to germanium associated Ge(3) centres were observed on heat-treated optical fibres and preforms. The defect centres essentially exist in as-drawn fibres, even if preforms have been oxidised prior to drawing. The 500°C heat treatment of Ge-doped fibres caused a remarkable decrease in the ESR intensity of Ge(3) centres, subsequently causing optical loss increase around the 1.39 ¿m wavelength.
Keywords :
germanate glasses; heat treatment; losses; optical fibres; paramagnetic resonance of defects; silicon compounds; 1.39 micron wavelength; 500°C; ESR study; Ge doping; Ge(3) centres; SiO2-GeO2; defect centres; electron spin resonance; germanate glasses; heat treatment; optical fibres; optical loss; preforms; silica glass;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19830682
