Title :
Graded-index-type crystalline fibre for IR light transmission
Author :
Kachi, S. ; Kimura, M. ; Shiroyama, K.
Author_Institution :
Furukawa Electric Co. Ltd., Central Research Laboratory, Tokyo, Japan
Abstract :
A new method for making a graded-index-type crystalline fibre is proposed. A fibre for IR light transmission with crystalline claddings was desired for improving the reliability of the crystallinc fibre and for avoiding any excess loss at the core surface. A fibre with the core-cladding structure was made by complex extrusion with KRS-5 as the core and KRS-6 as the cladding. Obtaining a smooth core-cladding interface was very difficult. This problem was overcome by a diffusion of composite ions by annealing after the extrusion. The fibre has a concentration distribution that can be accounted for by a GI fibre. The transmission loss of the CO2 laser is 0.2 dB/m with a launching NA of 0.05.
Keywords :
annealing; diffusion in solids; gradient index optics; optical communication equipment; optical fibres; optical workshop techniques; CO2 laser; IR light transmission; KRS-5; KRS-6; TlBr-TlI; TlCl-TlBr; annealing; complex extrusion; composite ion diffusion; core-cladding interface; crystalline claddings; crystalline fibre; graded-index-type; optical fibres; polycrystalline type;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19860158
