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

Volume

22

Issue

5

fYear

1986

Firstpage

230

Lastpage

231

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;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:19860158

Filename

4256347