Double pass technique for fabricating compact optical fibre rocking filters

Author

Psaila, D.C. ; De Sterke, C. Martijn ; Ouellette, F.

Author_Institution

Opt. Fibre Technol. Centre, Sydney Univ., NSW, Australia

Volume

31

Issue

13

fYear

1995

fDate

6/22/1995 12:00:00 AM

Firstpage

1093

Lastpage

1094

Abstract

By using the photosensitivity of Ge-doped birefringent fibres, efficient narrowband rocking filters have been fabricated that, to the authors´ knowledge, are the shortest in length per unit beat length to date. This has been achieved by using a point-by-point external writing process in which a UV beam periodically exposes sections of an elliptically-cored fibre. Alternate sections are exposed from opposite sides of the fibre, effectively doubling the coupling strength per beat length. Alignment with the fibre axes is assisted by use of a keyed optical fibre

Keywords

birefringence; compensation; diffraction gratings; optical fibre fabrication; optical fibre filters; optical fibre polarisation; sensitivity; Ge-doped birefringent fibres; GeO₂-SiO₂; UV beam; alignment; beat length; compact optical fibre rocking fibre filter fabrication; coupling strength; double pass technique; elliptically-cored fibre; fibre axes; keyed optical fibre; periodically exposes; photosensitivity; point-by-point external writing process;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:19950705

Filename

392650