THE ABSORPTION CHARACTERISTICS OF CIRCULAR, OFFSET, AND RECTANGULAR DOUBLE-CLAD FIBERS

Authors
Citation
Ap. Liu et K. Ueda, THE ABSORPTION CHARACTERISTICS OF CIRCULAR, OFFSET, AND RECTANGULAR DOUBLE-CLAD FIBERS, Optics communications, 132(5-6), 1996, pp. 511-518
Citations number
5
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Optics
Journal title
ISSN journal
0030-4018
Volume
132
Issue
5-6
Year of publication
1996
Pages
511 - 518
Database
ISI
SICI code
0030-4018(1996)132:5-6<511:TACOCO>2.0.ZU;2-O
Abstract
The absorption characteristics of circular, offset, and rectangular do uble-clad fibers are investigated with phenomenological, simple, and c omprehensible 2-D analysis models. For offset and rectangular fibers, almost all propagation rays are absorbable, so it is possible to achie ve very high absorption efficiency. However, for circular fibers, it i s not, there are few absorbable rays and absorption is lower. The depe ndence of absorption on fiber length is calculated with 3-D ray tracin g simulations. The calculation indicates that, for circular fibers, th e bend radius influences the absorption efficiency markedly. But for r ectangular and offset fibers, the bend effect is negligible. The effec tive absorption coefficients of offset and rectangular fibers are prop ortional to doped concentration and area ratio of core to first claddi ng. The influences of offset distance for offset fibers, as well as cr oss section shape for rectangular ones on absorption is also discussed .