Bending loss evaluation of single-mode fibres with arbitrary core index profile by far-field pattern

Author

Miyamoto, Matsuhiro ; Sakai, Tetsuya ; Yamauchi, Ryozo ; Inada, Koichi

Author_Institution

Fujikura Ltd., Chiba, Japan

Volume

8

Issue

5

fYear

1990

fDate

5/1/1990 12:00:00 AM

Firstpage

673

Lastpage

677

Abstract

An evaluation of the bending loss of single-mode fibers based on the measured mode field is described. The field decay constant and the normalized field intensity in the cladding are determined. Experimental results verified the validity of this method. Its accuracy is determined by the accuracy of field measurement. The mode field is calculated from the far-field distribution measured with finite dynamic range of more than 50 dB. Far-field measurement with finite dynamic range limits the accuracy of field evaluation. Dispersion shifted fibers are easier for evaluation because of the wider far-field distribution. Bending loss and mode field diameter can be measured simultaneously, and the method is applicable to any single-mode fibers with a matched clad structure. A microbending loss formula is also determined by the decay constant and the normalized field intensity in the cladding as well as uniform bending loss

Keywords

bending; fibre optics; optical losses; refractive index; arbitrary core index profile; bending loss; cladding; dispersion-shifted fibres; far-field distribution; far-field pattern; field decay constant; field measurement; field measurement accuracy; finite dynamic range; matched clad structure; microbending loss formula; mode field; normalized field intensity; single-mode fibres; Dynamic range; Equations; Loss measurement; Optical fiber cables; Power cables; Propagation constant; Refractive index; Wavelength measurement;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.54473

Filename

54473