G - Physics – 01 – B
Patent
G - Physics
01
B
73/111, 324/30,
G01B 9/00 (2006.01) G01B 11/00 (2006.01) G01B 11/08 (2006.01) G01M 11/00 (2006.01)
Patent
CA 1189315
ABSTRACT OF THE DISCLOSURE Process and apparatus for measuring the effective diameter of the guided mode in a monomode optical fibre. The apparatus comprises, for example, a lighting source such as a tungsten filament, quartz-halogen lamp, a monochromator for selecting light of wave- length .lambda. from the lamp, as well as a variable aperture lens. The image of the source is performed on the input face of the fibre by means of the lens, said image having a size greater than the diameter of the fibre core. The light from the source falls on the fibre in accordance with a cone having an apex halfangle 0. The lighting power P(0) transmitted by the fibre is measured as a function of 0 and the effective diameter 2wo is determined by the formula P(0) = P? [1 - exp (-2( 2wo2/ 2) sin2 0)] in which P? is independent of 0. Application to the characterization of monomode fibres. (Fig. 1)
413152
Alard Francis
Jeunhomme Luc
Alard Francis
Goudreau Gage Dubuc
Jeunhomme Luc
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