G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 6/10 (2006.01)
Patent
CA 2241544
A device for recording a refractive index pattern in a photosensitive optical fibre consists of a rotary disc (3) formed with a phase mask in a circular pattern, which is rotated by an axis (11). The phase mask is illuminated with laser light in region (5) so that a moving interference pattern is formed. The optical fibre (1) is moved along a path in synchronism with the moving interference pattern so that the pattern becomes recorded in the fibre. The pattern can be formed continuously over long fibre lengths e.g. of the order of one metre.
Cette invention concerne un dispositif d'enregistrement d'un diagramme d'indices de réfraction sur une fibre optique photosensible. Ledit dispositif est constitué d'un disque rotatif (3) formé à l'aide d'un masque de phase suivant un motif circulaire, lequel disque tourne autour d'un axe (11). On éclaire le masque de phase avec une lumière de laser dans une région (5) de façon à former un digramme d'interférence mobile. On déplace la fibre optique (1) le long d'un chemin, de manière synchrone avec le diagramme d'interférence mobile, de telle sorte que ledit diagramme est enregistré dans la fibre. On peut former ce diagramme de façon continue sur des segments de longues fibres, lesdits segments pouvant mesurer un mètre environ.
British Telecommunications Public Limited Company
Gowling Lafleur Henderson Llp
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