G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/18 (2006.01) H01S 3/067 (2006.01) H01S 3/13 (2006.01) H04J 14/02 (2006.01) G02B 6/38 (2006.01)
Patent
CA 2207761
A diffraction grating portion (12) is formed in an optical fiber (10), having a diameter of 125 µm and serving to transmit light, along its optical axis. The optical fiber is concentrically surrounded by a lower coating portion (14) having an outer diameter of 300 µm and consisting of a silicone resin. The lower coating portion is concentrically surrounded by a coating portion (16) having an outer diameter of 900 µm and consisting of a liquid crystal polymer, e.g., polyester amide. The coating portion is further surrounded by an outermost coating portion (18) having an outer diameter of 1 mm and consisting of a UV curing resin colored for identification. Both the optical fiber (10) and the lower coating portion (14) have positive thermal expansion coefficients. In contrast to this, the coating portion (16) consisting of the liquid crystal polymer has a negative thermal expansion coefficient.
Cette invention concerne un réseau de diffraction à fibre optique, lequel fait appel à une fibre optique (10) d'un diamètre de 125 mu m possédant un réseau de diffraction le long de son axe optique. Cette fibre comporte en outre un revêtement coaxial de résine silicone (14) d'un diamètre externe de 300 mu m, un autre revêtement coaxial d'un polymère à cristaux liquides (16), comme de l'amide de polyester, d'un diamètre externe de 900 mu m, et enfin, un dernier revêtement (18) possédant un diamètre externe de 1 mm et consistant en une résine couleur solidifiée par UV et servant à l'identification. La fibre optique (10) et le revêtement (14) possèdent des coefficients de dilatation thermique positifs, tandis que le revêtement de polymère à cristaux liquides (16) possède un coefficient de dilatation thermique négatif.
Inoue Akira
Iwashima Toru
Shigehara Masakazu
Shigematsu Masayuki
Terasawa Yoshiaki
Marks & Clerk
Sumitomo Electric Industries Ltd.
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