Slotted rod for optical fibre and optical fibre using slotted rod
A technology for slotted rods and optical cables, which is applied in the directions of light guides, optics, optical components, etc., can solve the problems of being unsuitable for optical cables, and the elasticity of the slotted rods 50 is deteriorated.
Inactive Publication Date: 2003-12-03
FURUKAWA ELECTRIC CO LTD +1
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Problems solved by technology
[0010] However, since the outermost layer 56 of the channel bar 50 is formed of a solid layer, the elasticity of the channel bar 50 becomes poor.
Thus, for example, if the outermost layer 56 is thickened to increase the number of optical fibers to be accommodated, there is a risk that the elasticity of the grooved rod 50 will deteriorate, making the grooved rod unsuitable for a cable
Method used
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Embodiment Construction
[0024] Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
[0025] exist figure 1 In (a), a grooved rod having the characteristics of the preferred embodiment for a fiber optic cable is shown by a schematic cross-sectional view, in figure 1 In (b), a schematic cross-sectional view is enlarged and shown with figure 1 (a) An optical fiber of the grooved rod shown.
[0026] Such as figure 1 As shown in (a), in the preferred embodiment, the grooved rod 10 is configured with a tensile strength member 11 and an optical fiber containing body 12 . The fiber housing 12 is constructed with an inner layer 15 and an outer layer 16 . The above-mentioned inner layer 15 is provided on the outer periphery of the tensile strength member 11, and is composed of a solid layer such as a thermoplastic resin or the like.
[0027] The above-mentioned outer layer 16 is formed on the outside of the above-mentioned inner layer 15...
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A slotted rod (10) for an optical fiber cable having optical fiber receiving grooves (14) formed in the outer circumferential portion of an optical fiber receiving body (12), wherein at least the regions of the optical fiber receiving body (12) where the optical fiber receiving grooves (14) are formed are constructed of a foam to prevent deterioration in the flexibility of the slotted rod (10) and a solid layer with a smooth surface is formed on at least that inner circumferential surface portion of each optical fiber receiving groove (14) kept in contact with optical fibers. An optical fiber cable formed by housing optical fibers in each optical fiber receiving groove (14) and coating the outer periphery of the slotted rod (10) with a covering layer, wherein optical fibers received in optical fiber receiving grooves (14) are not bent by the wall surfaces of the grooves to prevent an increase in optical loss of optical fibers.
Description
technical field [0001] The present invention relates to a grooved rod (slotted rod) constituting a fiber optic cable for optical transmission, and also to a fiber optic cable using such a grooved rod. Background technique [0002] There are many types of fiber optic cables, one of which is a slotted fiber optic cable. The grooved cable has a grooved rod. The grooved rod accommodates an optical fiber and protects the optical fiber from external pressure during factory production, coiling and laying, or under various conditions after laying, thereby preventing the optical fiber from being damaged. [0003] In addition, in this specification, "optical fiber" is used to generally mean a single optical fiber, an optical fiber group having many optical fibers bundled together, a ribbon-shaped optical fiber in which some optical fibers are arranged in parallel to each other and covered with a common shield. Fiber optic term. [0004] Figure 5 (a) is a schematic sectional view o...
Claims
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IPC IPC(8): G02B6/44
CPCG02B6/4408G02B6/44
Inventor 小林一郎今田荣治长谷见明男上仓康弘岩田秀行
Owner FURUKAWA ELECTRIC CO LTD