JPH0269306U

JPH0269306U -

Info

Publication number: JPH0269306U
Application number: JP14666288U
Authority: JP
Priority date: 1988-11-11
Filing date: 1988-11-11
Publication date: 1990-05-25

Description

[Brief explanation of drawings]

第１図は本考案による単心光ケーブルの破断構
造を表す斜視図、第２図は加熱処理時間とその後
のシースの収縮量との関係を表すグラフ、第３図
は光フアイバ素線の開口数と温度によるその伝送
損失の増加量との関係を表すグラフである。又、図中の符号で、２はコア部、３はクラツド
部、４は一次被覆層、５は光吸収層、６は二次被
覆層、７は抗張力繊維、９は耐熱テープ、１０は
シースである。 Figure 1 is a perspective view showing the fractured structure of the single-core optical cable according to the present invention, Figure 2 is a graph showing the relationship between heat treatment time and the amount of shrinkage of the sheath afterward, and Figure 3 is the numerical aperture of the optical fiber. 2 is a graph showing the relationship between the amount of increase in transmission loss and the amount of increase in transmission loss due to temperature. In addition, the symbols in the figure are: 2 is the core part, 3 is the clad part, 4 is the primary coating layer, 5 is the light absorption layer, 6 is the secondary coating layer, 7 is the tensile strength fiber, 9 is the heat-resistant tape, and 10 is the sheath. It is.

Claims

[Scope of Claim for Utility Model Registration] (1) An optical fiber strand consisting of a core part and a cladding part surrounding the core part and having a numerical aperture of 0.25 or more, and a silicone resin strand surrounding the optical fiber strand. A primary coating layer, a secondary coating layer made of fluororesin surrounding this primary coating layer, a stranded portion of tensile strength fibers surrounding this secondary coating layer, and a heat-resistant tape layer wound around this stranded portion. and a fluororesin sheath containing needle-shaped crystals of a heat-resistant compound oriented along the optical fiber and surrounding the heat-resistant tape layer. (2) An optical fiber consisting of a core and a cladding surrounding the core and having a numerical aperture of 0.25 or more, a primary coating layer made of silicone resin surrounding the optical fiber, and the primary coating. a black light absorbing layer that is formed inside the layer so as not to be in contact with the optical fiber strand or that surrounds the outside of the primary coating layer;
A secondary coating layer made of fluororesin surrounding the black light absorption layer and the primary coating layer, a stranded portion of tensile strength fibers surrounding this secondary coating layer, and a heat-resistant tape layer wound around this stranded portion. and a fluororesin sheath containing needle-shaped crystals of a heat-resistant compound oriented along the optical fiber and surrounding the heat-resistant tape layer.