As the inventor and owner of the technology for placing optical fibers into stainless steel tubes, GL offers a range of tube sizes and fiber counts for a variety of applications. Each tube is flooded with a thixotropic filling compound and hermetically sealed to protect the enclosed fibers from environmental degradation. This product is sometimes referred to as FIST (Fiber in Steel Tube) or FIMT (Fiber in Metal Tube).
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This specification covers general requirements and performance of Stainless Steel Tube Fiber Unit，including optical characteristics and geometrical characteristics
2.1 Steel Tube Specification
|Material||Stainless steel tape|
|Filling component||Water repellent, thixotropic jelly|
|Fiber excess length||%||0.5-0.7|
2.2. Fiber Specification
The optical fiber is made of high pure silica and germanium doped silica. UV curable acrylate material is applied over fiber cladding as optical fiber primary protective coating. The detail data of optical fiber performance are shown in the following table.
2.3 Color Identification of Fiber In the stainless steel tube unit Color code of fiber in the steel tube unit shall be identified referring to the following table:
Typical number of fiber: 48
|Remark||Fiber No. & Color|
|1-12 Without color ring||Blue||Orange||Green||Brown||Grey||White|
|13-24 With S100 color Ring||Blue||Orange||Green||Brown||Grey||White|
|25-36 With D100 color Ring||Blue||Orange||Green||Brown||Grey||White|
|37-48 With T100 color Ring||Blue||Orange||Green||Brown||Grey||White|
|Remark: If G.652 and G.655 are used synchronously, S.655 should be laid ahead.|
3.1 Unless otherwise specified, steel tube shall be supplied by iron-wooden drum.
3.2 Steel tube shall be supplied on reels with the dimensions by agreed specification between the manufacturer and customer before shipping.
3.3 Unless otherwise specified, each package shall be marked with the following between the manufacturer and customer.
3.4 Steel Tube shall be tightly rewinded not to become loose or spring out.
3.5 The drum shall be transported with vertical direction on the ground.
(Drum Direction: H Direction)