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Regular Fiber optic cable's structure and application

Regular Fiber optic cable's structure and application

2021-09-24

Commonly used communication optical cables are introduced in two parts: ordinary optical cables and FTTH drop-in optical cables.


1 Ordinary optical cable

Ordinary optical cables, including commonly used GYTA optical cables (commonly known as "pipeline optical cables"), GYTS optical cables (commonly known as "overhead optical cables"), and GYTA53 optical cables (commonly known as "direct buried optical cables")


1.1 Duct Optical Cable (GYTA)

GYTA fiber optic cable is a stranded structure. Put the optical fiber into the loose tube, and fill the tube with waterproof compound. The center of the cable core is a metal reinforced core. For some fiber optic cables, a layer of polyethylene (PE) needs to be squeezed outside the metal reinforced core. The loose tube (and filling rope) is twisted around the central reinforcing core to form a compact circular cable core, and the gaps in the cable core are filled with water blocking fillers. Plastic-coated aluminum tape (APL) is longitudinally wrapped and then extruded into a cable with a polyethylene sheath. GYTA optical cable has good waterproof performance and is suitable for occasions where pipe laying is the main method, and overhead laying can also be used. 

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1.2 Overhead optical cable (GYTS)

The core structure of GYTS optical cable is the same as that of GYTA. The difference is that its sheath is double-sided chrome-plated plastic coated steel tape (PSP) + polyethylene. Compared with GYTA fiber optic cable, GYTS fiber optic cable has better resistance to lateral pressure and is suitable for scenarios that require greater pressure on the side of the fiber optic cable. In the pipeline laying method. 

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1.3 Directly buried optical cable (GYTA53)

GYTA53 fiber optic cable can be understood as the outer sheath of GYTA fiber optic cable after being armored with double-sided chrome-plated plastic coated steel tape (PSP), and finally extruded into a cable with a polyethylene outer sheath. GYTA53 optical cable has good waterproof, anti-side pressure, and anti-stretch properties, and is suitable for direct-buried laying. Due to the high cost of direct-buried optical cables and the inability to expand the capacity, the direct-buried method is no longer used for newly-built optical cable lines. Directly buried optical cables are mainly used for the maintenance of the original directly buried optical cable lines. 

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2 FTTH drop cable

FTTH drop cable is mainly used for the drop-in section of FTTH (from the fiber optic cable distribution box to the user's home ONT equipment), which is divided into ordinary butterfly drop cable (GJXH), self-supporting butterfly drop cable (GJYXFCH), and preformed end Butterfly-shaped drop cable, invisible butterfly cable and pre-finished invisible optical cable.


2.1 Ordinary butterfly drop optical cable (GJXH)

GJXH optical cable is to place the optical fiber in the center, two parallel steel wires are placed on both sides as strengthening elements, and the low-smoke halogen-free flame-retardant sheath is extruded into the cable.

GJXH optical cable has 1 or 2 cores in common use, the short and long axis dimensions of the sheath are 2mm and 3mm respectively, and the short-term allowable tensile force (minimum) is 200N. It should be laid along walls or through pipes, and should not be suspended. 

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2.2 Self-supporting butterfly drop optical cable (GJYXFCH)

GJYXFCH optical cable is a non-metallic ordinary butterfly drop optical cable (GJFXH) with a reinforced element (steel wire or wire rope) attached to the outside. The common core number of GJYXFCH optical cable is 1 or 2 cores, and the allowable tensile force (minimum) is 600N. It can be placed in the air for short distances (less than 50 meters), and is suitable for introduction from outdoors to indoors. 

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Fiber hope, as a professional fiber optic cable manufacturer, welcome to inquiry!


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