GYXTW Fiber Optic Cable – Everything You Need to Know

GYXTW is a fiber optic cable that can serve overhead, buried and through-tube scenarios according to line design requirements.
Table of Contents

GYXTW is a fiber optic cable that can serve overhead, buried and through-tube scenarios according to line design requirements.

1.What is GYXTW


GYXTW fiber optic cable is constructed by placing a 250lJm fiber into a loose sleeve made of high-modulus material.

This loose sleeve is filled with a waterproof compound.

The loose tubing is wrapped longitudinally with a double-sided plastic coated tape,

A water barrier material between the tape and the loose tubing ensures a good fit and group water barrier,

Two parallel wires on each side of the cable are put in place and the cable is sheathed in polyethylene.


  • Small outer diameter, light weight, easy to build
  • Central design of the bundle tube
  • Near-zero additional attenuation of the fiber. No change in dispersion value
  • Excellent environmental performance
  •  Water barrier design, good resistance to water penetration
  • Excellent tension performance
  • Stable fiber residual length control

3.Model Analysis

GY – Outdoor optical cable for communication

X – Cable centre tube (covered) structure

T – Filled structure

W – Steel bonded sheath with steel wire (W sheath for short)

4.Types of GYXTW

For center bundle cables, the maximum is normally 12 cores.

If it is larger than 24 cores, the same color cores usually have black dots to distinguish them.

There are also single-mode and multi-mode centre bundle tube fiber optic cables.


Conventional single-mode fibre (dispersion non-displaced single-mode fibre).

The shortest cut-off wavelength is available for both 1550NM and 1310NM.

It is characterized by zero dispersion at wavelengths around 1310nm when designed and manufactured, and minimal loss but maximum dispersion at 1550nm.

(The attenuation of the 1310nm window is in the range of 0.3 to 0.4dB/km and the dispersion factor is in the range of 0 to 3.5ps/

The attenuation in the 1550nm window is 0.19-0.25dB/km, with a dispersion factor of 15-18ps/

The main disadvantage is the large dispersion coefficient in the 1550 band, which makes it unsuitable for long-distance applications above 2.5Gb/s.

G.652A⁄B is the basic single-mode fiber.

G.652C⁄D is a low-water peak single-mode fiber. (Compare with IEC standard B1.1,B1.2,B1.3 types respectively)


Non-zero Dispersion-Shifted Fiber (NZ-DSF: Non-zero-Dispersion-Shifted Fiber).

The G.653 fiber has zero dispersion at 1550 nm, while the G.655 fiber has a concentrated positive or negative dispersion, which reduces the negative effects of nonlinear phenomena that interfere with adjacent wavelengths in DWDM systems.

First-generation non-zero dispersion shifted fibers such as PureMetro have the advantage of dispersion equal to or less than 5 ps⁄nm per kilometer, which makes dispersion compensation easier.

Second-generation non-zero dispersion-shifted fibers such as PureGuide have a dispersion of around 10ps⁄nm per kilometer, doubling the capacity of DWDM systems.

5.Structure of GYXTW

Structure of GYXTW

Bunching tubes

The material of the bundle is PBT, which is hard and flexible and resistant to lateral pressure.

If PBT is replaced by PP, the cost can be reduced by half, but the optical fibres inside the fibre optic cable are easily broken during transport and construction.

The colour of PP is translucent.

Coloured optical fibres

Fibre optic cables are given a layer of coloured plastic extruded onto the bare fibres in order to distinguish each core of fibre in communications engineering.

Outdoor fibre optic cables are dyed with a different colour ink for each core of bare fibre, and the colours of the ink are the same as for indoor cables, which are also 12 types.

The Ministry of Information Industry industry standard chromatographic arrangement is as follows: blue, orange, green, brown, grey, this (white), red, black, yellow, purple, pink and lime green.

This color can use instead of white without affecting identification.


To protect the optical fibre,we apply a 250 micron layer of translucent resin to the surface.

The optical fibres make into fibre optic cables and each core’s color is different.

If the fibres coat with 12 different coloured resins during production, there is no need to colour the fibres when in the cable plant use.

The advantage of doing this is to save a coloring process,the disadvantage is that cannot flexibly use the fiber.

Water blocking tape

Water-blocking tape is made up of two layers of non-woven fabric with a water-blocking powder between them.

Once the fibre optic cable is in water, the powder rapidly expands dozens of times after absorbing the water, producing a gel that blocks the water from spreading deeper into the cable.

Non-woven fabric

Some manufacturers will use non-woven fabric, which is much cheaper than water-blocking tape, instead of water-blocking tape to reduce costs. There is no difference in appearance, but once the outer skin of the fibre optic cable is broken, the non-woven fabric cannot stop the water.

Rolled steel tape

The water barrier is covered with rolled steel tape.

The main function of the strip in the fibre optic cable is to resist lateral pressure, tensile strength, and rat bites and to protect the bundle.

Steel wire

On the outside of the strip, there are two parallel steel wires, the purpose of which is to increase the tensile strength of the fibre optic cable.

The grey-coloured wire is phosphate.

The silver-coloured wire is galvanised.

The galvanised wire is more expensive than the phosphate wire.

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