SELECTION OF FTTH DROP CABLE

FTTH (Fiber To The Home) is the access method that take optic fiber media to connect the communication office and the home. FTTH Drop cable refers to drop cable from the fiber optic distribution box to optical cable terminal facility. The FTTH line is composed of FTTH Drop cable, fiber terminal facilities and auxiliary facilities for cable laying, such as PVC pipes.

At present, there are a variety of FTTH Drop cables suitable for FTTH Last mile construction , Their performances have their own advantages and disadvantages, and applicable scenarios are also different.

Today, we will introduce several kinds of ftth cable that are widely used in the market from the performance characteristics and applicable scenarios, hoping to help you make reference suggestions when selecting ftth drop cable .

1. Butterfly bowe type drop cable

This fiber optic cable has two forms of strength member :non-metallic and metal . Considering lightning protection and anti-strong electric interference, non-metallic strengthening member type one should be used indoors.Non-metallic reinforcements in FRP (fiberglass) and KFRP (aramid fibers) two type .glass fiber reinforcement (FRP Strength) has good rigidity and is suitable for the use of threading pipes.

The drop cable with aramid fiber reinforcement( KFRP Strength) is suitable for wires along the corner of the wall and other scenes that need to turn at right angles

Due to the fact that small bending radius turns are often encountered in the laying environment , in order to reduce the additional bending loss caused by the small bending radius of cable .and reduce the risk of breakage of optical fibers in a long-term bending state (that is, to improve Optical fiber mechanical reliability), the optical fiber used in the ftth drop cable should use G.657.A2 optical fiber.

The fiber core normally take 1core 2core ,4core 8core used more for FTTB

Table 1 shows the bending radius of the indoor drop cable with different optical fibers

Table 1 Mini bending radius of FTTH drop cable

2. Air-blown fttx drop cable 

Air-blown micro -cables only need to pre-deploy the corresponding a micro-duct system in the network. In the initial stage, it is only to lay out optical cables with appropriate capacity The capacity will be expanded in stages, and the micro cable will be blown into the sub-pipes of the established parent pipe in batches, according to the development needs, it avoids a large number of fiber cable are idle ; it can add fiber optic cable branches at any time .Y-shaped connectors will be used to reduce the joints of optical cables, and fiber optic cable can be replaced easy at any time .When laying the micro cable under a small force, the probability of failure during the construction of the optical cable is greatly reduced. Because of the initial investment cost is low, and the installation speed of air blowing is fast. Therefore, this solution will become the best choice for FTTx network deployment of various telecommunication operators in the future.

The fiber unit SFU type as figure 2

3.For the old residential areas, in many cases, it is necessary to add new optical cable lines to the existing multi-dwelling unit (MDU).

the Ftth drop cable laying method is generally installed by traction to the pipes . it requires a lot of time and is difficult to made the drop cable into in existing pipelines in installation .So that small-sized low-friction ftth drop cable are emerged

As shown in the table, it is a low-friction ftth drop cable.

4.Round type tight buffer  FTTH drop cable

The traditional bowe shaped ftth drop cable has shortcomings in the cable structure. When it is laid horizontally, water and ice are easy to accumulate in the groove, which increases the attenuation of the optical fiber. In addition, due to the flat structure design, it is easy to twist during the laying process. Once the number of twisting turns is too much, the optical fiber is easy to break.

For this reason, The manufacturer have developed round drop optic cables . In terms of structure, it is similar to the conventional simplex tight-buffer indoor cable. It has the advantages of torsion resistance, bending resistance, good tensile performance, environmental protection, flame retardant effect, wide temperature range, etc., and the cable has no groove which reduction Fiber attenuation increase probability

Three typical round drop cable structures are shown in Figure 4

       3.0mm Simplex TPU Drop Cable                                                         Fig 8 Tight buffer Drop  Cable

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