Large core number indoor optical cable and preparation method thereof

Abstract

The invention discloses a large core number indoor optical cable and a preparation method thereof. The optical cable comprises a number of cable cores arranged in a sheath. A high temperature resistance low friction material evenly coats around each cable core. Each cable core successively comprises an optical fiber, an aramid fiber layer which is evenly arranged outside the optical fiber and an inner sheath which semi-tightly wraps the aramid fiber layer from the center to the periphery. According to the invention, each cable core is coated by the high temperature low friction material, which reduces the friction coefficient between the cable core and the sheath; the friction between each cable core and the sheath is reduced; the temperature resistance level of each cable core is improved; cable core and sheath adhesion at a high temperature is prevented; each cable core can continue to independently move in the process of temperature cycling; small radius of a bent cable core in the sheath is avoided; the temperature cycling performance is improved; the size of each cable core of the optical cable is greatly reduced; the weight of the whole optical cable is reduced; materials are saved; a tight-buffered optical fiber in a wiring optical cable is replaced; and the strength of the optical cable is improved.

Description

technical field [0001] The invention relates to an indoor optical cable, in particular to an indoor optical cable with a large number of cores and a manufacturing method thereof. Background technique [0002] In recent years, with the leap-forward development of optical communication technology, human beings are about to realize the evolution of FTTN, FTTC, FTTZ, FTTB, FTTH, and FTTD communication methods. Internet, cable TV network and power network), so that broadband access technology continues to innovate, so the requirements for indoor optical cables are getting higher and higher. [0003] At present, the commonly used large-core indoor optical cables include distribution optical cables and branch optical cables, which have been widely used in equipment interconnection and building wiring, but each has its own shortcomings. [0004] For distribution cables with tight-buffered optical fibers as the core, the main disadvantages are as follows: [0005] (1) During the ex...

AI Technical Summary

Problems solved by technology

[0005] (1) During the extrusion process of the sheath, the tight sleeve layer and the sheath are easy to adhere;

[0006] (2) The problem of large light attenuation is prone to occur in the process of high and low temperature;

[0007] (3) The tight-buffered optical fiber does not have enough strengthening components, and the strength is not enough, so that it cannot be used for long-distance use

[0009] (1) The outer diameter of the branch optical cable is generally large, and it needs to occupy a lot of space during use;

[0010] (2) The branch optical cable is heavy, which brings a lot of inconvenience to the construction;

[0011] (3) The branch optical cable requires a lot of materials and high cost

However, during the extrusion process of the sheath, flame-retardant and halogen-free materials are prone to the problem of adhesion between the cable core and the sheath, resulting in a higher optical transmission power than the customer's standard, and even the phenomenon that the cable core is broken; at the same time, the flame-retardant and halogen-free materials The thermal shrinkage and thermal expansion and contraction of the sheath during the temperature cycle are relatively obvious. When the temperature difference is large, the cable core will be driven to move. Due to the insufficient rigidity of the cable core and the high friction with the sheath, the bending radius of the cable core is too small. , resulting in large light attenuation, which cannot meet the national standard and customer requirements

Images