One of the important characteristics of the optical cable, affecting its operating parameters, is stiffness. It is known that the stiffness of the optical cable increases at low temperatures due to increase in stiffness of the individual elements of the cable: outer and inner jacket, PBT loose tube and etc. However, as shown by the results of the research, the hydrophobic filling, used in optical cables, also influences on the optical cable stiffness at low temperatures. Results of researches of influence of a hydrophobic filling on stiffness are given in article.
Results of research of the gel-filled optical cable at low temperatures are presented in article. It is shown that stiffness of tubes of an optical cable increases at low of temperature more strongly if in tubes there is a hydrophobic filling compound.
This paper presents the investigate of mechanical loadings applied to the optical cables module structure at low temperatures. Mechanical loads experienced by the optical cable in the process of construction of fiber-optic communication lines, and in the course of their operation, are major factors affecting the reliability and service life optical cable. Over the past few years, optical cable modular design greatly supplanted other modifications, so in this article addresses the evaluation of mechanical loads applied to the modular design cables at low temperatures.
In this article the new method of determination of optical cable stiffness at low temperatures is offered. The method is allows to simplify process of measurements. Thus presence of technicians at climatic chamber in the course of measurements is not required.
Results of experimental researches of "optical microcable in a microduct" system stability to effect of freezing water are
presented. It is shown this system is steadier to water freezing in comparison to lighten optical cable in protective
In article results of experimental researches of incrementation of attenuation in an optical fiber at deformation of loose
tubes are presented. The loose tubes with 4, 8, 12 fibers made from polybutyleneterephthalate were exposed to tests. It is
shown that critical value of deformation of a loose tube at which registered incrementation of attenuation exceeds
threshold value of losses (0,05 dB), changes depending on the square of the area of cross section of loose tube without
fibers practically under the linear principle. The received results of researches can be used for the forecast of optical
cable stability to influence of crushing loadings.
In article results of experimental researches of optical cable behavior in microducts at water freezing are presented. Researches were
carried out with the polymeric and steel microducts. Researches have shown that loadings which influence on a cable at water freezing
in the steel microduct is higher than in polymeric and can lead to attenuation increase in the optical fiber. In the polymeric duct
loadings more low, than in the steel. However if a polymeric microduct freeze in ice, pressure upon a cable as can cause an
incrementation of attenuation.
The article presents the results of investigation regarding the optical fibre fastness to bending with permissible tensile
load and bending stiffness at the closure output depending upon the port sealing method of the fibre optic closure.
The article presents the results of cable reliability investigation, which takes place at laying out of technological margins,
cable flexure at optical closure output for critical conditions. A possibility to carry out the optical cabling with closures
in extreme conditions is shown. According to the investigation results we developed the recommendations on cabling
with two types of closures and high rigidity cables.
In article results of experimental researches of resistance to optical cable bends on an output from closure port are submitted. The test data optical cable with increased inflexibility in extreme conditions are resulted. Recommendations on increase of resistance to small radiuses bends for of optical cables on an output from closure at the lowered temperature are considered.
Optical cable jointing is one of the most important parts of the fiber optic telecommunication line installation. For
practical applications it is interesting to use some universal material kit for the sealing of the fiber optic closure ports
with various cables, differing by their types and manufactures, in addition to basic closure kit. Here a reasonable
question occurs: is it possible to develop universal instruction manuals for various combinations of optical cable and
universal fiber optic closures, based on closure kit and generalized additional kit, contenting the most conventional
sealing materials? It is obviously, technological tests are required to answer the mentioned question. Here, some results
of investigations are represented.