The article analyzes possible options for solving the problem of finding the laying route and localizing damage locations for all-dielectric optical cables and transport multichannel communication of fiber-optic communication lines. Based on the analysis, two most promising methods were identified. This is the use of electronic marking systems and acoustic monitoring systems using cable optical fibers as a distributed acoustic sensor. Practical recommendations for the implementation of the proposed methods are given.
The article analyzes the design experience line-cable structures of transport multichannel communication. It is shown that in Russia the current guidelines cannot be applied to new technologies; therefore, it is necessary to develop recommendations for the design of line-cable structures of transport multichannel communication.
The testing ground based on the different technologies of optical cable installation is described in paper. The testing ground consist from communication lines based on microduct system and using direct underground installation. The comparison of different methods for cable trace location was performed. The experimental approbation of electromagnetic induction method, ground penetrating radar method and acoustic method was carried out on the testing ground.
The article presents a comparative analysis of the reliability characteristics of fiber-optic communication lines in the application of underground laying of optical cable, mini-trench installation technique and cable in the outer protective duct. It is shown that the availability factor of underground laying armored optical is less than that of cables laid in the, outer protective duct and in microduct in the mini-trench.
During installation of aerial optical fiber cables in regions with low temperatures the critical bends at the outlet from port of the closure are occures. Bending radiuses define the loads of an optical cable at installation of optical closures. In this paper influences of external factors (change of bending radius of an optical cable at the outlet from the closure port and residual deformations of a jacket) on quality of aerial optical cables installation at low temperatures are considered.
KEYWORDS: Optical fibers, Copper, Signal attenuation, Resistance, Optical communications, Telecommunications, Temperature metrology, Manufacturing, Optical fiber cables, Chemical elements
Communication cables in general and combined in particular, applied on objects of technological communication of gas, oil, processing industry and also on objects of other industries should have high reliability and resistance to mechanical loadings. This work the resistance of optical fibers and copper conductors of the combined cable to influence of the tensile and crushing loadings and also stiffness of a cable which arise at their installation is considered.
This paper presents an analysis of the data measurements of excess fiber length in the loose tubes of optical cable during the post-process quality control of ready-made products. At determining estimates of numerical characteristics of excess fiber length method of results processing of direct multiple equally accurate measurements has been used. The results of experimental research of the excess length value at the manufacturing technology of loose tube remains constant.
Research of variability excess fiber length in loose tube and in cable delivery length during manufacture of optical cable are analyzed in this paper. The excess fiber length measurements on the same optical fibers after some operations of optical cable fabrication and the analysis results of this data are introduced.
The main optical and electric characteristics of the combined cable with optical fibers and copper conductors for
installation along the railways are considered. The cable design is described. Results of tests the cables ability to
mechanical loadings and results of measurement of PMD are given. It is shown that the manufacturing techniques of the
combined cable do not make considerable change of optical and electric characteristics of optical fibers and conductors
in a cable.
Hard electro-magnetic (EM) impulse influence over optical cables is considered. This problem is typical for optical cables with metallic constructive elements. In such cables there can be electrodynamic destruction factors. EM influence sources, means and mechanisms are considered. The necessity of optical cable (OC) EM safety technical inspection on fiber-optic transmission line (FOTL) linear-cable construction is shown. The choice of analytical methods of EM conditions and complex appraisal ofconnection objects EM compatibility is done.
It has been shown that fiber-optic transmission line (FOTL) quality and reliability are mostly determined with the firmness of optic cable (OC) with metallic elements against outward electro-magnetic (EM) influence. The most important questions are quality control ofprojection and construction ofFOTL linear-cable structure, and also realization of prophylactic work at FOTL exploitation stage. The questions of OC external covers characteristics control and condition control ofFOTL linear-cable construction system ofprotection from lightning and EM influence are shown.
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