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.
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.
In this paper the analysis of exceed fiber length distribution in loose tube cable and its relation with mechanical stress was carried out. The polarization reflectometry method for estimation of exceed fiber length distribution along cable during manufacturing and maintenance was proposed. The method of measurement local birefringence using polarization optical time domain reflectometer with three stage polarization controller was proposed. Results of computer stimulation are represented.
In work results of the survey conducted among professional fiber optic technicians and engineers concerned with skills in fiber optic link testing and measurement are presented. Head count was provided on the basis of the Samara Regional Telecommunication Training Centre (SRTTC) of the Povolzhskiy State University of Telecommunications and Informatics (PSUTI) during the period from February to April, 2017. The developed survey included a set of the questions allowing to estimate an work length and qualification of the engineer, his practical skills, the main activity field, typical work volume on measurements and results processing and, respectively, obligatory and optional actions for grouping, marking, structuring and hosting of the database on this or that trace of the elementary cable section of fiber optic transmission links. More than 40 employees of communication industry, business units of the big companies and also the separate enterprises of medium and small business carry on installation and maintenance of fiber optic transmission links have participated in survey. At the same time part of them have been defective, proceeding from the revealed unacceptably low skill level and/or short work length. The analysis of the received survey results have allowed to establish the corresponding subsections of course programs in the "Measurements on Fiber Optic Transmission Links" demanding, at least, enhanced studying, and in some cases – modifications and carrying out an additional lecture practical training.
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.
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
polymer tube.
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.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.