<title>Strategy choice for fiber optic transmission lines maintenance</title>

Abstract

The article presents the strategy analysis for technical operation of fiber optic transmission lines. Besides, the article deals with maintenance strategies of telecommunication optical cables; it formulates the problems of maintenance improvement in fiber optic transmission lines and methods for their solution.

Investigation of mechanical stress applied to the optical modular cables at low temperatures

“…6) shows the dependence of the bending radius optical fiber from twisting step. Analysis of the graphs (Figure 7,8) shows that by increasing the inner diameter of the modulus increasing bending radius optical fiber occurs only up to a certain value, then a decrease R. By (5)(6)(7)(8)(9)(10)(11) were calculated losses optical fiber when the temperature changes. Figure 9,10 shows plots of the loss modulus of the fibers caused by changes in the bending radius optical fiber at lower paceture.…”

“…By (8)(9)(10)(11) for the boundary of the step twist optical fiber is P = 20 mm and p = 100 mm were calculated bending radius optical fiber for the three most commonly used sizes of modules (Table. 2). Below in Figure 4,5 shows plots of the average bending radius optical fiber in modules cable, depending on the temperature.…”

“…It is known that the increase in attenuation in optical fibers modular cables at low temperatures due to the decrease of negative bending radii of the fibers in the modular tubes [1,[10][11][12][13]. Accordingly, for the prediction of changes in the damping of optical fibers must evaluate changes radii fibers and calculate the bending loss.…”

Problems of reliability of optical cables at low temperatures

“…If to assume that one full-year cycle it conditionally two seasons -a season positive and a season of negative temperatures which are characterized by some average value of stress in optical fiber, then from (2) follows a formula: 4. The analysis showed that in the calculation of the optical cable lifetime is sufficient to consider only the first stage fiber failure [13][14][15][16][17][18][19][20][21] . Then, formula (3) and the condition of failure fibers: …”

“…The lifetime of the optical fibers is determined by stress corrosion process and depends from the mechanical stress in the optical fiber [1][2][3][4][5][6][7] . Researches of deformations of optical cables at the low temperatures showed that residual radial deformations of optical cables loose tubes can be the cause [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] . Such deformations can be the cause of optical fibers stress at low negative temperatures and the cause of optical cables reliability decrease at fiber optical communication lines maintenance.…”