High-Speed Tensile Testing of Optical Fibers— New Understanding for Reliability Prediction

Сценарии Прогноза Срока Службы Оптического Волокна В Клс

“…где S 0 -исходная прочность оптического волокна в начале испытаний. Следует отметить, что в настоящее время, как правило, используют более корректную двустадийную модель разрушения оптических волокон из кварцевого стекла [12,13]. Однако, поскольку первая стадия может длиться годами, а вторая протекает за доли секунды, то при анализе срока службы ОВ в кабеле можно ограничиться только первой стадией, воспользовавшись формулой [12]:…”

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.…”

Algorithm for predictive control implementation on fiber optic transmission lines

“…We propose a method for forecasting the life of optical fibers as measured by local reflections on defects of fiber cladding 3 . It is based on the analysis of local coefficients change over time, the relationship model of the geometric characteristics of microcracks and local reflection coefficient empirical formula relationship quartz fiber strength and geometric characteristics of microcracks and static fracture model quartz fibers.…”