Affiliations: [a] Saint Petersburg National Research University of Information Technologies, Mechanics and Optics (ITMO University), 197101, Saint-Petersburg, Russia. E-mail: [email protected] | [b] JSC “Research and Technological Institute of Optical Materials All-Russia Scientific Center “S.I. Vavilov State Optical Institute”, 192171, Saint-Petersburg, Russia. E-mail: [email protected] | [c] Perm National Research Polytechnic University, 614990, Perm, Russia. E-mail: [email protected]
Abstract: It is established that silica optical fibers (SOF) strength increases twice as environment moisture decrease down to water vapors pressure of 10−2Pa. Further decrease of moisture doesn’t influence their strength. Highly-stressed SOF fracture periods of up to 10−3sec have been found to be controlled by water vapor pressure. SOF treatment by HCl solution increases their strength by 7% and their static fatigue 10 times.