Single-Mode W-Type Optical Fiber Stable Against Bending and Radiation
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Single-Mode W-Type Optical Fiber Stable Against Bending and Radiation M. A. Eron’yana,*, A. Yu. Kulesha, A. A. Reutskiia, D. R. Devet’yarova, I. S. Nikitina, A. A. Untilova, D. V. Volynskiia, I. A. Ovchinnikovab, Yu. K. Chamorovskiic, and A. A. Pechenkind a State b
Research Center of the Russian Federation Concern CSRI Elektropribor, JSC, St. Petersburg, 197046 Russia All-Russia Scientific Research, Design, and Technological Institute of Cable Industry, Moscow, 111024 Russia c Kotel’nikov Institute of Radio Engineering and Electronics (Fryazino Branch), Russian Academy of Sciences, Fryazino, Moscow oblast, 141190 Russia d National Research Nuclear University MEPhI, Moscow, 115409 Russia *e-mail: [email protected] Received February 15, 2020; revised April 20, 2020; accepted April 20, 2020
Abstract—It is shown that single-mode fluorosilicate optical fibers fabricated with the aid of modified chemical vapor deposition exhibit a significant decrease in the radiation resistance when 1 mol % GeO2 is introduced into the silica-glass core. Elimination of chlorine and OH group impurities in the silica glass of the core of the fluorosilicate single-mode fiber leads to a relatively low level of radiation-induced attenuation. Prior to radiation processing, the loss factors of optical fiber are 0.18 and 0.3 dB/km at wavelengths of 1.55 and 1.31 μm, respectively. The dependence of optical loss of such fibers on the bend diameter ranging from 6 to 12 mm is studied. DOI: 10.1134/S1063784220120087
INTRODUCTION Radiation-resistant optical fibers (RROFs) designed for operation in the presence of increased background radiation and extremely low temperatures are needed for several important applications, primarily, for space technology. The Institutes of the Russian Academy of Sciences are developing such optical fibers (OFs) with the aid of the modified chemical vapor deposition (MCVD), which is a universal but not the most efficient method [1]. The RROF core consists of pure silica glass, and the cladding is made of fluorosilicate glass [2–4]. Such fibers are called W-type fibers due to multistep radial profile of the refractive index (RI). As distinct from conventional step-index OFs, the W-type fibers exhibit leakage of radiation to the external cladding the RI of which is greater than the RI of fluorosilicate cladding. For complete elimination of such an effect, the diameter of the fluorosilicate cladding of single-mode OFs must be greater than the diameter of the silica-glass core by a factor of no less than 8 [5]. An insignificant increase in the core RI due to doping with GeO2 makes it possible to decrease the factor to 6 [6], which allows a significant (by 70%) decrease in the duration of the deposition of cladding. The expediency of the presence of germanium oxide in the RROF core has been shown in [7]: a higher radiation resistance of the germanosilicate OF in comparison with the fluorosilicate OFs has been demon-
strated. Further experiments have proven high radiation resistance of multimode germanosilicate OFs [8, 9
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