Effect of Below-Freezing Temperature on Optical Loss of Polyimide-Coated Optical Fibers
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An increase in the optical loss in polyimide-coated optical fibers, caused by microbendings is detected at temperatures below -25 °C. It is shown that the observed increase in the optical loss is due to the presence of a residual N-methyl-2-pyrrolidone solvent in the polyimide coating.
Keywordsoptical fiber polyimide varnish protective-strengthening coating
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This study was supported by the Ministry of Education and Science of the Russian Federation, project no. RFMEFI60417X0183.