FIELD: fiber optics.;SUBSTANCE: invention relates to fiber optics. Fiber includes a core and a reflective sheath of quartz glass coated with a tin coating. Tin coating is modified by bismuth in proportion Bi100-xSnx, where x=99.5±0.05 wt. %. Thickness of the stabilized tin coating is preferably from 20 to 60 microns for an optical fiber with a diameter of 125 to 480 microns and from 40 to 80 microns for an optical fiber with a diameter of 500 to 1,200 microns.;EFFECT: production of optical fiber with durable tin-free coating without major defects, capable of long-term operation in various temperature conditions in a wide range from -50 to +200 °C.;3 cl, 3 ex
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机译：光纤技术领域本发明涉及光纤。纤维包括石英玻璃芯和涂有锡涂层的反射皮。锡以Bi 100-x Sn x 的比例被铋改性，其中x = 99.5±0.05 wt.。 ％。对于直径为125至480微米的光纤，稳定锡涂层的厚度优选为20至60微米，对于直径为500至1200微米的光纤，稳定锡涂层的厚度优选为40至80微米。纤维具有耐用的无锡涂层，没有重大缺陷，能够在-50至+ 200°C的各种温度条件下长期运行; 3 cl，3 ex
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