FIELD: fiber-optic communication lines. SUBSTANCE: fiber-optic light guide has core, light-guiding layer disposed onto surface of core and made with definite thickness and refractivity higher than refractivity of core, and protection envelope made in the form of metal film deposited onto light-guiding layer. Temperature expansion coefficient of film is equal to temperature expansion coefficient of core or is close to it. EFFECT: improved reliability of operation. 3 dwg
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