Fiber for optical communications

A fiber for optical communication comprising a low-loss optical fiber core for optical communication, said core being covered with at least one coating layer of a polylaurolactam copolymer, said copolymer consisting essentially of 20 to 98 parts by weight of laurolactam and 80 to 2 parts by weight of one or more polyamide-forming monomers different from laurolactam, said polyamide-forming monomers being selected from the group consisting of lactams having 4 to 16 carbon atoms, amino carboxylic acids having 4 to 16 carbon atoms and salts of alkylene (C.sub.4 -C.sub.16) diamines and alkylene (C.sub.4 -C.sub.16) dicarboxylic acids, said copolymer having a melting point within the range of 100.degree. C. to 170.degree. C.