  We exploit the recent proposals for the light-induced superconductivity
mediated by a Bose-Einstein condensate of exciton-polaritons to design a
superconducting fiber that would enable long-distance transport of a
supercurrent at elevated temperatures. The proposed fiber consists of a
conventional core made of a silica glass with the first cladding layer formed
by a material sustaining dipole-polarised excitons with a binding energy
exceeding 25 meV. To be specific, we consider a perovskite cladding layer of 20
nm width. The second cladding layer is made of a conventional superconductor
such as aluminium. The fiber is covered by a conventional coating buffer and by
a plastic outer jacket. We argue that the critical temperature for a
superconducting phase transition in the second cladding layer may be strongly
enhanced due to the coupling of the superconductor to a bosonic condensate of
exciton-polaritons optically induced by the evanescent part of the guiding mode
confined in the core. The guided light mode would penetrate to the first
cladding layer and provide the strong exciton-photon coupling regime. We run
simulations that confirm the validity of the proposed concept. The fabrication
of superconducting fibers where a high-temperature superconductivity could be
controlled by light would enable passing superconducting currents over
extremely long distances.
