Abstract: A cryogenic system cools and operates cryogenic electronics. The cryogenic system includes a cryogenic stage or multiple cryogenic stages for cooling the cryogenic electronics to an operational cryogenic temperature. The cryogenic stage or stages transfer heat from the cryogenic electronics to an ambient environment. An optical fiber or multiple optical fibers deliver an operational power from the ambient environment to the cryogenic electronics and transfer communication data between the cryogenic electronics and the ambient environment. Preferably, the only connection delivering any power from the ambient environment to the cryogenic electronics or transferring any data from the cryogenic electronics to the ambient environment is the optical fiber or fibers, such that the cryogenic system does not include any electrically conductive wires spanning between the ambient environment and the cryogenic electronics.