Abstract: An optical fiber cable of the type comprising a fiber (3) having a central core and a surrounding cladding and made for transmitting optical high-power, specifically power exceeding 1 kW. At least one of the fiber ends is provided with cooling means for optical power loss comprising a cavity with a flowing coolant (2) surrounding the envelope surface of the fiber end. Incident radiation that falls outside the fiber comes into the coolant, preferably a liquid coolant such as water, where it is at least partially absorbed. At least one of the limiting wall surfaces of the cavity is completely or partially non-absorbing for the incident radiation, while the other limiting wall surfaces are arranged to absorb such radiaton that is still present and transmitted through the flowing coolant (2). As these surfaces are in direct contact with the coolant an efficient cooling is obtained.

Abstract: An optical fiber cable for high power laser radiation transmission comprises a fiber having a core and a surrounding cladding, a rod provided at at least one of contact ends of the core and fused to an end surface of the core the rod having larger diameter than that of the core, and a reflector provided at this end of the fiber, the rod being designed to conduct rays entering outside the fiber towards an area where they can be absorbed without causing any damage, to conduct rays not linked into the fiber towards the reflector.