Abstract: The junction between two optical fiber light conductors is protected by a sleeve envelope which connects the protection coatings directly to each other. Tension resistent filler fibers are compressed by a shrink fit inside the sleeve envelope so that tension stress bypasses the light conductor fibers through the filler fibers. The sleeve envelope ends are shrink fitted to the protection coating. The highly tension resistant filler fibers, surrounding and bridging the junction, are tightly enclosed in the sleeve envelope by the shrink fit so that tension stress also passes through the filler fibers, thereby permitting the sleeve envelope to perform its protection function while the filler fibers provide the required strength.