Method of encasing fusion spliced optical fibers in a casting.

摘要

In a method of preventing twisting of a fusion-spliced optical fiber in the process of encasing the optical fiber in a casing, one (162) of a pair of optical fibers (161, 162) is wound N turns in one direction to form a first coil. Another (161) of the pair of optical fibers is wound N turns in another direction opposite to the direction to form a second coil. Ends of remainder portions of the optical fibers which are not wound are fusion-spliced to each other to form a fusion-spliced portion (48). The fusion-spliced portion is fixed within a casing (14). The remainder portions of the optical fibers are pushed into the casing to expand the first and second coils. <IMAGE>