Abstract: The guide pin (P) in accordance with the present invention is a guide pin (P) having a predetermined pin diameter to be inserted into a guide pin insertion hole (9) of a ferrule (11); which is configured to have an inserting portion (31) penetrating through the ferrule (11), and an engagement portion (32), having a diameter greater than that of the guide pin insertion hole (9), adapted to abut against the back face (11b) of the ferrule (11).

Abstract: An optical fiber connector at least comprising an optical fiber ferrule capable of fixing an optical fiber, and an optical fiber fixed in the optical fiber ferrule, a pair of the optical fiber connectors being used such that their respective end faces are opposed to each other to connect the optical fibers; wherein the core portion at the end of the optical fiber is recessed inwardly of the end face of the cladding, and the end face of the optical fiber is recessed inwardly of the end face of the ferrule; whereby reduction in variations is achieved in connection loss occurring depending on whether PC coupling takes place or not, and variations in connection loss associated with multiple reflection.

Abstract: An optical connector ferrule for use in an optical coupling of optical fibers includes an insertion member, the insertion member comprising a guide capillary for positioning said optical fibers, which comprises a flat plate and a guide substrate having optical fiber guide grooves in one surface thereof, said flat plate being bounded to said guide substrate to form optical fiber guide holes into which said optical fibers are inserted; a reinforcing pipe for surrounding said guid capillary; and a resin-molded area provided between said guide capillary and said reinforcing pipe for insert-molding said guide capillary within said reinforcing pipe.