Novel fire-resistant optical fiber cables with simple structure and stable loss performance

摘要

We have developed two types of fire-resistant optical-fiber cables. The first structure consists of stainless steel tubes, each containing an optical fiber, which is stranded around a tensile strength member and then jacketed with thermoplastic resin. The second structure consists of a stainless steel tube containing optical fibers and two tensile strength members, which are laid parallel to each other and then jacketed with thermoplastic resin (This cable structure allows for single-process manufacture). We have performed a variety of evaluations (on optical transmission loss characteristics, mechanical characteristics, and fire-resistance characteristics) on the first and second cable structures mentioned above, and have confirmed that these cables possess excellent characteristics.