Design of plant expansion in subscriber optical fiber cable network

Abstract

AbstractThis paper considers the low‐cost trends of optical fiber cables and the measures for coping with the widely scattered demands thatare regarded as special features in the initial stage of the formation of a subscriber optical fiber cable network. A method for economical construction of an optical cable network is discussed. First, the low‐cost trends of the optical fiber cables are dynamically grasped and a method is clarified for designing installation intervals and the sizes of the cables which will make the present annual expense worth a minimum by using dynamic programming. Next, for cable construction systems connecting the local office and the plural distribution areas, three systems, the fiber‐reduction system, fiber‐nonreduction system, and independent cable system, are considered and the applicable domains of these systems are clarified from the economical viewpoint with the installation cable size and distribution area as parameters. Moreover, a method is obtained for simultaneous design of the cable construction system which will minimize the total cost, and the distribution area size is shown for a given installation cable size. It is clarified from these results that it is more economical to use a shorter installation interval in the initial stage of the formation of the subscriber optical cable network than the present subscriber cable network using the symmetrical pair cables. Also, it is desirable to set a wide distribution area consolidating two to four present fixed distribution areas.