Optical cable design and characterization in Japan

Discussion is made on physical parameters of graded-index fiber, design of coated fiber, design concept of optical cables including various types of cables developed in Japan. Optimum design of the fiber physical parameters is described from the viewpoints of fiber properties and cost. The basic approach to fiber buffering and coating is discussed in consideration of the preservation of transmission characteristics, mechanical properties, and reliability in a long term. The design concept of fiber cables is summarized. Various types of fiber cables fabricated in Japan are introduced.