Statistical design method of loss budget for the optical subscriber transmission system

Abstract

AbstractIn the transmission system for the trunk lines, where a high reliability, i.e., a severe loss requirement is imposed, the worst condition is usually assumed in the design for the individual gain and loss of the transmission devices and media. In this paper this method is called the worst‐case transmission loss budget method or the worst‐case design. Although this method is reliable, it often contradicts the economical requirement in the subscriber transmission system. This paper proposes a design method for the transmission system, called the statistical loss budget method or statistical design method. Here, the transmission characteristics of the devices and media are assumed to follow statistical distributions with certain ensembles, and assuming that included statistical phenomena are always independent, the transmission performance is secured at a certain level with the specified danger level (significance level). By the proposed statistical design method, the economical requirement can be satisfied while maintaining the overall transmission performance of the system. In the optical transmission system, where the transmission loss is less compared with the metallic system, it is a great advantage of the statistical design method that the transmission length can be increased. In the design example where the statistical method is applied to the design of an optical subscriber transmission system, the transmission length is increased to approximately 1.8 times compared with the worst‐case design.