title: Characteristics of directional couplers with lapped multimode fibers.
abstract: Measurements of characteristics and a theoretical ray-optics analysis were made on directional couplers prepared by connecting a pair of lapped multimode fibers. Various measured characteristics such as branching ratio, excess insertion loss, and mode conversion agreed fairly well with calculated values. From these results a way was found to lessen the excess insertion loss and the branching ratio.
authors.forename: T
authors.initials: T
authors.lastname: Tanaka
authors.forename: H
authors.initials: H
authors.lastname: Serizawa
authors.forename: Y
authors.initials: Y
authors.lastname: Tsujimoto