UNDERWATER BRANCHING UNIT OF OPTICAL ADD/DROP MULTIPLEXER, CORRESPONDING OPTICAL TRANSMISSION METHOD AND SYSTEM THEREOF

摘要

Embodiments of the present invention provide an Optical Add-Drop Multiplexer (OADM) Branching Unit (BU) and the corresponding optical transmission method and system. The method includes: separating a part of optical signals of different wavelengths from two trunk fibers respectively, coupling the part of optical signals of different wavelengths, and transmitting the coupled optical signals to a branch station through a fiber; separating, according to wavelengths, optical signals that have different wavelengths and are transmitted by the branch station through a fiber, and then transmitting the optical signals to the two trunk fibers respectively; separating null-compensation light from the optical service signals transmitted through a fiber by the branch station to obtain the null-compensation light; coupling the null-compensation light with the part of optical signals that have different wavelengths and are respectively separated from the two trunk fibers, and transmitting the coupled optical signals to the branch station through a fiber.